JP4654636B2 - Projector device for electronic equipment - Google Patents

Description

  The present invention relates to a projector device mounted on an electronic device that projects information such as an image and text.

  An electronic device in which a projector is mounted on a hand hold device such as a cellular phone is known (see Patent Document 1). The projector-equipped mobile phone described in Patent Document 1 projects information on the palm of the caller while calling, or projects information on the wall surface while calling. The projector includes a light valve composed of a liquid crystal panel and the like, and a light source that illuminates the light valve, and projects an image of light (modulated light) that has passed through the light valve. In order to obtain a bright projection image, it is necessary to supply a large current to the light source. However, since the amount of heat generation increases as the supply current increases, it is necessary to take heat dissipation measures to suppress the temperature rise of the device. A stationary projector employs a technique of cooling with a Peltier element, a fan, or the like, as described in Patent Document 2.

JP 2000-236375 A JP 2000-194275 A

  Adopting a heat dissipation method that uses a Peltier element or a fan for hand-held devices that are premised on battery operation will shorten the battery life (discharge time) or increase the size of the device as power consumption increases. It is difficult to invite.

According to a first aspect of the present invention , there is provided a projector device for mounting on an electronic device, wherein the first member is formed of a material having thermal conductivity and has a light emitting element disposed on a surface thereof, and modulates light from the light emitting element. A light valve, a projection optical system that projects an image of light modulated by the light valve, and a material having lower thermal conductivity than the first member, and at least the first member and the light valve are arranged. The second member to be provided is formed of the same material as the first member or a material having higher thermal conductivity than the second member, and integrally supports the second member and the projection optical system. And a third member in surface contact on at least one surface of the first member.

  According to the present invention, the light emitting element is disposed on the first member having thermal conductivity, the first member and the light valve are disposed on the second member having low thermal conductivity, and the second member and the projection optical system are disposed. Are integrally supported by the third member having thermal conductivity, and the first member and the third member are brought into surface contact with each other, so that heat from the light emitting element is dissipated from the first member and the third member. Made it difficult to reach the light valve. Accordingly, it is possible to provide a projector device for mounting on an electronic device that ensures heat dissipation without using a Peltier element or the like and does not impair downsizing.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
1A and 1B are external views of a projector-equipped mobile phone used in handholding according to a first embodiment of the present invention, where FIG. 1A is a side view and FIG. 1B is a front view. The mobile phone 10 is provided with an antenna 11, a liquid crystal display 12, an operation member 13 including a dial button, a vent hole 14, and a projector projection port 20. The mobile phone 10 makes a call with another phone via a base station (not shown), and sends and receives mail and data. Moreover, the projector module mentioned later is mounted and the image currently displayed on the liquid crystal display 12, an incoming mail, etc. are projected toward the wall etc. from the projector projection port 20. FIG.

  Since the present invention has a feature in the configuration of the projector module mounted on the mobile phone 10, the following description will focus on the projector module.

  2A and 2B are three views of the projector module PJ. FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is a bottom view. The projector module PJ includes an optical block 40 and a light image forming block 30, and both are integrated by a fixing member 25. The fixing member 25 is obtained by bending a metal thin plate such as an aluminum plate, for example. The fixing member 25 has mounting portions 25A and 25B having screw fixing holes, and the projector module PJ is fixed to the casing of the mobile phone 10 using the mounting portions 25A and 25B.

  FIG. 3 is a cross-sectional view taken along the line GG ′ in FIG. The optical image forming block 30 is obtained by arranging a substrate 21 </ b> B on the optical image forming block housing 26. The casing 26 is formed of a material having low thermal conductivity such as plastic. The substrate 21B is an aluminum substrate, and a high-luminance white LED 21A is mounted on a pattern formed on an insulating layer on the LED mounting surface of the substrate 21B. The LED 21A illuminates the liquid crystal panel 22 with brightness according to the current supplied via the harness 21C. The liquid crystal panel 22 is configured by enclosing liquid crystals between glasses 22A and 22B. The liquid crystal panel 22 may be compatible with color display or monochrome display.

  The liquid crystal panel 22 is driven by a drive signal for reproducing an image or text supplied through the flexible substrate 21D. For example, if a drive signal similar to a display signal (drive signal) supplied to the liquid crystal display 12 is used as a drive signal for the liquid crystal panel 22, an image similar to the display content of the liquid crystal display 12 is formed on the liquid crystal panel 22. it can. Specifically, a voltage corresponding to the density of the image is applied to the liquid crystal layer for each pixel. In the liquid crystal layer to which a voltage is applied, the arrangement of liquid crystal molecules changes, and the light transmittance of the liquid crystal layer changes. Thus, the liquid crystal panel 22 generates an optical image by modulating the light from the LED 21A in accordance with the drive signal. The light beam transmitted through the liquid crystal panel 22 travels upward in FIG. 3 and enters the optical block 40.

  In the optical block 40, a polarizing beam splitter (hereinafter referred to as PBS) 23A and a reflecting member 23B are disposed in the optical block housing 24, and a quarter-wave plate 23λ is provided at the boundary between the PBS 23A and the reflecting member 23B. Is. The casing 24 is formed of a material having low thermal conductivity such as plastic.

  The light beam entering the optical block 40 enters the PBS 23A from the bottom of FIG. 3, and the S-polarized component of the incident light is reflected by the polarization separation unit 23P and travels to the left. The reflected light beam traveling leftward is emitted from the PBS 23A and reflected by the reflecting surface 23C of the reflecting member 23B via the quarter-wave plate 23λ. The reflected light beam enters the PBS 23A again through the quarter-wave plate 23λ. The light beam incident on the PBS 23A is converted into a P-polarized component by passing through the quarter-wave plate 23λ twice. Therefore, the light passes through the polarization separation unit 23P of the PBS 23A and proceeds rightward.

  The transmitted light beam traveling rightward is emitted from the PBS 23 </ b> A, travels rightward, and is projected from the projector projection port 20. Thereby, the optical image by the liquid crystal panel 22 is projected toward a screen or the like. The reflecting surface 23C is formed in a predetermined curved surface so that the projection lens can be omitted.

  As shown in FIGS. 2A to 2C, the fixing member 25 holds the optical image forming block 30 having a substantially rectangular parallelepiped shape on four sides. That is, in FIG. 2B, the corresponding surfaces of the optical image forming block 30 are joined so as to cover the optical image forming block 30 from the left, from the bottom, from the right, and from the upper side of the sheet. Of the surfaces of the fixing member 25 to be joined to the optical image forming block 30, holes 25X (FIG. 2 (a)) and holes are respectively formed on the surface facing in FIG. 2 (a) and the surface facing in FIG. 2 (b). 25Y (FIG. 2B). These holes 25X and 25Y are respectively associated with the protrusions 26X and 26Y provided on the housing 26 of the optical image forming block 30 in a state where the optical image forming block 30 is held between the fixing members 25. Configured to match. Thereby, the fixing member 25 and the optical image forming block 30 can be integrated without using screws or adhesives.

  Further, among the surfaces of the fixing member 25 to be joined to the optical image forming block 30, the surface facing directly in FIG. 2 (c) is particularly configured to be in surface contact with the bottom surface of the substrate 21B, and has a good thermal conductivity ( For example, bonding is performed after applying silicon grease. Further, a hole 25Z is provided on the surface of the fixing member 25 so as to expose a part of the substrate 21B in a state where the fixing member 25 holds the optical image forming block 30.

  In a state in which the fixing member 25 and the optical image forming block 30 are integrated, as shown in FIGS. 2A and 2B, the fixing member 25 holds the optical block 40 having a substantially rectangular parallelepiped shape between two surfaces. That is, in FIG. 2B, the optical block 40 is joined to the surface from the left and right. The optical block 40 held by the fixing member 25 is configured to be slidable along the fixing member 25 in the optical axis Ax direction in FIG. 3, that is, in the vertical direction in FIGS. 2 (a) and 2 (b). The optical block 40 is slid in the vertical direction in FIGS. 2A and 2B to adjust the focus of the projected image by the projector module PJ. A fine adjustment mechanism for sliding the optical block 40 little by little is not shown in FIG. As described above, the fixing member 25 and the optical image forming block 30 and the fixing member 25 and the optical block 40 can be integrated without using a screw or an adhesive.

  When the projector module PJ integrally formed as described above is fixed to the casing of the mobile phone 10, the exposed portion of the substrate 21 </ b> B is configured to be located immediately inside the vent hole 14 (FIG. 1) of the mobile phone 10. The

According to the first embodiment described above, the following operational effects can be obtained.
(1) The projector module PJ has a configuration in which the optical image forming block 30 and the optical block 40 are integrated by the fixing member 25. The optical image forming block 30 is configured by disposing an aluminum substrate 21B on which an LED 21A is mounted and a liquid crystal panel 22 in a casing 26 made of a plastic material having low thermal conductivity. The casing 26 holds the liquid crystal panel 22 apart from the fixing member 25 and makes it difficult for the heat generated by the LEDs 21 </ b> A to be transmitted to the liquid crystal panel 22, thereby preventing the liquid crystal panel 22 from reaching a high temperature.

(2) Since the high-intensity white LED 21A is mounted on the metal substrate 21B, the heat conductivity is higher than when a dielectric substrate is used, and the heat generated by the LED 21A can be quickly released to the substrate 21B. it can. Thereby, it can prevent that the temperature of an apparatus rises exceeding an allowable range. In particular, when the LED 21A emits light with high luminance, the amount of heat generated by the LED 21A increases. Therefore, enhancing the heat dissipation effect is important for protecting the LED 21A from temperature rise.

(3) Since the metal thin plate is subjected to sheet metal bending to form the fixing member 25, and the fixing member 25 and the substrate 21B are in surface contact, the heat released to the substrate 21B is efficiently radiated from the fixing member 25. Can be made.

(4) Since the hole 25Z is provided in the surface where the fixing member 25 comes into contact with the substrate 21B so as to expose a part of the substrate 21B, heat can be directly radiated from the substrate 21B.

(5) The optical block 40 is configured by arranging a PBS 23A and a reflecting member 23B in a casing 24 made of a plastic material having low thermal conductivity, and providing a quarter-wave plate 23λ at the boundary between both members. . Since the heat transmitted from the optical image forming block 30 to the fixing member 25 is hardly transmitted to the PBS 23A and the reflecting member 23B in the optical block 40, it is possible to prevent the deterioration of the projection image quality due to the thermal expansion.

(6) The fixing member 25 and the optical image forming block 30 are integrated by sandwiching the fixing member 25 and the optical image forming block 30 so that the fixing member 25 covers the optical image forming block 30 having a substantially rectangular parallelepiped shape. In the state where the hole 25X (FIG. 2 (a)) and the hole 25Y (FIG. 2 (b)) are respectively provided in two surfaces of the joint surface, the optical image forming block 30 is held by the fixing member 25. The projection 26X and the projection 26Y provided on the housing 26 of the optical image forming block 30 are engaged with each other. This eliminates the need for screws or adhesives, improves assembly workability, and facilitates the integration of the fixing member 25 and the optical image forming block 30. In addition, since the fixing member 25 having good thermal conductivity covers the outside of the optical image forming block 30, an effect of enhancing the heat dissipation effect can also be obtained.

(7) The fixing member 25 and the optical block 40 are integrated with each other in such a manner that the fixing member 25 sandwiches the substantially rectangular parallelepiped optical block 40 on two surfaces, and the sandwiched optical block 40 extends along the fixing member 25 in FIG. It was made to slide in the optical axis Ax direction, that is, the vertical direction in FIGS. Thereby, the focus adjustment of the projection image by the projector module PJ can be easily performed.

  When the projector module PJ is fixed to the casing of the electronic device using the mounting portions 25A and 25B, it is desirable to fix the projector module PJ so as to come into contact with the chassis having good thermal conductivity. As a result of the heat conducted from the optical image forming block 30 to the fixing member 25 being further transmitted to the chassis, the heat dissipation effect can be further enhanced.

  When the electronic device on which the projector module PJ is mounted does not include a metal chassis, a backlight heat dissipating member that dissipates heat generated by the backlight (not shown) of the liquid crystal display 12 (FIG. 1); It is preferable that the mounting portions 25A and 25B of the projector module PJ are brought into contact with each other on the surface.

  The mounting portions 25A and 25B may be brought into surface contact with the heat dissipation member for the power transistor in addition to the heat dissipation member for the backlight.

(Second embodiment)
4A and 4B are five views of the projector module PJ according to the second embodiment of the present invention, in which FIG. 4A is a rear view, FIG. 4B is a bottom view, FIG. 4C is a left side view, and FIG. Figure (e) shows the right side view. The second embodiment is different from the first embodiment in that the optical block and the optical image forming block are constituted by one block, and the module constituted by one block is integrated with the fixing member 125. The fixing member 125 is formed by bending a metal thin plate such as an aluminum plate. The fixing member 125 has mounting portions 125A and 125B having holes for screwing, and is fixed to the casing of the electronic device using these mounting portions 125A and 125B.

  FIG. 5 is a cross-sectional view taken along line GG ′ in FIG. In FIG. 5, a substrate 121 </ b> B is disposed on the housing 126. The housing 126 is formed of a material having low thermal conductivity such as plastic. The substrate 121B is an aluminum substrate, and a high-intensity white LED 121A is mounted on a pattern formed on the substrate 121B. The LED 121A illuminates the liquid crystal panel 122 with brightness according to the current supplied via the harness 121C. The liquid crystal panel 122 is configured by sealing liquid crystal between glasses 122A and 122B. The liquid crystal panel 122 may be compatible with color display or monochrome display.

  A condensing member 127 is disposed between the LED substrate 121B (LED 121A) and the liquid crystal panel 122. The condensing member 127 is formed by forming a Fresnel lens using a resin material, and also has a function of separating and blocking the space in the housing 126 on the LED 121A side and the liquid crystal panel 122 side.

  The liquid crystal panel 122 is driven by a drive signal for reproducing an image or text. The liquid crystal panel 122 generates a light image by modulating light from the LED 121A in accordance with the drive signal. The light beam transmitted through the liquid crystal panel 122 travels to the right in FIG. 5 and enters the lens 123.

  The lens 123 collects the incident light beam and emits it from the projector projection port 20. The lens 123 includes a plurality of lens groups, and these lens groups are disposed in the lens barrel 124. A screw thread is formed on the outer periphery of the lens barrel 124 and is screwed with a screw thread formed on the inner periphery of the housing 126. When the lens barrel 124 is rotated around the optical axis Ax in FIG. 5, the lens 123 is driven to move back and forth in the optical axis Ax direction, and the focus adjustment of the projected image is performed by the projector module PJ.

  As shown in FIGS. 4A to 4E, the fixing member 125 sandwiches a substantially rectangular parallelepiped casing 126 with five surfaces. That is, in FIG. 4C, the corresponding surfaces of the housing 126 are joined so as to cover the housing 126 from the left, from the bottom, from the right, from the top, and from the upper side of the sheet. Of the surfaces of the fixing member 125 to be joined to the housing 126, the holes 125Y (FIG. 4 (a)) and the holes 125X (the surfaces facing in FIG. 4 (a) and the surfaces facing in FIG. 4 (d)) is provided. These holes 125Y and 125X are configured to engage with the protrusions 126Y and 126X provided on the housing 126, respectively, in a state where the housing 126 is held between the fixing members 125. As a result, the fixing member 125 and the casing 126 can be integrated without using screws or adhesives.

  Further, among the surfaces of the fixing member 125 to be joined to the casing 126, the surface facing in FIG. 4 (c) is particularly configured to be in surface contact with the substrate 121B, and a filler having a good thermal conductivity (for example, silicon grease). ) Is applied and bonded. Further, a hole 125Z is provided on the surface of the fixing member 125 so as to expose a part of the substrate 121B in a state where the fixing member 125 holds the housing 126.

  When the projector module PJ integrally formed as described above is fixed to the casing of the electronic device, it is desirable that the exposed portion of the substrate 121B is positioned in the vicinity of the vent hole of the electronic device.

According to the second embodiment described above, the following operational effects can be obtained.
(1) Since the optical block (lens 123) and the optical image forming block (housing 126) are configured with one block, the projector module PJ can be configured more compactly than when configured with a plurality of blocks.

(2) Since the light condensing member 127 is provided so as to separate and block the space in the housing 126 on the LED 121A side and the liquid crystal panel 122 side, the heat generated on the LED side due to the diffusion of heat by the internal air is liquid crystal panel It is possible to suppress the transmission to the side.

  The condensing member 127 may have diffusibility. In this case, as a result of uniformly illuminating the effective area of the liquid crystal panel 122, a high-quality projected image with reduced luminance unevenness can be obtained over the entire projection screen.

  The fixing member 125 sandwiches the substantially rectangular parallelepiped casing 126 from five surfaces, but it may be three surfaces or four surfaces instead of the five surfaces. However, it is preferable to sandwich at least three surfaces including two surfaces facing each other and a surface orthogonal to these two surfaces. For example, in FIG. 4C, the corresponding surfaces of the casing 126 are joined so as to cover the casing 126 from the left, from the right, and from three directions above the paper surface.

  Although the example in which the casing 126 has a rectangular parallelepiped shape, that is, a quadrangular prism shape has been described, a pentagonal prism or a hexagonal prism may be used.

  The condensing member 127 may be applied to the projector module PJ according to the first embodiment described above.

  In the above description, an example in which the projector module PJ is mounted on the mobile phone 10 used for hand hold has been described. However, the projector module PJ is mounted on a portable electronic device such as a notebook computer, PDA, electronic camera, or playback device instead of the mobile phone 10. You may let them.

  Moreover, you may comprise as a projector apparatus provided only with the projection function by the projector module PJ, without combining with another electronic device. 6A and 6B are internal layout diagrams for explaining the projector device, in which FIG. 6A is a plan view and FIG. 6B is a side view. A chassis 63 is disposed in the housing 60, and a main substrate 61, a power supply unit 62, and a projector module PJ (the fixing member 25, the optical image forming block 30, and the optical block 40) are disposed on the chassis 63.

  The power supply unit 62 supplies power to the main board 61. When an image signal is input from an external device via the interface connector 64, a liquid crystal driving circuit (not shown) configured on the main board 61 is driven to the liquid crystal panel 22 of the optical image forming block 30 via the harness 21D. A signal is supplied, and an LED drive circuit (not shown) supplies a drive current to the LED 21A via the harness 21C.

  In the above description, the white light source is used as the projector light source. However, the present invention can also be applied to a case where a color (multiple color) light source is used as a light source of a liquid crystal panel compatible with monochrome display. In this case, the LEDs of a plurality of colors are sequentially turned on in a time division manner, and when the respective colors are turned on, the liquid crystal panel is sequentially driven in a time division manner with an image signal (drive signal) corresponding to each color. By sequentially projecting the light images of the respective colors in a time-division manner, it can be observed as a color image by the observer's eyes. The plurality of colors are, for example, three primary colors of R (red), G (green), and B (blue), and Y (yellow) and B (blue).

  Correspondence between each component in the claims and each component in the best mode for carrying out the invention will be described. A light emitting element is comprised by LED21A (121A), for example. The first member is made of, for example, an aluminum substrate 21B (121B). The light valve is constituted by, for example, a liquid crystal panel 22 (122). The projection optical system is configured by, for example, the optical block 40 (lens 123). The second member is constituted by, for example, the casing 26 (126). The third member is constituted by a fixing member 25 (125), for example. The projector device is constituted by, for example, a projector module PJ. The electronic device is configured by, for example, the mobile phone 10. For example, the mounting portions 25A and 25B (125A and 125B) correspond to the mounting allowance. The separating means is constituted by, for example, a light collecting member 127. In addition, as long as the characteristic function of this invention is not impaired, each component is not limited to the said structure.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the mobile phone with a projector by 1st embodiment of this invention, (a) is a side view, (b) is a front view. It is a three-view figure of a projector module, (a) is a front view, (b) is a side view, (c) is a bottom view. It is sectional drawing of a projector module. It is a five-side view of the projector module according to the second embodiment, (a) is a rear view, (b) is a bottom view, (c) is a left side view, (d) is a front view, (e) is a right side view. FIG. It is sectional drawing of a projector module. FIG. 2 is an internal layout diagram illustrating a projector device, where (a) is a plan view and (b) is a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Mobile phone 14 ... Vent 20 ... Projector projection port 21A (121A) ... LED
21B (121B) ... Aluminum substrate 22 (122) ... Liquid crystal panel 22A (122A), 22B (122B) ... Glass 24, 26, 126 ... Case 25, 125 ... Fixing members 25A, 25B ... Mounting portions 25X, 25Y, 25Z 125X, 125Y, 125Z ... holes 26X, 26Y, 126X, 126Y ... projection 30 ... optical image forming block 40 ... optical block 123 ... lens 124 ... lens tube 127 ... condensing member Ax ... optical axis PJ ... projector module

Claims (8)

A first member formed of a material having thermal conductivity and having a light emitting element disposed on a surface thereof;
A light valve that modulates light from the light emitting element;
A projection optical system for projecting an image of light modulated by the light valve;
A second member that is formed of a material having lower thermal conductivity than the first member, and at least the first member and the light valve are disposed;
The first member is formed of the same material as the first member or a material having higher thermal conductivity than the second member, and integrally supports the second member and the projection optical system, and at least one surface of the first member. A projector device for mounting on an electronic device, comprising: a third member in surface contact with the upper surface. In the projector apparatus for electronic equipment according to claim 1,
The second member has a prismatic shape surrounding the passing light beam,
The projector device for mounting on an electronic device, wherein the third member is bent along the outer surface of the prism. In the projector apparatus for electronic equipment according to claim 2,
The first member is disposed at the bottom position of the prismatic shape in the second member,
The projector device for mounting on electronic equipment, wherein the third member is in surface contact with the first member at the bottom surface position. In the projector apparatus for electronic equipment according to claim 1,
The projector device for mounting on electronic equipment, wherein the second member is spaced apart from the third member to hold the light valve. In the projector device for an electronic device according to any one of claims 1 to 4,
The third device has a mounting allowance for integrating with an electronic device, and is mounted on an electronic device. In the projector device for an electronic device according to any one of claims 1 to 5,
The second member is further provided with separation means for separating the space on the first member side and the light valve side ,
The projector for mounting an electronic device , wherein the separating means is a plate-like transparent member that transmits light from the light emitting element and suppresses transmission of heat from the light emitting element to the light valve side. apparatus. In the projector device for electronic equipment according to claim 6,
  The projector device for mounting on electronic equipment, wherein the separating means is a member having a light collecting action. In the projector device for electronic equipment according to claim 7,
  The projector device for mounting on electronic equipment, wherein the member having a light condensing function is a Fresnel lens.

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