JP3847320B1 - Light source device, lamp unit, and projection-type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts constituting a light source device and improve the cooling performance of the light source.
A light source device 30 is provided with an inner wall member 50 including a first inner wall 51, a second inner wall 52, a third inner wall, and the like inside a U-shaped casing 31, and one side wall around the periphery. The front wall 40, the other side wall 60, and the back wall 70, which are integrated with the front portion 42, are attached. The light source 21 is attached to the inner surface 41 c of the front wall 40, and the heat of the light source 21 is radiated through the front wall 40. A circulation fan 29 is attached to the rear part 34 forming one side wall of the casing 31, and air flows from the duct part 43 of the front part 42 into the reflector 22 of the light source 21 by the operation of the circulation fan 29, and the inside of the reflector 22. The air heated to a high temperature by cooling the luminous body 24 circulates around the casing 31 and is radiated from the other side wall 60 and the back wall 70.
[Selection] Figure 3

Description

The present invention is explosion-proof light source device with improved cooling efficiency as well as reduce the number of components, lamp unit, and a projection type image display device.

  2. Description of the Related Art Conventionally, there is a projector (projection type image display device) that projects modulated light on an image generated using a light source onto a screen and displays the image on the screen. Such a projection type image display apparatus is divided into a front projection system and a rear projection system typified by a rear projection television according to the modulation light projection system. The light source used in the projection type image display device is required to have high luminance for fine image display with excellent color reproducibility, and discharge type light emitters such as metal halide lamps and high pressure mercury lamps ( A lamp having a structure in which a lamp is attached to a concave reflector is often used.

  The illuminant of the light source contains an electrode in the tube and encloses mercury, halogen gas, etc., and the pressure inside the tube exceeds 150 atm when it is lit. Occurs, and the inclusions and the glass pieces of the tube are scattered. Therefore, there is an explosion-proof light source in which the opening side of the reflector is closed with a glass plate or an optical lens, etc., to prevent a plosive sound and leakage of inclusions.

  In general, the light source is often housed in a storage box so that the optical axis is in a specified direction, and unitized as a light source device. When the unitized light source device is mounted in the housing of the projection type image display device, the lamp housing is disposed in the case of the projection type image display device in order to position and fix the light source device at a predetermined location corresponding to the optical system. .

In addition, since the light source becomes hot during use and becomes hot (about 1000 ° C. in the chamber portion of the tube where the temperature is highest), there is a light source device that cools the light source by passing air through the light source device. (See Patent Documents 1 and 2 below). Furthermore, there is also a light source device in which the inside of the light source device is sealed to enhance explosion-proof performance and a fan that circulates the air inside the light source device is provided to cool the light source (see Patent Documents 3 and 4 below). ).
JP 2000-36214 A JP 2000-36215 A Japanese Utility Model Publication No. 2-113731 JP 2002-75014 A

  In the light source devices according to Patent Documents 1 and 2, since the inside of the light source device is communicated with the outside for cooling, there is a problem that the explosion-proof property is inferior to that of the light source device with the inside sealed. On the other hand, in the explosion-proof light source device according to Patent Documents 3 and 4 in which the inside is sealed, air is circulated for cooling, but the circulating air comes into contact with the light source that has become hot so that the temperature of the air itself Therefore, there is a problem that the cooling efficiency is lowered with the passage of time and sufficient cooling performance cannot be secured.

  In addition, since the light source reaches the product life with use for a certain period, it is necessary to replace it every certain period. However, in the light source device according to Patent Documents 1 to 4 described above, sufficient consideration is given to detachability for replacement. Therefore, there is a problem that the number of parts is large and it takes time to replace.

  Further, the luminous body of the light source has a problem that the temperature rise caused by the light emission differs for each part and the temperature distribution is biased, so that the load due to the temperature difference received by the tube forming the luminous body is large. For example, in the chamber part of the tube containing the electrodes, the top side (upper top part) becomes very hot, but the bottom side (lower top part) does not rise so much in temperature, so the temperature difference between the top side and the bottom side is large. Become. Also, in the longitudinal direction of the tube, a temperature difference occurs between one end attached to the reflector and the other end protruding from the reflector, and heat is released from the one end side of the tube to the reflector, so that the temperature is kept relatively low. However, since there is no heat conduction path on the other end side of the tube, heat is accumulated and the temperature rises. As described above, a temperature difference occurs in each portion of the luminous body tube, so that a load on the tube is increased.

The present invention has been made in view of the foregoing problems, and an object thereof is to provide explosion protection of the light source device with increased than the conventional cooling efficiency, lamp unit, and a projection type image display device.
It is another object of the present invention to provide a light source device that has an improved assemblability and maintainability by reducing the number of parts.
Furthermore, an object of the present invention is to provide a light source device that optimizes the direction of the airflow in the reflector so that the temperature distribution of the illuminant is not biased.

In order to solve the above problems, a light source device according to the present invention includes a light source in which a light emitter is attached to a concave reflector and a hexahedral storage box for storing the light source, and the storage box passes light emitted from the light source. A front wall detachable from the storage box with a hole to be formed, a side wall having a circulation fan for circulating the gas in the storage box attached to an outer surface, a back wall facing the front wall, and facing the one side wall The one side wall is divided into a front part connected to the front wall and a rear part connected to the back wall, and the circulation fan is disposed on an outer surface of the rear part. The front portion and the front wall are an integral member and can be removed from the storage box, and the front portion includes a duct portion connected to the discharge port of the circulation fan. Before The inner surface, Ri Oh attaching said light source detachable from said storage box together with the front wall, the front portion and the front wall, tear Rukoto formed of a material having a high thermal conductivity as compared with the rear portion It is characterized by.

  In the present invention, since the front wall and the front part are formed as an integral member, the number of parts constituting the light source device can be reduced as compared with the prior art. Also, the integrated front wall and front part can be removed from the storage box, and a duct part is provided in the front part and a light source is attached to the inner surface of the front wall, so that the duct part and the light source are also stored together with the front part and the front wall. It can be easily detached from the box, and the assembly and maintenance of the light source device are improved. Furthermore, since the light source is attached to the inner surface of the front wall, the reference surface to be attached can be clarified to reduce the accuracy error related to the optical axis of the light source, and the heat generated by the light source can be moved to the front wall. The heat dissipation of the light source can be improved. In order to improve heat dissipation, the reflector of the light source is made of a material having good thermal conductivity (for example, aluminum having higher thermal conductivity than iron), and the periphery of the reflector is brought into contact with the inner surface of the front wall. Is preferable.

The light source device according to the present invention is characterized in that the duct portion is formed integrally with the front portion, protrudes from an outer surface of the front portion, and includes a handle formed integrally with the front portion. And
In the present invention, since the duct portion and the handle are also formed integrally with the front portion, the number of parts can be further reduced, and the assemblability and the maintainability of the light source device can be improved.

In the present invention, the front part and the front wall, which are integral members, are formed of a material having a higher thermal conductivity than the rear part. Therefore, the heat inside the storage box due to the heat generated by the light source can be smoothly transferred to the front part and the front part. While it can move to the wall, a circulation fan is attached to the rear part where the thermal conductivity is lower than the front part and the front wall, so it is difficult for the circulation fan to transmit the heat generated inside the storage box, and the circulation fan A stable operating environment can be secured.

  In the light source device according to the present invention, the reflector has a ventilation portion communicating with the inside of the reflector, the duct portion includes a duct groove that guides gas to the ventilation portion, and the duct groove has a groove longitudinal direction. The cross section orthogonal to is U-shaped, and includes a top groove plate portion, a side groove wall portion, and a bottom groove plate portion, and the gas flowing into the reflector from the duct groove through the ventilation portion is directed upward in the reflector. Thus, the bottom groove plate portion is raised as it approaches the ventilation portion side.

  In the present invention, the bottom groove plate portion of the duct groove that guides the gas to the vent portion of the reflector is raised as it approaches the vent portion side, so that the gas flowing from the duct groove to the reflector rises. Proceed with As a result, the gas that has entered the reflector travels to the top side of the chamber portion of the illuminant, hardly flows to the bottom side, the top side of the chamber portion is intensively cooled, the temperature on the top side decreases, and the temperature originally increases. The temperature difference between the bottom side and the top side, which is difficult to rise, is reduced, and the burden due to the temperature difference on the tube forming the light emitter is eliminated.

The light source device according to the present invention is characterized in that a bottom-side built-up portion is formed at a corner portion in a groove where the bottom groove plate portion and the side groove wall portion are continuous.
In the present invention, since the bottom-side built-up portion is formed at the corner portion in the groove where the bottom groove plate portion and the side groove wall portion are continuous, the bottom-side built-up portion is formed at the corner portion having a large resistance to airflow. It becomes easy for gas to flow smoothly along. Therefore, the gas flowing through the duct groove can prevent the airflow from partially slowing down and smoothly guide the gas into the reflector.

The light source device according to the present invention is characterized in that a top-side built-up portion is formed at a corner portion in a groove where the top-groove plate portion and the side groove wall portion are continuous.
In the present invention, since the top-side built-up portion is formed in the corner portion in the groove where the top-groove plate portion and the side groove wall portion are continuous, the gas flowing through the top-side corner portion is It becomes easy to flow smoothly along the portion, and the gas in the duct groove can efficiently flow into the reflector through the ventilation portion.

The light source device according to the present invention is characterized in that external fins extending along a circumferential direction of the storage box are formed on the outer surface of the front wall.
In the present invention, since the external fin is formed on the outer surface of the front wall, the contact area with the outer atmosphere on the outer periphery of the storage box can be increased, and the heat dissipation can be further enhanced. In addition, since the external fin extends along the circumferential direction of the storage box, for example, even if suction is performed using the suction fan from the direction of the other side wall of the storage box, the flow of gas due to suction on the outer surface of the front wall is externally It does not need to be blocked by fins, and a good gas flow can be formed.

The light source device according to the present invention is characterized in that an inner fin is formed on the inner surface of the front wall.
In the present invention, since the internal fin is formed on the inner surface of the front wall, the contact area with the internal atmosphere of the storage box can be increased, and heat can be transferred from the internal atmosphere having increased temperature to the front wall through the internal fin. , Can contribute to lowering the temperature of the internal atmosphere.

The light source device according to the present invention is characterized in that the internal fin extends orthogonally to the external fin.
In the present invention, since the internal fins extend perpendicularly to the external fins, the internal fins extend in the vertical direction of the storage box. Inside the storage box, the inner surface of the front wall is exposed to a location that is not affected by the circulation fan, and in such a location, natural convection occurs due to the temperature of the gas present at that location. Since the direction of natural convection is from the bottom to the top, extending the internal fins to the top and bottom will not prevent natural convection, and the internal fins along the natural convection will take away the heat of the gas forming the natural convection. Can be moved to the front wall.

The light source device according to the present invention is characterized in that a duct fin is formed on a surface of the duct portion.
In the present invention, since the duct fin is formed on the surface of the duct part, the heat dissipation of the duct part can also be improved. In addition, the surface of the duct portion corresponds to either or both of the inner surface of the duct portion and the outer surface of the duct portion. When a duct fin is provided on the inner surface of the duct portion, contact with the gas flowing in the duct portion It is possible to increase the area and take heat from the gas with the duct fins. Moreover, when a duct fin is provided in the outer surface of a duct part, a contact area with the outer atmosphere of a duct part can be increased, and heat dissipation efficiency can be improved. Note that the duct fin provided on the inner surface of the duct portion is preferably extended along the flow in the duct portion so as not to disturb the gas flow, and the duct fin provided on the outer surface of the duct portion prevents natural convection. Therefore, it is preferable to extend along the direction of natural convection (the vertical direction of the storage box).

The light source device according to the present invention includes a light source in which a light emitter is attached to a concave reflector, and a hexahedral storage box for storing the light source, wherein the storage box is formed with a hole through which light emitted from the light source passes. A front wall removable from the box, a side wall having a circulation fan for circulating the gas in the storage box attached to the outer surface, a back wall removable from the storage box facing the front wall, and facing the one side wall In the light source device having the other side wall removable from the storage box, the one side wall is divided into a front part connected to the front wall and a rear part connected to the back wall. The circulation fan is attached to the outer surface, the front part and the front wall are an integral member and can be removed from the storage box, and the front part is connected to the outlet of the circulation fan. Comprising a duct portion to be continued, the inner surface of the front wall, Ri Oh attaching said light source detachable from said storage box together with the front wall, the front portion and the front wall has a thermal conductivity as compared with the rear portion rate is formed of a material having a high and said tare Rukoto.
In the present invention, since the other side wall and the back wall are removable from the storage box, when both walls are removed, the periphery of the storage box is opened, and the accessibility to the inside of the storage box can be improved. Assembly and maintenance can be further improved.

The light source device according to the present invention is characterized in that the other side wall and the back wall include an outer fin and an inner fin formed on an outer surface and an inner surface, respectively.
In the present invention, since the other side wall and the back wall are provided with the outer fin and the inner fin, the contact area with the outer atmosphere and the inner atmosphere can be increased also on the other side wall and the back wall of the storage box, and the gas in the storage box can be increased. Heat transfer to the other side wall and the back wall can be enhanced, and heat dissipation of the heat moved to the other side wall and the back wall can be enhanced outside the storage box.

  The light source device according to the present invention is characterized in that a plurality of the outer fins and the inner fins are formed at intervals, and the interval between the inner fins is narrower than the interval between the outer fins. To do.

  In the present invention, by providing a plurality of outer fins and inner fins, it is possible to further increase the amount of heat transfer from the gas inside the storage box and the heat radiation outside the storage box. Also, the interval between the inner fins is made narrower than the interval between the outer fins, so that more inner fins can be provided than the outer fins, and the gas is circulated by a circulation fan to cool the light source and to increase the temperature. Much heat can be taken away from the gas. Although the resistance to circulate the gas is increased by narrowing the interval between the inner fins, the inside of the storage box is a closed space, so that airflow noise leaks out of the storage box. Therefore, it is possible to circulate the gas using a circulation fan having a large horsepower.

  The light source device according to the present invention opposes the first inner wall facing the inner surface of the other side wall with a gap, the second inner wall facing the back wall with a gap, and the rear portion with a gap. The circulation fan includes a first space formed between the other side wall and the first inner wall, a second space formed between the back wall and the second inner wall, and the The gas that has sequentially passed through the third space formed between the rear portion and the third inner wall is sucked.

  In the present invention, the first inner wall, the second inner wall, and the third inner wall are provided, and the gas is caused to flow in order from the first space to the third space through the second space by the circulation fan. The gas travels in contact with the inner surfaces of the other side wall and the back wall and is sucked into the circulation fan. Since the other side wall and the back wall of the storage box have a lower temperature than the gas that has cooled the light source, the gas continuously contacts the inner surfaces of the other side wall and the back wall while passing through the first space and the second space. Thus, heat conduction that the heat of the gas moves to the other side wall and the back wall is continuously generated, and the heat can be efficiently taken from the gas. As a result, the high-temperature light source can be cooled again with the gas that has been deprived of heat and the temperature has decreased, and sufficient cooling performance can be maintained even in a light source device having a sealed storage box.

  The light source device according to the present invention opposes the first inner wall facing the inner surface of the other side wall with a gap, the second inner wall facing the back wall with a gap, and the rear portion with a gap. The circulation fan includes a first space formed between the other side wall and the first inner wall, a second space formed between the back wall and the second inner wall, and the Gas that sequentially passes through the third space formed between the rear portion and the third inner wall is sucked, and the other side wall and the back wall are formed on the outer fin and the inner surface formed on the outer surface and the inner surface, respectively. A fin is provided, and the second inner wall and / or the third inner wall includes a protrusion protruding so as to abut on a tip of the inner fin.

  In the present invention, since gas is sequentially passed through the first space, the second space, and the third space formed by the first inner wall, the second inner wall, and the third inner wall, the inner surfaces of the other side wall and the back wall Since the gas can be reliably contacted and the outer and inner fins are provided on the other side wall and the back wall, the heat of the gas can be taken away by the inner fin to dissipate the heat from the outer fin, and the temperature of the gas is lowered to reduce the temperature of the light source. Can be cooled stably. In addition, since the protrusion with which the tip of the inner fin abuts is provided on the second inner wall and / or the third inner wall, even if the other side wall and / or the back wall can be removed from the storage box, the frictional engagement is achieved by the abutment. It is possible to prevent the other side wall and / or the back wall from inadvertently falling out, and furthermore, heat conduction from the second inner wall and / or the third inner wall to the other side wall and / or the back wall also occurs through the abutting portion. It can contribute to the temperature reduction of the components in the box.

The light source device according to the present invention is characterized in that the first inner wall, the second inner wall, and the third inner wall are integral members and can be removed from the storage box.
In the present invention, since the first inner wall, the second inner wall, and the third inner wall are made integral and removable from the storage box, the number of parts constituting the light source device can be reduced, and The ease of assembly and maintenance in the storage box can be improved.

  In the present invention, a suction fan is provided opposite to the entrance / exit of the housing part, and a suction guide part extending outward from the peripheral edge of the entrance / exit is provided, so that the gas outside the entrance / exit is sucked when the suction fan is activated. It is guided by the guide part and can be drawn into the housing part from the entrance / exit, and a larger amount of gas flows from the entrance / exit to the suction fan in the housing part as compared with the conventional case. Therefore, a large amount of gas flows in the peripheral direction of the storage box of the light source device mounted on the housing portion, and the cooling performance of the storage box can be improved as compared with the conventional case. The suction guide portion also serves as a guide for guiding the light source device into the housing portion when the light source device is attached to the housing portion, so that the light source device can be easily attached.

A lamp unit according to the present invention includes any one of the light source devices described above and a housing portion to which the light source device is mounted, and the housing portion emits light from an entrance through which the light source device enters and exits and a light source device mounted inside. A lamp housing formed with a light passage opening through which light to pass is formed, and the lamp housing is attached to a location facing the entrance / exit of the housing portion so as to suck the gas inside the housing portion A fan and a suction guide part extending outward from a peripheral edge of the doorway are provided, and the light source device is mounted on a housing part of the lamp housing.
In the present invention, since the light source device that radiates heat from the periphery of the storage box is mounted on the housing portion of the lamp housing described above, heat transfer is performed by efficiently removing heat from the light source device and exhausting it outward from the housing portion. Thus, it is possible to realize a lamp unit that secures good cooling performance for a light source device that maintains an explosion-proof structure.

  The projection-type image display apparatus according to the present invention includes the lamp unit, a spatial light modulation element that generates modulated light according to an image using light emitted from a light source included in the lamp unit, and a modulation generated by the spatial light modulation element. A projection lens that projects light onto a projection object; and a housing that houses the lamp unit, the spatial light modulation element, and the projection lens, and the housing is an opening formed at a location facing an entrance / exit of the lamp housing It is characterized by having.

  In the present invention, the lamp unit having the above-described configuration is provided, and an opening is provided at a location of the housing facing the entrance / exit of the lamp housing. Therefore, when the suction fan of the lamp housing is operated, the gas outside the housing is discharged. It can be sucked into the housing part in the housing through the opening, and gas can flow continuously and stably around the light source device, and the explosion-proof light source device is excessive even if the projection type image display device is used for a long time It can prevent high temperature.

  In the present invention, since the front wall and the front part are integrated members, the number of parts constituting the light source device can be reduced, and the integrated front wall and front part can be detached from the storage box, Since the front part is provided with the duct part and the light source is attached to the inner surface of the front wall, the duct part and the light source can be easily detached from the storage box together with the front part and the front wall, and the assemblability and maintainability of the light source device can be improved.

In the present invention, the duct portion and the handle are also formed integrally with the front portion, so that the number of parts can be further reduced and the assemblability and the maintainability of the light source device can be improved.
In the present invention, the front part and the front wall, which are integral members, are formed of a material having a higher thermal conductivity than the rear part, so that the heat generated by the light source can be smoothly transferred to the front part and the front wall. Since the circulation fan is attached to the rear part having a lower thermal conductivity than the front part and the front wall, it is difficult to transfer heat to the circulation fan, and a stable operating environment of the circulation fan can be ensured.

In the present invention, the bottom groove plate portion of the duct groove that guides the gas to the vent portion of the reflector is raised as it approaches the vent portion side, so that the gas flowing into the reflector from the duct groove is raised. In this manner, the high temperature portion of the arc tube can be intensively cooled to eliminate a large temperature difference in the luminous body.
In the present invention, since the bottom-side built-up portion is formed at the corner portion in the groove where the bottom groove plate portion and the side groove wall portion are continuous, along the bottom-side built-up portion at the corner portion having a large resistance to airflow. A gas can flow smoothly and an airflow suitable for cooling can be formed.
In the present invention, since the top-side built-up portion is formed in the corner portion in the groove where the top-groove plate portion and the side groove wall portion are continuous, the gas flowing through the top-side corner portion is along the top-side built-up portion. It can flow smoothly and form an airflow suitable for cooling.

In the present invention, external fins extending along the circumferential direction of the storage box are formed on the outer surface of the front wall, so that the heat dissipation can be further enhanced by increasing the contact area with the outer atmosphere, Good heat dissipation can be secured by preventing the airflow flowing outside the front wall of the storage box from being disturbed by the external fins.
In the present invention, since the internal fin is formed on the inner surface of the front wall, the contact area with the internal atmosphere of the storage box can be increased, and heat can be transferred from the internal atmosphere having increased temperature to the front wall through the internal fin. , Can contribute to lowering the temperature of the internal atmosphere.

In the present invention, since the internal fins extend perpendicular to the external fins, the internal fins prevent the natural convection in the place where the circulation fan in the storage box is not affected by the internal fins. The heat can be taken away efficiently.
In the present invention, since the duct fin is formed on the surface of the duct portion, the heat dissipation of the duct portion can be improved.

In the present invention, since the other side wall and the back wall are removable from the storage box, when both walls are removed, the periphery of the storage box is opened, so that the accessibility to the storage box can be improved, and the light source device Assembling and maintenance can be further improved.
In the present invention, since the other side wall and the back wall are provided with the outer fin and the inner fin, the contact area with the outer atmosphere and the inner atmosphere can be increased also on the other side wall and the back wall of the storage box, and the gas in the storage box Heat transfer to the other side wall and the back wall can be enhanced, and heat dissipation of the heat moved to the other side wall and the back wall can be enhanced outside the storage box.

  In the present invention, by providing a plurality of outer fins and inner fins, the amount of heat transfer in the storage box and heat radiation to the outside of the storage box can be further increased, and the interval between the inner fins is By reducing the distance between the outer fins, the heat conduction efficiency can be improved with a large number of inner fins. On the other hand, since the number of outer fins is smaller than that of the inner fins, the generation of airflow noise outside the storage box can be suppressed. .

  In the present invention, the first inner wall, the second inner wall, and the third inner wall are provided, and the gas is caused to flow in order from the first space to the third space through the second space by the circulation fan. The gas travels in contact with the inner surfaces of the other side wall and the back wall, and the storage box can efficiently remove heat from the gas, and sufficient cooling performance is maintained even in a light source device having a sealed storage box. it can.

  In the present invention, since gas is sequentially passed through the first space, the second space, and the third space formed by the first inner wall, the second inner wall, and the third inner wall, the inner surfaces of the other side wall and the back wall Since the gas can be reliably contacted and the outer and inner fins are provided on the other side wall and the back wall, the heat of the gas can be taken away by the inner fin to dissipate the heat from the outer fin, and the temperature of the gas is lowered to reduce the temperature of the light source. Can be cooled stably. In addition, since the protrusion with which the tip of the inner fin abuts is provided on the second inner wall and / or the third inner wall, even if the other side wall and / or the back wall can be removed from the storage box, the frictional engagement is achieved by the abutment. It is possible to prevent a situation where the other side wall and / or the back wall is accidentally dropped.

  In the present invention, since the first inner wall, the second inner wall, and the third inner wall are made integral and removable from the storage box, the number of parts constituting the light source device can be reduced, and Assemblability and maintainability in the storage box can be improved.

In the present invention, the suction fan is provided opposite to the entrance / exit of the housing part, and the suction guide part extending outward from the peripheral edge of the entrance / exit is provided, so that a large amount of gas is guided into the housing part by the operation of the suction fan. The cooling performance of the light source device can be improved, and the mounting of the light source device can be guided by the suction guide portion.
In the present invention, since the light source device that radiates heat from the periphery of the storage box is mounted on the housing portion of the lamp housing described above, heat transfer is performed by efficiently removing heat from the light source device and exhausting it outward from the housing portion. Thus, it is possible to realize a lamp unit that secures good cooling performance for a light source device that maintains an explosion-proof structure.

  In the present invention, the lamp unit having the above-described configuration is provided, and an opening is provided at a location of the housing that faces the entrance / exit of the lamp housing. The light source device can be continuously cooled through the opening, the light source device can be continuously cooled, and the explosion-proof light source device can be prevented from becoming excessively hot even when the projection type image display device is used for a long time.

  FIG. 1A shows a rear projection apparatus 1 (projection type image display apparatus) according to an embodiment of the present invention. The rear projection device 1 of the present embodiment is characterized in that the number of parts related to the light source device housed therein is reduced and the cooling performance is improved.

  The rear projection apparatus 1 has a configuration in which a lower casing 2 and an upper casing 3 are combined in appearance, and the lower casing 2 includes an optical unit that performs a projection process of modulated light representing an image through a projection lens 12 therein. 10. A control unit 5 that performs overall control processing of the apparatus, a power supply unit 4 that supplies power to each unit, and the like are housed. The upper housing 3 has a reflection mirror 1a attached to the inner surface side of the back wall 3a and a screen 1b (corresponding to a projection object) attached to the front frame 3b. With the above configuration, in the rear projection apparatus 1, the modulated light representing the image projected from the projection lens 12 is reflected by the reflection mirror 1a to the screen 1b, and the image is displayed on the screen 1b.

  FIG. 1B shows a plan view of the optical unit 10 housed in the lower housing 2. In the optical unit 10, a lamp unit 20, an optical engine 13 including a spatial light modulator 14, and a substrate circuit unit 15 including a processing circuit for the optical engine 13 are mounted on a base plate 10 a. In the lamp unit 20, a light source device 30 including a light source 21 is mounted inside a lamp housing 80. In addition, the lamp unit 20 sucks air (gas) for cooling the light source device 30 through the intake duct 6 from the intake opening 2b of the back plate portion 2a of the lower housing 2 and air that has become hot due to cooling (air) Heat) is discharged to the outside through the exhaust duct 7 through the exhaust opening 2d of the oblique back plate portion 2c. The intake opening 2b of the lower housing 2 is provided so as to face the entrance / exit 81c (see FIG. 2) of the lamp housing 80 housed in the lower housing 2, so that air outside the apparatus can be smoothly passed through the entrance / exit 81c. It is made to flow toward.

  The optical engine 13 accommodates light-transmitting members of various optical systems that allow light from the light source 21 to pass and be reflected therein, and guides the light to the spatial light modulation element 14 through the passage and reflection of various light-transmitting members. Based on the control processing of the unit 15, the spatial light modulator 14 generates modulated light representing an image. Furthermore, the optical engine 13 has a projection lens 12 attached at a predetermined angle at a light exit location, and projects the generated modulated light from the projection lens 12.

  FIG. 2 shows a state in which the lamp housing 80 and the light source device 30 constituting the lamp unit 20 of the optical unit 10 are disassembled. The lamp housing 80 includes a box-shaped housing portion 81 in which the light source device 30 is mounted from an opened entrance 81 c and a suction fan 85 that sucks air (gas) inside the housing portion 81. The Z axis in the XYZ coordinates shown in FIG. 2 indicates a direction parallel to the optical axis of the light source device 30 (light source 21), the X axis is orthogonal to the Z axis, and the direction in which the light source device 30 is attached to the housing portion 81. The Y axis indicates a direction orthogonal to a plane (XZ plane) constituted by the X axis and the Z axis (hereinafter the same).

  The housing portion 81 basically has a structure covering the periphery other than the entrance / exit 81c, and forms a light passage port 81b for allowing the light emitted from the light source device 30 to pass through the wall portion 81a on the side joined to the optical unit 13. is doing. Further, the housing part 81 has a suction fan 85 attached to the outer surface of the peripheral wall part 81e facing the entrance / exit 81c, and a suction port 81f for the suction fan 85 is provided in the peripheral wall part 81e (see FIG. 14).

  Furthermore, the housing part 81 has female connectors 83 and 84 attached to the upper and lower peripheral parts of the entrance / exit 81c. The upper female connector 83 is a connector for supplying power to the light source 21, and the lower female connector 84 is a connector for supplying power to the circulation fan 29 attached to the light source device 30. , 84 are connected to a predetermined electric circuit included in the lower housing 2 although not shown.

  Furthermore, the housing part 81 has outwardly projecting suction guide parts 82a, 82b, 82c, and 82d on the periphery of the four sides excluding the place where the female connectors 83 and 84 of the entrance / exit 81c are attached. The suction guide portions 82a to 82d have inner surfaces that are inclined so as to spread outward in the surroundings. When the suction fan 85 of the housing portion 81 is operated, the air present in the outer periphery of the inlet / outlet port 81c is removed. In addition to being guided smoothly inside, it also serves as a guide when the light source device 30 is mounted on the lamp housing 80. As shown in FIG. 2, when the lamp housing 80 is fixed to the base plate 10a, the outer surface of the wall portion 81a of the housing portion 81 is joined to the end surface of the flange portion 13a formed at the end portion of the optical engine 13. At the same time, the central axis of the light passage port 81 b coincides with the optical center of the optical engine 13.

  On the other hand, as shown in FIGS. 2 to 4, the light source device 30 has a structure in which the light source 21 is housed in a hexahedral housing 31 (corresponding to a housing box), and the housing 31 passes light emitted from the light source 21. A front wall 40 having a hole 41b to be formed, a side wall 30a attached to the outer surface of a circulation fan 29 for circulating air (gas) in the housing 31, a back wall 70 facing the front wall 40, and a side wall 30a. The other side wall 60 is provided around the periphery. The casing 31 has one side wall 30a divided into two, the side connected to the front wall 40 in the circumferential direction is the front part 42, and the side connected to the back wall 70 is the rear part 34. A circulation fan 29 is attached to the outer surface 34a.

  Further, the housing 31 accommodates an inner wall member 50 facing the other side wall 60, the back wall 70, and the rear portion 34 inside, and air is circulated along the walls 60 and 70 by the guide of the inner wall member 50. Thus, heat is radiated from the walls 60 and 70 (see FIG. 4). Hereinafter, each part which comprises the light source device 30 is demonstrated sequentially.

  As shown in FIG. 3, the front wall 40 of the housing 31 is a substantially L-shaped member integrated with the front portion 42 in a plan view. In this embodiment, the front wall 40 is used to ensure good heat dissipation. The front portion 42 is integrally formed by casting (aluminum die-casting) using aluminum (ADC 12) having a higher thermal conductivity than iron as a material. Further, the front wall 40 has a plurality of external fins 44 integrally provided on the outer surface 41a of the plate-like wall plate portion 41, and the plurality of external fins 44 are in the X-axis direction (corresponding to the peripheral direction of the front wall 40). Extending along. On the other hand, the front part 42 is integrally provided with a duct part 43 connected to the outlet 29 a of the circulation fan 29, and duct fins 45 extending in the Y-axis direction are integrated with the duct part 43 on the outer surface of the duct part 43. Is formed. The front wall 40 and the front portion 42 can be detached from the housing 31 and are fixed to the housing 31 by screws.

  The front wall 40 has the light source 21 attached to the inner surface 41c. The light source 21 of the present embodiment has an explosion-proof specification. As shown in FIGS. 3, 4, and 10, a light emitter 24 is attached in a concave reflector 22, and a disk-shaped explosion-proof glass is formed in the opening 22 c on the reflection side of the reflector 22. 23 is attached. The reflector 22 is a cylinder in which the inner peripheral surface side having a required curvature is a reflection surface, vents 22a and 22b are formed at opposing locations in the outer peripheral portion, and the end of the light emitter 24 is attached to the top of the outer peripheral wall. A portion 22d is projected.

  A cylindrical member 22 d of the reflector 22 has a block member 25 attached to an end thereof, and the block member 25 has a power supply line d that is conductively connected to the light emitter 24. The power supply line d has a connector C1 attached to the end thereof, and extends outward through a notch 42f provided in the front portion 42 (see FIG. 2). The light emitter 24 having one end attached to the cylindrical portion 22d specifically corresponds to a metal halide lamp, a high-pressure mercury lamp, or the like, and is a chamber having a spherical diameter expanded in the center in the longitudinal direction (Z-axis direction). While having the part 26, the front and back of the chamber part 26 are made into the sealing parts 24a and 24b. The light source 21 having such a configuration is attached so that the peripheral edge on the opening side of the reflector 22 is in contact with the front wall 42.

  FIG. 5 is a perspective view from the inner surface 41 c side of the front wall 40, and the light source 21 is fixed to the inner surface 41 c by fixtures 26 and 27 that hold the upper and lower peripheries of the reflector 22. By attaching the light source 21 in this way, the heat of the reflector 22 can be conducted from the inner surface 41 c to the front wall 40, and the heat in the reflector 22 is also transmitted to the front wall 40, thereby improving the cooling performance of the light source 21. Contributing to

  FIG. 6 is a perspective view from the inner surface 41c side of the front wall 40 with the light source 21 removed, and the inner surface 41c is provided with wall portions 40b surrounding the reflector 22 of the light source 21 at four locations around the hole 41b. In addition, internal fins 40a extending in the Y-axis direction are erected outward from the four wall portions 40b. Further, in the vicinity of each wall portion 40b, a contact plate portion 40f for positioning the fixtures 26 and 27 and a screw hole portion 40e for fixing the fixtures 26 and 27 with screws are formed.

  Further, the upper and lower wall portions 40b on the right side in FIG. 6 are continuous with the air flow guide wall 40d extending in the vertical direction (Y-axis direction) on the right end side of the inner surface 41c, and are surrounded by the air flow guide wall 40d. Is an inflow portion 40c into which the air that has passed through the ventilation portion 22b (see FIG. 5) on the discharge side provided in the reflector 22 of the light source 21 flows.

  As shown in FIG. 4, the outer periphery of the reflector 22 of the light source 21 attached to the inner surface 41 c of the front wall 40 becomes a closed space H closed by the inner wall member 50, and the inside of the inner surface 41 c of the front wall 40. A portion where the fin 40a is formed appears in the closed space H. Further, in the closed space H, natural convection in which air rises from the bottom to the top is generated by the heat of the reflector 22, and the internal fin 40a extends in a direction along the natural convection (Y-axis direction), so that the natural convection is not disturbed. The contact area with the closed space H is increased by the internal fins 40 a so that the heat in the closed space H can be transferred to the front wall 40.

  As shown in FIGS. 5 and 6, the front portion 42 has an upper rectangular hole 42 c for attaching the connector C <b> 1 of the light source 21 on the upper side, and is provided at the end of the lead wire 29 b extending from the circulation fan 29 on the lower side. The lower rectangular hole 42d for attaching the fan connector C2 is provided. In addition, the front portion 42 has an opening 43 a of a duct portion 43 formed on the inner side on the inner surface side. The duct portion 43 is a duct that guides air to the ventilation portion 22 a on the suction side provided in the reflector 22 of the light source 21. A groove 46 is provided.

  As shown in FIGS. 7, 8, and 9A, 9B, and 9C, the duct groove 46 has a U-shaped cross section perpendicular to the groove longitudinal direction (X-axis direction) (FIG. 9 ( a) (see (b)), an upper ceiling groove plate portion 47, a side groove wall portion 49 on the side, and a bottom groove plate portion 48 on the lower side, and an end on the side connected to the ventilation portion 22a of the reflector 22 A groove frame portion 46c is formed in the groove. The upper ceiling groove plate portion 47 is formed in parallel with the X-axis direction as shown in FIG. 8, but the lower bottom groove plate portion 48 has a parallel portion 48 a parallel to the X-axis direction, As it approaches the end where the groove frame portion 46c is provided (in the state where the light source 21 is attached, it is provided with an inclined portion 48b which is inclined upward and inclined).

  Thus, since the bottom groove plate portion 48 includes the inclined portion 48b, the air passing through the duct groove 46 is obliquely upward, and the gas that has entered the reflector 22 from the ventilation portion 22a is directed upward in the reflector 22. (The direction indicated by the arrow in FIG. 8). As a result, in the light source 21 shown in FIG. 10, a large amount of air flows into the top portion 26a of the chamber portion 26 of the light emitter 24 that becomes particularly high in the reflector 22, and the top portion 26a is efficiently cooled. On the other hand, since almost no air that has passed through the ventilation portion 22a flows downward in the reflector 22, the bottom portion 26b of the chamber portion 26 that is not as hot as the top portion 26a is not cooled much. Therefore, the cooled top portion 26a and the bottom portion 26b which is difficult to cool have a smaller temperature difference than the conventional one, and the thermal load on the glass tube forming the light emitter 24 can be reduced.

  Moreover, the duct groove | channel 46 forms the top side built-up part 46a in the corner | angular part 49a in the groove | channel where the top groove plate part 47 and the side groove wall part 49 continue (refer FIG. 7, FIG. 9 (a) etc.). The top-side built-up portion 46a is built up so as to fill the corner portion 49a, and the width increases as it approaches the end where the groove frame portion 46c is provided. Further, the duct groove 46 also forms a bottom-side built-up portion 46d at a corner portion 49b in the groove where the bottom groove plate portion 48 and the side groove wall portion 49 are continuous (see FIGS. 6 and 9A). . Similarly to the top-side built-up portion 46a, the bottom-side built-up portion 46d also becomes wider as it approaches the end where the groove frame portion 46c is provided. The top-side built-up portion 46a and the bottom-side built-up portion 46d are formed with delicate curved surfaces on the respective surfaces so that the air passing through the corner portions 49a, 49b of the duct groove 46 flows smoothly. At the same time, the air flow is directed to the top portion 26a of the chamber portion 26 that is heated by the light emitter 24 in the reflector 22 and the tip portion 24c of the protruding-side sealing portion 24a (see FIG. 10).

  Furthermore, the duct groove 46 forms a lip portion 46b that is inclined so as to move away from the side groove wall portion 49 as it approaches the end side where the groove frame portion 46c of the side groove wall portion 49 is provided (FIGS. 7 and 9). c)). The lip portion 46b causes the air flowing along the side groove wall portion 49 to travel toward the chamber portion 26 of the light emitter 24 by the lip portion 46b as shown in FIG. So that it can be cooled efficiently. In addition, all the parts provided in the front wall 40 and the front part 42 which were mentioned above are integrally formed, and the number of parts which comprise the light source device 30 is thereby aimed at reduction. Moreover, the material of the front wall 40 and the front part 42 is applicable if it is a material whose heat conductivity is higher than iron, for example, you may integrally form by casting using magnesium as a material.

  The casing 31 to which the front wall 40 and the front portion 42 are attached is a top plate portion 32, a rear portion 34 forming a part of one side wall 30a (see FIG. 2), and a bottom plate portion 33 as shown in FIG. Are integrally formed, and when viewed from the Z-axis direction, it is U-shaped. The casing 31 is made of iron, which has a lower thermal conductivity than aluminum, and the heat generated by the light source 21 is not easily transmitted to the casing 31 so that the circulation fan attached to the rear portion 34 is used. 29 is not affected by heat.

  The top plate portion 32 and the bottom plate portion 33 are formed substantially symmetrically in the vertical direction, and the front wall screw hole portion 31a is provided in the edge portion on the side where the front wall 40 is attached, and the edge portion on the side where the other side wall 60 is attached. Is provided with side wall screw holes 31b, notched grooves 35 and 36 are formed on the edge portion on the side where the back wall 70 is attached, and convex portions 38 and 39 for positioning and fixing the inner wall member 50 on the inner surface side. Is protruding.

  In addition, the rear portion 34 on the side of the housing 31 is provided with a protruding piece 37 that protrudes forward from the vicinity of the outlet 29 a of the circulation fan 29 attached to the outer surface 34. The projecting piece 37 has a root portion 37a and a tip portion 37b having a bent tip. The root portion 37a blocks the opening 43a of the guide portion 43 shown in FIGS. A path is formed (see FIG. 4), and the distal end portion 37b blocks the duct groove 46 to form an air path in the duct groove 46 (see FIGS. 4, 9A to 9C). Further, as shown in FIG. 11, the rear portion 34 has an air inlet 34c for the circulation fan 29 formed on the inner surface 34b, and engaging portions 34d and 34e for engaging and fixing the inner wall member 50. ing.

  On the other hand, the inner wall member 50 shown in FIG. 3 includes the first inner wall 51 and the wall portion 71 of the back wall 70 that face the inner surface 61b of the wall portion 61 of the other side wall 60 with a gap in the assembled state of the housing 31. The second inner wall 52 that faces the inner surface 71b with a space, the third inner wall 53 that faces the inner surface 34b of the rear portion 34 with a space, and the bent wall portion 54 in which the end of the third inner wall 53 is bent. (See FIG. 4).

  The first inner wall 51 projects a closing plate portion 51c near the center of the front end portion, and this closing plate portion 51c is provided on the inner surface 41c of the front wall 40 shown in FIGS. The opening range on the reflector 22 side of the inflow portion 40c is closed to form a path for the air exiting from the ventilation portion 22b of the reflector 22. In addition, the 1st inner wall 51 forms the bending board parts 55 and 56 in the upper-lower end part, and each bending board part 55 and 56 provides the hole 55a, 55b, 56a, 56b.

  In addition, the second inner wall of the inner wall member 50 is provided with four protrusions 57 protruding outward. The height at which the protrusion 57 protrudes from the second inner wall is set so as to come into contact with the tip 73a of the inner fan 73 of the back wall 70 in the assembled state of the casing 31 (FIGS. 4 and 12). b) (see c)). Further, the bent wall portion 54 of the inner wall member 50 forms a bent portion 58 at the end, and this bent portion 58 is inserted into the engaging portions 34 d and 34 e provided in the rear portion 34 of the housing 31. The engaging pieces 58a and 58b to be engaged are projected (see FIGS. 3 and 11).

  The other side wall 60 shown in FIG. 3 has a plurality of outer fins 62 protruding from the outer surface 61a of the wall portion 61 of the plate-like member, and a plurality of inner fins 63 protruding from the inner surface 61b. Both the fins 62 and 63 extend in the circumferential direction (Z-axis direction) at the location where the other side wall 60 of the casing 31 is attached, and the interval P2 between the inner fins 63 is as shown in FIG. It is narrower than the interval P1 between 62 (P2 is about half the size of P1).

  Further, among the plurality of inner fins 63, the one located in the vicinity of the center 63a in the height direction (Y-axis direction) has an end portion extending forward. In this way, the air that has passed through the reflector 22 and exited from the discharge-side passage portion 22b has an end portion in the inflow portion 40c that spreads up and down in the Y-axis direction of the front wall 40 shown in FIGS. Under the influence of the extended inner fin 63, the passage resistance near the center 63a in the height direction is increased to facilitate the flow of air in the vertical direction, and the air that has passed through the narrow passage portion 22b is diffused up and down uniformly. The other side wall 60 having the outer fin 62 and the inner fin 63 is integrally formed of aluminum in order to improve heat dissipation.

  The back wall 70 is basically the same structure and material as the other side wall 60, and a plurality of outer fins 72 project from the outer surface 71 a of the wall portion 71 and a plurality of inner fins 73 project from the inner surface 71 b. ing. In addition, as for the pitch dimension of both fins 72 and 73, as in the other side wall 60, the interval between the inner fins 73 is narrower than the interval between the outer fins 72. Further, the back wall 70 is attached to the housing 31 by engagement, and two engagement protrusions 74 and 75 are provided on the upper side 71c and the lower side 71d of the wall 71, respectively. Yes.

Next, a procedure for assembling the light source device 30 by assembling the light source 21 and the front wall 40, the inner wall member 50, the other side wall 60, and the back wall 70 constituting the housing 31 will be described.
First, as shown in FIGS. 3 and 11, the inner wall member 50 is inserted into the housing 31 to be engaged and fixed. At this time, the engagement pieces 58a and 58b provided in the bent portion 58 of the inner wall member 50 are inserted and engaged with the engagement portions 34d and 34e provided in the rear portion 34 of the housing 31, and the first inner wall is engaged. The upper and lower convex portions 38 and 39 of the casing 31 are inserted into the holes 55 a, 55 b, 56 a and 56 b of the bent plate sections 55 and 56, respectively, and the inner wall member 50 is fixed in the casing 31. As described above, since no screws are used to fix the inner wall member 50, the inner wall member 50 can be attached to the housing 31 with one touch.

  After the inner wall member 50 is attached, the light source 21 is attached to the inner surface 41 c of the front wall 40 as shown in FIG. 5, and the integrated front wall 40 and front portion 42 are attached to the front end and one side of the housing 31. It is fixed to the front by screwing (see FIG. 3).

  Then, as shown in FIGS. 12 (a) to 12 (c), the engagement protrusion 74 (75) of the back wall 74 is fitted into the notch groove 35 (36) of the housing 31, and the groove depth portion of the notch groove 35. After being positioned at 35b, it is advanced in the direction of the arrow in FIG. 12 (b) and engaged with the groove tip 35b (see FIG. 12 (c)). In this state, the tip end portion 73 a of the inner fin 73 protruding from the back wall 74 abuts on the protrusion 57 provided on the second inner wall 52 of the inner wall member 50, so that the back wall 74 can easily fall out of the housing 31. There is no.

  Finally, the other side wall 60 is screwed and fixed to the housing 31, the end surface of the back wall 74 is suppressed at the back side end of the other side wall 60 (see FIG. 4), and the connector C1 of the light source 21 is connected to the upper rectangle of the front portion 42. The light source device 30 is completed by fitting into the hole 42c and fitting the fan connector C2 of the circulation fan 29 into the lower rectangular hole 42d.

  As shown in FIG. 4, in the completed light source device 30, a first space 30 b is formed between the other side wall 60 and the first inner wall 51, and a second space is formed between the back wall 70 and the second inner wall 52. A space 30 c is formed, and a third space 30 d is formed between the rear portion 34 and the third inner wall 53. Therefore, when the circulation fan 29 is activated, the air discharged from the circulation fan 29 enters the reflector 22 of the light source 21 from the duct groove 46 of the duct portion 43, and cools the light emitter 24 inside the reflector 22 to a high temperature. The air thus formed exits the reflector 22, passes through the first space 30 b, the second space 30 c, and the third space 30 d, and is sucked by the circulation fan 29 and circulates in the housing 31.

  At this time, when the high temperature air passes through the first space 30b and the second space 30c, it contacts the plurality of inner fins 63, 73 over a wide area, so that the heat of the air passes through the inner fins 63, 73. It moves to the side wall 63 and the back wall 70, and the light source 21 can be cooled many times with the air whose temperature has been lowered. Since the air flowing into the reflector 22 flows to the top portion 26a of the chamber portion 26 of the light emitter 24 and the tip of the seal portion 24a by the duct groove 46 described above, the location where the light emitter 24 is to be cooled is concentrated. It is cooling.

  Further, the heat of the light source 21 itself also moves to the front wall 40 that is in contact therewith, and the heat that has moved to the front wall 40 dissipates outward from the external fins 44 to increase the cooling efficiency of the light source 21. The heat transmitted to the duct portion 43 is also radiated to the outside through the duct fin 45.

  On the other hand, the completed light source device 30 is mounted on the housing portion 81 of the lamp housing 80 as shown in FIG. 2, and the connector C1 of the light source device and the fan connector C2 are connected to the female connectors 83 and 84 provided on the housing portion 81. The lamp unit 20 is completed by joining. When mounting the light source device 30, the light source device 30 is guided to the entrance / exit 81c by the suction guide portions 82a, 82b, 82c, 82d provided at the periphery of the entrance / exit 81c of the housing portion 81, so that the installation can be performed smoothly. .

  Further, the completed lamp unit 20 is assembled in the optical unit 10 and then stored in the lower housing 2 shown in FIGS. When housed in the lower housing 2, the suction guide portions 82a, 82b, 82c, and 82d of the lamp housing 80 are joined to the intake duct 6 provided in the lower housing 2, as shown in FIG. The exhaust duct 7 of the lower housing 2 is joined to the discharge part 81g of the housing 80, and the attachment of the lamp unit 20 to the rear projection device 1 is completed.

  When the suction fan 85 attached to the lamp housing 80 is operated, air outside the apparatus is taken in from the intake opening 2 b of the lower housing 2 and flows into the housing portion 81 through the intake duct 6. At this time, since air flows through the gap between the housing portion 81 and the light source device 31, the air comes into contact with the external fins 44 and the outer fins 62 and 72 of the light source device 31 protruding in the gap over a wide area. Further, since the heat inside the light source device 31 is transferred to the external fins 44 and the external fins 62 and 72, the external fins 44 and the external fins 62 and 72 are in contact with the flowing air over a wide area, and the external fins 44 are. , And the heat of the outer fins 62 and 72 is efficiently taken away by the air.

  Since the outer fins 62 and 72 have a wider fin interval than the inner fins 63 and 73 (see FIG. 13), the suction resistance is small and the generation of sound due to suction is minimized. On the other hand, the inner fins 63 and 73 have a structure in which the light source device 30 is hermetically sealed even if the fin interval is narrowed. ing.

  Further, since the high-temperature air sucked by the suction fan 85 is discharged outward from the exhaust opening 2d of the lower housing 2 through the exhaust duct 7 from the discharge portion 81g, the light source device 30 is continuously operated by the operation of the suction fan 85. Can be cooled.

  The present invention is not limited to the above-described embodiment, and various modifications can be applied. For example, when the light source device 30 is replaced, a handle may be provided on one side wall 30a of the light source device 30 so that the light source device 30 can be easily taken out from the lamp housing 80. In this case, as shown in FIG. It is preferable to form a handle 49 ′ integrally with the outer surface 42 a ′ of the front part 42 ′ so that the number of parts does not increase. Further, in order to further reduce the number of parts, the front wall 40 and the other side wall 60 may be integrally formed. On the other hand, when it is difficult to cast the duct portion 43 and the duct fin 45 etc. of the front wall 40 by casting, the duct portion 43 and the duct fin 45 etc. can be made as separate members. It is.

Furthermore, as shown in FIG. 16 (a), in order to improve the heat dissipation in the duct portion 43 ', a duct fin 45' may be provided inside the duct portion 43 'along the airflow direction.
Furthermore, as shown in FIG. 16 (b), in order to further increase the contact with air and improve the thermal conductivity, a duct fin 90 having a cross section formed in a honeycomb shape (corrugated shape) may be used. The shape of the duct fin 90 is applicable to the other fins 44, 62, 63, 72, 73, and the like.

  Furthermore, the other side wall 60 may be attached to the housing 31 in the same form as the back wall 70 as shown in FIGS. 12A and 12B. In this case, the first inner wall 51 may be provided with a projection 57 similar to the second inner wall 52 so as to contact the tip of the inner fin 63 of the other side wall 60. Further, the configuration in which the other side wall 60 and the back wall 70 are attached to the housing 31 may be reversed to the content shown in FIG. 3, and the other side wall 60 may be attached by engagement and the back wall 70 may be screwed. The protrusion 57 of the second inner wall 52 can be omitted. Further, the configuration according to the present invention can be applied to a front projection type projection image display apparatus in addition to the rear projection type rear projection apparatus 1 shown in FIGS.

(A) is sectional drawing of the rear projection apparatus which concerns on embodiment of this invention, (b) is sectional drawing in the AA of (a). It is a disassembled perspective view of an optical unit. It is a disassembled perspective view of a light source device. It is sectional drawing of the light source device in the BB line of FIG. It is a perspective view from the inner surface side of the front wall of the state which attached the light source. It is a perspective view from the inner surface side of the front wall of the state which removed the light source. It is an expansion perspective view which shows the detail of a duct groove | channel. It is the schematic of a duct groove | channel. (A) is sectional drawing in the EE line | wire of FIG. 8, (b) is sectional drawing in the FF line | wire of FIG. 8, (c) is sectional drawing in the GG line | wire of FIG. It is sectional drawing of a light source. It is a perspective view which shows the state which attaches an inner wall member to a housing | casing. (A)-(c) is the schematic which shows the procedure which attaches a back wall to a housing | casing. It is principal part sectional drawing of the other side wall in the DD line of FIG. It is sectional drawing of the lamp unit in the CC line of FIG. It is a perspective view which shows the front wall and front part of a modification. (A) is a perspective view of the duct part of a modification, (b) is the schematic of the duct part of another modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear projection apparatus 10 Optical unit 20 Lamp unit 21 Light source 22 Reflector 22a, 22b Ventilation part 24 Luminescent body 29 Circulating fan 30 Light source device 31 Housing | casing 34 Back part 40 Front wall 42 Front part 43 Duct part 44 External fin 45 Duct fin 50 Inner wall member 51 First inner wall 52 Second inner wall 53 Third inner wall 60 Other side walls 62, 72 Outer fins 63, 73 Inner fin 70 Back wall 80 Lamp housing 82a to 82d Suction guide portion

Claims (17)

A light source having a light emitter attached to a concave reflector, and a hexahedral storage box for storing the light source, the storage box having a front wall removable from the storage box having a hole through which light emitted by the light source passes. In the light source device having one side wall attached to the outer surface of the circulation fan for circulating the gas in the storage box, the back wall facing the front wall, and the other side wall facing the one side wall in the periphery,
The one side wall is divided into a front part connected to the front wall and a rear part connected to the back wall,
The circulation fan is attached to the outer surface of the rear part,
The front part and the front wall are an integral member and can be removed from the storage box,
The front portion includes a duct portion connected to an outlet of the circulation fan,
The inner surface of the front wall, Ri Oh attaching said light source detachable from said storage box with front wall,
The light source device, wherein the front part and the front wall are made of a material having higher thermal conductivity than the rear part . The duct part is formed integrally with the front part,
The light source device according to claim 1, further comprising a handle that protrudes from an outer surface of the front portion and is formed integrally with the front portion. The reflector is formed with a ventilation portion communicating with the reflector,
The duct portion includes a duct groove that guides gas to the ventilation portion,
The duct groove has a U-shaped cross section orthogonal to the groove longitudinal direction, and includes a top groove plate portion, a side groove wall portion, and a bottom groove plate portion,
3. The light source device according to claim 1, wherein the bottom groove plate portion is raised as it approaches the ventilation portion side so that gas flowing into the reflector from the duct groove through the ventilation portion is directed upward in the reflector. . The light source device according to claim 3 , wherein a bottom-side built-up portion is formed at a corner portion in a groove where the bottom groove plate portion and the side groove wall portion are continuous. Wherein the corner portion of the top groove plate and the groove wall portion is continuous in the groove, the light source apparatus according to claim 3 or claim 4 top side cladding portion is are formed. The front on the wall of the outer surface, the light source device according to any one of claims 1 to 5 external fins are formed extending along the circumferential direction of the storage box. The front on the inner surface of the wall, the light source device according to any one of claims 1 to 6 internal fins is formed. The light source device according to claim 7 , wherein the inner fin extends orthogonally to the outer fin. The light source device according to any one of claims 1 to 8 , wherein a duct fin is formed on a surface of the duct portion. A light source having a light emitter attached to a concave reflector, and a hexahedral storage box for storing the light source, the storage box having a front wall removable from the storage box having a hole through which light emitted by the light source passes. , A side wall having a circulation fan for circulating the gas in the storage box attached to the outer surface, a back wall detachable from the storage box facing the front wall, and removable from the storage box facing the one side wall In the light source device having the other side wall in the periphery,
The one side wall is divided into a front part connected to the front wall and a rear part connected to the back wall,
The circulation fan is attached to the outer surface of the rear part,
The front part and the front wall are an integral member and can be removed from the storage box,
The front portion includes a duct portion connected to an outlet of the circulation fan,
The inner surface of the front wall, Ri Oh attaching said light source detachable from said storage box with front wall,
The light source device, wherein the front part and the front wall are made of a material having higher thermal conductivity than the rear part . The light source device according to any one of claims 1 to 10 , wherein the other side wall and the back wall include an outer fin and an inner fin formed on an outer surface and an inner surface, respectively. A plurality of outer fins and inner fins are formed at intervals, respectively.
The light source device according to claim 11 , wherein an interval between the inner fins is narrower than an interval between the outer fins. A first inner wall facing the inner surface of the other side wall at an interval;
A second inner wall facing the back wall at an interval;
A third inner wall facing the rear portion at an interval,
The circulation fan includes a first space formed between the other side wall and the first inner wall, a second space formed between the back wall and the second inner wall, and a rear portion and a third inner wall. The light source device according to any one of claims 1 to 12 , wherein a gas that sequentially passes through a third space formed therebetween is sucked. A first inner wall facing the inner surface of the other side wall at an interval;
A second inner wall facing the back wall at an interval;
A third inner wall facing the rear portion at an interval,
The circulation fan includes a first space formed between the other side wall and the first inner wall, a second space formed between the back wall and the second inner wall, and a rear portion and a third inner wall. The gas that has sequentially passed through the third space formed between them is sucked,
The other side wall and the back wall include an outer fin and an inner fin formed on the outer surface and the inner surface, respectively.
It said second inner wall and / or the third interior wall, a light source device according to any one of claims 1 to 10 comprising a protruding projection so as to contact the distal end of the inner fins. The light source device according to claim 13 or 14 , wherein the first inner wall, the second inner wall, and the third inner wall are integral members and can be removed from the storage box. A light source device according to any one of claims 1 to 15 ,
A housing portion to which the light source device is mounted is provided, and the housing portion includes an inlet / outlet through which the light source device enters and exits, and a lamp housing in which a light passage port through which light emitted from the light source device mounted therein passes is formed. ,
The lamp housing is
A suction fan attached to a location facing the doorway of the housing portion so as to suck the gas inside the housing portion;
A suction guide portion extending outward from the periphery of the entrance and exit,
The lamp unit, wherein the light source device is mounted on a housing portion of the lamp housing. The lamp unit according to claim 16 ,
A spatial light modulation element that generates modulated light according to an image with light emitted from a light source included in the lamp unit;
A projection lens that projects the modulated light generated by the spatial light modulation element onto the projection target;
A housing for housing the lamp unit, a spatial light modulation element, and a projection lens;
The projection-type image display device, wherein the casing has an opening formed at a location facing an entrance / exit of the lamp housing.

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