JP2006162840A - Light source unit having exhaust structure and projector using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit having an exhaust structure capable of preventing light leakage of a light source and efficiently exhausting exhaust air with a simple configuration.
A light source unit 100 includes a light source 110 including a lamp 112, exhaust fans 122 and 124 that are disposed on a first side of the light source 110 and exhaust exhaust air that has cooled the light source, and intake air of the exhaust fan. A first air guide body 140 disposed on the side of the exhaust fan and a second air guide body 150 disposed on the exhaust side of the exhaust fan. The first air guide 140 includes a first louver 146 aligned at a first angle (eg, 135 degrees with the optical axis I), and the second air guide 150 has a second angle (with the optical axis I). 45 degrees), and the second louvers 154 are included.
[Selection] Figure 2

Description

  The present invention relates to a projector, and more particularly to a technique for preventing leakage of light from a light source.

  A projector that displays a color image using liquid crystal or DMD (Digital Micro-mirror Device) as a spatial modulation element has been put into practical use. In a projector, a high-output light source is used to obtain a brighter image or an image with good contrast. Since a high output light source generates a large amount of heat, the light source is operated while forcibly cooling the light source by a cooling fan. Moreover, since the exhaust air which cooled the light source also becomes high temperature, it is necessary to discharge this outside. In general, exhaust air is exhausted from an opening in the front of the projector where the operator is not located.

  Patent Document 1 relates to a liquid crystal projector, and discloses a technique in which an exhaust fan is inclined with respect to an optical axis of a projection lens, and exhaust air is exhausted in a direction away from a projection area. As a result, fluctuations in the projected image due to the exhaust air are prevented, and the cooling efficiency is improved.

  The projector of Patent Document 2 includes an exhaust fan that exhausts hot air through an exhaust port, a movable louver that opens and closes the exhaust port, a temperature sensor that detects the temperature in the projector, and an obstacle in the exhaust direction of the exhaust port. An obstacle sensor for detecting the presence or absence is provided, and the exhaust fan and the movable louver are controlled based on the detection information of the temperature sensor and the detection information of the obstacle sensor. Thereby, even if there is an obstacle or the like in the vicinity of the exhaust port, a sufficient heat radiation effect can be obtained, and entry of foreign matter from the exhaust port into the apparatus is prevented.

  The projector disclosed in Patent Document 3 is detected with a slit-shaped exhaust port, a slit-shaped exhaust port cover disposed opposite to the exhaust port, and an exhaust port cover driving unit that moves the exhaust port cover in the left-right direction. A cooling control structure is provided that includes exhaust port cover position adjusting means for adjusting the drive of the exhaust port cover drive unit based on the temperature. As a result, while ensuring cooling efficiency, quietness is improved without dust entering when not in use.

  By the way, when a slit or opening for air supply / exhaust is formed in the projector, the light from the internal lamp may leak to the outside. Such light leakage is both annoying and uncomfortable for the user. For this reason, it is necessary to prevent the light from the lamp from leaking to the outside.

  As shown in FIG. 7, the light source device according to Patent Document 4 faces the air intake port of the air-cooling fan 5 and radiates a plurality of blade pieces 41 around a central axis coaxial with the rotation axis of the air-cooling fan 5. The light-shielding device 4 is configured to be arranged. The plurality of blade pieces 41 of the light shielding device 4 have a blade row shape capable of guiding air so that the air flowing into the air cooling fan 5 has an appropriate inflow angle and blocking light from the lamp 3. ing. As a result, noise generated from the air cooling fan 5 is reduced and leakage of light emitted from the lamp 3 is prevented.

  As shown in FIG. 8, the light source unit according to Patent Document 5 is provided with an inlet 6 for cooling air on the wall surface of the lamp house 7, and an outlet 8 and a fan 2 for exhausting cooling air are installed at a downstream position. Then, a light shielding plate for shielding light leaked from the lamp 3 a is formed between the reflector-integrated lamp 3 and the fan 2. The first light shielding plate 4 extends in parallel to a direction perpendicular to the optical axis 10 and extends to a position where light incident obliquely through the gap between the light shielding plates reaches. The second light shielding plate 5 is formed substantially perpendicular to the first light shielding plate 4 so as to face the opening portion formed by the gap of the first light shielding plate 4 on the rear surface of the lamp house 7. This provides a light source unit that can block light from the light source without lowering the cooling efficiency of the fan.

JP-A-10-1865546 JP-A-10-90794 JP 2002-244213 JP 2003-157714 A JP 2002-352622 A

  However, the projector has the following problems. FIG. 9 is a diagram showing a configuration of a conventional projector. As shown in the figure, an operation button 14 is attached to the upper surface 12 of the main body case 10 of the projector. A front case 16 made of a resin material is incorporated on the front surface of the main body case 10. The front case 16 is formed with a plurality of horizontally long slit-like exhaust ports 18 and a projection lens housing portion 22 corresponding to the projection lens 20. An exhaust fan unit 26 is disposed in the case body 10 at a position adjacent to the projection light source unit 24. The exhaust fan unit 26 discharges the exhaust air that has cooled the light source unit 24 from the exhaust port 18.

  In such a configuration, part of the light from the light source unit 22 may leak to the outside from the exhaust port 18. If the light from the light source unit leaks, it is very annoying for the person viewing the projection image. If the light leaks in the direction of the projection lens 20, the projection image may be adversely affected.

  In response to such a problem, when the fan is tilted as in Patent Document 1, a dead space is generated inside, the projector body becomes larger than necessary, and the storage efficiency is lowered. Further, when a mechanism for driving a movable louver or an exhaust port cover is used as in Patent Document 2 and Patent Document 3, the apparatus becomes complicated and the cost becomes high. Furthermore, if many slits in the vertical direction are formed in a horizontally long projector body, the smartness of the design is lost.

  Further, when the light shielding device 4 is used as in Patent Document 4, light leakage from the lamp 3 cannot be completely prevented in a direction parallel to the angle of the blade piece 41. Further, when a plurality of light shielding plates extending in parallel with the optical axis 10 are shifted and arranged as in Patent Document 5, the cooling air 9 from the lamp 3 hits the light shielding plate substantially perpendicularly, so that the fluid flow is obstructed there. As a result, the cooling efficiency is not improved.

An object of the present invention is to solve the above-described conventional problems and to provide a light source unit having an exhaust structure capable of preventing light leakage of a light source and efficiently exhausting exhaust air with a simple configuration.
Furthermore, the present invention effectively cools the light source without impairing the degree of design freedom of the apparatus body, and substantially completely shields the light generated from the light source from leaking from the body exhaust and intake openings. Provided is a projector that can do this.

  A light source unit according to the present invention includes a light source including a lamp, an exhaust fan that is disposed on a first side of the light source and exhausts exhaust air that has cooled the light source, and a first that is disposed on an intake side of the exhaust fan. And a second air guide disposed on the exhaust side of the exhaust fan, wherein the first air guide includes a first plurality of louvers aligned at a first angle, The wind guide body includes a second plurality of louvers aligned at a second angle.

  Preferably, the first and second plurality of louvers are spaced apart in the vertical direction. The first angle is substantially orthogonal to the second angle. The first angle and the second angle may be in a relationship such that they are relatively square-shaped.

  Furthermore, a light source unit according to the present invention includes a light source including a lamp, an exhaust fan that is disposed on a first side of the light source and exhausts exhaust air that has cooled the light source, and a first that is disposed on an intake side of the exhaust fan. The third wind guide body includes a first plurality of louvers aligned at a first angle and a second plurality of louvers aligned at a second angle.

  Preferably, the light source unit further includes an intake air guide disposed on the second side of the light source, and the intake air guide has a plurality of substantially U-shaped fins. Further, the light source unit may further include a cooling fan for cooling the light source on the intake air guide.

  A projector according to the present invention houses a light source unit having the above characteristics, a modulation unit that modulates light from the light source unit, a projection unit that projects the modulated light, and a light source unit, modulation unit, and projection unit. And a main body. Preferably, in the case body, the exhaust port is formed at a position facing the exhaust fan, and the intake port is formed at a position facing the intake air guide.

  A light source unit according to the present invention uses an air guide body having a first louver aligned at a first angle and a second louver aligned at a second angle, and the exhaust fan that cools the light source is an exhaust fan. Therefore, the exhaust air can be efficiently exhausted to the outside, and the light from the light source is completely prevented from leaking to the outside. Furthermore, by using such a light source unit for a projector, it is possible to suppress abnormal heat generation of a light source, which is a heat source inside the projector, and to completely shut out leaked light.

  The light source unit according to the present invention is preferably used in a DLP projector. Hereinafter, it will be described in detail with reference to the drawings.

  FIG. 1 is a schematic side view showing a configuration of a light source unit according to a first embodiment of the present invention, and FIG. 2 is a plan view thereof. The light source unit 100 includes a light source 110, an exhaust unit 120 disposed on one side of the light source 110, and an intake unit 130 disposed on the other side of the light source 110. The light source 110 includes a discharge lamp 112 such as a mercury lamp and a reflector 114 that collects and reflects light emitted from the discharge lamp 112 in the optical axis direction.

  The exhaust unit 120 includes a pair of exhaust fans 122 and 124 using an axial fan or the like, and a pair of first and second air guide bodies 140 and 150. The first air guide body 140 is disposed on the intake side 120a of the exhaust fans 122 and 124, and the second air guide body 150 is disposed on the exhaust side 120b of the exhaust fan.

  FIG. 3 shows a detailed configuration of the exhaust unit. As shown in the figure, the frame 126 provides rectangular spaces 126a and 126b, and holds the outer periphery of the exhaust fans 122 and 124 in these spaces. The first air guide body 140 disposed on the intake side of the exhaust fans 122 and 124 has a pair of upper and lower connecting portions 142 and 144 and a plurality of louvers (blades) extending in the vertical direction fixed between the connecting portions. 146. Each louver 146 has a certain width and is attached so as to be aligned at a predetermined angle at a predetermined interval. Preferably, each louver 146 is aligned in a direction that forms an angle of 135 degrees with the optical axis I. The first air guide body 140 guides the fluid B (see FIG. 2) sucked into the exhaust fans 122 and 124 in the direction of the louvers 146 when the exhaust fans 122 and 124 are rotated, Light leakage from the air guide body 140 is shielded.

  The second air guide body 150 disposed on the exhaust side of the exhaust fans 122 and 124 includes a frame body 152 having substantially the same size as the frame body 126 and a plurality of louvers (blades) extending vertically in the frame body 152. 154. Each louver 154 has a certain width and is attached so as to be aligned at a predetermined angle at a predetermined interval. Preferably, each louver 154 is aligned in a direction that forms an angle of 45 degrees with the optical axis I. When the exhaust fans 122 and 124 are rotated, the fluid B exhausted from the exhaust fans 122 and 124 is guided in the direction of the louver 154, and the leakage light of the lamp is shielded.

  In the present embodiment, the louvers 146 and louvers 154 of the first and second air guide bodies 140 and 150 are in a relationship orthogonal to each other. For this reason, light leaking from the side of the lamp 112 is first blocked by the louver 146. Even if light passes through the louver 146, the light is blocked by the louver 154. Accordingly, light leaking from the side of the lamp 112 is not leaked to the outside.

  Returning to FIG. 1 again, the intake unit 130 disposed on the other side of the light source 110 includes an intake air guide 160 and an intake fan 170. FIG. 4 shows details of the intake air guide. As shown in the figure, the intake air guide body 160 has a plurality of plate-like fins 166 between an upper plate 162 and a lower plate 164. The plurality of fins 166 are bent in a U shape from the intake side 168a to the exhaust side 168b of the intake air guide. The cooling air A sucked from the intake side 168a is exhausted from the exhaust side 168b while being guided by the plurality of fins 166.

  An intake fan 170 is disposed on the upper plate 162. The intake fan 170 is configured using, for example, a sirocco fan. The intake fan 170 mainly cools the inside of the light source 110.

  Next, the operation will be described. When the light source 110 generates heat due to the lighting of the lamp 112, the exhaust fans 122 and 124 and the intake fan 170 are driven. These fans can be driven when the temperature of the light source 110 becomes equal to or higher than a certain temperature, or when a certain time has elapsed since the start of lighting of the lamp. When the exhaust fans 122 and 124 are driven, a fluid flow is generated, and the cooled cooling air A is taken in from the intake side 168a of the intake air guide body 160. The cooling air A is guided by a plurality of fins 166 in the intake air guide body 160, exhausted from the exhaust side 168 b, and supplied to the other side of the light source 110.

  The light source 110 is cooled by the cooling air A, and the cooling air A becomes high-temperature exhaust air B by heat exchange there, and is supplied to the first air guide body 140. The exhaust air B is guided by the louvers 146 of the first air guide body 140 and taken into the exhaust fans 122 and 124. The taken-in exhaust air B is forcibly exhausted by the exhaust fans 122 and 124, and the exhaust air B is guided and exhausted by the louvers 154 of the second air guide body 150.

  In addition to such an air supply / exhaust operation, in the light source unit 100 of the present embodiment, light leaked from the light source 110 is shielded. As described above, since the first and second air guide bodies 140 and 150 include the louvers 146 and 154 arranged at angles orthogonal to each other, the light leaked to the exhaust unit side of the lamp 112 is the louver 146. 154 is completely shielded from light. In addition, since the intake air guide body 160 includes a plurality of U-shaped fins 166, the light leaking to the intake unit 130 side of the lamp 112 is completely blocked by the fins 166.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the first and second air guides 140 and 150 are provided on the intake side 120a and the exhaust side 120b of the exhaust fan, respectively. However, in the second embodiment, the intake side 120a of the exhaust fan is provided on the intake side 120a. A third wind guide body 180 having both functions of the first and second wind guide bodies is disposed.

  FIG. 5 is a diagram showing the configuration of the exhaust unit according to the second embodiment. As shown in the figure, the third air guide body 180 is disposed on the intake side of the exhaust fans 122 and 124. The third air guide body 180 includes two sets of louvers 182 and 184, the first louver 182 is aligned at an angle of 45 with the optical axis I, and the second louver 184 is aligned with the optical axes I and 135. They are aligned to form an angle. With this configuration, the exhaust air guide and the leakage light can be shielded as in the first embodiment. And the exhaust unit can be made more compact than in the first embodiment.

  Next, a configuration when the light source unit of this embodiment is applied to a projector is shown in FIG. As shown in FIG. 6A, the light source unit 100 is disposed in the case main body 200 of the projector. The case body 200 can be made of, for example, a magnesium alloy. Or you may comprise using the front case of a resin material as shown in FIG. An intake port 204 is formed on a side surface 202 of the case body 200 facing the intake unit 130. As shown in FIG. 6B, the air inlet 204 is composed of a plurality of parallel slits 206 extending in the horizontal direction.

  In addition, an exhaust port 214 is formed on a side surface 212 of the case body 200 facing the exhaust unit 120. The exhaust port 124 is configured by a plurality of slit-shaped openings as shown in FIG.

  When the lamp of the light source 110 is turned on during operation of the projector, the intake unit 130 takes in the cooling air A from the intake port 204. The cooling air A passes through the intake air guide 160 and cools the light source 110 that is a heat source. The cooled exhaust air B is exhausted from the exhaust port 214 by the exhaust fans 122 and 124 via the first and second air guides. The exhaust air B is exhausted in a direction away from the projection lens depending on the angle of the louver 154 of the second air guide body 150.

  As described above, the slit-like intake port 204 is formed on the side surface 202 of the case body 200, but light leaked from the lamp 112 is blocked by the plurality of U-shaped fins 166 of the intake air guide body 160. Therefore, the air is not leaked from the intake port 204 to the outside. Similarly, a slit-like exhaust port 214 is formed on the side surface 212 of the case body 200, but the light leaked from the lamp 112 is the first and second of the first and second air guides 140 and 150. Since the light is shielded by the louvers 146 and 154, the air is not leaked from the exhaust port 214 to the outside.

  Although the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the specific embodiment, and various modifications, within the scope of the gist of the present invention described in the claims, It can be changed. The number of louvers used in the first and second wind guides and the third wind guide can be changed as appropriate according to design matters. Also, the type and number of fans can be appropriately changed according to the design matters.

  The light source unit according to the present invention can be used in an image display apparatus such as a projector or a television using DMD, liquid crystal, or other modulation elements.

It is a schematic side view which shows the structure of the light source unit which concerns on the Example of this invention. It is a top view of the light source unit which concerns on the Example of this invention. It is a perspective view which shows the structure of an exhaust unit. It is a figure which shows the detail of a wind guide body for intake, and is a figure which shows a front view and its both side views. It is a figure which shows the structure of the exhaust unit by the 2nd Example of this invention. FIG. 6 is a diagram illustrating a state in which the light source unit according to the first embodiment is applied to a projector, in which FIG. 6A is a schematic plan view illustrating an internal configuration, and FIG. 6B is a diagram illustrating an air supply / exhaust port. It is a figure which shows the structural example of the conventional light source device. It is a figure which shows the structural example of the conventional light source unit. It is a figure which shows the structural example of the conventional projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100: Light source unit 110: Light source 112: Lamp 114: Reflector 120: Exhaust unit 122, 124: Exhaust fan 126: Frame body 130: Intake unit 140: 1st air guide body 142, 144: Connection part 146: 1st louver 150: second air guide body 152: frame body 154: second louver 160: air guide body for intake air 166: fin 170: intake fan 180: third air guide body 182: first louver 184: second louver 200 : Case body 204: Intake port 214: Exhaust port

Claims (8)

A light source including a lamp;
An exhaust fan that is disposed on the first side of the light source and exhausts the exhaust air that has cooled the light source;
A first air guide disposed on the intake side of the exhaust fan;
A second air guide disposed on the exhaust side of the exhaust fan,
The first light guide includes a first plurality of louvers aligned at a first angle, and the second wind guide includes a second plurality of louvers aligned at a second angle. The light source unit according to claim 1, wherein the first and second plurality of louvers are spaced apart in the vertical direction. The light source unit according to claim 1, wherein the first angle is substantially orthogonal to the second angle. A light source including a lamp;
An exhaust fan that is disposed on the first side of the light source and exhausts the exhaust air that has cooled the light source;
A third air guide disposed on the intake side of the exhaust fan,
The third air guide includes a first plurality of louvers aligned at a first angle and a second plurality of louvers aligned at a second angle. The light source unit further includes an intake air guide disposed on the second side of the light source, and the intake air guide includes a plurality of substantially U-shaped fins. Light source unit described in The light source unit according to any one of claims 1 to 5, further comprising a cooling fan for cooling the light source on the intake air guide. A light source unit according to any one of claims 1 to 6,
Modulation means for modulating light from the light source unit;
Projection means for projecting the modulated light;
A projector including a light source unit, a modulation unit, and a case main body that houses the projection unit. 8. The projector according to claim 7, wherein the case body has an exhaust port formed at a position facing the exhaust fan and an air intake port formed at a position facing the intake air guide body.

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