JP3314774B2 - Projection display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system for optically processing a light beam emitted from a light source to form an optical image corresponding to image information, and a projection for enlarging and projecting the optical image formed here. The present invention relates to a projection display device including a lens. More specifically, the present invention relates to a cooling mechanism for efficiently cooling the inside of such a projection display device.

[0002]

2. Description of the Related Art A projection display apparatus basically comprises the following components. That is, a light source lamp unit, an optical unit that optically processes a light beam emitted therefrom so that a color image corresponding to video information can be synthesized, and a projection lens unit that projects the light beam synthesized here on a screen And a circuit board group on which a power supply unit, a control circuit, and the like are mounted. Except for the projection lens unit, each of these parts is arranged in an outer case of the apparatus. The projection lens unit is generally mounted so as to protrude from the front of the apparatus. An operation member such as a power switch, a light receiving window for remote control, and the like are arranged on a surface of the outer case.

In this type of projection display device, a cooling mechanism for cooling a light source lamp unit, a power supply unit, and the like, which are internal heat sources, is incorporated. Generally, after the outside air is introduced by the intake fan from the ventilation port of the outer case and the outside air flows through the internal heat source,
Air is exhausted to the outside from an exhaust port formed in the outer case by an exhaust fan.

[0004]

If the projection type display device is constructed to be small and compact so as to be easily portable, the internal space may be narrowed and the flow path of the cooling air may not be sufficiently secured. It is desirable that the power supply unit and the like be covered with a shield plate in order to prevent generation of noise. In this case, the inside of the power supply unit is a space isolated from other parts. For this reason, the cooling air does not sufficiently flow inside the power supply unit, and cooling may not be performed efficiently. Furthermore, if the outside air inlet opening of the outer case is clogged, sufficient outside air cannot be introduced into the inside of the apparatus, which causes a problem of insufficient cooling operation.

An object of the present invention is to realize a projection display apparatus having a cooling mechanism capable of efficiently cooling various parts inside the apparatus, paying attention to such points.

[0006]

A projection display apparatus according to the present invention comprises a power supply case and a plurality of power supply cases.
The number of components, a power supply system and an optical system for forming an optical image corresponding to the image information by processing a light beam emitted from a light source optically, an optical image formed by the optical system A projection lens for enlarging and projecting, an outer case for housing the optical system and the power supply system, a cooling air inlet formed in the outer case, an air outlet formed in the outer case, and the cooling A projection display device, comprising: an intake fan for taking in air from the air intake into the exterior case; and an exhaust fan for exhausting the air inside the exterior case to the outside via the air outlet. A part of the air taken into the exterior case by the intake fan passes through the optical system, directly reaches the exhaust fan, is discharged to the outside, and is discharged by the intake fan. Another part of the air taken into the interior of the exterior case cools the light source through the optical system, reaches the exhaust fan, is exhausted outside, and is exhausted by the intake fan into the interior of the exterior case. Still another part of the introduced air is passed through the optical system to the electric power.
Enter from one side of the power supply case and
Cools the plurality of components by passing
After being discharged to the outside of the power supply case, it is configured to reach the exhaust fan and be discharged to the outside of the exterior case .

Further, the projection type display device of the present invention has a power supply cable.
And a plurality of components arranged inside the power supply case.
A power supply system including a light source, an optical system that optically processes a light beam emitted from a light source to form an optical image corresponding to image information, and enlarges and projects an optical image formed by the optical system. A projection lens, an outer case for housing the optical system and the power supply system, a cooling air inlet formed in the outer case, an air outlet formed in the outer case, and the cooling air inlet. The projection display device, comprising: an intake fan for taking in air from the inlet into the exterior case; and an exhaust fan for exhausting air from the exterior case to the outside via the air outlet. The system includes a light source, a color separation optical system that separates light emitted from the light source into three color light beams, and three liquid crystal light valves that respectively modulate the three color light beams separated by the color separation optical system. A color synthesizing optical system for synthesizing light beams of three colors modulated by the three liquid crystal light valves, wherein a part of the air taken into the exterior case by the intake fan is changed to the three liquid crystal lights. After passing along the valve, directly to the exhaust fan,
Another part of the air discharged outside and taken into the exterior case by the intake fan passes along the three liquid crystal light valves, and then cools the light source, and then the exhaust fan a lead, is discharged to the outside, the intake fan portion of still another air taken inside the outer casing by, after having passed along said three liquid crystal light valves, the power source case one
From the other side, passing through the inside of the power supply case,
Cooling a plurality of components, the power case from the other side
After being discharged outside, it reaches the exhaust fan and the exterior
It is configured to be discharged to the outside of the case .

[0008]

According to the projection display device of the present invention, since the air introduced into the outer case is divided into a plurality of flow paths, the components inside the outer case are efficiently cooled. You.

[0009]

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

(Overall Configuration) FIG. 1 shows the appearance of a projection type display device of this embodiment. The projection display device 1 of the present embodiment has an outer case 2 having a rectangular parallelepiped shape. The outer case 2 basically includes an upper case 3, a lower case 4, and a front case 5 defining the front of the apparatus. A front end portion of the projection lens unit 6 protrudes from the center of the front case 5.

FIG. 2 shows the arrangement of each component in the exterior case 2 of the projection display device 1. As shown in this figure, a power supply unit 7 is disposed at the rear end side inside the outer case 2. A light source lamp unit 8 and an optical unit 9 are arranged at a position adjacent to the front side of the apparatus. Optical unit 9
The base end side of the projection lens unit 6 is located at the center of the front side. On the other hand, on one side of the optical unit 9, an interface board 11 on which an input / output interface circuit is mounted is arranged in the front-rear direction of the apparatus, and in parallel with this, a video board 12 on which a video signal processing circuit is mounted is provided. Are located. Further, on the upper side of the light source lamp unit 8 and the optical unit 9, a control board 13 for controlling device driving is provided.
Is arranged. Speakers 14R and 14L are disposed at left and right corners on the front end side of the apparatus, respectively. An intake fan 15 for cooling is arranged in the center of the back surface of the optical unit 9, and an exhaust fan 16 is arranged on the side of the device on the back surface side of the light source lamp unit 8. An auxiliary cooling fan 17 for sucking cooling airflow from the intake fan 14 into the power supply unit 7 is disposed at a position facing the ends of the substrates 11 and 12 in the power supply unit 7.

(Structure of Outer Case) As shown in FIG.
The upper case 3 of the outer case 2 has a rectangular upper wall 3a.
And left and right side walls 3b and 3c and a rear wall 3d extending substantially vertically downward from three sides excluding the front side. Similarly, the lower case 4 has a rectangular bottom wall 4.
a, right and left side walls 4b and 4c and a rear wall 4d which stand substantially vertically from three sides excluding the front side. The front case 5 has a central portion curved slightly convexly forward, and a circular opening 5b around which an annular rim 5a is formed is opened in this portion, through which a projection lens unit is formed. A front end portion 6 extends forward of the apparatus. The upper case 3 and the lower case 4 are interconnected by fixing screws 21a, 21b and 22a, 22b at two positions on the left and right side walls, respectively (see FIG. 16). The front case 5
It is held in a state of being sandwiched between the upper case 3 and the lower case 4 from above and below.

An air filter cover 23 is attached to the upper wall 3a of the upper case 3 at a position on the front side in the center. A large number of ventilation holes are formed in the cover 23, and an air filter 24 is attached inside the cover 23 so that dust or the like does not enter from outside through the air holes (FIG. 2 (b)). )reference). A large number of communication holes 25R and 25L are formed at left and right ends on the front side of the upper wall 3a at positions corresponding to the built-in speakers 14R and 14L. An operation switch lid 26 is attached to a left end portion of the upper wall 3a. The operation switch lid 26 can be opened and closed about one end as shown in FIG. 1C. When this lid 26 is opened,
A large number of operation switches 26a arranged inside are exposed (see FIG. 17B).

A lamp replacement lid 27 is mounted on the bottom wall 4a of the lower case 4 at a position corresponding to the built-in light source lamp unit 8. This replacement lid 27 is attached to the lower wall 4
a, the screw can be loosened, the lid 27 can be removed and the built-in light source lamp unit 8 can be replaced. At a position on the front side of the replacement lid 27, a ventilation hole 28 is provided.
Is formed. The ventilation hole 28 is formed at a position corresponding to the built-in cooling intake fan 15. An air filter 29 (see FIG.
(Refer to (b)) is attached to prevent dust and the like from entering the inside.

At the left and right corners of the front end of the bottom wall 4a, height adjusting feet 31 (31R, 31L) are arranged. The height of these feet 31 can be finely adjusted by turning them, and by operating the height adjustment buttons 32 (32R, 32L) protruding from the lower portions of both ends of the front case 5, these feet can be adjusted. The height of the foot 31 can be roughly adjusted (coarse adjustment). A projection 33 is formed at the center of the rear end side of the bottom wall 4a.
The apparatus 1 is set on a table or the like while being supported at three points by the two feet 31 described above. In order to prevent the device from rattling when the installation surface has irregularities,
Auxiliary projections 34R and 34L are also formed at both ends on the rear end side of the bottom wall.

On the other hand, the upper end of the right side of the front case 5 defining the front of the apparatus and the center of the rear wall 3d of the upper case 3 defining the upper half of the rear of the apparatus.
Light receiving windows 35F and 35R are arranged respectively. These light receiving windows are for receiving control light from a remote controller. As described above, in this example, since the light receiving windows are formed before and after the apparatus, remote control can be performed from either the front side or the rear side of the apparatus, which is convenient.

An AC inlet 36 for supplying external power and a main power switch 37 are arranged on the left end of the rear wall 4d defining the lower half of the rear surface of the apparatus. .

A portable handle 38 is provided on the left side of the device.
Is installed. The two base end portions 38a, 38b of the handle 38 are rotatably attached to the mating surfaces of the side walls 3b, 4b of the upper case 3 and the lower case 4. On the side wall 3b on the upper case side,
A recess 3e for storing the handle is formed, and the handle 38 can be stored here. In addition, an LED display section 39 for displaying an operation state of the apparatus is arranged at an upper end portion of the side wall 3b. An input / output terminal cover 41 that can be opened and closed about a lower end is attached to the side wall 4b on the lower case side. When this is opened, many input / output terminals 42 arranged inside are exposed (FIG. 1).
7 (a)).

Exhaust holes 43 are formed in the side walls 3c, 4c of the upper case and the lower case, which define the opposite side surface of the device, so as to extend over both of them. An exhaust fan 16 for cooling is located on the back side of the exhaust hole 43 via an air filter.

(Light Source Lamp Unit) The light source lamp unit 8 will be described with reference to FIGS. The light source lamp unit 8 includes a light source lamp 801 and a substantially rectangular parallelepiped lamp housing 8 containing the same.
02. In this example, the lamp housing 802 has a double structure of an inner housing 803 and an outer housing 804. Light source lamp 801
Is composed of a lamp body 805 such as a halogen lamp and a reflector 806, and emits light from the lamp body 805 toward the optical unit 9 along the optical axis 1a.

The outer housing 804 has an opening at the front surface in the direction of the optical axis 1a.
09 is attached. On the back surface in the direction of the optical axis 1a, a number of slit groups 807 for passing cooling air are formed. The inner housing 803 is mounted on the front surface of the light source lamp 801, and has an opening at a portion where emitted light passes, and a cooling air passage hole 80 at an outer peripheral portion.
8 are formed. In this example, the inner housing 803 and the light source lamp 801 are formed integrally. The lamp replacement is configured such that they are attached and detached while they are integrated.

(Optical unit) In the optical unit 9, an optical element other than the prism unit 910 constituting the color synthesizing means is disposed between the upper and lower light guides 901 and 902 having the shape shown in FIG. It is configured to be sandwiched and held from above and below. These upper light guides 90
1. The lower light guide 902 is fixed to the upper case 3 and the lower case 4 by fixing screws, respectively. The upper and lower light guide plates 90
Reference numerals 1 and 902 are also fixed to the prism unit 910 side by fixing screws. Prism unit 91
Numeral 0 is fixed to the back side of the thick head plate 903, which is a die-cast plate, with fixing screws. This head plate 9
A base end side of the projection lens unit 6 is similarly fixed to a front surface of the lens 03 by a fixing screw. Therefore, in this example, the head plate 903 is sandwiched between the prism units 910
And the projection lens unit 6 are integrally fixed. The head plate 9 having high rigidity as described above
The two parts are integrated with each other with the 03 interposed.
Therefore, even if an impact or the like acts on the side of the projection lens unit 6, no displacement occurs between these two members.

(Optical System) Here, an optical system incorporated in this embodiment will be described. FIG. 19 shows only the optical system of the projection display device 1 of this example. The optical system of this example is
The light source lamp 805, an illumination optical system 923 composed of integrator lenses 921 and 922, which are uniform illumination optical elements, and a light beam W emitted from the illumination optical system 923 are converted into red, green, and blue light beams R , G and B, and three liquid crystal light valves 925R and 925 serving as light valves for modulating each color light beam.
G, 925B, a prism unit 910 as a color synthesis optical system for re-synthesizing the modulated color light beam, and a projection lens unit 6 for enlarging and projecting the synthesized light beam on a screen.
Consists of In addition, it has a light guide system 927 that guides the blue light beam B among the respective color light beams separated by the color separation optical system 924 to the corresponding liquid crystal valve 925B.

As the light source lamp 805, a halogen lamp, a metal halide lamp, a xenon lamp, or the like can be used. The uniform illumination optical system 923 includes the reflection mirror 9.
A central optical axis 1a of the light emitted from the illumination optical system is bent at a right angle toward the front of the apparatus. With the mirror 931 interposed therebetween, the integrator lenses 921 and 922 are arranged to be orthogonal to the front and rear.

The color separation optical system 924 includes a blue-green reflecting dichroic mirror 941 and a green reflecting dichroic mirror 94.
2 and a reflection mirror 943. First, the light beam W is reflected by the blue-green reflecting dichroic mirror 941 at right angles to the blue light beam B and the green light beam G contained therein, and travels toward the green reflecting dichroic mirror 942. The red light flux R passes through the mirror 942, is reflected at a right angle by the rear reflection mirror 943, and is emitted from the emission part 944 of the red light flux toward the prism unit 910. With respect to the blue and green light beams B and G reflected by the mirror 941, only the green light beam G is reflected at a right angle by the green reflection dichroic mirror 942, and is emitted from the emission portion 945 of the green light beam to the color combining optical system side. You. The blue light flux B that has passed through the mirror 942 is emitted from the emission part 946 of the blue light flux toward the light guide system. In the present example, the distances from the light emitting portion of the uniform illumination optical element to the light emitting portions 944, 945, and 946 of the color light beams in the color separation optical system 924 are all set to be equal.

The emission part 9 of each color light beam of the color separation optical system 924
Condensing lenses 951, 952, and 953 are disposed on the output sides of the light-emitting elements 44, 945, and 946, respectively. Therefore, each color light beam emitted from each emission unit is incident on these condenser lenses 951, 952, 953 and is collimated.

The color light beams R, G,
Of B, red and green luminous fluxes R and G are incident on liquid crystal light valves 925R and 925G and modulated, and video information corresponding to each color light is added. That is, these light valves are switching-controlled by driving means (not shown) in accordance with the video information, and thereby each color light passing therethrough is modulated. Known means can be used as such as the driving means. On the other hand, the blue luminous flux B is guided to the corresponding liquid crystal light valve 925B via the light guide system 927, where it is similarly modulated according to the video information. As the light valve of this embodiment, for example, a light valve using a polysilicon TFT as a switching element can be used.

The light guide system 927 includes an incident side reflection mirror 971.
, An exit-side reflection mirror 972, an intermediate lens 973 disposed therebetween, and a condenser lens 973 disposed on the near side of the liquid crystal panel 925B. The light path length of each color light beam, that is, the distance from the light source lamp 805 to each liquid crystal panel is the longest for the green light beam B, and therefore, the light amount loss of this light beam is the largest. However, the light guide system 92
By interposing 7, the light amount loss can be suppressed. Therefore, the optical path length of each color light beam can be made substantially equivalent.

Next, each color light beam modulated through each of the liquid crystal panels 925R, 925G and 925B enters a color synthesizing optical system 910 where it is recombined. In this example, as described above, the color combining optical system is configured using the prism unit 910 including the diclick prism. The color image recombined here is enlarged and projected on a screen at a predetermined position via the projection lens unit 6.

Here, in the optical system of the present embodiment, in addition to the above-described configuration, it is preferable that a half-wave plate is disposed in the path of the light beam of each color so that the light beam of each color is aligned with S-polarized light.
When only S-polarized light can be used in this way, the color separation of the dichroic mirror is improved as compared with the case where random polarized light in which P-polarized light and S-polarized light are mixed is used as it is. Further, the light guide system 927 reflects a light beam using a mirror. However, since the S-polarized light has a higher reflectivity than the P-polarized light, there is an advantage that a light amount loss or the like can be suppressed.

(Prism Unit 910) Next, the prism unit 910 is formed by bonding four triangular prisms having the same refractive index to form a prism having a square cross section. A dielectric film is formed to provide desired optical characteristics.

If these four prisms are not bonded accurately, the images of the respective colors synthesized via the obtained prism unit 910 will not be aligned on the screen, and the image quality will be degraded. For example, as shown in FIG. 20, if the bonding surface has a step, such a problem occurs. As shown in FIG. 21, four prisms 910a, 910a, 9
10b, 910c, and 910d, a pair of prisms 910a, 910b are first attached with a step, and the other pair of prisms 910c, 910d are similarly attached with a step, and thereafter, these steps are attached. The surfaces 910e and 910f are used as alignment surfaces, and each pair of prisms is bonded.

However, in this method, although alignment can be performed in one direction, alignment in a direction orthogonal to this direction cannot be performed. Thus, the prism unit 910 of this example is configured to accurately bond four prisms as follows. As shown in FIG. 22, the prism 910c is set to be the longest, the prisms 910b and 910d are set to be the shortest, and the remaining prisms 910a are set to an intermediate length.
The longest prism 910c and the shortest prism 910
and d are stuck together in a state where there is a step up and down. Similarly, the intermediate length prism 910a and the shortest prism 910b are stuck together in a state where there is a vertical step. Thereafter, the pairs of prisms are bonded together such that the longest prism 910c and the intermediate-length prism 910a have a step on the upper end side.

In the prism unit 910 obtained by bonding as described above, in addition to the conventional positioning surfaces 910e and 910f as positioning surfaces, positioning surfaces 910g and 910i parallel to the lower end are also provided. Is formed. Further, a positioning surface 910j orthogonal to these positioning surfaces is formed on the upper end side. Therefore, it is possible to apply the jig to these surfaces and accurately bond the four prisms.

Also, the prism unit 910 of this embodiment bonded as described above has orthogonal alignment surfaces 910f and 910f formed at the upper end of the prism 910c.
By using j, the optical unit 9 is mounted at a predetermined mounting position as described below so that the optical unit 9 can be accurately positioned.

That is, in this embodiment, the prism fixing plate 91
1 is made of a resin having the shape shown in FIG. On the surface of the fixing plate 911, the prism 91
A mounting groove 911a of a right-angled isosceles triangle having a depth that the surface 910j at the upper end of 0c just fits is formed. The upper end surface 910k of the prism 910c is bonded and fixed to the bottom surface 911b of the groove. A pair of orthogonal sides 9 of the groove
By pressing the alignment surfaces 910j and 910f of the prism 910c against 11c and 911d, respectively.
Since the center of the prism unit 910 is accurately positioned, the prism unit 910 is mounted at an accurate position.

In this embodiment, the prism fixing plate 911 is fixed to the bottom wall 92 of the head plate 903 by a plurality of fixing screws, and the prism unit 910 is mounted on the upper surface.

(Mechanism for Preventing Light Stroke, etc.) Next, in the prism unit 910 of this embodiment, the light valve 9
Although the red light beam passes through the prism surface where the modulated light beam that has passed through 25R is incident, it is preferable to attach a glass filter 912 that absorbs and blocks the blue light beam. That is, as shown in FIG. 24, the glass filter 912 is provided on the entrance surface 910R of the prism unit 910 for the red modulated light beam.
Is pasted. The modulated light flux of each color that has passed through each light valve 925R, 925G, B passes through the prism unit 910, is reflected by the X-shaped reflection surface, and is emitted to the projection lens unit 6 side. However, a small amount of light of each color passes through the reflection surface without being reflected by the reflection surface, and reaches the liquid crystal light valve that faces the prism unit 910. For example, a blue modulated light beam may pass through the blue reflective surface and enter the red light valve 925R from behind. Conversely, the red modulated light beam may pass through the red reflective surface and enter the blue light valve 925B from the back surface. Further, the green modulated light beam may not be passed through the prism unit 910 and may be reflected toward the red light valve 925R. When light enters the liquid crystal light valve from the back side in this manner, there is a possibility that adverse effects such as malfunction of the liquid crystal panel may occur. In particular, the influence of blue light, which is light on the short wavelength side, is particularly large. Therefore, as described above, if a glass filter 912 is attached to the incident surface 910R of the red modulated light beam in the prism unit 910 to prevent the blue light beam from entering the liquid crystal light valve 925R from the back side, such a case can be obtained. The evil can be avoided.

Note that, in addition to the above-described filter 912, a filter for absorbing the red light beam may be attached to the side of the incident surface of the blue modulated light beam.

(Power Supply Unit) The power supply unit 7 is shown in FIG.
As shown in (1), each constituent element is built in a metal shield case 701, and electric and magnetic noise generated in this part is prevented from leaking outside. The shield case 701 has a size extending over the left and right side walls of the outer case 2 of the apparatus, and a left end portion has a flat shape protruding toward the front of the apparatus with a constant width. That is, in front of the protruding portion 702, the reflection mirror 931 of the uniform illumination system of the optical system block 9 is positioned at 45
It is arranged at an angle of degrees. The space on the back side tends to be a dead space. In this example, this space 703
In order to make effective use of the power supply unit, the shield case 701 is protruded toward the space 703 to form a protruding portion 702 to secure a space for arranging components of the power supply unit.

The shield case 701 of the power supply unit 7
Has a rectangular hollow cross section, and its rigidity is generally higher than other parts. The bottom side of the case 701 is fixed to the bottom 4a of the lower case 4 by a plurality of fixing screws. The upper surface is fixed to the upper wall 3a of the upper case 3 by a plurality of fixing screws. As described above, in this example, on the rear end side of the apparatus, the upper case 3 and the lower case 4 are fixed to the highly rigid shield case 701, so that the outer case at the rear end of the apparatus has high integrity. Also, the rigidity is high.

Here, the power supply unit 7 is heavier than other components arranged in the apparatus. Heavy parts in the apparatus together with the power supply unit 7
Prism unit 91 fixed before and after head plate 903
0 and the projection lens unit 6. In this example, FIG.
As can be clearly understood from the figure, the power supply unit 7 is arranged in a horizontally long state at the rear end of the apparatus. The power supply unit 7
By appropriately setting the arrangement of the components, the center of gravity is adjusted so as to be located at the center in the width direction of the device. On the other hand, on the front end side of the apparatus, the prism unit 910 and the projection lens unit 6 are arranged at the center. Therefore, in this example, the position of the center of gravity of the device is substantially located at the center in the width direction and the front-back direction of the device. As a result, even if the portable handle 38 is pulled out and the device is accidentally dropped while the device is being carried with the left side of the device facing upward as shown in FIG. Because it is located in the center of the left and right, it will fall in that posture. If the position of the center of gravity of the device is shifted to the front or rear or left and right, the device falls while falling to the side of the center of gravity. When the device falls, the corner portion of the outer case of the device collides with a floor surface or the like first, so that an excessive impact force acts on a local portion, and the portion is extremely likely to be damaged. However, in this example, since the device falls as it is without falling back and forth, left and right, the lower right side of the device collides with the floor surface almost at the same time as a whole, and there is a very low possibility that local damage will occur. There are advantages.

Further, conventionally, the power supply unit 7 has only the bottom or top side fixed to the outer case 2 side. However, in this example, FIG.
As can be seen from FIG.
04 is fixed to the outer case 2 side. In this example, the lower case 4 is fixed to the rear wall 4d. As a result, when vibration in the front-rear direction is applied to the device, the back-and-forth vibration of the power supply unit 7 is effectively prevented.

On the other hand, in the power supply unit 7 according to the present embodiment, the power supply path from the power supply unit to each drive section is made as short as possible, so that the lead wire as a noise source is made as short as possible. Is to be suppressed. First, the AC inlet 36 and the main power switch 3
Reference numeral 7 is directly fixed to the rear side surface of the shield case 701 of the power supply unit 7. Therefore, it is possible to omit the lead wires routed from each of these parts to the power supply unit 7.

Further, an interlock switch 710 that is linked to the opening and closing of the lamp replacement lid 27 attached to the back of the apparatus is also integrally attached to the front side of the shield case 701 of the power supply unit 7. That is, as shown in FIG. 2, the interlock switch 710 is attached to a portion of the shield case projecting portion 702 slightly away from the right side of the device. The operating portion 711 of the switch 710 faces downward, and is constantly pushed upward by an operating projection 271 extending vertically from the upper surface of the replacement lid 27. In this state, the interlock switch 710 is on. On the other hand, when the replacement lid 27 is removed, the operating portion of the switch 710 moves downward, and the switch is turned off. As described above, the switch 710 which has conventionally been located away from the power supply unit 7 is fixed to the side surface of the shield case 701 of the power supply unit, and the lead wire to that point is shortened.

Further, in the power supply unit 7 of this embodiment, a ballast circuit portion 720 which is a driving circuit of the lamp unit 8 which is arranged adjacent to the front side of the apparatus is arranged on the same side as the lamp unit 8. The lead wire from here to the lamp unit 8 is made as short as possible.

As described above, in this embodiment, since the power supply path extending from the power supply unit 7 to each drive portion is made as short as possible, the number of noise sources is reduced as compared with the related art, and noise generation is reduced. Can be suppressed.

(Arrangement of Substrates) FIGS. 11, 12 and 1
3, the interface board 11 and the video board 1
2 and the arrangement of the control board 13 will be described. First,
As shown in FIG. 16, the control board 13 is arranged below the upper wall 3 a of the upper case 3 in parallel with the upper case 3, and is fixed to the upper case 3 side by fixing screws at a plurality of positions on the outer peripheral edge. ing. The substrate 13 has a shape that covers the upper surfaces of the optical system block 9 and the light source lamp unit 8. Further, a portion immediately above the prism unit 910 has a shape cut into a rectangle. This substrate 1
At the left end of the device 3, contacts corresponding to the operation switch group 26a arranged at the left end of the upper surface of the device are arranged.

As can be seen from FIG. 13, the interface board 11 is arranged in parallel at a position slightly higher than the bottom wall 4a of the lower case 4. Also, the video board 12 is arranged in parallel with the side wall on the left side of the apparatus, with the video board 12 standing upright in the vertical direction from the front side of the interface board 11. These two substrates 11 and 12 are supported by a substrate fixture 111 fixed to the bottom wall 4 a of the lower case 4. Further, a shield plate 112 is attached to the upper end of the board fixing bracket 111, and the upper end side of the shield plate 112 extends to the upper end of the video board 12. Therefore, these two substrates 11, 1
2. A shield space is defined between the shield plate 112 and the substrate fixing bracket 111 therebetween.
Therefore, it is possible to prevent the noise generated from the electric element and the electronic element disposed therebetween from leaking to the outside.

The electrical connection between the substrates is as follows. First, on the surface of the interface board 11, a connector 113 with the video board 12 is arranged. A connector 114 that can be inserted and connected to the connector 113 is disposed on the lower surface of the video board 12. Similarly, a connector 115 for the control board 13 is disposed on the upper surface of the video board 12. A connector 116 that can be inserted and connected to the connector 115 is arranged on the back surface of the control board 13. Therefore, as shown in FIG.
In a state where 3 is arranged, the corresponding connectors are connected to each other.

As described above, in the present embodiment, the connection between the substrates is formed without leading the lead wires or the like. Therefore, the number of noise sources is small, and generation of noise can be suppressed.

Further, in this example, as can be seen from FIG. 11, the corner portion of the outer peripheral edge of the control board 13 is fixed to the outer case 2 side, that is, the ground side, using fixing screws. Such corner portions are portions where noise is likely to occur. However, by grounding such a portion as in this example, it is possible to suppress the generation of noise.

(Structure of Head Plate Part) The shape of the head plate 903 will be described mainly with reference to FIGS. The head plate 903 basically includes a vertical wall 91 extending vertically in the width direction of the apparatus and a bottom wall 92 extending horizontally from a lower end of the vertical wall 91. Vertical wall 91
As shown in FIG. 8, is a wall having a large number of reinforcing ribs 91a formed on the surface thereof in the vertical and horizontal directions and having a high out-of-plane rigidity, and a central portion thereof has a rectangular shape through which light emitted from the prism unit 910 passes. Opening 91b is formed. The vertical wall 91 has a screw hole 91c for a prism unit fixing screw, and the projection lens unit 6
Is formed with a screw hole 91d for fixing the base end side. As can be seen from FIG. 4, the base end of the projection lens unit 6 is fixed to the front surface of the vertical wall 91, and the prism unit 910 is fixed to the rear surface.

As described above, since the prism unit 910 and the projection lens unit 6 are fixed in a state where the vertical wall 91 having high rigidity is sandwiched and aligned, the integration thereof is high, and an impact force or the like acts. However, there is an advantage that mutual displacement is extremely unlikely to occur.

The cooling fan 15 is mounted on the back surface of the bottom wall 92 of the head plate 903. On this bottom wall 92,
A communication hole (not shown) for flowing cooling air is formed.

Here, as can be seen from FIGS. 2B and 4A, the upper and lower ends of the vertical wall 91 of the head plate 903 are attached to the upper case 3 and the lower case 4, respectively. , 91f are formed. These parts are fixed to the upper case 3 and the lower case 4 by fixing screws.

As described above, in this example, as described above, the upper case 3 and the lower case 4 have the rear end portion fixed to the power supply unit 7 and the front end portion fixed to the head plate 903. ing. As described above, since the upper case 3 and the lower case 4 are fixed to the portions having high rigidity, the integrity and rigidity of the upper case 3 and the lower case 4 are increased. Therefore, the impact resistance is improved, and the occurrence of damage due to dropping or the like is reduced.

(Cooling Mechanism) Next, with reference to FIGS. 7, 8, 9 and 10, a description will be given of a cooling mechanism for each heat-generating portion in the projection display device 1 of the present embodiment.

The basic flow of the cooling air in the apparatus 1 of this embodiment is a path as shown in FIG.
The air sucked from the outside by the cooling suction fan 15 through the ventilation hole 28 formed in the bottom wall 4a of the device 1 passes through the inside of the optical unit 9 and is an exhaust fan arranged on the right side of the device. 16 again discharges to the outside. As shown by the bold line in FIG. 8, the main air flow passage is partially air flow 1100 passing through the optical unit 9 in a plan view and linearly moving through the exhaust fan 1.
It passes through here and is discharged to the outside.

Another air flow 1120 flows from the optical unit 9 to the vent hole 804 a formed in the outer housing 804 and the vent hole 80 formed in the inner housing 803 from the front side of the light source lamp unit 8.
Via 8 it gets inside. After passing through this, it passes through the exhaust port 807 on the back side, and is discharged outside through the exhaust fan 16 on the back side.

On the other hand, another airflow 1130 is sucked through the optical unit 9 by the auxiliary suction fan 17 attached to the end of the power supply unit 7 and drawn into the power supply unit 7. After passing through the inside, it is sucked by the exhaust fan 16 from the other end side and discharged to the outside.

FIG. 9 shows a three-dimensional flow of an air flow 1130 passing through the inside of the power supply unit 7. As shown in this figure, after the airflow 1130 is sucked from the outside by the suction fan 15, the airflow 1130 is blown upward along the surfaces of the light valves 925R, G, and B of the optical unit 9 on the entrance side and the exit side. , Through the air hole formed in the upper light guide 901, enters between the upper surface and the rear surface of the upper wall 3 a of the upper case, and flows laterally between them. Next, the upper light guide 9
01, lowers the portion of the optical unit 9 where the integrator lenses 921 and 922, which are uniform illumination optical elements, are disposed, and passes through the lower light guide 90.
The air flows around the lower side from the vent hole opened in 2, and then is introduced into the power supply unit 7 via the suction fan 17. Thereafter, the air flows toward the exhaust fan 16 and is discharged to the outside through the exhaust fan 16.

As described above, in this embodiment, the auxiliary exhaust fan 17 is arranged to forcibly introduce the cooling airflow into the power supply unit 7. Therefore, the inside of the power supply unit which is a heat source can be effectively cooled.

FIG. 7 shows a three-dimensional flow of the air flow 1120 flowing through the light source lamp unit 8.
As shown in this figure, the airflow 1120 flows between the upper light guide 901 and the back surface of the upper case upper wall 3a, and reaches the upper front end of the light source lamp unit 8 on the emission side. From here, it flows along the surface of each component of the light source lamp unit 8 and reaches the rear exhaust fan 16. That is, the airflow 1120 flows along the inner and outer surfaces of the outer housing 804 and also flows along the inner and outer surfaces of the inner housing 803. Further, it flows along the surface of the reflector 806.

As described above, in this example, the air flow 1 from the front end of the light source lamp unit 8 to the rear thereof along the optical axis.
120 are formed, a lamp 805, a reflector 806
Is efficiently cooled around the heat source.

Next, in this example, as can be seen from FIGS. 9 and 10, the vent hole 24 is also provided on the upper case upper wall 3a side.
Is formed. Therefore, for example, the intake fan 1
When clogging occurs in the filter 29 attached to the ventilation hole 28 of No. 5 and it becomes impossible to introduce sufficient outside air through this, the outside air is introduced from the upper ventilation hole 24 as follows. . As shown in FIG. 10, when the lower air hole 28 is clogged, the inside is in a negative pressure state.
4, the outside air is introduced, and an air flow as shown by a thick line 1140 is generated. This air flow 1140 is introduced from the ventilation hole 24, is sucked by the lower intake fan 15, and is blown up again through this. Part of the circulating flow circulates through the intake fan 15 (of course, such a circulating flow occurs even in a normal case in which the lower vent hole 28 is not clogged). Other airflows flow through the respective portions as the airflows 1110, 1120, and 1130 as described above, and are discharged from the exhaust fan 16 to the outside.

Here, the sealing plate 1 is provided around the intake fan 15 so that the outside air can be effectively introduced from the upper air hole 24 when the lower air hole 28 is clogged.
150 is attached. The sealing plate 1150 has a ventilation opening at a portion corresponding to the ventilation hole 24, and the periphery thereof is in close contact with the lower light guide 902 and the back surface of the bottom wall 92 of the head plate. Therefore, a circulating flow as shown in FIG. 10 is efficiently formed. That is, the upper communication hole 2
4, the introduction of outside air is effectively performed.

As described above, in this embodiment, since the communication hole 24 is provided, even if the communication hole 28 for introducing outside air on the side of the intake fan 15 is clogged, the inside of the apparatus can be cooled without any trouble. . In addition, since the sealing plate 1150 is attached, in such a clogged state, outside air can be efficiently introduced from the ventilation holes 24 apart from the intake fan 15.

(Positioning Mechanism of Light Valve) Next, referring to FIGS. 4 and 5, the liquid crystal light valve 925 of this embodiment will be described.
The R, G, and B positioning mechanisms will be described. These three
Since the positioning mechanism of one light valve is the same, the positioning mechanism of one light valve 925R will be described.

The light valve block 1200 to which the light valve 925R is attached is attached to the bottom wall 9 of the head plate 903.
2 is fixed to the upper surface. The light valve block 1200 includes a lower adjustment plate 12 attached to the bottom wall 92.
It has ten. The lower adjustment plate 1210 is formed with a pair of left and right long holes 1211 and 1212, which are long in the optical path direction.
The bottom wall 9 of the head plate is fixed by fixing screws 1213 and 1214.
It is fixed at 2.

A focus adjustment plate 1220 is mounted on the upper surface of the lower adjustment plate 1210 so as to be perpendicular to the optical path. The focus adjustment plate 1220 is attached to the vertical wall 1
221, a bottom wall 1222 extending horizontally from the lower end to the optical path upstream, and an upper wall 1223 extending horizontally from the upper end of the vertical wall 1221 to the optical path downstream. A dowel 1224 is formed at the center of the bottom wall 1222, and this is
10 rotatably supported. Therefore, the focus adjustment plate 1220 can turn left and right about a vertical line passing through the dowel 1224. The bottom wall 1222 is fixed to the lower adjustment plate 1210 by a pair of fixing screws 1225. On the other hand, the upper wall 1 of the focus plate 1220
223 is fixed to a cover 910 a that covers the upper surface of the prism unit 910 by a fixing screw 1226. The screw hole 1227 of the screw 1226 is
Therefore, if the screw 1226 is loosened, the position of the focus adjustment plate 1220 can be slightly moved forward, backward, left, and right. A notch 12 is provided at the tip of the upper wall 1223.
28 are formed. Prism unit cover 910
On the side a, a notch 910b is also formed at a position facing the notch 1228 at a predetermined interval. When the focus plate 1220 is mounted, an insertion groove 1229 into which a blade such as a flathead screwdriver can be inserted is formed between these notches. With the fixing screw 1226 etc. slightly loosened,
Insert the blade edge of a screwdriver etc. into 229 and rotate,
The focus adjustment plate 1220 includes a prism unit 910
In response to this, while turning around the dowel 1224 around the perpendicular, it also moves in the optical path direction (front-back direction).

As described above, the vertical adjustment plate 1230 is supported in parallel with the vertical wall 1221 of the focus plate 1220 movable back and forth along the optical path direction.
That is, vertical adjustment plate support portions are formed above and below the vertical wall 1221, and the vertical adjustment plate 1230 is sandwiched between them. The lower end of the vertical adjustment plate 1230 is supported by the lower end of the focus plate 1220 via an eye spring 1231, and the upper end is a pair of left and right alignment adjustment screws 1232 and 123 attached to the focus plate 1220.
3 pushed downwards. Therefore, by adjusting the screwing amount of the pair of adjustment screws 1232 and 1233, the vertical adjustment plate 1230 is
It can be moved up and down relatively to zero.

A horizontal adjustment plate 1240 is supported by the vertical adjustment plate 1230 in a state parallel thereto. This horizontal adjustment plate 1240 is pushed by one of the left and right sides by an alignment adjustment spring 1241, and the other side is pushed by one alignment adjustment screw 1242. Therefore, by adjusting the screwing amount of the screw 1242, the horizontal adjustment plate 1240 can be relatively moved in the horizontal direction with respect to the vertical adjustment plate 1230. A light valve unit 1250 to which a liquid crystal light valve 925R is attached is fixed to a central portion of the horizontal adjustment plate 1240.

The light valve block 1200 having this configuration
After fixing this to the head plate bottom wall 92, while adjusting the lower adjustment plate 1210 back and forth along the optical path direction,
By turning the focus plate 1220 around a vertical line about the dowel 1224, the focus position of the light bubble 925R, that is, positioning in the optical path direction can be easily performed. In addition, by moving the vertical adjustment plate 1230 and the horizontal adjustment plate 1240 up and down and left and right, alignment of the light bubble 925R can be adjusted.

Here, the write bubble block 12 of this example is
00, three plates, a focus adjustment plate 1220, a vertical adjustment plate 1230, and a horizontal adjustment plate
Numerals 40 are fixed by U-shaped adjustment plate fixing springs 1260 at a total of three positions, that is, a substantially central portion on the left and right and a central portion on the upper end. As before, these three plates are
Unlike the case of fixing with a fixing screw, when performing focusing or the like, there is no need to perform an operation such as loosening the fixing screw, and there is an advantage that the adjustment can be performed with the fixing spring 1260 attached. Further, if the three screws are fixed by tightening the fixing screws after positioning as in the related art, there is a possibility that the three plates whose bending angles have been adjusted may be displaced by the tightening operation. Since no complicated operation is required, there is no possibility that the three plates are displaced after the adjustment. However, in order to completely integrate the three plates after the positioning, in this example, at the upper end portions of the three plates,
An adhesive reservoir 1270 is formed. This adhesive reservoir 127
At 0, after the alignment of the three plates is completed, an adhesive is poured and these are bonded and fixed.

(Structure of Height Adjusting Foot) FIGS. 14 and 15
Shows height adjusting feet 31R and 31L, respectively. Since these two feet have the same shape and the same height adjustment mechanism, one foot 31L
Will be described. The foot 31L has a disc-shaped foot body 311 exposed from the lower end of the front case 5 of the apparatus, and a shaft 31 extending coaxially from the upper end.
Two. The shaft 312 is supported in a vertically movable manner by a foot adjuster plate 313 fixed and supported by the lower case 4, and a male screw 317 is formed on the outer periphery thereof over substantially the entire length.

A plate-shaped foot stopper 314 is integrally formed on the back side of the foot stopper button 32L exposed forward from the lower end of the front case 5. The foot stopper 314 has a penetrating portion 315 through which the shaft 312 penetrates. Further, the foot stopper 314 is always pushed toward the front side of the apparatus by the foot stopper spring 316. Therefore, the button 32L on the front side of the foot stopper 314 is always held so as to protrude forward from the front case 5. In this state, the foot stopper 314
A portion of the inner peripheral surface of the through portion 315 contacts the outer peripheral surface of the shaft 312 with a predetermined pressure. A female screw 31 that can be screwed into the male screw 317 of the shaft is provided on the inner peripheral surface of the through portion.
8 are formed.

The vertical movement of the height adjusting foot 31L of this configuration is prohibited by the spring 316. However, when the button 32L is pushed in against the spring force, the foot stopper 314 comes off the shaft 312. As a result, the foot 31L can freely move up and down along the foot adjuster plate 313. Therefore, by lifting the device 1 with both hands and pressing the left and right buttons 32L, R,
Since the feet 31L and 31R fall under their own weight, the feet can be pulled out by a predetermined length. After this,
If the buttons 32L and 32R are released with the foot pulled out by the target length, the foot is fixed at that position.

Thereafter, when the foot itself is turned, the shaft 312 is turned by the screw 318 on the stopper 314 side.
Move slightly up and down along. Therefore, button 32
The length of the feet 31L, R roughly adjusted by pressing L, R can be finely adjusted by rotating the feet themselves. Thus, in this example, the height adjustment of the front end side of the device 1 can be performed by a simple operation in a short time, and the device 1 can be set to a desired inclination angle.

(Handle mounting structure) Referring to FIG. 17, the mounting structure of the handle 38 will be described. Handle 3
8 is a handle recess 3 formed on the side surface of the device 1.
e. The handle 38 can be pivoted about the pair of lower end portions 38a, 38b and pulled out sideways. In this example, the bearing portion of the rotating shaft 381 of the handle is formed by combining the side wall 3b of the upper case and the side wall 4b of the lower case. Also, the lower end portions 38a, 38 of the handle
A slightly protruding protruding surface 383 is formed on the peripheral surface of b. By the protruding surface 383, the handle 38 is fixed to a storage position indicated by a solid line in FIG. 17A and a drawn position indicated by an imaginary line with a predetermined restraining force.

[0081]

As described above, according to the projection display device of the present invention, since the air introduced into the outer case is divided into a plurality of flow paths, the efficiency is improved. The components inside the outer case are well cooled.

[Brief description of the drawings]

FIG. 1 is a diagram showing an external shape of a projection display device according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing the arrangement of each component inside the apparatus of FIG. 1, wherein FIG. 2A is a diagram showing its planar arrangement, and FIG. 2B is a diagram showing its three-dimensional arrangement.

FIGS. 3A and 3B are diagrams illustrating a part of an optical unit and a projection lens unit, which are extracted and shown. FIG.
(B) is a schematic sectional configuration diagram thereof.

4A and 4B are diagrams illustrating a head plate, a prism unit, and a projection lens unit, which are taken out and shown. FIG. 4A is a schematic plan view, and FIG. 4B is a schematic cross-sectional view.

5A and 5B are views showing a light valve block, and FIG.
Is a plan view, (b) is a front view, and (c) is a side view.

FIG. 6 is a schematic front view showing the shape of a head plate.

FIG. 7 is a schematic sectional configuration diagram showing a configuration of a light source lamp unit.

FIG. 8 is an explanatory diagram showing a planar flow of a cooling air flow.

FIG. 9 is an explanatory diagram showing a three-dimensional flow of a cooling air flow.

FIG. 10 is an explanatory diagram showing a three-dimensional flow of a cooling air flow.

FIG. 11 is an explanatory diagram showing an arrangement of substrates.

FIG. 12 is an explanatory diagram showing an arrangement of substrates.

FIG. 13 is an explanatory diagram showing an arrangement of substrates.

FIG. 14 is a partial sectional view showing a structure of a height adjusting foot.

FIG. 15 is a partial sectional view showing a structure of a height adjusting foot.

FIG. 16 is a partial cross-sectional view showing a fixing structure of an upper case and a lower case.

FIG. 17 is a partial cross-sectional view showing a structure of a handle attachment portion.

FIG. 18 is an explanatory diagram showing the position of the center of gravity of the apparatus of FIG. 1;

FIG. 19 is a schematic configuration diagram of an optical system incorporated in the apparatus of FIG.

FIG. 20 is an explanatory diagram illustrating an example of a displacement of a prism unit.

FIG. 21 is an explanatory diagram for describing a conventional prism unit bonding method.

FIG. 22 is an explanatory diagram for explaining a method of bonding the prism units of the present example.

FIG. 23 is an explanatory diagram showing a shape of a prism unit fixing plate.

FIG. 24 is an explanatory view showing a preferred example of a prism unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Projection display apparatus 1a Optical axis 2 Outer case 3 Upper case 4 Lower case 6 Projection lens unit 7 Power supply unit 7a Vent hole 704 Power supply unit fixing screw 8 Light source lamp unit 802 Lamp case 804a, 808 Vent hole 807 Vent 9 Optical Unit 903 Head plate 910 Prism unit (color synthesizing means) 924 Color separation means 925R, 925G, 925B Light valve 15 Intake fan 16 Exhaust fan 17 Auxiliary intake fan 24 Vent (air exhaust) 28 Vent (cooling air intake) ) 43 Exhaust port 1100, 1120, 1130, 1140 Air flow 1150 Sealing plate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI H04N 9/31 H04N 9/31 E (72) Inventor Akinaga Koide 3-5-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Corporation In-company (72) Inventor Toshiaki Hashizume 3-3-5 Yamato, Suwa-shi, Nagano Seiko Epson Corporation (56) References JP-A-8-22074 (JP, A) JP-A-1-30287 (JP) JP-A-4-271334 (JP, A) JP-A-6-281907 (JP, A) JP-A-8-68978 (JP, A) International Publication No. 92/15041 (WO, A1) (58) Survey Field (Int. Cl. ⁷ , DB name) G03B 21/00 G03B 21/16 G03B 33/12

Claims (2)

(57) [Claims] 1. A power supply case, and a power supply case disposed inside the case.
A power supply system having a plurality of components, the which, an optical system for forming an optical image corresponding to the image information by processing a light beam emitted from a light source optically, an optical formed by the optical system A projection lens for enlarging and projecting an image, an outer case for housing the optical system and the power supply system, a cooling air inlet formed in the outer case, and an air outlet formed in the outer case, An intake fan for taking in air from the cooling air inlet into the exterior case, and an exhaust fan for exhausting the air inside the exterior case to the outside via the air exhaust port. A part of the air taken into the exterior case by the intake fan passes through the optical system, directly reaches the exhaust fan, and is discharged to the outside; Therefore, another part of the air taken into the interior of the exterior case cools the light source through the optical system, reaches the exhaust fan, and is discharged to the outside. Still another part of the air taken in through the optical system
Enter from one side of the power supply case, and
Cooling the plurality of components through the interior, the other side
From the power supply case to the exhaust fan, and then to the outside of the exterior case . 2. A power supply case, and a power supply case.
A plurality of components that are location, a power supply system and an optical system for forming an optical image corresponding to the image information by processing a light beam emitted from a light source optically, formed by the optical system A projection lens for enlarging and projecting the optical image, an outer case for housing the optical system and the power supply system, a cooling air intake formed in the outer case, and an air outlet formed in the outer case. A projection type display device, comprising: an intake fan for taking in air from the cooling air intake into the exterior case; and an exhaust fan for exhausting the air inside the exterior case to the outside via the air outlet. In the optical system, a light source and light emitted from the light source
A color separation optical system for separating light beams of colors, three liquid crystal light valves respectively modulating three color light beams separated by the color separation optical system, and three color light beams modulated by the three liquid crystal light valves And a color synthesizing optical system for synthesizing the liquid crystal light. After a part of the air taken into the exterior case by the intake fan passes along the three liquid crystal light valves, the air directly reaches the exhaust fan. The other part of the air discharged to the outside and taken into the exterior case by the intake fan passes along the three liquid crystal light valves, cools the light source, and then discharges the air. Another part of the air that reaches the fan and is exhausted to the outside, and that is taken into the interior of the exterior case by the intake fan, is a part of the three liquid crystal light valves. After passing along one of the power supply casing
From the side, passing through the inside of the power supply case and
Cool the components of the power case from the other side
After being discharged, leading to the exhaust fan, the outer cable
Projection display device characterized by comprising configured to be discharged to the scan outside.