KR100363348B1 - Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same - Google Patents

Abstract

The liquid crystal projector includes an illumination optical system including a light source, a color separation optical system for separating the illumination light from the illumination optical system into three colors of light, a cross dichroic prism disposed at a light incidence end of the projection lens, the projection lens, and the cross dichroic. A projection lens unit having a plurality of liquid crystal panels arranged to surround the prism, a power source for a light source, and a projection lens unit, a color separation optical system, an illumination optical system, and a power source in this order, and the planar appearance The dimension is 263 mm x 318 mm or less. The display surface of the liquid crystal panel is 0.9 inches. In addition, a cooling fan for cooling the plurality of liquid crystal projectors is provided on the side surface of the projection lens.

Description

Liquid Crystal Projector, Projection Lens Unit, Optical Unit, Cooling System {LIQUID CRYSTAL PROJECTOR, AND PROJECTION LENS UNIT, OPTICAL UNIT AND COOLING SYSTEM FOR THE SAME}

The present invention provides a liquid crystal projector for irradiating light from a light source to three liquid crystal panels and projecting the output light of the three liquid crystal panels onto a screen with a projection lens to display an image, and a projection lens unit, an optical unit, and cooling used therein. Relates to a device.

Conventionally, as a liquid crystal projector using three liquid crystal panels, it is disclosed by Unexamined-Japanese-Patent No. 6-289392, for example. The liquid crystal projector of the prior art includes a light source, a cold mirror, a dichroic mirror for B (blue light) reflection, a dichroic mirror for G (green light) reflection, an upper reflection mirror, a liquid crystal panel for R (red light), a liquid crystal for G Panel, a liquid crystal panel for B, a dichroic prism for synthesis, and a projection lens, and the light from the light source is transmitted and reflected by a cold mirror, a B reflection dichroic mirror, and a G reflection dichroic mirror. Through each of the three colors of R, G, and B, they are guided to each liquid crystal panel by reflection of each of the reflection mirrors, and the image of each color component transmitted through each liquid crystal panel is synthesized by a dichroic prism. The image is magnified and projected by the projection lens.

In such a conventional liquid crystal projector, three 1.3-inch liquid crystal panels are used, so that a small set size and detailed display are possible. Such a liquid crystal projector has already been commercialized.

In addition, in the above-mentioned liquid crystal projector, the cooling apparatus is used in order to suppress the temperature rise of a liquid crystal panel.

1 is a side view of a conventional liquid crystal projector. As shown in the figure, in the conventional liquid crystal projector, the axial cooling fan 81 is disposed below the liquid crystal panels 14 and 18 to suppress the temperature rise of the liquid crystal panels 14 and 18. In such a configuration, since the wind from the cooling fan 81 directly touches the liquid crystal panels 14 and 18, the liquid crystal panels 14 and 18 can be easily cooled. In this liquid crystal projector, three liquid crystal panels are used, and two liquid crystal panels 14 and 18 are shown. The other liquid crystal panel is arranged on the rear side of the liquid crystal panel 14, and the figure is shown. Omit. In the drawing, reference numeral 27 denotes a projection lens.

The plane dimension of the liquid crystal projector using three 1.3-inch liquid crystal panels does not include the projection portion (the portion where the projection lens protrudes from the housing), but the external dimension is 245 mm × 329 mm. The outer dimension in the case of including the projection is 245 mm x 380 mm. At the time of storage and transportation, the miniaturization of the external dimension including the projection of the projection lens is a problem.

Therefore, the inventors conducted a content review on the miniaturization in order to realize miniaturization as compared with the conventional liquid crystal projector. As a result, in a liquid crystal projector using three liquid crystal panels, it is necessary to reduce the size of the liquid crystal projector to be set to an external dimension that can be used for a storage shelf and a carrying case which are generally widely used as the minimum external dimensions suitable for storage and transportation. Got.

In addition, in the conventional liquid crystal projector shown in FIG. 1, the overall height dimension of the apparatus is the height dimension L2 added to the height dimension of the projection lens 27 and portions of the liquid crystal panels 14 and 18 shown in FIG. do. Moreover, in this structure, the space (invalid space) which is hard to utilize effectively arises below the projection lens 27, and the height dimension of the whole apparatus becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to propose a liquid crystal projector having an external dimension that can use a storage shelf or a carrying case which are widely used.

Another object of the present invention is to provide a liquid crystal projector suitable for reducing the height dimension and miniaturizing the device.

Still another object of the present invention is to provide a projection unit and an optical unit effective for miniaturization of a liquid crystal projector.

Another object of the present invention is to provide a cooling device of a liquid crystal projector with good efficiency.

1 is a side view of a conventional liquid crystal projector.

Fig. 2 is a plan view showing a first embodiment of a liquid crystal projector according to the present invention.

3 is a plan view for explaining a projection of a liquid crystal projector according to the present invention;

4 is a plan view showing a second embodiment of a liquid crystal projector according to the present invention;

Fig. 5 is a plan view showing a third embodiment of a liquid crystal projector according to the present invention;

6 is a plan view showing a fourth embodiment of a liquid crystal projector according to the present invention;

FIG. 7 is a side view around the liquid crystal panel of the liquid crystal projector shown in FIG.

Fig. 8 is a perspective view of a cooling device of the liquid crystal projector shown in Fig. 6;

9 is a perspective view of a cooling device of the liquid crystal projector shown in FIG.

FIG. 10 is a lower perspective view of the cooling device of the liquid crystal projector shown in FIG. 6;

Fig. 11 is a plan view showing a fifth embodiment of a liquid crystal projector according to the present invention;

Fig. 12 is a plan view showing a sixth embodiment of a liquid crystal projector according to the present invention;

<Explanation of symbols for the main parts of the drawings>

1: discharge lamp

14, 18: liquid crystal panel

27: projection lens

28: exhaust fan

29: housing

31: lamp light source

32: handle

46: suction fan

In order to achieve the object of the present invention, the projector of the present invention has a flat external dimension of approximately A4 pile dimension or less. This A4 pile size is 263 mm x 318 mm. The liquid crystal projector color-separates the light from the light source and irradiates the first liquid crystal panel, the second liquid crystal panel, and the third liquid crystal panel, and colors the light emitted from the first liquid crystal panel, the second liquid crystal panel, and the third liquid crystal panel. Composite and project onto the screen with the projection lens. This planar external dimension is the dimension of the housing forming the shell of this liquid crystal liquid crystal projector. In addition, this planar external dimension may be the dimension of the housing which forms the outer shell of this liquid crystal liquid crystal projector, and the protrusion part from a housing. In addition, the display screen sizes of the first, second, and third liquid crystal panels are 0.9 inches or less. In addition, the distance from the liquid crystal panel display surface disposed substantially perpendicular to the optical axis of the projection lens to the projection lens tip is approximately 146 mm or less. Moreover, a cross dichroic prism is provided as a color combining optical system which performs color synthesis, and the plane dimension of a cross dichroic prism is 32 mm x 32 mm or less.

The liquid crystal projector according to the present invention includes a color separation optical system including a first dichroic mirror, a second dichroic mirror, a first mirror, a second mirror, and a third mirror around a cross dichroic prism, a light source, An illumination optical system including a polarization conversion element and an optical integrator means, a power source for a light source, a projection lens unit including a plurality of liquid crystal panels, a cross dichroic prism, and a projection lens, the projection lens unit; The color separation optical system, the illumination optical system, and the power source for the light source were arranged in this order.

In addition, the liquid crystal projector according to the present invention includes a color separation optical system including a first dichroic mirror, a second dichroic mirror, a first mirror, a second mirror, and a third mirror around a cross dichroic prism; And a projection lens unit including an illumination optical system including a light source, a polarization conversion element, and an optical integrator means, a power source for the light source, a plurality of liquid crystal panels, a cross dichroic prism, and a projection lens. The unit, the set of color separation optical systems, the illumination optical system, and the power source for the light source were arranged in this order. In addition, an exhaust fan is installed near the light source. A side surface of the projection lens is provided with a cooling fan and a blowing duct for guiding cold air from the cooling fan to the first, second, and third liquid crystal panels.

The projection lens unit according to the present invention includes a projection lens, a cross dichroic prism disposed on a light incident side of the projection lens, first, second, and third liquid crystal panels, and the second liquid crystal panel for projecting the second liquid crystal panel. Means for enclosing the cross dichroic prism with the first, second and third liquid crystal panels to be substantially perpendicular to the optical axis of the lens, wherein the distance from the liquid crystal panel display surface to the projection lens tip is approximately 146; Mm or less. The planar dimension of this cross dichroic prism is 32 mm x 32 mm or less.

The optical unit according to the present invention includes an illumination optical system including a light source, a color separation optical system for separating illumination light from the illumination optical system into three colors of light, and a first light into which three colors of light separated by the color separation optical system are incident. And a second and third liquid crystal panel and a cross dichroic prism for synthesizing light from the first, second and third liquid crystal panels, the display screen of the first, second and third liquid crystal panels The size is 0.9 inches or less. The planar dimension of this cross dichroic prism is 32 mm x 32 mm or less.

The liquid crystal projector according to the present invention includes a first cooling circulation system having a closed ventilation path including a liquid crystal panel, and a second cooling circulation system for cooling the ventilation path from the outside in the device envelope, and the liquid crystal panel is provided with a first cooling circulation system. Cooling was performed directly in the cooling chamber, and indirect cooling was performed in the second cooling circulation system. This first cooling circulation system is provided with a dedicated cooling fan. This liquid crystal projector has a planar outline dimension of approximately A4 pile size or less.

The liquid crystal projector according to the present invention has a plurality of cooling fans for cooling the liquid crystal panel, at least one of which is disposed on the side of the projection lens. One of the plurality of cooling fans is a dedicated cooling fan for cooling the liquid crystal panel. This dedicated cooling fan has a cooling passage to the liquid crystal panel, and the cooling passage is divided into a plurality of passages. The plurality of divided cooling air passages increase the wind speed or the air volume of the plurality of liquid crystal panels to the green light liquid crystal panel. One of these cooling fans is a centrifugal fan.

The cooling device according to the present invention includes a plurality of liquid crystal panels, a cooling fan, a blower for blowing the cooling fluid from the cooling fan to the plurality of liquid crystal panels, and a plurality of liquid crystal panels, A plurality of guides for controlling the amount of air or wind speed is provided. This guide portion controls the air volume or the wind speed of the other liquid crystal panel to be higher than that of one liquid crystal panel among the plurality of liquid crystal panels. This fan is provided from the cooling fan to the plurality of liquid crystal panels. This blower blows the said cooling fluid from below of the said several liquid crystal panel upwards. The blower may be formed to return from the cooling fan back to the cooling fan through the plurality of liquid crystal panels.

The projection lens unit according to the present invention includes a projection lens, a cross dichroic prism disposed at an optical incidence end of the projection lens, and first, second and third liquid crystal panels arranged to surround the cross dichroic prism; A cooling fan disposed on a side surface of the projection lens, a cooling path for blowing the cooling fluid from the cooling fan to the first, second, and third liquid crystal panels, and installed in the blowing path. And a plurality of guide parts for controlling the air volume or the wind speed to the second and third liquid crystal panels.

The optical unit according to the present invention comprises an illumination optical system including a light source, a color separation optical system for separating the illumination light from the illumination optical system into three colors of light, a cross dichroic prism, and a cross dichroic prism to surround the The first, second and third liquid crystal panels arranged, a cooling fan, a blowing path for blowing the cooling fluid from the cooling fan to the first, second and third liquid crystal panels, and the blowing path And a plurality of guide portions provided in the first and second and third liquid crystal panels for controlling the air flow rate or the wind speed.

Moreover, in the cooling apparatus of this invention, it was set as the structure which can control the air volume and the wind speed freely so that the temperature rise of each liquid crystal panel may be the lowest in a some liquid crystal panel to a some liquid crystal panel.

Moreover, the air volume and the wind speed to each liquid crystal panel were made to the maximum air volume, and the wind speed to a green light liquid crystal panel, and the air volume and the wind speed to a red light liquid crystal panel were made the minimum.

The above and other objects, features and advantages of the present invention will become apparent from the description of the preferred embodiments with reference to the accompanying drawings.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described using drawing.

Fig. 2 is a plan view showing a first embodiment of a liquid crystal projector according to the present invention.

The illumination light 2 from the discharge lamp 1 which is a light source passes through the parabolic lamp reflector 3, the lens 4, and the lens 5, and the polarization conversion element 6, the first lens array 7, and the mirror ( 8) and incident on the dichroic mirror 10 via the second lens array 9. The dichroic mirror 10 transmits red light (R color light) 11 and reflects green light and blue light (G and B color light) 12. The R color light 11 is reflected by the mirror 13 and is incident on the R color light liquid crystal panel 14. The G and B color light 12 is incident on the dichroic mirror 15 which reflects the G color light and transmits the B color light, the G color light 16 is reflected to the mirror 15, and the B color light 17 is This mirror 15 penetrates. Thus, the G color light 16 is incident on the G color liquid crystal panel 18.

The B color light 17 is reflected by the mirror 19 and the mirror 20 and is incident on the B color light liquid crystal panel 21.

The R transmitted light 22 from the liquid crystal panel 14, the G transmitted light 23 from the liquid crystal panel 18, and the B transmitted light 24 from the liquid crystal panel 21 are applied to the cross dichroic prism 25. Color-synthesized, and the color-synthesized output light 26 is projected on a screen (not shown) by the projection lens 27.

In order to prevent the heat generated from the light source (discharge lamp 1) becoming a high temperature from affecting components other than the light source, an exhaust fan for cooling the light source (near the discharge lamp 1 and the lamp reflector 3) 28 is disposed, and exhausts the hot air 30 to the outside of the housing 29 of the liquid crystal projector. In addition, a lamp power source 31 is disposed in the vicinity of the discharge lamp 1. Also, outside air is introduced into the housing 29 by the intake fans 46 and 47. In the drawings, 48 and 49 are connectors, 54 are electrical components, and 55 are circuit boards.

In this embodiment, the color separation optical system including the first dichroic mirror 10, the second dichroic mirror 15, the first mirror 13, the second mirror 19, and the third mirror 20. Is arranged around the cross dichroic prism 25. An illumination optical system for improving utilization efficiency of illumination light from a light source and obtaining uniform illumination light includes a discharge lamp 1, a lamp reflector 3, a lens 4, a lens 5, and polarized light as a light source. The conversion element 6 and the 1st lens array 7 which is an optical integrator means, the mirror 8, and the 2nd lens array 9 are included. In addition, a lamp power source 31, which is a power source for a light source, is provided adjacent to the discharge lamp 1.

In this embodiment, the projection lens 27, the cross dichroic prism 25, the color separation optical system, the illumination optical system, and the lamp power supply 31 are arranged in this order.

The configuration in which the projection lens 27 is accommodated in the housing 29 includes the projection lens 27 in the housing 29 so as not to provide a projection on the outside of the housing 29, and the projection lens 27. A part of) has a protrusion which protrudes from the housing 29. In the present Example, the plane dimension containing the protrusion part of the liquid crystal projector at the time of storing was made into the external dimension of about A4 file size or less. The external dimensions of the embodiment are 307 mm in depth and 230 mm in width. On the other hand, the external dimension of the conventional liquid crystal projector is about 245 mm x 329 mm when not including the projection, but the external dimension when including the projection of the projection lens is 245 mm x 380 mm.

In the above description, the word "protrusion part" of the liquid crystal projector is used. Hereinafter, the projection part of the liquid crystal projector will be described with reference to FIG.

3 is a plan view of a liquid crystal projector according to the present invention. Compared to the embodiment shown in FIG. 2, the liquid crystal projector shown in FIG. 3 is provided with a handle 32 in the housing 29, and a part of the projection lens 27 protrudes from the housing 29. different. When the handle 32 is grasped, the handle 32 can be pulled out to lift the liquid crystal projector. Since the handle 32 and the projection lens 27 protrude from the housing 29, they are collectively referred to as protrusions in the present invention.

In addition, the external dimension of the liquid crystal projector by this invention is not limited to this embodiment of FIG. 2, What is necessary is just an A4 file size. As a result of investigating various A4 file sizes, the smallest size was 230 mm x 307 mm in the present embodiment, but was slightly larger than that, and was 243 mm x 307 mm and the maximum size was 263 mm x 318 mm. Therefore, in this invention, as A4 file size, what is necessary is just 263 mm x 318 mm or less which is the largest size.

By configuring the external shape of the liquid crystal projector as in the embodiment shown in Fig. 2, this liquid crystal projector can be stored in a storage shelf or a carrying case which are generally widely used.

In addition, the smaller the size of the liquid crystal projector, the more difficult it is to realize, but there is an effect that it is possible to use more widely available storage shelves and carrying cases.

In order to realize this external dimension, in the present embodiment, the display screen sizes of the liquid crystal panels 14, 18, and 21 were 0.9 inches. The projection lens 27 and cross dichroic prism 25 can also be miniaturized by using a liquid crystal panel that is 0.9 inches and smaller than 1.3 inches of the display screen size of a conventional liquid crystal panel, and with this, the color separation optical system is also used. Could be miniaturized.

The distance from the liquid crystal panel surface to the projection lens in the conventional liquid crystal projector was 180 mm. In this embodiment, in order to realize A4 file size, the projection lens 27 from the display surface of the projection lens unit, that is, the liquid crystal panel 18, is realized. The distance to the tip was 135 mm. By setting this distance to 135 mm or less, the smallest A4 file size could be realized. Moreover, about larger A4 file size, you may make this distance 146 mm or less. This is because a large length dimension of the A4 file size is 318 mm, a small one is 307 mm, and the difference is 11 mm.

2 and 3, the distance from the display surface of the liquid crystal panel 18 to the tip of the projection lens 27 is set to 135 mm. The liquid crystal is changed by changing the position of the lamp light source 31. The distance from the display surface of the panel 18 to the tip of the projection lens 27 can be extended to 170 mm.

In the present embodiment, the cross dichroic prism 25 is provided as a color synthesizing optical system and the planar dimension of the cross dichroic prism 25 is set to 32 mm x 32 mm to realize the A4 file size. Since this dimension was 32 mm x 32 mm or less, the color separation optical system could be further miniaturized. On the other hand, the planar dimension of the conventional cross dichroic prism 25 was 43 mm x 37 mm.

In addition, although the depth example of the liquid crystal projector showed the structure example larger than the width dimension in this Example, this invention is not limited to this, The width dimension may be a structure larger than the depth dimension.

4 is a plan view showing a second embodiment of a liquid crystal projector according to the present invention. In the drawing, the illumination light 2 from the discharge lamp 1, which is a light source, has a parabolic lamp reflector 3, a lens 4, a lens 5, a polarization converting element 6, and a first lens array 7 The light is incident on the dichroic mirror 40 via the mirror 8 and the second lens array 9.

The dichroic mirror 40 reflects the R color light 41 and transmits the G and B color light 42. The R color light 41 is reflected by the mirror 13 and is incident on the R color liquid crystal panel 14. G and B color light 42 are incident on the dichroic mirror 15 of G color light reflection and B color light transmission, G color light 16 is reflected to the mirror 15, and B color light 17 is the mirror 15 Through). The G color light 16 is incident on the G color liquid crystal panel 18. The B color light 17 is incident on the B color light liquid crystal panel 21 via the mirror 19 and the mirror 20.

The R transmitted light 22 from the liquid crystal panel 14, the G transmitted light 23 from the liquid crystal panel 18, and the B transmitted light 24 from the liquid crystal panel 21 are applied to the cross dichroic prism 25. Color-synthesized, and the color-synthesized output light 26 is projected on a screen (not shown) by the projection lens 27.

In order to prevent the heat generated from the light source becoming a high temperature from affecting components other than the light source, an exhaust fan 43 for cooling the light source is disposed near the discharge lamp 1 and the lamp reflector 3, and the liquid crystal The hot air 45 is exhausted to the outside of the projector housing 14. In addition, outside air is introduced into the housing 44 by the suction fan 46. In addition, a lamp power source 31 is disposed in the vicinity of the discharge lamp 1.

The color separation optical system includes a first dichroic mirror 40, a second dichroic mirror 15, a first mirror 13, a second mirror 19, and a first dichroic prism 25 around the cross dichroic prism 25. 3 mirrors 20 are arranged. An illumination optical system for improving utilization efficiency of illumination light from a light source and obtaining uniform illumination light includes a discharge lamp 1, a lamp reflector 3, a lens 4, a lens 5, and polarized light as a light source. The conversion element 6 and the optical integrator means are provided, and the optical integrator means includes the first lens array 7, the mirror 8, and the second lens array 9. In addition, the lamp power supply 31 which is a power source for light sources is provided in the vicinity of the discharge lamp 1.

In the present embodiment, a set in which the projection lens 27, the cross dichroic prism 25, and the color separation optical system are set in one row, the illumination optical system, and the lamp power supply 31 are arranged in this order.

In the present embodiment, when the projection lens 27 is accommodated in the housing 44, the planar dimension of the housing itself is included, and when the projection lens 27 is provided outside the housing 44, the planar dimension including the projection is approximately A4 file size. It was set as the following external dimensions. The external dimensions of the embodiment are 230 mm in depth and 307 mm in width.

According to this embodiment, as in the first embodiment, it was possible to obtain a liquid crystal projector having an external dimension that can use a storage shelf and a carrying case which are widely spread.

In this embodiment, the projection lens 27 is housed in the housing 44, and the distance from the display surface of the liquid crystal panel 18 to the tip of the projection lens 27 can be sufficiently increased. There is an effect. In general, by increasing this distance, the degree of freedom in designing the projection lens is increased, and a higher performance projection lens unit can be obtained.

In addition, in the configuration where the width dimension is larger than the depth dimension, various layouts can be changed.

In the present embodiment, the distance from the display surface of the liquid crystal panel 18 to the tip of the projection lens 27 is 135 mm. However, by eliminating the concave portion of the right housing toward the drawing, the liquid crystal panel 18 The distance from the display surface to the tip of the projection lens 27 can be extended to 170 mm.

Fig. 5 is a plan view showing a third embodiment of a liquid crystal projector according to the present invention. The difference from the second embodiment shown in Fig. 4 is that while studying the layout of components such as the exhaust fan 50, the projection lens 27 is moved to the front side (right side toward Fig. 5) with respect to the housing 51. This is one of the shifted configurations. In order to prevent the heat generated from the light source becoming a high temperature from affecting components other than the light source, the exhaust fan 50 for cooling the light source is staggered horizontally in the vicinity of the discharge lamp 1 and the lamp reflector 3. The hot air 52 is exhausted outside the housing 51 of the liquid crystal projector.

According to this embodiment, an empty space can be made on the rear side of the housing 51 (the left side of the color separation optical system toward the drawing), and the freedom of layout design of circuit components, etc., becomes wider, and a higher performance and higher performance circuit There is an effect that can be obtained.

In this embodiment, the distance from the display surface of the liquid crystal panel 18 to the front end of the projection lens 27 is 135 mm, and the distance is extended to 170 mm by staggering the color splitter to the left toward the drawing. Can be.

FIG. 6 is a plan view showing a fourth embodiment of a liquid crystal projector according to the present invention, and FIG. 7 is a side view of the liquid crystal panel and cooling fan shown in FIG.

The fourth embodiment differs from the first embodiment shown in Fig. 2 in that a cooling device is provided. The cooling device installs a cooling fan 61 for cooling the liquid crystal panels 14, 18, 21 on the side of the projection lens 27, and blows the wind from the cooling fan 61 through the air blowing duct ( 14, 18, 21). This cooling apparatus is mentioned later using another figure.

Also in the fourth embodiment, the illumination light from the discharge lamp 1 as in the first embodiment passes through the illumination optical system and enters the color separation optical system. In this color separation optical system, the R color light 11 and the G color light 16 are applied. And B-color light 17 are separated and incident on the liquid crystal panels 14, 18, and 21, respectively. The R transmitted light 22, the G transmitted light 23, and the B transmitted light 24 from the respective liquid crystal panels 14, 18, and 21 are color synthesized by the cross dichroic prism 25, and the projection lens 27 By the screen (not shown).

In addition, an exhaust fan 28 for cooling the light source is disposed in the vicinity of the discharge lamp 1 and the lamp reflector 3 to exhaust the hot air 30 outside the liquid crystal projector housing 29. In addition, a lamp power source 31 is disposed in the vicinity of the discharge lamp 1. In addition, the projection lens 27, the cross dichroic prism 25, the color separation optical system, the illumination optical system, and the lamp power supply 31 are arranged in this order.

Also in this fourth embodiment, when the planar dimension of the housing 29 and the projection 29 are provided on the housing 29, the planar dimensions of the housing 29 and the projection are approximately the outer dimension of A4 file size or less. That is, the external dimension is 307 mm in depth and 230 mm in width.

In addition, in various A4 file sizes, since the maximum size is 263 mm x 318 mm, the external dimensions of the liquid crystal projector are set below this maximum size.

The liquid crystal projector of this embodiment can be stored in a storage shelf or a carrying case which are widely spread.

In order to realize this external dimension, in this embodiment, the display screen size of the liquid crystal panel is 0.9 inch. The projection lens 27 and the cross dichroic prism 25 can be miniaturized by using a liquid crystal panel that is 0.9 inches and smaller than 1.3 inches of the display screen size of a conventional liquid crystal panel. In addition, the color separation optical system can be miniaturized.

In this embodiment, a cooling fan 61 for cooling the liquid crystal panels 14, 18, 21, for example, a blower-type sirocco fan, is disposed in a space adjacent to the projection lens 27. And blowing air from the cooling fan 61 through the first to fourth blowing ducts (only the first blowing duct 65 and the third blowing duct 70 are shown in FIG. 6). , 21). In addition, a cooling heat sink 66 is provided in a part of the blowing duct.

As described above, in the present embodiment, the liquid crystal panels 14, 18, and 21 are cooled by using empty spaces adjacent to the projection lens 27, so that the external dimensions of the liquid crystal projector can be made within the A4 file size.

In this embodiment, the distance from the display surface of the liquid crystal panel 18 to the tip of the projection lens 27 is set to 135 mm in order to realize the A4 file size as in the first embodiment. For a larger A4 file size, this distance may be 146 mm or less.

In addition, also in this Example, the plane dimension of the cross dichroic prism 25 was 32 mm x 32 mm.

Moreover, also in this Example, the width dimension may be larger than the depth dimension.

Hereinafter, the cooling apparatus by this invention is demonstrated using FIG. 8, FIG. 9, and FIG. 8, 9 and 10 are perspective views showing one embodiment of the cooling apparatus according to the present invention, FIG. 8 is a perspective view from the direction of the illumination optical system, and FIG. 9 is a perspective view from the exit direction of the projection lens. 10 shows a perspective view seen from the back side of FIG.

Cooling fluid (containing air, other gases, and liquids) discharged from the cooling fan 61 is transferred to the liquid crystal panel through the first blower duct 65, as indicated by arrows 111 in FIGS. 8 and 10. 14, 18, 21). As shown in FIG. 10, a first guide plate 123, a second guide plate 124, and a third guide plate 125 are disposed in the first blowing duct 65, and the cooling fluid of arrow 111 is B. As shown in FIG. Cooling fluid 112 for color liquid crystal panel 14, Cooling fluid 113 for G color liquid crystal panel 18, Cooling for R color liquid crystal panel 21 (see Fig. 8). The liquid is divided into 114 and guided to each of the liquid crystal panels 14, 18, and 21, and the liquid crystal panels 14, 18, and 21 are cooled. In this configuration, by appropriately disposing the guide plates 123, 124, and 125, the air blowing amount to the liquid crystal panels 14, 18, 21 can be adjusted. In general, the first, second, and third guide plates 123, 124, and 125 have a cooling air 113 for the G color liquid crystal panel 18 having the highest temperature rise of the panel. If possible, next to the wind 114 of the cooling fluid 112 for the B color liquid crystal panel 14 having a high temperature rise and for the R color liquid crystal panel 21 for which the temperature rise is not so high. It is arranged so that the air volume or wind speed can be divided and blown. In this way, the temperature rise value of each liquid crystal panel 14, 18, 21 can be almost equalized. The cooling fluid flows in the directions of arrows 115 and 116 shown in FIG. 10 (through the guides 91 and 92 shown in FIG. 8 and the guide holes (not shown) for the liquid crystal panel 21 (liquid crystal panel 21). The same applies to ()), and the liquid crystal panels 14, 18, and 21 are cooled.

And the cooling fluid is radiated by the cooling heat sink 66 provided in the inner and outer walls of the 2nd blowing duct 101 via the 2nd blowing duct 101, as shown in FIG. The cooling fan 61 is returned to the cooling fan 61 via the duct 70 and the fourth blowing duct 71. In this configuration, the first to fourth blowing ducts 65, 101, 70, and 71 have a structure in which the liquid crystal panels 14, 18, 21 and the cooling fan 61 are sealed. As a result, it is possible to prevent the entry of dust from the outside, and to prevent dust from adhering to the screen of the liquid crystal panels 14, 18 and 21 and irradiating dust on the screen. In the present embodiment, the first to fourth blower ducts 65, 101, 70, and 71 are provided to have a hermetic cooling structure. However, the first blower 65 is not necessarily sealed. Just form. Even with such a configuration, by attaching a separate dust-proof glass on the liquid crystal panel surface, countermeasures against dust can be achieved.

In one embodiment of the cooling apparatus of the present invention, the cooling fluid from the cooling fan 61 is divided by the guide plates 123, 124, and 125. Instead of using the guide plate, the cooling fluid is divided into three pipes or the like. The same effect can be obtained even with the structure.

Fig. 11 is a plan view showing a fifth embodiment of a liquid crystal projector according to the present invention.

The fifth embodiment differs from the second embodiment shown in FIG. 4 in that a cooling device is provided. This cooling device installs a cooling fan 61 for cooling the liquid crystal panels 14, 18, 21 on the side of the projection lens 27, and blows the wind from the cooling fan 61 through the air blowing duct to the liquid crystal panel ( 14, 18, 21).

Also in the fifth embodiment, similarly to the second embodiment, the illumination light from the discharge lamp 1 is incident on the color separation optical system via the illumination optical system, and the R color light 41, the G color light 16, It is separated into B color light 17 and is incident on the liquid crystal panels 14, 18, and 21, respectively. The R transmitted light 22, the G transmitted light 23, and the B transmitted light 24 from the respective liquid crystal panels 14, 18, and 21 are color synthesized by the cross dichroic prism 25, and the projection lens 27 By the screen (not shown).

In addition, an exhaust fan 43 for cooling the light source is disposed in the vicinity of the discharge lamp 1 and the lamp reflector 3 to exhaust the hot air 45 to the outside of the housing 44 of the liquid crystal projector. In addition, a lamp power source 31 is disposed in the vicinity of the discharge lamp 1. Moreover, the set which arranged the projection lens 27, the cross dichroic prism 25, and the color separation optical system in a row, the illumination optical system, and the lamp power supply 31 are arrange | positioned in this order.

In the embodiment shown in Fig. 11, the cooling fan 61 is arranged on the side of the projection lens 27 as in the fourth embodiment. This basic configuration is the same as that shown in Figs. In this configuration, since the cooling fan 61 is disposed near the lamp reflector 3 and is easily affected by heat, it is necessary to arrange the heat insulating plate 60 or the like. The effect of reducing the dimension is the same as in the fourth embodiment.

As the liquid crystal projector, as shown in Fig. 11, including the projection lens 27, all parts are housed in the housing 44, and projections such as a part of the projection lens 27 and a handle, etc., are disposed outside the housing 44. In some cases, the planar dimension is an outer dimension of approximately A4 file size or less. The external dimensions of the examples are 230 mm deep and 307 mm wide. In addition, the planar dimension of the cross dichroic prism 25 is 32 mm x 32 mm. The distance from the display surface of the liquid crystal panel 18 to the tip of the projection lens 27 is 135 mm.

In this embodiment, as in the second embodiment, a storage shelf or a carrying case which are widely spread can be used.

In this embodiment, the projection lens 27 is housed inside the housing 44, and the distance from the display surface of the liquid crystal panel 18 to the tip of the projection lens 27 can be sufficiently increased. have. In general, by increasing this distance, the freedom of designing the projection lens is increased, and a higher performance projection lens can be obtained.

In addition, in the configuration where the width dimension is larger than the depth dimension, various layouts can be changed.

Next, a sixth embodiment of a liquid crystal projector according to the present invention will be described.

Fig. 12 is a plan view showing a sixth embodiment of a liquid crystal projector according to the present invention. The difference from the fifth embodiment is that the layout of components such as the exhaust fan 50 is studied to move the projection lens 27 forward with respect to the housing 51. In order to prevent the heat generated from the light source becoming a high temperature from affecting components other than the light source, the exhaust fan 50 for cooling the light source is alternately disposed in the vicinity of the discharge lamp 1 and the lamp reflector 3. The hot air 52 is exhausted to the outside of the housing 51 of the liquid crystal projector.

In the present embodiment, the cooling fan 61 is located on the side of the projection lens 27 and on the side opposite to the lamp reflector 3 so that the liquid crystal panels 14 and 18 are not affected by the heat from the lamp reflector 3. , 21) can be efficiently cooled. The cooling structures of the liquid crystal panels 14, 18, and 21 are inverted left and right in the fifth and sixth embodiments, but the basic structures are the same. The same effect can be obtained even when the blower fan is used as the exhaust fan 50 as indicated by 50A in FIG.

In addition, according to the present embodiment, an empty space can be formed on the rear side of the housing 51, so that the degree of freedom in layout design of circuit components and the like can be increased, and a high-performance and high-performance circuit can be obtained.

Also in this embodiment, the external dimensions of the liquid crystal projector are 230 mm in depth and 307 mm in width.

In addition, the planar dimension of the cross dichroic prism 25 is 32 mm x 32 mm. The distance from the display surface of the liquid crystal panel 18 to the tip of the projection lens 27 is 135 mm.

In any of the embodiments described above, the optical unit includes at least an illumination optical system and a color separation optical system. This optical unit also adds a liquid crystal panel and a cross dichroic prism. In addition, the projection unit is composed of a projection lens, a liquid crystal panel and a cross dichroic prism.

The present invention may be embodied in other forms within the spirit or central feature thereof. Accordingly, the above embodiments are merely illustrative and are not intended to limit the present invention, the scope of the present invention is limited by the appended claims rather than the description above, and all changes and equivalents falling within the scope of the claims. Water also belongs to the scope of the present invention.

As described above, according to the present invention, at least the planar dimension including the projections of the liquid crystal projector at the time of storing is set to an outer dimension of approximately A4 file size or less, and thus a storage shelf and a carrying case which are widely spread can be used.

Moreover, according to this invention, height dimension of a liquid crystal projector etc. is suppressed to the minimum, and size reduction of a flat external dimension also below A4 file size becomes possible.

In addition, a cooling device can be arranged in the saved space, and the plurality of liquid crystal panels can be efficiently cooled to approximately equal temperature in accordance with the amount of heat generated by the liquid crystal panel.

Claims (74)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete An illumination optical system including a light source, A color separation optical system for separating the illumination light from the illumination optical system into three colors of light; A projection lens unit having a projection lens, a cross dichroic prism disposed at an optical incidence end of the projection lens, first, second and third liquid crystal panels arranged to surround the cross dichroic prism; A power source for the light source, A cooling fan disposed on the side of the projection lens, A blowing path for guiding cooling air from the cooling fan to the first, second, and third liquid crystal panels; And a guide portion for constituting a plurality of air passages in the first, second, and third liquid crystal panels in the air passage. In a liquid crystal projector which irradiates light onto a liquid crystal panel and projects light from the liquid crystal panel onto a screen via a projection lens, A cooling fan provided on the side of the projection lens for cooling the liquid crystal panel, Has a cooling path for guiding the cooling wind from the cooling fan to the lower side of the liquid crystal panel, And the cooling fan is arranged in a range of a height direction substantially equal to that of the liquid crystal panel, the projection lens, and the cooling air path. In a liquid crystal projector which irradiates light to a plurality of liquid crystal panels and projects the light from the liquid crystal panel onto a screen via a plurality of prisms and projection lenses, A plurality of cooling fans including a dedicated cooling fan for cooling the liquid crystal panel, The dedicated cooling fan is disposed on the side of the projection lens, has a cooling air path to the plurality of liquid crystal panels, the cooling air path is divided into a plurality, and compared to one liquid crystal panel in the plurality of liquid crystal panels. A liquid crystal projector, which is configured to increase the wind speed or the air volume to the other liquid crystal panel. In a liquid crystal projector which irradiates light onto a liquid crystal panel and projects light from the liquid crystal panel onto a screen via a projection lens, A cooling fan provided on the side of the projection lens for cooling the liquid crystal panel, Has a cooling path for guiding the cooling wind from the cooling fan to the lower side of the liquid crystal panel, The cooling air passage extends from the cooling fan to the lower side of the liquid crystal panel, and the cooling air is configured to blow upward from the lower side of the plurality of liquid crystal panels. In a liquid crystal projector which irradiates light to a plurality of liquid crystal panels for red, green, and blue, and projects the light from the liquid crystal panel on a screen through a plurality of prisms and projection lenses, A plurality of cooling fans including a dedicated cooling fan for cooling the plurality of liquid crystal panels, The dedicated cooling fan is disposed on the side of the projection lens, has a cooling air path to the plurality of liquid crystal panels, the cooling air path is divided into a plurality, and is used for green light than the red light liquid crystal panels in the plurality of liquid crystal panels. A liquid crystal projector characterized by being configured to increase the wind speed or the amount of air flow into a liquid crystal panel. 70. The airflow fan of claim 69, wherein the cooling air path extends from the dedicated cooling fan to the lower side of the plurality of liquid crystal panels, and the cooling air from the dedicated cooling fan is configured to blow upward from the lower side of the plurality of liquid crystal panels. A liquid crystal projector characterized by. 70. A liquid crystal projector according to claim 69, wherein the planar outline dimension is 263 mm x 318 mm or less. A plurality of liquid crystal panels, a cooling fan, a blower for blowing cooling air from the cooling fan to the plurality of liquid crystal panels, and a plurality of blowers formed in the blower to control the air flow rate or wind speed to the liquid crystal panel. With a guide, And the guide portion is configured to increase the wind speed or the air volume of the other liquid crystal panel as compared with one of the plurality of liquid crystal panels. 73. The liquid crystal projector according to claim 72, wherein the blower path extends from the cooling fan to the lower side of the liquid crystal panel, and the cooling air is blown upward from the lower side of the liquid crystal panel. 73. The liquid crystal projector according to claim 72, wherein the planar outline dimension is 263 mm x 318 mm or less.