JP2003084368A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a large heat radiation area for diverging the heat of an illumination optical system without making a projector main body larger. SOLUTION: This projector (1) has such a structure that the illumination optical system (14) including a light source (18), a color separation optical system for color-separating light from the light source, and modulation optical systems (34, 36 and 38) for respectively modulating respective light beams color- separated by the color separation optical system is housed in the housing, and it is characterized in that, by providing a tubular light tunnel which forms an optical path by connecting the light source, the color separation optical system and the modulation optical system and bringing the light tunnel into contact with the housing (2), the heat is conducted from the light tunnel to the housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector, and more particularly to a projector configured to let the heat of an illumination optical system escape to a housing of the projector.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 2000-81673 describes a liquid crystal projector. In this liquid crystal projector, the projector main body case is divided into a light source chamber including a lamp and the like and a liquid crystal panel chamber including a liquid crystal plate for modulating light from the light source by a partition plate which is partially transparent. Further, the main body case is provided with an intake port and an exhaust port, and a first cooling fan is attached adjacent to the exhaust port. A second cooling fan is attached to the partition plate inside the main body case. Second
By the action of the cooling fan, the outside air flows into the main body case from the intake port. The inflowing air cools the liquid crystal panel in the liquid crystal panel chamber, and then enters the light source chamber through the second cooling fan. The air flowing into the light source chamber cools the power source and the light source in the light source chamber, and is exhausted from the exhaust port by the first cooling fan. This efficiently cools the inside of the main body case.

On the other hand, Japanese Patent Laid-Open No. 10-239774 discloses a liquid crystal projector device. In this liquid crystal projector device, three liquid crystal panels and a dichroic prism for synthesizing light modulated by each liquid crystal panel are enclosed in a case made of metal and glass having good thermal conductivity. . The case is filled with a cooling medium, and a radiator having a radiation fin and an electronic cooling element are attached to the outside of the case. In this configuration, the heat of the liquid crystal panel is conducted to the radiator from the case having good thermal conductivity, and this heat is radiated by the electronic cooling element and the cooling air.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the liquid crystal projector described in Japanese Patent No. 673,
The optical element is cooled by sucking the air outside the main body case and directly applying the air to the optical element such as a liquid crystal panel. With this configuration, there is a problem that dust and the like that have entered the main body case along with the outside air adhere to the liquid crystal panel. A filter is provided at the intake port of the main unit case to prevent the entry of dust, but a fine filter is necessary to prevent the entry of fine dust. The problem arises that

On the other hand, in the liquid crystal projector device disclosed in Japanese Unexamined Patent Publication No. 10-239774, since the liquid crystal panel is housed in a sealed case, problems such as dust adhesion can be avoided. . However, in order to sufficiently dissipate the heat of the liquid crystal panel via the radiator, it is necessary to secure a very large heat dissipation area, and a large radiator is required. As described above, if a large radiator having a large heat dissipation area is housed in the main body, the main body becomes large. Therefore, in the liquid crystal projector of the above publication, the heat dissipation efficiency is improved by using the electronic cooling element, but the electronic cooling element causes a problem of high cost.

Therefore, it is an object of the projector of the present invention to obtain a large heat radiation area for radiating the heat of the illumination optical system without increasing the size of the main body.

[0007]

In order to achieve the above-mentioned object, the present invention provides a light source, a color separation optical system for color-separating light from the light source, and color separation by the color separation optical system. A light source, a color separation optical system, and a modulation optical system are disposed inside a projector having a structure in which a lighting optical system including the modulated optical system for respectively modulating each of It is characterized in that it has a tubular light tunnel that forms a box, and by directly contacting the light tunnel with the housing, heat is directly transferred from the light tunnel to the housing.

In this structure, the heat generated by the light source and the heat of the color separation optical system and the modulation optical system heated by the heat of the light source are conducted to the light tunnel. The heat conducted to the light tunnel is conducted to the housing that accommodates the light tunnel and is in direct contact with the light tunnel. The heat conducted to the housing is radiated from the housing to the outside air. With this configuration, heat can be dissipated from the entire large surface of the housing, so that the housing can function as a radiator having a large surface area.

Further, according to the present invention, a heat conductive material is attached between the light tunnel and the housing so as to contact them so that heat is conducted from the light tunnel to the housing via the heat conducting member. It can also be configured to. In this configuration, the heat of the light tunnel is once conducted to the heat conducting member, and the heat is conducted from the heat conducting member to the housing. According to this configuration, even when the shape of the light tunnel and the case does not match, the heat conducting member is formed in the shape of matching the light tunnel and the case, or the heat conducting member is formed in the light tunnel and the case respectively. The heat can be efficiently transferred from the light tunnel to the housing by using a material that can be deformed into a shape that conforms to the above.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a perspective view showing a housed state of a projector 1 according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a usage state of the projector 1.

A projector 1 according to an embodiment of the present invention
Is an illumination optical system (not shown) serving as a heat source, the projection lens 1
0, a first housing 2 accommodating a power source (not shown), and a second housing 4 accommodating an image processing electronic circuit (not shown) that is a signal processing unit. The second housing is rotatably connected by a hinge component 6.
This hinge component 6 allows the projector 1 to move from the storage state shown in FIG. 1 in which the front surface 2b, which is the lens mounting surface of the first housing, and the front surface 4b of the second housing face each other to the upper surface 2a of the first housing It is configured so that the upper surfaces 4a of the two housings face each other and the first housing is supported on the second housing so that it can be transformed into the use state shown in FIG. A plurality of operation switches 8 are provided on the outer side surface of the first housing. Further, the projection lens 10 and the vent hole 1 for cooling the illumination optical system and the like.
2a and 12b are provided on the front surface 2b of the first housing.

FIG. 3 is a sectional view showing the inside of the first and second casings. As shown in the figure, the first housing 2 includes an illumination optical system 14, an illumination optical system power source 16, a projection lens 10,
Have. The second housing 4 also has an electronic circuit board 56 on which an image processing circuit and the like are mounted, and a DC power supply 58 for operating the circuits of the electronic circuit board 56. The illumination optical system 14 includes a light source 18, a light pipe 20, a polarization conversion element 21, a first condenser lens 22, a second condenser lens 23, a first dichroic mirror 24, and a second dichroic mirror constituting a color separation optical system. A mirror 26,
It has mirrors 28, 30, 32, transmission type liquid crystal plates 34, 36, 38 which are modulation optical systems, and a dichroic prism 40 which is a synthetic optical system. Each of these optical elements includes the first to sixth light tunnels 42, 44, 46, 4
8, 50 and 52, respectively.

Preferably, these light tunnels are
The cross-sectional shape corresponds to the shape of the light to be emitted from the projection lens 10. That is, in the case of emitting light having a cross-sectional shape with an aspect ratio of 4: 3, it is preferable that the cross-sectional shape of the light tunnel be a substantially rectangular shape and the aspect ratio of the rectangle be 4: 3. Further, the light tunnel is preferably made of a material having high thermal conductivity, for example, a metal such as aluminum. Preferably, the inner surface of the light pipe 20 is a light reflecting surface.
Depending on the application, a rod lens may be used instead of the light pipe 20. Furthermore, depending on the application,
The first to sixth light tunnels 42, 44, 46, 48,
The inner surfaces of 50 and 52 may be light reflecting surfaces.

A light pipe 20 is arranged in the light emission direction of the light source 18, and a polarization conversion element 21 is arranged at the end of the light pipe 20 opposite to the light source 18. The first light tunnel 42 is configured to communicate with the light pipe 20, is emitted from the light source 18, and is connected to the light pipe 20.
And receives the light beam that has passed through the polarization conversion element 21. The condenser lens 2 is provided at the entrance of the first light tunnel 42.
2 is attached. The second light tunnel 44 communicates with the first light tunnel 42, and the first light tunnel 4
The first light tunnel 42 extends at a right angle from the side closer to the tip than the second condenser lens 22. The first dichroic mirror 24 is attached at a branch point between the first light tunnel 42 and the second light tunnel 42 at an angle of 45 ° with respect to the first light tunnel 42. The dichroic mirror 24 is configured to reflect red light, direct it to the second light tunnel 44, and transmit light of other colors.

The third light tunnel 46 communicates with the first light tunnel 42, is parallel to the second light tunnel 44, and is closer to the tip than the second light tunnel 44 is.
It extends at right angles to the first light tunnel 42. The second dichroic mirror 26 is attached at a branch point between the first light tunnel 42 and the third light tunnel 46 at an angle of 45 ° with respect to the first light tunnel 42. The second dichroic mirror 26 is configured to reflect green light, direct the green light to the third light tunnel 46, and transmit light of another color (blue light).

The fourth light tunnel 48 communicates with the first light tunnel 42 and extends parallel to the third light tunnel 46 from the tip of the first light tunnel 42 at a right angle to the first light tunnel 42. . Mirror 28
It is attached to the tip of the first light tunnel 42 at an angle of 45 ° with respect to the first light tunnel 42.
The mirror 28 is configured to direct incident light to the fourth light tunnel 48.

The fifth light tunnel 50 communicates with the second light tunnel 44 and extends from the tip of the second light tunnel 44 toward the tip of the third light tunnel 46 in parallel with the first light tunnel 42. The mirror 30 is attached to the tip of the second light tunnel 44 and the second light tunnel 4
It is attached at an angle of 45 ° with respect to 4, and guides the red light reflected by the dichroic mirror 24 toward the fifth light tunnel 50.

Similarly, the sixth light tunnel 52 is
Communicating with the light tunnel 48, the fourth light tunnel 48
From the tip of the first light tunnel 42 toward the tip of the third light tunnel 46. Mirror 3
2 is attached to the tip of the fourth light tunnel 48 at an angle of 45 ° with respect to the fourth light tunnel 48,
The blue light reflected by the mirror 28 is guided toward the sixth light tunnel 52.

The liquid crystal plate 34 for modulating the red light is the fifth
A liquid crystal plate 36 for modulating green light is provided at the tip of the light tunnel 50, and a liquid crystal plate 38 for modulating blue light is provided at the tip of the third light tunnel 46 and a sixth light tunnel 52.
It is attached to the tip of each. A substantially cubic dichroic prism 40 is arranged at the confluence of the third, fifth and sixth light tunnels. The dichroic prism 40 has a reflecting surface 40r which is directed in the direction of its diagonal and reflects only red light, and a reflecting surface 40 which is directed in a direction orthogonal to the reflecting surface 40r and reflects only blue light.
b and are provided. As a result, the dichroic prism 40 enters the fifth light tunnel 50 and receives the red light that is modulated by the liquid crystal plate 34, the third light tunnel 46 that receives the green light that is modulated by the liquid crystal plate 36, and the sixth light. The blue light that enters from the light tunnel 52 and is modulated by the liquid crystal plate 38 is guided to the exit surface 40a of the dichroic prism 40, respectively, and the light of each color is combined. The projection lens 10 is arranged adjacent to the exit surface 40 a of the dichroic prism 40, and the light combined by the dichroic prism 40 is projected from the projection lens 10.

FIG. 4 is an enlarged sectional view showing the attachment of the first dichroic mirror 24 to the first light tunnel 42. In this embodiment, each light pipe is provided with a groove 54 which is a component holding portion formed with a predetermined dimensional accuracy. As shown in FIG. 4, each dichroic mirror or mirror is fixed to each light pipe by being fitted into the groove 54.

FIG. 5 shows the light tunnels 46, 50 and 5 respectively.
2 is a perspective view showing how the liquid crystal plates 32, 36, 38 and the dichroic prism 40 are attached. In addition, in order to simplify the drawing, each light tunnel is illustrated in a state of being cut in the middle. As shown in FIG. 5, the holding component 6
0 receives and holds the dichroic prism 40 therein. The liquid crystal plate 38 is held by being sandwiched between the sixth light tunnel 52 and the holding component 60. Similarly, the liquid crystal plate 36 is sandwiched between the third light tunnel 46 and the holding component 60, and the liquid crystal plate 34 is sandwiched between the fifth light tunnel 50 and the holding component 60.

FIG. 6 is a perspective view showing the holding component 60. The holding component 60 has a substantially hexahedral frame structure, and has a prism receiving hole 62 for receiving the dichroic prism 40 inside and three liquid crystal plate holding recesses 64 for holding the liquid crystal plates respectively. There is. The prism receiving hole 62 is formed with a predetermined dimensional accuracy so that the dichroic prism 40 can be received and held without backlash. Liquid crystal plate holding recesses 64 are respectively formed on three of the four side surfaces of the holding component 60, and the light combined by the dichroic prism 40 is emitted from the remaining one side surface 65. Each liquid crystal plate holding recess 64 has a liquid crystal plate contact surface 66 and an outer peripheral surface 68. The liquid crystal plate received in the liquid crystal plate holding recess 64 is held in a state where the outer edge of the plate surface is in contact with the liquid crystal plate contact surface 66 and the side surface of the liquid crystal plate is in contact with the outer peripheral surface 68. The liquid crystal plate contact surface 66 is formed by the dichroic prism 40.
The liquid crystal plate is formed with a required dimensional accuracy so that the liquid crystal plate can be held in parallel with the incident surface at a predetermined distance.

The dichroic prism 40 holds the holding component 6
0, and each liquid crystal plate is pressed against the liquid crystal plate contact surface 66 in the liquid crystal holding concave portion 64 by each light tunnel, so that each liquid crystal plate is moved to the dichroic prism 40 by a predetermined distance. Positioned with precision.

FIG. 7 is a side sectional view of the first housing 2 taken along line VII-VII of FIG. As shown in FIG. 7, the light source 18 is
A lamp 70, a lamp reflector 72 that reflects the light of the lamp and directs the light to the first light tunnel, and an explosion-proof glass 7 that covers the opening of the lamp reflector 72.
4 and.

Axial fan 7 for cooling the illumination optical system
6 is provided on the back surface of the lamp reflector 72. The air introduced into the housing 2 by the axial fan 76 is
A duct 82 for directing to the light tunnel 42 is provided on the front surface side of the lamp reflector 72. Also,
The fins 84 are provided on the inner surface of the duct 82, and flow from the back surface of the lamp reflector 72 toward the front surface of the duct 82.
A portion of the air flowing into the lamp is directed toward the lamp 70. Further, a fan 78 for discharging the air sucked into the housing 2 by the axial fan 76 is provided below the dichroic prism 40.

Further, in order to dissipate heat from each light tunnel to the housing 2, a heat conducting sheet 80 having various thicknesses, which is a heat conducting member, is attached to the light tunnel. The heat conductive sheet 80 is made of a material having a high heat conductivity, and is formed so as to be in close contact with both the surface of the light tunnel and the inner surface of the first housing 2 in a wide area. Thermal conductive sheet 80
Is preferably made of, for example, silicon or a silicon-based resin. Preferably, the first housing 2 is also made of a material having a high thermal conductivity, for example, a metal. In the present embodiment, the axial fan 76 is provided on the back surface of the lamp reflector 72, but the axial fan can be provided at any position.

Next, the operation of the projector 1 according to the embodiment of the present invention will be described. When the projector 1 is used, the projector 1 is deformed from the housed state shown in FIG. 1 to the used state shown in FIG. 2 by rotating the first housing 2. In the use state, the second housing 4 functions as a leg of the projector 1. In addition, the second housing 4 also functions as a protective cover that protects the ventilation port 12 in the stored state and prevents dust and the like from entering through the ventilation port 12.

After the projector 1 is transformed into the use state, the operation switch 8 is operated to turn on the power of the projector 1. Then, the lamp 70 of the light source 18 is turned on by the operation switch 8.

The light emitted from the lamp 70 enters the light pipe 20 directly or after being reflected by the lamp reflector 72. The light that has passed through the light pipe 20 is converted into the polarization conversion element 21 and the first light tunnel 42.
Through the first condenser lens 22 mounted inside,
It is incident on the first dichroic mirror 24. The wavelength component of the red light of the light that has entered the first dichroic mirror 24 is reflected by the first dichroic mirror 24 and is directed into the second light tunnel 44. Second
The red light that has passed through the light tunnel 44 is reflected by the mirror 30 attached to the tip of the second light tunnel 44. The light reflected by the mirror 30 enters the fifth light tunnel 50 extending from the tip of the second light tunnel 44 at a right angle to the second light tunnel 44, and the liquid crystal plate 34 attached to the tip of the fifth light tunnel 50.
Incident on.

On the other hand, the wavelength components other than the red light in the light incident on the first dichroic mirror 24 are transmitted through the first dichroic mirror 24 and are incident on the second dichroic mirror 26. The wavelength component of the green light in the light incident on the second dichroic mirror 26 is reflected by the second dichroic mirror 26, is directed into the third light tunnel 46, and is attached to the tip of the third light tunnel 46. It is incident on the liquid crystal plate 36.

Of the light incident on the second dichroic mirror 26, blue light having a wavelength component other than green light passes through the second dichroic mirror 26 and enters the mirror 28. This blue light is reflected by the mirror 28 and directed into the fourth light tunnel 48,
The light passes through the second condenser lens 23 mounted in the fourth light tunnel 48. The blue light transmitted through the second condenser lens 23 is reflected by the mirror 32 attached to the tip of the fourth light tunnel 48. Mirror 32
The light reflected by the light enters the sixth light tunnel 52 extending from the tip of the fourth light tunnel 48 at a right angle to the fourth light tunnel 48, and the sixth light tunnel 52.
Enters the liquid crystal plate 38 attached to the tip of the.

The red light incident on the liquid crystal plate 34 is reflected by the liquid crystal plate 3.
It is modulated by 4 and enters the dichroic prism 40. The reflecting surface 40r provided in the dichroic prism 40 reflects red light and projects it onto the projection lens 1
Send to 0. Similarly, the green light that has entered the liquid crystal plate 36 is modulated by the liquid crystal plate 36 and enters the dichroic prism 40. The green light passes through the reflecting surfaces 40r and 40b provided in the dichroic prism 40 and enters the projection lens 10. The blue light that has entered the liquid crystal plate 38 is modulated by the liquid crystal plate 38 and enters the dichroic prism 40. The reflecting surface 40 b provided in the dichroic prism 40 reflects blue light and directs it to the projection lens 10. As a result, the lights modulated by the liquid crystal plates 34, 36 and 38 are combined by the dichroic prism 40 and the projection lens 1
It is incident on 0 and forms an image on the screen S.

Next, the cooling action on the illumination optical system will be described. The axial fan 76 sucks air from the outside of the first housing 2 through the ventilation port 12a and causes the air to flow from the rear side to the front side of the lamp reflector 72. Since the axial fan 76 is mounted directly behind the lamp reflector 72, a uniform air flow is generated around the lamp reflector 72 by the axial fan 76. The air flowing along the back surface of the lamp reflector 72 enters a duct 82 provided in front of the lamp reflector 72. A part of the air that has entered the duct 82 is deflected by the fins 84 provided in the duct 82 to form a vortex. The air flow caused by the vortex cools the peripheral portion of the lamp reflector 72.

On the other hand, a part of the air flowing around the lamp reflector 72 flows inside the first housing 2 and the liquid crystal plate 3 is discharged.
Cool 4, 36, 38. The air that has cooled the liquid crystal plate
The fan 78 provided below the dichroic prism 40 discharges the air from the first housing through the ventilation hole 12b.

The heat of each light tunnel is immediately transferred to the heat conduction sheet 80 which is directly attached to the light tunnel and is in contact with it over a wide area. Thermal conductive sheet 80
The heat transmitted to the sheet is quickly conducted to the entire sheet made of a material having a high thermal conductivity. As a result, the temperature of the entire heat conductive sheet 80 becomes uniform, that is, the temperature of the surface of the sheet that contacts the light tunnel becomes substantially equal to the temperature of the surface that contacts the first housing 2. Thermal conductive sheet 80
The heat of is quickly transmitted to the first housing 2 that is in contact with the heat conductive sheet 80 over a wide area. The heat transmitted to the first housing 2 is quickly conducted to the entire first housing 2 made of a material having high thermal conductivity, and the temperature of the entire first housing 2 becomes substantially uniform. The heat of the first housing 2 is radiated to the outside air from the entire surface of the first housing 2 having a large surface area.

According to this embodiment, since the heat conduction sheet 80 is directly attached to each light tunnel forming the illumination optical system, the heat of the illumination optical system can be quickly transferred to the heat conduction sheet 80. Further, since each light tunnel and the heat conducting sheet 80 are in contact with each other over a wide area, more heat can be transferred to the heat conducting sheet 80 per unit time. Moreover, since the heat conductive sheet 80 is made of a thin material having a high heat conductivity, the heat received from the light tunnel can be quickly transferred to the contact surface with the first housing 2. Further, the heat conductive sheet 80 and the first housing 2
Are in contact with each other over a wide area, so that more heat can be transferred to the first housing 2 per unit time. Moreover, since the first housing 2 is made of a material having a high thermal conductivity, the heat transferred from the heat conductive sheet 80 can be quickly transferred to the first housing 2.
It is conducted to the entire housing 2. As a result, the entire first housing 2 having a large surface area can be effectively used for heat dissipation. Thus, the heat of the illumination optical system can be efficiently dissipated to the outside air.

Although the preferred embodiments of the present invention have been described above, various modifications may be made to the disclosed embodiments within the scope of the technical matters described in the claims without departing from the scope or spirit of the present invention. Can be changed. In particular, although the transmissive liquid crystal projector has been described in the embodiments of the present invention, the present invention may be applied to other projectors such as a DMD (Digital Micro-mirror Devic).
e) Projector, DLP (Digital Light Processin)
g) Projector, LCOS (Liquid Crystal on Silic)
on) It can be applied to a projector or the like. Also,
The present invention can also be configured such that the heat conduction member is not attached between the illumination optical system and the housing, and the illumination optical system and the housing are in direct contact and in close contact with each other. Further, the heat conduction member does not necessarily need to be attached to the entire light tunnel, and the heat conduction member is attached to a portion other than the light tunnel to be cooled,
It can also be configured to dissipate heat to the housing. Further, the heat conducting member does not have to be a flat plate shape, and can have any shape that matches the shape of the light tunnel or the case.

[0038]

According to the present invention, a large heat radiation area for radiating the heat of the illumination optical system can be obtained without increasing the size of the main body.

[Brief description of drawings]

FIG. 1 is a perspective view of a projector according to an exemplary embodiment of the present invention in a stored state.

FIG. 2 is a perspective view of a projector according to an embodiment of the present invention in use.

FIG. 3 is a top sectional view of a projector according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing how a dichroic mirror is attached to a light tunnel.

FIG. 5 is a cut perspective view showing a mounting state of each liquid crystal plate to a dichroic prism.

FIG. 6 is a perspective view of a holding component for holding each liquid crystal plate.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 3 showing the structures of the light source and the duct.

[Explanation of symbols]

1 projector 2 First case 4 second housing 6 Hinge parts 8 operation switch 10 Projection lens 12 vents 14 Illumination optical system 16 Illumination optical system power supply 18 light source 20 light pipes 21 Polarization conversion element 22 First Condenser Lens 23 Second condenser lens 24 First Dichroic Mirror 26 Second Dichroic Mirror 28 mirror 30 mirror 32 mirror 34 LCD plate 36 LCD plate 38 LCD plate 40 dichroic prism 42 First Light Tunnel 44 Second Light Tunnel 46 Third Light Tunnel 48 Fourth Light Tunnel 50th Light Tunnel 52 6th Light Tunnel 54 groove 56 electronic circuit board 58 DC power supply 60 holding parts 62 Prism receiving hole 64 LCD plate holding recess 66 Liquid crystal plate contact surface 68 outer peripheral surface 70 lamp 72 lamp reflector 74 Explosion-proof glass 76 axial fan 78 fans 80 Thermal conductive sheet 82 duct 84 fins

Claims (2)

[Claims] 1. A light source, a color-separation optical system for color-separating light from the light source, and a modulation optical system for modulating each light beam color-separated by the color-separation optical system. In a projector having a structure including an illumination optical system in a housing, the light source, the color separation optical system, and the modulation optical system are disposed inside, and a tubular light tunnel that forms an optical path is provided. A projector which directly conducts heat from the light tunnel to the housing by directly contacting the housing with the housing. 2. A heat conductive material is mounted between and in contact with the light tunnel and the housing,
The projector according to claim 1, wherein heat is conducted from the light tunnel to the housing via the heat conducting member.