JP2005274735A - Light source device and projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the factor causing the blackening, whitening, extinction or the like in a luminous lamp since the luminous lamp can not efficiently be cooled only by introducing the open air inside a reflection mirror, and the temperature of the luminous lamp rises more than guaranteed temperature to shorten the service life of the luminous lamp unanticipatedly. <P>SOLUTION: This light source device is provided with: the reflection mirror 1 whose shape at vertical cross section forms approximate U-shape and whose side on the opening side an inlet 2a and an outlet 2b are provided; a metal halide lamp 5 installed at a center part of the reflector; and an air intake duct 12 provided outside the inlet 2a to guide the open air in the reflection mirror 1. The air intake duct 12 is arranged by inclining an introduction angle α of the open air by a predetermined angle to a light axis of the metal halide lamp 5 so as to guide the open air to the metal halide lamp 5 and to generate convection of the air inside the reflector 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light source device including a reflecting mirror having a suction port and an exhaust port, a light-emitting lamp, a suction duct, and the like, and a projection display device including the light source device, and more particularly, to a suction duct provided at the suction port of the reflecting mirror. By providing the introduction angle of the outside air introduced from the inclined angle with respect to the optical axis of the light-emitting lamp, the air inside the reflector is convected by the introduced air to improve the heat dissipation efficiency of the light-emitting lamp. The present invention relates to a light source device and a projection display device.

  As an example of a light source device used in a conventional projection display device, for example, there is one described in Patent Document 1. Patent Document 1 describes a lamp cooling structure suitably used for a projection type image display device such as a liquid crystal projector. In this lamp cooling structure, the arc tube is held inside and is disposed so as to surround the arc tube, the reflector whose inner peripheral surface is a reflection surface, and the reflector to which the light from the arc tube is irradiated A lamp body having a lens provided on the front end surface, a lamp storage container for storing the lamp body at an appropriate interval, and a front end portion of the lamp storage container so that air flows into the lamp body An air intake port provided in the lamp body, an air discharge port provided in a rear end portion of the lamp body so that air inside the lamp body flows out, and a blower for exhausting the inside of the lamp storage container. It is characterized by having.

  According to the lamp cooling structure having such a configuration, the cooling air flows through the outside and the inside of the reflector of the lamp body, and the cooling air flowing through the inside of the reflector is discharged from the neck. Therefore, an effect such as efficient cooling of the lamp body including the neck as the arc tube mounting portion is expected.

  As another example of the conventional light source device, for example, there is a device described in Patent Document 2. Patent Document 2 describes a light source unit mainly used for a liquid crystal projector or the like using a short arc type mercury lamp, a metal halide lamp or the like as a light source. The light source unit includes a light source, a concave reflecting mirror whose front end surface is opened as a light emitting surface, a rear end portion facing the emitting surface is a concave reflecting surface, and the light source is fixed to the rear end portion. A first front cover provided at a front end portion of the concave reflecting mirror so as to cover a light emitting surface of the concave reflecting mirror, and the concave surface in a state where a predetermined interval is provided on the front side of the first front cover. A second front cover provided at the front end of the reflecting mirror, and an air intake port for taking in air from the outside between the first front cover and the second front cover at the front end of the concave reflecting mirror. And an air inflow port for allowing air to flow into the concave reflecting mirror is provided at a predetermined position of the first front cover.

  According to the light source unit having such a configuration, the second front cover can prevent debris from being scattered due to rupture of the light emitting tube of the light source, and the air flow provided from the air intake to the first front cover. It is expected that air can be introduced into the concave reflecting mirror from the outside through the inlet, and the inside of the concave reflecting mirror can be efficiently cooled.

  As another example of the conventional light source device, for example, there is a device described in Patent Document 3. Patent Document 3 describes a metal halide lamp device including a metal halide lamp and a blowing means for cooling the lamp. This metal halide lamp device is a metal halide lamp device including a metal halide lamp configured only by an arc tube without providing an outer tube, and an air blowing means for cooling the lamp. It is equipped with a control device that increases immediately.

According to the metal halide lamp device having such a configuration, it is expected that the metal halide lamp device capable of shortening the restart time and reducing the restart application pulse can be easily realized. .
JP 2002-245842 A JP 2002-260437 A JP-A-5-135745

  However, in the conventional light source device as described above, in the case of the invention described in any one of Patent Documents 1 to 3, the rod-shaped metal halide lamp is formed at the inner central portion of the reflecting mirror having a substantially hemispherical shell shape. It was attached, and air intakes were provided at a plurality of locations on the side surface on the opening side of the reflecting mirror. Then, external air is introduced and circulated into the reflecting mirror by the blower fan, the heat of the metal halide lamp that has become high temperature due to light emission is taken away by the air, and the warmed air is converted into the case of Patent Documents 1 and 2. Is discharged backward from the outlet of the central part of the reflecting mirror provided in the support portion of the metal halide lamp, and in the case of Patent Document 3, it is discharged laterally from the outlet provided on the side of the reflecting mirror. The lamp was supposed to cool.

  Therefore, in the case of the lamp cooling structure described in Patent Document 1 and the light source unit described in Patent Document 2, an outlet for exhausting air is provided at the center of the reflecting mirror. Although it is possible to cool the entire metal halide lamp including the light emitting portion that becomes high temperature uniformly, a ring-shaped non-reflective surface is formed at the center of the reflecting mirror by the outlet. As a result, there is a problem that a ring-like low-brightness portion with low brightness occurs due to the non-reflecting surface by the outlet of the reflecting mirror, and a part of the image projected on the screen is lost.

  Further, in the case of the metal halide lamp device described in Patent Document 3 described above, an air intake and an outlet are provided on the side of the opening side of the reflecting mirror so as to face each other. The cooling air is circulated in a direction orthogonal to the axial direction of the lamp. Therefore, the air supplied from the intake port moves straight to the outlet side, and a portion where the air does not flow is generated in the central portion of the reflecting mirror. As a result, only the front sealing portion of the metal halide lamp is cooled, and there is a problem that the light emitting portion having the highest temperature in the center and the rear sealing portion continuous to the light emitting portion are not cooled.

  In this case, the guaranteed temperature of the metal halide lamp is generally 800 to 900 ° C., but the temperature of the metal halide lamp that is actually used varies depending on the part, and the central light emitting part (electrode burner part) is the highest. The next was the rear sealing part (electrode glass part), and the front sealing part (glass part) had the lowest temperature. This is because the light emitting part at the center of the metal halide lamp is a heat source, and cooling air is supplied only to the front sealing part side in the reflector, and the air inside it remains in the center part without moving. This is because only the front sealing portion is cooled without cooling the light emitting portion and the rear sealing portion, and the temperature of the light emitting portion and the rear sealing portion rises above the guaranteed temperature.

  As a result, it becomes difficult to control the temperature of the light emitting part and the rear sealing part that require temperature management to be below the temperature range of 800 to 900 ° C., which is the guaranteed temperature, and blackening, whitening, It was a factor causing various problems such as light loss. As a result, the above-described problems occur earlier than the expected life of the metal halide lamp, and the life of the light emitting lamp is shortened.

  The problem to be solved is that the light emitting lamp cannot be efficiently cooled simply by introducing outside air into the reflecting mirror, and the temperature of the light emitting lamp rises above the guaranteed temperature. Is a factor that causes various problems such as blackening, whitening, and loss of light in the light-emitting lamp.

  The light source device according to claim 1 of the present invention has a reflecting mirror having a substantially U-shaped longitudinal cross-section and provided with an intake port and an exhaust port on the side surface on the opening side, and is attached to a central portion of the reflecting mirror. And an intake duct provided outside the intake port for guiding outside air into the reflector. The intake duct guides outside air to the lamp and causes convection of air inside the reflector. The main feature is that the introduction angle of the outside air is inclined at a predetermined angle with respect to the optical axis of the light emitting lamp.

  The light source device according to claim 2 of the present invention has a reflecting mirror having a substantially U-shaped longitudinal cross-section and provided with an intake port and an exhaust port on a side surface on the opening side, and is attached to a central portion of the reflecting mirror. A light emitting lamp, an intake duct provided outside the intake port to guide the outside air into the reflector, and a blowing means for introducing the outside air into the reflector through the intake port and exhausting it from the exhaust port. The main feature of the duct is that the introduction angle of the outside air is inclined at a predetermined angle with respect to the optical axis of the light emitting lamp so that the outside air is guided to the light emitting lamp and air convection is generated inside the reflecting mirror. .

  The light source device according to claim 3 of the present invention is characterized in that the introduction angle of the outside air in the intake duct is in the range of 3 degrees to 12 degrees with respect to the optical axis of the light emitting lamp.

  The light source device according to claim 4 of the present invention is characterized in that the opening-side end of the reflecting mirror is closed by a transparent front cover.

  The light source device according to claim 5 of the present invention is characterized in that the exhaust port is disposed at a position facing the intake port.

  The projection display device according to claim 6 of the present invention is displayed on the image display unit by an image display unit that displays an image, a light source device that emits light to the image display unit, and light from the light source device. In a projection display device having a lens device for enlarging and projecting an image on a screen, the light source device has a substantially U-shaped longitudinal section, and an intake port and an exhaust port are provided on the side surface on the opening side. A reflecting mirror, a light emitting lamp attached to the central portion of the reflecting mirror, and an air intake duct provided outside the air inlet for guiding the outside air into the reflecting mirror. The main feature is that the introduction angle of the outside air is inclined at a predetermined angle with respect to the optical axis of the light-emitting lamp so that air convection is generated inside the reflecting mirror.

  The projection display device according to claim 7 of the present invention is characterized in that the light source device further includes a blowing means for introducing outside air into the reflecting mirror through the intake port and exhausting it from the exhaust port.

  The projection display device according to claim 8 of the present invention is characterized in that the introduction angle of the outside air in the intake duct is in the range of 3 degrees to 12 degrees with respect to the optical axis of the light emitting lamp.

  The projection display device according to claim 9 of the present invention is characterized in that the opening-side end of the reflecting mirror is closed by a transparent front cover.

  The projection display device according to claim 10 of the present invention is characterized in that the exhaust port is disposed at a position facing the intake port.

  In the projection display device according to claim 11 of the present invention, the screen is installed outside or inside the housing in which the image display unit, the light source device, and the lens device are housed. It is a feature.

  According to the light source device of the first aspect of the present invention, in the light source device including the reflecting mirror having the intake port and the exhaust port, the light emitting lamp, and the intake duct, introduction of the outside air into the intake duct that guides the outside air into the reflector. Since the angle is set to be inclined at a predetermined angle with respect to the light emitting lamp, when outside air is introduced into the reflecting mirror from the intake duct, the outside air is circulated inside the reflecting mirror depending on the introduction angle of the intake duct. As a result, cold air is guided to the high temperature part of the light emitting lamp, and the high temperature part can be directly cooled and air convection can be generated inside the reflecting mirror. As a result, the air heated by the heat generated by the light-emitting lamp can be moved to the exhaust port side, the heat dissipation efficiency of the light-emitting lamp can be increased, the temperature control of the light-emitting lamp can be easily performed, and the life of the light-emitting lamp can be increased. Can be long.

  According to the light source device of the second aspect of the present invention, in addition to the reflecting mirror, the light emitting lamp, and the intake duct, there is provided air blowing means for introducing outside air into the reflecting mirror from the intake port and exhausting it from the exhaust port. The outside air is introduced at a predetermined angle with respect to the optical axis of the light-emitting lamp, so that when outside air is introduced from the intake duct into the reflector, the outside air is introduced into the reflector by the introduction angle of the intake duct. It is forcibly distributed. As a result, cold air is guided to the high temperature part of the light emitting lamp, and the high temperature part can be directly cooled and air convection can be generated inside the reflecting mirror. As a result, the air heated by the heat generated by the light-emitting lamp can be forcibly moved to the exhaust port side, the heat dissipation efficiency of the light-emitting lamp can be increased, and the temperature control of the light-emitting lamp can be easily performed. Can extend the lifetime of

  According to the light source device of the third aspect of the present invention, by setting the introduction angle of the outside air in the intake duct within the range of 3 degrees to 12 degrees, the outside air can be smoothly supplied to the high temperature portion of the light emitting lamp in the reflector. In addition, the high temperature portion of the light emitting lamp can be directly cooled, and air convection can be generated inside the reflecting mirror to increase the heat dissipation efficiency of the light emitting lamp.

  According to the light source device according to claim 4 of the present invention, the convection of the air can be generated inside the reflecting mirror by surrounding the periphery of the light emitting lamp by closing the opening side end of the reflecting mirror with the front cover. It is possible to efficiently stir the internal air and efficiently discharge the air heated by the heat radiation of the light emitting lamp from the exhaust port.

  According to the light source device of the fifth aspect of the present invention, by arranging the exhaust port at a position facing the intake port, the air that has been warmed and convected in the reflecting mirror can be smoothly discharged to the outside.

  According to the projection display device of the sixth aspect of the present invention, in the projection display device including the image display device, the light source device, and the lens device, the outside air introduction angle in the intake duct that guides the outside air into the reflecting mirror is set. Since it is configured to be inclined at a predetermined angle with respect to the light emitting lamp, when outside air is introduced into the reflecting mirror from the intake duct, the outside air is circulated inside the reflecting mirror depending on the introduction angle of the intake duct. As a result, cold air is guided to the high temperature part of the light emitting lamp, and the high temperature part can be directly cooled and air convection can be generated inside the reflecting mirror. As a result, the air heated by the heat generated by the light-emitting lamp can be moved to the exhaust port side, the heat dissipation efficiency of the light-emitting lamp can be increased, the temperature control of the light-emitting lamp can be easily performed, and the life of the light-emitting lamp can be increased. A projection display device that can be lengthened can be provided.

  According to the projection display device of the seventh aspect of the present invention, in the light source device among the image display device, the light source device, and the lens device, in addition to the reflecting mirror, the light emitting lamp, and the intake duct, the outside air is reflected from the intake port. Since it has a configuration in which air blowing means is provided to be introduced into the exhaust duct and exhausted from the exhaust port, and the outside air introduction angle in the intake duct is inclined by a predetermined angle with respect to the optical axis of the light emitting lamp, the outside air is introduced into the reflector from the intake duct. When introduced, the outside air is forcibly circulated inside the reflector according to the introduction angle of the intake duct. As a result, cold air is guided to the high temperature part of the light emitting lamp, and the high temperature part can be directly cooled and air convection can be generated inside the reflecting mirror. As a result, the air heated by the heat generated by the light-emitting lamp can be forcibly moved to the exhaust port side, the heat dissipation efficiency of the light-emitting lamp can be increased, and the temperature control of the light-emitting lamp can be easily performed. It is possible to provide a projection display device capable of extending the life of the projector.

  According to the projection type display device of the present invention, the outside air is introduced to the high temperature portion of the light emitting lamp in the reflector by setting the outside air introduction angle of the intake duct within a range of 3 degrees to 12 degrees. It is possible to provide a projection display device that can be smoothly guided, can directly cool the high temperature portion of the light emitting lamp, and can increase the heat dissipation efficiency of the light emitting lamp by generating convection of air inside the reflecting mirror. .

  According to the projection type display device of the ninth aspect of the present invention, by closing the opening-side end portion of the reflecting mirror with the front cover, air convection is generated in the reflecting mirror surrounding the light emitting lamp. In addition, it is possible to provide a projection display device that can sufficiently discharge the air heated by the heat radiation of the light-emitting lamp from the exhaust port by sufficiently stirring the internal air.

  According to the projection display device of the tenth aspect of the present invention, by arranging the exhaust port at a position facing the intake port, the projection type that can smoothly discharge the convection air warmed in the reflecting mirror to the outside. A display device can be provided.

  According to the projection display device of the eleventh aspect of the present invention, the screen can be configured as a front type video projector by disposing the screen outside the casing, and the screen can be disposed inside the casing. Thus, it can be configured as a rear type video projector.

  By inclining the introduction angle of the air introduced from the intake duct into the reflecting mirror by a predetermined angle with respect to the optical axis of the light-emitting lamp, the introduced air can be guided to the light-emitting lamp to promote cooling and reflected by the air. A light source device and a projection display device capable of efficiently exhausting air heated by heat radiation of the light-emitting lamp by convection of air inside the mirror from the exhaust port have been realized with a simple configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIGS. 1 to 9 illustrate an embodiment of a light source device according to the present invention. FIG. 1 is a perspective view of a reflecting mirror viewed from the back side, and FIG. 3 is an explanatory diagram in which the introduction angle of the intake duct is inclined with respect to the lamp optical axis, FIG. 4 is an explanatory diagram in which the introduction angle of the intake duct is parallel to the lamp optical axis (α = 0 degrees), and FIG. FIG. 6 is an explanatory diagram showing the air volume and direction of the introduction angle α = 5 degrees, and FIG. 7 is an explanatory diagram showing the air volume and direction of the introduction angle α = 10 degrees. FIG. 8 is an explanatory diagram showing the air volume and direction of the introduction angle α = 15 degrees, and FIG. 9 is an explanatory diagram showing the air volume and direction of the introduction angle α = 40 degrees.

  10 to 12 illustrate examples of the present invention. FIG. 10 is a perspective view showing a first embodiment of a projection display apparatus using the light source device of the present invention. FIG. FIG. 12 is a perspective view showing a second embodiment of the projection display apparatus using the light source device of the present invention.

  The first embodiment of the reflecting mirror according to the light source device of the present invention has a configuration as shown in FIG. That is, the reflecting mirror 1 is made of a cup-shaped member having a substantially U-shaped longitudinal section, and a pipe-shaped lamp holding portion 1a is provided at the center thereof so as to penetrate in the front-rear direction. At the end of the reflecting mirror 1 on the opening side, a frame body portion 1b having a substantially rectangular shape is provided. Furthermore, openings 2a, 2b, 2c, and 2d are provided at a total of four locations on the inner side of the frame 1b of the reflecting mirror 1 in the vertical and horizontal directions. The four openings 2a, 22b, 2c, and 2d each have a semicircular shape, and the opening 2a provided on the upper surface is used as an intake port, and the opening 2b provided on the lower portion is used as an exhaust port. ing. Note that the two openings 2c and 2d provided on the left and right sides are respectively closed by appropriate members, and are not used as intake ports or exhaust ports in this embodiment.

  The inner surface of the reflecting mirror 1 is formed into a spherical shape by a circular, elliptical, parabolic, quadratic curve or other appropriate curve. The inner surface 3 of the reflecting mirror 1 is mirror-finished by, for example, vacuum deposition of aluminum so that light can be reflected well. A transparent front cover 4 that transmits light well is attached to the frame 1b of the reflecting mirror 1. The front cover 4 is overlapped and joined to the frame body portion 1b by an adhesive or other fixing means, and is fixed integrally. As a material of the reflecting mirror 1, for example, ceramics or heat-resistant tempered glass is suitable. Moreover, as a material of the front cover 4, for example, heat-resistant tempered glass or heat-resistant reinforced plastic is suitable.

  A metal halide lamp 5 made of a short arc type arc tube showing a specific example of the light-emitting lamp is attached to the lamp holding portion 1 a of the reflecting mirror 1. The metal halide lamp 5 is composed of a high-pressure mercury lamp, and is composed of a bulb 6 made of a linearly extending glass tube, a pair of discharge electrodes and the like housed in the bulb 6, and a base 7 for holding the bulb 6. Has been. A light emitting portion 6a that swells in a spherical shape is provided in the middle portion of the bulb 6 in the axial direction, and a pair of discharge electrodes are disposed in the light emitting portion 6a so as to face each other with a predetermined gap. A space between the light emitting portion 6a and the base 7 is a rear sealing portion 6b, and a tip end side of the light emitting portion 6a opposite to the light emitting portion 6a is a front sealing portion 6c.

  Of the pair of discharge electrodes in the bulb 6, the rear discharge electrode is connected to the rear lead wire 8 led out from the base 7, and the front discharge electrode is led out from the tip of the front sealing portion 6c. It is connected to a front lead wire (not shown). The front lead wire is stretched over the spherical surface portion of the reflecting mirror and led out to the outer surface of the reflecting mirror from a through hole provided in the spherical surface portion. The lead-out end connects the front lead wire to the power source, and the lead-out end from the base 7 connects the rear lead wire 8 to the power source.

  The reflecting mirror 1 having such a configuration is housed and fixed in a housing 10 as shown in FIGS. 3 and 4. The housing 10 has a front opening 11 that faces the front cover 4, an intake duct 12 for introducing outside air into the reflecting mirror 1, and an exhaust duct 13 for discharging the air in the reflecting mirror 1 to the outside. And a large number of air holes 14 communicating with the inside and outside of the housing 10 are provided. The intake port 2 a of the reflector 1 is opposed to the inner opening 12 a of the intake duct 12 of the housing 10, and the exhaust port 2 b of the reflector 1 is opposed to the inner opening 13 a of the exhaust duct 13.

  Regarding the intake duct 12 of the housing 10, the distribution state of the air flowing inside the reflecting mirror 1 is tested by the difference of the outside air introduction angle α with respect to the optical axis (center line of the bulb 6) C of the metal halide lamp 5 which is a light emitting lamp. It was measured by. Then, when the outside air introduction angle α of the intake duct 12 is changed, it is confirmed how the air flows in the reflecting mirror 1 and how the air flow hits the light emitting lamp. did. FIG. 3 shows the air flow in the reflecting mirror 12 when the center line L of the intake duct 12 is inclined at an angle with respect to the optical axis C of the light-emitting lamp and the outside air is introduced at an angle. FIG. On the other hand, FIG. 4 is a diagram showing the flow of air in the reflecting mirror 12 when the intake duct 12 is provided in parallel with the optical axis C of the light-emitting lamp and outside air is introduced from a direction substantially orthogonal to the optical axis C. .

  In this case, an opening hole provided on the upper surface of the reflecting mirror 1 is used as an intake port 2a, and the intake duct 12 is opposed to the intake port 2a, and an opening hole provided on the lower surface facing the intake port 2a in the vertical direction is an exhaust port. The test was conducted as 2b. Air was blown into the intake duct 12 at a uniform wind speed of 2 m / s in each test. At this time, it was assumed that there was no air leakage between the intake duct 12 and the reflecting mirror 1. The test results are shown in FIGS.

  FIG. 5 shows the flow of air in the reflecting mirror 12 when the outside air introduction angle α is 0 degrees, that is, when the center line L of the intake duct 12 is parallel to the optical axis C of the metal halide lamp 5. FIG. The air introduced from the intake duct 12 moves along the inner surface 3 of the reflecting mirror 1 and enters deeply, and most of the air is a light emitting part (burner part) 6a of the bulb 6 and a rear sealing part (electrode glass part). ) 6b. Further, the air moves along the inner surface 3 of the reflecting mirror 1, reaches the exhaust port 2, and is discharged outside. At this time, the wind speed of the air sprayed on the light emitting part 6a changed within the range of 0.88 to 2.33 m / s from the analysis result.

  As apparent from FIG. 5 and the like, when the outside air introduction angle α is 0 degree, the front-side sealing portion which is the front end side of the bulb 6 is blown from the light-emitting portion 6a to the rear rear-side sealing portion 6b. (Glass part) 6c was in a state of almost no wind. Further, when the air output (wind speed) was changed in this state, the temperature increased or decreased after the light emitting portion 6a, but the temperature did not change at the front sealing portion 6c. From the above, when the outside air introduction angle α is 0 degree, it is difficult to control the temperature of the metal halide lamp 5 only by the circulation of air (cooling medium).

  FIG. 6 shows the reflecting mirror 12 when the outside air introduction angle α is 5 degrees, that is, when the center line L of the intake duct 12 intersects the optical axis C of the metal halide lamp 5 at an inclination angle of 5 degrees. It is a figure which shows the flow of the air inside. The air introduced from the intake duct 12 moves over the entire interior of the reflecting mirror 1 and strikes the entire bulb 6 approximately equally. Further, the air as a whole moves toward the exhaust port 2, reaches the exhaust port 2 from there, and is discharged to the outside. At this time, the wind speed of the air near the light emitting portion 6a and the rear sealing portion 6b was in the range of 1.76 to 2.34 m / s.

  As is clear from FIG. 6 and the like, when the outside air introduction angle α is 5 degrees, the entire bulb 6 (from the front side sealing portion 6c through the light emitting portion 6a to the rear side sealing portion 6b) is substantially uniform. Air began to flow as the wind hit. When the air output (wind speed) is changed in this state, the entire temperature from the front side sealing portion 6c of the bulb 6 to the rear side sealing portion 6b through the light emitting portion 6a is increased or decreased substantially uniformly. It became easy.

  FIG. 7 is a diagram showing the flow of air in the reflecting mirror 12 in a state where the introduction angle α of outside air is 10 degrees. In this case, it was substantially the same as when the outside air introduction angle α was 5 degrees. The air introduced from the intake duct 12 moves over the entire interior of the reflecting mirror 1 and strikes the entire bulb 6 approximately equally. Further, the air as a whole moves toward the exhaust port 2, reaches the exhaust port 2 from there, and is discharged to the outside. At this time, the wind speed of the air near the light emission part 6a and the rear side sealing part 6b was in the range of 1.552-3.24 m / s.

  As apparent from FIG. 7 and the like, even when the introduction angle α of the outside air is 10 degrees, the air flow is substantially uniform from the front sealing portion 6c of the bulb 6 to the rear sealing portion 6b through the light emitting portion 6a. The air began to flow as if hitting. By changing the air output (wind speed) in this state, the overall temperature from the front sealing portion 6c to the rear sealing portion 6b of the valve 6 is changed substantially uniformly, so that temperature control can be easily performed. Can now.

  FIG. 8 is a diagram showing the flow of air in the reflecting mirror 12 in a state where the outside air introduction angle α is 15 degrees. In this case, the air flow is slightly improved as compared with the case where the outside air introduction angle α is 0 degree, but it is still stronger and faster than the front sealing portion 6c from the light emitting portion 6a to the rear sealing portion 6b. It was flowing. At this time, the wind speed of the air near the light emitting part 6a and the rear sealing part 6b was in the range of 0.55 to 2.02 m / s.

  As apparent from FIG. 8 and the like, when the outside air introduction angle α is as large as 15 degrees, the wind strongly hits the rear rear sealing portion 6b from the light emitting portion 6a, and the front sealing portion which is the front end side of the bulb 6 The wind hitting 6c became weaker. For this reason, even if the air output (wind speed) is changed in this state, a relatively large change in temperature is seen behind the light emitting part 6a, but the change in temperature is small in the front sealing part 6c. It was. From the above, when the outside air introduction angle α is 15 degrees, it is difficult to control the temperature of the metal halide lamp 5 only by circulating air (cooling medium).

  FIG. 9 is a diagram illustrating the flow of air in the reflecting mirror 12 in a state where the outside air introduction angle α is set to 40 degrees. In this case, the flow of air was only the front sealing portion 6c of the bulb 6, and almost no wind flow from the light emitting portion 6a to the rear rear sealing portion 6b. At this time, the wind speed in the vicinity of the front sealing portion 6c was about 3 m / s, but the wind speed in the vicinity of the light emitting portion 6a and the rear sealing portion 6b was within a range of 0.73 to 0.98 m / s. It was close to a windless state.

  As apparent from FIG. 9 and the like, when the outside air introduction angle α is as large as 40 degrees, the wind does not hit the rear rear sealing portion 6b from the light emitting portion 6a at all. Even when the wind speed) was changed, there was no increase or decrease in the temperature behind the light emitting portion 6a. As described above, when the outside air introduction angle α is 40 degrees, it is extremely difficult to control the temperature of the metal halide lamp 5 only by circulating air (cooling medium).

  In view of the above test, the air introduced into the reflector 1 is guided to the metal halide lamp 5 by setting the outside air introduction angle α of the intake duct 12 to 3 to 12 degrees, preferably 5 to 10 degrees. The cooling of the metal halide lamp 5 can be promoted. Moreover, it has been clarified that the air heated by the heat radiation of the metal halide lamp 5 can be efficiently exhausted from the exhaust port by convection of the air inside the reflector 1 with the air flow.

  The light source device having the configuration as described above can be used, for example, as shown in FIGS. 10 and 11 show a front type video projector according to a first embodiment of the projection type display apparatus using the light source device having the above-described configuration. FIG. 12 also shows a rear type video projector according to a second embodiment of the projection display apparatus.

  The front-type video projector 20 is used in a stationary manner on a desk, table, or the like, and includes an outer case 21 made of a rectangular casing as shown in FIGS. A light source device 22, an optical prism unit 23, a lens device 24, a fan device 25 and the like having the above-described configuration are housed in an outer case 21 of the front video projector 20.

  A lens hole 26 is provided in the front surface portion 21a of the exterior case 21, an intake window 27 is provided in one of the pair of side surface portions 21b and 21c, and an exhaust window 28 is provided in the back surface portion 21d. The front surface portion 21a of the outer case 21 is a horizontally long rectangle, and the tip of the lens device 23 is exposed in a lens hole 26 provided at a position deviated in the longitudinal direction from the center. The lens device 23 includes a lens group 30 composed of a combination of a plurality of lenses, a lens barrel 31 that holds the lens group 30, and the like.

  The opening window 27 of the side surface portion 21 b is for taking outside air into the exterior case 21 and is provided in the vicinity of the lens hole 26. Inside the opening window 27 is provided a fan device 25 that takes in outside air and cools the optical prism unit 23 and the like to flow cooling air into the exterior case 21. The discharge port 33 of the fan device 25 is arranged side by side with the inner opening of the lens barrel 31.

  The optical prism unit 23 includes a cross dichroic prism 35, three liquid crystal panels 36, 37, 38, five condenser lenses 40, 41, 42, 43, 44, three total reflection mirrors 45, 46, 47, two dichroic mirrors 48 and 49, a polarization conversion element 51, a lens array 52, and the like. The cross dichroic prism 35 is a planar square prism assembly in which four triangular prisms are combined, and is arranged so that one optical axis coincides with the optical axis of the lens group 30. That is, one of the four surfaces of the cross dichroic prism 35 is opposed to the base end of the lens group 30 of the lens device 24, and the liquid crystal panels 36, 37, and 38 are individually opposed to the other three surfaces. ing.

  The first liquid crystal panel 36 transmits only blue light (B), the second liquid crystal panel 37 transmits only green light (G), and the third liquid crystal panel 38 transmits only red light (R). Condensing lenses 40, 41, and 42 are individually arranged opposite to the outside of the liquid crystal panels 36, 37, and 38. A first total reflection mirror 45 inclined at 45 degrees is disposed outside the first condenser lens 40, and the first dichroic mirror 48 is parallel to each other so as to face the first total reflection mirror 45. Is arranged. A second dichroic mirror 49 inclined at 45 degrees is arranged outside the second condenser lens 41 so as to be parallel to the first dichroic mirror 48.

  Further, a second total reflection mirror 46 that is inclined by 45 degrees on the opposite side of the first total reflection mirror 45 is disposed outside the third condenser lens 42, and faces the second total reflection mirror 46. The third total reflection mirror 47 is arranged to face the second total reflection mirror 46 with an inclination angle of 90 degrees. Therefore, the third total reflection mirror 47 is disposed so as to be parallel to the second dichroic mirror 49. A fourth condenser lens 43 is disposed between the second total reflection mirror 46 and the third total reflection mirror 47, and a fifth condenser lens is disposed between the third total reflection mirror 47 and the second dichroic mirror 49. 44 is arranged.

  The third total reflection mirror 47 and the first and second dichroic mirrors 48 and 49 are arranged so that their optical axes are the same, and the polarization conversion element and the lens array 52 are arranged on the extension line. Yes. The light source device 22 is disposed outside the lens array 52. The opening side of the reflecting mirror 1 of the light source device 22 is opposed to the lens array 52, and the intake duct 12 is opposed to the intake port 2 a of the reflecting mirror 1. The intake duct 12 is attached to a discharge port of a blower fan 60 having an electric motor. The angle α at which the air intake duct 12 introduces air into the reflecting mirror 1 is as described above, and is in the range of 3 to 12 degrees (preferably 5 to 10 degrees) with respect to the optical axis C of the light-emitting lamp. It is comprised so that it may incline in.

  As the blower fan 60, a centrifugal blower {for example, a multi-blade (sirocco fan), radial, rearward blades, etc.}, an axial fan (vane, tube, propeller, etc.), a diagonal fan, or the like can be used. Further, the blower fan 60 may be configured to be arranged on the intake port 2a side of the reflecting mirror 1 so as to send out the wind as shown in the illustrated embodiment, or may be disposed on the exhaust port 2b side of the reflecting mirror 1. Of course, you may comprise so that a wind may be drawn in.

  An exhaust duct 13 is opposed to the exhaust port 2 b of the reflecting mirror 1. An exhaust-side tip of the exhaust duct 13 is opposed to an exhaust window 28 provided on the rear surface portion 21 d of the outer case 21. The exhaust window 28 may be formed by providing a large number of air holes in the rear surface portion 21d, or by providing a plurality of slit-shaped long holes, and as shown in FIG. 11, a large hole is formed in the rear surface portion 21d. A grid-like wire net 61 may be attached to the inner surface of the lever.

  Thus, when the light source device 22 is turned on to cause the metal halide lamp 5 that is a light-emitting lamp to emit light, the illumination light emitted from the metal halide lamp 5 passes through the lens array 52 and the polarization conversion element 51 and then the first dichroic. Of the illumination light, only the blue light (B) is reflected by the mirror 48, and the green light (G) and the red light (R) are transmitted. The reflected blue light is totally reflected by the first total reflection mirror 45 and irradiated to the first liquid crystal panel 36 through the first condenser lens 40. From the green light and red light that have passed through the first dichroic mirror 48, only the green light (G) is reflected by the second dichroic mirror 49, and the red light (R) is transmitted. The reflected green light is applied to the second liquid crystal panel 37 through the second condenser lens 41.

  The red light transmitted through the second dichroic mirror 49 is totally reflected by the third total reflection mirror 47 through the fifth condenser lens 44. Then, the light is totally reflected by the second total reflection mirror 46 through the fourth condenser lens 43, and further irradiated to the third liquid crystal panel 38 through the third condenser lens 42. The blue light transmitted through the first liquid crystal panel 36, the green light transmitted through the second liquid crystal panel 37, and the red light transmitted through the third liquid crystal panel 38 are combined by the cross dichroic prism 35. The light is emitted from the cross dichroic prism 35. The emitted light is projected on a screen (not shown) through the lens group 30 of the lens device 24.

  In this case, in the light source device 22 in the video projector 20, high heat is generated when the metal halide lamp 5, which is a light-emitting lamp, emits light. On the other hand, the discharge port of the intake duct 12 connected to the blower fan 60 is opposed to the intake port 2a of the reflecting mirror 1 in which the metal halide lamp 5 is housed, and the air introduction angle α of the intake duct 12 is determined by the metal halide. It is set within a range of 3 to 12 degrees (preferably 5 to 10 degrees) with respect to the optical axis C of the lamp 5.

  Therefore, as described above, the air flow (wind) discharged from the blower fan 60 smoothly enters the reflecting mirror 1 through the intake duct 12 and smoothly flows toward the metal halide lamp 5 to cool it. At the same time, air convection is generated in the reflecting mirror 1. As a result, the heat of the metal halide lamp 5 can be directly taken and cooled by the air introduced from the outside, and the air warmed by the taken heat can be convected to flow toward the exhaust port 2b. Then, the high-temperature air that has moved to the exhaust port 2 b side can be exhausted from the exhaust port 2 b as it is, and then discharged to the outside from the exhaust window 28 of the exterior case 21 through the exhaust duct 13.

  As a result, the metal halide lamp 5 can be efficiently cooled, and the lamp temperature can be controlled and maintained within a preset guaranteed temperature range (for example, 800 ° C. to 900 ° C.). Accordingly, in the present invention, since the cooling efficiency of the light emitting lamp can be increased, this corresponds to the fact that the blower fan can be reduced in size by the increase in efficiency, and a smaller blower fan can be used compared to the conventional one. . Assuming that the size of the blower fan is the same as that of the conventional fan, this corresponds to the fact that the wind speed can be lowered by the increase in efficiency. In such a case, noise generated by driving the blower fan Can be reduced.

  FIG. 12 shows a rear type video projector according to a second embodiment of the projection type display apparatus in which the light source device having the above configuration is used. The rear-type video projector 70 includes an image device unit 71 including an optical prism unit having the light source device, and a screen unit 72 that projects an image supplied from the image device unit 71 on a screen by reflecting the image on a screen. It is composed of This rear-type video projector 70 has a configuration in which a screen unit 72 is placed on a video device unit 71. An intake window 73 is provided on the front surface of the video device unit 71, and an exhaust window is not shown in the figure. Is provided. Other configurations are the same as those of the embodiment shown in FIG.

  By applying the light source device 22 to the rear type video projector 70 having such a configuration, the same effects as in the above-described embodiment can be obtained.

  As described above, according to the present invention, for example, in the light source device of a liquid crystal video projector, an optimal duct shape can be formed for cooling the light emitting lamp in the reflecting mirror, and the cooling performance of the light emitting lamp is improved. can do. Therefore, the size of the blower fan can be reduced by an amount corresponding to the improvement in the cooling performance, and if the same blower fan is used, the blower output can be suppressed by the amount corresponding to the improvement in performance. As a result, it is possible to reduce noise caused by the blower fan and contribute to cost reduction.

  Furthermore, since the size of the blower fan can be reduced, a usable space around the light source device can be widened, and the degree of freedom of other component arrangement can be increased. Even in the case where devices or devices installed around the light source device cause a temperature rise and this may affect the light source device, the present invention has a margin in the driving force of the blower fan. , Increase the output, increase the cooling capacity inside the reflector, and keep the temperature of the light-emitting lamp below the guaranteed temperature. Accordingly, various problems (lamp life, blackening phenomenon, whitening phenomenon, etc.) when the light emitting lamp is turned on can be improved in the present invention.

  In the above-described embodiment, an example in which a metal halide lamp is applied as a light-emitting lamp of a light source device has been described. However, the present invention is not limited to this example. Various lamps with brightness can be applied. In the above-described embodiment, an example in which the projection display device is applied to a video projector has been described. However, it is needless to say that the light source device can also be applied to other electronic devices such as a projector, a lighting device, and a searchlight. As described above, the present invention can be variously modified without departing from the scope of the invention.

It is the perspective view which looked at one Example of the reflective mirror which concerns on the light source device of this invention from the back side. FIG. 2 is an explanatory diagram showing a cross section in a vertical direction of the reflecting mirror and the front cover shown in FIG. 1. It is explanatory drawing which shows the state which inclined the introduction angle of the intake duct with respect to the reflective mirror which concerns on a light source device with respect to the lamp optical axis. It is explanatory drawing which shows the state which made the intake duct with respect to the reflective mirror which concerns on a light source device parallel to the lamp optical axis. It is explanatory drawing which shows an air volume and a wind direction when the introduction angle (alpha) of the intake duct with respect to the reflective mirror which concerns on a light source device is 0 degree. It is explanatory drawing which shows an air volume and a wind direction when the introduction angle (alpha) of the intake duct with respect to the reflective mirror which concerns on a light source device is 5 degree | times. It is explanatory drawing which shows an air volume and a wind direction when the inlet angle (alpha) of the intake duct with respect to the reflective mirror which concerns on a light source device is 10 degree | times. It is explanatory drawing which shows an air volume and a wind direction when the inlet angle (alpha) of the intake duct with respect to the reflective mirror which concerns on a light source device is 15 degree | times. It is explanatory drawing which shows an air volume and a wind direction when the inlet angle (alpha) of the intake duct with respect to the reflective mirror which concerns on a light source device is 40 degree | times. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a front type video projector showing a first embodiment of a projection display device using a light source device of the present invention. It is explanatory drawing which shows the outline of an internal structure of the front type video projector shown in FIG. It is a perspective view of the rear type video projector which shows the 2nd Example of the projection type display apparatus using the light source device of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Reflector, 1a ... Lamp holding part, 2a ... Intake port, 2b ... Exhaust port, 4 ... Front cover, 5 ... Metal halide lamp (light emitting lamp), 6a ... Light emitting part, 6b ... Rear side sealing part, 6c ... Front side sealing part, 12 ... Intake duct, 13 ... Exhaust duct, 20 ... Front type video projector (projection type display device), 21 ... Exterior case, 22 ... Light source device, 23 ... Optical prism unit, 24 ... Lens device, 27 ‥ inlet window, 28 ‥ exhaust windows, 60 ‥ blowing fan, 70 ‥ rear video projector (projection display device)

Claims (11)

A reflecting mirror having a substantially U-shaped longitudinal cross-section and provided with an intake port and an exhaust port on the side surface on the opening side;
A light emitting lamp attached to a central portion of the reflecting mirror;
An intake duct provided outside the intake port for guiding outside air into the reflector, and
The intake duct is provided with an introduction angle of the outside air inclined at a predetermined angle with respect to the optical axis of the light emitting lamp so as to guide the outside air to the light emitting lamp and to generate air convection inside the reflecting mirror. A light source device characterized by the above. A reflecting mirror having a substantially U-shaped longitudinal cross-section and provided with an intake port and an exhaust port on the side surface on the opening side;
A light emitting lamp attached to a central portion of the reflecting mirror;
An intake duct provided outside the intake port to guide outside air into the reflector;
Air blowing means for introducing outside air from the intake port into the reflector and exhausting it from the exhaust port, and
The intake duct is provided with an introduction angle of the outside air inclined at a predetermined angle with respect to the optical axis of the light emitting lamp so as to guide the outside air to the light emitting lamp and to generate air convection inside the reflecting mirror. A light source device characterized by the above.   The light source device according to claim 1 or 2, wherein an outside air introduction angle of the intake duct is in a range of 3 degrees to 12 degrees with respect to an optical axis of the light emitting lamp.   The light source device according to claim 1, wherein an end of the reflecting mirror on an opening side is closed by a transparent front cover.   The light source device according to claim 1, wherein the exhaust port is disposed at a position facing the intake port. An image display section for displaying an image;
A light source device for irradiating the image display unit with light;
In a projection type display device comprising: a lens device that magnifies and projects an image displayed on the image display unit by light from the light source device;
The light source device includes a reflecting mirror having a substantially U-shaped longitudinal cross-section and provided with an intake port and an exhaust port on a side surface on the opening side, a light-emitting lamp attached to a central portion of the reflecting mirror, and the reflection An intake duct provided outside the intake port for guiding outside air into the mirror,
The intake duct is provided with an introduction angle of the outside air inclined at a predetermined angle with respect to the optical axis of the light emitting lamp so as to guide the outside air to the light emitting lamp and to generate air convection inside the reflecting mirror. A projection display device characterized by the above.   The projection display device according to claim 6, wherein the light source device further includes a blowing unit that introduces outside air into the reflecting mirror through the intake port and exhausts the air from the exhaust port.   The projection display device according to claim 6, wherein an outside air introduction angle of the intake duct is in a range of 3 degrees to 12 degrees with respect to an optical axis of the light emitting lamp.   The projection display device according to claim 6, wherein an end of the reflecting mirror on an opening side is closed by a transparent front cover.   The projection display device according to claim 6, wherein the exhaust port is disposed at a position facing the intake port.   The projection display device according to claim 6, wherein the screen is installed outside or inside the housing in which the image display unit, the light source device, and the lens device are housed. .

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