JP2001159783A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector equipped with a cooling structure capable of efficiently cooling an electrooptical device and coping with the high luminance of a light source lamp or the miniaturization of the device or the like. SOLUTION: An outside case 2 whose upper part is opened is provided with an air intake 240 on its upper surface, and the electrooptical device 925 is provided with a cooling fan 17 introducing cooling air from the air intake 240 to the inside of the device 1 on its upper part. There is no limit in the quantity of the introduced air, and the cooling air sufficient enough to cool the device 925 is easily made to blow to the device 925. Thus, the device 925 is efficiently cooled, and the cooling structure capable of coping with the high luminance of the light source lamp 181 or the miniaturization of the device 1 can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a projector provided with an electro-optical device for forming an optical image according to image information.

[0002]

2. Description of the Related Art Conventionally, a light source, an electro-optical device for forming a light beam emitted from the light source in accordance with image information, and a projection lens for enlarging and projecting an image formed by the electro-optical device are known. There is known a projector including an external case for storing these components.

Such projectors are used in conferences, conferences,
It is widely used for multimedia presentations at exhibitions and the like, and is sometimes brought in as necessary or moved to another place after the end, and thus, miniaturization is promoted.

Further, in order to sharpen an image projected by a projector, a light source lamp as a light source has been enhanced in luminance.

[0005] In such a projector with high brightness and miniaturization, the temperature inside the device easily rises.
It is necessary to efficiently cool heat-sensitive electro-optical devices.

For this purpose, an air inlet is formed on the lower surface of the outer case, and a cooling fan for introducing external air as cooling air from the air inlet is provided below the electro-optical device to cool the electro-optical device. ing.

[0007]

However, in the above-mentioned conventional projector, it is necessary to lower the center of gravity in order to secure the stability at the time of installation, and from the desk or the like on which the projector is installed to the lower surface of the outer case. The height dimension is reduced. Therefore, even if a large amount of cooling air is introduced from the lower surface of the projector with the cooling fan, the amount of air introduced from the gap is limited. However, there is a problem that cooling cannot be performed sufficiently.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a projector having a cooling structure capable of efficiently cooling an electro-optical device and increasing the brightness of a light source lamp and miniaturizing the device.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a projector comprising an electro-optical device for forming an optical image in accordance with image information, and an outer case for covering a main body including the electro-optical device. An air inlet for taking in external air as cooling air is formed on the upper surface of the case, and cooling air is introduced from the air inlet above the electro-optical device to cool the electro-optical device. Is provided.

According to the present invention, since the upper surface of the outer case is normally opened upward, an air inlet is provided on the upper surface, and the cooling air is provided above the electro-optical device from the air inlet. By providing a cooling fan for introducing the device into the device, it is possible to easily blow sufficient cooling air to the electro-optical device to cool the electro-optical device. As a result, the electro-optical device can be efficiently cooled, and a cooling structure that can cope with an increase in the brightness of the light source lamp and a reduction in the size of the device can be obtained.

In the above, the projector has a projection lens for enlarging and projecting an image formed by the electro-optical device. The projection lens includes a plurality of lenses arranged along a predetermined axis. Of the plurality of lenses, it is preferable that at least the lens disposed at the most proximal side with respect to the projection direction has a shape in which the upper end side is cut out.

Here, an electro-optical device is arranged near the base end side of the projection lens, and the center of the image forming area of the electro-optical device is aligned with the extension of the axis of the projection lens and the electro-optical device. If arranged below the intersection, the optical image from the electro-optical device is incident from below the axis,
The light passes through the projection lens and is projected so as to extend above the axis. Therefore, the optical image is enlarged and projected on the projection surface without any problem even if the upper end side of the lens disposed closest to the base end side in the projection direction is cut off.

Therefore, if the upper end side of the lens is cut out, the cooling fan provided above the electro-optical device may be arranged closer to the electro-optical device by the cut-out upper end side. It becomes possible. This makes it possible to introduce cooling air with a large wind force into the electro-optical device, so that the electro-optical device can be cooled more efficiently. Further, if the cooling fan is provided close to the electro-optical device, the height of the projector can be reduced, so that the projector can be reduced in size and thickness.

It is desirable that a light-shielding structure for preventing light leakage from the air intake be provided above the cooling fan.

In this way, it is possible to prevent light from leaking from the air inlet and to improve the image visibility of an observer who normally observes an image from behind the apparatus.

Further, in the above-mentioned light shielding structure, a plurality of plate-like members arranged in parallel across the air intake are arranged so that their surfaces form a predetermined angle with respect to the opening surface of the air intake. It is preferable to be configured in a louver shape. Specifically, the direction of the gap between the plate members is changed by inclining each plate member so as to descend toward the device rear side, or by inclining so as to decrease toward the front of the device. Therefore, it is possible to regulate the emission direction of the leak light. Here, if each plate-like member is inclined so as to descend toward the rear side of the apparatus, the leak light is emitted to the front of the apparatus, so that the leak light does not hit the eyes of the observer, This makes it possible to further improve the visibility of the image by a rear or side observer. That is, if the plurality of plate members are arranged so that their surfaces form a predetermined angle with respect to the opening surface of the air intake, almost no light leaks to the outside. In addition, it is possible to introduce cooling air to the cooling fan from the gap between the plate members. Therefore, if a plurality of plate-shaped members having a louver shape are employed as the light-shielding structure, light leakage can be prevented and cooling air can be introduced with the single light-shielding structure, thereby increasing the number of parts of the projector. From this point, the size of the projector can be reduced.

It is desirable that an exhaust port for exhausting the air inside the projector to the outside be provided on the front surface of the above-mentioned exterior case.

With this configuration, the air taken into the inside of the apparatus by the cooling fan can be exhausted to the front of the apparatus, so that the exhausted air is blown to the observer behind or to the side of the apparatus. There is no discomfort to the observer from this point.

Further, since the exhaust port is formed on the front surface of the outer case, light leakage from the exhaust port is not recognized by an observer behind or on the side of the apparatus, and the image visibility of the observer is reduced. It can be improved. In addition, if a light shielding structure for preventing light leakage from the exhaust port is provided in the exhaust port, light leakage from the exhaust port can be prevented.

Further, the above-described projector includes a projection lens for enlarging and projecting an image formed by the electro-optical device, and an optical component housing for housing the optical components. Are arranged in a plane U-shape having a concave portion, and the concave portion faces the front side of the outer case, and the concave portion supplies power to a drive circuit board for driving the electro-optical device. A power supply unit is arranged, and an exhaust port is taken in by the cooling fan, and a device fan for discharging the air cooled inside the projector to the outside of the projector, and the air heated by the power supply unit are independently formed. It is preferable that a power supply fan for exhausting air be provided.

Here, the power supply unit for supplying power to the drive circuit board and the like is heated, but since the power supply unit is surrounded by the optical component housing and the projection lens, there is no place for heat to escape. Therefore, if an exhaust port and an exhaust fan are provided exclusively for the power supply unit, the air heated by the power supply unit can be positively discharged. Thereby, the temperature rise of the power supply unit is suppressed, and the power supply unit can be easily stabilized.

A temperature detecting device for detecting the temperature of the cooling air near the power supply unit is provided near the power supply unit. The power supply fan is controlled independently by the temperature detected by the temperature detection device. Is desirable.

Here, it is preferable that the temperature detection device is configured to output a detection signal to a control board for controlling the power supply fan. If the temperature detection device is configured in this way, for example, if the temperature of the power supply unit is detected as high, the number of rotations of the power supply fan is increased, and the power supply unit is controlled to be rapidly cooled. If it is detected that the temperature of the power supply unit is low, the number of rotations of the power supply fan can be reduced and the power supply unit can be controlled to be cooled slowly.

The reference temperature, which is used as a reference for determining whether the detected temperature is high or low, can be appropriately determined based on results obtained through experiments and the like.

With this configuration, it is possible to easily prevent a sudden rise in temperature by supplying power to the drive circuit board and the like, and to easily prevent the power supply unit from being heated. Become.

Further, a lamp driving circuit board for driving a lamp is provided on a side of a U-shaped main body in which the above-described projection lens and an optical component housing are combined and arranged in a plane U-shape. The circuit board is covered with a protective cover member, and a cooling air introduction passage for guiding cooling air taken in from a cooling fan is formed between the projection lens and the optical component casing. Introduced from the cooling air introduction channel between the lower surface and the inner lower surface of the outer case,
It is preferable that an exhaust passage that guides cooling air that has cooled the electro-optical device to the device fan is formed, and the protective cover member has an opening that guides a part of the cooling air that flows through the exhaust passage to the inside.

With this configuration, the inside of the protective cover member can be cooled, so that the inside of the projector can be cooled more efficiently.

Further, since the intake and exhaust passages are formed, the air is efficiently circulated, and the cooling efficiency of the electro-optical device is further improved. Further, by forming the cooling air introduction passage and the exhaust passage in this manner, the structure inside the projector can be simplified, and the cooling air flows through the lower part of the optical component housing, so that the cooling air flows inside the housing. It is also possible to easily cool optical components such as lenses and mirrors to be arranged.

In the above projector, the electro-optical device may include a plurality of light modulators, a prism for combining light modulated by the plurality of light modulators, the projection lens, the light modulator, Along with housing optical components other than the prism, an optical component housing formed so as to surround the light incident surface of the light modulator, has a gap between the optical component housing and the prism. Preferably, a rectifying plate for guiding cooling air from a cooling fan to the light modulation device is provided.

With this configuration, the cooling air from the cooling fan can be guided to the optical modulator by the rectifying plate, so that the air flowing through the gap between the optical component housing and the prism can be efficiently circulated. As a result, the cooling efficiency of the light modulation device is further improved.

Further, it is preferable that the above-mentioned current plate is attached to the optical component casing.

With this configuration, it is not necessary to separately provide a structure for supporting the rectifying plate inside the device just by attaching the optical component housing to the outer case, so that the structure can be simplified. . This makes it possible to easily perform the work of attaching the current plate, and thus the work of assembling the projector becomes easy.

Further, the optical component casing has a fan mounting portion for fixing the cooling fan, and the rectifying plate is desirably mounted between the fan mounting portion and the cooling fan. .

According to this configuration, since the rectifying plate is disposed immediately below the cooling fan, it is possible to guide the cooling air introduced into the device from the cooling fan and to blow the cooling air to the light modulation device. Thereby, the cooling efficiency of the light modulation device is further improved.

Further, the rectifying plate has a mounting piece mounted on the fan mounting portion, and an extending piece extending from an end of the mounting piece toward the light modulation device. It is preferable to be arranged below the cooling fan side edge of the image forming area of the apparatus.

Here, the image forming area refers to an area at the center of the modulator used for forming an image. Since light concentrates in this portion, it is particularly easily heated. Further, when a material such as liquid crystal whose modulation characteristics are easily changed by heat is used, the image quality may be degraded due to a rise in the temperature of the image forming area.

Therefore, if the tip of the extension piece of the current plate is disposed below the edge of the image forming area on the side of the cooling fan, the cooling air is applied to the extension piece and blows directly to the image formation area. Therefore, such a problem can be reduced.

Further, when the electro-optical device is composed of three light modulators for modulating red, green and blue light beams, blue light has larger energy than other color lights,
Since the image forming area of the modulator that modulates this light is easily overheated, if the rectifying plate is arranged in the vicinity of the light modulator that modulates the blue light beam, a rapid rise in the temperature of the light modulator is suppressed. It becomes possible. This makes it possible to further increase the cooling efficiency of the electro-optical device.

[0039]

DETAILED DESCRIPTION OF THE INVENTION First Embodiment Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings.

(1) Overall Configuration of Apparatus FIG. 1 is a schematic perspective view of a projector 1 according to the present embodiment.

The projector 1 converts a light beam emitted from a light source lamp as a light source into red (R), green (G), and blue (B).
These three primary colors are modulated, and the light fluxes of these colors are modulated according to image information through a liquid crystal panel constituting an electro-optical device, and the modulated light fluxes of the respective colors after being modulated are synthesized by a prism (color synthesis optical system). , Which is enlarged and displayed on the projection surface via the projection lens 6. Each component is housed inside an outer case 2 as a housing.

(2) Structure of Outer Case The outer case 2 is basically composed of an upper case 3 that covers the upper surface of the device, a lower case 4 that forms the bottom surface of the device, and a rear case that covers the back surface. The upper case 3 and the lower case 4 are made of magnesium die-cast, and the rear case is made of resin.

An air inlet 240 is provided substantially at the center right of the upper surface of the upper case 3 (right as viewed from the front).
The air intake 240 is provided on a filter exchange lid 241 made of resin which covers the opening. Filter replacement lid 241
Inside, an air filter (not shown) is provided. By attaching and detaching the filter exchange lid 241 from the upper surface side of the upper case 3, the internal air filter can be exchanged.

On the front surfaces of the upper case 3 and the lower case 4, an exhaust port 160 is formed as a vent for discharging air inside the apparatus.

The air intake 24 of such an outer case 2
An AC inlet (not shown) for supplying external power and various input / output terminal groups are arranged on the side and rear sides near zero.

(3) Internal Structure of the Apparatus FIGS. 2 to 4 show the internal structure of the projector 1.

As shown in these figures, inside the device 1, the light source lamp unit 8, which is arranged at one side of the projection lens 6 with an interval, and the projection lens 6 and the light source lamp unit 8 In addition to an optical unit 10 constituting an optical system disposed therebetween, a driver board (not shown) for driving an electro-optical device 925 in the optical unit 10, a main board (not shown) for controlling the entire device 1, and an AC inlet Power from the light source lamp unit 8
, Driver board, main board, electro-optical device 9
A power supply unit (not shown) for supplying a cooling fan 17 disposed above the light source 25 and an exhaust fan (not shown) disposed in front of the light source lamp unit 8 is provided. This power supply unit may be divided into a plurality of units in consideration of the arrangement space in the device 1.

The light source lamp unit 8 includes the projector 1
As shown in FIG. 5, the light source portion includes a light source 183 composed of a light source lamp 181 and a concave mirror 182, and a lamp housing (not shown) for accommodating the light source 183. Such a light source lamp unit 8 is cooled by the cooling air from the cooling fan 17 and the cooling air sucked from the gap between the outer case 2 and the projection lens 6. The cooling air first cools the electro-optical device 925 and the like immediately after being sucked, and thereafter flows to the left side so as to cool substantially the entire area inside the device 1. 8, the air is exhausted from an exhaust port 160 by an exhaust fan (not shown). Therefore, since the light source lamp unit 8 is disposed immediately before the exhaust fan, the light source 183 inside the light source lamp unit 8 is disposed.
Can be efficiently cooled by a large amount of cooling air.

The optical unit 10 is a unit for optically processing a light beam 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 light separation optical system 924, Electro-optical device 925,
And a cross dichroic prism 910 as a color light combining optical system. Electro-optical device 92
5 and the optical elements of the optical unit 10 other than the cross dichroic prism 910,
1, 902 are held vertically. The upper light guide 901 and the lower light guide 902 are integrated and fixed to the lower case 4 by a fixing screw. Here, FIG. 3 is a diagram showing the inside of the upper light guide 901 that has been removed from the lower light guide 902, which is inverted.

The cross dichroic prism 910 having a rectangular parallelepiped shape, as shown in FIG.
2 is fixed to the upper surface side by a fixing screw. Also, each of the liquid crystal panels 925R, 9
25G and 925B are cross dichroic prisms 9
10 are fixed to three side surfaces via fixing members.

Although not shown, each of the liquid crystal panels 925R, 925G, 92 of the electro-optical device 925 is not shown.
A driver board for driving and controlling the 5B is arranged above the optical unit 10, and a main board on which a control circuit for controlling the entire projector 1 is formed is arranged upright behind the optical unit 10. Therefore, the main board and the driver board are arranged at right angles to each other and are electrically connected. An AV board provided with the above-described input terminal group is erected and arranged like the main board, and is electrically connected to the main board.

The projection lens 6 is provided with a flange 62 on the base end side with respect to the projection direction of the projection lens 6. The flange 62 is formed in a rectangular shape protruding radially outward from the outer peripheral surface of the projection lens 6, and has a rectangular plate-shaped head plate 64 erected on the edge of the lower light guide 902.
It is fixed to. Thus, the projection lens 6 is attached to the lower light guide 902.

(4) Structure of Optical System Next, the structure of the optical system of the projector 1, that is, the structure of the optical unit 10 will be described with reference to the schematic diagram shown in FIG.

As described above, the optical unit 10 includes the illumination optical system 923 and the dichroic mirrors 941 and 94.
2 and a color light separation optical system 924 including a reflection mirror 943
, Reflection mirrors 971 and 972, an incident side lens 954,
A relay optical system 927 including a relay lens 973, three field lenses 951, 952, 953, three liquid crystal panels 925R, 925G, 925B, a cross dichroic prism 910, and a projection lens 6 are provided. The light incident side surfaces of the liquid crystal panels 925R, 925G, and 925B are provided on the incident side polarizing plates 960B and 960, respectively.
G, 960R. Also, on the light emitting side,
Emission-side polarizing plates 961B, 961G, and 961R are arranged respectively.

The illumination optical system 923 includes a light source 183 that emits a substantially parallel light beam, a first lens array 921, and a second lens array 921.
, A superimposing lens 932, and a reflection mirror 931. The illumination optical system 923 is an integrator illumination optical system for illuminating the image forming areas of the three liquid crystal panels 925R, 925G, and 925B almost uniformly.

The light source 183 includes a light source lamp 181 as a radiation light source for emitting a radial light beam, and a light source lamp 181.
And a concave mirror 182 that emits the radiated light emitted from the lens as a substantially parallel light beam. As the light source lamp 181, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is often used. As the concave mirror 182, it is preferable to use a parabolic mirror or an elliptical mirror.

The first lens array 921 has a configuration in which small lenses 9211 having a substantially rectangular outline are arranged in a matrix of M rows and N columns. Each small lens 9211
Divides a parallel light beam incident from a light source into a plurality of (ie, M × N) partial light beams, and forms an image of each of the partial light beams near the second lens array 922. Each small lens 92
The contour shape of the eleventh liquid crystal panel 925R, 925G,
925B is set to be substantially similar to the shape of the image forming area. For example, if the aspect ratio (the ratio between the horizontal and vertical dimensions) of the image forming area of the liquid crystal panel is 4: 3, the aspect ratio of each small lens is also set to 4: 3.

The second lens array 922 also corresponds to the small lens 9211 of the first lens array 921.
It has a configuration in which small lenses 9221 are arranged in a matrix of M rows and N columns. The second lens array 922 has a function of aligning the central axes (principal rays) of the respective partial luminous fluxes emitted from the first lens array 921 so as to be perpendicularly incident on the incident surface of the superimposing lens 932. Further, the superimposing lens 932 converts the plurality of partial luminous fluxes into three liquid crystal panels 92.
It has a function of superimposing on 5R, 925G, and 925B. Also, field lenses 951, 952, 953
Has a function of converting each partial light beam applied to the liquid crystal panels 925R, 925G, and 925B into a light beam parallel to the respective central axis (principal ray). The second lens array 922 includes a reflection mirror 931 as shown in FIG.
Are arranged at an angle of 90 degrees with respect to the first lens array 921 with respect to. The reflection mirror 931 is provided to guide the light beam emitted from the first lens array 921 to the second lens array 922. This is not always necessary depending on the configuration of the illumination optical system. For example, the first lens array 921 and the light source
It is not necessary as long as it is provided in parallel with 2.

In the optical unit 10 shown in FIG. 5, substantially parallel light beams emitted from the light source 183 are divided into first and second lens arrays 921 and 921 constituting an integrator optical system.
922 splits the light into a plurality of partial light beams. The partial luminous flux emitted from each small lens 9211 of the first lens array 921 is substantially superimposed on the image forming areas of the liquid crystal panels 925R, 925G, and 925B by the superimposing lens 932. As a result, each liquid crystal panel 925R, 925
G, 925B is illuminated by illumination light having a substantially uniform in-plane distribution.

The color light separation optical system 924 includes two dichroic mirrors 941 and 942 and a reflection mirror 943, and outputs light emitted from the superimposing lens 932 to red, green,
It has the function of separating light into three colors of blue. The first dichroic mirror 941 reflects the red light component of the light beam emitted from the illumination optical system 923, and transmits the blue light component and the green light component. The red light reflected by the first dichroic mirror 941 is reflected by the reflection mirror 943, passes through the field lens 951, and reaches the liquid crystal panel 925R for red. This field lens 951 converts each partial light beam emitted from the second lens array 922 into a light beam parallel to its central axis (principal ray). The same applies to the field lenses 952 and 953 provided in front of the other liquid crystal panels 925G and 925B.

Of the blue light and the green light transmitted through the first dichroic mirror 941, the green light is reflected by the second dichroic mirror 942, passes through the field lens 952, and reaches the green liquid crystal panel 925G. On the other hand, the blue light is transmitted to the second dichroic mirror 94.
2, the incident side lens 954, the relay lens 973
Then, the light passes through a relay optical system 927 having a reflection mirror 972 and further passes through a field lens 953 to reach a liquid crystal panel 925B for blue light. The reason why the relay optical system 927 is used for blue light is that the optical path length of the blue light is longer than the optical path lengths of other color lights, thereby preventing a decrease in light use efficiency due to light diffusion or the like. To do that. That is, this is for transmitting the partial light beam incident on the incident side lens 954 to the field lens 953 as it is.

On the light incident / exit surface side of the liquid crystal panel 925R,
An incident side polarizing plate 960R and an emitting side polarizing plate 961R are arranged. The incident side polarizing plate 960R transmits only specific polarized light among the incident light. The liquid crystal panel 925R modulates the polarized light of the red light emitted from the incident side polarizing plate 960R according to the given image information.
The exit-side polarizing plate 961R transmits only specific polarized light among the modulated light emitted from the liquid crystal panel 925R.

On the light entrance / exit surfaces of the liquid crystal panels 925G and 925B, incident-side polarizers 960G and 960B and exit-side polarizers 961G and 961B are disposed, respectively. The liquid crystal panels 925R, 925 of the present embodiment
As G, 925B, for example, a device using a polysilicon TFT as a switching element can be adopted.

The cross dichroic prism 910 is
It has a function as a color light combining optical system that forms a color image by combining three color lights. The cross dichroic prism 910 includes a dielectric multilayer film that reflects red light,
A dielectric multilayer film that reflects blue light is formed in a substantially X shape along the interface between the four right-angle prisms. Three color lights are synthesized by these dielectric multilayer films.

The light formed by the cross dichroic prism 910 is emitted in the direction of the projection lens 6. The projection lens 6 has a function as a projection unit that projects the combined light on a projection surface such as a projection screen and displays a color image.

(5) Structure of Projection Lens The projection lens 6 enlarges and projects an input optical image. As shown in FIG. 6, a plurality of lenses 61 arranged along a predetermined axis are connected to each other. Have. Multiple lenses 6
Reference numeral 1 is fixed inside a cylindrical body 69 composed of a plurality of members. Further, a rectangular flange 62 protruding radially outward from the outer peripheral surface of the cylindrical body 69 is formed near the base end side with respect to the projection direction of the projection lens 6. The flange 62 is formed on the distal end side of the base end surface of the projection lens 6.

Of the plurality of lenses 61, the lens 61A disposed on the most proximal side with respect to the projection direction has a shape in which the upper end side is cut out as shown in FIG. In addition, the cylindrical body 6 is adjusted according to the shape of the lens 61A.
9 also has a shape in which the upper end is cut out. And
The portion of the side surface of the lens 61A other than the cut-out portion is covered with the cylindrical body 69. Further, the cut-out portion of the side surface of the lens 61A is covered with a plate 67 having a light-shielding property so that intrusion of dust and light leakage into the projection lens 6 is prevented. Has become. The plate body 67 has a frame portion 67A along the outer periphery of the lens surface of the lens 61A.
It is fixed to the cylindrical body 69 by two screws 68. Note that the number of the lenses 61A whose upper ends are notched is determined by the position of the flange 62 formed on the projection lens 6.

As described above, the projection lens 6
It is fixed to the lower light guide 902 via a head plate 64 as a support for supporting the base end side. The head plate 64 is formed in a rectangular shape slightly larger than the contour of the flange 62. The head plate 64 has a lens 6
An opening 65 is formed according to the shape of the outer periphery of 1A, and a lens 61A is inserted into this opening 65 (FIG. 4).

Here, in the projection lens of the present embodiment, since the upper end side of the base lens 61A is cut out, unlike the case of a normal circular lens 61,
The area of the opening 65 can be reduced. Therefore,
The height of the head plate 64 can be reduced. Further, since the ratio of the area occupied by the opening 65 to the area of the head plate 64 can be reduced, the thickness of the head plate 64 can be reduced.

Note that liquid crystal panels 925R, 925G, and 925 as light modulation devices constituting the electro-optical device 925.
As shown in FIG. 8, the center P of the image forming area B is
The extension of the axis 60 of the projection lens 6 and the liquid crystal panel 925R,
925G and 925B are disposed below the intersection point Q. Therefore, the liquid crystal panels 925R, 925G, 925
The optical image from B is cross-dichroic prism 91
In addition, the light passes through the projection lens 6 from below the axis 60 and passes through the projection lens 6, and is projected so as to spread above the axis 60. Therefore, the lens 6 disposed at the most proximal side with respect to the projection direction.
Even if the upper end of 1A is cut away, the image can be enlarged and projected on the projection surface without any problem.

(6) Cooling Structure of Electro-Optical Device FIG. 9 shows a cooling structure of the electro-optical device 925 in the projector 1 described above. Electro-optical device 92
5, a cooling fan 17 (in which the thickness is, for example, 10 to 15 mm) that introduces external air as cooling air from the air inlet 240 and cools the electro-optical device 925.
Degree) is provided. Since the air intake 240 above the cooling fan 17 is provided above,
There is no limit on the amount of air introduced. Therefore, the cooling fan 17 can easily blow sufficient cooling air to the electro-optical device 925.

In the cooling fan 17, the lens 61A disposed at the most proximal side with respect to the above-described projection direction has a shape in which the upper end side is notched. Are located. On the other hand, a pair of vertical walls 64A formed substantially perpendicular to the projection lens 6 mounting surface of the head plate 64 is provided with a step portion 307, and the liquid crystal panels 925R and 925 of the upper light guide 901 are provided.
A step portion 308 is provided on the surface facing 25G and 925B. The cooling fan 17 includes the step 307 and the step 3
08 and fixed by screws. The height position of the step portion 307 and the step portion 308 depends on the electro-optical device 9.
Even if the cooling fan 17 is provided above the cooling fan 25,
7 does not protrude from the upper edge of the head plate 64.

The lower light guide 902 on which the electro-optical device 925 is installed is mounted on a guide member 301 projecting from the upper surface of the lower case 4. Thus, a gap 302 having a height H of, for example, about 8 mm is formed between the upper surface of the lower case 4 and the lower surface of the lower light guide 902. Also, the electro-optical device 925
A hole 303 communicating with the gap 302 is formed in the lower light guide 902 in the periphery. By doing this,
The cooling air introduced by the cooling fan 17 flows as shown by the arrow in FIG. 9, and fresh cooling air is constantly blown to the electro-optical device 925, and then the gap 302
Thus, the power supply unit and the light source lamp unit 8 disposed inside the device 1 can be efficiently cooled.

The above-mentioned air intake 240 is formed as a light shielding structure 305 in order to prevent light leakage from the air intake 240 to the outside of the apparatus. The light shielding structure 305 is formed in a louver shape in which a plurality of plate-like members 306 are arranged in parallel across the air intake 240. Each plate member 306
Are arranged so as to be inclined downward toward the rear side of the device 1. By doing so, the inside becomes difficult to see from the outside, that is, almost no light leaks to the outside. Here, even if light leaks to the outside, the leaked light is emitted to the front of the device 1 from the gap between the plate-shaped members 306, that is, since the emission direction of the leaked light is regulated,
Leakage light does not enter the eyes of the observer behind the apparatus. Therefore, the air intake 240 is formed to have two functions of a function of preventing light leakage and a function of introducing the above-described cooling air.

Next, a procedure for cooling the electro-optical device 925 will be described.

First, by the rotation of the cooling fan 17, the cooling air is forcibly taken into the apparatus 1 from the air inlet 240. The taken-in cooling air flows as indicated by arrows in FIG. 9 and is blown to the electro-optical device 925. The blown air is supplied to the holes 303 and the gaps 30.
2 and flows along the lower case 4 to cool the light source lamp unit 8 and the power supply unit inside the device 1,
The air is exhausted to the outside of the apparatus 1 by the exhaust fan.

(7) Effects of the First Embodiment According to the above-described embodiment, the following effects can be obtained.

That is, an air inlet 240 is provided on the upper surface of the exterior case 2 whose upper part is open, and a cooling fan 17 for introducing cooling air from the air inlet 240 into the device 1 above the electro-optical device 925. Is provided, there is no limit to the amount of air to be introduced, and it is easy to blow sufficient cooling air to the electro-optical device 925 to cool the electro-optical device 925. Accordingly, the electro-optical device 925 can be efficiently cooled, and a cooling structure that can cope with high brightness of the light source lamp 181 and downsizing of the device 1 can be obtained.

The lens disposed closest to the base end with respect to the projection direction is a lens 61A having a notched upper end and a substantially flat surface. Since the cooling fan 17 provided above is arranged close to the electro-optical device 925, cooling air with a large wind force can be introduced into the electro-optical device 925, and the electro-optical device 925 can be cooled more efficiently. . Further, since the cooling fan is provided close to the electro-optical device, the height of the projector 1 can be reduced, and the size and thickness of the projector 1 can be reduced.

Further, the air intake 240 is connected to the light shielding structure 30.
Since it is set to 5, light leakage from the air inlet 240 can be prevented, and the image visibility of the observer behind the device 1 can be improved. Further, since the louver-shaped light-shielding structure 305 is employed, the light-shielding structure 305 alone can prevent light leakage and introduce cooling air, and can increase the number of parts of the projector 1 without increasing the number of parts. Can be reduced in size.

B. Second Embodiment Next, a second embodiment according to the present invention will be described with reference to the drawings. Note that the same or equivalent components as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified.

(1) Internal Structure of the Apparatus The second embodiment differs from the first embodiment in that one exhaust fan 16 is provided near the exhaust port 160 in the first embodiment.
Two are provided near 60.

More specifically, as shown in FIG. 10, a projection lens 6 combined with a flat U-shape having a concave portion 71 and upper and lower light guides 901, which are optical component housings, are provided inside the device 1. 902 (FIG. 2)
1 is arranged so as to face the front side of the outer case 2. The power supply unit 9 that supplies power to a drive circuit board such as a driver board that drives the electro-optical device 925 is disposed in the recess 71. On one side of the upper light guide 901 opposite to the power supply unit 9, a rectangular parallelepiped box-shaped protective cover member 72 is arranged. The light source lamp 1 is provided inside the protective cover member 72.
A lamp driving circuit board for driving the lamp 81 is arranged (not shown). An opening 72A for introducing cooling air into the inside of the protective cover member 72 is formed on the rear side of the device 1 on the side surface of the protective cover member 72 facing the upper light guide 901. An outlet 72B for passing a connection line for connecting the substrate and the light source lamp 181 to each other is formed.

An exhaust fan 16 as an apparatus fan is provided in front of the light source lamp unit 8, that is, between the end face of the upper light guide 901 and the exhaust port 160. The power supply fan 1 is located in front of the power supply unit 9, that is, between the end face of the power supply unit 9 and the exhaust port 160.
5 are provided. The exhaust fan 16 is used to discharge the air taken in by the above-described cooling fan 17 and cooling the inside of the apparatus 1 to the outside of the apparatus 1. The power supply fan 15 is an air heated by the power supply unit 9. Is dedicated to the power supply unit 9 for independently exhausting the air. The exhaust fan 16 and the power supply fan 15 are arranged adjacent to each other. Here, the width dimension of the exhaust port 160 is larger than the width dimension from one side surface of the exhaust fan 16 to one side surface of the power supply fan 15.

A thermo sensor as a temperature detecting device is provided near the power supply unit 9 (not shown). The thermo sensor includes a thermistor that detects the temperature of heated air near the power supply unit 9. This thermosensor outputs a temperature detection signal to a main board (not shown). The main board detects the power supply fan 15 by a signal from the thermo sensor.
, And the number of rotations of the power supply fan 15 is controlled. In other words, the power supply fan 15 described above is independently controlled by the temperature detected by the thermosensor.

That is, if the temperature of the power supply unit 9 is detected to be high by the thermo sensor, the number of revolutions of the power supply fan 15 is increased by the control operation of the main board, and the air heated by the power supply unit 9 is rapidly cooled. It is exhausted outside. Conversely, if the temperature of the power supply unit 9 is detected to be low by the thermo sensor, the rotation speed of the power supply fan 15 is reduced by the control operation of the main board, and the air heated by the power supply unit 9 is gradually discharged to the outside of the apparatus 1. Exhausted. The reference temperature, which is used as a reference for determining whether the detected temperature is high or low, can be appropriately determined based on the results obtained through experiments and the like.

In this embodiment, since the configuration other than the above-described parts, for example, the structure of the optical system, is the same as that of the first embodiment described above, the description thereof will be omitted.

Next, the air flow path inside the projector 1 will be described.

In the projector 1, as schematically shown by the arrows in FIG.
1. Device exhaust passage 85 and power supply unit exhaust passage 8
4 are formed. However, the air flowing through each of the flow paths 81, 84, and 85 does not strictly flow along the arrows in the figure, but is drawn and discharged generally as shown by the arrows through the gaps between the components. It is.

The cooling air introduction flow path 81 is formed by a cooling fan 17 disposed between the projection lens 6 and the upper light guide 901 and the lower light guide. Road. After cooling the electro-optical device 925, the cooling air is discharged to the outside of the device 1 by the exhaust fan 16 through the device exhaust passage 85.

The device exhaust passage 85 is formed between the lower surface of the lower light guide and the inner lower surface of the outer case 2 and the second device exhaust passage 82 formed inside the protective cover member 72. And a device exhaust passage 83. First
The device exhaust passage 82 is a first passage for cooling air that has cooled the electro-optical device 925, passes under the lower light guide and the light source lamp unit 8, and is discharged from the exhaust port 160 to the outside of the device 1 by the exhaust fan 16. Is discharged. Thus, the optical unit 1 provided above the lower light guide
0, the light source lamp unit 8 and the like can be efficiently cooled. The second device exhaust passage 83 is a second passage for cooling air that has cooled the electro-optical device 925, and a part of the cooling air passing through the first device exhaust passage 82
A into the inside of the protective cover member 72 from the outlet port 72B.
Through the protective cover member 72 and the exhaust fan 16
Is discharged to the outside of the apparatus 1 through the exhaust port 160.

The power supply unit exhaust passage 84 is a passage for air heated by the power supply unit 9, and the heated air is supplied from the exhaust port 160 to the device 1 by the power supply fan 15.
It is discharged outside.

(2) Effects of the Second Embodiment According to the above-described second embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained.

That is, since the exhaust port 160 for exhausting the air inside the device 1 to the outside is provided on the front surface of the outer case 2, the air taken into the device 1 by the cooling fan 17 is exhausted to the front of the device 1. can do. Thereby, the exhausted air does not blow to the observer behind or on the side of the apparatus 1, and the observer does not feel uncomfortable.

Further, since the exhaust port 160 is formed on the front surface of the outer case 2, light leakage from the exhaust port 160 is not recognized by the observer behind or on the side of the apparatus 1, and the observer can visually recognize the image. Performance can be improved.

Further, the exhaust fan 16 is connected to the exhaust port 160.
And the power supply fan 15 dedicated to the power supply unit 9, the air heated by the power supply unit 9 can be positively discharged, the temperature rise of the power supply unit 9 can be suppressed, and the power supply unit 9 can be stabilized. Can be easily achieved.

Further, since a thermo sensor is provided near the power supply unit 9 and the power supply fan 15 is independently controlled based on the temperature detected by the thermo sensor, power is supplied to the drive circuit board and the like, and the temperature suddenly decreases. It is possible to easily prevent the power supply unit 9 from rising, and to easily prevent the power supply unit 9 from being heated.

Further, the cooling air introduction passage 81, the first device exhaust passage 82, and the second device exhaust passage 8
Since the apparatus exhaust flow path 85 and the power supply unit exhaust flow path 84 are provided, the inside of the protective cover member 72 can also be cooled, and the inside of the projector 1 can be cooled more efficiently.

Further, since the intake and exhaust passages are formed, the air is efficiently circulated and the electro-optical device 92
5 can be further improved in cooling efficiency. Furthermore, by forming the cooling air introduction flow path 81 and the exhaust flow paths 84 and 85 in this way, the structure inside the projector 1 can be simplified, and the cooling air flows through the lower part of the lower light guide. Optical components such as lenses and mirrors disposed inside the upper light guide 901 and the lower light guide can also be easily cooled.

C. Third Embodiment Next, a third embodiment according to the present invention will be described with reference to the drawings. The same or corresponding components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

(1) Internal Structure of the Apparatus In the third embodiment, a rectifying plate 91 is provided in a gap between the upper light guide 901 and the prism 910 of the first embodiment.

As shown in FIG. 12, cooling is provided at two corners of the upper light guide 901 formed so as to surround the light modulators 925R, 925G, and 925B attached to the side surfaces of the cross dichroic prism 910. A fan mounting portion 90 for screwing the fan 17 is provided. Of these fan mounting portions 90,
A rectifying plate 91 that guides cooling air from the cooling fan 17 to the liquid crystal panel 925B is provided in the fan mounting portion 90 on the liquid crystal panel 925B side.

As shown in FIG. 13, the rectifying plate 91 has a mounting piece 92 mounted on the fan mounting portion 90,
An extension piece 93 that extends vertically from the end of the attachment piece 92 toward the electro-optical device 925 and the lower light guide 902 is formed in an L-shaped cross section. The tip of the extension piece 93 is connected to the image forming area 94 of the liquid crystal panel 925B.
Is extended to below the upper edge. Here, the image forming area 94 refers to an area in the center of the liquid crystal panel 925B used for forming an image. In this part,
Because light concentrates, it is particularly easy to overheat. Further, when a material such as liquid crystal whose modulation characteristics are easily changed by heat is used, the image quality may be degraded due to a rise in the temperature of the image forming area. However, in the present embodiment, the tip of the extension piece 93 extends below the upper edge of the image forming area 94 of the liquid crystal panel 925B, so that the cooling air from the cooling fan 17 is supplied to the image forming area 9.
4 can be directly sprayed, so that such a problem can be reduced. Further, in the present embodiment, the current plate 91 is connected to the liquid crystal panel 92.
By attaching to the 5B side fan mounting portion 90 and turning the surface of the extension piece 93 toward the liquid crystal panel 925B side,
In particular, a large amount of cooling air is blown onto the image forming area 94 of the liquid crystal panel 925B. Although blue light has higher energy than other color lights, it is easy to heat. However, in the present embodiment, the cooling air flowing downward while rotating from the cooling fan 17 hits the head plate 64 and is reflected to cool the liquid crystal panel 925B. And the rectifying plate 91
And is directly blown onto the image forming area 94, so that the blue light image forming area 94 can be efficiently cooled.

(2) Effects of Third Embodiment According to the third embodiment described above, the same effects as those of the first and second embodiments can be obtained, and the following effects can be obtained.

That is, since the rectifying plate 91 is provided in the gap between the upper light guide 901 and the prism 910, the cooling air from the cooling fan 17 can be guided to the liquid crystal panel by the rectifying plate 91. The air flowing in the gap between the 901 and the prism 910 is efficiently circulated, and the cooling efficiency of the electro-optical device 925 can be further improved.

Further, the current plate 91 is connected to the upper light guide 901.
Since there is no need to provide a separate structure for supporting the current plate 91 inside the device, the structure can be simplified. Thus, the work of attaching the current plate 91 can be easily performed, and the work of assembling the projector 1 can be easily performed.

Further, since the rectifying plate 91 is mounted between the fan mounting portion 90 and the cooling fan 17, the rectifying plate 91 can be fixed to the upper light guide 901 simultaneously with the cooling fan 17. Further, the cooling air introduced into the inside of the device from the cooling fan 17 is efficiently guided to the liquid crystal panel 9.
25B, and the cooling efficiency of the liquid crystal panel 925B can be further improved.

Further, since the leading end of the extension piece 93 extends below the upper end edge of the image forming area 94, the cooling air can be applied to the extension piece 93 and blown directly to the image forming area 94. From this point, the cooling efficiency of the liquid crystal panel 925B can be further improved.

Further, the current plate 91 is connected to the liquid crystal panel 925.
Since the liquid crystal panel 925 is disposed near B, it tends to overheat.
A large amount of cooling air can be blown to B, and a rapid rise in temperature of the liquid crystal panel 925R can be suppressed.

D. Modifications of Embodiment The present invention is not limited to the above-described embodiment, but includes the following modifications.

For example, in the first embodiment, the plate-shaped member 306 is arranged so as to be inclined downward toward the rear side of the apparatus 1. However, the present invention is not limited to this.
May be arranged so as to be inclined toward the front side of the vehicle.

In the first embodiment, the light shielding structure 3
05 adopts a plate-shaped member 306 formed in a louver shape. However, the present invention is not limited to this, and any structure may be used as long as light leakage is prevented, and the shape and configuration may be appropriately determined in implementation.

Further, in the first embodiment, the light shielding structure 305 is provided in the air intake 240, but is not limited to this.
For example, the light shielding structure 305 may be provided so as to cover the filter replacement cover 241 in which the air intake 240 is formed, or may be provided inside the filter replacement cover 241, that is, provided above the cooling fan 17. The air intake 2
It suffices if light leakage from 40 to the outside is prevented.

Further, in the first embodiment, the number of lenses whose upper end is cut out is one of the lenses 61A disposed at the most proximal side in the projection direction, but is not limited to this. , May be plural. At this time, the number of lenses whose upper ends are notched is set according to the position and the number of components arranged inside the apparatus 1 and the desired size of the projector 1, and the liquid crystal panels 925R, 925G,
It is desirable that the setting be made so as not to affect the optical image from 925B.

Further, in the second embodiment, the air flow path is constituted by the cooling air introduction flow path 81, the apparatus exhaust flow path 85, and the power supply unit exhaust flow path 84, but is not limited to this. Alternatively, for example, four flow paths may be formed,
One channel may be formed, and the number, configuration, and the like of the channels are as follows.
What is necessary is just to determine suitably according to arrangement | positioning of each component.

In the second embodiment, a thermo sensor is provided near the power supply unit 9 to control the power supply fan 15. However, the present invention is not limited to this.
The heated air may be discharged out of the apparatus 1 at regular intervals.

Further, in the second embodiment, in addition to the exhaust fan 16, the power supply fan 15 for independently exhausting the air heated by the power supply unit 9 is provided. However, the present invention is not limited to this. It is sufficient that the heated air can be positively discharged by the power supply 9, the temperature rise of the power supply unit 9 can be suppressed, and the power supply unit 9 can be easily stabilized.

In the third embodiment, the extension piece 93 is provided.
Is disposed below the upper edge of the image forming area 94, but is not limited thereto. For example, if the shape of the extension piece is formed so as to blow cooling air to the image forming area 94, It may be arranged above the upper edge of the image forming area 94.

Further, in the third embodiment, the current plate 9
Although 1 is attached to the fan attachment section 90, the present invention is not limited to this. For example, a dedicated attachment section for attaching a rectifying plate to the upper light guide 901 may be provided and attached.

In the third embodiment, the current plate 91 is used.
Is attached to the light guide, but is not limited to this, and may be attached to the head plate 64, for example.

In the above embodiment, the liquid crystal panel 92
Although the rectifying plate is provided only for 5B, the present invention is not limited to this. For example, the upper light guide 901 and the prism 910 may be provided.
The liquid crystal panel 925R and the liquid crystal panel 925G may be provided in a gap between the liquid crystal panel 925R and the liquid crystal panel 925G as long as the flow of the cooling air is not hindered.

In the above-described embodiment, the exhaust port 160 is provided on the front surface of the outer case 2. However, the present invention is not limited to this. For example, the exhaust port 160 may be provided on the side surface of the outer case 2.

In the above embodiment, the electro-optical device 925
Are TFT-driven liquid crystal panels 925R, 925G, 92
5B, the present invention is not limited to this, and the present invention may be applied to a projector including a light modulation device configured by another driving method.

In the above embodiment, the electro-optical device 925 includes three liquid crystal panels 925R, 925G, 92
5B, the present invention is not limited to this, and the present invention may be applied to a light modulation device including one or two liquid crystal panels.

In the above embodiment, the electro-optical device 9
The panel constituting the liquid crystal panel 25 was a liquid crystal panel, but may be other than a liquid crystal panel. For example, a light modulation device including a device for forming an image by plasma emission and a device using a micromirror is provided. The present invention may be applied to a projector.

Further, the electro-optical device 925 in the above embodiment is of a type in which light fluxes R, G, and B are transmitted and modulated. However, the present invention is not limited to this. The present invention may be applied to a projector including a reflection type light modulation device that emits light.

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

[0128]

According to the present invention as described above, an air inlet for taking in external air as cooling air is formed on the upper surface of the outer case, and the air is cooled from the air inlet above the electro-optical device. Introducing air and providing a cooling fan for cooling the electro-optical device,
Sufficient cooling air can be easily blown, whereby the electro-optical device can be efficiently cooled, and a cooling structure capable of coping with high brightness of the light source lamp and downsizing of the device can be obtained. is there.

[Brief description of the drawings]

FIG. 1 is an external perspective view illustrating a projector according to a first embodiment of the invention.

FIG. 2 is a perspective view showing an internal structure of the projector in the embodiment.

FIG. 3 is a perspective view showing an internal structure of the projector in the embodiment.

FIG. 4 is a perspective view showing an internal structure of the projector in the embodiment.

FIG. 5 is a schematic diagram for explaining a structure of an optical system in the embodiment.

FIG. 6 is a longitudinal sectional view showing a projection lens in the embodiment.

FIG. 7 is a perspective view showing a projection lens in the embodiment.

FIG. 8 is a diagram showing an optical image in the embodiment.

FIG. 9 is a cross-sectional view of the projector according to the embodiment.

FIG. 10 is a perspective view illustrating an internal structure of a projector according to a second embodiment of the invention.

FIG. 11 is a perspective view showing a flow path of air inside the projector in the embodiment.

FIG. 12 is an exploded perspective view illustrating an internal structure of a projector according to a third embodiment of the invention.

FIG. 13 is a sectional view showing a main part in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projector 2 Outer case 6 Projection lens 8 Light source 9 Power supply unit 15 Power supply fan 16 Exhaust fan which is a device fan 17 Cooling fan 61 Lens 61A Lens arranged at the base end side 71 Depression 72 Protective cover member 81 Cooling air introduction channel 84 Power supply unit exhaust passage 85 Device exhaust passage 90 Fan mounting section 91 Rectifier plate 92 Mounting piece 93 Extension piece 94 Image forming area 160 Exhaust port 240 Air intake 305 Light shielding structure 306 Plate member 901, 902 Optical component housing Upper and lower light guides 925 electro-optical device

Claims (12)

[Claims] 1. A projector comprising: an electro-optical device that forms an optical image according to image information; and an outer case that covers a main body including the electro-optical device. An air inlet for taking in the air as cooling air is formed, and a cooling fan for introducing the cooling air from the air inlet and cooling the electro-optical device is provided above the electro-optical device. A projector, wherein the projector is provided. 2. The projector according to claim 1, further comprising: a projection lens configured to enlarge and project an image formed by the electro-optical device, wherein the projection lens includes a plurality of lenses arranged along a predetermined axis. A projector, wherein at least the lens disposed at the most proximal side with respect to the projection direction among the plurality of lenses has a shape in which the upper end side is cut out. 3. The projector according to claim 1, wherein a light shielding structure for preventing light from leaking from the air inlet is provided above the cooling fan. . 4. The projector according to claim 3, wherein in the light shielding structure, a plurality of plate-like members arranged in parallel across the air inlet have their surfaces facing an opening surface of the air inlet. A projector characterized in that it is formed in a louver shape arranged to form a predetermined angle. 5. The projector according to claim 1, wherein an exhaust port for discharging air inside the projector to the outside is provided on a front surface of the outer case. Features projector. 6. The projector according to claim 5, further comprising: a projection lens for enlarging and projecting an image formed by the electro-optical device; and an optical component housing for housing an optical component. The optical component housing is combined and arranged in a plane U-shape having a concave portion, the concave portion faces the front side of the outer case, and the concave portion has a drive for driving the electro-optical device. A power supply unit for supplying electric power to a circuit board or the like, an exhaust fan, a device fan for taking in the air cooled by cooling the inside of the projector to the outside of the projector, and the power supply unit. And a power supply fan for independently exhausting air heated by the projector. 7. The projector according to claim 6, further comprising: a temperature detection device for detecting a temperature of cooling air near the power supply unit, the temperature detection device being provided near the power supply unit. A projector characterized by being independently controlled by a detected temperature. 8. The projector according to claim 6, wherein a lamp is driven to a side of a U-shaped main body in which the projection lens and the optical component casing are combined and arranged in a plane U-shape. A lamp driving circuit board for covering the lamp driving circuit board with a protective cover member, and between the projection lens and the optical component housing, cooling air taken in from the cooling fan. A cooling air introduction flow path for guiding is formed, and cooling air introduced from the cooling introduction flow path and cooling the electro-optical device is provided between the lower surface of the optical component housing and the inner lower surface of the outer case. A projector, wherein an exhaust passage leading to the device fan is formed, and an opening is formed in the protective cover member to lead a part of the cooling air flowing through the exhaust passage to the inside. 9. The projector according to claim 1, wherein the electro-optical device includes a plurality of light modulators, and a prism that combines light modulated by the plurality of light modulators. An optical component housing that houses optical components other than the projection lens, the light modulation device, and the prism, and is formed so as to surround a light incident surface of the light modulation device; In the gap between the component housing and the prism,
A projector, comprising: a rectifying plate for guiding cooling air from the cooling fan to the light modulation device. 10. The projector according to claim 9, wherein the rectifying plate is attached to the optical component casing. 11. The projector according to claim 10, wherein the optical component casing has a fan mounting portion for fixing the cooling fan, and the rectifying plate includes the fan mounting portion and the cooling fan. And a projector mounted between the projector and the projector. 12. The projector according to claim 11, wherein the rectifying plate includes a mounting piece mounted on the fan mounting portion, and an extending piece extending from an end of the mounting piece toward the light modulation device. A projector, wherein a tip of the extension piece is disposed below an edge of the image forming area of the light modulation device on a side of the cooling fan.