JP3705287B2 - Optical unit and projection display device - Google Patents

Description

  The present invention relates to an optical unit and a projection display device.

  The projection display device basically includes the following parts. That is, a light source lamp unit (light source unit), an optical system that optically processes a white light beam emitted from the light source lamp unit so as to synthesize a color image corresponding to image information from a TV, a personal computer, etc. This is a circuit board group on which a projection lens unit that projects the emitted light beam onto a screen, a power supply unit, a control circuit, and the like are mounted. Except for the projection lens unit, each of these parts is disposed in an apparatus exterior case, and the projection lens unit is generally mounted in a state of protruding from the front surface of the apparatus.

  Here, the optical system includes a color separation optical system that separates the white light beam emitted from the light source lamp unit into three primary color light beams, and three liquid crystal light valves that modulate the separated light beams based on image information. A color combining optical system that combines the modulated light beams of the respective colors modulated through the liquid crystal light valve. These light source lamp unit, color separation optical system, liquid crystal light bulb, and the like are conventionally arranged in a predetermined layout in a resin light guide. On the other hand, the color synthesis optical system and the projection lens unit are mounted on a metal head body separate from the light guide, and this head body is mounted on the light guide. In this way, various optical components are supported by the light guide, and are arranged in the apparatus exterior case together with the power supply unit and the circuit board group as an optical unit.

  Further, as described above, various optical components are mounted on the optical unit, and it is necessary to adjust the optical axes thereof, so various optical axis adjustment mechanisms are configured. In addition, since the projection display apparatus generates a considerable amount of heat from the light source lamp unit, the color synthesis optical system, and the power supply unit, various cooling mechanisms are also incorporated. In general, outside air is introduced by an intake fan from the ventilation hole of the outer case, and the outside air is exhausted after flowing through the internal heat source.

  Many of these types of projection display devices are brought into a conference room as needed rather than being completely stationary, and are used for the purpose of projecting conference materials and the like on a screen. For this reason, the projection display device is desired to be light enough to be portable.

  However, in conventional projection display devices, the light guide made of resin is made thick so that the optical axes of various optical components do not shift even if there is considerable heat generation from the light source unit, color synthesis optical system, and power supply unit. Therefore, the projection display device cannot be reduced in size and weight. Also, if the heat guide of the resin itself is low and the light guide is made thicker, the heat dissipation from the optical unit will be reduced accordingly, so the optical components will be hot and the optical components must be used with a large safety factor. There is also a problem that the reliability is lowered.

  Another problem is that it is difficult to take measures against EMI because a circuit for processing a weak video signal at high speed and a light source lamp that generates strong noise coexist.

  Accordingly, an object of the present invention is to provide an optical unit and a projection display capable of reducing the weight and improving the heat dissipation performance and improving the reliability by improving the material of the member used by paying attention to such points. To provide an apparatus.

  Furthermore, another object of the present invention is to provide an optical unit and a projection display device that can easily take measures against EMI.

In order to solve the above problems, the optical unit of the present invention optically processes the light beam emitted from the light source unit to form an optical image corresponding to the image information, and this optical image is passed through the projection optical system. An optical unit used in a projection display device that projects an enlarged image on a projection surface, the optical unit separating a light beam emitted from the light source unit into a plurality of color light beams, and an image of the separated light beams of each color A plurality of light valves that are modulated based on information, a color combining optical system that combines the modulated light beams of the respective colors modulated through the light valve, and a modulated light beam that is combined by the color combining optical system is directed to the projection surface A light guide using a molded product made of a magnesium alloy, the light source unit, the color separation optical system, the light valve, the color synthesis optical system, and the projection optical system. In The light guide includes an optical component positioning unit for positioning and fixing the optical component constituting the color separation optical system or the light valve, and a plate-like optical component of the optical component positioning unit. positioning portion for positioning the parts plate-shaped and receiving portion for supporting across the both planes of the optical component, before Symbol supporting two support across the opposing faces of the tabular optical components to be positioned to be positioned A positioning portion for positioning the flat optical component has a structure for supporting the flat optical components positioned at three points by the receiving portion and the two support portions , The support portions are respectively disposed at positions shifted in the planar direction of the flat plate-shaped optical component to be positioned, and are supported by sandwiching the flat surfaces facing the flat plate-shaped optical component. Characterized in that it is composed of a-decided Me member.

  The molded product made of a magnesium alloy in the present invention is not limited to a product made of a single magnesium material, but also includes a molded product made of a magnesium alloy.

  According to the present invention, a molded product made of a magnesium alloy used for a light guide of an optical unit has a lower specific gravity and higher heat dissipation and thermal conductivity than a molded product made of a resin. Moreover, it has high strength even when it is thin compared to a molded product made of resin. Moreover, as shown in comparison with Table 1, even when compared with a molded product made of an aluminum alloy or a molded product made of a zinc alloy, the specific gravity is small and the heat dissipation and the thermal conductivity are high although the specific heat is large. . For example, the specific gravity of a molded product made of resin is about 2.7, which is equivalent to that of a molded product made of an aluminum alloy, whereas the specific gravity of a molded product made of a magnesium alloy is about 1.8. For this reason, an optical unit can be reduced in weight.

  In addition, even if the light guide is thin, the light guide has sufficient strength, so that the optical unit can be further reduced in weight by being thinned. Furthermore, if the light guide is made thin, in addition to the increase in heat dissipation, there is also room for space in the projection display device, which is sufficient before and after the intake fan placed in the vent of the exterior case. Cooling efficiency can also be improved from the structural aspect, such as ensuring space and smooth intake of cooling air. Therefore, the internal temperature rise can be suppressed, and the margin on the heat resistance surface of the optical element such as the polarization conversion element can be substantially ensured, so that the reliability is improved. In addition, since the magnesium molded product has higher impact resistance and vibration resistance than the resin molded product, stable accuracy can be maintained and failure is unlikely to occur. In addition, unlike a resin molded product, the magnesium molded product has almost no deterioration of the material, and therefore has high reliability. For example, when a resin molded product receives ultraviolet rays from the light source part, a part of the resin is decomposed, and this decomposed product may adhere to the light source part or the optical component and deteriorate the performance. In such cases, there is no such performance degradation. Furthermore, the magnesium molded product has the advantage that it can be recycled.

  Table 2 shows some examples of magnesium alloys.

  Furthermore, the positioning part for positioning the flat optical component in the optical component positioning part includes a receiving part and two support parts, and has a structure for supporting the flat optical part at three points. By forming the two support portions, the positioning portion can be made not to be a continuous groove, the weight is reduced, and a space can be secured as much as there is no groove in the middle.

In the optical unit according to the aspect of the invention, it is preferable that a head portion for mounting the color synthesis optical system and the projection optical system is integrally formed on the light guide.
According to the present invention, when the color synthesis optical system and the projection optical system are mounted on the light guide using a separate head body, a combination play between the light guide and the head body Where variations in tolerances are unavoidable, if the head part is configured integrally with the light guide, there is no variation in the above-mentioned combination play and tolerances, so the color guide optical system and projection optical system are screwed to the light guide, etc. It can be mounted accurately with the simple method. Therefore, since the optical axis adjustment is not necessary, the production cost can be reduced. Further, it is not necessary to provide a complicated positioning mechanism or adjustment mechanism in the light guide.

In the optical unit according to the aspect of the invention, it is preferable that the head unit includes an optical component mounting unit that includes a step for positioning and fixing the prism configuring the color synthesis optical system.
According to the present invention, it is not necessary to use a prism fixing plate separate from the head portion.

In the optical unit of the present invention, it is preferable that the head portion and the optical component positioning portion are formed of a molded product made of the magnesium alloy and integrated with the light guide.
According to the present invention, since there is no resin portion, a molded product made of a magnesium alloy has a smaller specific gravity than a molded product made of a resin, and is excellent in terms of heat dissipation and strength. It can be used for a limited time. Further, since there is no resin portion, the exposed area of the molded product made of a magnesium alloy having high heat dissipation is wide, which is advantageous in terms of heat dissipation. Further, since there is no resin molding portion, secondary processing such as cutting of a dimension after resin molding can be omitted completely, which is advantageous for cost reduction.

In the optical unit according to the aspect of the invention, the positioning unit that positions the non-flat optical component among the optical component positioning portions includes a guide portion that guides a side end surface of the non-flat optical component to be positioned. It is preferable that the height dimension of the part is lower than the outer dimension of the non-flat optical component to be positioned.
Here, the height dimension of the guide portion only needs to be able to guide and support half or more of the outer dimension of the non-flat optical component.
According to the present invention, since the height of the guide portion is low, magnesium molding becomes easy and the weight is reduced.

In the optical unit of the present invention, the optical component positioning portion includes the guide portion and the main body portion, and the height dimension of the guide portion is in a range of ½ to 3/4 of the height dimension of the main body portion. It is preferable that
According to the present invention, the height of the optical component can be guided, magnesium molding is facilitated, and the weight is reduced.

In the optical unit of the present invention, the draft angle of the mounting reference surface of the three-point support structure for positioning the flat optical component is set to 0 ° to 0.008 °, and two other side surfaces other than the mounting reference surface The draft angle is preferably 1 ° to 2 °.
According to the present invention, the optical component may be attached by being pressed against the reference surface, so that it can be easily attached at an accurate position and a normal image can be obtained.

In the optical unit according to the aspect of the invention, in the gap between the other two surfaces and the end portion of the flat plate-shaped optical component to be positioned, the flat plate-shaped optical component to be positioned is pressed against the mounting reference surface and the positioning is performed. It is preferable that a buffer member for preventing rattling of the flat optical component is disposed.
Here, examples of the buffer member include elastic members such as sponge, tape, and resin.
According to the present invention, after the optical component is pressed against the reference surface, the buffer member is packed on the side opposite to the reference surface, so that the optical component or the like is not rattled and the optical component can be securely held.

A projection display device according to the present invention includes the above-described optical unit, a power supply unit for driving the light source unit, and the like, and an exterior case that houses the power supply unit and the optical unit.
According to the present invention, since the light guide is formed of a molded product made of a magnesium alloy, the light guide has sufficient strength even if it is configured to be thin. Can be planned. Furthermore, if the light guide is made thin, in addition to the increase in heat dissipation, there is also room for space in the projection display device, which is sufficient before and after the intake fan placed in the vent of the exterior case. Cooling efficiency can also be improved from the structural aspect, such as ensuring space and smooth intake of cooling air. Therefore, the internal temperature rise can be suppressed, and the margin on the heat resistance surface of the optical element such as the polarization conversion element can be substantially ensured, so that the reliability is improved. In addition, a molded article made of a magnesium alloy has higher impact resistance and vibration resistance than a molded article made of a resin, so that stable accuracy can be maintained and failure is unlikely to occur. In addition, a molded article made of a magnesium alloy is highly reliable because there is almost no material deterioration unlike a molded article made of a resin. For example, when a molded product made of resin is exposed to ultraviolet rays from the light source part, a part of the resin is decomposed, and this decomposed product may adhere to the light source part or the optical component and deteriorate the performance. In the case of a molded article made of, there is no such performance degradation. Furthermore, there is an advantage that a molded product made of a magnesium alloy can be recycled.

In the projection display device according to the aspect of the invention, the exterior case and the head portion are formed using a molded product made of a magnesium alloy similar to the light guide, and the exterior case, the head portion, and the light guide are integrated. Preferably, it is formed.
According to the present invention, even the outer case is formed of a molded product made of a magnesium alloy, so that the projection display device can be further reduced in weight and size, and can be easily hung on the ceiling. Become.

In the projection display device according to the aspect of the invention, the outer case and the head portion are formed using a molded product made of a magnesium alloy similar to the light guide, and the outer case and the light guide are formed separately. Preferably it is.
According to the present invention, it is possible to avoid the risk of cost increase of the outer case (modification for molding quality and appearance quality) and to improve the heat dissipation performance of the outer case. Furthermore, since the exterior case and the optical unit can be sold separately, the sales are facilitated.

In the projection display device according to the aspect of the invention, it is preferable that the light guide and the outer case are set to a ground potential and used as a shielding material.
According to the present invention, a strong noise is emitted to the outside in order to cause an arc discharge between the lamp electrodes in the lamp emission state. This noise is further concentrated and radiated by the reflector. Since this can be completely shielded by the upper and lower light guides set to the ground potential and the outer case, it is possible to prevent an adverse effect on a circuit that processes a weak and high-speed signal. As a result, the margin of EMI can be increased, and it is possible to cope with high-speed signal generation with higher definition. In addition, the light guide and the outer case can also serve as a reliable earth bus line of the circuit board adjacent to the light guide and the outer case. Furthermore, it can also serve as a shield for the primary power supply line and the lamp drive line.

In the projection display device of the present invention, the height dimension of the lower light guide among the upper and lower light guides constituting the optical unit is 1/2 to 2/3 of the total height dimension of both light guides. It is preferable.
According to the present invention, various components can be stably attached to the lower light guide.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
〔overall structure〕
A projection display apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
1. First embodiment (overall configuration)
1A and 1B are a front view and a rear view, respectively, of the projection display device of the present embodiment. 2A and 2B are a plan view and a bottom view, respectively, of the projection display device of this embodiment. 3A and 3B are a right side view and a left side view, respectively, of the projection display apparatus of the present embodiment.

  In these drawings, the projection display device 1 according to the present embodiment has a resin exterior case 2 having a rectangular parallelepiped shape. The outer case 2 basically includes an upper case 3, a lower case 4, and a rear case 5 that defines the rear surface of the apparatus. From the center of the front surface of the apparatus, the front end portion of the projection lens unit 6 (projection optical system) protrudes.

  As can be seen from FIG. 1B, an AC inlet 36 for supplying external power and various input / output terminal groups 50 are arranged on the rear wall 5 d of the rear case 5. Therefore, since the signal cable or the like is not placed on the side surface of the apparatus where the user is usually located, the usability is good.

(Structure of exterior case)
The upper case 3 is formed of a rectangular upper wall 3a, and left and right side walls 3b, 3c and a front wall 3d extending downward substantially vertically from three sides except the rear side. Similarly, the lower case 4 is formed of a rectangular bottom wall 4a, and left and right side walls 4b and 4c and a front wall 4d that are erected almost vertically from three sides except the rear side. The rear case 5 basically has a structure that guides and holds the inlay portions of the upper case 3 and the lower case 4 from the outside. The rear case 5 is fixed to the lower case 4 by screws (not shown). It is held in a state of being engaged with a hook portion (not shown).

  The upper case 3 and the lower case 4 have a central portion that is slightly convex forward, and a circular opening 52 around which an annular rim 51 is formed is provided in this portion. Thus, the front end portion of the projection lens unit 6 extends to the front side of the apparatus. On the lower surface side of the front end portion of the projection lens unit 6 projecting from the exterior case 2, a guard portion 53 is formed for attaching a hand when lifting the front end side of the apparatus. This guard portion 53 is the front end of the projection lens unit 6. It is a thick rim that covers the part like a hood.

  A large number of communication holes 25R, 25L are formed at positions corresponding to built-in speakers (not shown) at the left and right ends of the upper side of the upper wall 3a of the upper case 3. In addition, an operation switch 26 is attached to a central portion on the front side of the upper wall 3a.

  A remote control light-receiving filter 351a that covers the light-receiving window is disposed at the left side position of the front wall 3d that defines the front of the apparatus in the upper case 3. A remote control light receiving filter 351b is also disposed on the rear wall 5d of the rear case 5.

  Foot 31R and 31L are arranged at the left and right corners of the rear end of the bottom wall 4a of the lower case 4, and the foot 31R can be adjusted mainly in the horizontal direction of the projection screen by turning it. A foot 31C for height adjustment is also formed at a position closer to the front of the lower case 4, and the foot button 310 disposed on the upper end portion of the front wall 3d of the upper case 3 is pressed, so that the body of the apparatus can be operated with one hand. The posture in the vertical direction (projection direction from the projection lens unit 6) can be adjusted.

  An air filter cover 23 is attached to the bottom wall 4a of the lower case 4 at a position on the front side in the center. A large number of air holes 28 are formed in the air filter cover 23, and air is sucked into the exterior case 2 from these air holes 28.

  A lamp replacement lid 27 is attached to the bottom wall 4 a of the lower case 4 at a position corresponding to a light source lamp unit 8 (described later) built in the exterior case 2. The replacement lid 27 is screwed to the bottom wall 4a. The light source lamp unit 8 can be replaced by loosening the screw and removing the lamp replacement lid 27. Here, a large number of small intake holes 271 are formed in the lamp replacement lid 27, and air is also sucked from these intake holes 271.

(Handle mounting structure)
As can be seen from FIG. 3A, a portable handle 38 is attached to the right side surface of the apparatus. The two base end portions 38 a and 38 b of the handle 38 are rotatably attached to the mating surface portions of the side walls 3 b and 4 b of the upper case 3 and the lower case 4. The side wall 4b of the lower case 4 is formed with a recess 3e for storing the handle, and the handle 38 can be stored therein.

  As shown in FIG. 4, the light guide 100 housed in the exterior case 2 has both the connecting portion between the right side surface and the front end surface and the connecting portion between the right side surface and the rear end surface as a whole. The units 101 and 102 are configured. Therefore, the gap between the oblique sides 101 and 102 and the outer case 2 is wide. Therefore, in this example, when the handle 38 is attached to the side surface portion of the exterior case 2 as shown in FIG. 3A, the attachment portions of the base end portions 38a and 38b are formed by the oblique sides 101 and 102. It is set to a part corresponding to a wide gap.

  With this configuration, it is not necessary to increase the width of the apparatus when configuring the attachment portions of the base end portions 38a and 38b, and the projection display device 1 can be downsized.

  As can be seen from FIG. 3 (B), the side walls 3c and 4c of the upper case 3 and the lower case 4 defining the opposite side surface of the apparatus are placed in a state where both of them are placed downward. A pad lower 381 and a pad upper 382 are disposed for placing on the desk.

(Structure inside exterior case)
FIG. 4 shows the arrangement of the components in the exterior case 2 of the projection display device 1. As shown in this figure, a power supply unit 7 is disposed inside the outer case 2 on the right end side toward the front of the apparatus. An optical unit 10 on which the light source lamp unit 8 and the projection lens unit 6 are mounted is disposed at a position adjacent to the right side of the apparatus.

  FIG. 5 is a perspective view showing an appearance of the optical unit 10 of the present embodiment.

  As shown in FIG. 5, the optical unit 10 of the present embodiment accommodates optical elements other than the projection lens unit 6, and is generally configured by a light guide 100 including upper and lower light guides 901 and 902 and a projection lens unit 6. ing. The light guide 100 is integrated with the projection lens unit 6 and is fixed to the lower case 4 by a fixing screw.

  In the optical unit 10, the optical path from the light source lamp unit 8 to the projection lens unit 6 is generally L-shaped as a whole, and the planar shape of the optical unit 10 also has an approximately L-shape corresponding to this optical path. are doing.

  On the other hand, the power supply unit 7 is an extension that is bent at the front end portion of the main body portion 71 so as to form a main body portion 71 arranged from the rear of the device toward the front of the device and a flat L-shape opposite to the optical unit 10. The extended portion 72 is located on the side of the projection lens unit 6. An auxiliary cooling fan 17 is built in the end of the extended portion 72 of the power supply unit 7.

  Although not shown in the figure, the power supply unit 7 has each component built in a metal shield case, and prevents electrical and magnetic noise generated in this portion from leaking to the outside. The shield case used for this constitutes a passage when cooling air flows inside the power supply unit 7 and also constitutes a passage of cooling air flowing from the power supply unit 7 to the light source lamp unit 8. Further, the shield case interlocks the power supply to the light source lamp unit 8 in conjunction with the opening / closing of the lamp replacement lid 27 in conjunction with the operation of opening the AC input line routed to the power supply unit 7 and the lamp replacement lid 27. A safety switch such as an interlock switch that automatically shuts off is mounted, and an output line to the light source lamp unit 8 is also covered, and noise generated therefrom is shut off.

  In this way, by taking advantage of the fact that the optical unit 10 has a planar L shape, the power supply unit 7 also has a planar L shape, and when these are combined, a region partitioned by the optical unit 10 and the outer case 2 The inside is not wasted. Therefore, since the optical unit 10 and the power supply unit 7 can be arranged in a narrow area, the projection display device 1 can be reduced in size.

  As shown in FIG. 6A, a cooling air intake fan 15 is provided in a portion of the bottom surface of the exterior case 2 that is positioned below a prism unit 910 that constitutes a color combining optical system described later. A vent 150 is disposed.

  On the other hand, on the rear end side of the apparatus, an exhaust port 160 including the exhaust fan 16 is configured with respect to the rear case 5, and the exhaust port 160 is configured as a projecting portion 501 that partially projects from the rear case 5. In this way, the exhaust sound can be prevented by moving the exhaust port 160 away from the exhaust fan 16.

(Substrate layout)
As shown in FIG. 5 and FIGS. 6A and 6B, a driver substrate 13 (drive) for liquid crystal drive control is provided on the upper surface side of the light guide 100 in which a part of the optical components constituting the optical unit 10 is accommodated. A circuit board) is fixed by screws, and a video board 11 on which a video signal processing circuit is mounted is arranged on the upper surface side in parallel. Both the driver board 13 and the video board 11 are arranged so that the rear end of the board reaches near the rear end surface of the apparatus, and the input / output terminals of the D-sub connector are directly attached to the rear end of the video board 11, They constitute a part of the input / output terminal group 50 of the rear case 5. Accordingly, since the wiring distance between the input / output terminal 50 formed on the rear end face of the apparatus and the driver board 13 and the video board 11 can be shortened, the circuit system for processing a high-speed and weak signal is affected by noise and the like. It is hard to receive.

  Between the rear end surface of the light guide 100 and the rear case 5, an audio board 180 for interfacing television images and audio signals is disposed vertically, and the audio board 180 is connected to the rear end portion of the video board 11 by wiring. Has been. A metal chassis 181 is disposed between the audio board 180 and the rear case 5. The chassis 181 is conductively connected to the light guide 100 which is a metal casing. In this way, by arranging the substrates close to each other, the mutual wiring distance is shortened so that it is not easily affected by noise. The audio board 180 is fixed to the rear case 5 via the chassis 181 so that it can withstand the insertion / extraction force applied to the interface terminal mounted on the audio board 180.

  The electrical connection between the substrates 11 and 13 is as follows. First, a connector 114 is disposed on the lower surface of the video board 11, and a connector 116 that can be plugged into the connector 114 is disposed on the upper surface of the driver board 13. Therefore, in a state where the substrates 11 and 13 are arranged, the connectors are connected. Thus, in this example, since the connection between each board | substrate is formed without drawing a lead wire etc., there are few noise generation sources and generation | occurrence | production of noise can be suppressed. Further, since the driver board 13 is screwed and fixed to the upper surface of the light guide 100, OEM or the like can be performed with the driver board 13 fixed to the optical unit 10, which is convenient.

  That is, since light valves (described later) housed in the light guide 100 have slightly different characteristics, it is necessary to make electrical adjustments to obtain a desired image quality after the optical unit 10 is assembled.

  Here, if the configuration in which the driver substrate 13 is screwed and fixed to the upper surface of the light guide 100 as in this example is adopted, the driver substrate 13 and the optical unit 10 are electrically adjusted after the driver substrate 13 is electrically adjusted. Can be delivered to the customer as a set, and the customer does not need to make any electrical adjustments.

  On the lower surface side of the light guide 100, a remote substrate 140 on which a remote signal processing circuit for performing signal processing input from a mouse or the like is mounted is disposed. Here, the remote board | substrate 140 is arrange | positioned so that insertion / extraction is possible from the apparatus rear end side. For this reason, even if it is necessary to use a circuit board having a different circuit configuration depending on the model for a remote circuit for a mouse or the like, it can be easily handled by replacing the remote board 140 from the rear end side of the apparatus.

(Optical unit)
The optical system incorporated in the optical unit 10 will be described with reference to FIGS. 8 to 11 are cross-sectional views taken along lines AA, BB, CC, and DD in FIG. 7, respectively. The optical system of this example includes an illumination optical system 923, a color separation optical system 924 that separates light beams emitted from the illumination optical system 923 into red, green, and blue color light beams R, G, and B, and each color light beam. Liquid crystal light valves 925R, 925G, and 925B as light valves for modulating the light, a prism unit 910 as a color combining optical system for recombining the modulated color light beams, and the combined light beams are enlarged and projected on the screen. The projection lens unit 6 is configured.

  The illumination optical system 923 includes a light source lamp unit 8 (light source unit), integrator lenses 921 and 922, a polarization conversion element 920, a condenser lens 930, and a reflection mirror 931.

  As shown in FIG. 12, the light source lamp unit 8 includes a light source lamp 801 and a lamp housing 802 in which the light source lamp 801 is built. The light source lamp 801 includes a lamp main body 805 such as a metal halide lamp and a reflector 806, and emits light from the lamp main body 805 toward the integrator lens 921 along the optical axis. As the lamp body 805, a halogen lamp, a metal halide lamp, a xenon lamp, or the like can be used.

  The lamp housing 802 has an opening on the front surface in the optical axis direction. The side surfaces of the lamp housing 802 are formed with passage holes 808 and 809 for cooling air and passage holes (not shown) formed on the back side of the reflector 806. In this example, the lamp housing 802 and the light source lamp 801 are integrally formed, and when replacing the lamp, they are attached and detached while remaining integral.

  Integrator lenses 921 and 922 are made up of an assembly of a plurality of rectangular lenses arranged in a matrix, and divide a light beam emitted from light source lamp 801 into a plurality of partial light beams. The polarization conversion element 920 is an optical element that converts each of the partial light beams divided by the integrator lenses 921 and 922 into light of one kind of polarization component. The partial light beams divided by the integrator lenses 921 and 922 and converted into light of one kind of polarization component by the polarization conversion element 920 are superimposed on the surfaces of the light valves 925R, 925G, and 925B by the condenser lens 930. . The reflection mirror 931 is for bending the central optical axis of the emitted light from the illumination optical system at a right angle toward the front of the apparatus.

  The color separation optical system 924 includes a red / green reflecting dichroic mirror 941, a green reflecting dichroic mirror 942, and a reflecting mirror 943. First, in the red / green reflecting dichroic mirror 941, the red light beam R and the green light beam G included in the light beam emitted from the illumination optical system 923 are reflected at right angles and travel toward the green reflecting dichroic mirror 942. The blue light beam B passes through the mirror 941, is reflected at a right angle by the rear reflecting mirror 943, and is emitted from the blue light beam emitting portion to the prism unit 910 side. Of the red and green luminous fluxes R and G reflected by the mirror 941, only the green luminous flux G is reflected at a right angle by the green reflecting dichroic mirror 942 and emitted from the emitting portion of the green luminous flux to the color synthesis optical system side. The The red light beam R that has passed through the mirror 942 is emitted from the emission portion of the red light beam to the light guide system 927 side. The light guide system 927 includes an incident side lens 974, an incident side reflection mirror 971, an output side reflection mirror 972, an intermediate lens 973 disposed therebetween, and a condensing lens disposed on the front side of the liquid crystal light valve 925B. 953.

  Condensing lenses 951 and 952 are arranged on the emission side of the emission part of the blue light beam B and the green light beam G of the color separation optical system 924, respectively. Each color light beam emitted from each emission part is incident on these condenser lenses 951 and 952 to be collimated.

  The collimated blue and green luminous fluxes B and G are incident on the liquid crystal light valves 925B and 925G and modulated, and image information (video information) corresponding to each color light is added. That is, these light valves are switching-controlled in accordance with image information by a driving means (not shown), thereby modulating each color light passing therethrough. As such driving means, known means can be used as they are. On the other hand, the red light beam R is guided to the corresponding liquid crystal light valve 925R through the light guide system 927, and is similarly modulated according to the image information. As the liquid crystal light valve of this example, for example, one using a polysilicon TFT as a switching element can be used. In FIG. 8 and FIG. 10, 9251 is a flexible printed board for supplying signals to the liquid crystal light valves 925R, 925G, and 925B.

  Further, the liquid crystal light valves 925R, 925G, and 925B are arranged so as to face each end face of the prism unit 910, and before and after that, a synthetic resin polarizing plate (not shown) attached to a glass plate. Is placed.

  Next, the color light beams modulated through the liquid crystal light valves 925R, G, and B are incident on the color synthesis optical system and synthesized there. In this example, the color synthesizing optical system is configured using the prism unit 910 formed of a dichroic prism as described above. The combined luminous flux is enlarged and projected on a screen at a predetermined position via the projection lens unit 6.

  As described above, in this embodiment, the light beam emitted from the lamp main body 805 is reflected by the reflection mirror 931 in the light guide 100, and travels along a large L-shaped optical path along the L-shaped planar shape of the light guide 100. The color separation optical system 924 and the prism unit 910 are reached. Therefore, the optical path is set as long as possible while each optical component is arranged in a narrow area. Therefore, while using a lens having a small F value and sufficiently securing the arrangement positions of the integrator lenses 921 and 922 and the polarization conversion element 920, the liquid crystal light valve uses the light beam emitted from the light source lamp unit 8 as a parallel light beam. 925R, 925G, and 925B can be reached.

  FIG. 13A is a perspective view of the lower light guide 901 constituting the optical unit of this embodiment. FIG. 14 is a perspective view of only a portion of a molded product made of a magnesium alloy used in the lower light guide 901. FIG. 15 shows a resin integrally molded with the molded product made of a magnesium alloy in the lower light guide 901. It is the perspective view which extracted only the part.

  As shown in FIGS. 13A, 14, and 15, the main body portion of the lower light guide 901 is composed of a molded product 900 made of a magnesium alloy. In the lower light guide 901, spaces 800 and 9240 for arranging the light source lamp unit 8, the illumination optical system 923, the color separation optical system 924, the light guide system 927, the liquid crystal light valves 925R, 925G and 925B, and the prism unit 910 are arranged. 9250, and in each space, an optical component positioning unit 190 for positioning various optical elements for configuring the above optical system (in FIG. 13A, a part for positioning and fixing the polarization conversion element 920) Only the code | symbol is attached | subjected). In addition, the space 800 in which the light source lamp unit 8 is arranged is configured such that a molded product 900 made of a magnesium alloy covers the upper surface of the light source lamp unit 8.

  On the other hand, the optical component positioning portion 190 is formed of resin because a structure that cannot be formed by die casting of magnesium or high accuracy is required. In the optical component positioning unit 190, a fixing groove 198 extending in the vertical direction is formed between opposing surfaces of the resin portion 199, and an illumination optical system, a color separation optical system, a light guide system, a liquid crystal light valve, and a color synthesis optical system are provided. Among the optical components to be configured, all of the optical components having a flat plate-shaped optical component or a flat surface portion (flange portion) are fixed using the fixing groove 198 of the optical component positioning portion 190. That is, these flat optical components are inserted into the fixing groove 198 and then fixed with an adhesive or the like. In addition, it is preferable that the resin used for the resin part 199 has a linear expansion coefficient close to that of the magnesium alloy, and for example, glass-filled PC or PPS is used.

  As shown in FIG. 13B, a resin through hole 909 is formed in a portion of the molded product 900 made of a magnesium alloy where the optical component positioning portion 190 that is the resin portion 199 is formed (FIG. 14). (Only part of it is labeled). When the molded article 900 made of a magnesium alloy is integrally formed with the resin portion 199 by outsert molding, as shown by an arrow Re in FIG. 13B, the resin 900 is made of a magnesium alloy through the resin through hole 909. Solidify after flowing into the back of As a result, the resin portion 199 constituting the optical component positioning unit 190 is fixed to the molded product 900 made of magnesium alloy so as to sandwich the molded product 900 made of magnesium alloy. Therefore, even when the resin portion 199 is attached to a part of the molded product 900 made of the magnesium alloy, the resin portion 199 does not fall off from the molded product 900 made of the magnesium alloy. Of course, the resin part 199 made of another part may be fixed to the molded product 900 made of the magnesium alloy by bonding or the like without using the outsert molding of the molded product 900 made of the magnesium alloy. As in the embodiment, when a molded product 900 made of a magnesium alloy is manufactured by outsert molding, there is an advantage that production efficiency is high and dimensional accuracy is high.

  Since the lower light guide 901 configured in this way has the resin portion 199 only partially used, steps such as deburring after molding (cutting for dimensioning) are almost unnecessary and may be necessary. Only a few man-hours are enough. Therefore, the processing cost required for the secondary processing after molding can be greatly reduced as compared with the case where the whole is formed of a molded product made of resin.

  Further, as shown in FIGS. 13A and 14, the lower light guide 901 is integrally configured with a head portion 903 for fixing the color synthesis optical system and the projection optical system. The head portion 903 basically includes a vertical wall 91 extending in a vertical posture in the width direction of the apparatus and a bottom wall 92 extending horizontally from the lower end of the vertical wall 91. On the surface of the bottom wall 92, a thin resin portion 199 (see FIG. 15) provided with a step 198A is integrally formed with the bottom wall 92 as an optical component placement portion of the color synthesis optical system. Each prism piece constituting the prism unit 910 is fixed in a state where it is positioned by the step 198A. The resin portion 199 is also formed in an outsert manner, similar to the resin portion 199 (see FIG. 9) constituting the optical component positioning portion 190 described above. Therefore, the resin portion 199 constituting the optical component placement portion 190A is fixed to the molded product 900 made of magnesium alloy so as to sandwich the molded product 900 made of magnesium alloy through the resin through hole 909.

  A rectangular opening 91b through which light emitted from the prism unit 910 passes is formed in the central portion of the vertical wall 91. The vertical wall 91 is formed with four screw holes 91 d for fixing the base end side (flange portion) of the projection lens unit 6. Therefore, the base end side of the projection lens unit 6 can be fixed to the front surface of the vertical wall 91 only by screwing, and the prism unit 910 can be directly fixed to the upper surface of the bottom wall 92 on the rear surface side.

  As described above, the head portion 903 is integrally formed with the lower light guide 901 in advance, and there is no variation in the combination play and tolerance between the lower light guide 901 and the head portion 903. By simply fixing the projection lens unit 6 and the prism unit 910 so as to be sandwiched, the mutual alignment can be easily performed. Therefore, the assembling work is easy, and it is not necessary to provide an optical axis adjustment or a complicated positioning mechanism or adjustment mechanism, so that the cost can be reduced. In addition, since they are excellent in integration, there is an advantage that even if an impact force or the like is applied after the assembly, there is very little possibility of mutual displacement.

  The bottom wall 92 of the head portion 903 is formed with three communication holes 91g for circulating cooling air. As can be seen from FIG. 6A, the intake fan 15 is attached to the back surface of the bottom wall 92, and the cooling air sucked in by the intake fan 15 passes through the communication holes 91g and flows into the bottom wall 92. It also comes to flow into the upper side.

  As described above, in the present embodiment, when forming the lower light guide 901, a molded product made of a magnesium alloy is used instead of a molded product made of resin or a molded product made of aluminum. This magnesium molded product has a lower specific gravity than a resin molded product. For example, the specific gravity of the resin molded product is approximately 2.7, which is equivalent to that of the aluminum molded product, whereas the specific gravity of the magnesium molded product is approximately 1.8, so that the optical unit can be reduced in weight.

  Further, even if the lower light guide 901 is thinned to about 1.5 mm, the molded product 900 made of magnesium alloy generates heat from the lamp body 805, the prism unit 910 constituting the color synthesis optical system, or the power supply unit 7. And withstands the weight of the optical component, the optical axis can be maintained with high accuracy. Therefore, since the lower light guide 901 can be thinned, the optical unit 10 can be further reduced in weight, and can be easily carried and handled.

  Further, the molded product 900 made of a magnesium alloy has high heat dissipation from the viewpoint of the material and can also increase heat dissipation from the inside because it can be made thin. Therefore, an internal temperature rise can be suppressed. For example, a polarization conversion element that is made of resin and weak against heat is taken as an example. Compared to a conventional structure using a resin light guide, the structure of this embodiment using a molded article 900 made of a magnesium alloy is used. For example, the temperature in the steady state of the polarization conversion element can be lowered by 10 ° C. to 20 ° C. Therefore, a large margin on the heat resistance surface of the optical element such as the polarization conversion element can be secured, so that the reliability is improved. In other words, if an equivalent life is sufficient, a smaller optical element can be used under the same use conditions as before, and it is possible to cope with a display with high luminance while being downsized.

  If optical elements having the same life and the same size are used, it can be said that the illuminance can be improved accordingly.

  Furthermore, since the molded product 900 made of a magnesium alloy has higher impact resistance and vibration resistance than a molded product made of a resin, stable accuracy can be maintained and failure is unlikely to occur. In addition, the molded article 900 made of a magnesium alloy is highly reliable because the material hardly deteriorates unlike a molded article made of a resin. For example, when a molded product made of resin is exposed to ultraviolet rays from the light source part, a part of the resin is decomposed, and this decomposed product may adhere to the light source part or the optical component and deteriorate the performance. In the case of the molded product 900 made of the above, there is no such performance degradation. Furthermore, the molded article 900 made of a magnesium alloy has an advantage that it can be recycled.

  In addition, since the molded product 900 made of the magnesium alloy used for the lower light guide 901 itself has good conductivity, the molded product 900 itself made of the magnesium alloy (the lower light guide 901 itself) is fixed to the ground potential. If it is used, it can be used as a ground bus line. Therefore, if the ground from each substrate is dropped on the molded product 900 itself (lower light guide 901 itself) made of a magnesium alloy, the shield can be performed as it is. In addition, since the optical unit 10 occupies a wide area in the interior of the exterior case 2 of the projection display device 1, the optical unit 10 sufficiently functions as a shield material and also has a substrate at any location. Even if it arrange | positions, a board | substrate can be dropped to a ground directly from a board | substrate, without using an earth plate, or only using a small earth plate. Therefore, each substrate can be arranged above, below, or on the side of the optical unit 10 so that the degree of freedom with respect to the arrangement location of each substrate is high.

  Further, as shown in FIG. 13A, the light source lamp unit 8 is housed in a space 800. Therefore, the light source lamp unit 8 has a structure in which the upper surface and side surfaces thereof are covered with a shield material that is a molded product 900 made of a magnesium alloy. For this reason, noise generated when the lamp body 805 is turned on does not leak to the outside. Therefore, the projection display apparatus 1 according to the present embodiment has a simple structure and is fully equipped with EMI countermeasures. In addition, in the projection display device 1 of this embodiment equipped with a circuit for processing a weak video signal that is further increased in speed, the upper light guide 902 and the lower light guide 901 ensure that strong noise radiated from the lamp body 805 is generated. Therefore, reliability can be greatly improved.

  As shown in FIG. 11, the prism unit 910 is disposed on the bottom wall 92 in the head portion 903 of the lower light guide 901, and an optical component mounting unit configured integrally with the upper surface of the bottom wall 92 is provided. The portion 190A functions as a prism fixing plate. For this reason, in this embodiment, it is not necessary to use a separate prism fixing plate. In addition, since the lower light guide 901 is composed of a molded product 900 made of a thin magnesium alloy including the head portion 903, there is a sufficient space. Thus, in this embodiment, sufficient spaces 151 and 152 can be secured above and below the intake fan 15 disposed in the vent 150. Therefore, the cooling air can be taken in smoothly, and the cooling efficiency can be increased by suppressing the decrease in static pressure from the structural aspect. That is, since the cooling air sucked by the intake fan 15 flows in a laminar flow, the cooling air is smoothly sucked by the intake fan 15 and is smoothly supplied to the prism unit 910 because the fluid resistance is small. Is done. Therefore, the cooling efficiency is high.

  Note that a prism duct and a dust-proof mesh cover (not shown) may be disposed on the upper surface of the prism unit 910. In this way, foreign matter that has fallen, and dust intrusion when the cooling air flow path becomes negative pressure and flows backward when the power is turned off are prevented.

  In addition to the embodiment described above, the optical component positioning portions 190 shown in FIG. 15 are coupled to each other by a runner portion (not shown) at the time of molding, so that positioning accuracy is obtained. Even if the through-hole 909 is used to fix the molded product 900 made of the magnesium alloy by screwing or caulking, the same effect can be obtained.

2. Second Embodiment FIG. 16 shows a second embodiment of the present invention, which is different from the first embodiment in that only the light guide 100 is formed of a magnesium molded product. In addition to the light guide 10 ′, the optical component positioning portion 190 ′ is also formed of a molded product made of a magnesium alloy.

  In this case, the magnesium powder may be kneaded with the resin, and after molding, the resin portion may be scattered by heat or heat and pressure, and the molding may be performed integrally with the optical component positioning portion 190 by a molding method.

  In this embodiment and the third embodiment described below, the same structure and members used as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.

  Recently, in the magnesium molding method, molding processing similar to resin molding is possible in a solid-liquid state using thixotropy. By adopting this processing method, there are advantages such as I. Thin-wall molding is possible, II. Dimensional accuracy is high, and machining for dimensioning is not required, and III. Strength improvement is achieved by increasing the molding density.

  However, on the other hand, I. It is necessary to consider hot water flow, II. Prevention of biting into the mold is indispensable, III. Buffer structure that realizes shock resistance when supporting and guiding optical components directly with magnesium material There are problems such as becoming indispensable.

  Hereinafter, this point of view will be described in detail.

  In the second embodiment, since the optical component positioning portion 190 ′ is also a magnesium molded product, the shape of the positioning portion 190 ′ is changed with respect to the resin positioning portion 190.

  That is, as shown in detail in FIGS. 16 and 17, first, a non-flat optical component, that is, a part A-190 ′ for positioning the condenser lenses 951 to 953 and the intermediate lens 973 is a main body having a height dimension of H. It has a portion 199 ′, a guide portion 198 ′ having a height dimension h, and a receiving portion 195 that supports the lower end portion of the lens 951 and the like. The guide portion 198 ′ protrudes outward from the main body portion 199 ′ and is formed in a groove shape that sandwiches both side surfaces of the lens 951 and the like, and its height h is 1/2 <H <3/4. However, it is preferably about 1/2 to 2/3 of the height dimension H of the main body 199 '. The height dimension H of the main body is formed to be approximately the same as the lens diameter. The receiving portion 195 is also formed so as to sandwich both side portions of the lens 951 and the like, and a rib 196 for reinforcing and hot water flow improvement is formed on the opposite side of the guide portion 198 ′ in the main body portion 199 ′. .

  Here, the height of the guide portion 198 ′ is reduced as long as the lens 951 or the like can be guided. Since the lens 951 or the like is a disk, the height of the guide portion 198 ′ is not necessarily the same as that of the lens 951 or the like. This is because it is not necessary to have the same diameter, and the molding process is facilitated.

  Of the optical component positioning portion 190 ′, flat optical components, that is, the positioning portions B-190 ′ for the integrator lenses 921 and 922, the polarization conversion element 920, and the mirrors 941 to 943, 971 and 972 are shown in FIGS. As shown in FIG.

That is, a groove-shaped receiving portion 982 that is integrally formed with the lower light guide 901 on the bottom surface of the lower light guide 901 and supports the lower portion of the mirror 941 and the like, and is formed integrally with the lower light guide 901 on the side surface of the lower light guide 901. consists of upper and both planes, such as mirror 941 in the two upper support portions 983 for supporting these upper support portion 983 a pair of positioning members 983A arranged offset in the vertical direction, are formed respectively at 983B. In addition, one of the two surfaces in contact with the mirror 941 and the like in the receiving portion 982 and the upper support portion 983 is an attachment reference surface 984, and the draft of the attachment reference surface 984 is, for example, 0 ° to 0.008 °. It has become. Further, the draft angle of two surfaces different from the attachment reference surface 984 is 1 to 20 °. In this way, by providing the receiving portion 982 and the upper support portion 983 with a gradient, it is possible to prevent biting of the mold due to shrinkage after molding.

  As shown in FIG. 20, the mirror 941 or the like is not rattled between the other two surfaces other than the attachment reference surface 984 in the receiving portion 982 and the upper support portion 983 and the mirror 941 and the like. In order to support, a cushioning material 985 made of an elastic member such as sponge, tape and resin is disposed.

  According to such a second embodiment, the same effect as the first embodiment can be obtained, the shock applied to the mirror and the lenses by the buffer material 985 can be buffered, and since there is no resin portion, A molded article made of a magnesium alloy has an effect that the specific gravity is smaller than that of a molded article made of a resin, and the advantages of being excellent in terms of heat dissipation and strength can be maximized.

  Further, since there is no resin portion, the exposed area of the molded product made of a magnesium alloy having high heat dissipation is wide, which is advantageous in terms of heat dissipation. Further, since there is no resin molding portion, secondary processing such as deburring after resin molding can be omitted completely, which is advantageous for cost reduction.

Furthermore, although the height dimension of the guide part 198 ′ of the positioning part such as the condenser lens 951 is lower than the diameter of the lens 951 etc., it is formed in a dimension that can be guided, so that the flow of hot water is reduced in the molding process. Easy to process .
Further, the positioning portion such as the mirror 941 is composed of a receiving portion 982 and two upper support portions 983 , and has a structure that supports three plate-like optical components such as the mirror 941. By forming the two upper support portions 983 , the positioning portion can be made not to be a continuous groove, the weight is reduced, and a space can be secured as much as there is no groove in the middle.
Here, since the buffer material 985 is packed between the other two surfaces other than the attachment reference surface 984 such as the receiving portion 982 and the mirror 941 or the like, the mirror 941 and the like are supported without backlash. be able to.

3. Third Embodiment FIGS. 21 and 22 show a third embodiment of the present invention. In this embodiment, the outer case is formed of a magnesium alloy in addition to the light guide, the head portion, and the optical component positioning portion. The outer case and the light guide are integrated. Other parts are the same as those in the above-described embodiment.

  In the projection display device 1 ′ of the present embodiment, the outer case 2 ′ including the lower case 4 ′ is formed of a molded product made of a magnesium alloy, and such an outer case 2 ′ has a large area. Magnesium molten metal) is formed so as to be fully dispersed. That is, as shown in FIG. 23, a concave portion 211 is provided on the opposite side of the gate 210 formed in the exterior case 2 ′ and at one corner (for example, in the vicinity of the lamp housing portion) with the corner interposed therebetween, A discard runner 212 is provided in the concave portion 211. Then, after removing the runner 212, the concave shape portion 211 is subjected to, for example, embossing, thereby avoiding defects in the appearance of the exterior case 2 '. Further, on the opposite side of the gate 210, for example, a plurality of ribs 213 protruding from the surface are formed in a wave shape as a whole, and in the unlikely event, nests, hot water wrinkles, sink marks, etc. are located far from the gate 210. Even if they occur, they are inconspicuous. The gate 210 has a shape that extends outward from the outer case 2 ′, and is formed so that the plate thickness decreases as it goes outward.

  Although not shown, a rib for securing a hot water flow is also laid on the opening (for example, the operation switch) of the exterior case so that the hot water can sufficiently flow around the opening during molding.

  The optical component positioning portion 190 'for positioning the mirror 941 and the like must be provided with a plurality of holes through which the sliding portion is allowed to escape from the lower case due to the mold configuration.

  In addition to the light guide, the outer case is also formed of a magnesium alloy, so that the shield case constituting the power supply unit 7 can be made unnecessary as shown in FIG. This is because the light guide and the outer case can have a shielding function. And when not providing the shield case which comprises the power supply unit 7 in this way, as shown in FIG. 24, while forming the groove-shaped receiving part 73 along the longitudinal direction of lower light guide 4 ', this A plurality of ribs 74 orthogonal to the groove-shaped receiving portion 73 are provided. Then, the end portions of the substrates 77 may be accommodated in the receiving portion 73 and fixed by the bracket 75 and the screw 76 having an L-shaped cross section. In addition, what is necessary is just to cover the circuit block etc. inside the power supply unit 7 with a resin board etc., when a specific flow path is made and cooling is required. Therefore, it is possible to reduce the size and weight of the product while sufficiently supporting EMI.

  A primary filter 78 is disposed at one corner in the exterior case 2 ′, and a primary active filter 79 and a rectifier circuit (diode bridge) 80 are disposed at the opposite corner. Further, a heat radiating plate 81 is disposed on the substrate 77, and a chopper circuit drive FET and a backflow preventing diode 82 are attached to the heat radiating plate 81.

  Here, as shown in FIG. 25, the height ratio of the lower light guide 901 and the upper light guide 902 of such a light guide is the total height of the lower light guide 901 and the upper light guide 902. When R is R and the height dimension of the lower light guide 901 is r, 1 / 2R <r <3 / 4R, and preferably r = 2 / 3R. Therefore, when installing the apparatus on the ceiling, wall surface, etc., it is not necessary to hold the apparatus main body with the holding tool and attach the hanging tool to the holding tool, and install the hanging tool directly on the exterior case 2 ′. It is possible.

  This ratio may be the same in the first and second embodiments.

  Thus, in order to form in a short time of 25/1000 seconds, thin-wall molding is established by setting the shape and dimensions so as not to impair the hot water flowability. Further, the height of the guide portion (not shown) of the portion A-190 'for positioning the condenser lenses 951 to 953 and the intermediate lens 973 is also made the minimum necessary. The same applies to the guide part of the positioning part B-190 'for flat optical components such as the mirrors 941 to 943. As described above, by minimizing the height of the guide portion, it is possible to prevent the thin and long optical component positioning portion from being collapsed by hot water molded at high speed and high pressure, and to improve the positioning accuracy.

  The projection display device 1 ′ according to the present embodiment is strong even though the device is lightweight because the exterior case 2 ′ is formed of a molded product made of a magnesium alloy. It can be used.

  That is, as shown in FIG. 22, at least two or more bosses 215 formed on the back surface of the exterior case 2 ′ are tapped, while the hanger 216 surrounds the exterior case 2 ′ from the outside. Is provided. The hanger 216 rises from the back surface of the outer case 2 ′ along both side surfaces, and the projection display device 1 ′ can be hung on the ceiling, for example. That is, after attaching the hanger 216 from the outside of the case 2 'by screwing the screw into the tap of the boss 215, the flange 216A is pressed against the ceiling and fixed with a bolt or the like. Because of the magnesium case, it is sufficiently strong to withstand the use of a threaded boss that suspends the body.

  According to the third embodiment, the same effects as those of the first and second embodiments can be obtained, and the exterior case 2 ′ is also a molded product made of a magnesium alloy. As compared with the projection display device of the second embodiment, the light weight and heat dissipation are further improved, and the strength is also improved. In addition, since the weight is reduced, the derivative development of the product can be easily expanded, for example, by hanging it on the ceiling. Furthermore, it also has the function of a heat radiating plate of the optical unit, thereby suppressing the heat generation of the optical elements and improving the reliability or increasing the illuminance. Furthermore, since the dependence on the cooling fan can be suppressed, it contributes to the miniaturization and thinning of the main body by reducing the size of the fan and the number of installations. In addition, the use of magnesium vibration absorption and the fan rotation speed can be reduced. It is also possible to reduce noise by reduction. In addition, since the exterior case is made of a molded product made of magnesium alloy, it is possible to reduce the number of parts that have a shielding function, such as the chassis to which the audio board is attached and shielded, the shield plate of the power supply unit, and the weight and cost can be reduced. .

(Other embodiments)
As shown in FIG. 26, the rear projection display apparatus 1A may be configured by using the optical unit 10 in the first embodiment. In this case, the light emitted from the optical unit 10 is reflected by the mirrors 101A and 102A and projected onto the lenticular screen 103A (projection surface).

  In the first embodiment, a light guide of a molded product made of a magnesium alloy and a resin outer case 2 are combined. In the third embodiment, the light guide and the outer case 2 ′ are molded of a magnesium alloy. However, the present invention is not limited to this. For example, the light guide and the exterior may be separately formed of a molded product made of a magnesium alloy, and these may be combined.

  In this way, the same effects as those of the above embodiments can be obtained, and an increase in the cost of the exterior case (modification for molding quality and appearance quality) can be suppressed, and an optical unit In the OEM, it is possible to obtain the effect that both can be sold separately without being influenced by the appearance design.

In the second embodiment, the buffer material 985 is packed between the other two surfaces other than the attachment reference surface 984 such as the receiving portion 982 and the mirror 941 to eliminate the backlash of the mirror 941 and the like. However, the present invention is not limited to this. For example, as shown in FIG. 27, a tape or a resin material 905 may be attached to a surface different from the attachment reference surface 904 such as the receiving portion 908 by adhesion or outsert.
In this way, the mirror 941 and the like can be supported without backlash.

  Since the optical unit of the present invention can improve the weight and heat dissipation performance by improving the material of the member used, and can achieve high reliability, the optical unit of the projection display device used in home theaters and presentations Useful as.

The figure which shows the projection type display apparatus in 1st Embodiment. The figure which shows the projection type display apparatus in the said embodiment. The figure which shows the projection type display apparatus in the said embodiment. Explanatory drawing which shows the planar arrangement structure of the optical unit comprised inside the projection type display apparatus in the said embodiment. The perspective view which shows the optical unit in the said embodiment, and the board | substrate covered on it. Sectional drawing which shows typically the internal structure of the projection type display apparatus in the said embodiment. The top view which shows the state which mounted various optical components in the lower light guide shown in FIG. Sectional drawing in the AA of FIG. Sectional drawing in the BB line of FIG. Sectional drawing in the CC line | wire of FIG. Sectional drawing in the DD line | wire of FIG. The perspective view of the light source lamp unit in the said embodiment. The perspective view of the lower light guide in the said embodiment. The perspective view which shows the part of the molded article which consists of magnesium alloys of the lower light guide in the said embodiment. The perspective view which shows the resin part of the lower light guide in the said embodiment. The perspective view which shows the lower light guide in 2nd Embodiment. The side view which shows the positioning member of the lens in the said embodiment. The side view which shows the positioning member of the reflective mirror in the said embodiment. The top view which shows the positioning member of the reflective mirror in the said embodiment. The top view which shows the principal part of the positioning member of the reflective mirror in the said embodiment. The perspective view which shows the exterior case and lower light guide in 3rd Embodiment. The top view which shows the exterior case and lower light guide in the said embodiment. The top view which shows the state at the time of the shaping | molding process of the exterior case in the said embodiment. Sectional drawing in the AA of FIG. Sectional drawing which shows the ratio of the upper and lower cases of the exterior case in the embodiment. The block diagram of the rear type | mold projection display apparatus of the deformation | transformation form of 1st Embodiment. The side view which shows the deformation | transformation form of the positioning member of the reflective mirror of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 1 ', 1A ... Projection type display apparatus, 2, 2' ... Exterior case, 6 ... Projection lens unit (projection optical system), 7 ... Power supply unit, 8 ... Light source lamp Unit (light source unit), 10... Optical unit, 100, 10 ′, light guide, 190, 190 ′, optical component positioning unit, 190A, optical component placement unit, 198A, step , 198 '... guide portion, 199 ... resin portion, 199' ... main body portion, 900 ... molded product made of magnesium alloy, 901 ... lower light guide, 903 ... head portion, 909... Resin through hole, 910... Prism unit (color synthesis optical system), 924... Color separation optical system, 925 R, 925 G, 925 B .. liquid crystal light valve, 920, 921, 922, 941 943, 9 DESCRIPTION OF SYMBOLS 1,972 ... Flat plate optical component, 951-953,973 ... Non flat plate optical component, 982 ... Receiving part, 983A, 983B ... Positioning member (support part), 984 .. -Reference mounting surface, 985 ... cushioning material.

Claims (13)

Optical used in a projection display device that optically processes a light beam emitted from a light source unit to form an optical image corresponding to image information, and enlarges and projects this optical image on a projection surface via a projection optical system. A unit,
A color separation optical system that separates a light beam emitted from the light source unit into a plurality of color light beams, a plurality of light valves that modulate the separated light beams of each color based on image information, and the light valves are modulated via the light valves. A color combining optical system for combining the modulated light beams of the respective colors, and a projection optical system for enlarging and projecting the modulated light beam combined by the color combining optical system toward the projection surface,
The light source unit, the color separation optical system, the light valve, the color synthesis optical system, and the projection optical system are supported by a light guide using a molded product made of a magnesium alloy,
The light guide includes an optical component positioning unit for positioning and fixing the optical component constituting the color separation optical system or the light valve,
Positioning portion for positioning the plate-shaped optical component of the optical component positioning unit includes a receiving portion for supporting sandwiching both faces of the tabular optical components to be positioned, flat optical components being pre-Symbol positioned Two support portions that support the opposite planes of
The positioning part for positioning the flat plate-shaped optical component has a structure that supports the flat plate-shaped optical component that is positioned by the receiving unit and the two support units at three points .
The support portions are respectively arranged at positions shifted in the plane direction of the flat plate-shaped optical component to be positioned, and are configured by a pair of positioning members that support the flat plate-shaped optical component with the planes facing each other. An optical unit characterized by that. The optical unit according to claim 1,
An optical unit, wherein the light guide is integrally configured with a head portion for mounting the color synthesis optical system and the projection optical system. The optical unit according to claim 2, wherein
The optical unit according to claim 1, wherein the head unit includes an optical component mounting unit having a step for positioning and fixing a prism constituting the color synthesis optical system. The optical unit according to any one of claims 1 to 3,
The optical unit, wherein the head part and the optical component positioning part are formed of a molded product made of the magnesium alloy and are integrated with the light guide. The optical unit according to claim 4,
The positioning part for positioning the non-flat optical component among the optical component positioning parts has a guide part for guiding the side end surface of the non-flat optical part to be positioned, and the height dimension of the guide part is An optical unit, wherein the optical unit is lower than an outer dimension of the non-flat optical component to be positioned. The optical unit according to claim 5,
The optical component positioning portion has the guide portion and a main body portion,
The optical unit according to claim 1, wherein a height dimension of the guide portion is in a range of 1/2 to 3/4 of a height dimension of the main body portion. The optical unit according to any one of claims 1 to 6,
The draft angle of the mounting reference surface of the three-point support structure for positioning the flat optical component is 0 ° to 0.008 °, and the draft angle of the other two side surfaces other than the mounting reference surface is 1 ° to An optical unit characterized by being 2 °. The optical unit according to claim 7,
In the gap between the other two surfaces and the end of the flat plate-shaped optical component to be positioned, the flat plate-shaped optical component that is positioned by pressing the flat plate-shaped optical component to be positioned against the mounting reference surface An optical unit comprising a buffer member for preventing rattling.   The optical unit according to claim 1, a power supply unit for driving the light source unit and the like, and an outer case for housing the power supply unit and the optical unit. Projection display device. The projection display device according to claim 9, wherein
The exterior case and the head portion are formed using a molded product made of a magnesium alloy similar to the light guide, and the exterior case, the head portion, and the light guide are integrally formed. Projection display device. The projection display device according to claim 9, wherein
The exterior case and the head portion are formed using a molded product made of a magnesium alloy similar to the light guide, and the exterior case and the light guide are formed separately. apparatus. The projection display device according to any one of claims 9 to 11,
The projection display device, wherein the light guide and the outer case are set to a ground potential and used as a shielding material. The projection display device according to any one of claims 9 to 12,
Among the upper and lower light guides constituting the optical unit, the height of the lower light guide is 1/2 to 2/3 of the total height of both light guides. .

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