KR20100119096A - Image projecting apparatus - Google Patents

Abstract

PURPOSE: An image projection device, which secures the operating dependability of an image device, is provided to cool an imaging element by absorbing the heat generated in front of the imaging element and to uniformly reduce the temperature of the imaging element. CONSTITUTION: An image projection device comprises an image device(10), a heat radiating member(70), a pipe(82) and an heat absorbing member(90). An image projection device creates an image using the light from a light source. The heat radiating member is formed on the rear side of an imaging element. The pipe is connected to the heat radiating member for heat-transmission.

Description

Image Projecting Apparatus

The present invention relates to an image projection apparatus for displaying an image by magnifying and projecting an image onto a screen.

In general, an image projecting device is a display device that allows an image generated by an image device or the like to pass through a projection lens or the like to be displayed on a large screen. According to the method of displaying an image, such a projection projecting method may include a CRT (Cathode Ray Tube) projection method, an LCD (LCD) liquid crystal display (LCD) projection method, an LCoS (Liquid Crystal On Silicon) projection method, and the like. Digital Light Processing (DLP) projection methods.

The CALTI projection method is a method of projecting an image signal of an external device amplified in a CRT to a screen, and it is also called a beam projector. There are a CRT one tube and a CRT three tube type.

The LCD projection method uses the electro-optical properties of the liquid crystal in the display device. The light sources (red, green, and blue) from the lamps pass through the transmissive liquid crystal panel, and are then synthesized into one image through a polarizing prism and enlarged onto the screen. That's how it works.

The Elcos projection method uses a silicon wafer (LCoS) (reflective liquid crystal panel) chip that uses a silicon wafer instead of a glass at the bottom of a conventional liquid crystal display (LCD) device and forms an electronic circuit thereon. The red, green, and blue colors are reflected off the surface of the Elcos chip, then synthesized into a single image through a polarizing prism and projected onto the screen.

The DLP projection method uses a DMD (Digital Mirror Device) chip developed by Texas Instruments (TI) in the United States, and the light generated from the lamp passes through the color wheel and is reflected by the DM chip. This is how it is projected. The DM chip is a semiconductor optical switch in which a micro-drive mirror switches thousands of times per second to selectively reflect light, and each aluminum micromirror having a size of 16 μm formed in each unit cell of SRAM (Ststic Random Access Momory) is turned on or off. It has a slope of ± 10 °.

Since the image projecting device uses light, it emits more heat than general electronic devices. If the internal temperature becomes high due to inability to discharge the generated heat efficiently, the function of circuit components in the image projecting device decreases and malfunctions. It may cause a defect.

In particular, a device for generating an image using light emitted from a light source unit such as a DM chip (hereinafter, referred to as an 'image device') increases in temperature because it continuously reflects or passes light generated from the light source. It is very vulnerable to heat, so there is a limit to keep the temperature of a certain part below a certain temperature (in the case of DM chip, the temperature specification that ensures the operation reliability is specified below 65 ° C).

Since the image projecting device cannot be installed so that other components interfere with the path through which light passes, a heat radiating member that absorbs heat is provided on one surface of the image device together with a blowing fan to absorb heat only in a single direction.

However, when the heat dissipation member is provided on the rear surface of the image device, the front surface of the image device cannot be cooled, so that it is difficult to uniformly lower the temperature of the entire image device.

In particular, the front of the image device is located in front of the light source for emitting heat with light is located on one side of the image element is overheated more than the other side, the general heat dissipation member and blower fan to cool the relatively overheated portion It is difficult to form a structure.

Therefore, in order to lower the front temperature of the image device to a certain temperature, the air volume of the blower fan must be increased. As the air volume increases, the noise increases as well, and even if the air volume increases, the back temperature of the image device is significantly lowered. There was a problem that the temperature change is insignificant and the cooling efficiency is low.

An object of the present invention is to provide an image projection that can absorb the heat generated in front of the image element to cool the image element in three dimensions.

Another object of the present invention is to provide an image projection value that can lower the temperature of the image element almost uniformly.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

According to a feature of the present invention for achieving the above object, the present invention comprises an image element for generating an image using the light irradiated from the light source; A heat radiating member provided on a rear surface of the image device to radiate heat generated from the image device; At least one pipe that is heat transferably connected to the heat dissipation member; Located in front of the image element is configured to include a heat absorbing member provided to the heat transfer to the pipe.

The inside of the pipe is filled with a working fluid for transferring heat between the heat radiating member and the heat absorbing member.

Both ends of the pipe are located at different heights to transfer heat through convection depending on the temperature of the working fluid.

The heat absorbing member includes: a first heat absorbing member disposed closer to the light source than the image device to absorb heat generated from the front of the image device; And a second heat absorbing member provided between the first heat absorbing member and the heat radiating member to transfer heat.

The pipe may include a first pipe connecting the heat radiating member and the second heat absorbing member; And a second pipe connecting the second heat absorbing member and the first heat absorbing member in a state separated from the first pipe.

The first pipe is provided on one side of the heat dissipation member farthest from the light source and extends inclinedly to the second heat absorbing member, and the second pipe extends toward the other side of the heat dissipating member and is connected to the first heat absorbing member. do.

The first heat absorbing member and the second heat absorbing member are positioned between the image element and the projection lens assembly to which the image is projected.

The first heat absorbing member, the second heat absorbing member, and the pipe are provided to surround the synthesis system in which the image device is provided to synthesize an image.

The pipe is composed of a vacuum sealed tube provided with a porous material on its inner surface.

The pipe is a condensation unit for releasing heat energy by condensing the working fluid, which is a vapor, an evaporation unit for evaporating the working fluid in the longitudinal direction by receiving heat energy of a heat source, a passage of the working fluid, and a heat exchanger without heat exchange with the outside. It is configured to include a wealth.

The image device is provided to partition the synthesis system for synthesizing the image, and the heat absorbing member is in close contact is configured to further include a case for transferring heat.

The heat absorbing member may include: a first heat absorbing member disposed on a side surface of the case closest to the light source to absorb heat generated from the front of the image device; And a second heat absorbing member provided between the first heat absorbing member and the heat radiating member and provided on an upper surface of the case to transfer heat.

The first heat absorbing member and the second heat absorbing member, and the second heat absorbing member and the heat radiating member are connected to each other by a pipe filled with a working fluid for transferring heat therein.

One end of the pipe connected to the first heat absorbing member, the second heat absorbing member, and the heat radiating member is positioned at different heights.

The first heat absorbing member and the second heat absorbing member are positioned between the image element and the projection lens assembly on which the image is projected, and the first heat absorbing member, the second heat absorbing member, and the pipe are provided to surround the synthesis system. .

It is configured to further include a blowing fan provided in the heat radiating member for flowing air.

According to the present invention, the heat absorbing member connected to the heat dissipating member indirectly cools the front part of the image element which generates the most heat, thereby maintaining the operating temperature of the image element, thereby ensuring the operation reliability of the image element. There is.

In addition, according to the present invention, since the heat dissipation member and the heat absorbing member which are connected to each other by heat transfer, respectively cool the rear and the front of the image element three-dimensionally, the temperature distribution of the image element can be maintained uniformly with one blower fan. This has the effect of being improved.

Hereinafter, a preferred embodiment of an image projection apparatus according to the present invention having the configuration as described above will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view and a bottom view showing the front and rear configurations of a general image device, respectively.

As shown in these figures, the image element 10 serves to generate an image using light emitted from the light source unit. The light source unit generates a light or reflects light by itself.

The image device 10 is generically referred to as a device for generating an image according to an input signal by being used in a DLP projection method, an LCD projection method or an Elcos projection method, and in the present embodiment, in the DLP projection method, The DMD chip used will be described as an example. The DM chip generates an image by reflecting light irradiated from the light source unit by a number of micro-driven mirrors acting by a memory electrostatic field action.

Since the image device 10 generates an image by synthesizing light, heat due to light is additionally generated in addition to heat generated for its own operation. Since the heat generated continuously may damage the imaging device 10, a separate cooling means should be provided to maintain the temperature of the imaging device 10 below a predetermined temperature.

For example, in the case of the DM chip, the temperature at which the operation reliability is ensured is defined as 65 ° C or less, so that a certain portion of the temperature must be maintained below the specified temperature (temperature specification).

Therefore, the front and rear temperatures of the imaging device 10 should be kept lower than the prescribed temperature, and the part for measuring the temperature of the imaging device 10 is defined as the measuring unit 12. The measuring unit 12 includes a first measuring unit 14 and a second measuring unit 16 positioned on both sides of the front surface of the image element 10, and a third portion disposed on the rear surface of the image element 10. The measurement unit 18 can be divided.

For reference, the position of the measuring unit 12 is a specific part of the Texas Instruments (TI) manufacturing the DM chip to secure the operation reliability of the DM chip.

In general, since the cooling means is provided on the rear surface of the image device 10, the temperature of the third measuring unit 18 is easily maintained at a temperature lower than or equal to a prescribed temperature. Since it is difficult to provide the cooling means, the temperature of the first measuring unit 14 and the second measuring unit 16 is considerably higher than the temperature of the third measuring unit 18.

In addition, among the first measuring unit 14 and the second measuring unit 16 located on the front surface of the image device 10, the first measuring unit 14 positioned adjacent to the light source unit is arranged in the image device 10. This occurs most frequently and is the portion where the temperature measurement with the third measuring unit 18 is greatest.

As described above, in order to secure operational reliability of the imaging device 10, it is essential to lower the temperature of the measuring unit 12, and in particular, the first measuring unit 14 and the second measuring unit 16. It is important to keep the temperature at the specified temperature.

Hereinafter, a cooling structure of the image device for securing operational reliability of the image device will be described.

3 and 4 are perspective views showing the main components of the preferred embodiment of the image projection apparatus according to the present invention from different directions.

As shown in these figures, the image projection device forms an image from light 10, a light source 30 for irradiating light, a projection lens assembly 60 for projecting an image onto the screen, and And a heat dissipation member 70 and a heat transfer member 80 for cooling the image device 10.

The light source unit 30 may use a lamp or LED (LED, Light Emitting Doide) for generating light by receiving power. In the present embodiment, a lamp assembly 32 that generates light using a lamp will be described as an example.

The lamp assembly 32 includes a lamp (not shown) for emitting light (white light) and a lamp case for protecting the lamp. The lamp assembly 32 may be provided with a reflector for collecting light emitted from the lamp.

The lamp case may be provided with a blowing fan (not shown) and a duct (not shown) for cooling the heat generated by the lamp. The blower fan and the duct serve to guide the air passing through the lamp assembly 32 to the outside.

In addition, a color wheel assembly 40 is provided in a direction in which light is irradiated from the lamp assembly 32. The color wheel assembly 40 includes a color wheel 42 which is divided into red, green, and blue to rotate at high speed, and a motor (not shown) to drive the color wheel 42. It is composed.

The color wheel assembly 40 may be provided with a heat radiation fin and a blowing fan for cooling the motor. In addition, an ultraviolet cut filter may be provided between the lamp assembly 32 and the color wheel assembly 40 to remove ultraviolet rays from the light output from the lamp.

The color wheel 42 is formed in a disk shape having a predetermined diameter, and the disk is divided into red, green, blue, and the like. Therefore, the unpolarized light reflected by the reflector has one of red, blue, and green colors due to the color of the color wheel 42 located at the moment of condensing.

Light emitted from the lamp assembly by the reflector of the lamp is focused on the surface of the color wheel. The light focused on the color wheel is any one of red, blue, and green while passing through the color wheel.

In addition, a light tunnel assembly 44 is provided in a direction in which light travels in the color wheel assembly 40. The light tunnel assembly 44 is also referred to as a rod lens, and serves to uniformly make colored light passing through the color wheel 42.

The light tunnel constituting the light tunnel assembly 44 is formed by joining four long and thin bar mirrors facing each other. The light tunnel serves to make the brightness distribution uniform by reflecting light separated into red, green, and blue while passing through the color wheel assembly 40.

An illumination lens 46 is provided in a direction in which light travels in the light tunnel assembly 44. The illumination lens 46 condenses the light passing through the light tunnel assembly 44.

The light collected by the illumination lens 46 is reflected by the mirror 50 and the aspherical mirror 52 (see FIG. 4) and the like and is irradiated toward the image device 10. The image device 10 implements an image signal according to an external input as an image by light by switching an internal optical system.

The projection lens assembly 60 is provided in a path through which the light reflected from the imaging device 10 travels. The projection lens assembly 60 serves to enlarge and project the image provided from the imaging device 10 on the screen. The projection lens assembly 60 is configured by combining a convex lens and a concave lens for collecting or diverging light to form an optical image.

The image element 10 is provided with a heat radiating member 70. The heat dissipation member 70 is in close contact with the rear surface of the image element 10 and serves to cool the image element 10. The heat dissipation member 70 is preferably formed of a metal material having high thermal conductivity such as aluminum. A rear side of the heat dissipation member 70 is provided with a blowing fan (not shown) for flowing air to cool the heat dissipation member 70.

The heat dissipation member 70 includes a heat dissipation plate 72 and a plurality of heat dissipation fins 74. The heat sink 72 serves to expand the heat radiation area of heat generated from the image device 10. The heat sink 72 is provided on the rear surface of the image device 10 and mainly emits heat generated from the rear surface of the image device 10 to the outside.

The heat dissipation fins 74 protrude in a direction orthogonal to the heat dissipation plate 72 and are provided to be spaced apart by a predetermined interval to form a flow path of air. That is, the air flowing by the blower fan passes between the radiating fins 74 and absorbs heat.

On the other hand, the heat radiation member 70 is provided with a heat transfer member (80). The heat transfer member 80 absorbs heat generated in front of the image device 10. The heat transfer member 80 is made of a good thermal conductivity material, such as copper, stainless steel, titanium, aluminum.

The heat transfer member 80 includes at least one pipe 82 and a heat absorbing member 90. The pipe 82 is a heat pipe for energy recovery, and is connected to the heat dissipation member 70 so as to be capable of heat transfer. The pipe 82 serves to transfer heat between the heat dissipation member 70 and the heat absorbing member 90.

The inside of the pipe 82 is filled with a working fluid of a liquid required to transport heat. The working fluid filled in the pipe 82 transfers heat between the heat dissipation member 70 and the heat absorbing member 90.

The working fluid may be water, ethanol, acetone, ammonia, freon and the like. Both ends of the pipe 82 are provided at different heights so as to transfer heat through convection according to the temperature of the working fluid.

Since the working fluid changes in specific volume depending on the temperature, the high temperature working fluid rises and the low temperature working fluid descends. Therefore, when both ends of the pipe 82 are positioned at different heights, both ends of the pipe 82 have the same height. The working fluid is easier to circulate than it is located.

In addition, the pipe 82 may be a vacuum sealed tube provided with a porous material on its inner surface. At this time, the inner wall of the pipe 82 is provided with a thin layer (wick or wick) having a thickness of 1-2mm made of a porous material such as a metal net.

The pipe 82 comprises an evaporation part (side of the heat absorbing member) and a working fluid passage in which the working fluid evaporates heat energy of a heat source in a longitudinal direction thereof, and a heat insulating part without heat exchange with the outside, and a working fluid which is steam. It comprises a condensation part (heat radiating member side) which condenses and releases heat energy.

The working fluid of the pipe 82 is vaporized by absorbing heat from the heat absorbing member 90 side, and the vaporized working fluid is condensed from the heat radiating member 70 side to transfer heat. The working fluid condensed on the heat dissipation member 70 may be circulated in such a manner as to return to the heat absorbing member 90 by the capillary pressure difference generated at the interface of the porous material.

The heat absorbing member 90 is positioned in front of the image device 10 and is provided to be capable of heat transfer to the pipe 82. That is, the heat absorbing member 90 absorbs heat generated from the front of the image device 10 to lower the front temperature of the image device 10.

The heat absorbing member 90 is provided closer to the light source unit 30 than the image device 10 to absorb the heat generated from the front of the image device 10 and the first heat absorbing member 92. The second heat absorbing member 94 is provided between the heat absorbing member 92 and the heat radiating member 70 to transfer heat. The first heat absorbing member 92 and the second heat absorbing member 94 are positioned between the image element 10 and the projection lens assembly 60 on which the image is projected.

The first heat absorbing member 92 is provided adjacent to the first measuring unit 14 that generates the most heat in the image element 10, and thus generates the most heat generated by the first measuring unit 14. The second heat absorbing member 94 is disposed adjacent to the second measuring unit 16 of the image device 10 to absorb the most heat generated by the second measuring unit 16. .

In addition, the pipe 82 transfers the heat absorbed by the first heat absorbing member 92 and the second heat absorbing member 94 to the heat radiating member 70. The pipe 82 may include a first pipe 84 connecting the heat dissipation member 70 and the second heat absorbing member 94 and the second heat absorbing member in a state in which the pipe 82 is separated from the first pipe 84. 94) and a second pipe (86) connecting the first heat absorbing member (92).

That is, the first heat absorbing member 92 and the second heat absorbing member 94, and the second heat absorbing member 94 and the heat radiating member 70 are pipes filled with a working fluid for transferring heat therein ( 82) are connected to each other. One end of the pipe 82 connected to the first heat absorbing member 92, the second heat absorbing member 94, and the heat radiating member 70 is positioned at different heights.

The first pipe 84 is provided on one side of the heat dissipation member 70 farthest from the light source unit 30 to be inclined to the second heat absorbing member 94, and the second pipe 86 is dissipated. It extends to the other side of the member 70 is connected to the first heat absorbing member 92.

Figure 5 is a perspective view showing a state in which the case is mounted in the embodiment of the present invention.

As shown in this figure, the synthesis system for synthesizing the images by providing the image device 10 is partitioned by the case 98. The case 98 is made of a material having good thermal conductivity, and the heat absorbing member 90 is mounted to the case 98 to absorb heat.

That is, the first heat absorbing member 92 is provided on the side surface of the case 98 closest to the light source unit 30 to absorb heat generated from the front of the image element 10. The second heat absorbing member 94 is provided on an upper surface of the case 98 between the first heat absorbing member 92 and the heat radiating member 70 to absorb heat.

Accordingly, the first heat absorbing member 92, the second heat absorbing member 94, and the pipe 82 are provided to surround the synthesis system for synthesizing the images by being provided with the image device 10. ) To cool the front.

Hereinafter, the operation of the image projection apparatus according to the present invention having the configuration as described above will be described in detail.

First, the image output process will be described. Power is applied to the light source unit 30 to emit white light. The white light emitted from the light source unit 30 is collected by the color wheel assembly 40 to have one of red, green, and blue colors. In this case, the UV filter is mounted in front of the color wheel assembly 40 so that only visible light required by the system is output, thereby preventing other components from being damaged by UV light.

In addition, light passing through the color wheel assembly 40 is uniformized while passing through the light tunnel assembly 44 and then incident to the illumination lens 46. The light passing through the illumination lens 46 is reflected by the mirror 50 and the aspherical mirror 52 to be focused on the image device 10.

The image element 10 reflects the irradiated light, and the image reflected and synthesized by the image element 10 is enlarged and projected onto the screen through the projection lens assembly 60 to display a screen.

In this way, when heat is generated in the process of synthesizing the image by the imaging device 10, the heat radiation member 70 provided on the rear surface of the imaging device 10 absorbs heat from the back side of the imaging device 10. It will be released to the outside.

In addition, the first heat absorbing member 92 and the second heat absorbing member 94 provided in front of the image element 10 absorb the heat generated in front of the image element 10 and then the pipe 82. Through the heat transfer to the heat radiating member 70. In addition, the inside of the pipe 82 is provided with a different height of the both ends is a natural circulation of the working fluid according to the change in the volume is made to efficiently heat exchange between the hot portion and the cold portion.

In more detail, the first heat absorbing member 92 is provided to be closest to the light source unit 30 to cool the first measuring unit 14 of the image device 10 that generates the most heat. The second heat absorbing member 94 cools the second measuring unit 16 of the imaging device 10 and then cools the third measuring unit 18 of the imaging device 10. Heat exchange with the front and rear of the image device 10 can reduce the temperature difference.

That is, the heat dissipation member 70 may cool the rear surface of the image element 10, and the heat absorbing member 90 may cool the front of the image element 10. 10 may be cooled in various directions, and temperature deviations between the front and the rear of the image device 10 may be reduced.

Therefore, in order to indirectly cool the portion (first measuring unit) having the highest temperature in the image element 10, the amount of air blower provided in the portion having the lowest temperature (third measuring unit) is increased to increase unnecessary noise. You don't have to.

In addition, the heat absorbing member 90 connected to the heat dissipation member 70 may be positioned in a region where heat is generated by a pipe 82 filled with a working fluid therein, using one blower fan in various directions. Since three-dimensional cooling is possible, the cooling efficiency of the blower fan can be maximized.

6 is a graph showing a temperature state of an image device measured in a general heat dissipation structure, and FIG. 7 is a graph showing a temperature state of an image device measured in a heat dissipation structure to which an embodiment of the present invention is applied.

As shown in these figures, after the heat transfer member 80 is disposed in front of the image element 10, the temperature of the first measuring unit 14 is 51 ° C, 57 ° C, the second measurement The temperature of the part 16 can be confirmed that the temperature is lowered from 50 ° C to 45 ° C, the temperature of the third measuring unit 18 from 43 ° C to 40 ° C.

In addition, it can be seen that the temperature difference of the imaging device 10 (the first measuring unit to the third measuring unit) is lowered from 14 ° C to 11 ° C, so that the temperature deviation of the imaging device 10 is reduced. As described above, the temperature of the entire image element 10 is lowered by the heat transfer member 80 and the temperature variation is reduced, thereby improving durability of the image element 10.

The scope of the present invention is not limited to the embodiments described above, but is defined by the claims, and various changes and modifications can be made by those skilled in the art within the scope of the claims. It is self-evident.

1 and 2 are a perspective view and a bottom view showing the front and back configuration, respectively, of a typical image device.

3 and 4 are perspective views showing main components of the preferred embodiment of the image projection apparatus according to the present invention from different directions.

Figure 5 is a perspective view showing a state in which the case is mounted in the embodiment of the present invention.

6 is a graph showing a temperature state of an image device measured in a general heat dissipation structure.

7 is a graph showing a temperature state of an image device measured in a heat radiation structure to which an embodiment of the present invention is applied.

Explanation of symbols on the main parts of the drawings

10: image device 12: measuring unit

14: first measuring unit 16: second measuring unit

18: third measuring unit 30: light source

32: lamp assembly 40: color wheel assembly

44: light tunnel assembly 46: illumination lens

50: mirror 52: aspheric mirror

60: projection lens assembly 70: heat dissipation member

72: heat sink 74: heat sink fin

80: heat transfer member 82: pipe

84: first pipe 86: second pipe

90: heat absorbing member 92: first heat absorbing member

94: second heat absorbing member 98: case

Claims (16)

An image element generating an image using light emitted from the light source unit; A heat radiating member provided on a rear surface of the image device to radiate heat generated from the image device; At least one pipe that is heat transferably connected to the heat dissipation member; And a heat absorbing member positioned in front of the image element and configured to be capable of heat transfer to the pipe. The method of claim 1, And a working fluid for transferring heat between the heat dissipation member and the heat absorbing member is filled in the pipe. The method of claim 2, And both ends of the pipe are positioned at different heights to transfer heat through convection according to the temperature of the working fluid. The method of claim 3, wherein The heat absorbing member, A first heat absorbing member disposed closer to the light source than the image device to absorb heat generated from the front of the image device; And a second heat absorbing member provided between the first heat absorbing member and the heat radiating member to transfer heat. The method of claim 4, wherein The pipe is A first pipe connecting the heat radiating member and the second heat absorbing member; And a second pipe connecting the second heat absorbing member and the first heat absorbing member in a state separated from the first pipe. The method of claim 5, The first pipe is provided on one side of the heat dissipation member furthest from the light source and extends inclinedly to the second heat absorbing member, and the second pipe extends toward the other side of the heat dissipating member and is connected to the first heat absorbing member. Image projection apparatus characterized in that. The method of claim 6, And the first heat absorbing member and the second heat absorbing member are positioned between the image element and the projection lens assembly to which the image is projected. The method of claim 7, wherein And the first heat absorbing member, the second heat absorbing member, and the pipe are provided to surround the synthesis system for synthesizing the images by providing the image elements. The method of claim 2, The pipe is an image projection apparatus, characterized in that consisting of a vacuum sealing tube provided with a porous material on the inner surface. The method of claim 9, The pipe is An evaporation section in which the working fluid evaporates in response to the heat energy of the heat source, Insulating part which constitutes a passage of working fluid and without heat exchange with the outside, And a condensation unit configured to condense a working fluid that is steam to release thermal energy. The method of claim 1, And a case in which the image element is provided to partition a synthesis system for synthesizing the image, and the heat absorbing member is in close contact with the heat transfer unit. The method of claim 10, The heat absorbing member, A first heat absorbing member provided on a side surface of the case closest to the light source to absorb heat generated in front of the image device; And a second heat absorbing member provided between the first heat absorbing member and the heat radiating member and provided on an upper surface of the case to transfer heat. 13. The method of claim 12, And the first heat absorbing member and the second heat absorbing member, and the second heat absorbing member and the heat radiating member are connected to each other by a pipe filled with a working fluid for transferring heat therein. The method of claim 13, And one end of the pipe connected to the first heat absorbing member, the second heat absorbing member, and the heat radiating member is positioned at different heights. The method of claim 14, The first heat absorbing member and the second heat absorbing member are positioned between the image element and the projection lens assembly on which the image is projected, and the first heat absorbing member, the second heat absorbing member, and the pipe surround the synthesis system. Video projection device characterized in that. The method according to any one of claims 1 to 15, And a blower fan provided in the heat dissipation member to flow air.

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