JP2000112371A - Projection type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size, the electric power consumption and a noise of a projection type image display device by providing an image display device with a cooling constitution designed to make the cooling air quantity on both sides of a polarizing means larger than the cooling air quantity on both sides of a light control means. SOLUTION: A second guide plate 30 (separation guide plate) is constituted in parallel with a first guide plate 26 in a blowoff port 24B for a blue liquid crystal panel B. The height of this separation guide plate 30 is set lower than the height of the first guide plate 26. The first guide plate 26 acts to gather the cooling wind W blown off by a cooling fan like W1 to W3. The cooling wind W is, however, strongest right below the first guide plate 26 and the cooling wind of a polarizing plate 2B is not enough. If the constitution disposed with the distribution guide plate 30 in the blowoff port 24B is adopted, the fresh cooling wind at the distribution guide plate 30 is obtained and the cooling efficiency of the polarizing plate 2B existing right below the same is improved. Since the distribution of the air quantity can be easily set and concentrated cooling of a heat generation part can be easily executed and, the miniaturization of the cooling fan is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type image display device for enlarging and projecting an output signal from a personal computer and an image such as a CD / video onto a screen or the like, and more particularly to a cooling structure thereof.

[0002]

2. Description of the Related Art FIG.
This will be described with reference to FIG. As this type of projection type image display device, there is an image display device using three liquid crystal panels 3R, 3G and 3B of red, green and blue (hereinafter referred to as R, G and B). Such a projection type image display device includes a light source 1 that emits light L.
And a reflection system 10 for decomposing the light L into R, G, and B components LR, LG, and LB, and three liquid crystal panels 3R into which only one of the RGB components LR, LG, and LB is incident. ,
A lens system 20 for magnifying and projecting the components LR, LG, and LB that have passed through 3G and 3B onto a screen (not shown) in a superimposed manner, a cooling fan 4 for cooling the liquid crystal panels 3R, 3G, and 3B, and And a cabinet 5 for storage.

[0003] As shown in FIG.
First dichroic mirror 1 that passes only R and LG
11, a second dichroic mirror 112 that allows only the component LG to pass, a third dichroic mirror 113 that allows only the component LB to pass, a fourth dichroic mirror 114 that allows only the components LR and LB to pass, , And first to third total reflection mirrors 101 to 103 for reflecting the above-mentioned components. In addition, 6 shown in FIG. 4 is an infrared and ultraviolet cutoff filter.

A liquid crystal panel 3G on which an image corresponding to the component LG is displayed has a component LG that has passed through the first dichroic mirror 111 and the second dichroic mirror 112.
Is incident. Further, the first dichroic mirror 1 is provided on the liquid crystal panel 3R on which an image corresponding to the component LR is displayed.
11 and the component LR selectively reflected by the second dichroic mirror 112 is incident. Further, a liquid crystal panel 3 on which an image corresponding to the component LB is displayed.
The component LB selectively reflected by the first dichroic mirror 111 and reflected by the second total reflection mirror 102 is incident on B. The component LB that has passed through the liquid crystal panel 3B and the component LR that has passed through the liquid crystal panel 3R are incident on the third dichroic mirror 113. Further, the component LG that has passed through the liquid crystal panel 3G is incident on the fourth dichroic mirror 114 via the third total reflection mirror 103. Since the components LR and LB incident on the third dichroic mirror 113 are also incident on the fourth dichroic mirror 114, the components LR, LG and LB are incident on the fourth dichroic mirror 114.
Are superimposed and projected on a screen via the magnifying projection lens 20.

Since a high-luminance metal halide lamp is used as the light source 1, the temperature inside the cabinet becomes high. In the incident-side polarizing plates 2R, 2G, and 2B, the S wave or the P wave
Since any one of the light components of the wave passes, heat is generated by light that does not pass. Furthermore, the liquid crystal panel 3
In R, 3G, and 3B, heat is generated by passing light components LR, LG, and LB. These cooling operations are performed by the cooling fan 4. The cooling operation will be described in more detail with reference to the area around the liquid crystal panel 3R.

As shown in FIG. 5, a condenser lens 6R and an incident side polarizing plate 2R are provided on the light source side of the liquid crystal panel 3R. On the other hand, on the rear side of the liquid crystal panel 3R, an emission-side polarizing plate 7R is provided integrally with the liquid crystal panel. Further, a transparent air guide plate 8 is provided behind the emission-side polarizing plate 7R. The components around the liquid crystal panel are formed with a predetermined space through which the cooling air W from the cooling fan 4 can pass. Therefore, heat generated in the incident side polarizing plate 2R and the liquid crystal panel 3R can be radiated by the cooling air W.

[0007]

However, the above-mentioned projection type image display apparatus does not consider the distribution of the amount of cooling air W passing between the components. Since the amount of air passing between the components is automatically determined by the gap between the components and the flow path resistance due to the unevenness of the flow path surface, the cooling air W cannot be distributed at present. Generally, the amount of heat generated by the liquid crystal panel 3R and the polarizing plate 2R is larger in the case of the polarizing plate that blocks half of the light from the light source, and the amounts of generated heat are generally different from each other. Therefore, it is desirable that the flow rate of the cooling air W passing through both surfaces of the incident polarizing plate 2R be set to be larger than the flow rate passing through both surfaces of the liquid crystal panel 3R. Conventionally, in order to adjust the position of a liquid crystal panel after assembling, it is a fact that the air volume is not adjusted only by the interval between components. Giving an extra air volume to a place where the air volume is not required increases the total air volume, resulting in performance deterioration such as an increase in size of the fan, an increase in power consumption, an increase in noise, and the like.

The present invention not only efficiently distributes the cooling air from the liquid crystal panel, but also increases the air volume at the outlet close to the center of the fan, collects the cooling air that has cooled the liquid crystal panel again, and supplies the cooling air to the other heat generating parts. The present invention relates to the invention of a cooling fan unit for a cooling air intake unit of a projection type image display device, such as a method applied to cooling, a cooling method of a polarizing device, and an efficient blowing shape of a blowing port. Miniaturization, low power consumption, and low noise of a portable image display device.

[0009]

According to the present invention, in a projection type image display apparatus for displaying an image by irradiating light from a light source side to a light control unit via a polarizing means, a cooling air volume on both sides of the polarizing means is reduced. A configuration is provided that includes a cooling configuration that is larger than the cooling air volume on both sides of the light control unit.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the following means.

The first means relates to a method for efficiently cooling a liquid crystal panel and a polarizing plate. In the duct of the cooling fan unit comprising the fan and the duct of the projection type image display device of the present invention, a guide plate for air flow distribution is provided at an outlet corresponding to RGB by changing the height of the guide plate. It is.

The second means is that a wind collecting guide plate is formed together with the distribution guide plate at an outlet of the RGB near the center of the cooling fan. It is important that the front end of the wind collecting guide plate is configured to blow air into a position near the fan center of the outlet.

The third means is a recovery guide plate for recovering the cooling air that has passed through the liquid crystal panel or the polarizing plate again, by the second one of RGB.
Of the air outlet.

The fourth means constitutes a wind guiding portion for changing the direction of the cooling air in an arbitrary blowing portion other than the RGB blowing port.

A fifth means is that the number of outlets of a cooling fan unit composed of a cooling fan and a duct is limited to six for RGB, for a video / audio circuit, for a lamp power supply, and for a polarizing device.

In the first means, the distribution guide plates are formed in two stages with different heights so as to oppose the rotation direction of the fan, so that the cooling air impinging on the guide plates changes direction. Is distributed to the cooling air of the liquid crystal panel and the polarizing plate, and is blown out from the blowout port. Each distribution air volume can be easily adjusted by the height of the guide plate formed in two stages.

The second means is to collect the cooling air in the unused portion of the duct by the wind collecting guide plate, and the cooling air collected along the wind collecting guide plate has the least air volume at the outlet. It can be collected in parts.

The third means is such that a recovery guide plate is formed between the second outlet of the polarized light combining unit and a shield case forming the outside thereof, so that the polarized light combining unit, the shield case and the recovery guide are formed. Cooling air gathers again in the portion surrounded by the plate, and can be used as new cooling air for heat radiation of other heat generating parts.

The fourth means changes the flow direction of the cooling air flowing out of the outlet into one direction, so that it is possible to perform centralized cooling to the heat-generating portion and to have a large radiation effect.

The fifth means can efficiently use the cooling air from the cooling fan unit by limiting the number of outlets to six.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the configuration of the entire apparatus will be described with reference to FIG. FIG. 3 is a schematic configuration diagram showing one embodiment of the projection type image display device of the present invention. The minimum necessary component configuration is shown for easy understanding. 1 is a light source of a metal halide lamp, 11 is a polarizer, 12 is a cold filter, 13, 14, 15, and 16 are separated or combined dichroic mirrors, and 17 and 18 are total reflection mirrors. RGB liquid crystal panels 3R, 3G, 3 corresponding to the three primary colors of light
B and the incident-side polarizing plates 2R, 2G, and 2B are each configured as a predetermined one. Reference numeral 20 denotes a projection lens. 4
Is a cooling fan for intake, and 19 is a duct, and these two parts are referred to as a cooling fan unit for intake. Reference numeral 21 denotes a video / audio circuit 22 and a light source power supply circuit. An exhaust cooling fan unit 23 includes a duct and an exhaust fan. 38 is a shield case of the present apparatus. FIG. 3 is a configuration diagram viewed from the back side of the apparatus, that is, from the side where the cooling fan is located. A separation / combination unit having substantially the same shape is integrally formed on the opposite side of the duct 19.

In the projection type image display apparatus of the present invention having the above structure, the light L emitted from the light source 1 passes through the polarizing device 11, but passes only a predetermined light component P (S) wave. Further, infrared rays and ultraviolet rays other than visible light are cut off by the cold filter 12 and are incident on the dichroic mirrors 13 and 14. Each of the light is separated into a wavelength of a color corresponding to RGB and enters each of the incident polarizers 2 and the liquid crystal panel 3.
And the image is enlarged and projected by a projection lens 20 onto a screen (not shown) or the like. One, intake cooling fan 4
Are configured to cool the respective polarizing plates 2 and the liquid crystal panels 3 from the respective RGB outlets 24 by cooling air sucked from outside air.

Next, the first means and its features of the cooling fan unit for intake air of the apparatus of the present invention will be described in detail with reference to FIGS. FIG. 1 is a plan view illustrating in detail the duct 19 of the cooling fan unit of FIG. FIG. 2 shows A-
It is A sectional drawing. In FIGS. 1 and 2, a first guide plate 26 is continuously formed at the RGB outlet 24 so as to oppose the rotation direction 25 of the cooling fan 4.
The height of the first guide plate is determined by the ribs 19 forming the duct 19.
It is configured at the same height as a. A second guide plate 30 (distribution guide plate) is formed in the outlet B of B in parallel with the first guide 26. The height of the distribution guide plate 30 is
It is set lower than the first guide plate. 31 is a partition in the duct. Reference numeral 32 denotes a wind collecting guide plate. The partition 3
1 and the wind collecting guide plate 32 are provided at the same height as the rib 19a. Reference numeral 33 denotes a cover provided with a hole 33a through which the cooling air from the cooling fan 4 passes. The cover allows the cooling air from the cooling fan unit 19 to be blown out of the unit from each of the RGB outlets 24 and the six flow paths of the outlets 27, 28, and 29.

In the cooling fan unit having the above configuration,
The first guide plate 26, the cooling air W blown by the cooling fan 4, acts to collect as W ₁ to _W-3 shown by a broken line in FIG. 1. However, when only the guide plate 26 is used, the collected cooling air W is strongest immediately below the first guide plate, and becomes weaker as the distance from the guide plate 26 increases. In particular, at the outlet 24B formed near the center of the cooling fan 4, this tendency appears as a remarkable phenomenon. Therefore, the wind speed of the liquid crystal panel 3B located immediately below the guide plate 26 can obtain a sufficient wind speed, but the cooling wind of the polarizing plate 2B farther from the liquid crystal panel 3B is not sufficient.

[0026] Therefore, when the construction which arranged distributor guide plate 30 to the outlet 24B, to obtain a new cooling air W ₀ in the distribution guide plates 30 as shown in FIG. 2, the polarizing plate positioned on the right below The cooling efficiency of 2B is improved. The relationship is shown in FIG.
FIG. FIG. 6 shows a wind speed distribution immediately below the first guide plate 26 only. Cooling air W ₁ by the cooling fan 4 hits the first guide plate 26, but changes its direction to the outlet 24B direction, wind speed distribution at the outlet opening, the first guide plate 26 as shown in FIG. 6 The wind speed just below is the strongest.

FIG. 7 shows the first guide plate 26 and the distribution guide plate 3.
It is a wind speed distribution when both 0 are provided. As shown in FIG. 7, a strong wind speed W ₀ is newly obtained immediately below the distribution guide plate by the operation of the distribution guide plate 30. Accordingly, cooling of the polarizing plate disposed below the distribution guide plate 30 is promoted, and both the liquid crystal panel and the polarizing plate can be efficiently cooled. FIG.
The magnitudes of the wind speed just below the first guide plate 26 and the wind speed just below the distribution guide plate 30 can be set by the height h of the distribution guide plate.

In this embodiment, the case where the distribution guide plate is used only for the outlet of the B portion of RGB is shown, but it goes without saying that the distribution guide plate can be applied to the outlets other than the B portion if the distribution is necessary. . Incidentally, the reason why the distribution guide plate is used only in the portion B in the present embodiment is as follows. That is, in the projection image apparatus of the present invention, the RGB outlets are set to be as small as possible within the projection area of the cooling fan 4 in order to reduce the size of the entire apparatus. For this reason, of the cooling air blown into RGB, the amount of air in the portion B near the center of the fan decreases. FIG. 8 shows an example of the measurement result of the wind speed distribution of the cooling air flowing out of the cooling fan. As shown in FIG. 8, in the axial fan, the motor 4a located at the center of the fan requires
The wind speed at the center decreases.

The feature of the second means resides in the wind collecting guide plate 32. As described above, the air volume at the outlet 24B at the fan center position is smaller than the other outlets. Therefore, the amount of air blown by the wind collecting guide plate 32 to the area 34 that is substantially not used much is determined by the outlet 24.
B is to be collected. The position of the tip 32a of the wind collecting guide plate 32 is determined by the size S of the frontage of the outlet 24B.
It is desirable to be located at about 1/3 of the position. Thus, the cooling air from the unutilized regions 34, among outlet, most small air volume can not only collect the fan center side, smaller effect on the original flow of the cooling air W _1.

The third means and its features will be described with reference to FIGS. FIG. 9 is a view as seen from the separation / combination unit side in FIG. FIG. 10 is a DD sectional view of FIG. Only the components necessary to explain the third feature are shown. 9 and 10, on the upper surface of the separation / combination unit 36, second outlets 35 are respectively formed corresponding to RGB. Reference numeral 37 denotes a recovery guide plate which is arranged on the separation / synthesis unit 36 so as to surround the second outlet 35. Reference numeral 38 denotes a shield case for cutting noise, and 39 denotes a semiconductor formed on the lamp power supply circuit 22.

In FIG. 10, the cooling air W blown from the fan 4 passes through the outlet 19B from the duct 19 and enters the separation / combination to cool the liquid crystal panel 3B and the like. Thereafter, the separation / combination unit 3 is supplied from the second outlet 35B.
It flows out of 6. The cooling air that has flowed flows into the gap 40 surrounded by the shield case 38 and the recovery guide plate 37,
It acts to remove heat from the heat sink 41 integrated with the semiconductor 39 of the lamp power supply circuit.

The feature of the third means is that the cooling air once used for cooling is recovered and used again for cooling other heat-generating components. As shown in FIG. 9, in the present embodiment, two of the second outlets 35B and 35G are surrounded by the collection guide plate 37, but naturally one can perform the same operation. The collection guide plate 37 forms a gap 40 between the shield case 38 and the separation / combination unit 36, and the second outlet 35
Of the cooling air coming out of the shield case 3
The third feature can be achieved even when the cover is integrated with the collection guide plate 37 and the flow path is formed independently without forming the flow path 8 as a part of the flow path.

Next, the fourth means and its features will be described with reference to FIG. FIG. 11 is a schematic cross-sectional view taken along the line CC in FIG. Reference numeral 29a denotes a wind guide portion formed at the tip of the outlet 29 to change the flow of cooling air. The cover 33 becomes thicker as it approaches the outlet, and the duct is chamfered at the tip of the outlet. Cooling air generated by the cooling fan 4 flows W ₇ for cooling the liquid crystal panels 3R and the polarizer 2R like and the flow W ₈ toward the outlet 29 occurs. The direction of the flow of the cooling air W ₈ is changed by an air guide 29 a having a slope and a chamfer at an outlet 29. The outlet 29 is, as shown in FIG.
In this embodiment, the cooling air flowing out of the outlet 29 is opposed to the lamp power supply circuit 22.
Applied for cooling. The mounting position of the duct is located below the light source power supply circuit 22, and the air guide portion 29a
The cooling air flowing out of the outlet 29 by the action of
By changing the direction, the current flows in the direction of the lamp power supply circuit.

Next, the fifth means and its features will be described with reference to FIG. FIG. 12 shows the same duct 19 as FIG.
FIG. The features of the cooling unit of the present invention are as follows:
The intake air is allowed to flow out of six outlets. The flow shown in W ₁ to _W-6. Each R
The outlet 24 corresponding to the GB and the other outlet 27,
It blows out from six flow paths of 28 and 29. The outlet 27 is used for cooling the video / audio circuit (21 in FIG. 3), the outlet 28 is used for cooling the polarizer 11, and the outlet 29 is used for cooling the lamp power supply circuit (22 in FIG. 3). The cooling fan unit for air intake according to the present invention includes the fan 4 (not shown), the cover 33, and the duct 19, and the configuration allows the flow of the cooling air in the six flow paths.

The cooling air W ₆ flowing out of the outlet 28 in the flow path is used for cooling the polarizing device 11 as described above, but is also used for cooling the light source in the present device.
The flow of the cooling air W _6, FIG. 12 will be described in detail with reference to FIG. 13. FIG. 13 is an EE cross section of FIG. A separation / combination unit 36 having substantially the same shape as the duct 19 is also shown. Reference numeral 11 denotes the above-described polarizing device, and reference numeral 42 denotes a heat shield plate configured to sandwich the polarizing device from both sides. The heat shield plate 42
Has an action of blocking light reflected by the polarizing device 11,
The temperature rise of the synthesis / separation unit case 36a is limited.
43 is a ventilation hole formed in the duct. Outlet 2
The cooling air W ₆ passing through 8 passes through the ventilation holes 43 and flows into the separation / combination unit 36 like the cooling air W ₆₁ and W ₆₂ . Cooling air W ₆₁ flowing from these vents 43a is a exit side 11a of the separating-combining unit polarizer 11 is cooled and flows also into the gap between the heating plate 42 shield separation synthesis unit case 36a. Thereafter the cooling air openings 36b of the separation synthesis unit, towards the light source exits as cooling air W _60.

On the other hand, the cooling air W ₆₂ escaping from the ventilation holes 43b
Is the incident side 11b of the polarizing device is cooled toward the opening 36b et source as the cooling air W _60. The cooling air W ₆ being not only to cool the polarizing device is for use in cooling of the light source.

Another embodiment of the present invention will be described with reference to FIG. FIG. 14 is a sectional view of a main part of the cooling fan unit of the present invention. In the case of this embodiment, the distribution guide plate 30 is used twice. The cooling air generated by the cooling fan 4 is separated by each distribution guide plate as shown by a broken line,
It flows into a flow path formed by the condenser lens 6, the incident side polarizing plate 2, the liquid crystal panel 3, and the like. By applying the distribution guide plate 30 corresponding to the number of components in the configured separation / combination unit, the cooling air is separated into the flow path configured by each component, and predetermined cooling can be performed.

FIG. 15 shows still another embodiment of the present invention. This is an example in which the distribution guide plate described above is applied by extending a part of a support frame 2a that supports the polarizing plate 2 into a duct.
FIG. 15 also shows that the first guide plate 26 can be easily extended into the duct by using components (separately, the liquid crystal panel support frame 3a in this embodiment) in the separation and synthesis.

From the first means, a liquid crystal panel or a polarizing plate corresponding to RGB can be cooled in accordance with the amount of heat generated. The amount of air coming out of each RGB outlet can be adjusted by the positional relationship between the fan and the duct, the shape of the duct, the arrangement of guide plates in the duct, and the like. Further, the distribution of the air volume at each outlet can be easily set in accordance with the magnitude of the calorific value of the heat generating portion. Therefore, the waste of the air volume of the cooling fan can be eliminated.

From the second means, the positions of the outlets of RGB can be arranged compactly as a whole. Even a cooling fan with a small air volume can secure a sufficient air volume. In addition to taking in the air volume collected by the wind collecting guide plate, the air volume collected around the cooling fan can be easily taken in. Thus, the optical components in the separation / combination unit can be arranged compactly regardless of the position of the outlet.

From the third means, the cooling air used for cooling the optical components corresponding to each RGB is recovered again by the recovery guide plate provided outside the separation / synthesis unit, and is used for cooling other heating components. No new installation of a cooling fan is required.

Since the direction of the cooling air blown out of the duct can be changed from the fourth means, the centralized cooling to the heat generating portion can be easily performed. This can prevent the cooling fan from increasing in size.

From the fifth means, it is possible to reuse the cooling air from the respective outlets, so that it is not necessary to provide more outlets than necessary. As a result, the static pressure in the duct of the cooling fan unit is increased, the momentum of the cooling air coming out of the outlet can be maintained, and effective cooling can be performed even with a small cooling fan.

[0044]

As described above, according to the present invention, it is possible to cool a liquid crystal panel, a polarizing plate, and the like corresponding to RGB in accordance with each heat value, and to easily set the distribution of the air volume. it can. Therefore, waste of the air volume of the cooling fan can be eliminated, and the centralized cooling to the heat generating portion can be easily performed, so that the cooling fan can be downsized. Also, the arrangement of the optical components in the separation / combination unit can be made compact.

That is, according to the present invention, it is possible to realize a projection type image display apparatus which is small in size, consumes low power, has low noise, and has extremely high commercial value.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cooling fan unit showing one embodiment of the device of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a schematic configuration diagram of a projection-type image display device according to an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a projection type image display device showing a conventional example.

FIG. 5 is a cross-sectional view of a main part of an R part of FIG. 4 showing a conventional example.

FIG. 6 is a diagram illustrating the principle of the cooling fan unit of the present invention.

FIG. 7 is a diagram illustrating the principle of the cooling fan unit of the present invention.

FIG. 8 is a principle diagram showing a wind speed distribution of a cooling fan.

FIG. 9 is a plan view of a separation / combination unit showing another embodiment of the present invention.

FIG. 10 is a sectional view taken along the line DD in FIG. 3, showing another embodiment of the present invention.

FIG. 11 is a sectional view taken along the line CC in FIG. 1, showing another embodiment of the present invention.

FIG. 12 is a plan view of a duct portion of a cooling fan unit showing another embodiment of the present invention.

FIG. 13 is an EE sectional view of FIG. 12 showing another embodiment of the present invention.

FIG. 14 is a sectional view of a main part showing another embodiment of the present invention.

FIG. 15 is a sectional view of a main part showing another embodiment of the present invention.

FIG. 16 is a sectional view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light source, 11 ... Polarizing device, 12 ... Cold mirror, 4 ... Cooling fan, 24, 27, 28, 29 ... Outlet, 26 ... 1st guide plate, 30 ... Distribution guide plate, 32 ... Wind collection guide plate , 37 ... Collection guide plate.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G03B 21/16 G03B 21/16 H04N 5/74 H04N 5/74 Z 9/31 9/31 E (72) Inventor Takashi Tsunoda 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi, Ltd.Video Media Research Laboratories Co., Ltd. Inventor Takesuke Maruyama 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture

Claims (1)

[Claims] 1. A projection type image display device for displaying an image by irradiating light from a light source side to a light control unit via a polarizing means, wherein a cooling air flow on both sides of the polarizing means is a cooling air flow on both sides of the light control unit. A projection type image display device, comprising: a cooling structure configured to increase the number of cooling devices.