JPH10288812A - Optical unit and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical unit and a projection type display device which can be reduced in weight, improved in heat radiating performance and enhanced in reliability by improving the material of an applied member. SOLUTION: In the optical unit 10 of the projection display device 1, a light source lamp unit 8, a color separation optical system and liquid crystal light valve 925R, 925G and 925B are incorporated in a lower light guide 901 using molding 900 consisting of a magnesium alloy which is light in weight, excellent in the property of radiating heat and further, with high strength. Optical components constituting the color separation optical system, etc., are arranged in a groove-like optical component positioning part 190 consisting of a resin part 199 molded by the outersert molding of the molding 900 consisting of the magnesium alloy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of decomposing a light beam from a light source into three color light beams, modulating each of these color light beams through a light valve composed of a liquid crystal panel in accordance with image information, and modulating the light beams. The present invention relates to a projection display device that recombines modulated light beams of respective colors and projects the enlarged light onto a screen or the like via a projection optical system, and an optical unit used for the same. More specifically, the present invention relates to a mounting structure of an optical component used for such an optical unit.

[0002]

2. Description of the Related Art A projection display apparatus basically comprises the following components. That is, a light source lamp unit (light source unit), an optical system that optically processes a white light flux emitted from the light source lamp unit so that a color image corresponding to image information from a TV, a personal computer, or the like can be synthesized;
This is a group of circuit boards on which a projection lens unit that projects the combined light beam on 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 inside the outer casing of the apparatus, and the projection lens unit is generally mounted so as to protrude from the front of the apparatus.

Here, the optical system includes a color separation optical system that separates a white light beam emitted from a light source lamp unit into three primary color light beams, and three light beams that modulate the separated light beams of each color based on image information. A liquid crystal light valve; a color combining optical system for combining modulated light fluxes of respective colors modulated through the liquid crystal light valve; The light source lamp unit, the color separation optical system, the liquid crystal light valve, and the like are conventionally arranged in a resin light guide with a predetermined layout. On the other hand, the color combining 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 they are arranged as an optical unit together with the power supply unit and the circuit board group in the outer case of the apparatus.

Further, as described above, various optical components are mounted on the optical unit, and it is necessary to adjust their optical axes. Therefore, various optical axis adjusting mechanisms are configured. In addition, since the projection display apparatus generates considerable heat from the light source lamp unit, the color combining optical system, and the power supply unit, various cooling mechanisms are incorporated. Generally, the outside air is introduced by the intake fan from the vent of the outer case,
Air is exhausted after flowing outside air through the internal heat source.

[0005]

Most of the projection type display devices of this type are used for the purpose of, for example, bringing them into a conference room as needed and projecting conference materials on a screen, rather than a completely stationary type. Is done. For this reason, it is desired that the projection display device be lightweight enough to be portable.

However, in the conventional projection display device, a light guide made of resin is used so that the optical axes of various optical components do not shift even when considerable heat is generated from the light source unit, the color combining optical system, and the power supply unit. Is thickened to increase its strength, so that there is a problem that the size and weight of the projection display device cannot be reduced. In addition, if the thickness of the light guide is increased in addition to the low heat radiation of the resin itself, the heat radiation from the optical unit will be reduced accordingly, and the optical components will become hot,
Unless optical components are used with a large safety factor, there is also a problem that reliability is reduced.

In addition, there is a problem that EMI countermeasures are difficult because circuits for processing a high-speed and weak video signal and a light source lamp that generates strong noise coexist.

In view of the above, the object of the present invention is to improve the material of the member used, thereby achieving weight reduction and improvement of heat radiation performance and high reliability. An object is to provide an optical unit and a projection display device.

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

[0010]

According to the present invention, a light beam emitted from a light source section is optically processed to form an optical image corresponding to image information, and the light image is projected onto a projection optical system. An optical unit for a projection display device for magnifying and projecting onto a projection surface via a system, wherein the color separation optical system separates a light beam emitted from the light source unit into light beams of a plurality of colors; A plurality of light valves for modulating a light beam of each color based on image information; a color combining optical system for combining modulated light beams of each color modulated via the light valve; and a modulated light beam combined by the color combining optical system A projection optical system for enlarging and projecting toward the projection surface, the light source unit, the color separation optical system, the light valve, the color combining optical system,
Further, the projection optical system is supported by a light guide using a molded product made of a magnesium alloy.

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

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

[0013]

[Table 1]

Further, since the light guide has a sufficient strength even if the light guide is made thin, the light weight of the optical unit can be further reduced by the thinned light guide. Further, when the light guide is made thinner, the heat dissipation is increased by that much, and in addition, there is more space in the projection display device.
Sufficient space can be ensured before and after the intake fan arranged in the ventilation port of the outer case, so that the intake of cooling air can be made smoother, so that the cooling efficiency can be improved in terms of structure. Therefore, a rise in the internal temperature can be suppressed, and a substantially large heat-resistant margin of an optical element such as a polarization conversion element can be ensured, so that reliability is improved. In addition, a molded product made of a magnesium alloy has higher impact resistance and vibration resistance than a molded product made of a resin, so that stable accuracy can be maintained and a failure hardly occurs. Moreover, since the molded article made of a magnesium alloy hardly deteriorates in material unlike the molded article made of a resin, the reliability is high. For example, when a molded product made of resin receives ultraviolet rays from the light source, a part of the resin is decomposed, and the decomposed product may adhere to the light source or the optical component and deteriorate the performance. In the case of a molded article consisting of, there is no such deterioration in performance. Furthermore, there is an advantage that a molded article made of a magnesium alloy can be recycled.

Table 2 shows some examples of magnesium alloys.

[0016]

[Table 2]

In the present invention, it is preferable that the head portion and the groove-shaped optical component positioning portion are formed of a molded product made of a magnesium alloy and are integrated with the light guide.

According to this configuration, when the color combining optical system and the projection optical system are mounted on the light guide using a separate head body, the light guide and the head body may be interposed between the light guide and the head body. Whereas the combined play and tolerance variations are unavoidable, if the head is integrated with the light guide, there is no variation in the combined play and tolerances, so the light guide must have a color combining optical system and a projection optical system. It can be mounted accurately with a simple method such as screwing. Therefore, since the optical axis adjustment is not required, the production cost can be reduced. Further, the light guide does not need to be provided with a complicated positioning mechanism and an adjusting mechanism.

In the present invention, it is preferable that an optical component mounting section having a step for positioning and fixing a prism constituting the color synthesizing optical system is provided in the head section.

In the present invention, the light guide includes:
It is preferable that an optical component positioning portion for positioning and fixing the optical component constituting the color separation optical system or the light valve is configured.

According to this structure, after inserting the optical component into the groove-shaped optical component positioning portion,
Since it is sufficient to fix the optical component with an adhesive or the like, a large number of springs or the like for applying a lateral pressure to the optical component and positioning the optical component are unnecessary. Therefore, the number of parts can be reduced, so that it is possible to reduce the cost of parts and automate the assembly.

Such an optical component positioning portion may be constituted by a resin portion integrated with a molded product made of the magnesium alloy.

In this case, it is preferable that the resin portion constituting the optical component positioning portion is formed by integral molding with the molded product made of the magnesium alloy. In other words, a structure that cannot be formed by magnesium die-casting, or a part that needs to form a highly accurate positioning part is handled by resin molding.

[0024] In this case, a resin through hole is formed in a portion of the molded product made of the magnesium alloy where the optical component positioning portion is formed, and the optical component positioning portion is formed in the resin component. At the time of integral molding with the molded product made of the magnesium alloy, the resin portion constituting the optical component positioning portion is solidified by allowing the resin to flow through the resin through hole to the back side so as to sandwich the molded product made of the magnesium alloy. It is preferable to fix it to a molded article made of the magnesium alloy.

With this configuration, even when the resin part is provided only partially in the molded article made of the magnesium alloy, the resin part does not fall off the molded article made of the magnesium alloy.

In the present invention, it is preferable that the head portion and the groove-shaped optical component positioning portion are formed of a molded product made of a magnesium alloy and are integrated with the light guide.

In this case, since there is no resin portion,
A molded article made of a magnesium alloy can make maximum use of the features that it has a lower specific gravity than a molded article made of a resin and is excellent in heat dissipation and strength. In addition, since there is no resin portion, the exposed area of the molded product made of a magnesium alloy having high heat dissipation is large, which is also advantageous in terms of heat dissipation. Furthermore, since there is no resin molding part, secondary processing such as cutting for dimensioning after resin molding can be completely omitted, which is advantageous for cost reduction.

In the present invention, the positioning portion for positioning the non-flat optical component among the groove-shaped optical component positioning portions has a guide portion for guiding the side end surface of the optical component, and the height of the guide portion The dimensions are preferably smaller than the outer dimensions of the non-flat optical component.

Here, the height dimension of the guide portion is only required to be able to guide and support half or more of the outer dimensions of the non-flat optical component.

In this case, since the height of the guide portion is small, the magnesium is easily formed and the weight is reduced.

In the present invention, the positioning portion for positioning one side surface of the flat optical component among the groove-shaped optical component positioning portions has a guide portion for guiding a side end surface of the optical component. It is preferable that the height dimension is lower than the outer dimension of the flat optical component.

Here, the height dimension of the guide portion is only required to be able to guide and support half or more of the outer dimensions of the flat optical component.

In this case, since the height of the guide portion is small, magnesium can be easily formed and the weight can be reduced.

In the present invention, the groove-shaped optical component positioning portion has a guide portion and a main portion, and the height of the guide portion is in the range of 1/2 to 3/4 of the height of the main portion. It is preferred that

In this way, it is possible to have a height which can guide the optical component, and it is easy to mold the magnesium.
Weight is also reduced.

In the present invention, the positioning portion for positioning the other side surface of the flat optical component in the groove-shaped optical component positioning portion includes a lower receiving portion and an upper portion for supporting the lower and upper surfaces of the optical component with both planes interposed therebetween. It is preferable to have a three-point support structure of an upper support portion which is alternately arranged in two places in the up-down direction and supports each other with a plane opposed to each other therebetween.

In this way, the lower support portion and the upper support portion may be formed, and it is not necessary to form a continuous groove.
The weight can be reduced, and a space can be secured as much as there is no groove in the middle.

In the present invention, the draft of the mounting reference plane for positioning the optical component is set to 0 ° to 0.008 °, and the draft of the other two sides other than the mounting reference plane is set to 1 ° to 2 °. It is preferred that

In this way, since the optical component can be attached by pressing it against the reference surface, it can be easily attached at an accurate position, and a normal image can be obtained.

In the present invention, a cushioning member is provided in the gap between the other two surfaces other than the reference surface and the end of the optical component for pressing the optical component against the reference surface and preventing the optical component from rattling. Is preferably performed.

Here, examples of the cushioning member include elastic members such as sponge, tape, and resin.

According to this configuration, after the optical component is pressed against the reference surface, the buffering member is packed on the opposite side of the reference surface, so that the optical component and the like are prevented from rattling and the optical component can be securely held.

The optical unit configured as described above is housed in an outer case together with a power supply unit for driving the light source unit and the like, and is used to configure a projection display device or the like.

According to this structure, since the light guide is formed of a molded product made of a magnesium alloy, the light guide has a sufficient strength even if the light guide is made thin, and the light guide further increases the light guide. The weight can be reduced. Furthermore, when the light guide is made thinner,
In addition to increased heat dissipation, there is also room for space inside the projection display device, so there is sufficient space before and after the intake fan placed in the ventilation hole of the outer case to smoothly take in cooling air Thus, the cooling efficiency can be improved also from the viewpoint of the structure. Therefore, a rise in the internal temperature can be suppressed, and a substantially large heat-resistant margin of an optical element such as a polarization conversion element can be ensured, so that reliability is improved. In addition, molded products made of magnesium alloy have higher impact resistance and vibration resistance than molded products made of resin, so stable accuracy can be maintained,
Less likely to break down. Moreover, since the molded article made of a magnesium alloy hardly deteriorates in material unlike the molded article made of a resin, the reliability is high. For example, when a molded product made of resin receives ultraviolet rays from the light source, a part of the resin is decomposed, and the decomposed product may adhere to the light source or the optical component and deteriorate the performance. In the case of a molded article consisting of, there is no such deterioration in performance. Furthermore, there is an advantage that a molded article made of a magnesium alloy can be recycled.

The projection type display device according to the present invention is characterized in that:
An optical unit according to any one of the above, a power supply unit for driving a light source unit and the like, and an outer case for housing the power supply unit and the optical unit, the outer case and the head unit are configured with the optical unit and It is formed using a molded product made of a similar magnesium alloy, and
It is preferable that the outer case, the head unit, and the optical unit are integrally formed.

According to this structure, since the outer case is also formed of a molded product made of a magnesium alloy, it is possible to further reduce the weight and size of the projection display device in addition to the effects of claim 13. It can be easily suspended from the ceiling and used.

The projection display apparatus of the present invention comprises a power supply unit for driving a light source unit and the like, and an outer case for housing the power supply unit and the optical unit.
It is preferable that the outer case and the head are formed using a molded product made of the same magnesium alloy as the optical unit, and that the outer case and the optical unit be formed separately.

In this way, it is possible to avoid the risk of increasing the cost of the outer case (repairing for molding quality and appearance quality), and to improve the heat radiation performance of the outer case. Further, since the outer case and the optical unit can be sold separately, sales become easier.

In the projection display device having such a configuration, it is preferable that the light guide and the outer case are set to a ground potential and used as a shielding material.

In this manner, in the lamp emission state, an arc discharge is caused between the electrodes of the lamp, so that strong noise is emitted to the outside. This noise is further concentrated and emitted by the reflector. Since this can be completely shielded by the upper and lower light guides and the outer case set to the ground potential, it is possible to prevent adverse effects on a circuit for processing a weak and high-speed signal. As a result, the EMI margin can be increased, and it is possible to cope with a high-speed signal accompanying higher definition. In addition, the light guide and the outer case can also serve as a reliable ground bus line of the circuit board adjacent to the light guide and the outer case. Further, it can also serve as a shield for the power supply line and the lamp drive line on the primary side.

In the projection display device of the present invention, the height of the lower light guide among the upper and lower light guides constituting the optical unit is 1/2 to the total height of both light guides.
It is preferably 2/3.

In this way, various components can be stably mounted on the lower light guide.

[0053]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a projection display device according to an embodiment of the present invention.

1. 1. First Embodiment (Entire Configuration) FIGS. 1A and 1B are a front view and a rear view of a projection display device of the present embodiment, respectively. FIG. 2 (A),
(B) is a plan view of the projection display device of the present embodiment,
It is a bottom view. 3A and 3B are a right side view and a left side view of the projection display device of the present embodiment, respectively.

In these figures, a projection type display device 1 according to this embodiment has a rectangular parallelepiped resin outer case 2.
have. The outer case 2 basically includes an upper case 3, a lower case 4, and a rear case 5 defining a rear surface of the apparatus. A front end portion of the projection lens unit 6 protrudes from the center of the front surface of the apparatus.

FIG. 1B shows a rear wall 5d of the rear case 5.
As can be seen, AC inlet 3 for external power supply
6 and various input / output terminal groups 50 are arranged. Therefore, since the signal cable or the like is not usually placed on the side of the device where the user is located, the usability is good.

(Structure of Exterior Case) Upper Case 3
Is formed from a rectangular upper wall 3a, left and right side walls 3b, 3c and a front wall 3d extending substantially vertically downward from three sides excluding the rear side. Similarly, the lower case 4 is formed of a rectangular bottom wall 4a, left and right side walls 4b, 4c and a front wall 4d which stand substantially vertically from three sides excluding the rear side. The rear case 5 basically has a structure for guiding and holding the spigot 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 from the inside (not shown). It is held in a state of being locked with a hook portion (not shown).

Upper case 3 and lower case 4
Has a circular opening 52 around which an annular rim 51 is formed, and a central portion of the projection lens unit 6 is curved. A front end portion extends toward the front of the apparatus. On the lower surface side of the front end portion of the projection lens unit 6 protruding from the outer case 2, a guard portion 53 is provided for assisting a hand when lifting the front end side of the apparatus.
Is a thick rim that covers the tip of the projection lens unit 6 in a hood shape.

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

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

At the left and right corners of the rear end of the bottom wall 4a of the lower case 4, feet 31R and 31L are arranged, of which the foot 31R can mainly adjust 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 by pressing a foot button 310 arranged on the upper end portion of the front wall 3d of the upper case 3, the apparatus body can be moved up and down with one hand. Orientation (projection direction from 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 center front side. A large number of ventilation holes 28 are formed in the air filter cover 23, and air is sucked into the exterior case 2 from these ventilation holes 28.

A lamp replacement cover 27 is attached to the bottom wall 4a of the lower case 4 at a position corresponding to the light source lamp unit 8 (described later) incorporated in the outer case 2. The replacement lid 27 is screwed to the lower wall 4a. If the screw is loosened and the lamp replacement lid 27 is removed, the light source lamp unit 8 can be replaced. 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.

(Attaching Structure of Handle) 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 38a, 38b of the handle 38 are rotatably mounted on the mating surfaces of the upper case 3 and the side walls 3b, 4b of the lower case 4. The side wall 4b of the lower case 4 is formed with a recess 3e for storing a handle, and the handle 38 can be stored here.

As shown in FIG. 4, the light guide 100 housed in the outer case 2 has a connection portion between the right side and the front end surface and a connection portion between the right side and the rear end surface. The oblique sides 101 and 102 are configured as a whole. Therefore, these hypotenuses 101, 1
02 and the outer case 2 are widened. Therefore, in this example, when the handle 38 is attached to the side surface of the outer case 2 as shown in FIG. 3A, the attachment portions of the base portions 38a and 38b are attached to the oblique sides 101, 1
02 is set at a portion corresponding to the wide gap formed by the gap.

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

As can be seen from FIG. 3B, the side walls 3c, 4c of the upper case 3 and the lower case 4, which define the opposite side surface of the device, are placed in a state of crossing over both of them. The pad lower 381 and the back upper 382 are arranged when the camera is placed on a desk with the computer downward.

(Structure Inside Outer Case) FIG. 4 shows the arrangement of each component in the outer case 2 of the projection display device 1. As shown in this figure, a power supply unit 7 is disposed inside the exterior case 2 on the right end side toward the front of the device. 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 the 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 includes a light guide 100 composed of upper and lower light guides 901 and 902, and the projection lens unit 6. It is roughly configured. The light guide 100 is integrated with the projection lens unit 6 and is fixed to the lower case 4 with fixing screws.

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

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

Although not shown, the power supply unit 7
Each component is built in a metal shield case, and electrical and magnetic noise generated in this portion is prevented from leaking outside. The shield case used for this constitutes a passage when the cooling air flows inside the power supply unit 7 and constitutes a passage for the cooling air flowing from the power supply unit 7 to the light source lamp unit 8. Further, the shield case is provided with the power supply unit 7.
AC input line, lamp replacement lid 27
A safety switch such as an interlock switch that automatically shuts off the power supply to the light source lamp unit 8 in conjunction with the opening and closing of the lamp lid 27 in conjunction with the opening operation of the lamp is installed, and the output to the light source lamp unit 8 is provided. It also covers lines, etc., and blocks the noise generated from it.

As described above, by utilizing the fact that the optical unit 10 has a flat L-shape, the power supply unit 7 is also formed with a flat L-shape, and when these are combined, the power unit 7 is partitioned by the optical unit 10 and the outer case 2. The waste area is not wasted. Therefore, since the optical unit 10 and the power supply unit 7 can be arranged in a narrow area, the size of the projection display device 1 can be reduced.

As shown in FIG. 6 (A), a cooling air intake fan 15 is provided on a bottom portion of the outer case 2 which is located below a prism unit 910 constituting a color synthesizing means to be described later. A cooling air intake 150 is provided.

On the other hand, on the rear end side of the apparatus, an exhaust port 160 provided with an exhaust fan 16 is formed for the rear case 5,
The exhaust port 160 is formed as a projecting portion 501 that partially projects from the rear case 5. in this way,
By moving the exhaust port 160 away from the exhaust fan 16, rubbing noise can be prevented.

(Arrangement Structure of Substrate) FIGS. 5 and 6
As shown in (A) and (B), a driver substrate 13 (drive circuit substrate) for controlling liquid crystal driving 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 stored. A video board 1 on which a video signal processing circuit is mounted in parallel with the upper surface by being screwed and fixed.
1 is arranged. Both the driver board 13 and the video board 11 are arranged such that the rear end of the board reaches near the rear end face of the apparatus.
The input / output terminals of the ub connector are directly attached, and constitute a part of the input / output terminal group 50 of the rear case 5. Accordingly, the wiring distance between the input / output terminal 50 formed on the rear end face of the device, the driver board 13 and the video board 11 can be shortened, and the circuit system for processing a high-speed and weak signal is affected by noise and the like. Hard to receive.

An audio board 180 for interfacing television images and audio signals is vertically disposed between the rear end face of the light guide 100 and the rear case 5. Wiring. A metal chassis 181 is arranged 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 housing. By arranging the substrates close to each other in this manner, the wiring distance between the substrates is reduced, and the structure is configured so as to be less affected by noise. Further, 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 arranged on the lower surface of the video board 11, and a connector 11 that can be inserted and connected to the connector 114 is arranged on the upper surface of the driver board 13.
6 are arranged. Therefore, when the boards 11 and 13 are arranged, the connectors are connected to each other. As described above, in this example, since the connection between the substrates is formed without leading the lead wire or the like, the number of noise sources is small, and the generation of noise can be suppressed. Further, since the driver substrate 13 is fixed to the upper surface of the light guide 100 by screws, the OEM is performed while the driver substrate 13 is fixed to the optical unit 10.
And so on.

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

Here, as in this example, the driver substrate 13
Can be fixed to the upper surface of the light guide 100 by screwing, after the electrical adjustment is performed by the driver board 13, the driver board 13 and the optical unit 10 can be set and delivered to the customer. There is no need to make any electrical adjustments at the customer site.

On the lower surface side of the light guide 100, a remote board 140 on which a remote signal processing circuit for performing signal processing input from a mouse or the like is mounted. Here, the remote board 140 is arranged so as to be able to be inserted and removed from the rear end side of the apparatus. 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, the remote board 14
By replacing 0 from the rear end side of the apparatus, it can be easily handled.

(Optical Unit) Referring to FIGS.
The optical system incorporated in the optical unit 10 will be described. 8 to 11 are AA of FIG.
It is sectional drawing in the line, BB line, CC line, and DD line. The optical system of this example includes an illumination optical system 923, a color separation optical system 924 that separates a light beam emitted from the illumination optical system 923 into red, green, and blue color light beams R, G, and B, and a color light beam. Three liquid crystal light valves 925R, 925G, and 925B as light valves for modulating light, a prism unit 910 as a color synthesizing optical system for re-synthesizing the modulated color light, and an enlarged projection of the synthesized light on the screen. And a projection lens unit 6.

The illumination optical system 923 includes a light source lamp unit 8 (light source unit) and 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 is composed of a light source lamp 801 and a lamp housing 802 containing the same. Light source lamp 80
1 is a lamp body 805 such as a metal halide lamp,
The lamp body 80 includes a reflector 806.
5 from the integrator lens 921 along the optical axis.
Out toward the side. 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. Passage holes (808, 809) for cooling air and passage holes (not shown) formed on the back side of the reflector 806 are formed on the side surface of the lamp housing 802. In this example, the lamp housing 802 and the light source lamp 801 are formed integrally, and when replacing the lamp, they are attached and detached as they are.

The integrator lenses 921 and 922 are
It is composed of an aggregate of a plurality of rectangular lenses arranged in a matrix, and divides a light beam emitted from the 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 split by the integrator lenses 921 and 922 into light of one type of polarization component. Each of the partial luminous fluxes divided by the integrator lenses 921 and 922 and converted into one type of polarization component light by the polarization conversion element 920 is condensed by the condenser lens 930 to the light valves 925R, 925G, and 9
25B. The reflection mirror 931 is for bending the central optical axis of the light emitted from the illumination optical system at a right angle toward the front of the device.

The color separation optical system 924 includes a red-green reflecting dichroic mirror 941 and a green reflecting dichroic mirror 94.
2 and a reflection mirror 943. First, in the red-green reflection dichroic mirror 941, the illumination optical system 9
The red light beam R and the green light beam G included in the light beam emitted from the light source 23 are reflected at a right angle, and travel toward the green reflection dichroic mirror 942. The blue luminous flux B passes through this mirror 941 and is reflected at a right angle by the rear reflecting mirror 943.
It is emitted to the 0 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 reflection dichroic mirror 942 and emitted from the emission portion of the green luminous flux to the color combining optical system side. You. 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 entrance-side lens 974, an entrance-side reflection mirror 971, an exit-side reflection mirror 972, an intermediate lens 973 disposed therebetween, and a condenser lens 953 disposed in front of the liquid crystal panel 925B. It is composed of

The converging lenses 9 are provided on the exit sides of the exit portions of the color separation optical system 924 for the blue light beam B and the green light beam G, respectively.
51 and 952 are arranged. Each color light beam emitted from each emission unit is incident on these condenser lenses 951 and 952 and is collimated.

The blue and green luminous fluxes B and G thus collimated enter the liquid crystal light valves 925B and 925G and are modulated to add image information (video information) corresponding to each color light. That is, these light valves are switching-controlled by drive means (not shown) in accordance with the image information, whereby the modulation of each color light passing therethrough is performed. As such a driving means, a known means can be used as it is. On the other hand, the red light flux R is
The corresponding liquid crystal light valve 925 via the light guide system 927
Guided to R, where it is similarly modulated according to image information. The liquid crystal light valve of this example is, for example,
A device using a polysilicon TFT as a switching element can be used. In addition, 9251 in FIG. 8 and FIG.
This is a flexible printed circuit board for supplying signals to the liquid crystal light valves 925R, 925G, and 925B.

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

Next, each liquid crystal light valve 925R, G,
Each color light beam modulated through B enters the color combining optical system, where it is combined. In this example, as described above, the color combining optical system is configured using the prism unit 910 including the dichroic prism. The luminous flux synthesized here 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 source lamp 805
Emitted from the light guide 100 are reflected by the reflection mirror 931 in the light guide 100,
The light travels along an L-shaped optical path in a large round shape along the planar shape of the letter and reaches the color separation optical system 924 and the prism unit 910. Therefore, the optical path is set as long as possible while each optical component is arranged in a narrow area. Therefore, the light emitted from the light source lamp unit 8 is converted into a parallel light by using a liquid crystal light valve while using a lens having a small F-number and securing a sufficient arrangement position of the integrator lenses 921 and 922 and the polarization conversion element 920. 925R,
925G and 925B.

FIG. 13A is a perspective view of the lower light guide 901 constituting the optical unit of the present embodiment. FIG.
FIG. 15 is a perspective view of only a part of a molded product made of the magnesium alloy used for the lower light guide 901.
FIG. 7 is a perspective view of the lower light guide 901 in which only a resin portion integrally formed with a molded product made of a magnesium alloy is extracted.

As shown in FIGS. 13A, 14 and 15, the main body of the lower light guide 901 is formed of a molded product 900 made of a magnesium alloy. The lower light guide 901 includes a light source lamp unit 8, a certification optical silicon 923, a color separation optical system 924, a light guide system 927,
Spaces 800, 92 for disposing liquid crystal light valves 925R, 925G, 925B and prism unit 910.
40 and 9250 are formed, and in each space, an optical component positioning section 190 for positioning various optical elements for forming the above-described optical system (in FIG. 13A, the polarization conversion element 920 is positioned and fixed). Only the portions are denoted by reference numerals.). Further, the space 800 for disposing the light source lamp unit 8 has a molded product 90 made of a magnesium alloy on the upper surface of the light source lamp unit 8.
0 is configured to cover.

On the other hand, the optical component positioning portion 190 is formed of a structure that cannot be formed by magnesium die-casting or formed of resin because high accuracy is required. The optical part positioning section 190 includes the resin part 1
A fixed groove 198 extending in the vertical direction is formed on the opposing surfaces of the optical elements 99, and among the optical components constituting the illumination optical system, the color separation optical system, the light guide liquid crystal light valve, and the color combining optical system, a flat optical element is formed. All the optical components having a component or a flat portion (flange portion) have an optical component positioning portion 1.
It is fixed using 90 fixing grooves 198. That is, these flat optical components are inserted into the fixing groove 198 and then fixed with an adhesive or the like. The resin portion 19
It is preferable that the resin used in No. 9 has a linear expansion coefficient close to that of a magnesium alloy.
PS 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 as the resin portion 199 is formed. (In FIG. 14, only a part is denoted by a reference numeral.) 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 molded article 900 made of a magnesium alloy is formed through the resin through hole 909. And then solidify. As a result, the resin portion 199 constituting the optical component positioning portion 190 is a molded product 900 made of a magnesium alloy.
90 made of magnesium alloy
Fix to 0. Therefore, even when the resin portion 199 is attached to a part of the molded product 900 made of a magnesium alloy, the resin portion 199 does not fall off the molded product 900 made of a magnesium alloy. Of course, instead of using the outsert molding of the molded article 900 made of a magnesium alloy, a resin part 199 made of another part may be fixed to the molded article 900 made of a magnesium alloy by a method such as bonding. When the molded article 900 made of a magnesium alloy is manufactured by outsert molding as in the embodiment, there is an advantage that the production efficiency is high and the dimensional accuracy is high.

The lower light guide 901 thus configured
Since the resin part 199 is used only for a part,
Steps such as deburring (cutting for sizing) after molding are hardly necessary, and even if necessary, only a few man-hours are sufficient. 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 article made of resin.

Further, as shown in FIGS. 13A and 14, the lower light guide 901 is integrally formed with a head section 903 for fixing the combining optical system and the projection optical system. The head section 903 basically includes a vertical wall 91 extending vertically 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) having a step 198A is integrally formed with the bottom wall 92 as an optical component mounting portion of the color combining optical system. Then, each prism piece constituting the prism unit 910 is fixed in a state where it is positioned by the step 198A. Note that this resin portion 199 is also the resin portion 1 that constitutes the optical component positioning portion 190 described above.
Similarly to 99 (see FIG. 9), it is formed in an outsert format. Therefore, the resin portion 199 constituting the optical component mounting section 190 is fixed to the magnesium alloy molded product 900 via the resin through hole 909 so as to sandwich the magnesium alloy molded product 900 therebetween.

A rectangular opening 9 through which light emitted from the prism unit 910 passes is provided at the center of the vertical wall 91.
1b is formed. The vertical wall 91 has four screw holes 91d for fixing the base end side (flange portion) of the projection lens unit 6 at four places. 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 lower light guide 901 has
The head unit 903 is integrally formed in advance, and since there is no combination play or variation in tolerance between the light guide 901 and the head unit 91, the projection lens unit 6 and the prism unit 910 are sandwiched by the vertical wall 91 therebetween. The mutual positioning can be easily performed only by fixing. Therefore, the assembling work is easy, and the optical axis adjustment and the complicated positioning mechanism and adjustment mechanism do not need to be provided, so that the cost can be reduced. Moreover, since they are also excellent in their integration, there is an advantage that even if an impact force or the like acts after assembling, there is very little risk of mutual displacement.

The bottom wall 92 of the head portion 903 has three communication holes 91g for allowing cooling air to flow. As can be seen from FIG. 6A, the intake fan 15 is attached to the back surface of the bottom wall 92, and the intake fan 1
The cooling air sucked in by 5 flows into the upper side of the bottom wall 92 via these communication holes 91g.

As described above, in the present embodiment, when forming the light guide 901, a molded article made of a magnesium alloy is used instead of a molded article made of a resin or an aluminum alloy. The molded article made of the magnesium alloy has a lower specific gravity than the molded article made of the resin. For example, the specific gravity of a molded article made of resin is about 2.7, which is equivalent to that of a molded article made of an aluminum alloy, while the specific gravity of a molded article made of a magnesium alloy is about 1.8. The weight can be reduced.

The light guide 901 is about 1.5 mm
Even if the molded product 900 made of a magnesium alloy is as thin as possible, it can withstand the heat generated by the light source lamp 805, the prism unit 910 constituting the color synthesizing optical system, or the power supply unit 7, and the weight of the optical components. The shaft can be maintained with high accuracy. Therefore, the light guide 90
Since the optical unit 1 can be made thinner, the weight of the optical unit 10 can be further reduced, so that it is easy to carry and handle.

Further, the molded article 900 made of a magnesium alloy has high heat dissipation from the viewpoint of the material, and can also enhance the heat dissipation from the inside in that it can be made thin. Therefore, an internal temperature rise can be suppressed.
For example, if a polarization conversion element made of resin is weak to heat as an example, the structure of the present embodiment using a molded product 900 made of a magnesium alloy is more effective than the conventional structure using a light guide made of resin. For example, the temperature in the steady state of the polarization conversion element can be lowered by as much as 10 ° C. to 20 ° C. Therefore, a large heat-resistant margin of an optical element such as a polarization conversion element can be ensured, and the reliability is improved.
Conversely, if the lifespan is the same, a smaller optical element can be used under the same usage conditions as the conventional one, and it is possible to cope with high-luminance display while reducing the size.

Further, it can be said that the use of an optical element having the same size and the same life can improve the illuminance.

Furthermore, since the molded article 900 made of a magnesium alloy has higher shock resistance and vibration resistance than a molded article made of a resin, stable accuracy can be maintained and a failure hardly occurs. Moreover, a molded article 9 made of a magnesium alloy
00 is highly reliable because there is almost no deterioration of the material unlike a molded article made of resin. For example, when a molded product made of resin receives ultraviolet rays from the light source, a part of the resin is decomposed, and the decomposed product may adhere to the light source or the optical component and deteriorate the performance. In the case of the molded article 900 made of, there is no such performance deterioration. Furthermore, the molded article 900 made of a magnesium alloy has an advantage that it can be recycled.

Further, since the molded article 900 made of a magnesium alloy used for the light guide 901 has good conductivity by itself, the molded article 900 made of a magnesium alloy is used.
If 00 itself (light guide 901 itself) is fixed to the ground potential, it can be used as a ground bus line. Therefore, if the ground from each substrate is dropped on the molded article 900 itself (light guide 901 itself) made of a magnesium alloy, shielding can be performed as it is. Moreover, since the optical unit 10 occupies a wide area in a plane inside the outer case 2 of the projection display device 1, the optical unit 10 itself sufficiently functions as a shield material, and the substrate is placed in any place. Even if it arrange | positions, a board | substrate can be grounded directly from a board | substrate without using an earth plate, or only by using a small earth plate. Therefore, each substrate can be arranged above, below, or on the side of the optical unit 10, so that there is a high degree of freedom in the location of each substrate.

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 the side surfaces are covered with a shielding material made of a molded product 900 made of a resin 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 device 1 of the present embodiment
Then, EMI countermeasures are thorough while having a simple structure. Further, in the projection display device 1 according to the present embodiment, which is equipped with a circuit for processing a weaker video signal for higher speed,
Since strong noise radiated from the lamp body 805 can be reliably shielded by the upper light guide 902 and the lower light guide 901, the reliability can be remarkably 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 is formed integrally with the upper surface of the bottom wall 92. Component positioning section 190A
Functions as a prism fixing plate. Therefore, in the present embodiment, it is not necessary to use a separate prism fixing plate. In addition, since the lower light guide 901 is formed of the thin magnesium die-cast product 900 including the head portion 903, there is a margin in space correspondingly. Therefore, in the present embodiment, the intake fan 1
5, sufficient spaces 151 and 152 can be secured above and below. Therefore, the cooling air can be taken in smoothly, and the reduction in static pressure can be suppressed from the structural aspect, and the cooling efficiency can be increased. That is, the intake fan 1
The cooling air sucked by 5 flows in a laminar flow,
As the fluid resistance is small, the cooling air is smoothly sucked by the intake fan 15 and the prism unit 9
Smoothly supplied to 10. Therefore, the cooling efficiency is high.

A prism duct and a dust-proof mesh cover (not shown) may be arranged on the upper surface of the prism unit 910. In this way,
This prevents foreign matter that has fallen or dust from entering when the cooling air flows in the flow path of the cooling air when the power supply is turned off to a negative pressure and flows backward.

In addition to the above-described embodiments, the optical component positioning portions 190 shown in FIG. 15 are connected to each other by a runner portion (not shown) for molding to obtain positioning accuracy. The same effect can be obtained by fixing the molded product 900 made of the magnesium alloy by screwing or caulking using the resin through hole 909.

[0113] 2. Second Embodiment FIG. 16 shows a second embodiment of the present invention. In this embodiment, only the light guide of the first embodiment is constituted by a molded product made of a magnesium alloy. On the other hand, the optical component positioning section together with the light guide is formed of a molded product made of a magnesium alloy.

In this case, the magnesium powder is kneaded with the resin, and after molding, the resin portion is scattered by heat or heat and pressure, and the molding is performed in an integrated manner including the optical component positioning portion 190 by a molding method of precision molding. Is also good.

Note that this embodiment and the third
In the embodiment, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted or simplified.

In recent years, in the magnesium forming method, it has become possible to perform a forming process similar to resin forming in a solid-liquid state using thixotropy. When this processing method is adopted, there are advantages that thin wall molding is possible, dimensional accuracy is high, so that machining for dimensioning is unnecessary, and strength can be improved by increasing the molding density.

However, on the other hand, it is necessary to consider the flowability of the molten metal, a measure to prevent biting into the mold is indispensable, and a buffer structure for realizing impact resistance when optical components are directly supported and guided by a magnesium material is indispensable. There are problems such as becoming.

The following is a detailed description including such a viewpoint.

In the second embodiment, since the optical component positioning portion 190 ′ is also a molded product made of a magnesium alloy, the form of the positioning portion 190 ′ is changed from the positioning portion 190 made of resin.

That is, as shown in detail in FIGS. 16 and 17, first, a non-flat optical component, that is, a portion A-190 ′ for positioning the condenser lenses 951 to 953 and the intermediate lens 973 has a height dimension. An H main body 199 ', a guide portion 198' having a height dimension of h, and a receiving portion 195 for supporting a lower end portion of the lens 951 and the like are provided. The guide portion 198 'protrudes outward from the main body portion 199' and is formed in a groove shape sandwiching both side portions of the lens 951 and the like, and the height dimension h is set to 1/2 <H <3/4. However, preferably, 1 / H of the height dimension H of the main body portion 199 ′.
It is about 2/3. The height H of the main body is substantially the same as the diameter of the lens. Also,
The receiving portion 195 is also formed so as to sandwich both side surfaces of the lens 951 and the like, and a rib 196 for reinforcing and improving hot water flow 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 it can guide the lens 951 and the like, and since the lens 951 and the like are disk-shaped, the guide portion 198' is made smaller.
This is because the height dimension of 8 'does not necessarily have to be the same as the diameter of the lens 951 or the like, and the molding process is facilitated.

In the optical component positioning section 190 ′, a flat optical component, that is, an integrator lens 921,
922, polarization conversion element 920, reflection mirrors 941-94
The positioning portions B-190 'for 3, 971, 972 have a three-point fixing structure as shown in FIGS.

That is, the mirror 941 is formed integrally with the lower light guide 901 on the bottom surface of the lower light guide 901.
The lower light guide 901 is formed integrally with the lower light guide 901 and formed integrally with the lower light guide 901 to support the upper and both flat surfaces of the reflection mirror 941 and the like. , This upper support portion 983
Are two positioning members 98 which are arranged to be shifted in the vertical direction.
3A and 983B. In addition, receiving part 98
2. One of the two surfaces of the upper support portion 983 that abuts the reflection mirror 941 or the like is an attachment reference surface 984, and the draft of the attachment reference surface 984 is, for example, 0.
° to 0.008 °. The draft angle of the other two surfaces other than the attachment reference surface 984 is 1 to 20 °. In this manner, by providing the receiving portion 982 and the supporting portion 983 with a gradient, it is possible to prevent the die from biting due to shrinkage after molding.

As shown in FIG. 20, a mirror 941 or the like is provided between another two surfaces other than the mounting reference surface 984 of the receiving portion 982 and the upper support portion 983 and the reflection mirror 941 or the like. The cushioning member 985 made of an elastic member such as a sponge, a tape, and a resin is disposed in order to support the robot without looseness.

According to the second embodiment, the same effects as those of the first embodiment can be obtained. In addition, the shock applied to the mirrors and lenses can be buffered by the cushioning material 985. Since there is no molded product made of magnesium alloy, the specific gravity is smaller than the molded product made of resin, and it is possible to make the best use of the features that it is excellent in terms of heat dissipation and strength. is there.

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

Furthermore, since the height of the guide portion 198 'of the positioning portion such as the condenser lens 951 is smaller than the diameter of the lens 951 or the like, the guide portion 198' is formed to have a size capable of guiding.
In the forming process, the flow of hot water is small and the process is easy. The positioning portion such as the reflection mirror 941 is composed of the receiving portion 982 and the upper support portion 983, and the mounting reference surface of the receiving portion 982 and the like. Since the buffer material 985 is packed between the other two surfaces different from 984 and the reflection mirror 941 or the like, the mirror 941 or the like can be supported without play.

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

In the projection type display device 1 'of this embodiment, the outer case 2' including the lower case 4 'is formed of a molded product made of a magnesium alloy. Such an outer case 2' has a large area. Hot water (magnesium molten metal) is formed so as to be sufficiently spread to every corner. That is, as shown in FIG. 23, a concave portion 211 is provided on the opposite side of the gate 210 formed in the outer case 2 ′ and at one corner (for example, near the lamp housing portion) with the corner view interposed therebetween. The recessed portion 211 includes a waste runner 212
Is provided. And, in this concave portion 211,
After the runner 212 is removed, for example, a graining process is performed, thereby avoiding a defect on the outer surface of the outer 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 wavy shape as a whole, and nests, hot water lines, sink marks and the like are located at a position far from the gate 210. They do not stand out when they occur. Further, the gate 210 is provided in the outer case 2 ′.
, And is formed so that the plate thickness becomes thinner toward the outer side.

Although not shown, ribs for securing the flow of hot water are also provided around the opening (for example, the operation switch) of the outer case so that the hot water can sufficiently spread around the opening at the time of molding.

The optical component positioning portion 190 'for positioning the reflection mirror 941 and the like must be provided with a plurality of holes for allowing the fitting portion to escape from the lower case due to the configuration of the mold.

By forming the exterior case in addition to the light guide as a molded product made of a magnesium alloy, a shield case constituting the power supply unit 7 can be eliminated as shown in FIG. This is because the light guide and the outer case can have a shielding function. When the shield case constituting the power supply unit 7 is not provided, as shown in FIG.
Groove-shaped receiving portion 7 along the longitudinal direction of lower light guide 4 '
3, and a plurality of ribs 74 orthogonal to the groove-shaped receiving portion 73 are provided. Then, the ends of the substrates 77 are accommodated in the receiving portion 73, and a bracket 75 having an L-shaped cross section is provided.
And the screw 76. If a circuit block or the like inside the power supply unit 7 needs to be cooled by forming a specific flow path, it may be covered with a resin plate or the like. Therefore,
The product can be reduced in size and weight while sufficiently complying with EMI.

A primary filter 78 is arranged at one corner in the outer case 2 ', and a primary active filter 79 and a rectifier circuit (diode bridge) 80 are arranged at the opposite corner. I have. Further, a heat radiating plate 81 is mounted on the substrates 77, and the heat radiating plate 81 is provided.
Is provided with a drive FET for a chopper circuit and a diode 82 for preventing backflow.

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 determined by the sum of the heights of the lower light guide 901 and the upper light guide 902. When the height dimension is R and the height dimension of the lower light guide 901 is r, ＲR
<R <３R, preferably r = ２ / 3R. Therefore, when the apparatus is installed on a ceiling, a wall, or the like, it is not necessary to hold the apparatus main body by the holder and mount the hanging tool on the holder, and install the hanging tool directly on the outer case 2 ′. It is possible.

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

As described above, in order to perform molding in a short time of 25/1000 seconds, thin-wall molding has been established by setting the shape and dimensions so as not to impair the molten metal flowability. In addition, the height of a guide portion (not shown) of a portion A-190 'for positioning the condenser lenses 951 to 953 and the intermediate lens 973 is also set to a minimum necessary. The same applies to the guide portion of the positioning portion B-190 'for a flat optical component such as 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 falling down by hot water formed at high speed and high pressure, and to improve the positioning accuracy.

In the projection display 1 ′ of this embodiment, since the outer case 2 ′ is formed of a magnesium molded product,
Although the device is lightweight, it is strong and can be used, for example, suspended from the ceiling.

That is, as shown in FIG. 22, at least two or more bosses 2 formed on the back surface of the outer case 2 '.
15 is provided with a tap, while a hanger 216 is provided so as to surround the outer case 2 'from the outside. The suspenders 216 stand up from the rear surface of the outer case 2 ′ along both side surfaces, so that the projection display 1 ′ can be used, for example, by suspending it on a ceiling. That is, the hanging tool 2
After the screw 16 is screwed into the tap of the boss 215 from the outside of the case 2 'and attached, the flange 216A is pressed against the ceiling and fixed with a bolt or the like. Since the case is made of a magnesium material, it can withstand the use of hanging the main body upside down with a threaded boss.

According to the third embodiment, the same effects as those of the first and second embodiments can be obtained. In addition, since the outer case 2 'is a molded article made of a magnesium alloy. There is an effect that the weight is further reduced and the heat radiation is more excellent than that of the projection type display device of the first and second embodiments, and the strength is also excellent.
Further, since the weight is reduced, the derivative development of the product can be easily widened, for example, when the product is hung on a ceiling.

(Other Embodiments) As shown in FIG. 26, a rear projection display device 1A may be constructed using the optical unit 10 according to the first embodiment. In this case, the light emitted from the optical unit 10 is reflected by the mirrors 101A and 102A and projected on the lenticular screen 103A (projection surface).

In the first embodiment, the light guide of the molded product made of a magnesium alloy is combined with the outer case 2 made of resin. In the third embodiment, the light guide 10 ′ and the outer case 2 ′ are combined. Although the molded article made of a magnesium alloy is integrally formed, the present invention is not limited to this. For example, the light guide and the exterior may be separately formed of a molded article made of a magnesium alloy, and these may be combined.

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

In the second embodiment, the receiving portion 90
Although the cushioning material 905 is packed between the other two surfaces other than the attachment reference surface 904 such as the second and the reflection mirror 941 and the like to eliminate the backlash of the reflection mirror 941 and the like, the present invention is not limited to this. 27, the mounting reference surface 904
Alternatively, a tape or a resin material 905 may be attached to another surface by bonding or outersert.

[0144] Even in this manner, the reflection mirror 94 is used.
1 etc. can be supported without play.

[0145]

As described above, in the optical unit and the projection type display device according to the present invention, the light guide of the optical unit is made of a magnesium alloy by changing the material of the member used. Because this magnesium has a smaller specific gravity than a molded article made of resin, it can be reduced in weight, and has a high strength even though it is thin compared to a molded article made of resin. The weight of the optical unit can be reduced, and the heat dissipation and cooling efficiency can be improved. Furthermore, a molded article made of a magnesium alloy has higher shock resistance and vibration resistance than a molded article made of a resin, so that stable accuracy can be maintained and a failure hardly occurs. Moreover, since the molded article made of the magnesium alloy hardly deteriorates in material unlike the molded article made of the resin, the reliability is high and the recycling is possible. In addition, strong noise emitted from the lamp, and the adverse effect of noise between the lead wire and the circuit on the primary side of the power supply can be shielded.
The reliability of I can be improved.

In particular, when the outer case is also made of a molded product made of a magnesium alloy, the entire device can be further reduced in weight,
In addition to being able to be miniaturized, it also has a function of a heat radiating plate of the optical unit, thereby suppressing heat generation of the optical elements and improving reliability or increasing illuminance. Furthermore, since the dependence on the cooling fan can be reduced, the size and size of the fan can be reduced and the number of installations can be reduced, contributing to making the main unit smaller and thinner. Noise can also be reduced. Also,
Since the outer case is made of a molded product made of a magnesium alloy, parts having a shielding function such as a chassis for mounting and shielding the audio board and a shield plate of the power supply unit can be reduced, and the weight and cost can be reduced.

[Brief description of the drawings]

FIGS. 1A and 1B are a front view and a rear view of a projection display device to which the present invention is applied, respectively.

FIGS. 2A and 2B are a plan view and a bottom view, respectively, of a projection display device to which the present invention is applied.

FIGS. 3A and 3B are a right side view and a left side view of a projection display device to which the present invention is applied, respectively.

FIG. 4 is an explanatory diagram showing a planar arrangement structure of an optical unit configured inside the projection display device to which the present invention is applied.

FIG. 5 is a perspective view showing an optical head used in a projection display apparatus to which the present invention is applied and a substrate placed over the optical head.

FIG. 6A is a longitudinal sectional view schematically showing an arrangement structure of an optical unit, a fan, and a substrate arranged inside the projection display device to which the present invention is applied;
(B) is a projection display device to which the present invention is applied;
FIG. 3 is a vertical cross-sectional view schematically showing an optical unit disposed therein, an arrangement of substrates, and the like.

FIG. 7 is a plan view showing a state in which various optical components are mounted on the lower light guide shown in FIG.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a sectional view taken along line BB of FIG. 7;

FIG. 10 is a sectional view taken along line CC of FIG. 7;

FIG. 11 is a sectional view taken along line DD of FIG. 7;

FIG. 12 is a perspective view of a light source lamp unit used in a projection display device to which the present invention is applied.

13A is a perspective view of a lower light guide used in the optical head shown in FIG. 8, and FIG. 13B is a cross-sectional view schematically showing a fixing structure of a resin portion formed in the lower light guide. is there.

14 is a perspective view of a part of a molded product made of a magnesium alloy of the lower light guide shown in FIG.

15 is a perspective view of a resin portion of the lower light guide shown in FIG.

FIG. 16 is a perspective view showing a lower light guide according to the second embodiment of the present invention.

FIG. 17 is a side view showing a lens positioning member of the second embodiment.

FIG. 18 is a side view showing a positioning member of the reflection mirror according to the second embodiment.

FIG. 19 is a plan view showing a positioning member of the reflection mirror according to the second embodiment.

20 is a plan view showing a main part of a positioning member of the reflection mirror in FIG. 19;

FIG. 21 is a perspective view showing an outer case and a lower light guide according to a third embodiment of the present invention.

FIG. 22 is a plan view showing an outer case and a lower light guide of the third embodiment.

FIG. 23 is a schematic plan view showing a state at the time of molding of the outer case of the third embodiment.

FIG. 24 is a cross-sectional view taken along line AA of FIG. 22, showing a structure for mounting a substrate in a power supply unit in the third embodiment.

FIG. 25 is a cross-sectional view illustrating a ratio of upper and lower cases of the outer case of the third embodiment.

FIG. 26 is a configuration diagram of a rear-type image display device according to a modification of the first embodiment of the present invention.

FIG. 27 is a side view showing a modification of the positioning member of the reflection mirror according to the second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 1 'Projection display apparatus 2, 2' Outer case 6 Projection lens unit 7 Power supply unit 8 Light source lamp unit 9 Optical lens unit 10, 10 'Optical unit 100 Light guide 130 Sheet-shaped shield material 190, 190' Optical components Positioning part 199 Resin part 900 Molded product made of magnesium alloy 901, 902 Light guide 903 Head part 909 Resin through hole 910 Prism unit 920 Polarization conversion element 921, 922 Integrator lens 923 Illumination optical system 924 Color separation optical system 925R, 925G, 925B Liquid crystal light valve 931, 941-943, 971, 972 which is a flat optical component Reflector mirror 951-953 which is a flat optical component Condenser lens which is a non-flat optical component

Claims (19)

[Claims] 1. A projection for optically processing a light beam emitted from a light source unit to form an optical image corresponding to image information, and enlarging and projecting this optical image on a projection surface via a projection optical system. An optical unit for a type display device, comprising: a color separation optical system that separates a light beam emitted from the light source unit into a light beam of a plurality of colors; and a plurality of lights that modulate the separated light beams of the respective colors based on image information. A valve, a color combining optical system that combines modulated light beams of respective colors modulated through the light valve, and a projection optical system that enlarges and projects the modulated light beam combined by the color combining optical system toward a projection surface. The light source unit, the color separation optical system, the light valve, the color combining optical system, and the projection optical system are supported by a light guide using a molded product made of a magnesium alloy. Optical unit Door. 2. The optical unit according to claim 1, wherein a head unit for mounting the color synthesizing optical system and the projection optical system is integrated with the light guide. 3. The method according to claim 2, wherein:
An optical unit, comprising an optical component mounting portion having a step for positioning and fixing a prism constituting the color synthesizing optical system. 4. The light guide according to claim 1, wherein the light guide is provided with an optical component constituting the color separation optical system or an optical component positioning portion for positioning and fixing the light valve. Optical unit. 5. The optical unit according to claim 3, wherein the optical component positioning portion is constituted by a resin portion integrated with a molded product made of the magnesium alloy. 6. The optical unit according to claim 5, wherein a resin portion forming the optical component positioning portion is formed by integral molding with a molded product made of the magnesium alloy. 7. The molded product made of magnesium alloy according to claim 6, wherein a resin through hole is formed in a portion where the optical component positioning portion is formed, and a resin through hole is formed from the optical component positioning portion and the magnesium alloy. At the time of integral molding with the molded product, the resin portion constituting the optical component positioning portion is solidified by allowing the resin to flow through the resin through hole to the back side, so that the molded product made of the magnesium alloy is sandwiched between the resin and the magnesium alloy. An optical unit fixed to a molded product. 8. The method according to claim 1, wherein
The optical unit, wherein the head portion and the groove-shaped optical component positioning portion are formed of a molded product made of the magnesium alloy, and are integrated with the light guide. 9. The optical device according to claim 8, wherein the positioning portion for positioning the non-flat optical component among the groove-shaped optical component positioning portions has a guide portion for guiding a side end surface of the optical component. An optical unit, wherein a height of the portion is smaller than an outer dimension of the non-flat optical component. 10. The optical device according to claim 8, wherein the positioning portion for positioning one side surface of the flat optical component among the groove-shaped optical component positioning portions has a guide portion for guiding a side end surface of the optical component. An optical unit, wherein a height dimension of the guide portion is smaller than an outer dimension of the flat optical component. 11. The groove-shaped optical component positioning section according to claim 9, wherein the groove-shaped optical component positioning section has the guide section and the main body section, and the height dimension of the guide section is one of the height dimension of the main body section. An optical unit characterized by being in the range of / 2 to 3/4. 12. The positioning device according to claim 8, wherein the positioning portion for positioning the other side surface of the flat optical component in the groove-shaped optical component positioning portion is a lower portion supporting the optical component with both flat surfaces interposed therebetween. An optical unit characterized by having a three-point support structure of an upper support part which is alternately arranged in a vertical direction in a receiving part and two upper parts and supports each other with an opposing plane interposed therebetween. 13. A mounting reference surface for positioning the optical component according to claim 9, wherein a draft angle of the mounting reference surface is set to 0 ° to 0.008 °, and two other side surfaces other than the mounting reference surface. An optical unit, wherein a draft angle of the optical unit is 1 ° to 2 °. 14. The buffer according to claim 13, wherein the optical component is pressed against the mounting reference surface in a gap between the other two surfaces and an end of the optical component to prevent rattling of the optical component. An optical unit, wherein a member is arranged. 15. An optical unit according to claim 1, comprising 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. Characteristic projection display device. 16. An optical unit comprising: 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. The outer case and the head portion are formed using a molded product made of the same magnesium alloy as the optical unit, and
The projection display device, wherein the outer case, the head unit, and the optical unit are integrally formed. 17. An optical unit comprising: the optical unit defined in 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. The exterior case and the head portion are formed using a molded product made of the same magnesium alloy as the optical unit, and the exterior case and the optical unit are formed separately. Type display device. 18. The projection display device according to claim 15, wherein the light guide and the outer case are set at a ground potential and used as a shield material. 19. The light guide according to claim 8, wherein the height of the lower light guide among the upper and lower light guides constituting the optical unit is 1/2 to 2 times the total height of both light guides. / 3, a projection type display device.