JP2003207849A - Lamp device and projector provided with the lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp device capable of improving heat radiation performance for securing safeness and reliability and miniaturizing the device, and a projector utilizing the lamp device. <P>SOLUTION: The lamp device is provided with a lamp unit 100 having a lamp 110, a reflector 120 having a curved shape and an aperture on one end and capable of reflecting light radiated from the lamp 110 in a prescribed direction and a housing fitting frame body 140 for supporting and fixing the reflector 120 on its aperture end part, a glass plate 300 for protecting the lamp 110 and the reflection surface of the reflector 120 and a housing 200 for holding the lamp unit 100 and the glass plate 300. A 1st air duct 213 for cooling the inner surface of the reflector 120 is arranged between the frame body 140 and the glass plate 300 and a 2nd air duct 215 for cooling the rear surface of the reflector 120 is arranged between the frame body 140 and the rear surface wall of the housing 200. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp device and a projector provided with the same, and more particularly to improving the cooling performance thereof.

[0002]

2. Description of the Related Art In a lamp device including a lamp and a housing or a case for holding the lamp, the lamp is apt to generate heat and become hot when used. In particular, an illumination lamp device used in a projector tends to have a higher temperature as the brightness and size of the projector increase. For this reason, it is important for the lamp device and the equipment using the lamp device to take heat dissipation measures from the viewpoint of safety and reliability. Further, as a heat dissipation measure of this lamp device, conventionally, mainly by radiation heat dissipation using a fan.

[0003]

However, in the heat radiation of the lamp device which depends on the radiation heat radiation, the number of fans is increased, the capacity of the fans is increased, or the rotation speed of the fans is increased in accordance with the higher brightness of the lamp. It is necessary to reduce the size of the lamp device and the equipment using the lamp device. Further, conventionally, a housing for supporting a lamp, a local portion of a case, or a corresponding portion of an outer case of a device accommodating a lamp device may have a particularly high temperature as compared with other places. The present invention has been made in view of the above problems, and achieves both the improvement of heat dissipation performance and the miniaturization of the device for ensuring safety and reliability, a lamp device and a device using the same,
In particular, it is an object to provide a projector.

[0004]

In order to solve the above problems, the present invention adopts the following configurations.

(1) In the lamp device of the present invention, a lamp and a lamp unit having a curved reflector that reflects light emitted from the lamp in a predetermined direction and one end of which is open, and the lamp and the reflecting surface of the reflector are provided. A first transparent plate member for protection and a housing for holding the lamp unit and the transparent plate member, the first transparent plate member communicating with the outside of the housing between the opening end of the reflector and the transparent plate member. An air passage is provided, and the lamp unit and the light-transmissive plate member are arranged to face each other through the air passage. According to this configuration, the lamp, which is the heat source, can be directly air-cooled, so that the cooling capacity thereof is greatly improved. (2) Further, in the above apparatus, the lamp unit has a housing mounting portion for fixing the housing with the opening side outer peripheral portion of the reflector, and the housing receives the housing mounting portion. It may be configured to have a lamp unit holding portion that holds the lamp unit and a plate material holding portion that receives and holds the light transmissive plate material. (3) Further, in the above apparatus, the housing attachment portion may include a rib that receives and supports and fixes the opening-side outer peripheral end portion of the reflector. (4) In the above apparatus, if the ribs support a half or more of the opening-side outer circumference of the reflector, the reflector can be stably fixed to the housing mounting portion. (5) Further, in the above apparatus, a flat portion having a shape in which a part of the outer peripheral portion is cut off is provided on the outer peripheral portion on the opening side of the reflector, and the flat portion is opposed to the inner surface of the rib. This makes it possible to reduce the size of the lamp unit,
The flat surface forms a flow along the back surface of the reflector. (6) Further, in the above device, a second air passage communicating with the outside of the housing is arranged between the housing mounting portion and the rear wall of the housing. This second air passage makes it possible to cool the reflector from the rear side. (7) Further, in the above apparatus, each of the first air passage and the second air passage may include an intake / exhaust port formed on a side wall of the housing. (8) In (7), if the intake / exhaust ports forming the first air passage are made smaller than the intake / exhaust ports forming the second air passage, the air velocity in the first air passage will be the second. It becomes faster than that of the air passage, and the cooling efficiency of the lamp can be made higher than that of the reflector.

(9) In the above device, the housing is made of metal. In this case, the preferred one is
It is magnesium, aluminum, titanium, or an alloy containing some of these. Metals, especially the metals listed here, are lighter in weight and have better thermal conductivity than other materials, and they are solid and have excellent heat resistance. Have advantages. For this reason, even if a local high temperature portion is generated in the housing, the temperature of the high temperature portion is immediately soaked and reduced.
Further, since the heat generated in the lamp unit is favorably conducted to the housing, heat dissipation of the lamp unit is also promoted. (10) In the above apparatus, the inner surface of the housing may be surface-treated to increase the heat absorption rate of the inner surface of the housing more than the heat absorption rate of the metal itself. This can increase the amount of heat transfer from the lamp unit to the housing due to radiation. (11) Further, in the above apparatus, the outer surface of the housing may be subjected to a surface treatment for increasing the heat emissivity of the outer surface of the housing more than the heat emissivity of the metal itself. This can increase the amount of heat transferred from the housing to the outside by radiation. (12) Further, in the above apparatus, the ignition voltage of the lamp is preferably 10 KV or less. As a result, the insulating distance for maintaining the insulating property can be reduced, and the types of materials used for the lamp unit and the housing can be expanded.

(13) A projector according to the present invention comprises the lamp device according to any one of (1) to (12) above.
The light source for illumination is provided inside the outer case. According to this, the projector can be downsized and the brightness can be increased corresponding to the improvement of the cooling capacity of the lamp device. (14) In addition, in the case where the projector includes a metal housing that holds an optical element that constitutes an optical system,
It is preferable that the lamp device is fixed to the metal housing so as to be able to conduct heat by using the housing thereof. By doing so, it is also possible to conduct the heat of the lamp unit to the metal housing through the housing and dissipate the heat. (15) Further, in the above projector, an air passage is arranged between the lamp device and the outer case. As a result, the heat of the lamp device is not directly transferred to the outer case, and the safety of the projector user is ensured. (16) In addition, in (15), a thermal buffer material having a lower thermal emissivity than the housing of the lamp device can be disposed on the lamp device side of the facing portion of the lamp device and the outer case. (17) Further, in (15), a thermal cushioning material having a higher heat reflectance than that of the outer case can be disposed on the outer case side of the facing portion between the lamp device and the outer case.
With these configurations (16) and (17), the amount of heat transferred from the lamp device to the outer case can be reduced, and the projector user can be safe. (18) Furthermore, in the projector, air flowing across the emitted light may be introduced into the optical path of the emitted light from the lamp device. As a result, the flow of heat from the lamp device toward the other optical elements is suppressed, so that the influence of heat generation of the lamp device on the optical elements arranged after the lamp device can be reduced.

[0008]

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

Embodiment 1 (Lamp Device) FIG. 1 is an explanatory diagram showing a configuration of a lamp unit that constitutes a lamp device according to an embodiment of the present invention. As illustrated, the lamp unit 100 includes various lamps (here, a high pressure mercury lamp 110) and a reflector 120 having one end opened. The high-pressure mercury lamp 110 includes a light emitting tube 111 in the center and seal portions 1 on both sides of the light emitting tube 111.
It consists of 12, 113. The reflector 120 has an inner surface formed of a spheroidal mirror, a parabolic mirror, or the like, and has a portion having an effective reflection surface 121 that effectively reflects the light of the lamp 110, and an opening on the tip side of the effective reflection surface 121. And a reflector support portion 122 provided with a housing attachment frame 140 for attaching the reflector 120 to a housing described later. The inner surface of the reflector support 122 may not be an effective reflection surface. Lamp 11
0 is from the reflector 120 to the seal portion 112 on the optical axis.
The end portion of is penetrated to the outside, and is fixed to the central bottom portion of the reflector 120 by this penetration portion.

Power supply lead wires 131 and 132 extend from the seal portions 112 and 113. One of the power supply lead wires 131 is connected to the connector 150 from the seal portion 112 of the lamp 110. The other of the power supply lead wires 132 penetrates through a hole 123 provided in the reflector 120 from a seal portion 113 having a winding of a lighting auxiliary wire 133, which will be described later, and a terminal block 124 attached to the outer surface of the reflector 120. Is connected to the connector 150 via. The connector 150 is further connected to the power supply unit 16
It is connected to 0. The auxiliary lighting line 133 has a function of facilitating the dielectric breakdown at the time of starting the lamp 110 and improving the lighting property.
It is wound around 13, and one end thereof is wired along the arc tube 111 of the lamp 110 and the seal portion 112 on the side without winding, and further connected to the power supply lead wire 131.

Next, a lamp device employing the above lamp unit 100 will be described. The lamp device of this embodiment basically includes a lamp unit and a housing that holds the lamp unit. 2 to 4 show a lamp device according to an embodiment of the present invention, FIG. 2 is a perspective view showing an assembling method of a lamp unit and a housing, and FIG. 3 is a perspective view showing the lamp device from the rear side. 4 and 5 are front views of the lamp device as viewed from the front. Note that in these figures, FIG.
The power supply lead wires 131, 132 and the connector 15 described in
0 is omitted.

The reflector 120 constituting the lamp unit 100 has a housing mounting frame 1 on the outer peripheral portion on the opening side.
Although it is already described that the housing mounting frame body 140 is provided with the housing 40, the housing mounting frame body 140 has a size of at least the diameter of the tip of the effective reflection surface of the reflector 120 so that all the parallel light reflected by the reflector 120 can pass through. It has an opening. Further, the shape of the housing mounting frame 140 is not particularly limited, but a square frame which is easy to manufacture is used here. The housing mounting frame 140 has a wall surface that fits with the opening-side outer peripheral end of the reflector 120,
The wall surface is used to support and fix the reflector 120. The wall surface of the housing mounting frame 140 can be formed by ribs 141 protruding around the housing mounting frame 140. The rib 141 and the opening-side outer peripheral end of the reflector are preferably fitted in as many regions as possible (including a linear region and a curved region), and the rib 141 is fitted to a half or more of the opening-side outer periphery of the reflector 120. And, stable fixation is realized. Also, an adhesive or the like may be used together when the fitting is performed.
Further, here, the bottom surface side of the housing mounting frame 140 is projected forward longer than the other sides to form the pedestal 142, the pedestal 142 is positioned with respect to the housing 200, and / or heat conduction with the housing 200 is performed. Are used for.

Further, the reflector 120 has four flat portions 125 corresponding to the shape of the housing mounting frame 140 in a state in which a part of the bulging portion of the outer peripheral portion on the opening side, which originally has a circular sectional shape, is cut. In preparation for this, the flat portion 125 is located inside each side of the housing mounting frame 140.
The flat portion 125 may be disposed so as to be opposed to the rib 141 and fitted. This flat portion 125 of the reflector 120 is
In addition to reducing the shape of the lamp unit 100, it can be used for positioning when the reflector 120 and the housing mounting frame 140 are mounted. In addition, this flat portion 125
Also serves to cause the air flowing on the back surface of the reflector 120 to flow along the reflector.

On the other hand, the housing 200 for holding the lamp unit 100 is a substantially box-like shape with one end opened for housing the lamp unit. The housing 200 here is
As shown in FIGS. 2 and 3, the bottom surface 201, the front wall 202,
It is provided with side walls 203, 204 and a back wall 205. Further, the lamp unit 1 is provided at the center of the housing 200.
The lamp unit holding portion 206 for holding (or engaging) holding 00 is provided. Further, the front wall 202 has an opening 202A having a size corresponding to the opening diameter of the reflector 120, and inside the front wall 202, a glass plate 300 which is a light transmissive plate material for protecting the lamp 110 and the reflector 120. A glass plate storage groove 207 for storing and holding is provided. The housing 200 also has a vent 208 on the bottom surface 201 and a connector (connector 1 of FIG. 1 on the rear side.
Connector installation part 209 for attaching (corresponding to 50). The housing 200 also has screw fixing portions 210 and 211 for fixing the housing 200 to other parts and the housing.

In this lamp device 1, the first air passage 213 is provided between the housing mounting frame 140 and the glass plate 300.
However, the housing mounting frame body 140 is fixed to the housing 200 so that the second air passages 215 are formed between the housing mounting frame body 140 and the housing rear wall 205, respectively. The intake and exhaust ports of the first air passage 213 and the second air passage 215 are the side wall 2 of the housing 200.
It is formed by cutting out 03, 204. In that case, in order to increase the heat radiation efficiency of the lamp 110 more than the heat radiation efficiency of the reflector 120, the area of the intake / exhaust port 214 of the first air passage 213 is made smaller than the area of the air intake / exhaust port 216 of the second air passage 215. The velocity of the air flowing through the first air passage 213 may be set higher than the velocity of the air flowing through the second air passage 215.

The housing is not limited to the shape shown in FIGS. 2 and 3, and the lamp unit 100 is not limited thereto.
And the glass plate 300 has a shape capable of being stored and held, and the front wall thereof opens corresponding to the opening of the reflector,
Further, it may be any one provided with the above-mentioned first and second air passages communicating with the outside. The presence or absence of the top surface and the notches in the bottom surface and the surrounding wall can be designed appropriately.

Although the housing 200 may be made of resin, it contains a metal, particularly a metal such as Mg, Al, or Ti, or at least a part thereof, from the viewpoint of its thermal conductivity, heat resistance, rigidity and the like. It is better to use the one made of alloy. In the case of a metal housing, it is preferable that the surface of the metal exposed to the lamp 110 is subjected to insulation treatment by coating a material having an insulating property or by anodizing treatment.

The metal housing 200 is preferably provided with a surface treatment for increasing the heat absorption rate of the inner surface of the metal housing 200 more than that of the metal itself. Furthermore, it is preferable that the outer surface of the metal housing 200 is subjected to a surface treatment for increasing the heat emissivity of the outer surface thereof than that of the metal itself. These treatments can be carried out by a chemical treatment such as painting, attaching a sheet, or anodizing treatment. By such processing or treatment, it is possible to promote heat transfer from the lamp unit 100 to the housing 200.
Further, as the lamp 110 of the lamp unit 100, a lamp having an ignition voltage of 10 KV or less is preferably used from the viewpoint of insulation, and a lamp of 5 KV or less is particularly preferable.

According to the lamp device of the first embodiment, the air flowing through the first air passage 213 can directly cool the reflecting surfaces of the lamp 110 and the reflector 120, which are light emitting sources, and
The back surface of the reflector 120 can also be air-cooled by the air flowing through the second air passage 215. In addition, the heat of the lamp unit 100 is transmitted through the housing mounting frame 140 to the housing 20.
Since the heat is conducted to 0 and the housing 200 is air-cooled, the heat dissipation capability of the lamp device 1 is improved.

Embodiment 2 (Projector) Here, a projector using the lamp device described in Embodiment 1 will be described. (1) External Structure of Projector FIG. 5 is an external view of the projector according to the embodiment of the present invention as viewed from the top side, and FIG. 6 is an external view of the projector as viewed from the bottom side. The main component of the projector is the outer case 2.
It is stored inside. Here, the outer case 2 is composed of an upper case 3 that covers the upper part of the device, a lower case 4 that covers the lower part of the device, and a front case 5 that covers the front part. These exterior cases 2 can be manufactured from metal or resin. However, from the viewpoint of its rigidity and heat dissipation, the outer case 2 is preferably manufactured from a metal such as magnesium, aluminum, or titanium, or an alloy containing at least a part thereof.

As shown in FIG. 5, on the right side of the upper surface of the upper case 3, there is provided a ceiling intake port 24 covered with a filter replacement lid 21. In this filter replacement lid 21,
A slit-shaped opening 22 for introducing air taken in from the outside as cooling air into the apparatus is formed, and an air filter (not shown) is provided inside the filter replacement lid 21. By detaching and attaching the filter exchange lid 21 from the upper surface side of the upper case 3, the internal air filter can be exchanged.

On the top surface of the upper case 3,
A speaker (not shown) is provided in front of the filter replacement lid 21.
A large number of communication holes 23 for use are formed. An operation panel 25 for adjusting the image quality and the like of the projector is provided beside the communication hole 23. A portion where the filter replacement lid 21, the communication hole 23, and the operation panel 25 are provided is a bulging portion 3A in which a part of the upper case 3 bulges upward, and by this bulging portion 3A. The air filter, the speaker, the circuit board for the operation panel 25, and the like described above are housed in the formed interior.

On the other hand, as shown in FIG. 6, the lower case 4
A bottom inlet 4A for supplying cooling air to the inside is formed on the bottom of the lamp, and a lamp lid 4B that is opened and closed for replacing the lamp device fixed in the outer case is provided near the bottom inlet 4A with a screw 35. It is installed in. Further, feet 31R and 31L are provided at the front corners of the lower case 4, and a foot 31C is provided at the rear center part. Foot 3
1R and 31L are configured to move forward and backward in the projecting direction by rotating the dial portion or operating the levers 32R and 32L, and the height and inclination of the display screen can be changed by adjusting the amount of forward and backward movement. Has become.

The front end of the projection lens 6 projects from the front case 5, and the light receiving section 33 for receiving an optical signal from a separate remote controller is provided at the right end of the front case 5. , Front case 5
An exhaust port 34 for exhausting the air inside the outer case 2 is provided in the central portion of the. Further, on the side surface and the back surface of the outer case 2, an AC inlet 4 for connection with an external power source is provided.
0 and various input / output terminal groups 41 exposed to the outside are arranged.

(2) Internal Structure of Projector FIG. 7 is a mounting view of the inside of the projector according to the embodiment of the present invention as viewed from above. Inside the outer case 2, the power supply unit 9 (9A, 9B, 9C), the first embodiment.
The illuminating lamp device 1 described above, an optical unit 10 described later that constitutes an optical system of the projector excluding the lamp device 1, a projection lens 6 for projecting light emitted from the optical unit 10, and a main control circuit board main. Board 12,
An AV board 13, which is a video / audio circuit board, is arranged. Further, on the front case 5 side, a main exhaust fan 15 is arranged at a position corresponding to the lamp device 1, and an auxiliary exhaust fan 16 is arranged in the vicinity thereof. Further, although not shown, an intake fan is arranged near the ceiling intake port 24 and / or the bottom intake port 4A described above. In FIG. 7, reference numeral 400 denotes a housing (Mg or A in this example) that houses and holds each optical element that constitutes the optical unit 10.
It is made of metal such as l. In the following, referred to as a light guide), 910 is a cross dichroic prism for color light combination, 925RC, 925GC, 925BC.
Represents a cable extending from a liquid crystal panel (described later) as a light modulating means attached to the cross dichroic prism 910 and serving as light modulating means for red, green, and blue light.

The power supply unit 9 includes a first power supply block 9A arranged on the side of the projection lens 6 and a central space in the plane U-shaped optical system, that is, a space between the projection lens 6 and the lamp unit 1. Second power supply block 9 arranged in
B, a third power supply block 9C arranged on the side of the optical system on the light source lamp unit 8 side. The first power supply block 9A includes an AC inlet 40, and distributes and supplies the power from the external power supply obtained through the AC inlet 40 to the second power supply block 9B and the third power supply block 9C. The second power supply block 9B transforms the power obtained from the first power supply block 9A and supplies the transformed power mainly to the main board 12 constituting the control system. Also,
The second power supply block 9B is also used to drive the main exhaust fan 15 and the auxiliary exhaust fan 16. The third power supply block 9C transforms the power obtained from the first power supply block 9A and supplies it to the lamp device 1. Third
The power supply block 9C is larger than the first and second power supply blocks 9A and 9B and is arranged in front of and behind the outer case 2 because it is necessary to supply power to the lamp device 1 having the largest power consumption.

(3) Configuration of Optical Unit FIG. 8 is a configuration diagram showing an optical system of the projector according to the embodiment of the present invention. The configuration of the optical unit 10 will be described below with reference to FIG.

The optical unit 10 includes an illumination optical system 923,
Color light separation optical system 924, relay optical system 927, liquid crystal panels 925R, 925G, 925B as light modulating means,
Cross dichroic prism 91 for color light combination
0, the projection lens 6 and the like.

The illumination optical system 923 includes the lamp device 1 as the illumination light source described in the first embodiment and the liquid crystal panel 925.
First and second lens arrays 921 and 922 that form an integrator lens that illuminate the image forming areas of R, 925G, and 925B substantially uniformly, and a reflection mirror 931 (in the case of an arrangement configuration that does not change the traveling direction of illumination light). Is unnecessary)
And a superimposing lens 932.

The first lens array 921 has a structure in which small lenses 9211 having a substantially rectangular contour are arranged in a matrix of M rows and N columns. Each small lens 9211
Divides the parallel light beam incident from the light source into a plurality of (that is, M × N) partial light beams, and forms each partial light beam in the vicinity of the second lens array 922. Each small lens 92
The contour shape of 11 is the liquid crystal panel 925R, 925G,
It is set so as to be substantially similar to the shape of the image forming area of 925B. For example, if the aspect ratio (ratio of 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 has a configuration in which the small lenses 9221 are arranged in a matrix of M rows and N columns so as to correspond to the small lenses 9211 of the first lens array 921.

The color light separation optical system 924 is provided with two dichroic mirrors 941 and 942 and a reflection mirror 943, and the light emitted from the superposing lens 932 of the illumination optical system 923 is divided into three colors of red, green and blue. It has the function of separating into colored light. The relay optical system 927 is an optical path corresponding to the transmitted light from the dichroic mirror 942, and includes the incident side lens 9
54, relay lens 973, and reflection mirrors 971, 9
72 are provided.

Liquid crystal panels 925R, 925G, 925B
Is, for example, one using a polysilicon TFT as a switching element, and the cross dichroic prism 91
It is adhesively fixed to the cross dichroic prism 910 via a fixing member so as to face the three side surfaces 0.
In addition, incident side polarization plates 960R, 960G, 9 are provided on the light incident / exiting surface sides of the liquid crystal panels 925R, 925G, 925B.
60B, and an output side polarization plate 961 on the light output side.
R, 961G, and 961B are arranged, respectively.

The cross dichroic prism 910 is
A color image is formed by combining three color lights of red, green, and blue. A dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are composed of four rectangular prisms. The dielectric multi-layer film is formed in a substantially X shape along the interface, and the above three color lights are combined. The projection lens 6 is arranged on the exit surface side of the cross dichroic prism 910.

Next, the assembly structure of the optical unit 10 will be described with reference to FIG. In order to assemble the optical unit 10, first, the substantially box-shaped light guide 400 having at least one surface for positioning and holding the optical element is opened with its opening side facing upward, that is, the side which finally becomes the top surface is facing down. Put it in. Then, the lamp device 1 is inserted into the lamp device housing portion 401 of the light guide 400, and the screw fixing portions 210 and 211 are used to fix the lamp device 1 to the light guide 400 with screws 411 and 412 so as to be capable of heat conduction. The first air passage 213 and the second air passage 2 of the lamp device 1 are fixed at the position where the lamp device 1 is fixed to the light guide 400.
It is assumed that the side wall of the light guide 400 at a portion facing the intake / exhaust ports 15 is notched or has a vent hole having a size similar to those of the intake / exhaust ports.
In FIG. 7, reference numeral 1A is a connector portion of the lamp device 1 (corresponding to reference numeral 150 in FIG. 1).

Further, each optical element (various mirrors, various lenses, etc.) forming the illumination optical system 923, the color light separation optical system 924, and the relay optical system 927 is arranged inside the light guide 400, and these optical elements are arranged. It is fixed to the light guide 400 with the elastic clip 7 or the like. Further, liquid crystal panels 925R, 925G, 9 corresponding to red, green, and blue light are stored in the color light combining prism housing portion 402 of the light guide 400.
Cross dichroic prism 91 to which 25B is fixed
Fix 0. In this case, first, the cross dichroic prism 910 may be bonded and fixed to the resin prism fixing plate, and the prism fixing plate and the light guide 400 may be fixed with screws or the like. Finally, the light guide 4
The projection lens 6 is fixed to the head plate 403 of No. 00 with screws or the like.

As described above, the light guide 400 to which each optical element is attached is turned over so that each optical element is housed between the light guide 400 and the lower case 4, and then the light guide 400. The light guide 400 and the lower case 4 are fixed by screws or the like so as to be able to conduct heat by using the fixing portions 404, 405 and the like provided in the lower case 4 and the screw holes formed in the lower case 4.

(4) Operation of Optical Unit Next, the operation of the optical unit 10 will be described with reference to FIG. 8 again. The light emitted from the lamp device 1 is first an integrator lens (composed of 921 and 922).
to go into. The integrator lens converts the image of each lens cell of the first lens array 921 into the second lens array 92.
By forming an image on the liquid crystal display surface by the 2 and superimposing lens 932, it is possible to improve the utilization rate of light and to improve the uneven illumination. Then, the light emitted from the integrator lens enters the color light separation optical system 924 via the superimposing lens 932.

The first dichroic mirror 941 of the color light separation optical system 924 reflects the red light component of the luminous flux 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 enters the field lens 951 via the reflection mirror 943, and further reaches the liquid crystal panel 925R for red light. The field lens 951 converts each partial light flux emitted from the second lens array 922 into a light flux parallel to the central axis (chief ray) thereof. 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 liquid crystal panel 925G for green light. On the other hand, the blue light is the second dichroic mirror 942.
Liquid crystal panel 925B for blue light through the relay optical system 927, and further through the field lens 953.
Reach

The red, green and blue lights are emitted from the liquid crystal panel 925.
Upon entering the R, 925G, 925B, only specific polarized light is made by the incident side polarization plates 960R, 960G, 960B. Then, each polarized light is transmitted to each liquid crystal panel 925.
R, 925G, and 925B are modulated according to the image information given, and as the modulated light, the emission side light plate 961R,
It is emitted to 961G and 961B. This exit side polarization plate 9
In 61R, 961G, and 961B, only the specific polarized light of the modulated light is transmitted and is incident on the cross dichroic prism 910. Then, the color lights are combined by the cross dichroic prism 910 to be combined light,
It is projected as a color image on a projection screen or the like via the projection lens 6.

It is to be noted that a light beam including P-polarized light and S-polarized light from the lamp device 1 is polarized at a predetermined position of the illumination optical system 923, for example, between the second lens array 922 and the superposing lens 932. By disposing a polarization beam splitter that aligns the light beams, it is possible to use all the light from the lamp device 1 in the liquid crystal panels 925R, 925G, and 925B without wasting it.

(5) Cooling Structure of Projector Here, the cooling structure of the projector will be described.
In the projector according to the second embodiment, the cooling air is taken into the inside of the outer case 2 and the inside of the light guide 400 from the ceiling intake port 24 by using the intake fan arranged on the ceiling side near the cross dichroic prism 910. . This air is generated by the liquid crystal panels 925R, 925G, 92.
After cooling 5B and its periphery, the boards 12 and 13 are guided to the lamp device 1 side while cooling. Further, the air is supplied to the bottom suction port 4A provided on the bottom surface of the lower case 4A.
Along with the new cooling air taken in from the surroundings of the lamp device 1 and the first air passage 213 and the second air passage of the lamp device 1.
Flowing into the air passage 215 of the above to cool it. In addition, a part of these air flows on the second power supply block 9B side, and another part flows on the third power supply block 9C side to cool each power supply block. Then, the cooling air is exhausted from the exhaust port 34 to the outside of the outer case 2 by the exhaust fans 15 and 16. In addition to this, the heat generated in the lamp device 1 is conducted to the guide 400 via the fixing part between the lamp device 1 and the light guide 400, and the heat of the light guide 400 is transferred to the fixing part with the outer case 2. The heat is conducted to the outer case 2 through the heat dissipation. Therefore, in the projector of the second embodiment, in addition to the cooling performance similar to that described in the first embodiment regarding the cooling of the lamp device 1, the heat of the lamp device 1 is thermally conducted to the light guide 400, and the light is further emitted. The heat conduction from the guide 400 to the outer case 2 can improve the heat dissipation ability of the entire projector including the lamp device 1.

As shown in the side sectional view of the lamp device arrangement portion in FIG. 10, an air passage is provided between the bottom surface of the lamp device 1 fixed to the light guide 400 and the lamp lid 4B constituting the outer case 2. It is preferable to form 60. By doing so, the air that has flowed into the side of the lamp device 1 also passes through the air passage 60, so that the air-cooling area of the lamp device 1 can be increased, and the air passage 60 extends from the lamp device 1 to the lamp cover. Since it has a buffering effect on the heat transfer to 4B, it is possible to suppress the temperature of the lamp lid 4B from being particularly high compared to other portions. In addition, the lamp device 1 is provided on the side of the lamp device 1 facing the lamp device 1 and the outer case 2.
The heat cushioning material having a lower heat emissivity than the material of the housing 200 is arranged, and the heat cushioning material 70 having a higher heat reflectivity than the material of the lamp lid is provided on the lamp lid 4B constituting the exterior case 2 at the opposite portion. When used together with the arrangement, the lamp lid 4
It is possible to more effectively suppress the temperature of the part B from becoming particularly higher than that of the other parts. The thermal buffer material 70 may be arranged on the lamp device 1 side.

FIG. 11 is an explanatory view showing another example of the cooling structure in the projector according to the embodiment of the present invention. The arrow in the figure indicates the direction of air flow. Figure 1
1, the air flow A flowing from the outside of the outer case is introduced into the light guide 400 in the vicinity of the color / light combining prism storage portion 402 for the respective liquid crystal panel ventilation holes 408a, 40.
8b, 408c, liquid crystal panel 925R,
After cooling 925G, 925B and its surroundings, and further guiding the air to the lamp device 1 side to cool the lamp device 1, an air flow C is provided from the vent hole 406 near the lamp device housing 401 to the outside of the light guide 400. Exhausting.
This point is the same as the cooling structure described above. Here, the vent hole 407 of the light guide 400 is further provided near the second lens array (near the polarization beam splitter when the polarization beam splitter is provided). And
From the color light combining prism housing portion 402 to the lamp device housing portion 4
A part of the air flow toward 01 is exhausted as an air flow B out of the light guide 400 through the vent hole 407 so as to cross the optical path of the light emitted from the lamp device 1. The air flow B acts to suppress the flow of heat from the lamp device 1 toward the liquid crystal panel, and thus the influence of heat generation of the lamp device 1 on the liquid crystal panel or the like is reduced. In addition,
In FIG. 11, reference numeral 409 is a circular hole corresponding to the projection lens.

The present invention is based on the above embodiment.
Fixing the reflector 120 and the housing mounting frame 140, fixing the housing mounting frame 140 and the housing 200, fixing the housing 200 and the glass plate 300, fixing the housing 200 and the light guide 400, and the light guide 400 and the outer case 2. The fixing of the lower case 4 and the lamp cover 4B with each other is not limited to the method described above, and screws, caulking, engagement, fitting,
It can be performed by various fixing methods such as adhesion or a combination thereof.

In the above embodiment, a so-called three-plate type projector provided with three liquid crystal panels has been described.
It may be a single-plate type projector. Further, although the liquid crystal panel is used as the light modulator of the projector, the projector may be provided with a light modulator including a device panel using a plasma element other than liquid crystal and a micromirror. Further, the liquid crystal panel as the light modulating means is a transmissive type that transmits and modulates each of red, green and blue light fluxes, but is a reflective type that modulates and emits incident light while reflecting it. May be

[0047]

According to the present invention, the heat dissipation ability of the lamp device or the equipment using it is improved, and the safety and reliability of those equipment and devices are improved. In addition, the improvement of the heat dissipation capability enables downsizing of the lamp device or a device using the lamp device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a lamp unit that constitutes a lamp device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a method of assembling the lamp unit and the housing that constitute the lamp device according to the embodiment of the present invention.

FIG. 3 is a perspective view of the lamp device according to the embodiment of the present invention as viewed from the back side.

FIG. 4 is a front view of the lamp device shown in FIG.

FIG. 5 is an external view of the projector according to the embodiment of the present invention as seen from the top surface direction.

FIG. 6 is an external view of the projector according to the embodiment of the invention as viewed from the bottom surface direction.

FIG. 7 is a mounting view of the inside of the projector according to the embodiment of the present invention as seen from the top surface direction.

FIG. 8 is a configuration diagram showing an optical system of the projector according to the embodiment of the invention.

FIG. 9 is a perspective view showing an assembled state of optical elements that form an optical unit of the projector according to the embodiment of the invention.

FIG. 10 is a side sectional view showing an arrangement state of the lamp device and the outer case in the projector according to the embodiment of the invention.

FIG. 11 is an explanatory view showing another cooling structure in the projector according to the embodiment of the invention.

[Explanation of symbols]

1… Lamp device 2 ... Exterior case 3 ... Upper case 4 ... Lower case 4A ... Bottom inlet 4B ... Lamp cover 5 ... Front case 10 ... Optical unit 60 ... Air passage between bottom of lamp unit and lower case 70 ... Thermal shock absorber 100 ... Lamp unit 110 ... Lamp 120 ... Reflector 140 ... Housing mounting frame 200 ... Housing 206 ... Reflector holder 207 ... Glass plate storage groove 213 ... the first wind path 215 ... The second wind path 300 ... Glass plate 400 ... Light guide

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 21/16 F21M 7/00 L // F21Y 101: 00 1/00 A (72) Inventor Yoshiyuki Yanagisawa Nagano 3-5 Yamato 3-chome, Suwa Prefecture, Japan Seiko Epson Corporation F-term (reference) 3K014 LA01 LB03 LB04 3K042 AA01 AB02 AC06 BB01 BC01 CC04 CC05 CC10

Claims (18)

[Claims] 1. A lamp and a lamp unit having a curved reflector that reflects light emitted from the lamp in a predetermined direction and one end of which is open, and a light-transmissive plate member that protects the lamp and the reflective surface of the reflector. A first holding unit that holds the lamp unit and the housing that holds the light-transmissive plate member, and that communicates with the outside of the housing between the opening end of the reflector and the light-transmissive plate member.
The air conditioner is arranged, and the lamp unit and the light-transmissive plate member are opposed to each other through the air passage. 2. The lamp unit has a housing mounting portion for fixing to the housing on an outer peripheral portion of an opening side of the reflector, and the housing receives the housing mounting portion and holds the lamp unit. 2. The lamp device according to claim 1, further comprising: a lamp unit holding portion that holds the light-transmitting plate material; and a plate material holding portion that receives and holds the light-transmissive plate material. 3. The lamp device according to claim 2, wherein the housing mounting portion includes a rib that receives and supports and fixes an opening-side outer peripheral end portion of the reflector. 4. The lamp device according to claim 3, wherein the rib supports a half or more of an outer circumference of the reflector on the opening side. 5. The lamp according to claim 3, wherein a flat portion having a shape in which a part of the outer peripheral portion is cut off is provided on an outer peripheral portion on the opening side of the reflector, and the flat portion is opposed to an inner surface of the rib. apparatus. 6. The lamp device according to claim 1, wherein a second air passage communicating with the outside of the housing is arranged between the housing mounting portion and the rear wall of the housing. 7. The lamp device according to claim 6, wherein each of the first air passage and the second air passage includes an intake / exhaust port formed in a side wall of the housing. 8. The intake and exhaust ports forming the first air passage,
The lamp device according to claim 7, which is smaller than an intake / exhaust port that constitutes the second air passage. 9. The lamp device according to claim 1, wherein the housing is made of metal. 10. The lamp device according to claim 9, wherein surface treatment is performed on the inner surface of the housing so that the heat absorption rate of the inner surface of the housing is higher than that of the metal itself. 11. The lamp device according to claim 9, wherein the outer surface of the housing is subjected to a surface treatment for increasing the heat emissivity of the outer surface of the housing more than the heat emissivity of the metal itself. 12. The ignition voltage of the lamp is set to 1
The lamp device according to claim 1, wherein the lamp device has a voltage of 0 KV or less. 13. A projector comprising the lamp device according to claim 1 as an illumination light source inside an outer case. 14. The projector according to claim 14, wherein the projector includes a metal housing that holds an optical element that constitutes an optical system,
14. The projector according to claim 13, wherein the lamp device is fixed to the metal housing so as to be able to conduct heat by using the housing thereof. 15. The projector according to claim 13, wherein an air passage is formed between the lamp device and the outer case. 16. The projector according to claim 15, wherein a thermal buffer material having a lower thermal emissivity than a housing of the lamp device is arranged on a lamp device side of a portion facing the lamp device and the outer case. 17. The projector according to claim 15, further comprising a heat cushioning material having a higher heat reflectance than that of the outer case, which is disposed on an outer case side of a facing portion between the lamp device and the outer case. 18. The air flowing across the emitted light is introduced into the optical path of the emitted light from the lamp device.
The projector according to any one of 1 to 17.