JP3460564B2 - Projection display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention optically processes a light beam emitted from a light source lamp to form an optical image corresponding to image information, and magnifies and projects the optical image on a projection surface by a projection lens. The present invention relates to a projection display device including an optical system and an outer case that houses the optical system.

[0002]

2. Description of the Related Art Conventionally, an optical unit that optically processes a light beam emitted from a light source lamp unit to form an optical image corresponding to image information, and projects this optical image in an enlarged manner on a projection surface by a projection lens unit. And a power supply unit that supplies electric power to the optical unit and the light source lamp unit, an exterior case that houses the optical unit and the power supply unit, and a plurality of circuit boards for controlling the optical unit. Display devices are known.

The optical unit of the projection type display device usually includes, in addition to the above-mentioned light source lamp unit and projection lens unit, a color separation optical system for separating a light beam emitted from the light source lamp into light beams of three primary colors, and a separated light beam. And a color combining optical system that combines the modulated light beams and outputs the combined light beams to the projection lens unit.

The color separation optical system has three dichroic mirrors housed and arranged in a light guide in which a predetermined optical path is secured together with a light source lamp unit. The light flux from the light source lamp has these three dichroic mirrors. Are separated into three primary colors of R, G, and B. The modulation system has three liquid crystal light valves provided according to the separated light fluxes, and each of the separated light fluxes is modulated by these three light valves for each color based on image information, It is emitted as a modulated light beam. The color combining optical system is composed of a prism unit that combines the modulated light fluxes and outputs the combined light to the projection lens.

In such a projection display device, a cooling mechanism is incorporated in order to cool the light source lamp unit serving as a heat source, the power supply unit, the optical unit and the circuit board. Specifically, the cooling air was introduced from the air inlet formed in the outer case by the intake fan, the cooling air was made to flow through the internal heat source, and then formed in the outer case by the exhaust fan. Air is exhausted from the exhaust port.

Among the heat sources described above, the light valve forming the optical unit has lower heat resistance than other heat sources, and therefore needs to be cooled quickly. Therefore, the conventional cooling mechanism is configured to form an air intake port of the outer case below the light valve and the prism, and forcibly blow cooling air to the light valve and the prism by an intake fan near the air intake port. Was.

[0007]

However, such a conventional cooling mechanism has the following problems. That is, in the cooling mechanism that blows the cooling air to the light valve, the prism, etc., the cooling air is blown to the light valve, the prism, etc. so as to swirl, so that the cooling of the light valve, the prism, etc. is biased. Therefore,
There is a problem that it is difficult to uniformly and efficiently cool the light valve, the prism and the like.

Further, the vortex cooling air tends to spread toward the outside of the vortex, and it is difficult to guide all the cooling air to the light valve, prism, etc. An object of the present invention, which has a problem that cooling efficiency becomes poor, is to optically process a light beam emitted from a light source lamp unit to form an optical image corresponding to image information, and to project the optical image. In the projection display device including the optical unit for enlarging and projecting on the projection surface and the outer case that houses the optical unit, the modulation system and the color combining optical system that configure the optical unit can be efficiently cooled. It is to provide a projection display device.

[0009]

In order to achieve the above object, a projection display device according to the present invention optically processes a light beam emitted from a light source lamp to form an optical image corresponding to image information. What is claimed is: 1.A projection type display device comprising: an optical system for forming and enlarging and projecting this optical image on a projection surface by a projection lens; and an exterior case for accommodating the optical system, wherein the optical system is a light flux of plural colors. A modulation system that modulates each of the modulated light fluxes based on the image information and emits the modulated light fluxes, and a color combining optical system that combines the modulated light fluxes and outputs the combined light to the projection lens. An air intake for taking in cooling air from the outside of the apparatus and cooling the modulation system and the color combining optical system is formed, and a fan forcibly taking in the cooling air from the air intake is provided in the modulation system and the color A side opposite to the previous SL air inlet across the formation optical system, and the optical system and the color synthesizing optical system
It is placed so as to be sandwiched between the circuit board that controls the
Characterized in that that.

According to the present invention as described above, the fan is arranged on the opposite side of the air intake with the modulation system and the color synthesizing optical system sandwiched therebetween, and the modulation system and the color synthesizing optical system are provided by cooling air on the suction side of the fan. The system is cooled. Therefore, the modulation system and the color synthesizing optical system can be uniformly cooled without unevenness, and the cooling efficiency of these can be significantly improved. Also,
Even if the cooling air flow on the suction side is spiral,
Since the air flows in such a direction that it converges on the fan, most of the cooling air taken in from the air intake port is used for cooling the modulation system and the color combining optical system, and these can be cooled efficiently.

In the above, the above-mentioned projection type display device includes a structure on which the modulation system and the color synthesizing optical system are mounted, and a light guide which is provided adjacent to the structure and accommodates the color separation optical system. And the fan is preferably provided in the light guide.

That is, a projection lens is attached to the structure for fixing the modulation system and the color synthesizing optical system together with the modulation system and the color synthesizing optical system. Since this projection lens is a heavy object, an integrally molded product made of metal such as magnesium is used as the structure. On the other hand, since the light guide accommodates only relatively lightweight components such as a dichroic mirror and a lens that form a color separation optical system, it is usually made of plastic. Therefore, if the fan is provided in the plastic light guide, the fan can be easily attached to the light guide, and the manufacture of the projection display device can be simplified. In addition, because not provided the fan to the structure lower surface as in the conventional fan, metal molded article in which the structure necessary to attach the fan rather name it is possible to simplify the shape of the structure.

Further, it is preferable that the above-mentioned air intake is formed on the lower surface of the outer case, and the fan is arranged in the upper part of the outer case with the modulation system and the color synthesizing optical system interposed therebetween.

That is, each color-separated light flux emitted from the color-separation optical system must enter the front surfaces of the modulation system and the color-synthesis optical system. Therefore, the height dimension of the light guide that houses the color separation optical system is set to be larger than the height dimension of the modulation system and the color synthesis optical system, and the dead space is set above the modulation system and the color synthesis optical system. Will occur. Therefore, if you place a fan in this dead space,
The components inside the projection display device can be efficiently arranged without waste, which can contribute to downsizing of the projection display device. Further, since the air intake port is formed on the lower surface of the outer case, it becomes difficult for dust and the like in the outside air to adhere and enter, and the dust prevention inside the device can be further promoted.

Further, it is preferable that a circuit board for controlling the optical system is provided on the above-mentioned optical system, and a fan is arranged adjacent to the extending direction of the circuit board, and in particular, the circuit is provided. It is preferable that the substrate faces the blowing side surface of the fan.

That is, since the fan is arranged along the extending direction of the circuit board, the cooling air blown from the fan can be guided along the circuit board, and the cooling efficiency of the circuit board is significantly improved. To be done. In particular, when the circuit board faces the blowout surface of the fan, the cooling of the circuit board is significantly improved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

(1) Overall Configuration of Device FIG. 1 and FIG. 2 are schematic perspective views of a projection display device 1 according to an embodiment of the present invention. FIG. 1 is a perspective view seen from the top side. 2 is a perspective view seen from the lower surface side.

The projection type display apparatus 1 separates the luminous flux emitted from the light source lamp unit into three primary colors of red (R), green (G) and blue (B), and separates the luminous flux of each color into a liquid crystal light valve (modulation system). ) Corresponding to the image information, and the modulated light fluxes of the respective colors after being modulated are combined by a prism (color combining optical system), and enlarged and displayed on the projection surface via the projection lens unit 6. is there. The components of the optical unit 10 other than the projection lens unit 6 are the outer case 2
It is stored inside.

(2) Structure of Exterior Case The exterior case 2 is basically composed of an upper case 3 that covers the upper surface of the device, a lower case 4 that constitutes the bottom surface of the device, and a rear case 5 that covers the back surface portion. ing.

As shown in FIG. 1, the upper case 3
A large number of communication holes 25R and 25L are formed at the left and right ends on the front side of the upper surface. An operation switch 26 for adjusting the image quality, focus, etc. of the projection display device 1 is provided at a substantially central portion of the upper surface of the upper case 3.

As shown in FIG. 2, on the bottom surface of the lower case 4, there is a lamp replacement lid 27 for replacing a light source lamp unit 8 (described later) housed therein, and air for cooling the inside of the apparatus. An air filter cover 23 having an intake 240 is provided.

Also, as shown in FIG. 2, on the bottom surface of the lower case 4, there are foots 31R, 3R at the left and right corners of the front end thereof.
1L is provided, and a foot 31C is provided at a substantially central portion of the rear end. In addition, the foot 31R, 31L is the lever 3
By pulling 11 upward, it is possible to move back and forth in the protruding direction, whereby the vertical position of the projection screen on the screen can be changed.

As shown in FIG. 2, the rear case 5 is provided with an AC inlet 51 for supplying external power and various input / output terminal groups 50 on the right side, and adjacent to these input / output terminal groups 50, An exhaust port 160 for discharging the air inside the device is formed.

(3) Internal Structure of Device FIGS. 3 to 5 show the internal structure of the projection display device 1. 3 and 4 are schematic perspective views of the inside of the apparatus, and FIG. 5 is a vertical cross-sectional view of the projection display apparatus 1.

As shown in these figures, inside the outer case 2, a light source lamp unit 8, an optical unit 10,
A circuit board 11 and a power supply unit 7 are arranged.

The light source lamp unit 8 constitutes a light source portion of the projection display apparatus 1. Although not shown in these figures, a light source apparatus including a light source lamp and a reflector,
A lamp housing for accommodating the light source device is provided, and the light source lamp unit 8 can be detached from the lamp replacement lid 27 described above.

The optical unit 10 is a unit which optically processes the light flux emitted from the light source lamp unit 8 to form an optical image corresponding to image information, and includes an illumination optical system 923, a color separation optical system 924, A modulation system 925 and a prism unit 910 as a color combining optical system are included. Modulation system 925 and prism unit 91
The optical elements of the optical unit 10 other than 0 are vertically sandwiched and held between the upper and lower light guides 901 and 902. The upper light guide 901 and the lower light guide 902 are fixed to the lower case 4 side with fixing screws. Also, these light guides 9
01 and 902 are also fixed to the prism unit 910 side by fixing screws.

As shown in FIG. 6, the prism unit 910 having a rectangular parallelepiped shape is fixed to the back surface side of a head plate 903, which is a structural body having a substantially L-shaped side surface, which is made of an integrally molded magnesium product, by a fixing screw. . Also, the modulation system 925
Light valves 925R, 925G, and 92 that compose the
5B is disposed so as to face the three side surfaces of the prism unit 910, and is similarly fixed to the head plate 903 with a fixing screw. Further, on the front surface of the head plate 903, the base end side of the projection lens unit 6 is also fixed by a fixing screw. As shown in FIG. 5, the head plate 903 having the prism unit 910, the modulation system 925, and the projection lens unit 6 mounted thereon is fixed to the lower case 4 with fixing screws.

The circuit board 11 is for controlling the above-mentioned light source lamps, liquid crystal light valves 925R, 925G, 925B, etc., and is arranged above the optical unit 10 as shown in FIGS. The portion on the front end side of the device is electrically connected to the operation switch 26 provided on the upper case 3, and the portion on the rear end side of the device is electrically connected to the input / output terminal group 50 of the rear case 5. A rod-shaped projection 9011 is formed on the upper surface of the upper light guide 901, and the circuit board 11 is provided on the projection 9011. This is because a predetermined gap is provided between the circuit board 11 and the light guide 901 so that the cooling air flows along the circuit board 11.

The power supply unit 7 supplies electric power to the optical unit 10 and the light source lamp unit 8,
It is arranged beside the optical unit 10 and is electrically connected to the AC inlet 51 of the rear case 5 at the rear end side of the device. The power supply unit 7 is provided with the exhaust fan 1 provided in a portion adjacent to the sound source speakers 251R and 251L and the light source lamp unit 8 provided at positions corresponding to the communication holes 25R and 25L of the upper case 3.
6. Electric power is also supplied to the intake fan 71 described later.
An intake fan 7a is provided on the side surface of the power supply unit 7 facing the projection lens unit 6.

(4) Structure of Optical System Next, the structure of the optical system of the projection display apparatus 1 will be described with reference to FIG.
It will be described based on the schematic diagram shown in FIG.

As described above, the optical unit 10 includes the illumination optical system 923 for making the in-plane illuminance distribution of the light flux (W) from the light source lamp unit 8 uniform, and the illumination optical system 923.
Color separation optical system 924 that separates the light flux (W) from the light into red (R), green (G), and blue (B), and a modulation system 925 that modulates each color light flux R, G, and B according to image information. And a prism unit 910 as a color combining optical system for combining the modulated light beams of the respective colors.

The illumination optical system 923 includes a reflection mirror 931 that bends the optical axis 1a of the light flux W emitted from the light source lamp unit 8 in the front direction of the apparatus, and a first lens plate 921 that sandwiches the reflection mirror 931. The first lens plate 921 including the second lens plate 922 and the second lens plate 922 has a plurality of rectangular lenses arranged in a matrix, and divides the light beam emitted from the light source into a plurality of partial light beams. , Each partial light beam is condensed in the vicinity of the second lens plate 922.

The second lens plate 922 has a plurality of rectangular lenses arranged in a matrix, and each partial luminous flux emitted from the first lens plate 921 constitutes a light valve 925R constituting a modulation system 925. , 925G, 925B
It has a function to be superimposed on (described later).

As described above, in the projection display apparatus 1 of this example, the illumination optical system 923 causes the liquid crystal light valve 925.
Since the R, 925G, and 925B can be illuminated with light having a substantially uniform illuminance, it is possible to obtain a projected image with no illuminance unevenness.

The color separation optical system 924 includes a blue-green reflection dichroic mirror 941 and a green reflection dichroic mirror 9.
42 and a reflection mirror 943. First, in the blue-green reflection dichroic mirror 941, the blue light flux B included in the light flux W emitted from the illumination optical system 923.
And the green light flux G is reflected at a right angle and goes toward the green reflection dichroic mirror 942.

The red luminous flux R passes through the blue-green reflection dichroic mirror 941, is reflected at a right angle by the rear reflection mirror 943, and is emitted from the emitting portion 944 of the red luminous flux R to the prism unit 910 side. Next, of the blue and green luminous fluxes B and G reflected by the blue-green reflection dichroic mirror 941, the green reflection dichroic mirror 94
In FIG. 2, only the green light flux G is reflected at a right angle and is emitted from the emitting portion 945 of the green light flux G to the color combining optical system side. The blue light flux B that has passed through the green reflection dichroic mirror 942 is guided from the light emitting system 946 of the blue light flux B to the light guide system 9
It is emitted to the side of 27. In this example, all the distances from the emission part of the light flux W of the illumination optical system 923 to the emission parts 944, 945, 946 of the respective color light fluxes in the color separation optical system 924 are set to be equal.

The red and green luminous fluxes R of the color separation optical system 924,
Condensing lenses 951 and 952 are arranged on the emission sides of the G emission sections 944 and 945, respectively. Therefore,
The red and green luminous fluxes R and G emitted from the respective emission portions are incident on these condenser lenses 951 and 952 and are collimated.

The red and green luminous fluxes R and G thus collimated pass through the incident side polarization plates 960R and 960G and enter the liquid crystal light valves 925R and 925G, where they are modulated, and image information corresponding to each color light is obtained. Is added. That is, these liquid crystal light valves are switching-controlled by drive means (not shown) in accordance with image information, whereby the respective color lights passing therethrough are modulated. As such driving means, known means can be used as they are. On the other hand, the blue light flux B is guided to the corresponding liquid crystal light valve 925B via the light guide system 927, and is similarly modulated here according to the image information. As the liquid crystal light valves 925R, 925G, and 925B of this example, for example, those using a polysilicon TFT as a switching element can be adopted.

The light guide system 927 is used for emitting the blue luminous flux B.
6, a condenser lens 954 arranged on the exit side, an entrance side reflection mirror 971, an exit side reflection mirror 972, an intermediate lens 973 arranged between these reflection mirrors, and a front side of the liquid crystal light valve 925B. Condensing lens 95
The blue light flux B emitted from the condenser lens 953 passes through the incident side polarization plate 960B and is incident on the liquid crystal light valve 925B to be modulated. The optical path length of each color luminous flux, that is, the distance from the light source lamp 181 to each liquid crystal panel, is the longest for the blue luminous flux B, and therefore,
The light amount loss of this luminous flux is the largest. However, the light guide system 9
By interposing 27, the light amount loss can be suppressed.

Next, each liquid crystal light valve 925R, 92
Each color light flux R, G, B modulated through 5G, 925B
Enter the prism unit 910 through the exit side polarization plates 961R, 961G, and 961B, and are combined here. Then, the color image combined by the prism unit 910 is enlarged and projected on the projection surface 100 at a predetermined position via the projection lens unit 6.

(5) Cooling Structure Inside the Device Next, the cooling structure inside the device in the above-mentioned projection display device 1 will be described. As shown in the partial cross-sectional view of FIG. 8, an air intake port 24 formed on the bottom surface of the lower case 4
0 above the modulation plate 9 via the head plate 903.
25 and the prism unit 910 are arranged, and an intake fan 71 for taking in cooling air from the air intake 240 is further arranged on the upper part thereof.

An intake opening 903a is formed on the lower surface of the head plate 903 for guiding the cooling air to the modulation system 925 and the prism unit 910, and corresponds to the plane position of the air intake 240 of the lower case 4. There is. As shown in FIG. 9, an intake-side dustproof filter 81 is provided in the intake opening 903a and is detachably attached to the head plate 903.

The intake side dustproof filter 81 is a rectangular frame portion 81a made of ABS resin with a sponge 81b attached thereto, and two engaging projections 81c and the surface of the intake side dustproof filter 81 are provided on the outer peripheral portion thereof. Fitting protrusion 8 that bends inward inward
1d are formed.

On the other hand, a rib 903b is formed on the lower surface of the head plate 903 so as to surround the outer circumference of the intake opening 903a, and an engaging projection 81c is formed on the rear end side surface of the rib 903b.
Is formed with two engaging holes 903c into which the ribs 90 are inserted.
A fitting hole (not shown) into which the fitting protrusion 81d is inserted is formed on the front end side surface of 3b.

The dust filter 81 on the intake side is attached to the head plate 903.
When attaching to the
3c, and the intake side dustproof filter 81 is attached to the inside of the rib 903b with the fitting protrusion 81d bent inward. After mounting, the fitting protrusion 81d expands outward due to elasticity, fits into the fitting hole, and is retained. As aforementioned,
Since the head plate 903 is directly screwed and fixed to the lower case 4, the intake side dustproof filter 81 described above is provided with the air intake between the lower surface of the head plate 903 and the inner surface of the lower case 4 in the outer case 2. It is arranged so as to cover the inlet 240.

Upper and lower light guides 901 and 902 are arranged adjacent to each other on the head plate 903, and the modulation system 925 and the prism unit 910 have the lower light guide 9 on the side surface.
A side wall and an upper part of 02 are covered with an upper light guide 901. As shown in FIG. 8, an intake fan 71 is provided on the lower surface of the upper light guide 901. The intake fan 71 has an intake side on the lower side and an outlet side on the upper side, and a space between the modulation system 925 and the prism unit 910. It is designed to suck up air. Further, an exhaust opening 901a is formed in the upper light guide 901 corresponding to the fixed position of the intake fan 71, and the upper surface thereof is covered with an exhaust side dustproof filter 82 made of a metal mesh.

The circuit board 11 is arranged above the intake fan 71, and the intake fan 71 is arranged along the extending direction of the circuit board 11. The circuit board 11 is arranged to face the blowing surface of the intake fan 71 through the exhaust opening 901a.

Next, the flow of the cooling air will be described with reference to FIGS.

By the rotation of the intake fan 71, the cooling air is forcibly taken into the inside of the apparatus from the air intake 240.

After the dust is removed by the intake-side dustproof filter 81, the taken-in cooling air is guided to the modulation system 925 and the prism unit 910 through the intake opening 903a to cool them. The modulation system 92
5 and the prism unit 910, the lower light guide 9
Since it is surrounded by the side wall of 02, this serves as a duct, and most of the cooling air is guided to the modulation system 925 and the prism 910.

After cooling the modulation system 925 and the prism unit 910, the cooling air is discharged from the exhaust opening 901a.

The cooling air discharged from the exhaust opening 901a is blown onto the circuit board 11 to
1 toward the rear side of the device along the extension direction of the circuit board 11
To cool.

The cooling air that has passed through the circuit board 11 is
After being supplied to the light source lamp unit 8 and cooled, the light source lamp unit 8 is discharged to the outside of the apparatus by the exhaust fan 16 and the exhaust port 160.

In order to cool the power supply unit 7, the built-in intake fan 7a takes in cooling air from the gap between the projection lens unit 6 and the outer case 2 and discharges it from the side surface on the rear end side of the device, and the light source lamp unit. After cooling 8
In the same manner as described above, the exhaust fan 16 discharges it to the outside of the apparatus.

(6) Effects of the embodiment According to this embodiment described above, the following effects are obtained.

That is, the intake fan 71 has the modulation system 925.
And a prism unit 910 forming a color combining optical system
Is arranged on the opposite side of the air intake 240 with the cooling air on the suction side of the intake fan 71 interposed therebetween.
25 and the prism unit 910 are cooled.
Therefore, the modulation system 925 and the prism unit 910 can be uniformly cooled without unevenness, and the cooling efficiency of these can be significantly improved. In addition, even if the flow of the cooling air on the suction side has a vortex shape, it flows in the direction in which it converges on the intake fan 71, so that most of the cooling air taken in from the air intake 240 is a modulation system and color combination. It is used for cooling the optical system, and these can be cooled efficiently.

Further, since the intake fan 71 is provided on the lower surface of the plastic upper light guide 901, the intake fan 71 can be easily attached to the upper light guide 901, which simplifies the manufacture of the projection display apparatus 1. Can be achieved. In addition, like a conventional projection display device,
Since the intake fan is not provided on the lower surface of the head plate 903, it is not necessary to form a mounting hole or the like in the head plate 903 which is a metal integrally molded product, and the shape of the head plate 903 is simplified to reduce the manufacturing cost. it can.

Further, the air intake fan 71 has the exterior case 2 between the prism unit 910 and the upper light guide 901.
Since it is arranged in the upper space, the space efficiency inside the outer case 2 is improved, and the projection display device 1 can be downsized. In addition, since the air intake port 240 is formed on the bottom surface of the lower case 4, it becomes difficult for dust and the like in the outside air to adhere and enter, and the dust inside the device can be further promoted.

Since the intake fan 71 is arranged along the extending direction of the circuit board 11, the cooling air blown out from the intake fan can be guided along the circuit board, and the circuit board 11 can be cooled. The efficiency can be greatly improved. Particularly, the board surface of the circuit board 11 is the intake fan 71.
Since it is opposed to the blow-out surface of, the cooling efficiency is remarkably improved. In addition, the upper light guide 901 and the circuit board 1
Since a predetermined gap is provided between the two, if this gap is used, cooling air can be sent to the light source lamp unit 8 or the like arranged on the rear end side of the device without providing a duct or the like. This contributes to simplification and downsizing of the internal structure of the projection display apparatus 1.

(7) Modification of Embodiments The present invention is not limited to the above-described embodiments, but includes the following modifications.

That is, in the above-described embodiment, the air intake 240 is formed on the lower surface of the exterior case 2 and the intake fan 71 is arranged in the upper part of the apparatus. However, the present invention is not limited to this, and the air intake is exterior. The intake fan 71 may be formed on the side surface of the case, and may be arranged in a region on the opposite side with the modulation system and the color combining optical system interposed therebetween.

Further, in the above embodiment, the intake fan 71
Although the above is provided in the upper light guide 901, the present invention is not limited to this, and the intake fan may be arranged above the inside of the device by an independent supporting structure.

Further, in the above-described embodiment, the intake side dustproof filter 81 is detachably provided on the head plate 903, but the invention is not limited to this, and the intake side dustproof filter may be provided on the air filter cover closing the air intake. Good.

In addition, the specific structure, shape, and the like at the time of carrying out the present invention may be other structures as long as the object of the present invention can be achieved.

[0067]

According to the projection display device of the present invention described above, the intake fan sandwiches the modulation system and the color synthesizing optical system,
Since it is arranged on the opposite side of the air intake, the modulation system and the color combining optical system can be uniformly cooled without unevenness,
These cooling efficiencies can be greatly improved.

[Brief description of drawings]

FIG. 1 is an external perspective view of a projection display device according to an embodiment of the present invention as viewed from above.

FIG. 2 is an external perspective view of the projection display device according to the embodiment as seen from below.

FIG. 3 is a perspective view showing an internal structure of the projection display device in the embodiment.

FIG. 4 is a perspective view showing an internal optical system of the projection display device in the embodiment.

FIG. 5 is a vertical cross-sectional view of the projection display device in the embodiment.

FIG. 6 is a modulation system, color combining optical system, and
It is an external perspective view showing the structure which mounts a projection lens unit.

FIG. 7 is a schematic diagram for explaining a structure of an optical system of the projection type display device in the embodiment.

FIG. 8 is a partial cross-sectional view for explaining the cooling structure of the projection type display device in the embodiment.

FIG. 9 is a modulation system, color combining optical system, and
It is an external appearance perspective view showing the lower surface of the structure which mounts a projection lens unit.

[Explanation of symbols]

1 Projection display device 2 exterior case 6 Projection lens unit 8 Light source lamp unit 10 Optical unit 71 Intake fan 240 Air intake 901,902 Light guide 903 structure (head plate) 910 color synthesis optical system 924 color separation optical system 925 modulation system 11 circuit board W luminous flux

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03B 21/00-21/30

Claims (5)

(57) [Claims] 1. An optical system in which a light beam emitted from a light source lamp is optically processed to form an optical image corresponding to image information, and the optical image is enlarged and projected on a projection surface by a projection lens. A projection display device including an outer case that houses an optical system, wherein the optical system modulates each of a plurality of light fluxes of a plurality of colors based on the image information and emits a modulated light flux,
A color synthesizing optical system for synthesizing each of the modulated light fluxes and emitting it to the projection lens; cooling air is taken into the outer case from the outside of the apparatus to cool the modulation system and the color synthesizing optical system. An air inlet is formed, and a fan forcibly taking in the cooling air from the air inlet sandwiches the modulation system and the color combining optical system.
In a front Symbol opposite the air intake, and a circuit group for controlling the optical system and the color synthesizing optical system
A projection display device, which is arranged so as to be sandwiched between a plate and the plate . 2. The projection display device according to claim 1, wherein a structure on which the modulation system and the color combining optical system are mounted, a structure provided adjacent to the structure, and the color separation optical system are provided. And a fan for accommodating the light, the fan being provided in the light guide. 3. The projection display device according to claim 2, wherein the air inlet is formed on a lower surface of the exterior case, and the fan sandwiches the modulation system and the color synthesizing optical system to sandwich the exterior. A projection display device, characterized in that the projection display device is arranged in the upper part of the case. The projection display device according to any one of claims 4] claims 1 to 3, a projection display device characterized by extending the fan along the direction of the circuit board is located . 5. The projection display device according to claim 4, wherein the circuit board faces a blowing surface of the fan.