JP5311838B2 - Video display device - Google Patents

Description

  The present invention relates to a video display device.

  A light source used in a video display device emits light by converting electric power input to the light source into light energy. At the same time, most of the input power is consumed as heat.

  The heat generated in this way has an adverse effect on the light source and members around the light source. For example, the generated heat increases the temperature of the light source itself, thereby reducing the brightness of the light source. In addition, the temperature of the member constituting the light source and the members around the light source is increased, and the durability of the member is impaired due to the deterioration of the material accompanying the temperature increase. For this reason, there has been a need to cool the heat generated from the light source so as to reach an appropriate temperature.

  In a conventional video display device, a heat dissipating fin attached to the rear surface of the light source is arranged so as to protrude outside the optical engine, and air in the vicinity of the heat dissipating fin is caused to flow by a blower to cool the light source. (For example, refer to Patent Document 1).

  Alternatively, in another conventional video display device, a heat receiving plate attached to the back of the light source is thermally connected to one end of the heat pipe, and a heat radiating plate is thermally connected to the other end of the heat pipe. Then, the heat generated from the light source is moved from the heat receiving plate to the heat radiating plate to cool the light source (see, for example, Patent Document 2).

JP 2005-74076 A Japanese Patent No. 3787954

  In these video display devices, in order to improve the brightness of the light source, when more power is applied, the heat that increases with the applied power is efficiently and inexpensively cooled. There is a problem that cannot be done.

  That is, in the prior art described in Patent Document 1, there is a need to increase the area of the radiating fin as the amount of heat generated increases. And since the ratio which contributes to cooling reduces, so that the distance from a heat source leaves | separates, the area of a radiation fin needs to be increased more than the increase rate of the emitted-heat amount. As a result, problems such as a decrease in cooling efficiency, an increase in the size of the apparatus, and an increase in material costs occur.

  Moreover, in the prior art described in patent document 2, since heat is moved through a heat pipe, it is necessary to increase the number of heat pipes as the amount of heat generated increases. In addition, the heat conductivity of the heat pipe itself changes depending on the orientation of the heat receiving part and the heat radiating part of the heat pipe, and the cooling efficiency varies. As a result, problems such as a decrease in cooling efficiency, an increase in size of the apparatus, and an increase in material costs and manufacturing costs arise.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a small and inexpensive video display device excellent in cooling efficiency.

The subject of this invention is provided with the light source provided with the light emitting element which light-emits visible light, the heat radiator provided with the radiation fin, and the air blower for making air flow, The said light source is thermally supplied to the said heat radiator. Connected, and the air blower is an image display device arranged so that air flows with respect to the heat radiating fins of the radiator, wherein the light source is attached to one surface of the radiator, The radiator includes the radiation fins on both the back surface and the surface of the surface to which the light source is attached, and the blower device is opposed to the back surface of the surface to which the light source of the radiator is attached. Arranged and air taken into the video display device from the blower device by the radiator and the first housing that houses the light source, the radiator and the blower device, the light source of the radiator Surface mounted A first flow path that passes through the heat dissipating fins on the back surface is formed, and the air after passing through the heat dissipating fins is formed by the heat radiator and the second housing accommodated in the first housing. A second flow path that extends from the radiation fin side to the light emitting element side of the light source and passes through the light emitting element side is formed, and further includes an optical system for displaying an image and an optical engine equipped with a display device. The second casing is a casing of the optical engine, the radiator and the casing of the optical engine are thermally connected, and the casing of the optical engine is The radiator has a side wall facing the surface on which the light source is mounted, and the radiator and the light source are disposed between the side wall of the optical engine casing and the side wall of the first casing, The heat sink and the side wall of the first housing A flow path formation, characterized Rukoto provided As the second flow path is formed by said optical engine housing side walls and the radiator the light source and the mounting surface of the.

According to the subject of the present invention, the heat radiation fin side of the radiator and the light emitting element side of the light source can be cooled, respectively, so that temperature rise due to heat generation from the light source and therefore the light emitting element can be suppressed. As a result, the brightness of the light source can be improved by applying more power to the light source. And since the temperature rise of the member which comprises a light source and the member around a light source is suppressed and deterioration of the material accompanying a temperature rise can be reduced, durability of a member can be improved. Furthermore, since the air volume required for the blower can be reduced by improving the cooling efficiency, the noise generated by the blower can be reduced.
Moreover, since the heat radiation area of the heat radiating fins of the radiator can be increased and the cooling capacity is further improved, the size of the radiator can be reduced accordingly. In addition, the temperature rise due to heat generation from the light source, and hence the light emitting element, can be further suppressed. As a result, it is possible to further increase the brightness of the light source by supplying more power to the light source. Moreover, the temperature rise of the member which comprises a light source, and the member around a light source is suppressed more, As a result of reducing the deterioration of the material accompanying a temperature rise, the durability of a member can be improved more. Furthermore, since the air volume required for the blower can be further reduced as the cooling efficiency is improved, the noise generated by the blower can be further reduced.

  Hereinafter, various embodiments of the subject of the present invention will be described in detail along with the effects and advantages thereof with reference to the accompanying drawings.

Embodiments 1 and 2 and reference embodiment 1 of the present invention will be described below based on the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and repeated description of the parts will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic perspective view partially showing the internal structure of the video display apparatus according to the present embodiment. FIG. 2 is a schematic perspective view showing the flow of air in the video display apparatus shown in FIG. FIG. 3 is a schematic perspective view schematically showing the configuration of the light source 10 used in the video display apparatus of FIG. FIG. 4 is a schematic perspective view showing the configuration of the light source 10, the radiator 30, and the blower 31 used in the video display apparatus according to FIG. 1. FIG. 5 is a schematic perspective view showing the entire design housing 13 used in the video display device of FIG. Further, FIG. 6 is a schematic sectional side view partially showing the radiator 30, the design housing 13, and the optical engine 11 used in the video display device of FIG. The configuration and operation of the video display apparatus according to the present embodiment will be described below with reference to FIGS.

  The characteristic part of the video display device according to the present embodiment is basically the light source 10 including the light emitting element 20 that emits visible light, the radiator 30 including the radiation fins 43, and the air blowing for flowing the air. Device 31.

  As illustrated in FIGS. 1 and 4, the light source 10 is thermally connected to the radiator 30. Here, “thermally connected” means that heat is transferred between the two members due to heat conduction. Moreover, the air blower 31 is arrange | positioned so that air may flow with respect to the heat radiator 30. FIG. With this arrangement, the air sent from the blower 31 to the inside of the video display device is caused to flow by the radiating fins 43 (43 g and 43 br) of the radiator 30, and thus heat generated between the air and the radiating fins 43. The heat generated from the light source 10 is taken away by the transmission. Similarly, the air sent from the blower 31 is also caused to flow in the space (gap between the light emitting element 20 and the side surface of the optical engine 11) in which the light emitting element 20 (20g, 20b, 20r) is disposed, and as a result. Heat generated from the light emitting element 20 or the light source 10 is taken away by heat transfer generated between the air and the light emitting element 20 or between the air and the radiator 30. Thus, since each of the radiation fin 43 side of the radiator 30 and the light emitting element 20 side of the light source 10 can be cooled, the present video display device has a structure that can cool the light source 10 efficiently.

  Next, each component in the video display apparatus according to the present embodiment will be described.

  As shown in FIGS. 1 and 4, the video display device includes (1) a blue light source 10 b having a wavelength near 460 nm and emitting blue light as a light source 10, and (2) a green having a wavelength near 525 nm. A green light source 10g, and (3) a red light source 10r having a wavelength near 625 nm and emitting red light. In the following, reference numeral “10” is used to indicate a light source without specifying individual light sources.

  As shown in FIG. 3, the light source 10 is mainly composed of a light emitting element 20 and a metal circuit board 21. In this example, the light emitting element 20 is a light emitting diode. The light-emitting diode is also called an LED (Light Emitting Diode), and is a semiconductor element that emits light by applying a predetermined voltage to flow a current. In the present embodiment, since an existing light emitting diode is used as the light emitting element 20, a detailed description of the light emitting diode is omitted. The light emitting element 20 is not limited to a light emitting diode, and for example, a solid laser light emitting element may be used as the light emitting element 20. As shown in FIG. 4, the light emitting elements 20 include a green light emitting element 20g that emits green light, a blue light emitting element 20b that emits blue light, and a blue light emitting element 20r that emits red light. However, when the light emitting elements are described without specifying the individual light emitting elements, the reference numeral “20” is used.

  The light emitting element 20 has a rectangular light emitting surface and is a surface light source that emits light in a planar shape. As shown in FIG. 3, the light emitting element 20 is mounted on the metal circuit board 21 so as to be arranged at the center thereof. For the metal circuit board 21, it is desirable to use a material having high thermal conductivity in order to diffuse heat efficiently. More specifically, a material having a thermal conductivity of 50 W / (m · K) or more, more preferably a material having a thermal conductivity of 100 W / (m · K) or more is desirably used as the metal circuit board 21. A thermistor 22 for managing the temperature of the light emitting element 20 is mounted on the metal circuit board 21. A connector 23 for supplying a voltage to the light emitting element 20 is mounted on the metal circuit board 21. Further, the connector 23 is also used to transmit an electrical signal to the thermistor 22.

  As shown in FIGS. 1 and 4, this video display device includes (1) a radiator 30g for cooling the green light source 10g, and (2) a radiator 30br for cooling the blue light source 10b and the red light source 10r. And. In the following, reference numeral “30” is used to indicate a radiator without specifying individual radiators.

  The heat radiator 30g has a substantially square shape when the heat radiator 30g is viewed in front of the surface 40 on which the light source 10g is mounted. Further, the radiator 30br has a substantially rectangular shape when the radiator 30br is viewed from the front side from the surface 40 side on which the light source 10b and the light source 10r are mounted. It is desirable to use a material with high thermal conductivity for these radiators 30 in order to diffuse heat efficiently. More specifically, a material having a thermal conductivity of 50 W / (m · K) or more, more preferably a material having a thermal conductivity of 100 W / (m · K) or more is preferably used as a member of the radiator 30.

  The heat radiator 30 has a flat surface 40 on which the light source 10 is placed, and a large number of heat radiation fins 43 (43g, 43br) are formed on the back surface 40R of the surface 40. As for the heat radiation fins 43, it is desirable to form a large number of minute irregularities on the surface of the heat radiation fins 43 in order to increase the heat radiation area.

  As shown in FIGS. 1, 4, and 6, the video display apparatus includes a blower 31. Here, the blower 31 has a size substantially the same as that of the radiator 30g. However, the size of the blower 31 is not limited to this size, and the size of the blower 31 may be set larger or smaller than the size of the radiator 30g. More specifically, the blower 31 is an axial fan having a function of blowing air in the direction of the rotation axis. However, the type of the blower 31 is not limited to this, and other types of fans such as a centrifugal fan may be used as the blower 31. The blower 31 includes a lead wire (not shown) for supplying a voltage necessary for driving the blower 31 and a sensor (not shown) for detecting the state of the blower 31 and its abnormality. .) In the present embodiment, detailed description about the blower 31 is omitted, but the existing blower is used only as the blower 31, and here, the external cold air of the blower 31 is imaged. In order to ensure the function as a blower for taking in the display device, the blower 31 is disposed between the intake portion 52 and the radiator 30g, which are used only as an intake portion. By using and arranging such a blower 31, the blower 31 only sucks external cold air and blows it into the video display device. Therefore, the blower blows the air inside the video display device to the outside. The life of the blower 31 can be extended compared with the case where it is used together as a fan.

  As shown in FIG. 1, the video display apparatus includes an optical engine 11 and a projection lens 12.

  The optical engine 11 has a plurality of optical elements mounted inside the housing of the optical engine 11. More specifically, a collimator lens, a dichroic mirror, a fly-eye lens, a mirror, a relay lens, and a total reflection prism are mounted as optical elements. Further, a display device (not shown) is mounted inside the housing of the optical engine 11. Here, the display device is a reflective display element in which a large number of mirrors are formed and the direction of the light beam is controlled by mechanically controlling the angle of the mirror. The optical element is not limited to the above-described one, and the optical engine 11 can be configured using various optical elements. Further, the display device is not limited to the above-mentioned ones. For example, a reflective display device using liquid crystal or a transmissive display device using liquid crystal may be used as the display device. . It is desirable to use a material having high thermal conductivity for the housing of the optical engine 11 in order to diffuse heat efficiently. More specifically, it is desirable to use a material having a thermal conductivity of 50 W / (m · K) or more, more preferably, a thermal conductivity of 100 W / (m · K) or more for the casing of the optical engine 11. . Further, in order to suppress reflection of light emitted from the light source 10 when light propagates through each optical element, it is desirable to apply an antireflection treatment to the surface of the casing of the optical engine 11. More specifically, it is desirable to perform black alumite treatment.

  As shown in FIGS. 1 and 6, the video display device includes a design housing or a metal housing 13. 1 and 6 are views partially showing the design housing 13, and FIG. 5 is a view showing the design housing 13 as a whole.

  The design housing 13 includes one light extraction part 51, one intake part 52, and one exhaust part 53. A radiator 30 having a light source 10, a blower 31, an optical engine 11, a projection lens 12, an electronic circuit board (not shown), and the like are fixedly attached to the design housing 13. It is desirable to use a material having high thermal conductivity for the design housing 13 in order to diffuse heat efficiently. More specifically, it is desirable to use a material having a thermal conductivity of 50 W / (m · K) or higher, more preferably, a thermal conductivity of 100 W / (m · K) or higher for the design housing 13.

  Next, the arrangement of the constituent members in the video display apparatus according to the present embodiment will be described.

  As illustrated in FIGS. 1 and 4, the blue light source 10 b and the red light source 10 r are arranged so that their optical axis directions are substantially parallel to each other. On the other hand, the green light source 10g is arranged so as to be substantially perpendicular to the optical axis directions of the blue light source 10b and the red light source 10r. That is, each of the light sources 10b, 10r, and 10g is arranged to form an L shape when the light source 10 is viewed from above. However, the arrangement of the light sources 10 is not limited to this. For example, when the light sources 10 are viewed from above such that the optical axis directions of the respective light sources 10 are substantially parallel, The light source 10 may be arranged so that 10b and 10g are aligned in a straight line.

  As shown in FIGS. 1 and 4, the light source 10 is arranged in the order of a green light source 10 g, a blue light source 10 b, and a red light source 10 r when viewed from the air blower 31 side. This arrangement corresponds to the order of the calorific value of the light source 10.

  The light source 10 and the radiator 30 are integrated with each other by being fixed to each other by screwing in a state where the light source 10 and the radiator 30 are positioned. And the surface (the front surface 40 of the heat radiator 30 and the back surface 21R (FIG. 3) of the metal circuit board 21 of the light source 10) where the light source 10 and the heat radiator 30 are thermally connected to each other is fixed by the above screwing. It is in a state where the pressure of is generated. In the thermal connection between the light source 10 and the radiator 30, in order to remove the air layer caused by the minute irregularities on the surfaces 40 and 21 R that thermally connect the portions 10 and 30 to each other, It is desirable to attach both portions 10 and 30 with a material having high thermal conductivity having More specifically, it is desirable to use a material having a thermal conductivity of 1 W / (m · K) or more, more preferably a material having a thermal conductivity of 5 W / (m · K) or more, for example, Silicon grease is used. As shown in FIG. 1, the radiator 30 is fixed to the housing of the optical engine 11 by screwing.

  The air blower 31 is arrange | positioned so that the heat radiator 30g may be opposed, and is being fixed to the design housing | casing 13 by screwing. The optical engine 11 and the projection lens 12 are also fixed to the design housing 13 by screwing. In addition, although screwing is used here as a method of fixing each member, it is not limited to this, For example, you may fix both members by the method of fitting a member and a member. .

  FIG. 6 is a view partially showing the radiators 30br and 30g, the optical engine 11, and the design housing 13. As shown in FIG. As shown in FIG. 6, the heat radiator 30 and the optical engine 11 flow into the light emitting element 20 side of the light source 10 by the surface 40 of the heat radiator 30 and the side wall of the optical engine 11 facing the surface 40. Similarly, a flow path is formed. Further, as shown in FIG. 6, the radiator 30 and the design housing 13 are separated from each other so that the air flows to the radiation fin 43 side of the radiator 30 by the radiator 30 and the side wall of the design housing 13. A flow path is formed. Further, as shown in FIG. 1, a flow path on the light emitting element 20 side of the light source 10 and a flow path on the heat radiation fin side 43 of the radiator 30 are formed by the top plate and the bottom plate (see FIG. 5) of the design housing 13. Has been.

  As shown in FIGS. 5 and 6, the design housing 13 includes one intake portion 52 and one exhaust portion 53. The intake section 52 is formed in the design housing 13 at substantially the same position as the blower 31 and with substantially the same dimensions. The exhaust part 53 is formed in the design housing 13 with substantially the same dimensions as the intake part 52 in a mode facing the one end side of the radiator 30br. Both the intake part 52 and the exhaust part 53 have substantially the same aperture ratio. The number, arrangement, and dimensions of the intake section 52 and the exhaust section 53 are not limited to this example, and for example, two intake sections and two exhaust sections may be provided, respectively. .

  Next, the operation in the video display apparatus according to this embodiment will be described.

  FIG. 2 is a diagram showing the flow of air in the video display apparatus shown in FIG. In FIG. 2, the arrows indicate the flow of air. As shown in FIG. 2, when a voltage is applied to the blower 31 to drive the blower 31, air is taken into the interior of the design housing 13 from the intake portion 52. The air taken in this way first reaches the radiation fins 43g of the radiator 30g, passes through the gap between the radiation fins 43g, and then branches in two directions. One air flow is a flow path that flows to the radiator 30br side as the first path, and the other one air flow is a flow that reaches the light emitting element 20g side of the green light source 10g as the second path. Road.

  The air that has reached the first path reaches the radiator 30br, passes through the gap between the radiation fins 43br, reaches the exhaust part 53, and is discharged from the exhaust part 53 to the outside (first flow path). ).

  On the other hand, the air reaching the second path reaches the green light source 10g side, and passes through the light emitting element 20g of the green light source 10g and its peripheral portion. Further, the air that has passed through the light emitting element 20g and its peripheral part sequentially reaches the space where the blue light source 10b and the red light source 10r are arranged as a third path ((second path + third path) = Second flow path). Similar to the second path, the air sequentially passes through the blue light emitting element 20b and its peripheral portion, and the red light emitting element 20r and its peripheral portion, respectively. Then, the air reaches the exhaust part 53 so as to bypass the radiator 30br and is discharged from the exhaust part 53 to the outside.

  In the air flow as described above, when the air passes, heat exchange occurs between the air and each member due to heat transfer, and the air finally takes away the heat of each member. It is discharged from the exhaust part 53 to the outside.

  By the way, the light emitting element 20 emits light by applying a predetermined voltage and flowing a current. However, most of the input power is consumed as heat. The heat generated in this way is transmitted from the light emitting element 20 to the metal circuit board 21 on which the light emitting element 20 is mounted, and the heat diffuses almost uniformly throughout the metal circuit board 21. That is, the metal circuit board 21 has a substantially uniform heat distribution on the back surface 21R located on the opposite side to the surface on which the light emitting element 20 is mounted. For this reason, the light source 10 can be considered as one heat source.

  Next, the heat of the light source 10 that is a heat generation source is transferred to the radiator 30 that is thermally connected to the light source 10. Further, the heat is transferred to the radiation fins 43 of the radiator 30. At this time, the higher the thermal conductivity of the material constituting the radiator 30, the more uniformly the heat can be diffused into the radiation fins 43. As described above, the heat diffused to the radiating fins 43 in this way moves from the radiating fins 43 to the air by heat exchange with the air by heat transfer, and the heat of the radiating fins 43 is deprived. The fins 43 or the radiator 30 can be cooled.

  On the other hand, in the vicinity of the light emitting element 20, the light emitting element 20 and the radiator 30 cause heat exchange with the air by the heat transfer described above, and heat is transferred from the light emitting element 20 and the radiator 30 to the air. Thus, the heat of the light emitting element 20 and the radiator 30 is taken away by the air, and as a result, the light emitting element 20 and the radiator 30 can be cooled.

  Furthermore, since the heat radiator 30 is thermally connected to the housing of the optical engine 11, heat is transferred to the housing of the optical engine 11. For this reason, the heat moved to the casing of the optical engine 11 can be radiated from the casing.

  According to the configuration of the present embodiment described above, the heat radiation fin 43 side of the radiator 30 and the light emitting element 20 side of the light source 10 can be cooled, respectively. The temperature rise of the light-emitting element 20 due to can be suppressed. As a result, it is possible to increase the brightness of the light source 10 by supplying more power to the light source 10. And since the temperature rise of the member which comprises the light source 10, and the surrounding member of the light source 10 is suppressed and deterioration of the material accompanying a temperature rise can be reduced, durability of these materials can be improved. . Furthermore, since the air volume required for the blower 31 can be reduced by improving the cooling efficiency, noise generated in the blower 31 can be reduced.

  In the present embodiment, three light sources 10 are used. However, the present invention is not limited to this configuration. For example, one light source 10 that emits white light may be used. Two or more of each of the green light source 10g, the blue light source 10b, and the red light source 10r may be used.

  In the present embodiment, the light source 10 is arranged in the order of the green light source 10g, the blue light source 10b, and the red light source 10r from the intake section 52 to the exhaust section 53. The order of arrangement of the light sources 10 may be changed according to the amount of heat generated by the light sources 10. For example, the light source 10 may be arranged in the order of low heat generation from the side closer to the intake section 52, whereby the temperature rise of air from the intake section 52 to the exhaust section 53 can be minimized. In addition, the light sources 10 may be arranged in descending order of the temperature dependency of the light emitting element 20 from the side closer to the intake section 52. In this case, the temperature dependency of the light emitting element 20 can be minimized. As a result, the light source 10 can be cooled more efficiently. Moreover, the brightness of the light source 10 can be improved.

  Further, two or more light sources 10 may be thermally connected to the radiator 30. As in the present embodiment, the blue light source 10b and the red light source 10r may be attached to one radiator 30br, and further, the green light source 10g and the blue light source may be attached to one radiator 30. All of 10b and the red light source 10r may be attached. As a result, since the heat radiator 30 corresponding to each light source 10 is not required individually, the number of parts can be reduced. Furthermore, the number of assembly steps can be reduced. As a result, cost reduction can be achieved.

( Reference form 1 )
In the configuration example shown in the first embodiment, the air blower 31 is disposed so as to face the heat radiator 30g. Instead, as shown in FIG. 7, the air blower is provided on the side surface side of the heat radiator 30g. 31 may be arranged. In this case, an air intake portion (not shown) corresponding to the air intake portion 52 of the first embodiment is formed on a side surface portion (not shown) of the design housing formed to face the air intake side surface 31S of the blower 31. Z.) will be provided.

  In the case of the configuration of FIG. 7, air is taken into the interior of the design housing 13 from the intake portion by the blower 31. The air taken in this way reaches the radiation fin 43 side of the radiator 30 and the light emitting element 20 side of the light source 10. That is, a part of the taken-in air directly reaches the light emitting element 20 side of the light source 10 without passing through the heat radiating fins 43, so that the light emitting element of the light source 10 is compared with the configuration shown in the first embodiment. The lower temperature air can be supplied to the 20 side.

  According to the configuration as shown in FIG. 7, it is possible to more efficiently suppress the temperature rise due to heat generation from the light source 10, and thus the light emitting element 20. As a result, it is possible to increase the brightness of the light source 10 by supplying more power to the light source 10. And since the temperature rise of the member which comprises the light source 10, and the member of the periphery of the light source 10 is suppressed further, deterioration of the material accompanying a temperature rise can be reduced further, and the durability of a member can be improved further. . Furthermore, since the air volume required for the blower 31 can be further reduced by further improving the cooling efficiency, the noise generated in the blower 31 can be further reduced.

(Embodiment 2 )
The present embodiment relates to an improvement of the radiator 30 in the first embodiment or the reference embodiment 1 . That is, as shown in FIG. 8, in the configuration of the radiator 30, the radiation fins 43 may be further formed on the surface 40 of the radiator 30 to which the light source 10 is attached.

According to such a configuration, the heat dissipating area of the heat dissipating fins 43 of the heat dissipator 30 can be increased as compared with the case of the first embodiment and the reference embodiment 1 , and the cooling capacity is further improved. Miniaturization of the radiator 30 can be realized. Further, the temperature rise due to the heat generated from the light source 10 and thus the light emitting element 20 can be further suppressed. As a result, it is possible to further increase the brightness of the light source 10 by supplying more power to the light source 10. Moreover, the temperature rise of the member which comprises the light source 10, and the member of the periphery of the light source 10 is suppressed more, As a result of reducing the deterioration of the material accompanying a temperature rise, the durability of a member can be improved more. Furthermore, since the air volume required for the blower 31 can be further reduced as the cooling efficiency is improved, the noise generated by the blower 31 can be further reduced.

(Appendix)
While the embodiments of the present invention have been disclosed and described in detail above, the above description exemplifies aspects to which the present invention can be applied, and the present invention is not limited thereto. In other words, various modifications and variations to the described aspects can be considered without departing from the scope of the present invention.

It is a perspective view which shows partially the internal structure of the video display apparatus concerning Embodiment 1 of this invention. It is a perspective view which shows typically the flow of the air in the video display apparatus shown in FIG. It is a perspective view which shows typically the structure of the light source used for the video display apparatus shown in FIG. It is a perspective view which shows partially the internal structure of the video display apparatus shown in FIG. It is a perspective view which shows the design housing | casing of the video display apparatus concerning Embodiment 1 of this invention. It is a perspective view which shows partially the internal structure of the video display apparatus shown in FIG. It is a perspective view which shows partially the internal structure of the video display apparatus which concerns on the reference form 1. FIG. It is a perspective view which shows typically the structure of the heat radiator of the video display apparatus concerning Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Light source, 10b Blue light source, 10g Green light source, 10r Red light source, 11 Optical engine, 12 Projection lens, 13 Design housing | casing, 30 Radiator, 31 Blower, 43 Radiation fin.

Claims (2)

A light source including a light emitting element that emits visible light; a radiator including a radiation fin; and a blower for flowing air; wherein the light source is thermally connected to the radiator; The blower device is a video display device arranged so that air flows with respect to the heat radiating fins of the radiator,
The light source is attached to one surface of the radiator,
The radiator includes the radiation fins on both the back surface and the surface of the surface to which the light source is attached,
The blower is disposed so as to face the back of the surface to which the light source of the radiator is attached,
Air taken into the video display device from the blower device is attached to the light source of the heatsink by the radiator and the first housing that houses the light source, the radiator, and the blower device. A first flow path passing through the heat dissipating fin on the back surface is formed;
The air after passing through the radiation fin reaches the light emitting element side of the light source from the radiation fin side by the radiator and the second casing accommodated in the first casing. A second flow path passing through the element side is formed ;
An optical engine equipped with an optical system and a display device for displaying an image;
The second housing is a housing of the optical engine;
The radiator and the housing of the optical engine are thermally connected,
The housing of the optical engine is
Having a side wall facing the surface to which the light source of the radiator is mounted;
The radiator and the light source are disposed between a side wall of the optical engine casing and a side wall of the first casing, and the first radiator and the side wall of the first casing define the first radiator. flow path is formed, and wherein the Rukoto provided as the second flow path is formed by said optical engine housing side walls and the radiator said light source mounting surface of,
Video display device. The video display device according to claim 1,
The radiator is thermally connected to two or more light sources as the light source,
The air flowing through the second flow path sequentially passes through the two or more light sources,
Video display device.

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