JP2006030400A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which can simplify the mechanism of the positioning device to adjust the positions of the light modulating device. <P>SOLUTION: The projector has a focus adjusting device 4402 having a fluid vessel R to fill the fluid arranged in the light path between the light modulating device 441 and the projection optical device. The focus adjusting device 4402 is configured so as to change the capacity of the fluid vessel R, and changes the light path length of light flux passing the fluid filled in the fluid vessel R, and positions the light modulating device 441 at the back focusing position of the projection optical device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector.

Conventionally, three light modulation devices that modulate three color lights of R, G, and B according to image information for each color light, a color combining optical device that combines three modulated light beams to form image light, and formation A projector including a projection optical device that magnifies and projects the image light thus produced is known.
In such a projector, each light modulation device must be at the back focus position of the projection optical device. In addition, in order to obtain a clearer image, it is necessary to prevent occurrence of pixel shift between the light modulation devices and distance shift from the projection optical device.
For this reason, at the time of manufacturing the projector, focus adjustment for accurately arranging each light modulation device at the back focus position of the projection optical device and alignment adjustment for matching the pixels of each light modulation device are performed with high accuracy. And the position adjustment apparatus which implements such position adjustment is proposed (for example, refer patent document 1).
In this position adjusting device, a plane position adjusting unit, an in-plane rotating position adjusting unit, an out-of-plane rotating position adjusting unit, and a liquid crystal panel holding unit are integrally configured. The planar position adjustment unit modulates the light modulation held by the liquid crystal panel holding unit when the optical axis direction of the light beam incident on the light modulation device is the Z axis and the two axes orthogonal to the X axis are the X and Y axes. The position of the apparatus is adjusted in each of the X-axis direction, the Y-axis direction, and the Z-axis direction. The out-of-plane rotation position adjustment unit moves the light modulation device held by the liquid crystal panel holding unit in a rotation direction around the X axis (Xθ direction) and a rotation direction around the Y axis (Yθ direction). Adjust each position. Further, the in-plane rotation position adjustment unit adjusts the position of the light modulation device held by the liquid crystal panel holding unit in the rotation direction (θ direction) about the Z axis.

Japanese Patent Laying-Open No. 2003-107395 (FIG. 6)

However, in the position adjustment device described in Patent Document 1, the planar position adjustment unit, the in-plane rotation position adjustment unit, the out-of-plane rotation position adjustment unit, and the liquid crystal panel holding unit are integrally configured. The structure of the device becomes complicated. For this reason, the manufacturing cost of the position adjusting device increases, and the position adjusting device increases in size.
In view of the above, there is a demand for the establishment of a position adjustment structure for an optical modulation device that can simplify the structure of the position adjustment apparatus.

  The objective of this invention is providing the projector which can simplify the structure of the position adjustment apparatus for implementing position adjustment of a light modulation apparatus.

A projector according to the present invention includes a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, and a projection optical device that enlarges and projects the light beam modulated by the light modulation device. A projector including a focus adjustment device that is disposed in an optical path between the light modulation device and the projection optical device and has a fluid enclosure chamber that can enclose a fluid therein, and the focus adjustment device Is configured such that the volume of the fluid enclosure chamber can be changed, the optical path length of a light beam passing through the fluid enclosed in the fluid enclosure chamber is changed, and the light modulation device is placed at a back focus position of the projection optical device. It is characterized by positioning.
According to the present invention, since the projector includes the focus adjusting device, the volume of the fluid enclosure chamber is changed to change the thickness dimension of the fluid enclosed in the fluid enclosure chamber (the thickness dimension of the light beam in the optical axis direction). Thus, the optical path length of the light beam passing through the fluid can be changed. Thus, by changing the volume of the fluid sealing chamber in the focus adjustment device, the light modulation device can be positioned at the back focus position of the projection optical device without directly moving the light modulation device. Therefore, in the conventional position adjusting device, the structure in which the light modulation device is moved in the Z-axis direction, the structure in which the light modulation device is moved in the rotation direction (Xθ direction) around the X axis, and the rotation direction (Yθ in the center around the Y axis). The structure that moves in the direction) can be omitted, and the structure of the position adjusting device can be simplified. Therefore, the cost and size of the position adjusting device can be reduced.

  In the projector according to the aspect of the invention, the focus adjustment device may include a first frame-shaped member and a second frame-shaped member that each have an opening that allows the light beam to pass therethrough, and are opposed to each other, the first frame-shaped member, and the first frame-shaped member. A pair of translucent substrates that respectively close the openings of the two frame-shaped members, and a screwing member that connects the first frame-shaped member and the second frame-shaped member, A plate-shaped first plate body having a hole through which the screwing member can be inserted and the opening, and an end surface facing the second frame-shaped member in the first plate body, the opening being planarly formed. A first projecting portion that surrounds the second frame-shaped member, and the second frame-shaped member includes a plate-shaped second plate body having a hole and the opening through which the screwing member can be inserted, and the second plate body. Projecting on an end face facing the first frame-shaped member, the opening is planarly surrounded. And a second projecting portion that can be fitted into the first projecting portion, and the fluid sealing chamber has the first frame-shaped member and the opening of the second frame-shaped member as the pair of light-transmitting members. And is formed between the first frame-like member and the second frame-like member by fitting the first projecting portion and the second projecting portion. The first frame member and the second frame member are screwed into at least one of the holes of the first frame member and the second frame member, and the screwed state with the hole is changed. It is preferable to change the volume of the fluid sealing chamber by changing the relative position of the frame member.

Here, a screw member can be adopted as the screwing member. Moreover, the following structures can be employ | adopted as a structure where a screwing member connects a 1st frame-shaped member and a 2nd frame-shaped member.
For example, the screwing member is screwed into each hole of the first frame-like member and the second frame-like member. At this time, different screwing structures such as a right-handed screwing structure and a left-handing screwing structure are used as the screwing structure with each hole. If comprised in this way, by operating a screwing member and changing a screwing state with each hole, the advancing / retreating movement direction of a 1st frame-shaped member and a 2nd frame-shaped member will become a reverse direction, and a 1st frame The relative positions of the member and the second frame member are changed.
Further, for example, the screwing member is screwed with the hole of the first frame-like member. If comprised in this way, if a screwing member is operated and the screwing state with the said hole is changed, a screwing member will move forward / backward with respect to a 1st frame-shaped member. Here, the threaded member and the second frame-shaped member are moved so that the second frame-shaped member is also moved forward / backward with the forward / backward movement of the threaded member in a state where the threaded member is inserted into the hole of the second frame-shaped member. Is connected, the relative positions of the first frame-like member and the second frame-like member are changed by operating the screwing member to change the screwing state with the hole.

According to the present invention, the focus adjustment device is composed of the first frame-shaped member, the second frame-shaped member, the pair of translucent substrates, and the screwing member. Compared to the structure used, the structure can be simplified and the manufacturing cost can be reduced.
Further, the volume of the fluid sealing chamber can be easily changed by operating the screwing member, and the light modulation device can be easily positioned at the back focus position of the projection lens.

In the projector according to the aspect of the invention, it is preferable that the screwing member includes at least three screw members.
According to the present invention, since the screwing member is composed of at least three screw members, by operating each of the at least three screw members, for example, the optical axis of the second frame member with respect to the first frame member The forward / backward movement of the direction and the change of the tilt state with respect to the plane orthogonal to the optical axis can be favorably implemented. For this reason, the thickness of the fluid in the fluid enclosure chamber in the optical axis direction is changed in a uniform state in a direction orthogonal to the optical axis direction, or is changed continuously in a direction orthogonal to the optical axis direction. And the light modulation device can be easily and satisfactorily positioned at the back focus position of the projection optical device.

In the projector according to the aspect of the invention, it is preferable that the first frame member is fixed to a predetermined position inside the projector on the light beam incident side with respect to the second frame member, and supports the light modulation device.
According to the present invention, since the first frame-shaped member supports the light modulation device, the focus adjustment device and the light modulation device can be integrated, and the projector can be miniaturized.
Further, a member for installing the focus adjustment device inside the projector and a member for installing the light modulation device inside the projector can be made common, and the cost of the projector can be reduced and the size can be reduced because the member is omitted.
By the way, conventionally, as the support structure of the light modulation device, the following support structure has been adopted in order to move the light modulation device by the position adjusting device and fix it at the optimum position.
The light modulation device is formed with a plurality of through holes penetrating in the optical axis direction. Then, pin spacers each coated with an adhesive are inserted into the plurality of through holes, and one end of the pin spacer is brought into contact with a support member that supports the light modulation device. Then, by adjusting the focus of the light modulation device with the position adjustment device, the through hole of the light modulation device slides on the outer periphery of the pin spacer. Then, after performing the focus adjustment of the light modulation device, the adhesive is cured to fix the light modulation device to the support member. Therefore, a support structure that supports the light modulation device with a plurality of pin spacers is employed. In such a configuration, the adhesion state is easily released by an external force, and it is difficult to satisfactorily position the light modulation device at the back focus position of the projection lens.
In the present embodiment, since the focus adjustment can be performed without moving the light modulation device directly by changing the volume of the fluid sealing chamber, the support structure of the light modulation device in the first frame member is, for example, a screw or the like. A supporting structure for fixing the light modulation device to the first frame member can be employed. In such a configuration, the light modulation device can be satisfactorily positioned at the back focus position of the projection lens without causing a positional shift of the light modulation device due to an external force.

In the projector according to the aspect of the invention, a plurality of the light modulation devices are provided, and a plurality of the focus adjustment devices are provided corresponding to the plurality of light modulation devices, and each of the light beams modulated by the plurality of light modulation devices is provided. A color combining optical device for combining; the first frame-shaped member is disposed on a light beam incident side with respect to the second frame-shaped member, and protrudes from an edge of the first plate body toward a light beam emitting side; An attachment portion for attaching to the light beam incident side end face of the color synthesis optical device is provided, and the plurality of light modulation devices are respectively supported by the first frame members of the plurality of focus adjustment devices, and the plurality of focus adjustments It is preferable that the plurality of light beam incident side end faces of the color synthesizing optical device are respectively fixed through the device.
According to the present invention, the projector includes the color combining optical device. The plurality of focus adjusting devices are respectively attached to the plurality of light beam incident side end faces of the color synthesizing optical device via attachment portions of the first plate member of the first frame member. In addition, the plurality of light modulation devices are supported by the respective first frame members that constitute the plurality of focus adjustment devices. As a result, by integrating a plurality of light modulation devices, a plurality of focus adjustment devices, and a color synthesis optical device, the projector does not increase in size even when a plurality of light modulation devices are provided.
Moreover, as a support structure of the light modulation device in the first frame-shaped member, as described above, for example, a support structure in which the light modulation device is fixed to the first frame-shaped member with a screw or the like can be employed. Therefore, the optical modulators are not displaced by external force, and the mutual positions of the plurality of optical modulators can be maintained well, and a good optical image free from pixel shift can be formed.

In the projector according to the aspect of the invention, it is preferable that the first frame member is made of a heat conductive material and supports the light modulation device so that heat can be transferred.
According to the present invention, the heat generated in the light modulation device by the light beam emitted from the light source device can be dissipated by following the heat transfer path of the fluid in the light modulation device, the first frame-shaped member, and the fluid-filled chamber. It is possible to improve the cooling efficiency of the modulation device and prevent thermal degradation of the light modulation device. For this reason, the lifetime of the projector can be extended.

In the projector according to the aspect of the invention, the focus adjustment device includes an inflow port through which a fluid flows into the fluid enclosure chamber and an outflow port through which the fluid in the fluid enclosure chamber flows out to the outside. It is preferable to include a plurality of fluid circulation members that are connected to the inlet and the outlet, guide the fluid to the outside of the fluid enclosure chamber, and guide the fluid to the inside of the fluid enclosure chamber again.
According to the present invention, since the projector includes a plurality of fluid circulation members, the fluid in the fluid enclosure chamber of the focus adjustment device can be convected, and the temperature difference between the light modulation device and the fluid can be maintained well. The cooling efficiency of the light modulation device can be further improved.

In the projector according to the aspect of the invention, the projector includes at least one optical conversion element that is disposed in an optical path between the light modulation device and the projection optical device and converts an optical characteristic of an incident light beam. A translucent substrate and an optical conversion film that is formed on the translucent substrate and converts an optical characteristic of an incident light beam, and at least one of the pair of translucent substrates constituting the focus adjustment device Such a translucent substrate is preferably a translucent substrate constituting the optical conversion element.
Here, as the optical conversion element, for example, an exit side polarizing plate, a phase difference plate, a viewing angle correction plate, or the like can be adopted.
According to the present invention, since at least one of the pair of translucent substrates constituting the focus adjustment device is a translucent substrate constituting the optical conversion element, it is emitted from the light source device. The heat generated in the optical conversion film by the light flux can be dissipated by following the heat transfer path of the fluid in the optical conversion film, the translucent substrate, and the fluid-filled chamber, improving the cooling efficiency of the optical conversion element, and Thermal deterioration can be prevented. For this reason, the lifetime of the projector can be extended.
Further, a member for installing the optical conversion element inside the projector can be omitted, and the cost and size of the projector can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[1. Projector configuration)
FIG. 1 is a diagram schematically showing a schematic configuration of the projector 1.
The projector 1 modulates a light beam emitted from a light source according to image information to form an optical image, and enlarges and projects the formed optical image on a screen. The projector 1 includes an exterior case 2, a cooling unit 3, and an optical unit 4.
Although not shown in FIG. 1, a power supply block, a lamp drive circuit, and the like are arranged in a space other than the cooling unit 3 and the optical unit 4 in the exterior case 2.

The exterior case 2 is made of synthetic resin or the like, and is formed in a substantially rectangular parallelepiped shape that accommodates and arranges the cooling unit 3 and the optical unit 4 therein. Although not shown, the exterior case 2 includes an upper case that configures the top, front, back, and side surfaces of the projector 1, and a lower case that configures the bottom, front, side, and back surfaces of the projector 1, respectively. The upper case and the lower case are fixed to each other with screws or the like.
The exterior case 2 is not limited to being made of synthetic resin, but may be formed of other materials, for example, metal.
Although not shown in detail, the exterior case 2 is heated by the cooling unit 3 through the air inlet 2A (see FIG. 2) for introducing cooling air from the outside of the projector 1 and inside the projector 1. An exhaust port for discharging the generated air is formed.
Further, as shown in FIG. 1, the exterior case 2 is positioned at a corner portion of the exterior case 2 on the side of a projection lens, which will be described later, of the optical unit 4. A partition wall 21 is formed to be isolated from the member.

The cooling unit 3 sends cooling air into a cooling flow path formed inside the projector 1 to cool heat generated in the projector 1. The cooling unit 3 is located on the side of a projection lens, which will be described later, of the optical unit 4, and cooling air outside the projector 1 is introduced into the interior from an air inlet (not shown) formed in the exterior case 2. The sirocco fan 31 that blows cooling air to the liquid crystal panel of the optical device and the partition wall 21 formed in the outer case 2 are located outside the projector 1 from the air inlet 2A (see FIG. 2) formed in the outer case 2. An axial fan 32 is provided as a cooling fan that introduces cooling air and blows cooling air to a later-described radiator of the optical unit 4.
Although not shown, the cooling unit 3 is a cooling unit for cooling a sirocco fan 31 and an axial fan 32, a light source device (to be described later) of the optical unit 4, a power supply block (not shown), a lamp driving circuit, and the like. It shall also have a fan.

  The optical unit 4 is a unit that optically processes a light beam emitted from a light source, forms an optical image (color image) corresponding to image information, and magnifies and projects it on a screen (not shown). As shown in FIG. 1, the optical unit 4 has a substantially L shape in plan view that extends along the back surface of the outer case 2 and extends along the side surface of the outer case 2. The detailed configuration of the optical unit 4 will be described later.

[2. Detailed configuration of the optical unit)
As shown in FIG. 1, the optical unit 4 includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an optical device 44, a projection lens 45 as a projection optical device, and these optical components. 41 to 43, 45, and an optical component housing 46 that arranges an optical device main body, which will be described later, of the optical device 44 at a predetermined position.
The integrator illumination optical system 41 is an optical system for illuminating an image forming area of a liquid crystal panel, which will be described later, constituting the optical device 44 substantially uniformly. As shown in FIG. 1, the integrator illumination optical system 41 includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415.

The light source device 411 includes a light source lamp 416 that emits a radial light beam and a reflector 417 that reflects the emitted light emitted from the light source lamp 416. As the light source lamp 416, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is frequently used. In FIG. 1, a parabolic mirror is used as the reflector 417. However, the reflector 417 is not limited to this, and the reflector 417 is configured by an elliptical mirror, and a light beam reflected by the elliptical mirror on the light beam emission side is converted into parallel light. It is good also as a structure which employ | adopted the collimated concave lens as follows.
The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source device 411 into a plurality of partial light beams.
The second lens array 413 has substantially the same configuration as the first lens array 412, and has a configuration in which small lenses are arranged in a matrix. The second lens array 413 has a function of forming an image of each small lens of the first lens array 412 on a liquid crystal panel (to be described later) of the optical device 44 together with the superimposing lens 415.

The polarization conversion element 414 is disposed between the second lens array 413 and the superimposing lens 415, and converts light from the second lens array 413 into substantially one type of polarized light.
Specifically, each partial light converted into substantially one type of polarized light by the polarization conversion element 414 is finally substantially superimposed on a liquid crystal panel (described later) of the optical device 44 by the superimposing lens 415. In a projector using a liquid crystal panel of a type that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the light from the light source device 411 that emits randomly polarized light cannot be used. For this reason, by using the polarization conversion element 414, the light emitted from the light source device 411 is converted into substantially one type of polarized light, and the light use efficiency in the optical device 44 is increased.

As shown in FIG. 1, the color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the integrator illumination optical system 41 by the dichroic mirrors 421 and 422. Has a function of separating the light into three color lights of red, green, and blue.
As shown in FIG. 1, the relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and the red light separated by the color separation optical system 42 is red, which will be described later of the optical device 44. It has a function of guiding to the light modulation device on the light side.

  At this time, the dichroic mirror 421 of the color separation optical system 42 reflects the blue light component of the light beam emitted from the integrator illumination optical system 41 and transmits the red light component and the green light component. The blue light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 418, and reaches a later-described blue light side light modulation device of the optical device 44. The field lens 418 converts each partial light emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 418 provided on the light incident side of the other liquid crystal panel for green light and red light.

  Of the red light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 418, and reaches a later-described light modulation device on the green light side of the optical device 44. On the other hand, the red light passes through the dichroic mirror 422, passes through the relay optical system 43, further passes through the field lens 418, and reaches a later-described red light side light modulation device of the optical device 44. The relay optical system 43 is used for red light because the optical path length of the red light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light divergence or the like. Because. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 418 as it is. In this embodiment, since the optical path length of red light is long, such a configuration is adopted. However, a configuration in which the optical path length of blue light is increased is also conceivable.

As shown in FIG. 1, the optical device 44 includes three incident-side polarizing plates 442 and three light modulation devices 441 (red light-side light modulation devices arranged on the light-emission side of the incident-side polarizing plates 442, respectively). 441R, the green light side light modulation device 441G, and the blue light side light modulation device 441B), and viewing angles as three optical conversion elements respectively disposed on the light beam emission side of these light modulation devices 441 It includes a correction plate 443, three exit-side polarizing plates 444, and a cross dichroic prism 440 as a color synthesizing optical device disposed on the light exit side of the three exit-side polarizing plates 444. Of these, the three light modulation devices 441, the three viewing angle correction plates 443, the three exit-side polarizing plates 444, and the cross dichroic prism 440 are integrated to form an optical device body described later. In the present embodiment, the three incident-side polarizing plates 442 are configured separately from the optical device main body, but may be configured to be integrated.
Although the specific configuration of the optical device 44 will be described later, there are three incident-side polarizing plates 442, three light modulators 441, three viewing angle correction plates 443, three emission-side polarizing plates 444, and a cross dichroic. In addition to the prism 440, a main tank, a fluid pumping unit, a radiator, a fluid circulation member, a fluid branching unit, a focus adjusting device, and a fluid feeding unit are provided.

The three incident-side polarizing plates 442 receive the respective color lights whose polarization directions are aligned in one direction by the polarization conversion element 414, and out of the incident light beams, the polarization directions of the light beams aligned by the polarization conversion element 414 It transmits only polarized light in substantially the same direction and absorbs other light beams. Although not specifically shown, these incident side polarizing plates 442 have a configuration in which a polarizing film is pasted on a translucent substrate such as sapphire glass or crystal.
Detailed configurations of the light modulation device 441, the viewing angle correction plate 443, the exit-side polarizing plate 444, and the cross dichroic prism 440 will be described later.

  The projection lens 45 is configured as a combined lens in which a plurality of lenses are combined. The projection lens 45 enlarges and projects a color image formed by an optical device main body, which will be described later, of the optical device 44 on a screen (not shown).

FIG. 2 is a perspective view of a part of the projector 1 as viewed from above. In FIG. 2, the optical components in the optical component housing 46 are shown only for the optical device main body (to be described later) of the optical device 44 for the sake of simplification, and the other optical components 41 to 43 and 442 are shown as follows. Omitted.
FIG. 3 is a perspective view of a part of the projector 1 as viewed from below.
The optical component casing 46 is made of, for example, a metal member, and as shown in FIG. 1, a predetermined illumination optical axis A is set therein, and the optical components 41 to 43, 442, 45, and optical components described above are used. An optical device body to be described later of the device 44 is arranged at a predetermined position with respect to the illumination optical axis A. The optical component casing 46 is not limited to a metal member, and may be made of other materials. As shown in FIG. 2, the optical component housing 46 includes a container-shaped component storage member 461 that stores optical components 41 to 43 and 442 and an optical device main body, which will be described later, of the optical device 44, and a component storage member 461. And a lid-like member (not shown) that closes the opening.

Among these, in the component storage member 461, the above-described optical components 412 to 415, 418, 421 to 423, 431 to 434, and 442 are slid from the upper side on the inner surface of the side surface as shown in FIG. A groove portion 461A for insertion is formed.
Further, as shown in FIG. 2, a projection lens installation portion 461 </ b> B for installing the projection lens 45 at a predetermined position with respect to the illumination optical axis A is formed on the front portion of the side surface. The projection lens installation portion 461B is formed in a substantially rectangular shape in plan view, and a circular hole (not shown) corresponding to the light beam emission position from the optical device 44 is formed in a substantially central portion in plan view. A color image formed by an optical device main body 44 described later is enlarged and projected by the projection lens 45 through the hole.
Further, as shown in FIG. 3, the component storage member 461 has three holes 461 </ b> C formed corresponding to the position of the light modulation device 441 of the optical device 44, and a later-described fluid branch of the optical device 44. And a hole 461D formed corresponding to the cooling fluid inflow portion. Here, the cooling air introduced from the outside of the projector 1 by the sirocco fan 31 of the cooling unit 3 is discharged from the discharge port 31A (FIG. 3) of the sirocco fan 31 and guided to the hole 461C through a duct (not shown). .

[3. Configuration of optical device)
As shown in FIGS. 1 to 3, the optical device 44 includes three light modulation devices 441 (FIGS. 1 and 2), three viewing angle correction plates 443 (FIG. 1), and three exit-side polarizing plates 444 (FIG. 1). 1), an optical device main body 44A (FIG. 2) in which the cross dichroic prism 440 (FIG. 1) is integrated, a main tank 445, a fluid pumping unit 446, a radiator 447, and a plurality of fluid circulation members 448. Prepare.
The plurality of fluid circulation members 448 are formed of aluminum tubular members so that the cooling fluid can be convected therein, and connect the members 440 and 445 to 447 so that the cooling fluid can circulate. Then, the heat generated in the light modulation device 441 and the viewing angle correction plate 443 constituting the optical device main body 44A is cooled by the circulating cooling fluid.
In the present embodiment, ethylene glycol, which is a transparent non-volatile liquid, is employed as the cooling fluid. The cooling fluid is not limited to ethylene glycol, and other liquids may be employed. Table 1 below shows the cooling fluid that can be used in the present embodiment and the refractive index of the cooling fluid. In addition, the various cooling fluids shown in Table 1 may be employed alone, or a cooling fluid obtained by mixing at least one of various cooling fluids may be employed.

  Below, each member 440,445-447 is demonstrated in order from the upstream with respect to the light modulation apparatus 441 along the flow path of the circulating cooling fluid.

[3-1. Main tank structure]
As shown in FIG. 2 or FIG. 3, the main tank 445 has a substantially cylindrical shape and is composed of two container-like members made of aluminum. The main tank 445 is internally connected by connecting the opening portions of the two container-like members to each other. Temporarily accumulates cooling fluid. These container-like members are connected by interposing an elastic member such as seal welding or rubber, for example.

In the main tank 445, a cooling fluid inflow portion 445A that allows cooling fluid to flow into the interior and a cooling fluid outflow portion 445B that causes the inside cooling fluid to flow outside as shown in FIG. Is formed.
The cooling fluid inflow portion 445A and the cooling fluid outflow portion 445B are configured by a substantially cylindrical member having a tube diameter smaller than the tube diameter of the fluid circulation member 448, and are disposed so as to protrude in and out of the main tank 445. ing. One end of the fluid circulation member 448 is connected to one end protruding to the outside of the cooling fluid inflow portion 445 </ b> A, and cooling fluid from the outside flows into the main tank 445 through the fluid circulation member 448. In addition, one end of the other fluid circulation member 448 is connected to one end of the cooling fluid outflow portion 445B that protrudes to the outside, and the cooling fluid inside the main tank 445 flows out to the outside via the fluid circulation member 448.

In addition, on the outer peripheral surface of the main tank 445, three fixing portions 445C are formed in each of the two container-like members, as shown in FIG. 2 or FIG. By inserting the screw 445D through 445C and screwing it into the bottom surface of the outer case 2, the two container-like members are in close contact with each other and the main tank 445 is fixed to the outer case 2.
The main tank 445 is disposed in a triangular region in plan view formed by the optical component casing 46 and the inner surface of the outer case 2 as shown in FIG. 1 or FIG. By disposing the main tank 445 in this region, the storage efficiency in the outer case 2 can be improved, and the projector 1 does not increase in size.

[3-2. Structure of fluid pumping section]
The fluid pumping unit 446 sends in the cooling fluid accumulated in the main tank 445 and forcibly sends out the sent cooling fluid to the outside. For this reason, as shown in FIG. 3, the fluid pumping part 446 is connected to the other end of the fluid circulation member 448 connected to the cooling fluid outflow part 445B of the main tank 445, and sends the cooling fluid to the outside. The other fluid circulation member 448 is connected in communication with one end.
Although not specifically illustrated, the fluid pumping unit 446 has, for example, a configuration in which an impeller is disposed in a substantially rectangular parallelepiped aluminum hollow member, and is controlled by a control device (not illustrated). By rotating the impeller, the cooling fluid accumulated in the main tank 445 is forcibly sent via the fluid circulation member 448, and the sent cooling fluid is forcibly sent to the outside via the fluid circulation member 448. To send. In such a configuration, the fluid pressure feeding unit 446 can reduce the thickness dimension of the impeller in the rotation axis direction, and can be disposed in an empty space inside the projector 1. Improvement can be achieved and the projector 1 will not be enlarged. In the present embodiment, the fluid pumping unit 446 is disposed below the projection lens 45 as shown in FIG. 2 or FIG.

[3-3. Structure of optical device body]
FIG. 4 is an exploded perspective view showing a schematic configuration of the optical device main body 44A. In FIG. 4, only the G color light side is disassembled to simplify the description. The R and B color light sides have the same structure as the G color light side.
As shown in FIG. 4, the optical device main body 44A includes three light modulation devices 441, three viewing angle correction plates 443, three exit-side polarizing plates 444, a cross dichroic prism 440, and a fluid branching portion 4401. Three focus adjustment devices 4402 and a fluid inlet 4403 are provided.

[3-3-1. Structure of optical modulator]
The light modulation device 441 includes a liquid crystal panel 4410 and a holding frame 4411 as shown in FIG.
Although not specifically illustrated, the liquid crystal panel 4410 has a configuration in which liquid crystal that is an electro-optical material is hermetically sealed between a pair of substrates made of glass or the like. One of the pair of substrates is a driving substrate for driving the liquid crystal, and is arranged in a direction orthogonal to the plurality of data lines and the plurality of data lines arranged in parallel to each other. It has a plurality of scanning lines, pixel electrodes arranged in a matrix corresponding to the intersection of the scanning lines and data lines, and switching elements such as TFTs (Thin Film Transistors). The other substrate is a counter substrate disposed to face the one substrate at a predetermined interval, and has a common electrode to which a predetermined voltage Vcom is applied. The pair of boards is electrically connected to a control device (not shown), and a flexible printed board 4410A that outputs a predetermined drive signal to the scanning lines, the data lines, the switching elements, the common electrodes, and the like. It is connected. By inputting a drive signal from the control device via the flexible printed board 4410A, a voltage is applied between the predetermined pixel electrode and the common electrode, and the liquid crystal interposed between the pixel electrode and the common electrode The orientation state is controlled, and the polarization direction of the polarized light beam emitted from the incident side polarizing plate 442 is modulated.
The holding frame 4411 is formed of a heat conductive member having a substantially rectangular parallelepiped shape, and the liquid crystal panel 4410 is housed and held therein and connected to the liquid crystal panel 4410 so that heat can be transferred.
In the holding frame 4411, an opening 4411A that transmits a light beam corresponding to the image forming region of the liquid crystal panel 4410 is formed in a substantially central portion of the rectangular shape in plan view, as shown in FIG.
Further, in the holding frame 4411, fixing holes 4411B for fixing the light modulation device 441 to the focus adjustment device 4402 are formed at the four corners of the rectangular shape in plan view, as shown in FIG.

[3-3-2. Structure of viewing angle correction plate]
The viewing angle correction plate 443 compensates for birefringence that occurs in the liquid crystal panel 4410. The viewing angle correction plate 443 expands the viewing angle of the projected image and improves the contrast of the projected image. As shown in FIG. 4, the viewing angle correction plate 443 has a configuration in which a viewing angle correction film 4431 as an optical conversion film is pasted on a translucent substrate 4430 such as sapphire or crystal.
Then, as shown in FIG. 4, the viewing angle correction plate 443 is fixed at a predetermined position on the end surface of the light incident side of the focus adjustment device 4402.

[3-3-3. Structure of exit-side polarizing plate]
The exit-side polarizing plate 444 transmits only polarized light having a predetermined polarization direction out of the light flux emitted from the liquid crystal panel 4410 and passing through the viewing angle correction plate 443, and absorbs the other light flux. As shown in FIG. 4, the exit-side polarizing plate 444 has a configuration in which a polarizing film 4441 is pasted on a light-transmitting substrate 4440 such as sapphire or crystal, similar to the incident-side polarizing plate 442. The transmission axis for transmission is arranged so as to be substantially orthogonal to the transmission axis of the incident-side polarizing plate 442.
Then, as shown in FIG. 4, the exit-side polarizing plate 444 is fixed to the light-incident-side end surface of the cross dichroic prism 440 with an adhesive having thermal conductivity.

[3-3-4. Structure of cross dichroic prism]
The cross dichroic prism 440 forms a color image by synthesizing the optical image modulated for each color light emitted from the emission side polarizing plate 444. The cross dichroic prism 440 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right-angle prisms are bonded together. These dielectric multilayer films are emitted from the light modulation devices 441R and 441B, reflect the respective color lights via the viewing angle correction plate 443 and the emission side polarizing plate 444, and are emitted from the light modulation device 441G and are viewed angle correction plate 443 and The colored light is transmitted through the exit side polarizing plate 444. In this manner, the color lights modulated by the light modulation devices 441R, 441G, and 441B are combined to form a color image.

[3-3-5. Structure of fluid branch]
As shown in FIG. 4, the fluid branching portion 4401 is configured by a substantially rectangular parallelepiped aluminum hollow member having substantially the same planar shape as the upper or lower surface of the cross dichroic prism 440. The fluid branching unit 4401 feeds the cooling fluid forcibly sent from the fluid pumping unit 446, and branches the sent cooling fluid for each of the three focus adjustment devices 4402. Further, as shown in FIG. 4, the fluid branching portion 4401 is fixed to the lower surface of the cross dichroic prism 440 and has a function as a prism fixing plate that supports the cross dichroic prism 440.
In the fluid branching portion 4401, a cooling fluid inflow portion 4401A for allowing the cooling fluid pumped from the fluid pumping portion 446 to flow therein is formed at a substantially central portion of the bottom surface as shown in FIG. This cooling fluid inflow portion 4401A is composed of a substantially cylindrical member having a pipe diameter smaller than the diameter of the fluid circulation member 448, similar to the cooling fluid inflow portion 445A of the main tank 445. It is arranged to protrude. Further, the other end of the fluid circulation member 448 connected to the fluid pressure feeding portion 446 is connected to the integral part protruding outside the cooling fluid inflow portion 4401A, and the pressure is fed from the fluid pressure feeding portion 446 via the fluid circulation member 448. The cooled cooling fluid flows into the fluid branch portion 4401.

  In addition, as shown in FIG. 4, arm portions 4401B extending along the bottom surface are formed at the four corners of the bottom surface, respectively. Holes 4401B1 are formed in the tip portions of these arm portions 4401B, screws (not shown) are inserted into these holes 4401B1, and screwed into the component housing member 461 of the optical component housing 46, thereby making the optical device main body 44A. Is fixed to the component storage member 461. At this time, the fluid branch portion 4401 and the optical component casing 46 are connected so as to be capable of transferring heat. Thus, the fluid branching portion 4401 is connected to the optical component housing 46 so as to be able to transfer heat, thereby securing a heat transfer path from the circulating cooling fluid to the fluid branching portion 4401 to the optical component housing 46. Thus, the cooling efficiency of the cooling fluid can be improved, and consequently, the cooling efficiency of the liquid crystal panel 4410 and the viewing angle correction plate 443 can be improved by the cooling fluid. Further, if the sirocco fan 31 is blown along the bottom surface of the optical component casing 46, the heat radiation area of the circulating cooling fluid can be increased, and the cooling efficiency can be improved.

Further, in this fluid branching portion 4401, the cooling fluid that has been fed is branched into three focus adjustment devices 4402 on three side surfaces corresponding to the light beam incident side end surface of the cross dichroic prism 440 as shown in FIG. A cooling fluid outflow portion 4401C to be sent out is formed. In FIG. 4, only the cooling fluid outflow portion 4401C on the R, G color light side is illustrated, but it is assumed that the cooling fluid outflow portion is also formed on the B color light side.
Like the cooling fluid inflow portion 4401A, these cooling fluid outflow portions 4401C are composed of a substantially cylindrical member having a tube diameter smaller than the tube diameter of the fluid circulation member 448, and project into the fluid branching portion 4401. Is arranged. One end of each cooling fluid outflow portion 4401C projecting to the outside is connected to one end of a fluid circulation member 448, and the cooling fluid inside the fluid branch portion 4401 is branched via the fluid circulation member 448 to the outside. And leaked.
Further, in the fluid branch portion 4401, a spherical bulge portion is formed at a substantially central portion of the upper surface, although not specifically shown. Then, by bringing the lower surface of the cross dichroic prism 440 into contact with the bulging portion, the position of the cross dichroic prism 440 in the tilt direction with respect to the fluid branching portion 4401 can be adjusted.

[3-3-6. Structure of focus adjustment device]
The three focus adjustment devices 4402 are configured to be able to enclose a cooling fluid therein, and hold the three light modulation devices 441 and the three viewing angle correction plates 443 so as to be able to transfer heat to the internal cooling fluid. Further, these focus adjustment devices 4402 change the thickness dimension of the internal cooling fluid in the direction of the illumination optical axis A and change the optical path length of the light beam passing through the internal cooling fluid, so that the back focus position of the projection lens 45 is obtained. The liquid crystal panel 4410 can be adjusted in position. As shown in FIG. 4, the focus adjustment device 4402 includes a first frame member 4404, a second frame member 4405, a translucent substrate 4406 (see FIG. 6), elastic members 4407 and 4408, screws, and the like. Four adjustment screws 4409 as a joint member are provided.

FIG. 5 is a perspective view of the first frame-like member 4404 as seen from the light beam exit side.
The first frame member 4404 is disposed on the light beam incident side of the second frame member 4404, supports the second frame member 4404 so as to be movable, and supports and fixes the light modulation device 441 and the viewing angle correction plate 443. It is constituted by a member made of aluminum. As shown in FIG. 4 or FIG. 5, the first frame-like member 4404 includes a first plate body 4404A, a first projecting portion 4404B (FIG. 5), and a mounting portion 4404C, and is a substantially rectangular parallelepiped container. Has a shape.
The first plate body 4404A is a plate body having a rectangular frame shape in plan view and having an opening 4404D corresponding to the image forming area of the liquid crystal panel 4410 at a substantially central portion. As shown in FIG. 4, the viewing angle correction plate 443 is an elastic member such that the viewing angle correction film 4431 is positioned on the light beam incident side and the transparent substrate 4430 closes the opening 4404D of the first plate body 4404A. The first plate body 4404A is attached to the light beam incident side end surface via 4407.

In the first plate body 4404A, four screw holes 4404E are formed at the peripheral position of the opening 4404D corresponding to the four fixing holes 4411B of the holding frame 4411 of the light modulation device 441 as shown in FIG. Has been. Then, as shown in FIG. 4, the light modulation device 441 screws the four fixing screws 449 into the four screw holes 4404E of the first plate body 4404A through the four fixing holes 4411B of the holding frame 4411, respectively. Thus, the first plate body 4404A is fixed. Here, the fixing screw 449 is made of a heat conductive member such as metal, and the first frame member 4404 and the holding frame 4411 are fixed by fixing the light modulation device 441 to the first plate body 4404A by the fixing screw 449. And are connected so that heat can be transferred.
In the first plate body 4404A, screw holes 4404F that pass through the light beam incident side end surface and the light beam emission side end surface and screw with the adjustment screw 4409 are formed at positions near the four corners as shown in FIG. ing.

As shown in FIG. 5, the first protrusion 4404B protrudes from the end surface of the first plate 4404A on the light beam exit side, has a circular frame shape surrounding the opening 4404D in a plane, and has a second frame-shaped member 4405. It is a part which fits into the 2nd protrusion part mentioned later.
The mounting portion 4404C protrudes from the outer peripheral edge of the first plate body 4404A toward the light beam exit side so as to be substantially orthogonal to the first plate body 4404A, and has a shape in which the distal end portion in the protrusion direction is bent outward by approximately 90 °. ing. Then, as shown in FIG. 4, the focus adjustment device 4402 is fixed to the cross dichroic prism 440 by abutting the tip portion of the mounting portion 4404C on the light beam incident side end surface of the cross dichroic prism 440 and fixing with an adhesive or the like. The
As shown in FIG. 4 or FIG. 5, the mounting portion 4404C has a protruding portion protruding from the upper and lower edges of the first plate body 4404A (the container-shaped upper and lower side end surfaces of the first frame-like member 4404), as shown in FIG. Insertion portions 4404G that allow the passage and the inlet, which will be described later, of the frame-like member 4405 to be inserted, respectively, are formed.

The second frame-like member 4405 is made of an aluminum member, like the first frame-like member 4404, and is disposed inside the container shape of the first frame-like member 4404, and its position relative to the first frame-like member 4404 can be changed. It is configured. As shown in FIG. 4, the second frame-like member 4405 includes a second plate body 4405A and a second projecting portion 4405B.
The second plate body 4405A is a plate member having a rectangular frame shape in plan view having an opening 4405C corresponding to the image forming area of the liquid crystal panel 4410 at a substantially central portion. The inner side surface of the opening 4405C is formed in a stepped shape with a small opening area on the light beam exit side (see FIG. 6). Then, a translucent substrate 4406 is fitted and fixed to the opening 4405C from the light incident side (see FIG. 6).
In the second plate 4405A, fixing holes 4405D are formed at positions near the four corners, corresponding to the four screw holes 4404F of the first frame-like member 4404, as shown in FIG.

As shown in FIG. 4, the second protrusion 4405 </ b> B protrudes from the light incident side end surface of the second plate body 4405 </ b> A and has a circular frame shape surrounding the opening 4405 </ b> C in a plane. The diameter of the circular frame shape of the second protrusion 4405B is set larger than the diameter of the circular frame of the first protrusion 4404B of the first frame member 4404. Therefore, the second protrusion 4405B of the second frame member 4405 can be fitted to the first protrusion 4404B of the first frame member 4404 via the elastic member 4408.
Then, the opening 4404D of the first frame member 4404 is closed by the elastic member 4407 and the viewing angle correction plate 443, and the opening 4405C of the second frame member 4405 is closed by the translucent substrate 4406. When the second projecting portion 4405B is fitted to the projecting portion 4404B via the elastic member 4408, a fluid sealing chamber capable of enclosing a cooling fluid between the second frame-like member 4405 and the first frame-like member 4404. R (see FIG. 6) is formed.

  Further, as shown in FIG. 4, below the second projecting portion 4405B, a flow for allowing the cooling fluid flowing out from the cooling fluid outflow portion 4401C of the fluid branching portion 4401 to flow into the fluid sealing chamber R (see FIG. 6). An inlet 4405E is formed. The inflow port 4405E has a pipe diameter smaller than the pipe diameter of the fluid circulation member 448, and is constituted by a substantially cylindrical member that communicates with the inside of the circular frame of the second protrusion 4405B. Is formed so as to protrude downward. In a state where the second frame member 4405 is attached to the first frame member 4404, the inflow port 4405E is inserted into the insertion portion 4404G on the lower side of the first frame member 4404. The other end of the fluid circulation member 448 connected to the cooling fluid outflow portion 4401C of the fluid branching portion 4401 is connected to the end protruding from the insertion portion 4404G of the inflow port 4405E, via the fluid circulation member 448. The cooling fluid flowing out from the fluid branching portion 4401 flows into the fluid sealing chamber R (see FIG. 6).

  Furthermore, as shown in FIG. 4, an outlet 4405F is formed on the upper side of the second protrusion 4405B to allow the cooling fluid inside the fluid enclosure chamber R (see FIG. 6) to flow out. Like the inflow port 4405E, the outflow port 4405F has a tube diameter smaller than that of the fluid circulation member 448, and is composed of a substantially cylindrical member that communicates with the inner side of the circular frame of the second protrusion 4405B. The second frame-like member 4405 is formed so as to protrude upward. In a state where the second frame-shaped member 4405 is attached to the first frame-shaped member 4404, the outlet 4405F is inserted into the insertion portion 4404G on the upper side of the first frame-shaped member 4404. A fluid circulation member 448 is connected to the end of the outlet 4405F protruding from the insertion portion 4404G, and the cooling fluid flowing into the fluid enclosure R (see FIG. 6) through the inlet 4405E is circulated in the fluid. It flows out through the member 448 to the outside.

The light-transmitting substrate 4406 is formed using a light-transmitting glass substrate.
The elastic members 4407 and 4408 are such that the cooling fluid inside the fluid sealing chamber R (see FIG. 6) allows the clearance between the periphery of the opening 4404D of the first frame-like member 4404 and the viewing angle correction plate 443 and the first frame-like member 4404. This prevents leakage from the gap between the first protrusion 4404B and the second protrusion 4405B of the second frame-like member 4405. These elastic members 4407 and 4408 are formed of elastic silicon rubber, and are subjected to surface treatment for increasing the cross-linking density of the surface layer on both sides or one side. For example, as the elastic members 4407 and 4408, the Sircon GR-d series (trademark of Fuji Polymer Industries) can be adopted. Here, the surface treatment is performed on the end face, whereby the work of installing the elastic members 4407 and 4408 can be easily performed.

The four adjustment screws 4409 are members that fix the second frame-shaped member 4405 to the first frame-shaped member 4404 and move the second frame-shaped member 4405 relative to the first frame-shaped member 4404. These adjustment screws 4409 are screwed into the respective screw holes 4404F of the first frame-like member 4404, and the tip portions thereof are inserted into the respective fixing holes 4405D of the second frame-like member 4405. Two nuts 4409A (see FIG. 6) are fixed to the tip portion of the adjustment screw 4409, and the second frame-like member 4405 is sandwiched between the nuts 4409A.
The structure in which the second frame member 4405 moves relative to the first frame member 4404 by the adjustment screw 4409 will be described when the method for manufacturing the projector 1 is described.

[3-3-7. Structure of fluid inlet]
As shown in FIG. 4, the fluid inlet 4403 is formed of a substantially rectangular parallelepiped aluminum hollow member having substantially the same planar shape as the upper or lower surface of the cross dichroic prism 440, and is formed on the upper surface of the cross dichroic prism 440. Fixed. The fluid feeding unit 4403 collectively feeds the cooling fluid sent from each focus adjustment device 4402 and sends the sent cooling fluid to the outside.
As shown in FIG. 4, the fluid feeding portion 4403 has three cooling fluid inflow portions 4403 </ b> A that allow the cooling fluid delivered from each focus adjustment device 4402 to flow into the fluid feeding portion 4403. These cooling fluid inflow portions 4403A are formed of a substantially cylindrical member having a tube diameter smaller than the tube diameter of the fluid circulation member 448, and are disposed so as to protrude into and out of the fluid inlet 4403. The other ends of the fluid circulation members 448 connected to the outlets 4405F of the three focus adjustment devices 4402 are connected to the end portions of the cooling fluid inflow portions 4403A that protrude outward. The cooling fluid sent from each focus adjustment device 4402 flows into the fluid inlet 4403 at once.

  Further, in the fluid inlet portion 4403, a cooling fluid outlet portion 4403B is formed on the end surface corresponding to the end surface of the cross dichroic prism 440 on the light beam exit side, as shown in FIG. Has been. Like the cooling fluid inflow portion 4403A, the cooling fluid outflow portion 4403B is formed of a substantially cylindrical member having a tube diameter smaller than the tube diameter of the fluid circulation member 448, and protrudes into and out of the fluid inflow portion 4403. Are arranged as follows. The other end of the fluid circulation member 448 connected to the cooling fluid inflow portion 445A of the main tank 445 is connected to the end protruding to the outside of the cooling fluid outflow portion 4403B, and fluid is fed through the fluid circulation member 448. The cooling fluid inside the entrance 4403 flows into the main tank 445.

[3-3-8. Radiator structure]
As shown in FIG. 1 or FIG. 2, the radiator 447 is disposed in the partition wall 21 formed in the exterior case 2 and radiates heat of the cooling fluid flowing from the fluid inlet 4403 to the main tank 445. As shown in FIG. 2 or FIG. 3, the radiator 447 has a plurality of heat radiation fins 4471.
The plurality of radiating fins 4471 are configured by a plate made of a heat conductive member such as metal, and are configured to be able to pass through the fluid circulation member 448 connecting the fluid inlet 4403 and the main tank 445. Connect to communicate. The plurality of radiating fins 4471 are formed so as to extend in a direction perpendicular to the insertion direction of the fluid circulation member 448, and are arranged in parallel along the insertion direction. In such an arrangement state of the plurality of radiation fins 4471, the cooling air discharged from the axial fan 32 passes between the plurality of radiation fins 4471.

  As described above, the cooling fluid is supplied from the main tank 445 to the fluid pressure feeding unit 446 to the fluid branching unit 4401 to the focus adjusting devices 4402 to the fluid feeding unit 4403 to the radiator 447 to the main through the plurality of fluid circulation members 448. It circulates through a flow path called a tank 445.

[4. (Cooling structure)
Next, the cooling structure of the light modulation device 441 and the viewing angle correction plate 443 will be described.
FIG. 6 is a diagram for explaining a cooling structure of the light modulation device 441 and the viewing angle correction plate 443. Specifically, FIG. 6 is a cross-sectional view of the optical device main body 44A viewed from the side.
When the fluid pumping unit 446 is driven, the cooling fluid in the main tank 445 is fed into the fluid pumping unit 446 via the fluid circulation member 448 and is also sent from the fluid pumping unit 446 to the fluid branching unit 4401. The
Then, the cooling fluid sent into the fluid branch portion 4401 flows into the fluid sealing chamber R from the inlet 4405E of the focus adjustment device 4402 via the fluid circulation member 448.
Here, the heat generated in the liquid crystal panel 4410 by the light flux emitted from the light source device 411 follows the heat transfer path of the liquid crystal panel 4410 to the holding frame 4411 to the fixing screw 449 to the first frame member 4404 to adjust the focus. It is transmitted to the cooling fluid in the fluid enclosure R of the device 4402.
In addition, the heat generated in the viewing angle correction plate 443 by the light beam emitted from the light source device 411 is transmitted to the cooling fluid in the fluid sealing chamber R through the first frame member 4404.

  The heat transferred to the cooling fluid in the fluid sealing chamber R moves from the bottom to the top according to the flow of the cooling fluid, and moves to the fluid inlet 4403 through the fluid circulation member 448 connected to the outlet 4405F. To do. Then, when the heated cooling fluid moves from the fluid inlet 4403 to the main tank 445 via the fluid circulation member 448, heat passes through the radiator 447 so that heat is supplied to the fluid circulation member 448 to the plurality of heat radiation fins 4471. Communicated. Further, the heat transmitted to the plurality of heat radiation fins 4471 is cooled by the cooling air discharged from the axial fan 32.

The cooling air introduced from the outside of the projector 1 by the sirocco fan 31 of the cooling unit 3 is introduced into the optical component housing 46 through a hole 461C formed in the bottom surface of the optical component housing 46. The
Then, the cooling air introduced into the optical component casing 46 by the sirocco fan 31 circulates from below to above as shown in FIG.
At this time, as shown in FIG. 6, the cooling air flowing from the lower side to the upper side flows along the light beam incident side end surface of the light modulation device 441 and the gap between the light modulation device 441 and the first frame-like member 4404. Then, the light modulation device 441, the first frame member 4404, and the viewing angle correction plate 443 are cooled.
Further, as shown in FIG. 6, a part of the cooling air flowing upward from below enters the inside of the first frame-like member 4404 from the lower insertion portion 4404G of the focus adjustment device 4402, and enters the upper side. It circulates toward the outside of the focus adjustment device 4402 via the insertion portion 4404G. At this time, the second frame-like member 4405 and the exit-side polarizing plate 444 are also cooled by the cooling air.

[5. Projector manufacturing method]
Next, a method for manufacturing the projector 1 will be described.
FIG. 7 is a flowchart illustrating a method for manufacturing projector 1.
First, as shown below, the optical unit 4 is assembled (processing S1).
The three focus adjustment devices 4402, the three viewing angle correction plates 443, and the three light modulation devices 441 are respectively integrated to form three panel units (processing S11).
Specifically, first, the first frame-like member 4404, the second frame-like member 4405, and the translucent substrate 4406 are attached to a focus adjustment device 4402 that is integrated in advance while adjusting the posture of the viewing angle correction plate 443. .
As the posture adjustment of the viewing angle correction plate 443, for example, a focus adjustment device 4402 is installed in an angle adjustment device (not shown). Then, the viewing angle correction plate 443 is held by the angle adjusting jig constituting the angle adjusting device, and the light flux is introduced into the viewing angle correction plate 443. Thereafter, the light flux is detected through a reference polarizing plate (not shown) having substantially the same transmission axis as that of the viewing angle correction plate 443 and the incident-side polarizing plate 442. In addition, based on the detected illuminance or extinction ratio of the luminous flux, the angle adjustment jig is operated to adjust the attitude of the viewing angle correction plate 443, and the elastic member 4407 is attached to the periphery of the opening 4404 D of the first frame-like member 4404. The viewing angle correction plate 443 is fixed with an adhesive having thermal conductivity.
Next, focus adjustment of the light modulation device 441 is performed by screwing the four fixing screws 449 into the four screw holes 4404E of the first frame-like member 4404 through the four fixing holes 4411B of the light modulation device 441, respectively. Secure to device 4402.
The above process is performed corresponding to the three light modulation devices 441R, 441G, and 441B to form three panel units.

After the process S11, the cross dichroic prism 440, the three exit side polarizing plates 444, the fluid branching part 4401, and the fluid inlet part 4403 are integrated to form a prism unit (process S12).
Specifically, first, the fluid branching portion 4401 is installed in a positioning device (not shown). Then, a thermosetting adhesive or an ultraviolet curable adhesive is applied to a bulge portion (not shown) of the fluid branch portion 4401 so that the lower surface of the cross dichroic prism 440 is brought into contact with the bulge portion of the fluid branch portion 4401. Then, the position of the cross dichroic prism 440 is adjusted with respect to the fluid branch portion 4401 while the adhesive is uncured. After the position adjustment, the adhesive is cured with hot air or ultraviolet rays, and the fluid branch portion 4401 and the cross dichroic prism 440 are fixed.
As the position adjustment of the cross dichroic prism 440 with respect to the fluid branching portion 4401, for example, the upper surface of the cross dichroic prism 440 is detected by an optical image detection device such as a CCD (Charge Coupled Device), and the cross dichroic is detected based on the detected image. A configuration in which the position of the cross formed by the two dielectric multilayer films of the prism 440 is adjusted to a predetermined position can be employed. Further, for example, a configuration may be employed in which a light beam is introduced from the light beam incident side end surface of the cross dichroic prism 440 and the position of the cross dichroic prism 440 is adjusted based on the light beam emitted from the light beam emission side end surface.
Next, an anaerobic adhesive is applied to the upper surface of the cross dichroic prism 440, and the fluid feeding portion 4403 is placed on the upper surface of the cross dichroic prism 440 using a positioning jig (not shown). Thereafter, the fluid branching portion 4401, the cross dichroic prism 440, and the fluid feeding portion 4403 are left in the dryer (for example, at 65 ° C. for 15 minutes) together with the positioning jig described above to cure the anaerobic adhesive. Let
Further, the three exit-side polarizing plates 444 are attached to the end surfaces of the light incident side of the cross dichroic prism 440 while adjusting the posture. As the posture adjustment of the exit side polarizing plate 444, the same method as the posture adjustment of the viewing angle correction plate 443 described above can be employed.

After the process S12, the three panel units assembled in the process S11 and the prism unit assembled in the process S12 are integrated to assemble the optical device main body 44A (process S13).
Specifically, each of the cross dichroic prisms 440 constituting the prism unit is applied in an uncured state by applying a thermosetting adhesive or an ultraviolet curable adhesive to the mounting portion 4404C of the focus adjustment device 4402 constituting each panel unit. The mounting unit 4404C is brought into contact with the end surface of the light incident side, and each panel unit is mounted.
Next, an inflow port 4405E and an outflow port 4405F of each focus adjustment device 4402, each cooling fluid outflow portion 4401C of the fluid branching portion 4401, and each cooling fluid inflow portion 4403A of the fluid inflow portion 4403 are combined into six fluid circulation members 448. Connect with each.

After the processing S13, the optical components 41 to 43, 442, 45 and the optical device main body 44A are installed at predetermined positions of the component storage member 461 of the optical component casing 46 (processing S14).
Specifically, the optical components 412 to 415, 418, 421 to 423, 431 to 434, and 442 are slidably fitted into the respective groove portions 461A of the component storage member 461. Further, the light source device 411, the projection lens 45, and the optical device main body 44A are arranged at predetermined positions of the component storage member 461. In addition, the following processes shall be implemented in the state which filled the cooling fluid in the fluid enclosure chamber R of each focus adjustment apparatus 4402. That is, not shown in the cooling fluid inflow portion 4401A of the fluid branching portion 4401 and the cooling fluid outflow portion 4403B of the fluid feeding portion 4403 so that the cooling fluid inside the fluid branching portion 4401 and the fluid feeding portion 4403 does not leak to the outside. Install a sealing plug. In addition to the above configuration, in process S14, the optical device main body 44A, the main tank 445, the fluid pumping unit 446, and the radiator 447 constituting the optical device 44 are connected by a plurality of fluid circulation members 448, and the optical device is connected. It is good also as a structure which fills the cooling fluid in 44 flow paths.

  After the processing S14, the light source lamp 416 of the light source device 411 is turned on to emit a white light beam from the light source device 411 (processing S2), and the projected image after the emitted light beam passes through various optical components is displayed. Then, it is projected on a screen (not shown) (processing S3).

By the way, when each liquid crystal panel 4410 is not disposed at the back focus position of the projection lens 45, the projection image enlarged and projected through the projection lens 45 and projected onto a screen (not shown) becomes unclear. Further, when the mutual positions of the liquid crystal panels 4410 do not coincide with each other, pixel shift occurs in the projected image projected on the screen, and the image quality is impaired.
Therefore, after the process S3, based on the projected image projected on the screen, the position adjustment of each of the light modulation devices 441R, 441G, 441B is performed as described below (process S4). Although not specifically shown, in the present embodiment, a 3CCD camera is provided on the back surface of the screen, and a projected image projected on the screen is captured by the 3CCD camera. The image captured by the 3CCD camera is decomposed into three colors of red, green, and blue, and is output to the monitor as R, G, and B signals, and an image of each color light or each color light is superimposed on the monitor. An image is displayed. The following position adjustment is performed while confirming the image displayed on the monitor.

First, focus adjustment is performed in which each liquid crystal panel 4410 is arranged at the back focus position of the projection lens 45 (processing S41).
FIG. 8 is a cross-sectional view showing a moving state of the second frame-like member 4404 due to the rotation of the adjusting screw 4409.
Specifically, first, focus adjustment of the liquid crystal panel 4410 on the green light side is performed. Here, when performing the focus adjustment of the liquid crystal panel 4410, the focus adjustment device 4402 on the green light side is held by a position adjustment jig (not shown), and the position adjustment jig is operated to operate the focus adjustment device 4402. The adjustment screw 4409 is rotated.
When the adjustment screw 4409 is rotated, as shown in FIG. 8, the screwed state between the adjustment screw 4409 and the screw hole 4404F of the first frame-like member 4404 is changed, and the first frame-like member 4404 is changed. The adjustment screw 4409 moves back and forth. At this time, as shown in FIG. 8, the second frame-shaped member 4405 is sandwiched between two nuts 4409A fixed to the tip end portion of the adjustment screw 4409. Therefore, as the adjustment screw 4409 moves forward and backward. The position with respect to the first frame-like member 4405 is changed.

  Here, since there are four adjustment screws 4409, by rotating each adjustment screw 4409, the second frame member 4405 moves forward and backward in the direction of the illumination optical axis A relative to the first frame member 4404. And the change of the inclination state with respect to the plane orthogonal to the illumination optical axis A can be implemented. For this reason, changing the thickness of the cooling fluid in the fluid sealing chamber R in the direction of the illumination optical axis A in a uniform state in a direction orthogonal to the illumination optical axis A direction is also a direction orthogonal to the illumination optical axis A direction. It is also possible to change to different states continuously.

Then, by rotating the adjusting screw 4409 and changing the thickness of the cooling fluid inside the fluid sealing chamber R in the direction of the illumination optical axis A, the light flux passing through the cooling fluid inside the fluid sealing chamber R is shown as follows. The optical path length is changed, and focus adjustment of the liquid crystal panel 4410 is performed.
FIG. 9 is a schematic diagram illustrating a state in which the focus adjustment of the liquid crystal panel 4410 is performed by changing the optical path length of the light beam passing through the cooling fluid inside the fluid sealing chamber R.
For example, as shown in FIG. 9A, the back focus surface BF1 of the projection lens 45 is located on the rear side of the optical path of the illumination optical axis A with respect to the panel surface P of the liquid crystal panel 4410 of the light modulation device 441. In this case, each adjustment screw 4409 is rotated to move the second frame-shaped member 4405 away from the first frame-shaped member 4404, and in the direction of the illumination optical axis A in the cooling fluid in the fluid sealing chamber R. Is increased by a dimension D in a uniform state in a direction orthogonal to the direction of the illumination optical axis A. By adjusting in this way, there is a difference between the optical path length of the air layer in the thickness dimension D without changing the thickness dimension and the optical path length of the cooling fluid layer in the thickness dimension D with the thickness dimension changed. .
When the refractive index of the cooling fluid layer is n and the changed thickness dimension is D, the change amount Z of the optical path length is calculated by Equation 1 below. In Equation 1, the refractive index of the air layer is 1.

For example, when the refractive index of the cooling fluid layer is 1.5, the change amount Z of the optical path length is D / 3 according to Equation 1 above. For this reason, increasing the thickness dimension of the cooling fluid layer by D increases the optical path length by D / 3. Therefore, the position adjusting jig is operated and the adjusting screw 4409 is rotated so that the separation dimension D ₀ between the panel surface P and the back focus surface BF 1 and D / 3 which is the change amount of the optical path length are the same. By changing the thickness dimension D, the back focus surface BF1 is artificially arranged on the front side of the optical path of the illumination optical axis A and positioned on the panel surface P, and the projected image of the green light displayed on the monitor is in a clear state. can do.
When the back focus surface BF1 is located on the front side of the optical path of the illumination optical axis A with respect to the panel surface P, the adjustment opposite to the above is performed.

For example, as shown in FIG. 9B, when the back focus surface BF2 is inclined with respect to the panel surface P, that is, the panel surface P and the back focus surface BF2 are separated in the direction of the illumination optical axis A. When the dimension D ₀ is continuously different in a direction orthogonal to the direction of the illumination optical axis A, focus adjustment is performed as described below.
That is, by operating the position adjustment jig and rotating the adjustment screws 4409 so that the rotation adjustment amounts thereof are different, the second frame member 4405 moves so as to be inclined with respect to the first frame member 4404. The thickness of the cooling fluid in the fluid enclosure chamber R in the direction of the illumination optical axis A is continuously changed to a different state in a direction orthogonal to the illumination optical axis A direction. By adjusting in this way, similarly to the above, the optical path length is increased according to the changed thickness dimension D (for example, D / 3 is increased in the above). Here, as described above, the thickness of the cooling fluid in the fluid enclosure chamber R in the direction of the illumination optical axis A is continuously changed in a direction orthogonal to the direction of the illumination optical axis A. Accordingly, the change amount Z of the optical path length is continuously different in the direction orthogonal to the illumination optical axis A direction. Therefore, by operating the position adjusting jig and rotating the adjusting screw 4409 to change the thickness dimension D as described above, the inclination state of the back focus surface BF2 is corrected and positioned on the panel surface P, and the monitor is positioned on the monitor. The displayed green light projection image can be made clear.

After the process S41, as shown below, alignment adjustment of the liquid crystal panel 4410 on the green light side is performed (process S42).
By operating the position adjustment jig, the contact surface between the mounting portion 4404C and the cross dichroic prism 440 in the focus adjustment device 4402 is slid so that the green light projection image displayed on the monitor is positioned at a predetermined position. The focus adjustment device 4402 is moved as a moving surface, and alignment adjustment of the liquid crystal panel 4410 (adjustment in the directions of two axes (X axis, Y axis) perpendicular to each other in a plane orthogonal to the illumination optical axis A) and in the plane Rotation adjustment).

  After adjusting the alignment of the liquid crystal panel 4410 on the green light side in the process S42, a thermosetting adhesive or an ultraviolet curable adhesive filled between the mounting portion 4404C and the cross dichroic prism 440 in the focus adjustment device 4402. Then, the thermosetting adhesive is heated with hot air or ultraviolet rays, or the ultraviolet curing adhesive is irradiated with ultraviolet rays to cure the adhesive, and the focus adjustment device 4402 is fixed to the cross dichroic prism 440 (processing S43). . That is, the green light side liquid crystal panel 4410 is fixed to the cross dichroic prism 440 by the process S43.

Then, with the green light side liquid crystal panel 4410 whose position adjustment and fixing have been completed as a reference, the above-described processes S41 to S43 are also performed on the red light side and blue light side liquid crystal panels 4410 (process S44). . In step S44, the projected images of the respective color lights become clear, and the pixels in the projected images of the respective color lights coincide with each other so that the image quality is good.
In the processes S41 to S44, among the three liquid crystal panels 4410, first, the liquid crystal panel 4410 on the green light side was first performed, and then sequentially performed on the other liquid crystal panels 4410. Not limited to this, the processes S41 to S43 may be performed on the three liquid crystal panels 4410 substantially simultaneously.

After the processing S44, the optical component casing 46 in which the optical components 41 to 43, 442 and the optical device main body 44A are installed at predetermined positions is installed in the exterior case 2, and other members such as the cooling unit 3 are also installed. The projector 1 is assembled in the outer case 2 (process S5).
The projector 1 is manufactured by the process as described above.

  In the embodiment described above, since the projector 1 includes the focus adjustment device 4402, the thickness dimension in the direction of the illumination optical axis A in the cooling fluid enclosed in the fluid enclosure chamber R by changing the volume of the fluid enclosure chamber R is changed. By changing, the optical path length of the light beam passing through the cooling fluid can be changed. Thus, by changing the volume of the fluid sealing chamber R in the focus adjustment device 4402, the back focus surface of the projection lens 45 can be positioned on the panel surface of the liquid crystal panel 4410 without moving the light modulation device 441 directly. it can. Therefore, as the position adjustment jig for adjusting the position of the liquid crystal panel 4410, a structure for rotating each adjustment screw 4409 of the focus adjustment device 4402, and the focus adjustment device 4402 in a plane orthogonal to the illumination optical axis A It is only necessary to have a structure that moves in the biaxial direction (X axis, Y axis) and a structure that rotates in the plane. Therefore, as in the prior art, the light modulator 441 moves in the direction of the illumination optical axis A (Z direction), the structure moves in the rotation direction around the X axis (Xθ direction), and the Y axis as the center. It is not necessary to provide the position adjusting jig with a structure that moves in the rotation direction (Yθ direction), and the structure of the position adjusting jig can be simplified. For this reason, cost reduction and size reduction of the position adjusting jig can be achieved.

Here, the focus adjustment device 4402 includes a first frame-like member 4404, a second frame-like member 4405, a translucent substrate 4406, elastic members 4407 and 4408, and four adjustment screws 4409. Since the fluid sealing chamber R is formed by fitting the first projecting portion 4404B of the one frame-like member 4404 and the second projecting portion 4405B of the second frame-like member 4405, for example, an expandable bellows is used. Compared with the structure, the structure can be simplified and the manufacturing cost can be reduced. Further, by rotating each adjustment screw 4409, the volume of the fluid sealing chamber R can be easily changed, and the back focus surface of the projection lens 45 can be easily positioned on the panel surface of the liquid crystal panel 4410.
Here, since the four adjustment screws 4409 are configured, the second frame-shaped member 4405 moves forward and backward in the direction of the illumination optical axis A with respect to the first frame-shaped member 4404 by rotating each adjustment screw 4409. And the change of the inclination state with respect to the plane orthogonal to the illumination optical axis A can be favorably implemented. For this reason, changing the thickness of the cooling fluid in the fluid enclosure chamber R in the direction of the illumination optical axis A in a uniform state in the direction orthogonal to the illumination optical axis A is also possible in the direction orthogonal to the illumination optical axis A direction. It is also possible to change to different states continuously, and the back focus surface of the projection lens 45 can be easily and satisfactorily positioned on the panel surface of the liquid crystal panel 4410.

Since the light modulation device 441 is fixed to the first frame-like member 4404 of the focus adjustment device 4402, the focus adjustment device 4402 and the light modulation device 441 can be integrated, and the projector can be miniaturized. Further, a member for installing the focus adjustment device 4402 inside the projector 1 and a member for installing the light modulation device 441 inside the projector 1 can be shared, and the cost of the projector 1 can be reduced and the size can be reduced due to the omission of the members. Can be realized.
Here, since each focus adjustment device 4402 is fixed to each light beam incident side end surface of the cross dichroic prism 440 via the mounting portion 4404C, each light modulation device 441 is provided even when a plurality of light modulation devices 441 are configured. The apparatus 441, each focus adjustment apparatus 4402, and the cross dichroic prism 440 can be integrated, and the projector 1 does not increase in size.
Further, since the light modulation device 441 is fixed to the first frame-like member 4404 by a fixing screw 449, the light modulation device 441 is not displaced by an external force, and the projection lens is placed on the panel surface of the light modulation device 441. The 45 back focus surfaces can be positioned well, the mutual positions of the light modulation devices 441 can be maintained well, and a good optical image without pixel shift can be formed.
Further, since the light modulation device 441 is configured to be detachable with respect to the focus adjustment device 4402 by the fixing screw 449, the fixing screw 449 can be used even when the liquid crystal panel 4410 is replaced due to a malfunction of the liquid crystal panel 4410 or the like. The light modulation device 441 can be detached from the focus adjustment device 4402 by removing it, and the new light modulation device 441 can be easily attached by attaching the fixing screw 449, and the reworkability of the light modulation device 441 can be improved.

Further, when the light modulation device 441 is fixed to the first frame-like member 4404 by the fixing screw 449, the first frame-like member 4404 and the holding frame 4411 are connected so as to be able to transfer heat, and thus emitted from the light source device 411. The heat generated in the liquid crystal panel 4410 by the light flux can be dissipated by following the heat transfer path of the cooling fluid in the liquid crystal panel 4410 to the holding frame 4411 to the first frame member 4404 to the fluid sealing chamber R, and the cooling efficiency of the liquid crystal panel 4410 And the thermal deterioration of the liquid crystal panel 4410 can be prevented. For this reason, the lifetime of the projector 1 can be extended.
Here, each focus adjusting device 4402 is connected to the main tank 445, the fluid pressure feeding unit 446, the fluid branching unit 4401, the fluid feeding unit 4403, and the radiator 447 so that the cooling fluid can be circulated by the plurality of fluid circulation members 448. Therefore, the fluid inside the fluid sealing chamber R can be convected, the temperature difference between the liquid crystal panel 4410 and the cooling fluid can be maintained well, and the cooling efficiency of the liquid crystal panel 4410 can be further improved.
Further, since the opening 4404D of the first frame-like member 4404 is blocked by the translucent substrate 4430 of the viewing angle correction plate 443, the heat generated in the viewing angle correction film 4431 by the light beam emitted from the light source device 411 is absorbed. The viewing angle correction film 4431 through the translucent substrate 4430 through the heat transfer path of the cooling fluid inside the fluid sealing chamber R can dissipate heat, improve the cooling efficiency of the viewing angle correction plate 443, and heat the viewing angle correction plate 443. Deterioration can be prevented. For this reason, the lifetime of the projector 1 can be extended. Further, the member for installing the viewing angle correction plate 443 inside the projector 1 can be omitted, and the cost and size of the projector 1 can be reduced.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
In the embodiment, the configuration of the focus adjustment device 4402 is not limited to the configuration described in the embodiment. For example, as the focus adjustment device 4402, a pair of frame-like members each having an opening corresponding to an image forming area of the liquid crystal panel 4410, a pair of translucent substrates that respectively close the openings of each frame-like member, It is comprised with the bellows which connects the outer periphery edge of a frame-shaped member. And each opening of each frame-shaped member is respectively closed by a pair of translucent substrates, and the outer peripheral side of each frame-shaped member is covered with a bellows, so that a cooling fluid can be sealed between the pair of frame-shaped members. The fluid enclosure chamber is formed. And the volume of a fluid enclosure chamber is changed by expanding and contracting a bellows and changing the relative position of a pair of frame-shaped member.

In the above-described embodiment, the focus adjustment device 4402 supports and fixes the light modulation device 441 by the fixing screw 449 and is fixed to the light beam incident side end surface of the cross dichroic prism 440, but is not limited thereto. The focus adjustment device 4402 may be disposed between the light modulation device 441 and the projection lens 45, and may adopt a configuration that does not support the light modulation device 441 or a configuration that is not fixed to the cross dichroic prism 440. Good.
Further, the support structure of the light modulation device 441 by the focus adjustment device 4402 is not limited to the support structure by the fixing screw 449, and the light modulation device 441 with respect to the first frame-like member 4404 by another support structure, for example, an adhesive or the like. A structure may be adopted in which these are bonded and fixed.

In the embodiment, each adjustment screw 4409 is screwed into each screw hole 4404F of the first frame-like member 4404, and the tip portion is inserted into each fixing hole 4405D of the second frame-like member 4405. The structure in which the second frame-like member 4405 is sandwiched between the two nuts 4409A fixed to the above is adopted, but the present invention is not limited to this, and the following configuration may be adopted.
For example, the adjustment screw 4409 is screwed into both the screw hole 4404F of the first frame member 4404 and the fixing hole 4405D of the second frame member 4405, respectively. At this time, the screw hole 4404F and the fixing hole 4405D are screwed differently, for example, a right screw screw structure and a left screw screw structure. If comprised in this way, by rotating the adjustment screw 4409, the advancing / retreating direction of the first frame-like member 4404 and the second frame-like member 4405 will be reversed, and the first frame-like member 4404 and the second frame-like member will be reversed. The relative position of 4405 is changed.
The number of adjusting screws 4409 is not limited to four, and may be one, two, or three.

In the above-described embodiment, the first protrusion 4404B and the second protrusion 4405B have a circular frame shape in plan view. However, the present invention is not limited to this, and any shape that surrounds each of the openings 4404D and 4405C in a plane can be used. Any shape may be sufficient. For example, it may be formed in a rectangular frame shape.
In the embodiment, the attachment portion 4404C has a shape protruding from each end edge of the first plate body 4404A. However, the shape is not limited to this, and the shape protrudes from at least one of the end edges. Also good.

In the embodiment, the inflow port 4405E and the outflow port 4405F are not limited to the formation positions described in the embodiment, and other formation positions may be adopted. For example, a configuration may be adopted in which the flow direction of the cooling fluid is reversed so that each inlet 4405E and each outlet 4405F function as an outlet and an inlet, respectively.
In the above-described embodiment, the configuration in which the optical device 44 includes the main tank 445, the fluid pumping unit 446, and the radiator 447 has been described. However, the configuration is not limited thereto, and the main tank 445, the fluid pumping unit 446, and the radiator 447 A configuration in which at least one of them is omitted may be adopted.
In the embodiment, the focus adjustment device 4402 has a function of performing the focus adjustment of the liquid crystal panel 4410 and a function of cooling the liquid crystal panel 4410 and the viewing angle correction plate 443 by the cooling fluid inside the fluid sealing chamber R. However, it suffices to have at least a function for performing focus adjustment.

  In the embodiment, the viewing angle correction plate 443 is used as the optical conversion element. However, the present invention is not limited to this, and a retardation plate, a polarizing plate, or the like may be used. For example, a configuration in which the opening 4405C of the second frame-shaped member 4405 is closed not by the light-transmitting substrate 4406 but by the light-transmitting substrate 4440 of the emission-side polarizing plate 444 may be employed. In addition, for example, a configuration in which the opening 4404D of the first frame-like member 4404 is blocked by the light-transmitting substrate 4440 of the emission side polarizing plate 444 and the viewing angle correction film 4431 is pasted on the polarizing film 4441 may be employed. .

  In each of the above embodiments, the fluid circulating member 448, the main tank 445, the fluid pumping portion 446, the fluid branching portion 4401, the first frame-like member 4404, the second frame-like member 4405, and the fluid, which are members in contact with the cooling fluid Although the sending-in part 4403 was comprised from the member made from aluminum, it is not restricted to this. As long as the material has corrosion resistance, it is not limited to aluminum but may be composed of other materials, for example, oxygen-free copper or duralumin. In addition, as the fluid circulation member 448, butyl rubber or fluorine rubber having a low deformation reaction force to the focus adjusting device 4402 and low hardness may be used.

In the above-described embodiment, the flow rate of the cooling fluid flowing into each focus adjustment device 4402 is set to be substantially the same. However, the flow rate is not limited to this, and the flow rate of the cooling fluid flowing into each focus adjustment device 4402 is different. A configuration may be adopted.
For example, a configuration may be employed in which a valve is provided in a flow path flowing from the fluid branching portion 4401 to each focus adjustment device 4402 and the flow path is narrowed or widened by changing the position of the valve.
Further, for example, a configuration may be adopted in which each fluid circulation member 448 that connects the fluid branching portion 4401 and each focus adjustment device 4402 has a different tube diameter according to each light modulation device 441R, 441G, 441B.

In the embodiment, the sirocco fan 31 may be omitted. Such a configuration can contribute to noise reduction.
In the embodiment, the method for manufacturing the projector 1 is not limited to the flow shown in FIG. For example, in the processing S13, when assembling the optical device main body 44A, alignment adjustment of the liquid crystal panel 4410 is performed in a state where the cooling fluid is not filled. Specifically, the light beam is emitted to the liquid crystal panel 4410, and the light beam that has passed through the cross dichroic prism 440 is directly imaged by an imaging element such as a CCD. Then, based on the captured image, the focus adjustment device 4402 is moved in the same manner as in the process S42 to perform alignment adjustment. Thereafter, the focus adjustment device 4402 is fixed to the cross dichroic prism 440 in the same manner as the processing S43. And the process S14, S2, S3, S41, S43, S44, S5 is implemented in the state filled with the cooling fluid.
In the above-described embodiment, the position adjusting jig (not shown) has a structure for rotating each adjusting screw 4409. However, the present invention is not limited to this, and a structure without the above structure may be adopted. At this time, when the focus adjustment is performed in step S41, each adjustment screw 4409 is directly operated. With such a configuration, the structure of the position adjusting jig can be further simplified.

In the above-described embodiment, the configuration in which the optical unit 4 has a substantially L shape in plan view has been described. However, the configuration is not limited thereto, and for example, a configuration having a substantially U shape in plan view may be employed.
In the above embodiment, only the example of the projector 1 using the three liquid crystal panels 4410 has been described. However, the present invention is a projector using only one liquid crystal panel, a projector using only two liquid crystal panels, or 4 The present invention can also be applied to a projector using two or more liquid crystal panels.
In the embodiment, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In the embodiment, a liquid crystal panel is used as the light modulation device, but a light modulation device other than liquid crystal such as a device using a micromirror may be used. In this case, polarizing plates on the light beam incident side and the light beam emission side can be omitted.
In the above embodiment, only the example of the front type projector that projects from the direction of observing the screen is given. However, the present invention is also applicable to a rear type projector that projects from the side opposite to the direction of observing the screen. Is possible.

Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  The projector of the present invention is useful as a projector used in a home theater or a presentation because the structure of the position adjustment device for adjusting the position of the light modulation device can be simplified.

FIG. 2 is a diagram schematically showing a schematic configuration of a projector in the embodiment. The perspective view which looked at a part in the projector in the said embodiment from the upper side. The perspective view which looked at a part in the projector in the said embodiment from the downward side. The disassembled perspective view which shows schematic structure of the optical apparatus main body in the said embodiment. The perspective view which looked at the 1st frame-shaped member in the embodiment from the light beam emission side. The figure for demonstrating the cooling structure of the light modulation apparatus and viewing angle correction plate in the said embodiment. 6 is a flowchart for explaining a projector manufacturing method according to the embodiment. Sectional drawing which shows the movement state of the 2nd frame-shaped member by rotation of the adjustment screw in the said embodiment. The schematic diagram which shows a mode that the focus adjustment of a liquid crystal panel is implemented by changing the optical path length of the light beam which passes through the cooling fluid in the fluid enclosure room | chamber interior in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 45 ... Projection lens (projection optical apparatus), 411 ... Light source device, 440 ... Cross dichroic prism (color synthesis optical apparatus), 441, 441R, 441G, 441B ... Light Modulator, 443 ... Viewing angle correction plate (optical conversion element), 448 ... Fluid circulation member, 4402 ... Focus adjustment device, 4404 ... First frame member, 4404A ... First plate Body, 4404B ... first protrusion, 4404C ... mounting portion, 4404D ... opening, 4404F ... screw hole, 4405 ... second frame member, 4405A ... second plate, 4405B ... 2nd protrusion part, 4405C ... Opening, 4405D ... Fixing hole, 4405E ... Inlet, 4405F ... Outlet, 4409 ... Adjustment screw (screwing member), 4 30 ... light transmitting substrate, 4431 ... viewing angle compensation film (optical conversion film), R ... fluid-filled chamber.

Claims (8)

A projector comprising: a light source device; a light modulation device that modulates a light beam emitted from the light source device according to image information; and a projection optical device that enlarges and projects the light beam modulated by the light modulation device. ,
A focus adjusting device that is disposed in an optical path between the light modulation device and the projection optical device and has a fluid sealing chamber that allows fluid to be sealed inside;
The focus adjustment device is configured to be capable of changing a volume of the fluid enclosure chamber, changes an optical path length of a light beam passing through the fluid enclosed in the fluid enclosure chamber, and is placed at a back focus position of the projection optical device. A projector characterized by positioning a light modulation device. The projector according to claim 1, wherein
The focus adjusting device includes a first frame-like member and a second frame-like member that each have an opening that allows the light beam to pass therethrough, and are disposed opposite to each other, and each of the first frame-like member and the second frame-like member. A pair of translucent substrates that respectively close the openings; and a screwing member that connects the first frame-shaped member and the second frame-shaped member;
The first frame-shaped member protrudes from a plate-shaped first plate having a hole through which the screwing member can be inserted and the opening, and an end surface of the first plate facing the second frame-shaped member. And a first projecting portion that planarly surrounds the opening,
The second frame-shaped member protrudes from a plate-shaped second plate having a hole through which the screwing member can be inserted and the opening, and an end surface of the second plate facing the first frame-shaped member. And a second projecting portion that surrounds the opening in a plan view and can be fitted into the first projecting portion,
In the fluid sealing chamber, each opening of the first frame-shaped member and the second frame-shaped member is closed by the pair of translucent substrates, and the first projecting portion and the second projecting portion are fitted. Formed between the first frame-shaped member and the second frame-shaped member,
The screwing member is screwed into at least one of the holes of the first frame-like member and the second frame-like member, and the screwing state with the hole is changed to change the first screw-like member. A projector characterized in that a relative position between a frame-shaped member and the second frame-shaped member is changed to change a volume of the fluid sealing chamber. The projector according to claim 2,
The projector is characterized in that the screwing member includes at least three screw members. In the projector according to claim 2 or 3,
The projector is characterized in that the first frame member is fixed to a predetermined position inside the projector on the light beam incident side with respect to the second frame member, and supports the light modulation device. The projector according to any one of claims 2 to 4,
A plurality of the light modulation devices are provided,
A plurality of the focus adjustment devices are provided corresponding to the plurality of light modulation devices,
A color synthesizing optical device that synthesizes the light beams modulated by the plurality of light modulation devices;
The first frame member is disposed on the light beam incident side with respect to the second frame member, protrudes from the edge of the first plate to the light beam emission side, and moves the focus adjustment device to the light beam incident side of the color synthesizing optical device. It has a mounting part for mounting on the end face,
The plurality of light modulation devices are respectively supported by the first frame-like members of the plurality of focus adjustment devices, and are respectively fixed to the plurality of light beam incident side end surfaces of the color synthesis optical device via the plurality of focus adjustment devices. The projector characterized by being made. In the projector according to claim 4 or 5,
The projector is characterized in that the first frame-like member is made of a heat conductive material and supports the light modulation device so that heat can be transferred. The projector according to claim 6, wherein
The focus adjustment device has an inflow port for allowing fluid to flow into the fluid enclosure chamber, and an outflow port for causing fluid in the fluid enclosure chamber to flow out to the outside,
A projector, comprising: a plurality of fluid circulation members connected to an inlet and an outlet of the focus adjusting device, for guiding a fluid to the outside of the fluid enclosure chamber and guiding the fluid to the inside of the fluid enclosure chamber again. The projector according to any one of claims 2 to 7,
Including at least one optical conversion element disposed in an optical path between the light modulation device and the projection optical device and converting an optical characteristic of an incident light beam;
The optical conversion element is composed of a translucent substrate and an optical conversion film that is formed on the translucent substrate and converts optical characteristics of incident light flux,
The projector according to claim 1, wherein at least one of the pair of translucent substrates constituting the focus adjustment device is a translucent substrate constituting the optical conversion element.

Images