JP5505705B2 - Display element adjustment mechanism and projector - Google Patents

Description

  The present invention relates to a display element adjustment mechanism and a projector incorporating the display element adjustment mechanism.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen. This projector condenses light emitted from a light source on a display element such as a DMD (digital micromirror device) or a liquid crystal plate, and displays a color image on a screen.

  Therefore, in a DLP projector, if the DMD is attached with an inclination with respect to the optical axis, the image projected on the screen will also be inclined. In addition, in a 3LCD projector, if the liquid crystal plate is mounted with an inclination, an appropriate image cannot be projected on the screen without overlapping with the image light of other liquid crystal plates.

  Therefore, various adjustment mechanisms for attaching display elements such as DMDs and liquid crystal plates have been proposed. For example, in Japanese Patent Application Laid-Open No. 2001-13602 (Patent Document 1), an outer frame that holds a display element, first biasing means that presses the display element against the mounting surface, and a display element in a direction parallel to the mounting surface. A second urging means for urging, a first adjusting screw for pressing two places on one side of the display element against the urging force of the second urging means, and an inclined surface in contact with both ends of the one side. There has been proposed a display element adjustment mechanism including a tapered member and a second adjustment screw that presses the taper member from the same direction as the first adjustment screw.

JP 2001-13602 A

  The display element adjustment mechanism described in the above-mentioned patent document can adjust the vertical and horizontal directions and the inclination of the display element with a plurality of adjustment screws, but has a large number of parts and a complicated configuration, so that it takes time to assemble. There was a problem.

  The present invention has been made in view of the above-described problems of the prior art, and a display element adjustment mechanism having a simple structure capable of easily adjusting and mounting an angle of a display element such as a DMD or a liquid crystal plate. And a projector incorporating this display element adjustment mechanism.

The display element adjustment mechanism of the present invention includes a lens side holding member having an arcuate lens side engaging portion centering on the optical axis of the lens, and an element holding member for holding the display element, and the element holding member Has an arc-shaped element side engaging portion that is movable in the circumferential direction in a state of being engaged with the lens side engaging portion of the lens side holding member, and the element holding member is connected to the element side engaging portion. It is attached to the lens side holding member in a state where the joint portion and the lens side engaging portion are engaged, and the element side engaging portion is on a center line that bisects the width direction of the display element, and The display element is characterized by an arc shape centered on the upper side or the vicinity of the upper side .

  The projector of the present invention includes a display element, a light source unit, a light guide optical system that guides light from the light source unit to the display element, and a projection that projects an image emitted from the display element onto a screen. A side optical system and projector control means for controlling the light source unit and the display element, wherein the display element is held by an element holding member of the display element adjustment mechanism.

  According to the present invention, there are provided a display element adjustment mechanism having a simple structure capable of easily adjusting and mounting an angle of a display element such as a DMD or a liquid crystal plate, and a projector incorporating the display element adjustment mechanism. be able to.

1 is an external perspective view showing a projector according to an embodiment of the invention. It is a functional circuit block diagram of the projector which concerns on the Example of this invention. 1 is a schematic plan view showing an internal structure of a projector according to an embodiment of the invention. It is a perspective view of the optical system unit which concerns on the Example of this invention. It is a disassembled perspective view of the optical system unit which concerns on the Example of this invention. It is a schematic diagram which shows the positional relationship of the display element which concerns on the Example of this invention, and the lens of a projection side optical system. It is a schematic diagram which shows the display element before and behind angle adjustment by the display element adjustment mechanism based on the Example of this invention.

  Hereinafter, modes for carrying out the present invention will be described. The projector 10 projects a display element 51, a light source unit 60, a light guide optical system 170 that guides light from the light source unit 60 to the display element 51, and an image emitted from the display element 51 on the screen 300. A projection-side optical system 220; and a projector control unit that controls light emission of the blue light source device 70 and the red light source device 120 of the light source unit 60 and the display element 51.

  The light source unit 60 includes a blue light source device 70, a fluorescent light emitting device 100, a red light source device 120, and a light source side optical system 140. The blue light source device 70 includes a plurality of blue light sources 71 that are semiconductor light emitting elements that emit light in the blue wavelength band. The red light source device 120 includes a red light source 121 that is a semiconductor light emitting element that emits light in the red wavelength band.

  The fluorescent light emitting device 100 includes a diffusion transmission region that diffuses and transmits the light emitted from the blue light source device 70, and a green phosphor that emits green wavelength band light upon receiving the light emitted from the blue light source device 70. A fluorescent wheel 101 having a fluorescent light emitting region in which a layer is formed, and a wheel motor 110 that rotationally drives the fluorescent wheel 101 are provided. The fluorescent light emitting device 100 is disposed on the optical axis of the light emitted from the blue light source device 70.

  That is, the blue light source device 70 can sequentially irradiate light in the blue wavelength band to the diffuse transmission region and the fluorescence emission region of the rotating fluorescent wheel 101. Therefore, when light in the blue wavelength band is irradiated to the diffuse transmission region of the rotating fluorescent wheel 101, light in the blue wavelength band is diffused and transmitted, and when light in the blue wavelength band is irradiated to the fluorescence emission region, green fluorescence is emitted. Light in the green wavelength band is emitted from the body.

  Further, the light source side optical system 140 is a light tunnel 175 that is a predetermined surface for the blue and green wavelength band light emitted from the fluorescent light emitting device 100 and the red wavelength band light emitted from the red light source device 120. It consists of a lens, a mirror, etc. that collects light at the entrance. That is, the blue and green light emitted from the fluorescent light emitting device 100 and the red light emitted from the red light source device 120 are collected by the light source side optical system 140 at the entrance of the light tunnel 175.

  Further, each color light collected in the light tunnel 175 is guided to the display element 51 by the light guide optical system 170 in the optical system unit 160.

  The display element 51 generates an image by bright display by reflection in the front direction and dark display by reflection in an oblique direction. Specifically, the display element 51 includes a micromirror array 53 in which a plurality of micromirrors are arranged in a matrix, and receives light incident from an incident direction inclined by a predetermined angle with respect to the front direction. By switching the tilt direction of a plurality of micromirrors, an image is displayed by being divided into an on-state light beam in the front direction and an off-state light beam in the oblique direction.

  The light incident on the micromirror array 53 is reflected in the front direction by the micromirror tilted in one tilt direction to be turned on, and reflected in the oblique direction by the micromirror tilted in the other tilt direction. It is assumed to be off-state light. This off-state light beam is absorbed by the light absorption plate.

The display element 51 sequentially emits image light of each color (red, green, and blue) that is an on-state light beam reflected in the front direction. The emitted image light is enlarged by the lens group of the projection side optical system 220 of the optical system unit 160 and projected onto the screen 300.

  That is, in the light source unit 60, the light source control unit in the projector control unit individually controls the light emission of the red light source device 120 and the blue light source device 70, so that the red, green, and blue wavelength band lights sequentially from the light source unit 60. Can be injected. Then, the DMD that is the display element 51 of the projector 10 displays each color light in a time-sharing manner according to the data, so that a color image can be generated on the screen 300.

  The display element 51 is adjusted to a predetermined angle by the display element adjustment mechanism and attached to the image generation block 165 of the optical system unit 160. The display element adjustment mechanism includes an element holding member 52 that holds the display element 51, and an image generation block 165 that is a lens side holding member to which the element holding member 52 is attached.

  The element holding member 52 is formed in an arc shape that is on the center line that bisects the width direction of the micromirror array 53 in the display element 51 and that is centered on the upper side or the vicinity of the upper side of the micromirror array 53 in the display element 51. The element side engaging portion 56 is provided. Further, the element side engaging portion 56 is a convex portion protruding toward the image generation block 165 side.

  On the surface to which the element holding member 52 of the image generation block 165 is attached, an arc-shaped lens side engagement portion 65 centering on the optical axis of the lens group disposed in the image generation block 165 or the projection side block 168. have. The lens side engaging portion 65 is a recess.

  The lens side engaging portion 65 and the element side engaging portion 56 are formed so as to be engageable with each other. The lens side engaging portion 65 is formed so that the central portion on the arc is arranged on the lower side, and further, the upper side of the left and right upper ends of the lens side engaging portion 65 is opened. An opening 65a is formed on the upper surface of 165.

  Therefore, the display element adjusting mechanism slides the element side engaging portion 56 in the circumferential direction in a state where the element side engaging portion 56 is engaged with the lens side engaging portion 65, thereby attaching the display element 51 to the mounting angle. After adjusting the mounting angle, the display element 51 held by the element holding member 52 can be attached to the image generation block 165 that is the lens side holding member at a predetermined angle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view of the projector 10. In this embodiment, left and right in the projector 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projector 10 and the front and rear direction with respect to the traveling direction of the light beam.

  As shown in FIG. 1, the projector 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a front side plate of the projector housing. The panel 12 is provided with a plurality of intake holes 18. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  In addition, a key / indicator unit 37 is provided on the top panel 11 of the housing. The key / indicator unit 37 switches a power switch key, a power indicator for notifying power on / off, and switching on / off of projection. Keys and indicators such as an overheat indicator for notifying when a projection switch key, a light source unit, a display element, a control circuit, etc. are overheated are arranged.

  In addition, on the rear surface of the housing, there are provided various terminals 20 such as an input / output connector section and a power adapter plug that provide a USB terminal, a D-SUB terminal for image signal input, an S terminal, an RCA terminal, etc. on the rear panel. Yes. A plurality of intake holes 18 are formed in the back panel. A plurality of exhaust holes 17 are formed in each of the right panel, which is a side plate of the housing (not shown), and the left panel 15, which is the side plate shown in FIG. An intake hole 18 is also formed in a corner of the left panel 15 near the back panel.

  Next, projector control means of the projector 10 will be described with reference to the functional block diagram of FIG. The projector control means includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. The control unit 38 controls the operation of each circuit in the projector 10, and is composed of a ROM in which operation programs such as a CPU and various settings are fixedly stored, a RAM used as a work memory, and the like. Yes.

  Then, the image signal of various standards input from the input / output connector unit 21 by the projector control means is in a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted so as to be unified into an image signal, it is output to the display encoder 24.

  The display encoder 24 develops and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

  The display drive unit 26 functions as display element control means, and drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. By irradiating the display element 51 with a light bundle emitted from the light source unit 60, that is, a light bundle condensed on a predetermined surface by the light source side optical system of the light source unit 60, through the light guide optical system. Then, an optical image is formed by the reflected light of the display element 51, and the image is projected and displayed on a screen (not shown) via a projection side optical system described later. The movable lens group 235 of the projection side optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman coding, and sequentially written in a memory card 32 that is a detachable recording medium. Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, decompresses individual image data constituting a series of moving images in units of one frame, and converts the image data into the image conversion unit 23. Is output to the display encoder 24 and the processing for enabling the display of a moving image or the like based on the image data stored in the memory card 32 is performed.

  Then, an operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the top panel 11 of the housing is directly sent to the control unit 38, and a key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is output to the control unit 38.

  Note that an audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts the sound data into analog in the projection mode and the playback mode, and drives the speaker 48 to emit loud sounds.

  Further, the control unit 38 controls a light source control circuit 41 as a light source control unit, and the light source control circuit 41 is configured so that light source light of a predetermined wavelength band required at the time of image generation is emitted from the light source unit 60. In addition, the light emission of the blue light source device and the light emitting element of the red light source device of the light source unit 60 are individually controlled, and the wheel motor is controlled to rotate the fluorescent wheel of the fluorescent light emitting device.

  Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source unit 60 and the like, and individually controls the rotation speeds of the plurality of cooling fans from the result of the temperature detection. Let Further, the control unit 38 causes the cooling fan drive control circuit 43 to keep the cooling fan rotating even after the projector body is turned off by a timer or the like, or to turn off the projector body depending on the result of temperature detection by the temperature sensor. Control is also performed.

  Next, the internal structure of the projector 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 10, and FIG. 4 is a perspective view of the optical system unit 160 mounted on the projector 10. As shown in FIG. 3, the projector 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power circuit block, a light source control block, and the like. In addition, the projector 10 includes a light source unit 60 on the side of the control circuit board 241, that is, at a substantially central portion of the projector housing. Further, the projector 10 includes an optical system unit 160 between the light source unit 60 and the left panel 15.

  The light source unit 60 includes a blue light source device 70 disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector housing, and an optical axis of a light beam emitted from the blue light source device 70. A fluorescent light emitting device 100 disposed in the vicinity of the front panel 12, a red light source device 120 disposed between the blue light source device 70 and the fluorescent light emitting device 100, light emitted from the fluorescent light emitting device 100, and a red light source device 120 A light source side optical system 140 that converts the optical axes of the emitted light from the light source to the same optical axis and collects each color light at the entrance of the light tunnel 175 that is a predetermined surface.

  The blue light source device 70 is a light source group composed of a plurality of blue light sources 71 arranged so that the optical axis is parallel to the rear panel 13, and converts the optical axis of the emitted light from each blue light source 71 by 90 degrees in the direction of the front panel 12. A plurality of reflecting mirrors 75, a condenser lens 78 that condenses the light emitted from each blue light source 71 reflected by the plurality of reflecting mirrors 75, and a heat sink 81 disposed between the blue light source 71 and the right panel 14. And a cooling fan 261a.

  The light source group includes blue light sources 71, which are semiconductor light emitting elements that emit light in the blue wavelength band, arranged in a matrix. Further, as the blue light source 71, it is preferable to employ a laser emitter capable of emitting a light beam with high directivity. Further, on the emission side of each blue light source 71 on the optical axis of each blue light source 71, there is a collimator lens 73 that is a condensing lens that converts parallel light so as to enhance the directivity of the emitted light from each blue light source 71. Each is arranged. The plurality of reflection mirrors 75 are arranged in a stepped manner, and the cross-sectional area of the light beam emitted from the light source group is reduced in the horizontal direction by narrowing the interval between the light source light beams emitted from the respective blue light sources 71. Then, the light is reflected toward the condenser lens 78.

  A cooling fan 261a is disposed between the heat sink 81 and the back panel 13, and the blue light source 71 is cooled by the cooling fan 261a and the heat sink 81. Further, a cooling fan 261a is also disposed between the reflection mirror 75 and the back panel 13, and the reflection mirror 75, the condenser lens 78, and the blue light source 71 are cooled by the cooling fan 261a.

  Fluorescent light emitting device 100 is arranged to be parallel to front panel 12, that is, fluorescent wheel 101 arranged so as to be orthogonal to the optical axis of light emitted from blue light source device 70, and rotationally drives this fluorescent wheel 101 A wheel motor 110, a condensing lens group 111 that condenses the light bundle emitted from the blue light source device 70 on the fluorescent wheel 101 and condenses the light bundle emitted from the fluorescent wheel 101 toward the rear panel 13, and a fluorescent light And a condensing lens 115 that condenses the light bundle emitted from the wheel 101 toward the front panel 12.

  The fluorescent wheel 101 receives the emission light from the blue light source device 70 as excitation light and emits the fluorescent light emission in the green wavelength band, and the diffuse transmission region that diffuses and transmits the emission light from the blue light source device 70 Are arranged side by side in the circumferential direction. Further, the base material in the green fluorescent light emitting region is a metal base material made of copper, aluminum or the like, and the surface of the base material on the back panel 13 side is mirror processed by silver vapor deposition or the like. A green phosphor layer is laid on the surface. Furthermore, the base material in the diffuse transmission region is a transparent base material having translucency, and fine irregularities are formed on the surface of the base material by sandblasting or the like.

  The light emitted from the blue light source device 70 irradiated on the green phosphor layer of the phosphor wheel 101 excites the green phosphor in the green phosphor layer, and the light bundle emitted in all directions from the green phosphor is The light is directly reflected to the rear panel 13 side or reflected from the surface of the fluorescent wheel 101 and then emitted to the rear panel 13 side and enters the condenser lens group 111. Further, the light emitted from the blue light source device 70 irradiated on the diffuse transmission region of the fluorescent wheel 101 enters the condensing lens 115 as diffuse transmission light diffused by the fine unevenness. A cooling fan 261b is disposed between the wheel motor 110 and the front panel 12, and the fluorescent light emitting device 100 and the like are cooled by the cooling fan 261b.

  The red light source device 120 is a monochromatic light emitting device including a red light source 121 arranged so that the optical axis is parallel to the blue light source 71, and a condensing lens group 125 that collects light emitted from the red light source 121. is there. The red light source 121 is a light emitting diode that emits light in the red wavelength band. The red light source device 120 is arranged so that the light axis from the blue light source device 70 and the green wavelength band light emitted from the fluorescent wheel 101 intersect the optical axis. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121. A cooling fan 261c is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261c.

  The light source side optical system 140 includes a condenser lens that condenses the light bundles in the red, green, and blue wavelength bands, and a reflection mirror that converts the optical axes of the light bundles in the respective color wavelength bands into the same optical axis, It consists of a dichroic mirror. Specifically, at the position where the blue wavelength band light emitted from the blue light source device 70 and the green wavelength band light emitted from the fluorescent wheel 101 and the red wavelength band light emitted from the red light source device 120 intersect, A first dichroic mirror 141 that transmits blue and red wavelength band light, reflects green wavelength band light, and converts the optical axis of the green light by 90 degrees toward the left panel 15 is disposed.

  Also, on the optical axis of the blue wavelength band light diffusely transmitted through the fluorescent wheel 101, that is, between the condenser lens 115 and the front panel 12, the blue wavelength band light is reflected and the optical axis of this blue light is on the left side. A first reflecting mirror 143 that converts 90 degrees in the direction of the panel 15 is disposed. Further, on the optical axis of the blue wavelength band light reflected by the first reflection mirror 143 and in the vicinity of the optical system unit 160, a second reflection mirror for converting the optical axis of the blue light by 90 degrees in the direction of the back panel 13 145 is arranged.

  Further, the optical axis of the red wavelength band light transmitted through the first dichroic mirror 141, the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 so as to coincide with this optical axis, and the second reflection mirror 145 At the position where the optical axis of the reflected blue wavelength band light intersects, the blue wavelength band light is transmitted, the red and green wavelength band light is reflected, and the optical axes of the red and green light are 90 degrees toward the rear panel 13. A second dichroic mirror 148 for changing the degree is arranged. A condensing lens is disposed between the dichroic mirror and the reflecting mirror. Further, in the vicinity of the light tunnel 175, a condenser lens 173 for condensing the light source light at the entrance of the light tunnel 175 is disposed.

  As shown in FIGS. 3 and 4, the optical system unit 160 is an image located in the vicinity of the position where the illumination side block 161 located on the left side of the blue light source device 70 intersects the back panel 13 and the left panel 15. The generation block 165 and the projection side block 168 positioned between the light source side optical system 140 and the left panel 15 are configured in a substantially U shape.

  The illumination side block 161 includes a part of a light guide optical system 170 that guides the light source light emitted from the light source unit 60 to the display element 51 provided in the image generation block 165. As the light guide optical system 170 included in the illumination side block 161, the light tunnel 175 that uses the light flux emitted from the light source unit 60 as a light flux having a uniform intensity distribution, and the light emitted from the light tunnel 175 are collected. There are a condensing lens 178, an optical axis conversion mirror 181 that converts the optical axis of the light beam emitted from the light tunnel 175 in the direction of the image generation block 165, and the like.

  As the light guide optical system 170, the image generation block 165 has a condensing lens 183 that condenses the light source light reflected by the optical axis conversion mirror 181 on the display element 51, and a light beam transmitted through the condensing lens 183 as a display element. And an irradiation mirror 185 that irradiates 51 at a predetermined angle. An element holding member 52 for holding a display element (DMD) 51 is attached to the image generation block 165. Further, a condensing lens 195 as the projection-side optical system 220 is disposed in the vicinity of the front surface of the display element 51. A heat sink 190 for cooling the display element 51 is disposed between the display element 51 and the back panel 13, and the display element 51 is cooled by the heat sink 190.

  The display element 51 is a display element that generates an image by bright display by reflection in the front direction and dark display by reflection in an oblique direction. Specifically, the display element 51 includes a micromirror array in which a plurality of micromirrors are arranged in a matrix, and a plurality of light incident from an incident direction inclined by a predetermined angle with respect to the front direction is received. By switching the tilt direction of the micromirror, the image is displayed by being divided into an on-state light beam in the front direction and an off-state light beam in the oblique direction.

  The light incident on the micromirror array is reflected in the front direction by the micromirror tilted in one tilt direction to be turned on, and reflected off in the diagonal direction by the micromirror tilted in the other tilt direction. State beam. This off-state light beam is absorbed by the light absorption plate.

The display element 51 sequentially emits image light of each color (red, green, and blue) that is an on-state light beam reflected in the front direction. The emitted image light is enlarged and projected onto a screen by a lens group disposed in the projection side block 168 in the optical system unit 160.

  The projection-side block 168 has a lens group of the projection-side optical system 220 that emits ON light reflected by the display element 51 to the screen. The projection-side optical system 220 includes a fixed lens group 225 built in a fixed lens barrel and a movable lens group 235 built in a movable lens barrel, and is a variable focus lens having a zoom function, and is movable by a lens motor. Zoom adjustment and focus adjustment can be performed by moving the lens group 235.

  By configuring the projector 10 in this manner, when the fluorescent wheel 101 is rotated and light is emitted from the blue light source device 70 and the red light source device 120 at different timings, red, green, and blue wavelength band lights are emitted from the light source side optical system. Since the light is sequentially incident on the light tunnel 175 via 140 and further on the display element 51 via the light guide optical system 170, the DMD which is the display element 51 of the projector 10 time-divides each color light according to the data. By displaying, a color image enlarged through the lens group can be generated on the screen.

  Next, a specific configuration of the display element adjustment mechanism that adjusts the mounting angle of the display element 51 will be described with reference to FIGS. FIG. 5 is an exploded perspective view of the optical system unit 160 according to the present embodiment. FIG. 6 is a schematic diagram showing the positional relationship between the display element 51 and the lens of the projection-side optical system 220 according to the present embodiment. FIG. 7 is a schematic diagram showing the display element 51 before and after angle adjustment by the display element adjustment mechanism according to the present embodiment. 7 is a cross-sectional view of the engaging portion between the element side engaging portion 56 and the lens side engaging portion 65, and only the lens side engaging portion 65 of the lens side holding member is indicated by a two-dot chain line. ing.

  As shown in FIG. 5, the display element adjustment mechanism includes an element holding member 52 that holds the display element 51, and an image generation block 165 that is a lens side holding member to which the element holding member 52 is attached. . The display element 51 is electrically connected to the circuit of the substrate 58 by being attached to the DMD socket 55. The substrate 58 is held by a reinforcing plate 59, and the reinforcing plate 59 is attached to the heat sink 190. Here, the micro mirror array 53 in the display element 51 may be mounted slightly inclined with respect to the mirror holding portion 54 (DMD package) due to manufacturing errors.

  The element holding member 52 has an arc shape centered on a point O at which the center line that bisects the width direction of the micromirror array 53 in the display element 51 and the upper side of the micromirror array 53 in the display element 51 intersect. The formed element side engaging portion 56 is provided. Further, the element side engaging portion 56 is a convex portion protruding toward the image generation block 165 side.

  On the surface to which the element holding member 52 of the image generation block 165 is attached, an arc-shaped lens side engagement portion 65 centering on the optical axis of the lens group disposed in the image generation block 165 or the projection side block 168. Is formed. The lens side engaging portion 65 is a recess.

  The lens side engaging portion 65 and the element side engaging portion 56 are formed so as to be engageable with each other. Further, the lens side engaging portion 65 is formed so that the central portion on the arc is arranged on the lower side, and further, the upper side of the left and right upper ends of the lens side engaging portion 65 is opened. An opening 65a is formed on the upper surface of 165.

  Then, female thread portions 65b are provided at the four corners of the mounting surface of the image generation block 165, and mounting holes 52a are formed at the four corners of the element holding member 52. The screws 69 are screwed into the female thread portions 65b through the mounting holes 52a. The element holding member 52 is fixed to the image generation block 165 by being attached. The mounting hole 52a is formed as a clearance hole having a diameter larger than that of the screw 69.

  Accordingly, when the lens side engaging portion 65 and the element side engaging portion 56 are engaged, as shown in FIG. 6A, the lens side engaging portion 65 and the element side engaging portion 56 are disposed in the lens group of the projection optical system 220, that is, in the image generating block 165. On the optical axis of the lens group (fixed lens group 225 and movable lens group 235 shown in FIG. 3) arranged on the upper side of the micromirror array 53. The center point O to be positioned is located. Therefore, the enlarged image projected on the screen 300 through the lens group is positioned above the projector 10.

  As described above, the display element adjusting mechanism slides the element side engaging portion 56 in the circumferential direction in a state where the element side engaging portion 56 is engaged with the lens side engaging portion 65. The attachment angle can be adjusted, and after the attachment angle is adjusted, the display element 51 held by the element holding member 52 can be attached to the image generation block 165 that is the lens side holding member at a predetermined angle.

  That is, the display element 51 mounted on the mirror holding portion 54 (DMD package) is attached to the element holding member 52 with the micromirror array 53 slightly inclined, and the element holding member 52 is slid in the circumferential direction. In other words, when the display element 51 is attached to the image generation block 165 without adjusting the attachment angle, as shown in FIG. 7A, the convex portion which is the element side engaging portion 56 is the lens side engaging portion. Although the micromirror array 53 is fitted in the concave portion 65, the micromirror array 53 is disposed in a state inclined by θ with respect to the mirror holding portion 54 (DMD package) as described above.

  Here, the arcuate convex portion that is the element side engaging portion 56 is slid in the circumferential direction in a state where the arcuate convex portion that is the lens side engaging portion 65 is fitted in the circumferential direction, as shown in FIG. As described above, the angle of the micromirror array 53 can be adjusted. Since the upper end of the arcuate concave portion that is the lens side engaging portion 65 is an opening 65a, one end of the arcuate convex portion that is the element side engaging portion 56 protrudes upward from this opening.

  Then, the element holding member 52 is rotated so that the upper and lower sides of the micromirror array 53 are horizontal (that is, parallel to the upper panel and the lower panel of the projector 10), and the screw 69 is attached to the mounting hole 52a. The element holding member 52 is attached to the image generation block 165 while being tilted, but the micromirror array 53 is at a predetermined angle (ie, the upper side and the lower side are horizontal). It will be fixed and held.

  Note that the inclination θ due to manufacturing error is usually extremely small, but in the image projected on the screen 300 or the like, the difference in height between the left and right upper and lower ends is large even if the inclination angle is small. Thus, the quality of the projector 10 may be affected, such as making the viewer feel uncomfortable or making it difficult to see images such as projected characters.

  Therefore, according to the present invention, a display element adjustment mechanism having a simple structure capable of easily adjusting and arranging the mounting angle of the micromirror array 53 in the display element 51, and a display element adjustment mechanism having this simple structure are provided. By incorporating the projector 10, it is possible to provide the projector 10 having excellent assembly workability.

  Further, by forming the element side engaging portion 56 on a center line that bisects the width direction of the display element 51 and having an arc shape centering on the upper side of the display element 51, an image projected on the screen 300 is displayed. Can be positioned above the projector 10 and can be positioned above the projector 10, so that the projector 10 is capable of projecting an image that is easy to handle and easy for the viewer to see, and easily adjusts the micromirror array 53. It is possible to provide a projector 10 that can handle the above.

  Furthermore, by forming the element side engaging portion 56 as a convex portion protruding toward the image generation block 165, the element side engaging portion 56 can be easily fitted into the lens side engaging portion 65 which is a concave portion of the image generation block 165. It is possible to provide a display element adjusting mechanism capable of adjusting the mounting angle by easily sliding the element side engaging portion 56 in the circumferential direction in the combined state.

  The present invention is not limited to the above embodiments, and can be freely changed and improved without departing from the gist of the invention. For example, the display element adjustment mechanism is not limited to the configuration for adjusting the mounting angle of the DMD, and can be configured to adjust the mounting angles of various display elements that constitute the optical system. That is, in the above embodiment, the display element adjustment mechanism for adjusting the mounting angle of the display element (DMD) 51 in the DLP projector has been described. However, the display element adjustment mechanism is a liquid crystal plate (display element) in the 3LCD projector. The mounting angle can be adjusted. Further, the layout of each optical component is not limited to the above-described configuration (see FIG. 3), and various layouts can be adopted.

  The element side engaging portion 56 is formed as a concave portion and the lens side engaging portion 65 is formed as a convex portion without being limited to the case where the element side engaging portion 56 is formed as a convex portion and the lens side engaging portion 65 is formed as a concave portion. You can also Moreover, it is not limited to the case where the upper end of the engaging portion which is a concave portion is opened, and the end portion of the engaging portion which is a convex portion can be protruded upward from this open end, Instead of the configuration in which the upper end of the concave portion is opened, the arc length of the convex portion may be shortened with respect to the concave portion, and the convex portion may be slid in the circumferential direction within the concave portion.

  Furthermore, the element side engaging portion 56 is not limited to being formed in an arc shape centered on the point O on the upper side of the display element 51, but may be formed in an arc shape centering on the vicinity of the upper side. Even in such a case, as shown in FIGS. 6B and 6C, the enlarged image projected on the screen 300 can be positioned above the projector 10. Further, the element side engaging portion 56 may be formed in an arc shape centered on the center, the lower side, or the vicinity of the lower side of the display element 51. For example, when the projector 10 is installed on the ceiling, the element-side engagement portion 56 is formed in an arc shape centered on the lower side or the vicinity of the lower side of the display element 51, so that the image is enlarged and projected below the projector 10. can do.

10 Projector
11 Top panel 12 Front panel
13 Rear panel 14 Right panel
15 Left panel 17 Exhaust hole
18 Air intake hole 19 Lens cover
20 Various terminals 21 Input / output connector
22 I / O interface 23 Image converter
24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit
32 Memory card 35 Ir receiver
36 Ir processing section 37 Key / indicator section
38 Control unit 41 Light source control circuit
43 Cooling fan drive control circuit 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 52 Element holding member
52a Mounting hole
53 Micromirror array 54 Mirror holder
55 DMD socket 56 Element side engaging part
58 PCB
59 Reinforcement plate 60 Light source unit
65 Lens side engagement part 65a Opening
65b Female thread 69 thread
70 Blue light source device 71 Blue light source
73 Collimator lens 75 Reflective mirror
78 Condensing lens
81 Heat sink 100 Fluorescent light emitting device
101 Fluorescent wheel 110 Wheel motor
111 Condensing lens group 115 Condensing lens
120 Red light source 121 Red light source
125 condenser lens group 130 heat sink
140 Light source side optical system 141 First dichroic mirror
143 First reflection mirror 145 Second reflection mirror
148 Second dichroic mirror 160 Optical system unit
161 Lighting block 165 Image generation block
168 Projection side block 170 Light guiding optical system
173 Condensing lens 175 Light tunnel
178 Condensing lens 181 Optical axis conversion mirror
183 Condensing lens 185 Irradiation mirror
190 Heat sink 195 Condenser lens
220 Projection-side optical system 225 Fixed lens group
235 Movable lens group 241 Control circuit board
261a, b, c Cooling fan 300 screen

Claims (4)

A lens-side holding member having an arc-shaped lens-side engaging portion centered on the optical axis of the lens;
An element holding member for holding a display element,
The element holding member has an arc-shaped element side engaging portion that is movable in the circumferential direction in a state of being engaged with the lens side engaging portion of the lens side holding member. Attached to the lens side holding member in a state where the element side engaging portion and the lens side engaging portion are engaged ,
The display element, wherein the element-side engagement portion is on a center line that bisects the width direction of the display element and has an arc shape centering on the upper side or the vicinity of the upper side of the display element Adjustment mechanism. The display element adjustment mechanism according to claim 1, wherein the element side engaging portion is a convex portion, and the lens side engaging portion is a concave portion. The display element is a display element adjusting mechanism according to claim 1 or claim 2, characterized in that a DMD. A display element; a light source unit; a light guide optical system that guides light from the light source unit to the display element; a projection-side optical system that projects an image emitted from the display element onto a screen; and the light source unit. And a projector control means for controlling the display element,
The projector, wherein the display element is held by an element holding member of the display element adjustment mechanism according to any one of claims 1 to 3 .

Images