JPH11271880A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector device small in size and capable of improving a heat radiation effect by providing a heat radiating case in which a video display member and an optical system are enclosed and house and which totally radiates inside heat to the outside. SOLUTION: A duct part 33 is formed of space formed by the upper cover 22a of the case 4 and a lower cover 22b provided at the lower part of a base plate corresponding to the upper cover 22a. Air current generated by the driving of a fan 10 rises as shown by an arrow, and takes away the heat from optical parts such as respective liquid crystal light valves 6a to 6c and deflecting plates 30a to 30c heated by the illumination of a light source. After cooling down the heat taken away, the air current advances to the duct part 33. The air current having the heat comes in contact with the covers 22a and 22b made of material whose heat conductivity is high such as metal forming the duct part 33, so that the entire cover becomes a heat radiating plate and the air current is cooled. The cooled air current is made to raise by the fan 10 again and submitted to cooling the respective optical parts of the optical system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a projector device capable of projecting an image on a projection target such as a screen by using light from a light source to display an image.

[0002]

2. Description of the Related Art In recent years, with the spread of multimedia devices and computers, a display device having a large screen is required. In recent years, a liquid crystal projector device including an image display member such as a liquid crystal display panel and optical components such as a light source and a projection lens has been widely used as a television receiver or a display device for presentation using a computer. .

For example, a liquid crystal projector device using three liquid crystal display panels has R, G, B (red light, red light, and red light) emitted from a light source such as a metal halide lamp or a halogen lamp.
(Green light, blue light) is polarized to a plane of polarization using a polarization separation block, and then decomposed for each of R, G, and B colors by an optical element such as a dichroic mirror. The luminous flux of each color enters a liquid crystal display panel corresponding to each color, modulates the light, and combines them by a dichroic block to obtain RGB light as a color image as output light. Then, the synthesized color image is projected on a screen by a projection lens.

In such a liquid crystal projector device, in order to prevent the temperature of the liquid crystal light valve, various optical components, and the like from becoming high due to the heat of the light source, a device for cooling them is devised. As shown in FIG. 9, a closed case 4 in which outside air is not introduced into one of the cooling methods of this optical block and is isolated from outside air.
There is a closed cooling type in which the air inside is circulated by a fan 10. Since the sealed case is insulated from the outside air, there is no need for components to prevent dust from entering the optical block and space for installing these components.This increases design flexibility and reduces the size of the device. Can be planned. Since there is no dust on the optical components in the optical block,
The reflection efficiency and the transmission efficiency of light are improved, and the illumination light of the light source can be used efficiently. Since fan noise can be reduced, a low-noise projector can be provided. There were merits such as.

[0005]

However, the closed case 4
Since the material of the upper cover 22a and the lower cover 22b is made of a material having poor heat dissipation, the heat conduction plate 34 and the heat pipe 35 need to be arranged in the closed case 4, and the heat dissipation Fins 36 were required. The heat radiation effect is determined by the arrangement and size of the heat conductive plate 34 and the heat pipe 35, and the size of the heat radiation fins 36. In particular, since the heat radiation fins are arranged outside the closed case 4, the size of the heat radiation fins is secured while maintaining the size. Interference with parts must be avoided, and the shape tends to be complicated. Also, due to these heat dissipation effects, a certain amount of air is required,
The size of the sealed case is determined according to the amount of air, and there is a limit to miniaturization. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a projector device which is small in size and can enhance a heat radiation effect.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to irradiate a light source and light from the light source to an image display member.
An optical system for displaying an image by projecting the transmitted light of the image display member onto a projection target by a projection lens, and enclosing and housing the image display member and the optical system to radiate the heat inside as a whole to the outside. The heat dissipation case is achieved by a projector device.

In the present invention, the optical system irradiates the light of the light source to the image display member, and projects the transmitted light of the image display member onto the projection target by the projection lens to display an image. The heat radiating case hermetically seals the image display member and the optical system, and radiates the heat generated therein to the outside as a whole. Thereby, the internal heat generated from the vicinity of the image display member and the optical system can be entirely radiated to the outside using the heat radiation case. Thus, it is not always necessary to separately attach a large fin to the outside, so that downsizing can be achieved and heat dissipation can be improved.

In the present invention, preferably, the heat radiation case is made of a metal, particularly a metal having high thermal conductivity, so that heat generated in the vicinity of the image display member or the optical system which is housed in a sealed state is efficiently radiated to the outside. can do. In the present invention, preferably, the heat dissipation case has a waveform forming portion for enlarging the surface area, so that the heat dissipation case can have a larger surface area and the heat dissipation efficiency can be increased.

In the present invention, preferably, the radiation fins are provided on at least one side inside or outside the radiation case, so that the radiation efficiency can be further increased.

In the present invention, preferably, if a pipe having high thermal conductivity through which outside air can pass is arranged in the heat radiation case, the heat radiation characteristics of the heat radiation case can be further improved.

In the present invention, preferably, a heat radiation case can be further heightened by disposing a heat radiation fin with respect to this pipe. As described above, in the present invention, it is possible to secure the hermeticity of the heat radiation case, prevent dust from entering the inside, reduce fan noise, and enhance heat radiation.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 shows a preferred embodiment of a projector device according to the present invention. The projector device is arranged in, for example, a rear projection television set of a liquid crystal system or directly displays an image on a screen. Can be adopted for those capable of projecting.

The projector device 100 is a so-called three-panel type liquid crystal projector device. As shown in FIG. 1, the liquid crystal projector device 100 according to the present invention is provided on a substrate 1 installed in a casing (not shown). A light source 2 and an optical block 3 are provided. The optical block 3 is provided below the substrate 1 with respect to the optical block case 4, a lid 21 for closing the upper side of the optical block case 4, an upper cover 22 a located in front of the optical block 3, and the upper cover 22 a. The optical component is sealed inside the lower cover 22b. A drive circuit 8 for driving a liquid crystal display panel (liquid crystal light valve) as an image display member is provided above the lid 21. The upper cover 22a is detachable, and when the upper cover 22a is removed, registration adjustment of the liquid crystal light valve (adjustment of superposition of images) can be performed.

The optical block 3 has, for example, an optical system 70 having a configuration as shown in FIG. 2, and the operation thereof will be described. Illumination light formed by a light source 2 such as a metal halide lamp passes through a cut filter 23 that blocks ultraviolet and infrared rays, lens eyes 24a and 24b, and a condenser lens 26, and a first dichroic that separates and reflects red illumination light. The light enters the mirror 27a. The red illumination light R color-separated by the first dichroic mirror 27a is
The light is polarized by the reflection mirror 28a, passes through the condenser lens 29a and the polarizing plate 30a, and passes through a red liquid crystal light valve (image display member) 6a driven based on a red image signal supplied from the drive circuit 8.

The green and blue illumination light beams GB transmitted through the first dichroic mirror 27a are incident on the second dichroic mirror 27b and the green illumination light G is color-separated. The separated green illumination light G passes through the condenser lens 29b and the polarizing plate 30b, and drives a green liquid crystal light valve (image display member) 6b that is driven based on a green image signal supplied from the drive circuit 8. To Penetrate.

The blue illumination light B transmitted through the second dichroic mirror 27b passes through a relay lens 31a, a reflection mirror 28b, a relay lens 31b and a reflection mirror 28c, passes through a condenser lens 29c and a polarizing plate 30c, and is driven. The light passes through the blue liquid crystal light valve 6b (video display member) driven based on the blue video signal supplied from the circuit 8. The light transmitted through the liquid crystal light valve 6a for red, the liquid crystal light valve 6b for green, and the liquid crystal light valve 6c for blue are combined in color by the combining prism 5, expanded by the projection lens 32, and projected onto a predetermined screen. Projected.

As shown in FIG. 3, the upper cover 2 of the case 4
A duct portion 33 is formed by a space formed by 2a and a lower cover 22b provided below the substrate 1 corresponding to the upper cover 22a. The upper cover 22a and the lower cover 22b are made of a material having a high thermal conductivity such as a metal.

Next, a method for cooling optical components in the projector apparatus 100 of the present invention will be described. In FIG. 3, the airflow generated by driving the fan 10 rises as shown by the arrow, and the liquid crystal light valves 6a, 6b, 6c and the polarizing plates 30a, 30b, 3 heated by the illumination of the light source 2.
Heat is taken from the optical components such as 0c, and after cooling them, the process proceeds to the duct portion 33. The airflow having heat is in contact with the upper cover 22a and the lower cover 22b made of a material having high thermal conductivity such as a metal forming the duct portion 33, so that the entire cover becomes a heat sink and is cooled. The cooled airflow is again raised by the fan 10 and the optical system 70
For cooling each optical component. The cooling of the optical component is continued by utilizing the airflow circulation.

When it is desired to reduce the enclosed space in the case and cool the optical components and the light valve of the optical system 70 with less airflow, the upper cover 22a and the lower cover 22b as shown in FIG. Make the outside of the
By providing the corrugated portion 120 to increase the surface area,
As shown in (5), the heat radiation fins 36 may be mounted at positions where they do not interfere with components outside the upper cover 22a and the lower cover 22b. In order to further enhance the heat radiation effect, FIG.
As shown in FIG. 7, one or more cooling pipes 37 through which outside air passes are provided in the closed case 4. At this time,
When the fins 38 are provided on the outer periphery of the cooling pipe 37 as shown in FIG. 8, the heat radiation effect can be further enhanced. In the embodiment of the present invention described above, the material of the closed case 4 is
It is made of metal materials such as iron, aluminum, stainless steel and copper, which have excellent thermal conductivity. It is preferable to provide a waveform forming portion 120 on the outer shape of the case 4 to increase the surface area of the case 4. By disposing it on at least one of the inside and outside of the case 4 or the outside thereof (although it is the outside in FIG. 5), the heat radiation capability of the case 4 can be further enhanced.

As shown in FIGS. 6 and 7, for example, a metal pipe 37 having excellent heat radiation to the case 4 is provided, and the outside air is passed through the pipe. Can improve the heat dissipation. This pipe 37
On the other hand, if the fins 38 as shown in FIG. 8 are provided, the heat dissipation can be further improved. In any case, in the embodiment of the present invention, by combining one or more of these embodiments, the heat radiation of the closed case is enhanced, and the required air in the case is reduced, whereby the closed The size of the case 4 can be reduced, and the size of the projector device 100 can be reduced while having the advantage of a sealed structure. In other words, the case 4 having the sealed structure can prevent dust and the like from entering the optical component light valves constituting the optical system 70 in the case 4 and can reduce noise of the fan 10. Thus, a low-noise projector device can be provided.

As described above, various optical elements such as lenses and liquid crystal light valves for red, green and blue as image display members can be sealed and cooled. The sealed case 4 is made of, for example, a metal having a high heat dissipation property and has a structure with a high heat dissipation property, so that the size of the projector device can be reduced while having the merits of the closed cooling method.

Incidentally, the present invention is not limited to the above embodiment. In the projector device of the above-described embodiment, three so-called three-panel liquid crystal light valves for red, green, and blue are used. However, the present invention is not limited to this, and a type using one light valve is also available. Can be adopted. When one light valve is used, it can be used for color display or black and white display.

The embodiment of the projector device of the present invention is also used as a so-called rear projection type projector device which is arranged in, for example, a television receiver and projects onto the screen of the television receiver from the rear side. However, it can also be used as a direct front projection type projector device that projects an image directly on a screen.

[0025]

As described above, according to the present invention,
It is small and can enhance the heat radiation effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a projector device of the present invention.

FIG. 2 is a diagram showing an example of the internal structure of the projector device.

FIG. 3 is a diagram illustrating an optical system, an image display member, and the like disposed in a case.

FIG. 4 is a diagram showing another embodiment of the projector device of the present invention.

FIG. 5 is a diagram showing still another embodiment of the projector device of the present invention.

FIG. 6 is a perspective view showing still another embodiment of the projector device of the present invention.

FIG. 7 is a diagram showing an internal structure of the projector device of FIG.

FIG. 8 is a view showing another embodiment of the pipe of the projector device of FIG. 7;

FIG. 9 is a diagram showing a structural example of a conventional projector device.

[Explanation of symbols]

100: Projector device, 2: Light source, 4 ...
A case, 6a, 6b, 6c: a light valve (video display device); 70, an optical system; 120, a waveform forming unit; 36, a radiating fin; 37, a radiating pipe; 38 fins for heat radiation.

Claims (6)

[Claims] A light source, an optical system that irradiates light from the light source to an image display member, and projects an image transmitted by the image display member onto a projection target by a projection lens to display an image; A radiation device, comprising: a heat-radiating case that hermetically accommodates an optical system and entirely radiates internal heat to the outside. 2. The projector according to claim 1, wherein the heat radiating case is made of metal. 3. The projector device according to claim 1, wherein the heat radiation case has a waveform forming portion for enlarging the surface area. 4. The projector device according to claim 1, further comprising a radiating fin on at least one of an inner side and an outer side of the radiating case. 5. The projector device according to claim 1, wherein a pipe having high heat conductivity through which outside air can pass is disposed in the heat radiation case. 6. A radiating fin is arranged on a pipe.
3. The projector device according to claim 1.