JP2001142148A - Silencer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silencer with simple constitution for remarkably suppressing the blasting noise produced when cooling a liquid crystal panel or light source lamp unit, etc., of a projection type display device. SOLUTION: An elastic film body 102 is stuck to a peripheral wall part facing a ventilation path of an exhaust air conduit member 101 for conducting the exhaust air of an exhaust fan 7 to the outside of the device body and the rear side of this elastic film body 102 is provided with an approximately hermetic air chamber, where the elastic film body is brought into collision against the exhaust air stream to convert part of noise energy to the vibration energy and heat energy of the elastic film body 102, by which the noise energy is attenuated and thereby the blasting noise over the entire part of the decide is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention decomposes white light from a light source lamp into three color lights of red, blue and green, and makes each of these lights correspond to image information through a light valve composed of, for example, a liquid crystal panel. Efficiently cools the light source lamp unit and liquid crystal panel unit, which can be used in a projection display device, etc., which combines the modulated light of each color after modulation and enlarges and projects it on the screen via the projection lens unit. The present invention relates to a silencer that can be made and that can significantly reduce the blowing noise caused by a cooling fan.

[0002]

2. Description of the Related Art In recent years, a projection type liquid crystal display device uses a high-resolution light valve device, for example, a liquid crystal panel, to project image information more clearly. Have been. In addition, with the spread of personal computers such as notebook personal computers, electronic presentations are also frequently used, and small and lightweight projection display devices with excellent portability are strongly desired as image output devices such as notebook personal computers.

[0003] As the luminance increases, the rated input power of the light source lamp also increases, and the cooling performance of the constituent optical element parts and the like has become an important issue. High rotation and large size are progressing. As a result, wind noise and the like caused by the rotation of the cooling fan become excessive, which is a problem. Therefore, there is a strong demand for a small projection type display device that has the same cooling performance but low noise.

FIG. 5 is a plan view showing a cooling structure of a light source lamp unit of a conventional projection display device. A cooling structure of a conventional projection display device will be described with reference to the drawings.

[0005] In the conventional projection display device, reference numeral 1 denotes a light source lamp unit, and reference numeral 2 denotes color separation of white light from the light source lamp unit 1 into red, blue, and green, and collects each of the color-separated lights. It is an irradiation optical unit. Reference numeral 3 denotes a liquid crystal panel unit that modulates light condensed by the irradiation optical unit 2 in accordance with image information, and is a color combining unit that performs color synthesis of the modulated light with a light valve that includes the liquid crystal panel unit 3. 4 form image information. Further, an image is enlarged and projected on a screen by a projection optical unit 5 for enlarging and projecting the light synthesized by the color synthesizing unit 4. In addition, the power supply unit 6 includes a power supply unit 6 serving as a driving source for driving a light source lamp unit and an electric device, and a signal processing circuit (not shown).

In this type of projection display device, the self-heating of the light source lamp unit 1 having a strong light output, the temperature rise of the optical element parts such as the liquid crystal panel unit 3 into which the light emitted from the light source lamp unit 1 enters, and the power supply Generally, forced cooling is necessary for heat generation due to loss of each device of the unit 6, and a plurality of cooling fans or the like corresponding to a cooling block such as a light source lamp, a liquid crystal panel unit, or a power supply unit are used. Each cooling device is incorporated.

First, the cooling structure of the light source lamp unit 1 will be described with reference to the drawings. In FIG. 1, 7
Sucks and ventilates air in a high-temperature atmosphere around the light source lamp unit 1 so that the light source lamp unit 1
This is an exhaust fan for cooling the light source lamp, which appropriately cools the high-temperature part and controls the temperature. The light source lamp housing member 8 is arranged on the upstream side of the air flow by the light source lamp exhaust fan 7 and holds the light source lamp unit 1. The light source lamp housing member 8 has an opening for air flow, which serves as an air exhaust port, for discharging the high-temperature atmosphere air around the light source lamp unit 1 sucked from the light source lamp exhaust fan 7 to the outside of the apparatus. Are integrally formed. In addition, when the inside of the light source lamp housing member 8 becomes negative pressure by the light source lamp exhaust fan 7, air is sucked into the upstream side so that air flows along the bulb or the reflector portion of the light source lamp unit 1. The mouth is formed. The light source lamp housing member 8 has a guide portion capable of detachably holding the light source lamp unit 1 so that the light source lamp unit 1 can be exchanged and managed, and is positioned and fixed to the housing 10 or the irradiation optical unit 2 of the apparatus.

Here, the mechanism for cooling the inside of the housing and the light source lamp unit 1 will be described. When the exhaust fan 7 for cooling is driven to rotate, air flows in the direction of arrow A, and the air inside the light source lamp unit 1 and around the light source lamp housing member 8 and further inside the housing is removed from the outside of the housing. To be discharged to
With the air circulation, heat is exchanged in the heat-generating high-temperature portion, and cooling is performed. Further, the optimum cooling temperature of the light source lamp unit 1 is adjusted by the drive voltage of the exhaust fan 7 to perform cooling.

[0009]

As described above,
Conventional projection display devices use a high-resolution, high-definition light valve device to project image information more clearly, and furthermore, images on the screen can be seen clearly without darkening the viewing room. In order to make the projection screen brighter, higher brightness is being promoted. For this reason, it is common practice to achieve high brightness by applying a high-output light source lamp unit, to use a large exhaust fan to satisfy cooling performance, or to rotate the exhaust fan at high speed. And satisfied the cooling performance. However, in the above-described conventional configuration, it is referred to as the Nz sound of the exhaust fan.
There is a problem that the wind noise of the fan blades is largely radiated to the outside of the set, so that the blowing noise becomes excessive and hinders viewing.

The present invention focuses on such a problem, and can significantly improve the cooling efficiency of a heat source such as a light source lamp unit and can significantly reduce the blowing noise radiated to the outside of the apparatus. An object of the present invention is to provide a silencer.

[0011]

SUMMARY OF THE INVENTION In order to solve this problem, a first invention of the present application is a silencer in an apparatus provided with a heat source such as a light source lamp unit and an exhaust fan for exhausting the heat source. The air guide member for the exhaust air of the exhaust fan is hermetically arranged from the air outflow side of the exhaust fan to the outside of the device, and a sound wave generated by the exhaust fan is provided on a peripheral wall of the air guide member facing the ventilation path. The vibrating elastic film body is disposed at a position where it collides at least with the flow of exhaust air and does not block the air flow in the exhaust direction, and an air chamber is formed on the back side of the elastic film body. This is a silencer.

According to the first aspect of the present invention having the above features, the wind noise (Nz sound) of the blades generated from the exhaust fan for cooling the heat source such as the light source lamp unit is radiated to the outside of the apparatus. In addition, since the elastic film provided on the peripheral wall is vibrated by the sound wave and a part of the sound energy is converted into the heat energy, the noise radiated to the outside of the apparatus can be suppressed extremely low.

A second aspect of the present invention is a muffler for a device including a heat source such as a light source lamp unit and an exhaust fan for exhausting heat from the heat source. The passage is hermetically arranged from the air outflow side of the exhaust fan to the outside of the machine, and a ventilation passage having a predetermined length and a sudden increase in the sectional area of the passage in the middle of the ventilation passage from the exhaust fan to the outside of the device. And a breathable foam material is attached to the suddenly enlarged portion so that the area of the ventilation path does not change.

According to the second aspect of the present invention having the above features, the wind noise (Nz sound) of the blades generated from the exhaust fan for cooling the heat source such as the light source lamp unit is radiated to the outside of the apparatus. Before, the sound energy is lost due to the sudden increase in the cross-sectional area of the air guide path, and the sound is absorbed simultaneously by the foam material provided in the suddenly expanding part, so that the noise radiated to the outside of the device is significantly lower. Can be suppressed.

Further, a third invention of the present application is a muffler for a device including a heat source such as a light source lamp unit and a plurality of exhaust fans for waste heat of the heat source, wherein a ventilation path for the plurality of exhaust fans is provided. And a control means for maintaining the rotation phase of each exhaust fan in a predetermined relationship so as to cancel out the noise generated by the plurality of exhaust fans. It is a silencer characterized by.

According to the third aspect of the present invention, a plurality of exhaust fans having the same wind noise (Nz sound) generated from the exhaust fans for cooling a heat source such as a light source lamp unit are generated. , The compression phase of the sound is canceled, and the noise radiated to the outside of the apparatus can be significantly reduced.

According to a fourth aspect of the present invention, there is provided a light source lamp unit for emitting a white light beam, an irradiation optical unit for condensing light from the light source lamp unit, and a light condensed by the irradiation optical unit. R, G, and B liquid crystal panel units for optically generating image information, a color synthesizing unit for color synthesizing the optical information of the liquid crystal panel unit, and projection optics for enlarging and projecting the image information on a screen A unit, a cooling outside air intake formed in a device exterior case, and introducing cooling outside air into the inside of the device from the cooling outside air intake, and supplying the cooling air to the liquid crystal panel unit, the light source lamp unit and the power supply unit. And a single cooling fan that blows outside air, wherein the cooling fan has an air inlet of the cooling fan. A muffler, wherein a relationship between 却用 outside-air inlet is arranged in a position is offset.

According to the fourth aspect of the present invention having the above-described features, the intake port provided in the housing is offset from the intake port of the intake fan for cooling the liquid crystal panel and the like. In order to prevent the wind noise (Nz sound) of the fan blades from being radiated to the outside of the apparatus via the housing inlet, the noise radiated to the outside of the apparatus can be significantly reduced.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a plan view showing a muffling device in a projection type display device according to a first embodiment of the present invention. The same components as those of the conventional projection display device described in FIG. 5 will be described using the same reference numerals.
In FIG. 1, reference numeral 1 denotes a light source lamp unit, and reference numeral 2 denotes an irradiation optical unit that separates white light from the light source lamp unit 1 into red, blue, and green, and collects the separated lights. Reference numeral 3 denotes a liquid crystal panel unit that modulates light condensed by the irradiation optical unit 2 in accordance with image information, and is a color combining unit that performs color synthesis of the modulated light with a light valve that includes the liquid crystal panel unit 3. 4 form image information. Further, an image is enlarged and projected on a screen by a projection optical unit 5 for enlarging and projecting the light synthesized by the color synthesizing unit 4. In addition, the light source lamp unit 1 and a power supply unit 6 serving as a drive source for driving an electric device and a signal processing circuit (not shown) are provided.

In this type of projection type liquid crystal display device, self-heating of the light source lamp unit 1 having a strong light output, a rise in the temperature of the liquid crystal panel unit 3 and the like incident upon light from the light source lamp unit 1 and a power supply unit 6 are provided. Generally, forcible cooling is required for heat generation of the internal element parts, and each cooling device using a cooling fan or the like is incorporated.

The details of the cooling structure of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 7 denotes an exhaust fan for cooling a light source lamp that takes in and ventilates air in a high-temperature atmosphere around the light source lamp unit 1 to appropriately cool a high-temperature portion of the light source lamp unit 1 and adjust the temperature. is there. The light source lamp housing member 8 is arranged on the upstream side of the air flow by the light source lamp cooling fan 7 and holds the light source lamp unit 1. The light source lamp housing member 8 includes
In order to discharge the high-temperature atmosphere air around the light source lamp unit 1 sucked from the light source lamp cooling fan 7 to the outside of the apparatus, an opening for air flow serving as an air outlet is integrally formed. . In addition, when the inside of the light source lamp housing member 8 is made to have a negative pressure by the light source lamp cooling fan 7, air is sucked into the upstream side so that air flows along the bulb or the reflector portion of the light source lamp unit 1. The mouth is formed. The light source lamp housing member 8 has a guide portion capable of detachably holding the light source lamp unit 1 so that the light source lamp unit 1 can be exchanged and managed, and is positioned and fixed to the housing 10 or the irradiation optical unit 2 of the apparatus.

Here, the mechanism for cooling the inside of the housing and the light source lamp unit 1 will be described. When the exhaust fan 7 for cooling is driven to rotate, air flows in the direction of arrow A, and the air inside the light source lamp unit 1 and around the light source lamp housing member 8 and further inside the housing is removed from the outside of the housing. To be discharged to
With the air circulation, heat is exchanged in the heat-generating high-temperature portion, and cooling is performed. Further, the optimum cooling temperature of the light source lamp unit 1 is adjusted by the drive voltage of the exhaust fan 7 to perform cooling.

Next, the silencing structure according to the present invention will be described in detail. Reference numeral 101 denotes an exhaust air guide member that holds the exhaust fan 7 and exhausts cooling air to the outside of the housing 10. The exhaust air guide member 101 reduces the size of the exhaust passage in the direction of guiding the air to the outside of the housing 10, and the air flow for exhaust collides with the peripheral wall of the exhaust air guide member 101. However, at least the passage is secured so as not to block the exhaust passage. 102 is a state in which a sealed air layer 103 as a predetermined air chamber is secured at a place where the exhaust air guide member 101 collides with the flow of exhaust air described above, that is, the exhaust air guide member 1.
No. 01 is an elastic film adhered in a state of floating a predetermined amount from the peripheral wall. The elastic film body is a material that does not transmit a moment due to deformation, such as thin silicon rubber, and has a thickness of about 100 microns. That is, the airflow discharged to the outside of the housing 10 by the exhaust fan 7 is guided to the discharge port of the housing 10 by the exhaust air guide member 101, and collides with the elastic film body 102 in the middle thereof. become.

Here, the silencing mechanism in the present invention will be described. The elastic film body 102 receives the pressure of the air due to the collision of the airflow during the exhaust. Such an air flow includes a wind noise (Nz sound) generated when passing through the blade portion in synchronization with the rotation of the exhaust fan 7, that is, a compression wave having a density in the air. Here, due to the density of the air flow included in the air flow,
It will be vibrated by colliding with the airflow. The energy of the Nz sound depends on the elastic film 10 at the time of collision.
Due to the vibration of 2, the energy of the noise itself is attenuated by being dispersed into vibration energy, heat energy, and the like. Therefore, the noise discharged to the outside of the housing 10 through the exhaust air guide member 101 is largely suppressed by the above-described energy attenuation phenomenon, and the noise level of the device is obviously reduced. Become.

The above-described exhaust air guide member 101 may be rectangular or cylindrical, and the elastic film may be attached to the entire periphery of the peripheral wall at a portion where the elastic film collides with the exhausted air flow. The same effect can be obtained even if the adhesive is applied only to a part.

(Embodiment 2) FIG. 2 is a plan view showing a muffler in a projection type display apparatus according to a second embodiment of the present invention. Since the basic overall configuration is the same as that of the first embodiment, the same components will be described using the same reference numerals. The description of the same components will be omitted, and the silencing structure, which is a difference in the present invention, will be described in detail with reference to FIG.

Reference numeral 201 denotes an exhaust air guide member for holding the exhaust fan 7 and discharging cooling air to the outside of the housing 10. The exhaust air guide member 201 according to the present invention is characterized in that the passage cross-sectional area is sharply increased while air is exhausted to the outside of the housing 10 while being guided. The suddenly expanding portion has a certain length in the exhaust direction, and the suddenly expanding portion is provided with a foam material 202 whose surface is covered with air bubbles and is a gas permeable material. The exhaust passage shape of the exhaust air guide member 201 is configured to have a constant passage cross-sectional area. Here, the cell material 202
Is a generally called porous material, and the same effect is exhibited even if the hardness is high or the material is soft like urethane.

Here, the silencing mechanism in the present invention will be described. The air flow discharged by the exhaust fan 7 is
The air is exhausted to the outside of the housing 10 by the exhaust air guide member 201. By the way, the wind noise (Nz sound) of the blade generated by the same exhaust fan 7 becomes a compression wave of the air density and is guided to the outside of the housing 10. In the middle of the step, the portion of the passage cross-sectional area of the exhaust air guide member 201 is abruptly enlarged, and the pressure is attenuated due to the effect of the suddenly increased cross-sectional area because of the gas-permeable foam material 202. Moreover,
The pressure is further attenuated by the bubble material 202 having a bubble shape on the surface, and the pressure is discharged to the outside of the housing 10. Therefore, the noise level of the whole apparatus is largely suppressed, and the noise is obviously reduced.

(Embodiment 3) FIG. 3 is a plan view showing a muffler in a projection type display apparatus according to a third embodiment of the present invention. Since the basic overall configuration is the same as that of the first embodiment, the same components will be described using the same reference numerals. Further, the description of the same components will be omitted, and the cooling exhaust fan and the noise reduction structure which are different parts in the present invention will be described in detail with reference to FIG.

First, the cooling structure according to the present invention will be described. Reference numerals 301 and 302 denote a plurality of exhaust fans for cooling, each having the same specification. 301
And 302 by rotating the exhaust fan.
Air flows in the direction of the arrow A, and discharges air inside the light source lamp unit 1 and around the light source lamp housing member 8 and further inside the housing to the outside of the housing. Heat exchange takes place,
Cooling is performed. In addition, the optimum cooling temperature of the light source lamp unit 1 is adjusted by the driving voltage of the exhaust fans 301 and 302 to perform cooling.

Here, the details of the muffling structure of the present invention will be described with reference to the drawings. Reference numeral 303 denotes an exhaust air guide member for exhausting the exhaust air to the outside of the housing 10, and holds the plurality of exhaust fans 301 and 302 described above. Also, exhaust fans 301 and 3 of the exhaust air guiding member
The air outlets 02 have independent air paths, but between the air outlets of the housing 10,
It is put together in one air duct. Therefore, the airflow exhausted by the plurality of exhaust fans 301 and 302 is
Initially, it travels through an independent exhaust air guide path,
Before they are emitted outside, they are combined into one. Reference numeral 304 denotes a control block, which is built in, for example, a power supply unit. The control block 304 is capable of controlling the rotation phases of the plurality of exhaust fans 301 and 302 described above, and controls the plurality of exhaust fans 301 and 302.
Can be shifted by half a cycle in which the blade wind noise is generated. Therefore, the wind noise (Nz sound) generated by the plurality of exhaust fans 301 and 302 from the blades is shifted in phase by half,
The air is guided to the exhaust air guide member 303. The first path of the exhaust air guide member 303 is formed by a plurality of exhaust fans 30.
1 and 302, respectively.
Before being radiated to the outside of 0, the wind noises of the above-mentioned blades cancel each other out because the compression waves of the air density are half out of phase with each other. And as a result the housing 10
The noise radiated to the outside is greatly reduced. Therefore, the noise level of the entire device is significantly reduced.

In the above description, an axial flow fan has been described as an example. However, similar effects can be obtained by applying various types of fans, for example, a centrifugal fan or a cross flow fan.

(Embodiment 4) FIG. 4 is a plan view showing a muffling device in a projection display according to a fourth embodiment of the present invention. Note that components similar to those of the first embodiment will be described using the same reference numerals.

In FIG. 4, reference numeral 1 denotes a light source lamp unit, 2 denotes white light from the light source lamp unit 1 in red,
This is an irradiation optical unit that separates the colors into blue and green, and collects the separated lights. Reference numeral 3 denotes a liquid crystal panel unit that modulates light condensed by the irradiation optical unit 2 in accordance with image information, and is a color combining unit that performs color synthesis of the modulated light with a light valve that includes the liquid crystal panel unit 3. 4
And form image information. Further, an image is enlarged and projected on a screen by a projection optical unit 5 for enlarging and projecting the light synthesized by the color synthesizing unit 4. In addition, it is composed of a power supply circuit and a signal processing circuit (not shown).

This type of projection type liquid crystal display device has a self-heating function of the light source lamp unit 1 having a strong light output, a rise in the temperature of the liquid crystal panel unit 3 and the like incident upon the light from the light source lamp unit 1, a power supply circuit unit. Generally, forcible cooling is required for the heat generated by the cooling device, and each cooling device using a cooling fan or the like is incorporated.

The details of the cooling structure of the present invention will be described with reference to FIG. In FIG. 4, a cooling fan 12 for cooling the liquid crystal panel unit 3 is, for example, a small centrifugal fan having a large static pressure, and is arranged and fixed at a position away from the liquid crystal panel unit 3. The cooling fan 12 is provided with an air duct 11 which is located immediately below the liquid crystal panel unit 3 from the air discharge port 13 and serves as an air guide path means for guiding air to an opening (not shown) of the optical base. The configuration is such that the cooling air from the cooling fan 12 is taken in the outside direction in the direction of arrow B and guided to the liquid crystal panel unit 3. In particular, the air outlet 1 of the cooling fan 12
The air duct 11 is branched into at least two or more air passages from 3 to the three liquid crystal panel units 3 so that the cross-sectional area of the air passage 11 is substantially constant from the cooling fan 12 to the liquid crystal panel unit 3. Is formed. The end of one of the air ducts 11 branched into two or more places is independently guided by one of the R, G, and B liquid crystal panel units 3 to be guided by the liquid crystal panel unit 3.
And cooling of the polarizing film and the like.

Reference numeral 401 denotes an outside air inlet 402 of the housing 10 and a cooling fan inlet 403 of the cooling fan 12.
Between the air inlet 402 of the housing 10 and the cooling fan air inlet 4 of the cooling fan 12.
It is formed substantially hermetically over 03. Here, the outside air guide means 401 is characterized in that the intake port of the housing 10 and the cooling fan intake port 403 of the cooling fan 12 are arranged offset, and the intake port 403 of the cooling fan 12 is directly connected to the housing. The ten outside air suction ports 402, that is, the outside air inlets 402 are not disposed outside the housing.

Therefore, the wind noise (Nz sound) of the blades generated when the cooling fan 12 sucks in the outside air is blocked by the inner wall of the outside air guide means 401 before being radiated to the outside of the set. The noise generated when inhaled from outside the set is remarkably suppressed.

In the above description, the light-transmissive liquid crystal panel unit 3 is used as a light valve as a projection type display device, but it has a pixel structure and forms an optical image as an optical characteristic. If it is a light valve, it can be used for such a projection display device.

[0041]

As described above, according to the first aspect of the present invention, the air flow in the middle of exhaust collides with the elastic film provided on the peripheral wall of the exhaust air guide member, and is dispersed into vibration energy and heat energy. As a result, the energy of the noise itself is attenuated, and the noise discharged to the outside of the housing through the exhaust air guide member is greatly suppressed by the above-described energy attenuation phenomenon. The level has an excellent effect of being clearly reduced.

Further, according to the second aspect of the present invention, the wind noise (Nz sound) generated by the exhaust fan from the blades becomes a compression wave of the air density and is guided to the outside of the housing. In the middle of the exhaust air guide member, on the way with the exhaust port, a breathable foam material is arranged at the portion where the passage cross-sectional area of the exhaust air guide member suddenly expands. The pressure is attenuated, and furthermore, the pressure is further attenuated by the foamed material on the surface of the foam, and the pressure is discharged to the outside of the housing, and the noise level of the entire device is largely suppressed, An excellent effect of reducing noise is obtained.

According to the third invention of the present application, the wind noise (Nz sound) of the blades generated by the plurality of exhaust fans, respectively.
Is guided to the exhaust air guide member with the phase shifted by half,
Before being radiated to the outside of the housing, they are combined into one, so that the wind noise of the blades is such that the compression waves of the air density cancel each other out because they are half out of phase with each other. As a result, an excellent effect that noise radiated to the outside of the housing is largely suppressed can be obtained.

According to a fourth aspect of the present invention, in the outside air guide means, the intake port of the housing and the intake port of the cooling fan are offset, and the intake port of the cooling fan is directly directed to the outside air intake port of the housing. There is no arrangement. Therefore, the wind fan noise (Nz sound) generated when the cooling fan sucks in the outside air is blocked by the inner wall of the outside air guide means before being radiated to the outside of the set, and as a result, is sucked in from the outside of the set. In this case, an effect is obtained in that the noise generated at the time of the operation is remarkably suppressed.

[Brief description of the drawings]

FIG. 1 is a plan view showing a muffling device in a projection display device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a muffling device in a projection display device according to a second embodiment of the present invention.

FIG. 3 is a plan view showing a muffling device in a projection display device according to a third embodiment of the present invention.

FIG. 4 is a plan view showing a muffling device in a projection display device according to a fourth embodiment of the present invention.

FIG. 5 is a plan view showing a prior art projection display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source lamp unit 2 Irradiation optical unit 3 Liquid crystal panel unit 4 Color composition system unit 5 Projection optical unit 6 Power supply unit 7 Exhaust fan 8 Light source lamp storage member 9 Exhaust air guide member 10 Housing 11 Air duct 12 Cooling fan 13 Air discharge port 101 Exhaust air guide member 102 Elastic film body 103 Sealed air layer 201 Exhaust air guide member 202 Bubble material 301 First exhaust fan 302 Second exhaust fan 303 Exhaust air guide member 304 Control block 401 Outside air guide means 402 Outside air inlet 403 Cooling fan intake

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C058 AA06 EA02 EA26 EA51 5C060 EA01 GA01 HC01 HC09 JB06 5D061 AA04 AA26 BB37 DD06 EE01 EE12 EE24 FF02

Claims (4)

[Claims] 1. A muffler for a device including a heat source such as a light source lamp unit and an exhaust fan for exhausting heat of the heat source, wherein a wind guide member for exhaust air of the exhaust fan is provided.
An elastic film body that is hermetically disposed from the air outflow side of the exhaust fan to the outside of the device and that is capable of vibrating by sound waves generated by the exhaust fan is provided on a peripheral wall portion facing the ventilation path of the air guide member.
A muffling device, wherein the muffler is disposed at a position at least colliding with the flow of exhaust air and not blocking the flow of air in the exhaust direction, and an air chamber is formed behind the elastic film body. 2. A muffler in a device including a heat source such as a light source lamp unit and an exhaust fan for exhausting heat from the heat source, wherein a ventilation path for exhaust air of the exhaust fan is connected to an air outlet of the exhaust fan. Place hermetically from the side to the outside of the machine,
In the middle of the ventilation path from the exhaust fan to the outside of the device, a ventilation path having a predetermined length and a sudden increase in the cross-sectional area of the passage is formed. A silencer characterized by being fitted with a foam material. 3. A muffler for a device including a heat source such as a light source lamp unit and a plurality of exhaust fans for waste heat of said heat source, wherein the exhaust ports of the ventilation passages of said plurality of exhaust fans are connected to one exhaust port. And a control means for maintaining the rotation phases of the exhaust fans in a predetermined relationship so as to cancel out the noise generated by the plurality of exhaust fans. 4. A light source lamp unit for emitting a white light beam, an irradiation optical unit for condensing light from the light source lamp unit, and optically generating image information on the light condensed by the irradiation optical unit. Three liquid crystal panel units of R, G and B, a color synthesizing unit for color synthesizing optical information of the liquid crystal panel unit, a projection optical unit for enlarging and projecting image information on a screen, and formed on an outer case of the apparatus. And a single cooling unit for introducing cooling outside air into the device from the cooling outside air intake and blowing the cooling outside air to the liquid crystal panel unit, the light source lamp unit and the power supply unit. A cooling device, wherein the cooling fan is configured such that an air suction port of the cooling fan is connected to the cooling outside air intake port. Characterized in that the muffler is arranged at a position offset from the muffler.