JP2000171920A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which efficiently suppresses the temperature elevation of a light source without allowing the infiltration of dust and dirt into the light source device and is excellent in silence. SOLUTION: The outside of a casing 1 provided with a light source section 3 for generating light when emitting light so as to enclose the light source section 3 in a hermetically sealing state is provided with such an air circulation pipeline 2 which circulates the air in the casing 1. The air circulation pipeline 2 is internally provided with a Sirocco fan for circulating the air in the air circulation pipeline 2 and the casing 1. The heated air in the casing 1 is cooled when passing an exhaust duct 9 and a heat exchanger 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device used for scanning a photographic film or printing a photosensitive material such as photographic printing paper.

[0002]

2. Description of the Related Art Conventionally, a halogen lamp has been widely used as a light source for scanning a photographic film or printing a photosensitive material such as photographic printing paper. Halogen lamps generate a large amount of heat when emitting light, so that various parts in the light source housing that accommodates the halogen lamp are heated. Therefore, a structure for cooling the inside of the light source housing is required in order to keep the temperature rise of various components in the light source housing within the allowable temperature.

FIG. 7 is a schematic diagram showing a schematic configuration of a conventional light source device for photographic printing. A halogen lamp 31 and a reflector 32 are arranged inside a light source housing 33. A heat sink 34 for absorbing and dissipating heat is provided in the lamp sealing portion of the halogen lamp 31.

A part of the light emitted from the halogen lamp 31 is reflected by the reflector 32, passes through the dust-proof glass 35, and enters a negative mask (not shown).

[0005] An exhaust port 36 is provided on one side surface of the light source housing 33, and a cooling fan 37 is provided in the exhaust port 36. An air inlet 38 is provided on the other side surface of the light source housing 33, and an air filter 39 is provided in the air inlet 38. When the cooling fan 37 rotates in such a direction as to suck the air in the light source housing 33, the outside air flows into the light source housing 33 from the air inlet 38 through the air filter 39. Then, the inflowing outside air is exhausted from the exhaust port 36 after cooling components such as the heat sink 34 and the reflector 32 provided in the halogen lamp 31.

As described above, in the conventional light source device for photographic printing, cooling is performed by introducing outside air into the light source housing 33 in order to suppress the temperature rise of various components in the light source housing 33.

[0007]

However, when cooling is performed by introducing outside air into the light source housing 33 as in the above-described configuration, dust and dirt are entrained in the light source housing 33. . This allows
A problem arises in that dirt adheres to the optical components in the light source housing 33, which causes a reduction in performance and deterioration of each component. In order to prevent such a problem, maintenance such as periodically cleaning the inside of the light source housing 33 has been required.

Further, since the cooling fan 37 is disposed so as to be exposed to the outside of the light source housing 33, the noise is relatively large. The air sucked by the cooling fan 37 is air that has passed through a fine air filter 39, and has a considerably large flow path resistance. Therefore, it is necessary to relatively increase the output of the cooling fan 37, and this has caused a problem that the noise is further increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light source device which efficiently suppresses a rise in temperature of the light source and prevents noise from entering the light source device and which is excellent in quietness.

[0010]

According to a first aspect of the present invention, there is provided a light source device provided with a light source unit that generates heat when emitting light and a light source unit that surrounds the light source unit in a sealed state. A housing, an air circulation line arranged outside of the housing, and a line connected to the housing so as to circulate the air in the housing, and circulating air in the air circulation line and in the housing. To this end, the air circulation device is provided with a blower provided in the air circulation line and a heat exchange device for performing heat exchange between the inside and the outside of the air circulation line.

According to the above configuration, the air in the housing whose temperature has been increased by the heat generated from the light source unit is circulated in the air circulation pipe by the blowing means, and is cooled by the heat exchange means in the air circulation pipe. Therefore, there is no possibility that outside air enters the inside of the housing. Therefore, since dust and dust do not enter the housing, it is possible to solve the problem that various optical components in the housing are contaminated and cause deterioration in performance or deterioration of components.
At the same time, it is not necessary to perform maintenance such as periodically cleaning the inside of the housing.

Further, since the air blowing means for circulating the air in the casing and in the air circulation line is provided in the air circulation line, the noise can be made relatively small.

According to a second aspect of the present invention, in the light source device according to the first aspect, the air circulation pipe includes an exhaust duct for exhausting air from the housing, an intake duct for sending air into the housing, A heat exchanger is provided between the exhaust duct and the intake duct as the heat exchange means.

According to the above configuration, the air in the casing passes through the exhaust duct, is cooled in the heat exchanger, and then returns to the casing again through the intake duct. The configuration is such that there is less resistance to the channel. Therefore, the output of the blower can be relatively reduced, and the noise can be further reduced.

According to a third aspect of the invention, in the configuration of the second aspect, the exhaust duct is formed of a bellows-shaped metal pipe having a plurality of fins formed on an outer surface.

According to the above configuration, since the exhaust duct is configured to facilitate heat exchange between the inside and the outside of the pipe, the circulating air can be cooled also in this exhaust duct. it can. Therefore, since the heat exchange capacity required in the heat exchanger can be reduced, the cost can be reduced by, for example, simplifying the configuration of the heat exchanger. Further, since it becomes possible to reduce the flow path resistance in the heat exchanger, it is possible to reduce the output of the blowing means and reduce the noise.

According to a fourth aspect of the present invention, in the light source device according to the second aspect, the heat exchanger includes a heat exchanger cooling fan.

According to the above configuration, since the heat exchanger is cooled by the heat exchanger cooling fan, the heat exchange in the heat exchanger can be performed more efficiently.

According to a fifth aspect of the present invention, in the configuration of the second aspect, the heat exchanger includes a heat pipe in which a refrigerant is sealed in a hollow pipe made of metal. .

According to the above configuration, since the heat pipe has a very high heat exchange capacity, the heat exchange capacity of the heat exchanger can be extremely increased.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the light source device according to the present embodiment includes a housing 1 as a lamp box and an air circulation pipe 2.

In the housing 1, a light source unit 3, first and second
Are provided with the fly-eye lenses 4A and 4B and the condenser lens 5. The first and second fly-eye lenses 4A and 4B and the condenser lens 5
And a negative film (not shown) conveyed to a predetermined position outside the light source device, and are provided in this order along the light emitting direction of the light source unit 3 on the optical axis.

Although not shown in FIG. 1, between the second fly-eye lens 4B and the condenser lens 5, the optical axis of the light transmitted through the second fly-eye lens 4B is There is provided a cold mirror that reflects light in the direction in which is disposed. That is, FIG.
In the above, light emitted downward from the light source unit 3 passes through the first and second fly-eye lenses 4A and 4B, and is reflected by a cold mirror, whereby the optical axis direction is bent by 90 °. Then, the light reflected by the cold mirror travels in the direction facing the paper surface, passes through the condenser lens 5, and reaches the negative film.

The light source device according to the present embodiment is used as a light source device for irradiating a negative film with light and detecting an original image recorded on the negative film by a CCD (Charge Coupled Device), or as a photosensitive material. Is used as a light source device for printing on photographic paper. However, the present invention is not limited to such a light source device, and can be applied to any device that emits light from a light source.

The light source section 3 includes a halogen lamp 6, a heat sink 7, and a reflector 8.

As the halogen lamp 6, it is preferable to use a halogen lamp having a single filament serving as a light emitting portion, the longitudinal direction of which is parallel to the light emitting direction. This is because the halogen lamp 6 having such a configuration emits light closest to an ideal point light source when viewed from the direction of the negative film, and minimizes uneven light amount on the negative film. Because you can. However, the present invention is not limited to the halogen lamp 6 having such a configuration. For example, the halogen lamp 6 includes one filament serving as a light emitting unit, and the longitudinal direction thereof is perpendicular to the light emitting direction. It is possible to use one in which two filaments are provided and the longitudinal direction of each filament is parallel to the light emission direction.

The heat sink 7 supplies power to the halogen lamp 6 and functions both as a socket for fixing the halogen lamp 6 at a predetermined position and as a heat sink for absorbing and releasing heat generated in the halogen lamp 6. have.

The reflector 8 reflects the light emitted from the halogen lamp 6 and forwardly reflects the light (the first fly-eye lens 4A).
Direction), and is provided in a concave shape around the halogen lamp 6 so that the light can be collected. The curvature of the reflecting surface of the reflector 8 is designed so that the reflected light is applied to almost the entire area of a first fly-eye lens 4A described later.

The reflector 8 is made of a metal material such as aluminum, and has a plurality of fins for heat radiation on the outer surface opposite to the light reflecting surface. Therefore, the reflector 8 has an excellent function of absorbing and emitting the heat generated by the halogen lamp 6.

The material forming the reflector 8 is not limited to the above-mentioned one. For example, a structure may be used in which a dichroic mirror having a function of reflecting visible light is formed on a reflecting surface of a glass member. It is also possible to use However, when the reflector 8 made of a glass material is compared with the reflector 8 made of a metal material as in the present embodiment, the reflector 8 made of a metal material has more stable reflection characteristics. And it is inexpensive and has a long life.

Since the reflector 8 and the heat sink 7 are directly fixed by screws or sandwiched by spring steel, the relationship between the light emitting position of the filament in the halogen lamp 6 and the curvature of the concave surface of the reflector 8 is determined. It can be set with high accuracy. Also, at the time of assembling or replacing, it is possible to easily determine a delicate arrangement relationship between the halogen lamp 6 and the reflector 8. Further, since the heat absorbed in the heat sink 7 can easily move to the reflector 8 having a high heat radiation effect, the heat generated in the halogen lamp 6 can be more efficiently cooled.

It is also possible to adopt a structure in which a heat ray absorbing film having a function of absorbing infrared rays is deposited on the reflecting surface of the reflector 8, and in this case, the infrared component of the light reflected by the reflector 8 is reduced. be able to.

First and second fly-eye lenses 4A and 4A
B has a structure in which a transparent substrate and a large number of microlenses are integrally formed, and does not contain a milky white pigment or the like, and is colorless and transparent. The microlenses are all formed in the same shape, and are two-dimensionally and regularly arranged on the surface of the transparent substrate in consideration of the focal point of each microlens. At this time, each micro lens in the first fly-eye lens 4A is arranged so as to guide the incident light into the area of the second fly-eye lens 4B, and each micro lens in the second fly-eye lens 4B controls the incident light. It is arranged so as to guide into the area of the condenser lens 5.

The light incident on the first and second fly-eye lenses 4A and 4B having such a configuration is refracted and diffused on the surface having the uneven shape. It can be said that light incident on 4A and 4B is split by a large number of microlenses. Therefore, the first and second fly-eye lenses 4
A.4B has a function equivalent to a surface light source by the action of the microlens. Since the first and second fly-eye lenses 4A and 4B are both composed of a transparent transparent substrate and a micro lens, the transmittance is 9%.
0% or more is realized, and the degree of dimming of light emitted from the light source is suppressed to a low level. As described above, the first and second fly-eye lenses 4A and 4B can uniformly diffuse the incident light and minimize the decrease in the amount of light.

The first fly-eye lens 4A having the above structure is disposed on the light emitting side of the light source unit 3, and the second fly-eye lens 4B is provided between the first fly-eye lens 4A and the cold mirror. It is located between them. Thus, the two first and second fly-eye lenses 4A
By arranging the 4B continuously in the optical axis direction, it is possible to reliably remove unevenness in the light amount of the light emitted from the halogen lamp 6.

The first and second fly-eye lenses 4
It is also possible to adopt a configuration in which a heat ray reflective coating is deposited on the surface of A.4B. In such a configuration, the arrival of heat rays to the negative film is further suppressed, and the temperature rise on the negative surface is further reduced. Can be suppressed.

The cold mirror transmits infrared light while reflecting only visible light in the direction of the negative film. In the present embodiment, a cold mirror that reflects only visible light having a wavelength of 400 to 780 nm is used. Such a cold mirror has a higher efficiency of removing infrared rays than a heat ray reflection filter having a function of reflecting heat rays and transmitting visible rays. Thus, the light emitted from the halogen lamp 6 is
Since the light of the infrared component is removed by the cold mirror, the temperature rise of the negative film can be sufficiently suppressed.

The condenser lens 5 has a function of condensing incident light in order to efficiently irradiate the light from the light source unit 3 to the image area on the negative film. In addition,
The condenser lens 5 is not limited to a configuration including one lens, and may have a configuration in which a plurality of lenses are combined.

It is also possible to configure the condenser lens 5 as a lens unit that can be attached to and detached from the housing 1, and to replace this lens unit according to the size of the negative film. However, when the lens unit is configured to be replaceable as described above, there is a possibility that dust or the like may enter the housing 1 at the time of attachment and detachment,
It is conceivable that a gap may be formed in a connection portion between the housing 1 and the lens unit. Therefore, if importance is attached to preventing dust from entering the inside of the housing 1, a fixed lens unit is preferable.

Next, the air circulation line 2 will be described.
The air circulation line 2 includes an exhaust duct (heat exchange means) 9, an intake duct 10, a heat exchanger (heat exchange means) 11, a heat exchanger cooling fan 12, and a sirocco fan (blower means) 1.
3 is provided.

The exhaust duct 9 is a tubular member, and one opening is fixed while being inserted into the housing 1, and the other opening is connected to the heat exchanger 11. This exhaust duct 9 is called a fin tube.
The plurality of fins are formed of a bellows-shaped metal pipe formed on the outer surface, and have a shape that facilitates heat exchange between the inside and the outside of the exhaust duct 9. That is, the heat of the high-temperature air flowing into the exhaust duct 9 from inside the housing 1 is
The air is discharged to the outside air by the exhaust duct 9 and the heat exchanger 11.

As described above, since the exhaust duct 9 is configured to facilitate heat exchange between the inside and the outside of the pipe, the circulating air can be cooled also in the exhaust duct 9. . Therefore, the heat exchange capacity required in the heat exchanger 11 can be reduced,
For example, the cost can be reduced by simplifying the configuration of the heat exchanger 11. Further, since the flow resistance in the heat exchanger 11 can be reduced, the output of the sirocco fan 13 can be reduced and the noise can be reduced.

When it is not convenient for the exhaust duct 9 to emit heat, for example, when the exhaust duct 9 passes near a wiring board or when there is a possibility that the exhaust duct 9 may be touched by a human, a heat insulating material is provided around the exhaust duct 9. It is also possible to adopt a configuration in which it is covered with the like. In this case, the heat of the high-temperature air flowing into the exhaust duct 9 from inside the housing 1 is released to the outside air only by the heat exchanger 11.

The intake duct 10 is also a tubular member,
One opening is connected to the housing 1, and the other opening is connected to the heat exchanger 11. Since the heat of the air passing through the air circulation pipe 2 is mostly released by the exhaust duct 9 and the heat exchanger 11,
At 0, there is almost no need to consider thermal conductivity, and any tubular member may be used.

A sirocco fan 13 is provided inside a pipe connecting the heat exchanger 11 and the intake duct 10.
As the sirocco fan 13 rotates, the air inside the air circulation line 2 and inside the housing 1 is circulated. That is, the air inside the housing 1 warmed by the heat generated when the halogen lamp 6 in the light source unit 3 emits light is sucked into the opening of the exhaust duct 9 inserted and arranged inside the housing 1, It is cooled by the heat exchanger 11 and returns to the inside of the housing 1 through the intake duct 10.

As described above, since the air inside the casing 1 is merely circulating through the inside of the intake circulation pipe 2, the outside air does not flow into the casing 1 at all. ing. Therefore, since dust and dust do not enter the inside of the housing 1, the problem that dirt adheres to the optical components in the housing 1, which causes a reduction in performance, a deterioration of each component, and the like is solved. Further, it is not necessary to periodically perform maintenance such as cleaning the inside of the housing 1.

Since the sirocco fan 13 is disposed inside the pipe connecting the heat exchanger 11 and the intake duct 10 as described above, the noise caused by the rotation of the sirocco fan 13 is relatively small. Becomes

Next, the heat exchanger 11 will be described in more detail. 2 to 4 show specific examples of the configuration of the heat exchanger 11. FIG.

The heat exchanger 11 shown in FIG. 2 has a structure in which a plurality of thin pipes 11A are provided. The air flowing from the exhaust duct 9 passes through the inside of the plurality of thin pipes 11A and flows out to the intake duct 10.
At this time, the heat of the air flowing from the exhaust duct 9 is released to the outside when passing through the plurality of thin pipes 11A. For the plurality of thin pipes 11A ...
It is also possible to adopt a configuration in which the cooling efficiency is increased by applying wind from the outside by the heat exchanger cooling fan 12.
However, since the heat exchanger 11 as shown in FIG. 2 has a shape capable of sufficiently cooling the air in the tube without cooling by the heat exchanger cooling fan 12, the halogen lamp 6 Is set in accordance with the heat generation amount of the heat exchanger.

The heat exchanger 11 as shown in FIG. 3 has a configuration in which one pipe is spirally arranged, and cooling is performed by passing air through a heat exchanger cooling fan 12 in the axial direction of the spiral. It has become.

The heat exchanger 11 as shown in FIG. 4 has a shape in which one pipe is bent twice. A plurality of radiating plates 11B are provided, and each radiating plate 1B is provided.
1B are penetrated by three points between the exhaust duct 9 and the first bending point, between the first bending point and the second bending point, and between the second bending point and the intake duct 10. It is the configuration that was done. That is, the heat of the air passing through the pipes of the heat exchanger 11 is released to the outside through the heat radiating plates 11B.

FIGS. 5A and 5B show a schematic configuration of the heat exchanger 11 having a further different configuration. FIG.
FIG. 5A is a perspective view showing the heat exchanger 11 and its surroundings, and FIG. 5B is a perspective view showing the internal configuration of the heat exchanger 11 shown by a broken line in FIG. It is.

As shown in FIG. 5B, the heat exchanger 11
Have a configuration in which a plurality of heat radiating plates 11C having excellent thermal conductivity are arranged side by side with a gap therebetween.
.. Are divided into an upper region 11D and a lower region 11E.
A partition 11F is provided at a boundary between D and the lower region 11E. That is, the upper region 11D and the lower region 11E
, Air is not mixed.

The lower region 11E is connected to the exhaust duct 9 and the intake duct 10, and the air flowing from the exhaust duct 9 is supplied to the lower region 11E of the heat exchanger 11.
And flows out to the intake duct 10. On the other hand, a heat exchanger cooling fan 12 is provided outside the upper region 11D of the heat exchanger 11, and is configured to directly contact the outside air.

In such a configuration, the heat of the air flowing from the exhaust duct 9 is transmitted to the heat radiating plates 11C in the lower region 11E, and the heat radiating plates 11C in the upper region 11D are transmitted by the heat radiating plates 11C.
Also move. Then, in the upper region 11D, the heat radiating plates 11C are cooled by an external wind from the heat exchanger cooling fan 12. That is, the air moving from the exhaust duct 9 to the intake duct 10 through the lower region 11E is cooled by heat conduction in the heat radiating plates 11C without contacting outside air.

FIG. 6 shows an example of the internal configuration of the heat exchanger 11 shown by the broken line in FIG. 5A, which is different from the configuration shown in FIG. 5B. This configuration includes a plurality of heat pipes 11G and a plurality of radiating fins 11H in place of the radiating plates 11C. Each heat pipe 11G is arranged so as to penetrate the partition 11F so that its upper part is arranged in the upper area 11D and its lower part is arranged in the lower area 11E. A plurality of radiating fins 1 are provided in contact with the outer walls of these heat pipes 11G.
1H... Are provided.

The heat pipe 11G has a structure in which water (refrigerant) is sealed in a tube made of copper. In the lower part of the heat pipe 11G, the water heated by the heat of the air flowing into the lower region 11E from the exhaust duct 9 evaporates and rises to the upper part of the heat pipe 11G. The steam rising to the upper part of the heat pipe 11G is supplied to the heat exchanger cooling fan 1 in the upper region 11D.
It is cooled and condensed by the external wind from 2. Then, the water that has been condensed into water drops again falls to the lower portion of the heat pipe 11G due to gravity. By repeating the above-described circulation, the heat pipe 11G emits the heat of the air flowing into the lower region 11E from the exhaust duct 9 to the outside. The heat conductivity of the heat pipe 11G having the above-described configuration is, for example, about 1000 times that of silver as a single substance, and is extremely excellent in heat exchange performance.

As described above, the heat pipe 11G is configured to perform heat exchange by changing the phase of water, and utilizes the fact that cooled and liquefied water falls to the lower part of the heat pipe 11G by gravity. Therefore, normally, the heat pipe 11G is provided so as to absorb heat at the lower part and emit heat at the upper part. However, if the inner wall of the pipe of the heat pipe 11G is provided with, for example, a cotton or gauze-like fibrous material, the cooled and liquefied water can move in the pipe by capillary action. It is also possible to adopt a configuration in which the heat pipes 11G are arranged horizontally.

The heat pipe 1 according to the present embodiment
1G has a configuration in which water is sealed in a tube made of copper as described above, but is not limited to this. For example, as the material of the tube, a material having good thermal conductivity such as aluminum can be used. In addition, as the refrigerant, alcohol, chlorofluorocarbon, water mixed with impurities, or the like can be used according to the temperature on the high temperature side and the temperature on the low temperature side in the heat pipe 11G.

As described above, the heat exchanger 11 having the configuration as shown in FIG. 6 has extremely excellent heat exchange performance, but on the other hand, the cost of parts is slightly higher.

As described above, in the light source device according to the present embodiment, the air in the housing 1 whose temperature has been raised by the heat generated from the light source unit 3 is circulated in the air circulation line 2 by the sirocco fan 13, It is configured to be cooled by the exhaust duct 9 and the heat exchanger 11 in the air circulation line 2. Thereby, the outside air does not enter the housing 1 at all, so that dust and dust do not enter the housing 1. Therefore, it is possible to solve the problem that dirt adheres to various optical components in the housing 1 to cause performance degradation and component deterioration, and it is necessary to perform maintenance such as periodically cleaning the inside of the housing 1. Can be eliminated.

Further, according to the above-described structure, there are relatively few passages of the circulated air which have resistance to the passage. Therefore, the output of the sirocco fan 13 can be relatively reduced, and the noise can be further reduced.

[0064]

As described above, the light source device according to the first aspect of the present invention includes a light source unit that generates heat when emitting light, a housing provided to surround the light source unit in a sealed state,
An air circulation line that is disposed outside the housing and that is connected to the housing so as to circulate air in the housing;
A heat exchange unit that exchanges heat between an inside and an outside of the air circulation line so as to circulate air in the air circulation line and the inside of the housing; Means.

As a result, there is no possibility that external air enters the housing, and dust and dust do not enter the housing. Therefore, there is an effect that it is possible to solve a problem that dirt adheres to various optical components in the housing, which causes deterioration of performance, deterioration of components, and the like. At the same time, there is an effect that it is not necessary to perform maintenance such as periodically cleaning the inside of the housing.

Further, since the air blowing means for circulating the air in the housing and the air circulation pipe is provided in the air circulation pipe, there is an effect that the noise can be relatively reduced. .

According to a second aspect of the present invention, in the light source device, the air circulation conduit includes an exhaust duct for exhausting air from the housing, an intake duct for sending air into the housing, the exhaust duct and the intake duct. And a heat exchanger serving as the heat exchange means disposed between the duct and the duct.

Thus, in addition to the effect of the first aspect, the air flow path has a relatively small flow resistance, so that the output of the blowing means can be made relatively small. In addition to this, there is an effect that the noise can be further reduced.

A light source device according to a third aspect of the present invention is configured such that the exhaust duct is formed of a bellows-shaped metal pipe having a plurality of fins formed on an outer surface.

Thus, in addition to the effect of the second aspect, the circulating air can be cooled also in the exhaust duct. Therefore, since the heat exchange capacity required in the heat exchanger can be reduced, it is possible to reduce the cost by simplifying the configuration of the heat exchanger, for example. Also, since it becomes possible to lower the flow path resistance in the heat exchanger,
This has the effect of lowering the output of the blowing means and reducing the noise.

A light source device according to a fourth aspect of the present invention is configured such that the heat exchanger includes a heat exchanger cooling fan.

Thus, in addition to the effect of the configuration of claim 2, there is an effect that the heat exchange in the heat exchanger can be performed more efficiently.

A light source device according to a fifth aspect of the invention is configured such that the heat exchanger includes a heat pipe in which a refrigerant is sealed in a hollow pipe made of metal.

Accordingly, in addition to the effect of the configuration of claim 2, there is an effect that the heat exchange capacity of the heat exchanger can be extremely increased.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a schematic configuration of a light source device according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a configuration example of a heat exchanger included in the light source device.

FIG. 3 is a perspective view showing another configuration example of the heat exchanger provided in the light source device.

FIG. 4 is a perspective view showing still another configuration example of the heat exchanger provided in the light source device.

FIGS. 5A and 5B are perspective views showing still another configuration example of the heat exchanger provided in the light source device, wherein FIG. 5A shows the appearance and FIG. 5B shows the internal configuration.

FIG. 6 is a plan view showing another example of the internal configuration of the heat exchanger shown in FIG.

FIG. 7 is a schematic diagram showing a schematic configuration of a conventional light source device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Air circulation line 3 Light source part 4A * 4B 1st and 2nd fly-eye lens 5 Condenser lens 6 Halogen lamp 7 Heat sink 8 Reflector 9 Exhaust duct 10 Intake duct 11 Heat exchanger 12 Heat exchanger cooling fan 13 Sirocco fan (blowing means)

Claims (5)

[Claims] 1. A light source unit that generates heat when emitting light, a housing provided to surround the light source unit in a sealed state, and a housing disposed outside the housing and circulating air in the housing. An air circulating pipe comprising a pipe connected to the air circulating pipe; air blowing means provided in the air circulating pipe so as to circulate air in the air circulating pipe and the casing; A light exchanging means for exchanging heat between the inside and the outside of the light source device. 2. The air circulation line, wherein an exhaust duct from which air is exhausted from the housing, an intake duct for sending air into the housing, and an exhaust duct disposed between the exhaust duct and the intake duct. The light source device according to claim 1, further comprising a heat exchanger as the heat exchange means. 3. The light source device according to claim 2, wherein said exhaust duct comprises a bellows-shaped metal pipe having a plurality of fins formed on an outer surface thereof. 4. The light source device according to claim 2, wherein said heat exchanger includes a heat exchanger cooling fan. 5. The light source device according to claim 2, wherein the heat exchanger includes a heat pipe in which a refrigerant is sealed in a hollow pipe made of metal.