JP2001209126A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform efficient cooling and also to prevent dust or the like from entering from outside. SOLUTION: In the optical unit 9 of a projection display device 1, the inside space of a part thereof is substantially in a hermetical state by light guides 901 and 902, an upper sealing plate 991, a lower sealing plate 1150 and a head plate 903. An air circulating flow 1180 circulating up and down is formed by a circulating fan 15B arranged between liquid crystal light valves 925R, 925G and 925B and the lower sealing plate 1150 at the inside space. Heat radiation in the air circulating flow 1180 circulating up and down is performed on the side of outdoor air introduced to the upper surface of the upper sealing plate 991 while flowing along the lower surface, and also the heat radiation to outside is performed while passing through air paths 1160 and 1170 passing the air hole of the head plate 903 through heat-radiating parts 5R and 5L formed at a front case. Each part at inside is efficiently cooled by the air circulating flow 1180 sufficiently cooled. Also, the dust or the like is prevented from entering from the outside because it is a circulating flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention decomposes a light beam from a light source into three color light beams of red, blue and green, and makes each of these color light beams correspond to video information through a light valve composed of a liquid crystal panel. The present invention relates to a projection display device that modulates, modulates, modulates, modulates light beams of respective colors, and magnifies and projects the modulated light beams on a screen via a projection lens. More specifically, the present invention relates to a cooling mechanism for efficiently cooling a heat generating portion of such a projection display device.

[0002]

2. Description of the Related Art A projection display apparatus basically includes a light source lamp unit, an optical unit for optically processing a light beam emitted from the light source unit so as to synthesize a color image corresponding to video information, and a light source lamp unit. A projection lens unit that projects the luminous flux synthesized in the above on a screen, a power supply unit,
A circuit board group on which a control circuit and the like are mounted is provided.

[0003] 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, a group of input / output terminals for transmitting and receiving signals to and from the outside, and the like are arranged on the surface of the outer case.

[0004] 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, outside air is introduced from an intake port of an outer case using an intake fan, and the outside air flows through an internal heat source to cool them. After cooling each part, the outside air introduced into the inside is discharged to the outside again through an exhaust port opened in the outer case by an exhaust fan.

The heat source includes each optical element constituting the optical unit. In particular, liquid crystal light valves,
Since a polarizing plate or the like absorbs a part of the transmitted light, it needs to be sufficiently cooled so as not to be overheated. Therefore, a part of the outside air introduced into the apparatus is made to flow to the heat generating part of the optical unit, and these parts are also cooled.

However, when air is introduced from outside, there is a possibility that dust and the like may enter the inside of the apparatus together. Of course, an air filter or the like is disposed at the intake port to capture dust and filter the intake air, but fine dust and the like may still enter the inside of the apparatus. If dust or the like enters the inside of the apparatus together with outside air and passes through the surface of the optical element in the optical unit, they may adhere to the surface of the optical element. If the dust adheres, the dust causes the enlarged projected dust to appear, or the image of the dusty portion is blurred or the like, thereby significantly lowering the image quality. Therefore, it is necessary to cool each optical element in the optical unit in a state where dust or the like does not enter.

However, no mechanism has conventionally been proposed which has a dustproof function and can efficiently cool each optical element in the optical unit.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to propose a projection type display device having a cooling mechanism capable of efficiently cooling each part in an optical unit without intrusion of dust or the like. It is in.

[0009]

In order to solve the above-mentioned problems, the present invention provides a light source lamp unit and optical processing of a light beam emitted therefrom to form an optical image corresponding to image information. In a projection display device having an optical unit and a projection lens unit that enlarges and projects an optical image formed here on a screen, a light guide that defines an outer peripheral surface of the optical unit, an upper surface of the optical unit, An upper sealing plate attached to the lower surface and the front surface,
Using a lower sealing plate and a head slope, at least a part of the inside of the optical unit is partitioned into a substantially airtight internal space, in which a circulating air flow circulating vertically, for example. Arrange a circulation fan to form a
The circulating airflow cools the optical element located in the internal space.

In the present invention, a portion in the optical unit where a heat source such as a liquid crystal light valve is disposed is substantially airtight. In this interior space, a circulating air flow is forcibly formed, which cools the parts. Therefore, unlike the conventional case of cooling using air introduced from outside, cooling is performed in a state in which dust and the like do not substantially enter from outside. Therefore, dust and the like do not adhere to the surface of the optical element such as the light valve.

In general, a liquid crystal light valve is the largest heat source among the optical elements constituting the optical unit. Therefore, by arranging a circulation fan below this part and blowing the air circulation flow directly to the liquid crystal light valve, efficient cooling can be realized.

Here, further, outside air introducing means for introducing outside air and an intake passage for flowing the introduced outside air along the outer peripheral surface of a member defining an airtight internal space are arranged, It is preferable that heat is exchanged between a circulating air flow formed in the internal space of the optical unit and the outside air flowing through the intake passage. For example, an intake passage may be formed along the upper surface of the upper sealing plate, and heat may be exchanged between the circulating air flow and the outside air via the upper sealing plate to cool the circulating air flow.

Further, by circulating at least a part of the circulating air flow formed in the internal space of the optical unit through an air passage whose outer surface is exposed to the outside,
It is preferable that heat can be exchanged between the air flow and the outside air. It is preferable that a large number of radiating fins are formed in a portion where the outer surface of such an air passage is exposed to the outside in order to enhance heat radiation efficiency.

As described above, in the present invention, the air flow circulating in the inside exchanges heat with the outside air flowing along the outer surface of the portion defining the outer peripheral surface of the optical unit such as the upper sealing plate. Is performed and heat is released. Alternatively, heat is released to the outside through the circulating air flow through an air passage whose outer surface is exposed to the outside. Therefore,
The heat radiation from the circulating air flow is efficiently performed. As a result, the inside of the optical unit is efficiently cooled by the circulating air flow.

If an integrator lens, which is a uniform illumination optical element, is used, the amount of heat generated by a liquid crystal light valve or the like can be suppressed. Therefore, cooling can be performed more efficiently.

In one embodiment of the present invention, the above internal space is formed by a dust-proof box surrounding at least a part of the optical elements included in the optical unit in a substantially airtight state. are doing. Also in this case, the optical element housed in the dustproof box is a liquid crystal light valve or the like that generates a large amount of heat.

When a sealed space is formed inside the optical unit by using a dust-proof box, an opening is formed in a side wall of the dust-proof box to allow a light beam directed to a liquid crystal light valve disposed therein to pass therethrough. There is a need.
By attaching a polarizing plate to the opening from the inside of the dustproof box, the inside of the dustproof box can be kept airtight.

Further, it is preferable that the circulating air flow formed in the dustproof box flows along the surface of the liquid crystal light valve or the like. Furthermore, if an outside air introducing means for introducing outside air is arranged right above the dustproof box, and an intake passage for flowing the outside air introduced by the outside air introducing means along the outer peripheral surface of the dustproof box is formed, the dustproof box is provided. Heat is exchanged between the circulating airflow formed in the inside and the outside air flowing through the intake passage, so that the inside of the dustproof box is efficiently cooled. Furthermore, if an air recirculation duct for returning the air blown out from the circulation fan to the circulation fan is disposed and the outer peripheral surface of the air recirculation duct is used as a heat dissipation surface, dust can be more efficiently prevented. The inside of the box can be cooled.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a projection type display device according to an embodiment of the present invention will be described with reference to the drawings.

(Overall Configuration) FIG. 1 shows the appearance of the projection type display device of this embodiment. The projection display device 1 has a flat rectangular parallelepiped shape as a whole, and is covered by the outer case 2. 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. The front end portion of the projection lens unit 6 projects from the center of the front case 5.

FIG. 2 shows an arrangement relationship of components built in the projection display device 1. A power supply unit 7 is disposed at the rear end inside the outer case 2. A light source lamp unit 8 and an optical unit 9 are disposed at a position adjacent to the front side of the apparatus. The base end side of the projection lens unit 6 is located at the front center of the optical unit 9.

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 the interface board 11, a video signal processing circuit is mounted. A substrate 12 is provided. 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 arranged at the left and right corners on the front end side of the device, respectively.

A cooling intake fan 15A is arranged at the center on the upper surface side of the optical unit 9, and a circulation fan 15B for forming a cooling air circulation flow is arranged at the center on the bottom surface side of the optical unit 9. ing. An exhaust fan 16 is disposed on the side of the apparatus, which is the back side of the light source lamp unit 8. Then, the substrate 11 in the power supply unit 7,
An auxiliary cooling fan 17 for sucking the cooling airflow from the intake fan 15 </ b> A into the power supply unit 7 is arranged at a position facing the end of 12.

Further, a floppy (registered trademark) disk drive unit (FDD) 18 is disposed immediately above the power supply unit 7 at a position on the left side of the apparatus.

(Structure of Outer Case) As shown in FIG.
The upper case 3 of the outer case 2 has a rectangular top wall 3a.
And left and right side walls 3b, 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 6 is formed. Of the front end of the device extends forward of the apparatus. The upper case 3 and the lower case 4 are mutually connected by fixing screws 21a, 21b and 22a, 22b at two positions on the left and right side walls, respectively. The front case 5 is held between the upper case 3 and the lower case 4 from above and below.

An air filter cover 23 is attached to the top wall 3a of the upper case 3 at a position on the center front side. A large number of ventilation holes are formed in the cover 23, and an air filter 24 is mounted inside the cover 23 so that dust and the like do not enter from outside through the air holes (FIG. 2 (b)). )reference). The intake fan 15A is located on the back side. At the left and right ends on the front side of the ceiling wall 3a, a large number of communication holes 25R and 25L are formed at positions corresponding to the built-in speakers 14R and 14L. An operation switch cover 26 is attached to a left end portion of the top wall 3a. This operation switch cover 2
6 can be opened and closed about one end thereof. When the lid 26 is opened, a number of operation switches (not shown) arranged inside are exposed.

A lamp replacement lid 27 is attached to 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 and the lid 27 can be removed and the built-in light source lamp unit 8 can be replaced if you like.

Height adjusting feet 31R and 31L are disposed at the left and right corners of the front end of the bottom wall 4a. The height of these feet 31R and 31L can be finely adjusted by turning them. Further, by operating the height adjustment buttons 32R and 32L (only the button 32L is shown in the figure) protruding from the lower part of both ends of the front case 5,
The heights of these feet 31R and 31L can be roughly adjusted (coarse adjustment).

A projection 33 is formed at the center of the rear end example of the bottom wall 4a. The projection 33 and the two feet 3
The apparatus 1 is set on a table or the like while being supported at three points. Auxiliary projections 34R and 34L are also formed at both ends on the rear end side of the bottom wall so that the apparatus does not rattle when the installation surface has irregularities.

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. Since the light receiving windows are formed on both the front side and the rear side of the apparatus, remote control can be performed from either the front side or the rear side of the apparatus, which is convenient. Further, heat radiating portions 5R and 5L in which a large number of heat radiating fins are exposed are formed in the front case 5 at the left and right positions of the central projection lens unit 6 in the vertical direction. These heat radiating portions are for releasing heat from the air flow circulating in the optical unit to the outside, as described later.

An AC inlet 36 for external power supply and a main power switch 37 are provided at the left end of the rear wall 4d, which defines the lower half of the rear surface of the device.
Is arranged.

As shown in FIG. 1A, a portable handle 38 is mounted on the left side of the apparatus. The two base end portions 38a, 38b of the handle 38 are rotatably mounted on the mating surfaces of the upper case 3 and the side walls 3b, 4b of the lower case 4. A recess 3e for storing a handle is formed in the side wall 3b on the upper case side, 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 left side wall 4b on the lower case side. When this is opened, many input / output terminals (not shown) arranged inside are exposed.

Further, in the upper case side wall 3b on the left side of the apparatus, a floppy disk insertion port 18a is opened in a horizontal state at a position near the rear top wall 3a. An eject button 1 is located at the upper right of the insertion slot 18a.
8b are arranged.

The side wall 3 of the upper case and the lower case defining the opposite side of the device, that is, the right side.
c, 4c are provided with the exhaust holes 43
Are formed. 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. The lamp housing 802 is
Inner housing 803 and outer housing 804
It has a double structure. The light source lamp 801 includes a lamp main body 805 such as a halogen lamp and a reflector 806.
The light is emitted toward the optical unit 9 along a.

The outer housing 804 has an opening at the front surface in the direction of the optical axis 1a, and an ultraviolet filter 809 is attached thereto. On the back surface in the direction of the optical axis 1a,
A large number of slit groups 807 for passing cooling air are formed. The inner housing 803 includes a light source lamp 801.
Is provided at the front surface, and the portion through which the emitted light passes is an opening, and the outer peripheral portion is provided with a cooling air passage hole 8.
08 are formed in large numbers. 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 these are integrated.

(Optical Unit) As shown in FIG. 3A, the optical unit 9 includes a prism unit 910, a liquid crystal light valve 925R,
Optical elements other than 925G and 925B are held between upper and lower light guides 901 and 902 from above and below. The upper light guide 901 and the lower light guide 902 are fixed to the upper case 3 and the lower case 4 by fixing screws, respectively. Also,
It is also fixed to the prism unit 910 side by a fixing screw.

The prism unit 910 is fixed to the back side of a thick head plate 903, which is a die-cast plate, with fixing screws. On the front of this head slope 903,
The base end side of the projection lens unit 6 is similarly fixed by a fixing screw. Therefore, in this example, the head plate 9
The prism unit 910 and the projection lens unit 6 are fixed so as to be integrated with the lens unit 03 interposed therebetween. Both units are integrated with the highly rigid head plate 903 interposed therebetween. Therefore, even if an impact or the like acts on the projection / reset unit 6, the optical axis is hardly displaced between these two units.

(Optical System) FIG. 6 shows only the optical system of the projection display device 1. The optical system includes the light source lamp 8 described above.
05, an illumination optical system 923 including integrator lenses 921 and 922, which are uniform illumination optical elements, and a polarization conversion element disposed adjacent to the Ishigator lens 922, and a light beam emitted from the illumination optical system 923. W
, A color separation optical system 924 that separates the light into red, green, and blue light fluxes R, G, and B, and three liquid crystal light valves 925R, 925G, and 92 serving as light valves that modulate each light flux.
5B, a prism unit 910 as a color synthesizing optical system for synthesizing the modulated color light beam, and a projection lens unit 6 for enlarging and projecting the synthesized light beam on a screen. Further, of the respective color light beams separated by the color separation optical system 924, the blue light beam B is set to the corresponding liquid crystal valve 925.
A light guide system 927 for guiding B is provided.

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, 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 9.
42 and a reflection mirror 943. The luminous flux W is
First, in the blue-green reflecting dichroic mirror 941,
The blue light beam B and the green light beam G contained therein are reflected at a right angle, and travel toward the green reflection ditalic mirror 942. The red light flux R passes through this mirror 941,
The light is reflected at a right angle by the rear reflecting mirror 943, and is emitted from the emission part 944 of the red light beam toward the prism unit 910.

Of the blue and green luminous fluxes B and G reflected by the mirror 941, the green luminous flux G is reflected at a right angle by the green reflection dichroic mirror 942 to emit the green luminous flux.
The light is emitted from 45 toward the color combining optical system. The other blue light flux B passes through the mirror 942 and exits from the blue light flux 9.
The light is emitted from the light guiding system side. In this example, the distances from the light emitting portion of the uniform illumination optical element to the light emitting portions 944, 945, 946 of the respective color light beams in the color separation optical system 924 are all set to be equal.

The emission section 9 of each color light beam of the color separation optical system 924
Condensing lenses 951, 952, and 953 are disposed on the exit sides of the light emitting devices 44, 945, and 946, respectively. Therefore, each color light beam emitted from each emission unit is incident on these condenser lenses 951, 952, and 953 and is converted into a parallel light beam.

The red and green luminous fluxes R and G among the parallel luminous fluxes R, G and B are the polarizing plates 981 and 9 respectively.
The liquid crystal light valve 9
The light is modulated by being incident on 25R and 925G, 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. As such a driving means, a known means can be used as it is. On the other hand, blue light flux B
Is guided to the corresponding liquid crystal light valve 925B via the light guide system 927 and the polarizing plate 983, where
Similarly, modulation is performed 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 9 includes an incident side reflection mirror 971,
It comprises an emission side reflection mirror 972, an intermediate lens 973 arranged between them, and a condenser lens 953 arranged 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 927
The loss of the light amount can be suppressed by interposing.

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

Here, in addition to the above configuration, it is preferable that the light flux of each color is aligned with S-polarized light. When only S-polarized light can be used, 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. The light guide system 927 reflects a light beam using a mirror.
Since the polarization of the polarized light is higher than that of the P-polarized light, there is also obtained an advantage that the light amount loss and the like can be suppressed.

(Power Supply Unit) As shown in FIG. 2, the power supply unit 7 has its constituent elements arranged inside a metal shield case 701, and electric and magnetic noise generated in this unit leaks outside. Is preventing that.
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 side of the apparatus with a constant width. That is, the optical system block 9 is located in front of the protruding portion 702.
The reflection mirror 931 of the uniform illumination system is arranged at an angle of 45 degrees with respect to the front-rear direction of the apparatus. The space on the back side tends to be a dead space. In this example, in order to effectively use the space 703, the shield case 701 is protruded toward the space 703 to form a protruding portion 702, thereby securing a space for arranging the 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 similarly fixed to the upper wall 3a of the upper case 3 by a plurality of fixing screws. As described above, since the upper case 3 and the lower case 4 are fixed to the highly rigid shield case 701 on the rear end side of the apparatus, the outer case at the rear end of the apparatus has high integrity and high rigidity. Has become.

The power supply unit 7 is heavier than other parts arranged in the apparatus. Heavy parts in the device
In addition to the power supply unit 7, the prism unit 910 fixed before and after the head plate 903 and the projection lens unit 6
It is. In this example, as can be clearly understood from FIG. 2, the power supply unit 7 is arranged in a horizontally long state at the rear end of the apparatus. Further, by appropriately setting the arrangement of the components of the power supply unit 7, 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 apparatus is located substantially at the center of the apparatus in the width direction and the front-back direction. As a result, the portable handle 38 is pulled out, and FIG.
Even if the device is accidentally dropped while carrying the device with the left side of the device facing upward as shown in FIG.
Since the center is located at the center of the front, rear, left and right, it falls in the posture.

If the position of the center of gravity of the apparatus is in a position shifted to the front or rear or left and right, the apparatus 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 the possibility that local damage occurs is extremely low. 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, as can be seen from FIG. 2B, the fixing screw 704 is also located at a position corresponding to the position of the center of gravity of the power supply unit 7 in the vertical direction of the device.
Thus, it is fixed to the outer case 2 side. In this example, it is fixed to the rear wall 4d of the lower case. As a result, it is possible to effectively prevent the power supply unit 7 from swinging back and forth when vibration is applied to the device in the front and rear direction.

On the other hand, in the power supply unit 7 of the present embodiment, the power supply path from the power supply unit to each drive portion is made as short as possible, so that the lead wire, which is a noise generation source, is made as short as possible. The occurrence of is suppressed. First,
The AC inlet 36 and the main power switch 37 are 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 part 711 of this switch 710 points downward. The operating portion 711 is constantly pushed upward by an operating protrusion 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 switched to the off state. As described above, the switch 710 which has conventionally been located away from the power supply unit 7 is replaced with the shield case 7 of the power supply unit.
No. 01 is fixed to the side surface, and the lead wire up to that side is shortened.

Further, in the power supply unit 7 of this embodiment, a ballast circuit portion 720 which is a drive circuit of the lamp unit 8 disposed adjacent to the front side of the apparatus is disposed 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 example, the power supply path drawn from the power supply unit 7 and reaching each drive portion is made as short as possible. Therefore, the amount of noise generation can be reduced as compared with the related art.

(FD Driving Unit) In this example, as described above, the FD drive unit is mounted on the upper surface of the power supply unit 7 mounted in a state where the impact resistance and the drop resistance are improved.
The drive unit 18 is fixed by a fixing screw or the like. In the projection display device, the optical system portion of the internal components is not firmly covered by a shield case or the like. Therefore, in order to attach the FD drive unit 18 to such an optical system, a separate
It is necessary to arrange a reinforcing member or the like for attachment. But,
The power supply unit 7 and the light source lamp unit 8 are covered by the case as described above, and the upper surface thereof is generally formed with a flat portion. In this example, this flat part
The FD drive unit 18 is fixed. Therefore, FD
The unit 18 can be installed without requiring a separate member for fixing the drive unit 18, a reinforcing member, and the like.

Further, when the FD drive unit 18 is mounted on the upper surfaces of the power supply unit 7 and the light source lamp unit 8, there is an advantage that these shield cases can be used as electric ground as they are.

Further, in this example, the FD drive unit 18
Are arranged on the upper surface of the power supply unit 7 at a position close to the left side surface. The reason is that the FD insertion port 18a of the unit 18 is connected to the left side wall 3b of the apparatus exterior case.
It is because it is located in. On the left side wall 3b, an operation switch group is arranged on the top wall side, and on the bottom wall side, an input / output unit for inputting / outputting an external device is arranged. Have been. Therefore, if the FD insertion port 18a is arranged at this position, all operations of the apparatus 1 including the FD insertion and ejection operations can be performed.
It can be done on the left side 3b of the device,
It becomes convenient.

(Arrangement of Substrates) FIGS. 15, 16 and 1
7, the interface board 11 and the video board 1
2 and control board 13, and FD drive unit 18
The arrangement of the drive board 19 on which the drive control circuit is mounted will be described.

First, as shown in FIG.
Are arranged in parallel with the lower case 3 at the lower position of the upper wall 3a, and a plurality of locations on the outer peripheral edge are fixed to the upper case 3 side by fixing screws. The substrate 13 has a shape that covers the upper surfaces of the optical system block 9 and the light source lamp unit 8. The upper portion of the prism unit 910 has a rectangular shape. At the left end of the device of the substrate 13, contacts corresponding to the operation switches 26a arranged at the left end of the top surface of the device are arranged.

As can be seen from FIG. 17, the interface board 11 is arranged in parallel at a position slightly higher than the bottom wall 4a of the lower case 4. Further, the video board 12 is arranged in parallel with the side wall on the left side of the apparatus in a posture standing upright in the apparatus 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. A shield plate 112 is attached to an upper end of the board fixing bracket 111, and an upper end side of the shield plate 112 extends to an 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 fixture 111 therebetween.
Therefore, it is possible to prevent noise generated from the electric element and the electronic element disposed therebetween from leaking to the outside.

On the other hand, the driving substrate 19 is disposed at a position adjacent to the FD driving unit 18 on the right side of the apparatus. The driving board 19 is arranged on the back side of the ceiling 3a in parallel with the front wall 3a and has a front portion 19a.
Is in a state of partially overlapping the rear end portion 13a of the control board 13.

Here, 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 arranged on the lower surface of the video board 12. Similarly, a connector 115 with the control board 13 is arranged on the upper surface of the video board 12. On the back surface of the control board 13, a connector 116 that can be inserted and connected to the connector 115 is arranged. Therefore, as shown in FIG.
In the state where 3 is arranged, the corresponding connectors are connected to each other.

The rear end portion 13a of the control board 13
The front side portion 19a of the driving board arranged in an overlapping state is also electrically connected to each other through a connector 117 which can be inserted into each other.

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

Further, in this example, as can be seen from FIG. 15, the corner of the outer peripheral edge of the control board 13 is fixed to the outer case 2 side, that is, the ground side, by using fixing screws. Such corner portions are portions where noise is likely to occur. However, if such a portion is grounded as in the present example, generation of noise can be suppressed.

(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. As shown in FIG. 15, the vertical wall 91 is a wall with high out-of-plane rigidity having a large number of reinforcing ribs 91 a formed on the surface in vertical and horizontal directions. A rectangular opening 91b through which light emitted from the prism unit 910 passes is formed in the center portion. The vertical wall 91 has a screw hole 91c for fixing the prism unit and a screw hole 91d for fixing the base end side of the projection lens unit 6. 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, the prism unit 910 and the projection lens unit 6 are fixed with the rigid vertical wall 91 sandwiched therebetween and aligned. Therefore,
The unity of these units is high, and even if an impact force or the like is applied, there is very little possibility that mutual displacement will occur.

The circulation fan 15B is mounted on the back surface of the bottom wall 92 of the head plate 903. The bottom wall 92 has a communication hole (not shown) through which cooling air flows.
Are formed.

Here, as can be seen from FIGS. 2 (b) and 4 (a), 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, the upper case 3 and the lower case 4 have their rear ends fixed to the power supply unit 7 and their front ends fixed to the head plate 903. Since the upper case 3 and the lower case 4 are fixed to portions having high rigidity in the front and rear, their unity and rigidity are high. Therefore, impact resistance is improved,
It is less likely to be damaged by dropping.

(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.

FIG. 8 shows a planar path of a basic flow of cooling air formed inside the projection display device 1. By the cooling suction fan 15A, the outside air is sucked into the inside of the apparatus 1 through the ventilation holes 23 formed in the top wall 3a of the apparatus 1. The introduced air flows laterally through the space (intake passage) between the upper sealing plate 991 defining the upper surface of the optical unit 9 and the top wall 3a of the apparatus, and is arranged on the right side of the apparatus. The air is exhausted again by the exhaust fan 16.

As shown by the bold line in FIG. 8, the main air flow distribution path is partially
When viewed in a plan view, the air directly reaches the exhaust fan 16 along the upper surface of the upper sealing plate 991 disposed above the optical unit, passes therethrough, and is discharged to the outside.

Another air flow 1120 flows rearward along the upper sealing plate 991 disposed above the optical unit 9, and is formed in the outer housing 804 from the front side of the light source lamp unit 8. Ventilation holes 804
a, and through the vent hole 808 formed in the inner housing 803. 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 air flow 1130
Flows toward the rear side along the upper surface of the optical unit 9, is sucked by the auxiliary suction fan 17 attached to the end of the power supply unit 7, is drawn into the power supply unit 7, passes through the inside, and passes through the inside. The air is sucked from the end by the exhaust fan 16 and discharged to the outside.

<Cooling of Power Supply Unit> FIG. 9 shows a three-dimensional flow of a flow path of an air flow 1130 passing through the inside of the power supply unit 7. After being sucked from the outside by the suction fan 15A, the airflow 1130 flows rearward along the upper sealing plate 991 arranged above the optical unit 9.

Next, through an air hole (not shown) opened in the upper light guide 901, the portion of the optical unit 9 where the integrator lenses 921 and 922, which are uniform illumination optical elements, are disposed is lowered. Thereafter, the light goes around from the air hole opened in the lower light guide 902 to the lower side. Then, the air is introduced into the power supply unit 7 through the suction fan 17. Finally, the air flows toward the exhaust fan 16 and is discharged to the outside through the exhaust fan 16.

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

<Cooling of Light Source Lamp Unit> FIG.
Air flow 1120 flowing through light source lamp unit 8
The three-dimensional flow of is shown. The air flow 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 exhaust fan 16 on the rear side. 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, the air flow 1120 from the front end of the light source lamp unit 8 to the rear along the optical axis 1a.
Is formed. Therefore, the surroundings of the heat source such as the lamp 805 and the reflector 806 are efficiently cooled.

<Cooling of Optical Unit> FIGS. 9 and 10
The cooling mechanism of each optical element inside the optical unit 9 will be described mainly with reference to FIG. The optical unit 9 is surrounded by an upper light guide 901 and a lower light guide 902. That is, the upper light guide 901 has a flat top wall portion shown in FIG. 3A and an upper half portion of the side wall extending substantially vertically downward from the periphery of the top wall portion.
Similarly, the lower light guide 902 also includes a bottom wall portion and a lower half portion of the side wall that stands substantially vertically upward from the periphery of the bottom wall portion. These light guides 9
01 and 902 are overlapped from above and below. As described above, the upper part of the upper light guide 901 above the prism unit 910 is notched.

The upper light guide 901 has an upper sealing plate 9
91 are attached. The upper surface of the optical unit 9 is sealed by the upper sealing plate 991 so as to be substantially airtight. However, the ventilation portion for passing the airflow 1130 toward the power supply unit 7 is formed as described above. This ventilation part is used for the uniform illumination optical system 9.
The upper light guide 901 is located just above the light guide 23.

Also, on the lower side of the optical unit 9,
A lower sealing plate 11 is provided below the lower light guide 902.
50 are attached.

The lower sealing plate 1150 is attached so as to surround the circulation fan 15B attached to the lower light guide 902 immediately below the prism unit 910 from below. Therefore, in this example, the lower side of the optical unit 9 is also sealed so as to be substantially airtight.

The front portions of these upper and lower sealing plates are fixed to the head plate 903. The rear sides of these plates are fixed to the upper and lower surfaces of the upper light guide 901 and the lower light guide 902, respectively.

In addition to this, the front side of the head plate 903 has a projection lens unit 8 attached at the center thereof.
And substantially airtight air circulation passages 1160, 1170 extending vertically along the inner surface of the front case 5.
Are formed between the sealing slopes 1161 and 1171 and the inner surface of the front case 5. These circulation paths 1160, 1
The heat radiating portions 5R and 5L are formed in the portion of the front case 5 where 170 is located. The head plate 903 has an internal space of the optical unit 9 and the air circulation path 116.
A large number of ventilation holes 9031 and 9032 are formed for communicating with the upper ends of 0 and 1170, respectively.

As described above, in this example, the internal space of the optical unit 9 is partitioned so as to be substantially airtight. That is, the upper light guide 901 and the lower light guide 902 covering the outer periphery of the optical unit 9, and the upper sealing plate 991 attached above the upper light guide 901.
, The lower sealing plate 992 attached to the lower side of the lower light guide 902, and the head slope 903, the optical unit 9 is made substantially airtight.

The circulation fan 15 disposed below the airtight space defined by each of these members
When B is driven, as shown in FIGS. 9 and 10, it goes upward along the front and rear surfaces of each light valve, and then passes through the circulation paths 1160 and 1170, and again, the fan 15B.
The air circulation flow 1180 returning to the suction side is formed. The air circulation flow 1180 cools optical elements such as light bubbles and polarizing plates during the ascending process. It rises and flows laterally along the upper sealing plate 991.

Immediately above the upper sealing plate 991, the intake fan 15
A is arranged, and outside air is introduced through this,
It is sprayed on the upper surface of the upper sealing plate 991. Therefore, the air circulating flow 1180 flowing laterally below the upper sealing plate 991 while flowing along the upper sealing plate 991 flows upward through the sealing plate 991. Heat exchange takes place between the flowing external air flow and cooling.

Further, in the process of descending through the circulation paths 1160 and 1170, heat is radiated to the outside through the heat radiating portions 5R and 5L formed in the front case 5.
Therefore, the circulating air flow is efficiently and sufficiently cooled. Therefore, the inside of the optical lens unit can be efficiently cooled.

As described above, in the present embodiment, in order to cool the inside of the optical unit 9, a circulating flow is formed inside without introducing air from the outside, thereby performing cooling. When cooling is performed by introducing an air flow from the outside, dust or the like enters the optical unit 9 from the outside and adheres to the surface of the optical element, which causes a problem such as blurring of a projected image. May occur. However, in this example, since the cooling is performed by the circulating flow, such an adverse effect does not occur. That is, according to this example, in the projection display device, it is possible to realize a cooling structure having a dustproof structure suitable for cooling the optical unit.

Further, by using the integrator lens, the light guide to the opening of the light valve is made uniform at the center and the periphery, and the light quantity at the center is reduced to 1/3.
Since it can be reduced to 1/5, it is possible to perform cooling more efficiently by combining with this cooling method. In addition, by polarizing the wavelength oscillation direction by the polarization conversion element and aligning it in one direction, heat generation of the polarizing plate can be halved, and dust-proof cooling can be easily realized.

In this example, the air inlet 2 is located directly above the upper sealing plate 991, that is, on the top wall 3a of the outer case of the apparatus.
3 is opened and the outside air is blown against the upper sealing plate 991 to cool the circulating air flow 1180 therethrough. Instead, the lower sealing plate 1150 side, that is,
An intake port may be formed in the bottom wall to cool off the circulating intake flow 1180 via the lower sealing plate 1150. Furthermore, the internal circulating airflow 1180 may be cooled by passing outside air along a part of the light guide that defines the outer peripheral side surface of the optical unit.

The circulation passages 1160 and 1170 in which the heat radiating portions 5R and 5L are formed are formed between the left and right side surfaces of the optical unit 9 and the corresponding outer case instead of being formed between the head plate 903 and the front case 5. It may be formed between the side walls 3b and 3c, and the heat radiating portion may be arranged on these outer case side walls.

<Modification of Cooling Mechanism of Optical Unit> FIG.
FIGS. 1 to 14 show another example of the cooling mechanism of the optical unit 9. In the following description, only different parts will be described. The same parts will be described using the numbers assigned to the respective parts shown in FIGS.

The cooling mechanisms shown in these figures are provided with the light valves 925R, 9
25G, 925B and the portions of the polarizing plates 981, 982, 983 can be efficiently cooled.

For this purpose, of the optical elements constituting the optical unit 9, the prism unit 910 and the light valves 925R, 925 facing the three incident surfaces thereof are provided.
25G, 925B and each polarization slope 981, 982, 983
Are housed in a substantially airtight box.
In addition, a circulation fan 15B is arranged in an airtight box to form a circulating air flow for cooling in the box.

More specifically, the prism unit 91 will be described.
0, each light valve 925R, 925G, 925B facing the three incident surfaces, and each polarizing plate 981, 9
Numerals 82 and 983 denote a dustproof box 1500 having a rectangular parallelepiped shape large enough to include these optical elements, and a head plate 9.
03 vertical wall portions. The dustproof box 1500 extends vertically through a portion of the horizontal wall of the head plate 903. The three sides of the dust-proof box 1500 on the light incident side have rectangular openings 150, respectively.
1, 1502 and 1503 are open. Each of these openings 1501 to 1503 is sealed so as to be airtight by each of the polarizing plates 981 to 983 attached to and fixed to the side wall from the inside thereof. Dustproof box 150
The side surface on the light emission side of No. 0 is open, and this portion is attached to the vertical wall portion of the head plate 903, and a rectangular parallelepiped storage space is defined as a whole.

Inside the dustproof box 1500, a horizontal partition plate 1510 is formed at a position below the dustproof box 1500.
The prism unit 910 is supported on the partition plate 1510. A circulation fan 15B is arranged in a space below the partition plate 1510. The air blowing side of the circulation fan 15B faces the partition plate 1510 side. In the partition plate 1510, three openings 1511 for air circulation (only two openings are shown in the figure) are formed immediately below the light valves 925R, 925G, and 925B.

On the left and right sides of the front side of the dustproof box 1500, air recirculation ducts 1520 and 1530 are connected. These air return ducts 1520, 153
Numeral 0 is for returning the airflow blown out from the circulation fan 15B to the upper side of the prism unit 910 on the air suction side of the circulation fan 15B.

These air return ducts 1520, 15
30 has a symmetrical shape. One duct 15
20 will be described. The upper end side of the duct 1520 is provided with an upper horizontal duct portion 1521 connected to the upper end of the side wall 1505 of the dustproof box 1500. The upper horizontal duct portion 1521 extends horizontally from the side wall 1505 in the lateral direction of the apparatus, and its tip extends horizontally to the front side of the apparatus beyond the vertical wall portion of the head plate 903 toward the apparatus front side. At the tip of the upper horizontal duct portion 1521,
Vertical duct section 152 extending vertically toward the lower side of the device
2 are connected. Further, the vertical duct portion 1522
The lower horizontal duct portion 1523 is connected to a lower end of the lower horizontal duct portion 1523. The lower horizontal duct portion 1523 extends horizontally below the head plate 903 toward the rear of the apparatus, and
5B is connected to the portion of the dust-proof box 1500 in which the 5B is built.

The air recirculation duct 1530 on the other side has the same structure, and includes an upper horizontal duct portion 1531, a vertical duct portion 1532, and a lower horizontal duct portion 1533.

The intake fan 15A is located directly above the dustproof box 1500 having this configuration. The intake fan 15A has a support plate 1540 attached to the upper surface of the dustproof box 1500 and the upper light guide 901.
A cylindrical duct 1541 surrounding the air outlet 15a of the intake fan 15A is formed. Further, a cylindrical duct 1542 surrounding the duct 1541 is integrally formed on the back surface of the upper case. Furthermore, the intake fan 15A is arranged such that the air outlet 15a is located at a position, for example, about 5 mm away from the upper surface of the dustproof box 1500. In addition, the intake fan 1
5A may be attached and fixed to the upper case side.

On the other hand, the upper surface 155 of the dustproof box 1500
0 has a rectangular flat surface 1551, an inclined surface 1552 formed on the rear side of the device, and inclined surfaces 1553 and 1554 formed on the left and right of the flat surface 1551. These slopes 1552, 1553, 1554 are downwardly
It is inclined at an inclination angle of about 0 to 60 degrees.

Next, the distance between the side surface 1506 of the dustproof box 1500 on the rear side of the device and the front surface 9a of the optical unit 9 formed by the upper and lower light guides 901 and 902 opposed to this, for example, is approximately A gap 1560 of about 5 mm is formed. The upper end of the gap 1560 communicates with the air outlet of the cooling fan 15A. The lower end of the gap 1560 communicates with the gap 1561 between the lower light guide 902 of the optical lens block 9 and the lower case.

The connection between the dust-proof box 1500 and the return ducts 1520 and 1530, etc., is covered with a metal tape. Thereby, the airtightness of the dustproof box 1500 is further enhanced. A method of maintaining airtightness by using a cushion material may be employed.

[0110] The cooling mechanism of this configuration is a dustproof box 150.
0, and the circulation fan 15B is disposed below the zero. Therefore, when the circulation fan 15B is driven, the air blown out from the air outlet 15b passes through the opening 1511 of the partition plate 1510 and blows up to the prism unit 910 side. Then, the prism unit 910 and each light valve 925R, 925G,
925B, each light valve 925R, 925
G, 925B and corresponding polarizing plates 981, 982, 983
And flows upward through the gap.

Thereafter, a pair of air recirculation ducts 15
20, 1530, circulates, and the circulation fan 15
Return to the air suction side of B. Therefore, a circulating air flow is formed inside the dustproof box 1500 which is substantially airtight. In FIGS. 11 to 14, the circulation path of the circulating air flow is indicated by arrows.

As described above, the light valve and the polarizing plate, which are heat sources, are cooled by the circulating air flow. Therefore, since the air introduced from the outside is not used, dust and the like do not enter from the outside and adhere to the surface of the light valve, the prism unit and the like.

The polarizing plates 981, 982, 983 are
Side walls 1505, 1506, 15 of dustproof box 1500
07, and serves to close these openings. The air introduced from the intake fan 15A flows along the surface of the side wall of the dustproof box 1500. Therefore, each side wall is a polarizing plate 981, 982,
It functions as a heat sink of 983. Therefore, each polarized light sheet is efficiently cooled.

Further, the circulating air flow formed by the circulating fan 15B is supplied to the air recirculation ducts 1520 and 1520.
The flow returns to the circulation fan 15B via 30. While passing through these air return ducts 1520, 1530, the circulating airflow is cooled off. That is, the outer peripheral surface of each air circulation duct 1520, 1530 functions as a heat radiation surface,
The circulating air flow is efficiently cooled.

On the other hand, cylindrical ducts 1541 and 1542 are arranged around the intake fan 15A. Therefore, the introduced outside air is blown toward the upper surface of the dustproof box 1500 without being diffused. Therefore,
The immersion box 1500 can be efficiently cooled.

If an electric cooling means such as a Peltier element is arranged inside the top surface of the dustproof box together with the above cooling means, the cooling efficiency can be further improved.

[0117]

As described above, according to the present invention, the inside or a part of the optical unit is formed as a substantially airtight space, and a circulating air flow is formed therein by using a circulating fan. This circulating airflow cools the heat-generating portions such as the liquid crystal light valve.

Therefore, unlike the conventional system in which outside air is introduced into the optical unit and cooled, dust and oil smoke do not enter from the outside. Therefore, the inside of the optical unit can be efficiently cooled, as dust or the like adheres to the surface of the optical element and the image quality of the enlarged projected image deteriorates.

In particular, when heat is exchanged between the circulating air flow and the outside air introduced into the apparatus,
The circulating air flow can be efficiently and sufficiently cooled. Similarly, even when the circulating air flow is circulated through an air passage provided with a heat radiation portion directly exposed to the outside, the circulating air flow can be efficiently and sufficiently cooled. Therefore, if these configurations are adopted, a more efficient cooling operation can be realized.

Further, in the present invention, an integrator lens is used for the optical system. If an integrator lens is used, the light guide to the center of the liquid crystal light valve is reduced to 1/3.
This is suppressed to 1/5 or less, and the light amount is made uniform between the central portion and the peripheral portion. Therefore, the amount of heat generated in the liquid crystal light valve or the polarizing plate can be suppressed. Therefore, if the integrator lens is used in combination with the cooling method of the present invention, the liquid crystal light valve can be cooled very efficiently.

Further, when a polarization converting means for polarizing the wavelength components (P wave and S wave) of the illumination light in one direction is used together, the load on the polarizing plate mounted on the dustproof box can be reduced by half, and the outside air can be introduced. Dependence on quantity can be reduced.

Further, the dust-proof box can easily transmit the heat generated by the polarizing plate, and can effectively function as a heat radiating plate having a large area where the heat gradient is high. In addition, the cooling performance can be sufficiently guaranteed without considering a complicated structure such as liquid cooling. The use of an electric cooling means such as a Berteau element makes it possible to further increase the brightness, and also reduces the number of intake fans 15A and contributes to a reduction in the thickness of the product.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing an external shape of a projection display device according to an embodiment of the present invention, wherein FIG. 1A is a perspective view seen from the front side, FIG. (C) is a rear view.

FIGS. 2A and 2B are diagrams showing the arrangement of components arranged inside the apparatus of FIG. 1, wherein FIG. 2A is an explanatory diagram showing their planar positional relationship, and FIG. It is explanatory drawing which shows a relationship.

FIGS. 3A and 3B are views showing an optical unit and a projection lens unit, and FIG. 3A is a schematic plan configuration diagram and FIG. 3B is a schematic cross-sectional configuration diagram.

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

FIG. 5 is a side view showing a method of fixing the head plate, the projection lens unit, and the outer case.

FIG. 6 is a schematic configuration diagram of an optical system incorporated in the apparatus of FIG.

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 vertical flow of a cooling air flow.

FIG. 10 is an explanatory diagram showing a vertical flow of a cooling air flow.

FIG. 11 is a schematic configuration diagram showing a planar configuration of a cooling mechanism using a dust-proof box.

FIG. 12 is a schematic configuration diagram showing a cross-sectional configuration of a cooling mechanism using a dust-proof box.

FIG. 13 is a schematic configuration diagram showing a cross-sectional configuration of a portion cut along the line MM in FIG. 12;

FIG. 14 is a schematic configuration diagram showing a cross-sectional configuration of a portion cut along the line nn of FIG. 12;

FIG. 15 is an explanatory diagram showing a mounting position of a substrate in the apparatus of FIG. 1;

FIG. 16 is an explanatory diagram showing a mounting position of a substrate in the apparatus of FIG. 1;

FIG. 17 is an explanatory diagram showing a mounting position of a substrate in the apparatus of FIG. 1;

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/00 360 G09F 9/00 360Z H04N 5/64 501 H04N 5/64 501D 541 541J 5/74 5 / 74 K 9/31 9/31 BEF term (reference) 2H088 EA14 EA15 HA13 HA20 HA21 HA23 HA24 HA28 2H089 JA10 TA16 TA18 UA05 5C058 BA23 EA02 EA12 EA26 EA43 EA46 EA52 5C060 BA04 BA08 BC05 GA01 HC01 HC09 HD11 HC20 BB17 DD02 DD04 GG44 LL15

Claims (15)

[Claims] 1. A light source lamp unit, an optical unit for optically processing a light beam emitted from the light source lamp unit to form an optical image corresponding to video information, and enlarging and projecting the optical image formed here on a screen A projection lens unit, wherein at least a part of the inside of the optical unit is partitioned so as to be substantially airtight, and the inside of the inside space is inside the inside space. A circulating fan for forming a circulating air flow is arranged, and by the circulating air flow,
A projection display device, wherein an optical element located in the internal space is cooled. 2. The light guide according to claim 1, wherein the light guide defines an outer peripheral surface of the optical unit, and an upper sealing plate, a lower sealing plate, and a head plate attached to an upper surface, a lower surface, and a front surface of the optical unit, respectively. Wherein the internal space is partitioned so as to be substantially airtight. 3. The liquid crystal light valve according to claim 2, wherein a liquid crystal light valve, which is a component of the optical unit, is disposed in the internal space, and the circulating air flow is directed up and down along a surface of the liquid crystal light valve. A projection display device characterized by circulating in a circle. 4. The circulating fan according to claim 3, wherein an air outlet of the circulation fan is disposed below the liquid crystal light valve, and circulating air is blown upward from the air outlet. Projection type display device. 5. The air conditioner according to claim 1, further comprising: an outside air introduction unit for introducing outside air, and an intake passage for flowing the introduced outside air along at least a part of an outer peripheral surface of a member defining the internal space. A projection type display device, wherein heat exchange is possible between a circulating air flow formed in the internal space and outside air flowing through the intake passage. 6. The method according to claim 1, wherein at least a part of the circulating airflow formed in the internal space is circulated through an air passage whose outer surface is exposed to the outside.
A projection display device wherein heat exchange is possible between the airflow and the outside air. 7. The projection type display device according to claim 6, wherein a portion of the air passage whose outer surface is exposed to the outside is a heat radiating portion in which a large number of heat radiating fins are formed. 8. The method according to claim 1, wherein the internal space is formed by a dust-proof box surrounding at least a part of the optical elements included in the optical unit in a substantially airtight state. Characteristic projection display device. 9. The projection display device according to claim 8, wherein the optical elements housed in the dust-proof box are at least a liquid crystal light valve and a prism unit as a color synthesizing unit. 10. The dust-proof box according to claim 9, wherein an opening is formed in a side wall of the dust-proof box to allow a light beam incident on the liquid crystal light valve to pass therethrough, and the opening is a polarized light pasted from inside the dust-proof box. A projection display device, which is sealed by a plate. 11. The projection display according to claim 10, wherein said circulating air flow circulates vertically along the surfaces of said liquid crystal light valve, said prism unit and said polarizing plate. apparatus. 12. The dust-proof box according to claim 11, wherein the outside-air introduction means for introducing outside air disposed immediately above the dust-proof box, and the outside air introduced by the outside-air introduction means are transferred along the outer peripheral surface of the dust-proof box. A projection type display device having an intake passage for flowing therein, wherein heat can be exchanged between a circulating airflow formed in the dustproof box and outside air flowing through the intake passage. 13. The air circulation duct according to claim 12, further comprising an air circulation duct for returning the air blown from the circulation fan to the circulation fan, wherein an outer peripheral surface of the air circulation duct functions as a heat radiation surface. Projection type display device characterized by performing. 14. The projection display according to claim 1, further comprising an integrator lens as a uniform illumination optical element as the optical system. 15. The optical system according to claim 14, wherein:
Further, a projection display device is provided with polarization conversion means for aligning the polarization direction of the illumination light.