JP2018180077A - Light source device and display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of improving cooling efficiency. SOLUTION: A light source device is a method of a solid light source 11 that emits light, a light source frame 13 that holds the solid light source 11, and a light source frame 13 in a direction different from the light emission direction from the solid light source 11. It has heat conductive members 19 and 15c that come into contact with the wall surface 13b having a wire. [Selection diagram] Fig. 1

Description

  The present invention relates to a light source device using a solid light source.

  In recent years, with the progress of low power consumption and high luminance, solid light sources such as light emitting diodes and laser diodes (LDs) have been used as light sources of projection type image display devices.

  Patent Document 1 discloses a light source device including a laser holder for holding a laser diode, a lens holder for holding a lens of the laser diode, and a heat conducting member sandwiched between the laser holder and the lens holder. . According to the light source device of Patent Document 1, the heat conduction from the side surface of the laser diode to the laser holder can be promoted, and the cooling efficiency can be improved.

JP, 2014-139659, A

  In the case of a light source device provided with a laser holder that holds a plurality of laser diodes side by side as in Patent Document 1, as the number of laser diodes increases, the area of the laser emission direction and the surface in the opposite direction become wider.

  However, the laser diode has an electrode in the region opposite to the emission direction. For this reason, it is necessary to provide the electrical connection part which sends an electric power and control signal to the electrode of a laser diode in a laser holder, and the contact area of a laser holder and a cooling device reduces. As a result, the efficiency of heat conduction from the laser holder to the cooling device is reduced.

  Then, an object of this invention is to provide the light source device which can improve cooling efficiency, and the display apparatus using the same.

  The light source device as one aspect of the present invention is different from the first direction among a solid light source emitting light in a first direction, a light source frame holding the solid light source, and the light source frame. And a heat conducting member in contact with the wall having a direction normal.

  A display device as another aspect of the present invention includes the light source device, and an illumination optical system that illuminates light emitted from the light source device.

  Other objects and features of the present invention are described in the following examples.

  According to the present invention, it is possible to provide a light source device capable of improving the cooling efficiency and a display device using the same.

FIG. 1 is an external perspective view and an exploded perspective view of a light source device according to a first embodiment. FIG. 7A is an external perspective view of the light source device in Embodiment 2 and FIG. FIG. 14 is a schematic view of a cooling device in the third and fourth embodiments. FIG. 14 is an external perspective view and an exploded perspective view of a light source device according to a third embodiment. FIG. 14 is an external perspective view and an exploded perspective view of a light source device according to a fourth embodiment. FIG. 18 is a side view of an essential part of the light source device in the fourth embodiment. FIG. 18 is a block diagram of a projector in a fifth embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Solid-state light sources have a longer life than discharge lamps and can be used as maintenance-free light sources that do not need to be replaced once during the product life even when mounted on a projection type image display device is there. One of the problems of the solid state light source is that the calorific value is large compared to the lamp, and the performance guarantee temperature is lower than the lamp. For this reason, improvement of the cooling efficiency of a light source part is called for. Hereinafter, each example of the present invention will be described.

  First, with reference to FIG. 1, a light source device according to a first embodiment of the present invention will be described. FIG. 1 is a block diagram of the light source device 10 in this embodiment, FIG. 1 (A) is an external perspective view, and FIG. 2 (B) is an exploded perspective view. The light source device 10 includes a plurality of laser diodes (solid light sources, light source units) 11, a plurality of collimator lenses 12, a light source frame 13, an electrical connection portion 14, heat conductive greases 15a, 15b, 15c, 15d, a heat receiving member 16, heat A conductive member 19, a radiator 17, and a fastening screw 23 are provided.

  The laser diode 11 is provided with an electrode 18 in a region opposite to the light emission direction. The plurality of electrodes 18 are connected to the electrical connection unit 14 including a substrate, a flexible cable, and the like, and can externally input and output power and control signals. The light source frame 13, the heat conducting member 19, and the radiator 17 are fixed to the heat receiving member 16 by the fastening screw 23 via the heat conducting greases 15a, 15b and 15d, and the light source frame 13 is thermally conductive The heat conducting member 19 is in contact with the grease (sticking member) 15c. In the present embodiment, the heat conducting member 19 and the heat conducting grease 15c may be collectively referred to as a heat conducting member.

  The light source frame 13 holds a plurality of laser diodes 11. Further, a plurality of laser diodes 11 are thermally connected to the light source frame 13. The heat generated by the laser diode 11 is conducted and dissipated in the order of the mounting surface 13a of the light source frame 13, the heat conduction grease 15a, the heat receiving member 16, the heat conduction grease 15b and the radiator 17. The installation surface 13 a of the light source frame 13 is a bottom surface having a normal to the emission direction (light emission direction) of the laser light, and is a surface on which the electrical connection portion 14 is disposed. For this reason, the contact area of the light source frame 13 and the heat receiving member 16 is limited, and the thermal resistance is high.

  In the present embodiment, the heat conducting member 19 is disposed (fixed) in contact with the surface 13 b (wall surface having a normal in a direction perpendicular to the light emitting direction) perpendicular to the installation surface 13 a of the light source frame 13. There is. Therefore, the heat generated by the laser diode 11 is transferred from the heat transfer member 19 to the heat transfer member 19 through the heat transfer grease 15c, and further transferred from the heat transfer member 19 to the heat receiving member 16 through the heat transfer grease 15d. It can heat up. Thereby, the contact area (heat transfer area) of the light source frame 13 and the heat receiving member 16 is expanded, and heat can be efficiently transmitted to the radiator 17. Furthermore, the shape of the heat receiving member 16 can be simplified by using the heat receiving member 16 and the heat conducting member 19 as separate parts. In the present embodiment, the heat receiving member 16 and the radiator 17 are configured as separate parts, but this is not a limitation, and the heat receiving member 16 and the radiator 17 may be integrally configured. . Further, in the present embodiment, a laser diode is used as the solid light source, but the present invention is not limited to this, and another solid light source such as a light emitting diode (LED) may be used.

  In the present embodiment, the heat conducting member (heat conducting member 19 and heat conducting grease 15c) is in contact with the wall surface (surface 13b) of the light source frame 13 having a normal perpendicular to the light emitting direction from the laser diode 11. However, it is not limited to this. The heat conducting member of this embodiment may be configured to contact a wall surface having a normal different from the light emitting direction, not the normal normal to the light emitting direction. That is, the surface 13 b may be a wall surface having a normal line different from the light emission direction, and is not limited to the wall surface having a normal line perpendicular to the light emission direction. Further, in the present embodiment, the heat conducting member includes a metal body (heat conducting member 19) and a sticking member (heat conducting grease 15c) for sticking the heat conducting member 19 to the light source frame 13. Further, in the present embodiment, the sticking member is not limited to the heat conductive grease, and for example, another member such as a heat conductive sheet may be used.

  Further, in the present embodiment, the heat conducting members 19 are provided on the side surface portions (facing surfaces 13 b facing each other) of the electrical connection portion 14, but the present invention is not limited to this. The heat conducting member 19 may be provided on only one side surface (one surface 13b) or may be further provided on the side surface behind the electrical connection portion 14 and provided on a total of three side surfaces (three surfaces 13b) . In the present embodiment, the height of the heat conducting member 19 is preferably the same as or higher than the light source frame 13, but the height of the heat conducting member 19 is 2/3 or more of the height of the light source frame 13. I hope there is.

  Next, with reference to FIG. 2, a light source device according to a second embodiment of the present invention will be described. FIG. 2 is a block diagram of the light source device 10a in the present embodiment, FIG. 2 (A) is an external perspective view, and FIG. 2 (B) is an exploded perspective view.

  The light source device 10a of the present embodiment has a heat conduction member 24 in which the heat reception member 16 and the heat conduction member 19 are integrally formed instead of the heat reception member 16 and the heat conduction member 19 of the light source device 10 of the first embodiment. The light source device 10 is different from the light source device 10 according to the first embodiment in the point. The other configuration of the light source device 10a is the same as that of the light source device 10, and thus the description thereof is omitted.

  In the present embodiment, the heat conducting member 24 has a convex shape so as to be in contact with the installation surface 13 a of the light source frame 13 and the surface 13 b perpendicular to the installation surface 13 a. That is, the heat conducting member 24 has a direction different from the light emitting direction of the first portion 24 a of the light source frame 13 in contact with the bottom surface (installation surface 13 a) having the normal to the light emitting direction. And a second portion 24b in contact with the wall surface (surface 13b) having a normal to Therefore, heat can be transferred from the mounting surface 13a of the light source frame 13 and the surface 13b perpendicular to the mounting surface 13a to the heat conduction member 24 through the heat conduction greases 15a and 15c. Thereby, the contact area (heat transfer area) of the light source frame 13 and the heat conduction member 24 is expanded, and heat can be efficiently transmitted to the radiator 17. In the present embodiment, the heat conducting member 24 and the radiator 17 are configured as separate parts, but the invention is not limited to this, and the heat conducting member 24 and the radiator 17 are integrally configured. It is also good.

  Next, with reference to FIG. 3 and FIG. 4, the light source device in Example 3 of this invention is demonstrated. FIG. 3 is a schematic view of a cooling system 30 in the present embodiment. FIG. 4 is a block diagram of the light source device 10b in this embodiment, FIG. 4 (A) is an external perspective view, and FIG. 4 (B) is an exploded perspective view.

  As shown in FIG. 3, the cooling system 30 includes a jacket 20 which is a heat receiving member having a refrigerant flow path, a tank 31, a pump 32, a radiator 33, and a pipe 34. As the refrigerant pressurized by the pump 32 flows in the pipe 34, the heat is transmitted from the jacket 20 to the radiator 33 to dissipate heat. The radiator 33 is cooled by the air blown from the fan 35. The jacket 20 is disposed in the direction opposite to the emission direction of light from the laser diode 11 to the illumination optical system 40 of the projector.

  As shown in FIG. 4, a light source device 10 b of this embodiment is a jacket (cooling device) 20 including a jacket lid 21 and a jacket flow passage member 22 instead of the heat receiving member 16 of the light source device 10 of Embodiment 1. The light source device 10 is different from the light source device 10 according to the first embodiment in that The other configuration of the light source device 10 b is the same as that of the light source device 10, and thus the description thereof is omitted.

  In the present embodiment, the jacket lid 21 and the jacket flow path member 22 are connected by brazing or by screw fastening via a sealing member such as an O-ring. The light source frame 13 and the heat conducting member 19 are fixed to the jacket 20 by the fastening screw 23 via the heat conducting greases 15 a and 15 d. The light source frame 13 and the heat conducting member 19 are disposed in contact with each other via the heat conducting grease 15 c.

  In the present embodiment, heat is transferred from the installation surface 13 a of the light source frame 13 to the jacket 20 via the heat conduction grease 15 a. Furthermore, the surface 13 b perpendicular to the installation surface 13 a of the light source frame 13 and the heat conducting member 19 are arranged to be in contact with each other. Therefore, the heat generated from the laser diode 11 is transferred from the surface 13b perpendicular to the installation surface 13a to the heat conducting member 19 via the heat conducting grease 15c, and further from the heat conducting member 19 via the heat conducting grease 15d. The heat can be transferred to the jacket 20. Thereby, the contact area (heat transfer area) of the light source frame 13 and the jacket 20 is expanded, and heat can be efficiently transmitted to the radiator 33. In the present embodiment, the jacket lid 21 is provided on the light source frame 13 side, and the jacket flow channel member 22 is provided on the opposite side. However, the present invention is not limited thereto. The jacket lid 21 may be provided on the opposite side.

  Next, a light source device according to a fourth embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a block diagram of the light source device 10c in the present embodiment, FIG. 5 (A) is an external perspective view, and FIG. 5 (B) is an exploded perspective view. FIG. 6 is a side view of an essential part of the light source device 10c.

  As shown in FIG. 5, in the light source device 10c of the present embodiment, a jacket (cooling device) 20a in which a heat conduction member 25 is integrally formed instead of the jacket 20 of the third embodiment is used. Is different from the light source device 10b. That is, in the present embodiment, the heat conducting member 25 constitutes a part of the cooling device.

  The jacket 20 a has a jacket flow passage member 22 and a heat conduction member 25 provided with a flow passage 26. The heat conducting member 25 has a first portion 25 a of the light source frame 13 in contact with a bottom surface (installation surface 13 a) having a normal to the light emitting direction, and a direction different from the light emitting direction of the light source frame 13. And a second portion 25b in contact with the wall surface (surface 13b) having a normal. The flow passage 26 disposed inside the heat conducting member 24 is configured to be capable of taking in and out the refrigerant between the jacket flow passage member 22 and the outside of the jacket 20 a. In addition, since the other structure of the light source device 10c is the same as that of the light source device 10b, those description is abbreviate | omitted.

  The light source frame 13 is fixed to the jacket 20a by the fastening screw 23 via the heat conductive greases 15a and 15c. The light source frame 13 and the jacket 20 a are disposed in contact with the mounting surface 13 a of the light source frame 13 and a surface 13 b perpendicular to the mounting surface 13 a. The heat conducting member 25 and the jacket flow path member 22 are connected by brazing or by screw fastening via a sealing member such as an O-ring.

  The jacket 20 a has surfaces in contact with the mounting surface 13 a of the light source frame 13 and the surface 13 b perpendicular to the mounting surface 13 a, and has the flow passage 26 inside the heat conducting member 25. As a result, the contact area (heat transfer area) from the light source frame 13 is expanded, and the distance between the heat source and the flow path is shortened, so heat can be more efficiently transmitted to the radiator.

  As shown in FIG. 6, the heat transfer member 25 is provided so that the flow path 26 provided inside the heat transfer member 25 more efficiently transfers the heat of the highest temperature portion of the light source frame 13. It is preferable to arrange | position so that the center part 27 may be passed, when it sees from the side of. When viewed from the side, the central portion 27 is, for example, in the range of 1/3 of the total length of the heat conducting member 25 (or the jacket 20 a) with respect to the center C. The central portion 27 also includes a bent portion of the L-shaped flow passage 26.

  Next, with reference to FIG. 7, a display apparatus (projection display apparatus) according to a fifth embodiment of the present invention will be described. FIG. 7A is a block diagram of the projector 1000 (projection type display device), and FIG. 7B is a block diagram of the light source unit 100. As a light modulation element of the projector 1000, a reflective liquid crystal panel is used. In FIG. 7A, 100 is a light source unit, 200 is an illumination optical system, 300 is a color separation / combination optical system, and 400 is a projection optical system. The light source unit 100 emits light toward the illumination optical system 200. The illumination optical system 200 illuminates the light from the light source unit 100. The color separation / combination optical system 300 performs color separation and color combination on the illumination light from the illumination optical system 200. The projection optical system 400 projects the combined light from the color separation / combination optical system 300. The projection optical system 400 may be detachable from the projector 1000.

  The color separation / combination optical system 300 includes a dichroic mirror 500, a wavelength selective phase plate 501, and a first PBS 502. The color separation / combination optical system 300 further includes a red wave plate unit 302R, a green wave plate unit 302G, a blue wave plate unit 302B, a second PBS 503, and a color synthesis prism 504.

  The dichroic mirror 500 transmits green light of the white light from the light source unit 100 and reflects red light and blue light. The wavelength selective phase plate 501 maintains the polarization state of red light incident as s-polarization, and converts blue light incident as s-polarization into p-polarization. The first PBS 502 reflects red light incident as s-polarized light and transmits blue light incident as p-polarized light. The second PBS 503 reflects green light incident as s-polarized light. The color combining prism 504 reflects the green light and guides the light to the projection optical system 400. The color combining prism 504 transmits the red light and the blue light to the projection optical system 400.

  In FIG. 7B, reference numerals 101a and 101b denote light source devices (corresponding to any one of the light source devices 10, 10a, 10b, and 10c of the embodiments). Reference numerals 102a and 102b denote condenser lens systems, reference numeral 112 denotes a dichroic mirror, reference numeral 120 denotes a condenser lens system, and reference numeral 130 denotes a phosphor wheel. The phosphor wheel 130 has a phosphor layer 131 for converting the wavelength of light.

  The light source device 101a emits blue light (B light). The B light passes through the condenser lens system 102 a and is guided to the dichroic mirror 112. The dichroic mirror 112 transmits B light. Therefore, the light flux from the light source device 101 a passes through the dichroic mirror 112 and the condenser lens system 120 and is guided to the phosphor wheel 130. A part of the B light incident on the phosphor wheel 130 is converted into yellow light (Y light) by the phosphor layer 131. Y light includes red light (R light) and green light (G light). The Y light passes through the condenser lens system 120 and is guided to the dichroic mirror 112. The Y light is reflected by the dichroic mirror 112 and guided in the direction of the arrow 140 in FIG. 7B.

  The light source device 101 b emits blue light (B light). The B light passes through the dichroic mirror 112 and is guided in the direction of the arrow 140. The light guided in the direction of arrow 140 includes Y light and B light, and Y light includes R light and G light. Therefore, the light source unit 100 can emit light including R light, G light and B light. The light source unit 100 shown in FIG. 7B is merely an example, and the present embodiment is also applicable to light source devices having other configurations. In the present embodiment, in the case of using a light source device emitting each of R, G and B lasers as a light source device, it is not necessary to use a fluorescent layer.

  In the color separation / combination optical system 300 shown in FIG. 7A, 301R, 301G, and 301B are light modulation elements for red, green, and blue (reflection type liquid crystals for red, green, and blue, respectively). Panel) is a reflective liquid crystal panel unit. Reference numerals 302R, 302G, and 302B denote wave plate units provided with red, green, and blue wave plates, respectively. In the present embodiment, the light modulation elements included in each of the reflective liquid crystal panel units 301R, 301G, and 301B are reflective liquid crystal panels, but the present invention is not limited to this. For example, a transmissive liquid crystal panel may be used as the light modulation element. Regardless of the number of reflective liquid crystal panels, the present invention can be applied to any single-plate type or three-plate type projector. In addition, although a projection type display apparatus was demonstrated as a display apparatus in a present Example, a present Example is applicable also to display apparatuses other than a projection type.

  According to each embodiment, it is possible to provide a light source device capable of improving the cooling efficiency and a display device using the same.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the present invention.

10 light source device 11 laser diode (solid light source)
13 light source frame 15c heat conduction grease (heat conduction member)
19 heat conduction member

Claims (11)

A solid light source that emits light;
A light source frame holding the solid light source;
A light source device comprising: a heat conducting member in contact with a wall surface having a normal to a direction different from a light emitting direction from the solid light source in the light source frame. It further comprises a heat receiving member in contact with the light source frame,
2. The light source device according to claim 1, wherein the heat receiving member is in contact with a bottom surface of the light source frame having a normal to the light emission direction. The heat conducting member is
A first portion of the light source frame in contact with a bottom surface having a normal to the light emission direction;
2. The light source device according to claim 1, further comprising: a second portion of the light source frame in contact with a wall surface having a normal to a direction different from the light emission direction. The light source device according to claim 2 or 3, wherein the wall surface of the light source frame has a normal in a direction perpendicular to the light emission direction. The heat conducting member is
Metal body,
The light source device according to any one of claims 1 to 4, further comprising: a sticking member for sticking the metal body to the light source frame. The light source device according to claim 5, wherein the sticking member is a heat conductive grease or a heat conductive sheet. The light source device according to any one of claims 1 to 6, further comprising a cooling device that cools the solid-state light source. The light source device according to claim 7, wherein the heat conduction member has a flow path through which a refrigerant flows, and constitutes a part of the cooling device. The light source device according to claim 8, wherein the flow passage of the heat conduction member is disposed to pass through a central portion of the heat conduction member. The light source device according to any one of claims 1 to 9, wherein the solid state light source is a laser diode or a light emitting diode. A light source device according to any one of claims 1 to 10.
An illumination optical system that illuminates the light emitted from the light source device.