JPH0559424U - LCD projector - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an exhaust method for cooling a light source of a liquid crystal projector which does not give a viewer a trouble due to light leakage from a light source and hot air due to exhaust air. [Structure] An exhaust fan 8 for cooling a light source 2 constituting an optical unit 1 is arranged on the same surface as a surface on which a front cylinder portion of a projection lens 7 is arranged, and a projection direction 1 of the projection lens 7 is arranged.
0 and the exhaust direction 11 of the exhaust fan 8 for cooling the light source 2 have the same direction. As a result, an exhaust method is provided for cooling the light source of the liquid crystal projector, which does not leak the light from the light source 2 to the viewer and does not give the viewer the trouble caused by the hot air due to the exhaust air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal projector for enlarging and projecting on a screen by a projection lens using a liquid crystal display plate.

[0002]

[Prior Art]

 4 and 5 are configuration diagrams showing the liquid crystal projector disclosed in Japanese Patent Laid-Open No. 64-74585, and FIG. 6 is a configuration diagram also shown in Japanese Patent Laid-Open No. 1-2302387. FIG. 1 is a configuration diagram showing a liquid crystal projector that has been conventionally implemented. In the figure, 1 is an optical unit, 2 is a light source constituting the optical unit 1, 3 is also an optical unit 1, and white light from the light source 2 is split into three kinds of colored light of red, green and blue. A dichroic mirror 4 also constitutes the optical unit 1, and a reflection mirror for reflecting the dispersed color light. Reference numeral 5 also constitutes the optical unit 1, and a liquid crystal display plate for transmitting the color light reflected by the reflection mirror 4 separately. , 6 is a dichroic prism which also constitutes the optical unit 1 and synthesizes the spectrum transmitted through the liquid crystal display plate 5, 7 is a projection lens which constitutes the same optical unit 1 and magnifies and takes an image of the color light synthesized by the dichroic prism 6, 8 is an exhaust fan used for cooling the light source 2, 9 is a screen on which the image is projected, 10 is a projection direction from the projection lens 7, and 11 is an exhaust fan 8. Exhaust direction.

FIG. 8, FIG. 9, and FIG. 10 are usage state diagrams showing a state of projection using a liquid crystal projector having the configuration shown in FIGS. 4 to 5, 6, and 7. In the figure, 9 is a projected screen, 10 is the projection direction from the projection lens 7, 11 is the exhaust direction of the exhaust fan 8, 12 is a liquid crystal projector, 13 is the front cylinder of the projection lens 7, and 14 is a screen 9 A viewer watching the image projected on the screen, 15 is the line of sight of the viewer 14. The liquid crystal projector 12 shown in FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, and FIG. 10 is a floor-standing stationary type. The structural example related to the design frame is omitted.

Next, the operation configuration of the conventional liquid crystal projector will be described. 4 to 5, FIG. 6 and FIG. 7 are configuration diagrams showing a conventional liquid crystal projector. In the figure, the white light from the light source 2 is split by the dichroic mirror 3 into three kinds of color light of red, green, and blue, and the split color light is reflected by each reflection mirror 4. The configuration as an optical unit 1 in which the reflected color lights are separately transmitted to the liquid crystal display panel 5, the transmitted spectrum is combined by the dichroic prism 6, and the combined color lights are enlarged and projected by the projection lens 7. Is commonly shown in each figure.

4 to 5, the color light projected from the projection lens 7 of the optical unit 1 shown above in the projection direction 10 shown in the figure is enlarged and projected onto the screen 9. At the time of this magnified projection, the light source 2 constantly emits light and therefore generates heat. Therefore, for cooling the light source 2, the light is emitted to the rear part of the optical unit 1, that is, the rear surface of the projection lens 7 opposite to the projection direction 10. An exhaust fan 8 is arranged to forcibly exhaust the air in the optical unit 1 in the exhaust direction 11 shown in the figure to cool the light source 2 by air.

In FIG. 6, the color light projected from the projection lens 7 of the optical unit 1 shown above in the projection direction 10 shown in the figure is enlarged and projected onto the screen 9. Since the light source 2 always emits light during this magnified image pickup, heat is generated. Therefore, the top surface of the optical unit 1 for cooling the light source 2, that is, the direction perpendicular to the projection direction 10 of the projection lens 7 is The exhaust fan 8 is disposed on the surface, and the light source 2 is air-cooled by forcibly exhausting the air in the optical unit 1 in the exhaust direction 11 shown in the figure.

In FIG. 7, the color light projected from the projection lens 7 of the optical unit 1 shown above in the projection direction 10 shown in the figure is enlarged and projected on the screen 9. At the time of this magnified projection, the light source 2 is always emitting light and therefore generates heat. Therefore, for cooling the light source 2, the side surface of the optical unit 1, that is, the direction perpendicular to the projection direction 10 of the projection lens 7 is set. The exhaust fan 8 is disposed on the surface, and the air in the optical unit 1 is forcibly exhausted in the exhaust direction 11 shown in the figure to cool the light source 2 by air.

FIG. 8, FIG. 9, and FIG. 10 are usage state diagrams showing a state of projection using the liquid crystal projector 12 having the configuration shown in FIGS. 4 to 5, 6, and 7. 8 and 10 show a state where the liquid crystal projector 12 is used for projection as seen from above, and FIG. 9 shows a side view.

In FIG. 8, the color light projected from the front tube portion 13 of the liquid crystal projector 12 is enlarged and projected on the screen 9 in the projection direction 10, and is exhausted in the exhaust direction 11 shown in the drawing to be discharged into the liquid crystal projector 12. Is cooled. Further, the viewer 14 is viewing the image enlarged and projected on the screen 9 in such a manner as to include the liquid crystal projector 12.

In FIG. 9, similarly, the color light projected from the front tube portion 13 of the liquid crystal projector 12 is enlarged and projected on the screen 9 in the projection direction 10, and is exhausted in the exhaust direction 11 shown in the drawing to be the liquid crystal projector. The inside of 12 is cooled. Further, the image enlarged and projected on the screen 9 is viewed with the line of sight 15 as if the screen 9 is seen through the exhaust direction 11 of the liquid crystal projector 12.

In FIG. 10 as well, similarly, the color light projected from the front tube portion 13 of the liquid crystal projector 12 is enlarged and projected on the screen 9 in the projection direction 10, and is exhausted in the exhaust direction 11 shown in the figure to be discharged to the liquid crystal projector 12. The inside is cooled. Further, the viewer 14 is viewing the image enlarged and projected on the screen 9 in such a manner as to surround the liquid crystal projector 12.

In addition, in FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, and FIG. 10, in order to make the operational configuration of the liquid crystal projector 12 easy to understand, another configuration example of the entire design frame body relationship is shown. Since it is omitted, the description of the operation configuration is omitted.

[0013]

[Problems to be solved by the device]

 The conventional exhaust method for cooling a liquid crystal projector is as described above. Since it is an exhaust method for cooling a light source, it is possible to completely suppress the leakage of white light or spectrally colored light from the light source. This is not possible, and because the heat generated by the light source is exhausted, the exhaust air is hot air, which makes the viewers around the LCD projector hot air, and light leaks from the light source making it difficult to see the image. There were problems such as.

The present invention has been made to solve the above problems, and even when viewed around the liquid crystal projector, the viewer is exposed to the hot air due to the exhaust air and the image due to light leakage. The purpose is to obtain a liquid crystal projector that has an exhaust method for cooling the light source without difficulty.

[0015]

[Means for Solving the Problems]

 In the liquid crystal projector according to the present invention, the exhaust fan for cooling the light source is arranged on the same surface as the surface on which the front cylinder of the projection lens is arranged, and the combined color light projected from the front cylinder of the projection lens is projected. The projection direction and the exhaust direction of the exhaust fan for cooling the light source are the same.

[0016]

[Action]

 By setting the projection direction of the projection lens of the present invention from the front cylinder part and the exhaust direction of the exhaust fan to be the same direction, the viewer can see the light leakage of the light source in the horizontal, rear, and upward directions of the liquid crystal projector. Also, it is not necessary to suffer from a defect due to hot air from exhaust air.

[0017]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are block diagrams showing a liquid crystal projector according to the present invention. In the figure, 1 is an optical unit, 2 is a light source forming the optical unit 1, 3 is also the optical unit 1, and a dichroic mirror that splits white light from the light source 2 into three types of colored light of red, green and blue. Reference numeral 4 denotes a reflection mirror that constitutes the same optical unit 1 and reflects the spectrally colored light. Reference numeral 5 denotes a liquid crystal display plate that also constitutes the optical unit 1 and transmits the color light reflected by the reflection mirror 4 separately. Reference numeral 6 is a dichroic prism which also constitutes the optical unit 1 and synthesizes the spectrum transmitted through the liquid crystal display plate 5. Reference numeral 7 is a projection lens which also constitutes the optical unit 1 and magnifies and projects the color light synthesized by the dichroic prism 6. Is an exhaust fan used for cooling the light source 2, 9 is a screen to be projected, 10 is a projection direction from the projection lens 7, and 11 is an exhaust fan 8. It is a gas direction.

FIG. 3 is a use state diagram showing a state of projection using the liquid crystal projector having the configuration shown in FIGS. 1 and 2. In the figure, 9 is a projected screen, 10 is the projection direction from the projection lens 7, 11 is the exhaust direction of the exhaust fan 8, 12 is a liquid crystal projector, 13 is the front cylinder of the projection lens 7, and 14 is the screen 9. It is a viewer who is watching the projected image. The liquid crystal projector 12 shown in FIGS. 1, 2, and 3 is a floor-standing type, and other structural examples related to the design frame are omitted in order to facilitate understanding of the operational configuration.

Next, the operation configuration will be described. 1 and 2 are block diagrams showing a liquid crystal projector according to the present invention. In the figure, the white light from the light source 2 is split into three kinds of color light of red, green and blue by the dichroic mirror 3, and the split color light is reflected by each reflection mirror 4. The reflected color lights are separately transmitted to the liquid crystal display plate 5, the transmitted spectra are combined by the dichroic prism 6, and the combined color lights are enlarged and projected by the projection lens 7 as an optical unit 1. Commonly shown in each figure.

In FIG. 1, the color light projected from the projection lens 7 of the optical unit 1 shown above in the projection direction 10 shown in the figure is enlarged and projected on the screen 9. At the time of this magnified projection, the light source 2 always emits light and therefore generates heat. Therefore, the light source 2 is cooled in the same direction as the front direction of the optical unit 1, that is, the projection direction 10 of the projection lens 7. The exhaust fan 8 is disposed on the surface, and the air inside the optical unit 1 is forcibly exhausted from the side surface of the light source 2 in the exhaust direction 11 shown in the figure to cool the light source 2 by air.

In FIG. 2, the color light projected from the projection lens 7 of the optical unit 1 shown above in the projection direction 10 shown in the figure is enlarged and projected on the screen 9. At the time of this magnified projection, the light source 2 always emits light and therefore generates heat. Therefore, the light source 2 is cooled in the same direction as the front direction of the optical unit 1, that is, the projection direction 10 of the projection lens 7. The exhaust fan 8 is disposed on the surface, and the air inside the optical unit 1 is forcibly exhausted from the rear portion of the light source 2 in the exhaust direction 11 shown in the figure to cool the light source 2 by air.

FIG. 3 is a use state diagram showing a state in which the liquid crystal projector 12 having the configuration shown in FIGS. 1 and 2 is used for projection, as viewed from above. In FIG. 3, the color light projected from the front tube portion 13 of the liquid crystal projector 12 is enlarged and projected on the screen 9 in the projection direction 10, and is exhausted in the exhaust direction 11 shown in the figure, that is, in the same direction as the projection direction 10. The inside of the liquid crystal projector 12 is cooled. Also, the viewer 14 is viewing the image enlarged and projected on the screen 9 in such a manner as to surround the liquid crystal projector 12. In this way, when the liquid crystal projector 12 is viewed, the air is exhausted from the front surface of the liquid crystal projector 12 without the viewer 14, that is, the surface having the front tube portion 13 of the projection lens 7. It should be noted that, in FIG. 1, FIG. 2, and FIG. 3, other structural examples related to the design frame are omitted in order to make the operational configuration of the liquid crystal projector 12 easier to understand, and therefore the description of the operational configuration is omitted.

Example 2. In addition, in the above-described embodiment, the case of the stationary type liquid crystal projector has been described, but the liquid crystal projector may be used in a ceiling-mounted type liquid crystal projector, and the same effect as that of the above-described embodiment is obtained.

[0024]

[Effect of the device]

 As described above, according to the present invention, the exhaust fan for cooling the light source is arranged on the same surface as the surface on which the front tube portion of the projection lens is arranged, and the projection direction and the exhaust direction are set in the same direction. This makes it possible to obtain a liquid crystal projector that has an exhaust method for cooling the light source that does not cause image glitches due to light leaks when the viewer is exposed to hot air even when viewing around the LCD projector. effective.

[Submission date] May 7, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

[Industrial applications]

This invention relates to a liquid crystal Bro GETS Kuta for enlarging and projecting on a screen at a projection lens with a liquid crystal display panel.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006] In FIG. 6, the color light projected onto the projection Direction 10 shown in FIG from the projection lens 7 of the optical unit 1 shown above is enlarged and projected onto the screen 9. During this expansion projected shadow, the light source 2 is always exothermic since the emission, and therefore, the top surface of the optical unit 1 as a light source 2 cooling, i.e. perpendicular way towards the projection direction 10 of the projection lens 7 The exhaust fan 8 is disposed on the surface of the light source 2 and the air in the optical unit 1 is forcibly exhausted in the exhaust direction 11 shown in the figure to cool the light source 2 by air.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

[Problems to be solved by the device]

Exhaust method for cooling of a conventional liquid crystal projector have been made as described above, white light from the light source for an exhaust for the cooling of the light source, or completely suppress it the light leakage of the spectral color light In addition, since the heat generated by the light source is exhausted, the exhaust air becomes hot air, which causes the viewer to be exposed to hot air and the light leaking from the light source makes it difficult to see the image. There were problems such as.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

FIG. 3 is a use state diagram showing a state of projection using the liquid crystal projector having the configuration shown in FIGS. 1 and 2. In the figure, the screen is projected 9, 10 projecting direction from projection morphism lens 7, 11 an exhaust direction of the exhaust fan 8, 12 a liquid crystal projector, 13 front cylinder portion of the projection lens 7, 14 screen 9 a viewer watching a projected shadow video to. The liquid crystal projector 12 shown in FIGS. 1, 2, and 3 is a floor-standing stationary type, and other structural examples related to the design frame are omitted in order to make the operational configuration easy to understand.

[Brief description of drawings]

FIG. 1 is a block diagram showing a liquid crystal projector according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a liquid crystal projector according to an embodiment of the present invention.

FIG. 3 is a use state diagram showing a state in which the liquid crystal projector according to the embodiment of the present invention is used.

FIG. 4 is a configuration diagram showing a conventional liquid crystal projector.

FIG. 5 is a configuration diagram showing a conventional liquid crystal projector.

FIG. 6 is a configuration diagram showing a conventional liquid crystal projector.

FIG. 7 is a configuration diagram showing a conventional liquid crystal projector.

FIG. 8 is a use state diagram showing a state in which the liquid crystal projector is used by using the conventional liquid crystal projector.

FIG. 9 is a state of use diagram showing a state in which the conventional liquid crystal projector is used.

FIG. 10 is a use state diagram showing a state in which the conventional liquid crystal projector is used.

[Explanation of symbols]

 2 light source 5 liquid crystal display plate 7 projection lens 8 exhaust fan 9 screen 10 projection direction 11 exhaust direction 12 liquid crystal projector 13 front cylinder part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 9/31 Z 8943-5C

Claims (1)

[Scope of utility model registration request] 1. A liquid crystal display plate that separates white light from a light source into three types of color light of red, green, and blue, and transmits the separated color lights separately, and transmits the liquid crystal display plate. In a liquid crystal projector that synthesizes colored light and projects it on a screen by a projection lens in an enlarged manner, an exhaust fan for cooling a light source is arranged on the same surface as the surface on which the front cylinder of the projection lens is arranged, and the above-mentioned synthesis is performed. A liquid crystal projector in which the projection direction of colored light and the exhaust direction are the same.