JP5168376B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device equipped with a laser light source device using a semiconductor laser.

  In recent years, attention has been focused on laser light as a light source of an image display device capable of displaying a large screen, and development of a technology of a semiconductor laser for forming the laser light is progressing. Compared with ultra-high pressure mercury lamps (UHP lamps) conventionally used as light sources for image display devices and light emitting diodes (LEDs) recently used in small image display devices, light sources using semiconductor laser light sources have a higher color. There are advantages such as reproducibility, instant lighting, long life, and high electric-light conversion efficiency.

  A conventional laser light source device will be described below. A conventional light source device includes a red laser light source, a blue laser light source, and a green laser light source, which are short wavelength laser light sources that continuously emit red (R) laser light, blue (B) laser light, and green (G) laser light. The red laser light source and the blue laser light source are semiconductor lasers that emit red and blue laser light, and the green laser light source is configured to emit a green laser light by converting the wavelength of the laser light of the semiconductor laser (for example, Patent Documents). 1).

JP 2010-32796 A

  The conventional image display apparatus projects an image having high color reproducibility using three colors of laser light as light sources. However, the image quality of the projected image is deteriorated by using the conventional image display device for a long time. Each of the three laser light sources has different temperature characteristics, and basically a rise in temperature of the laser light source causes a decrease in output. The output of the red laser light source device decreased particularly depending on the temperature rise. Therefore, the output of the red laser light source device tends to be weakened due to the temperature rise caused by long-term use of the conventional image display device. As described above, the laser light of one of the three colors is weakened, so that the conventional image display apparatus cannot output a high-quality image.

  Therefore, an object of the present invention is to provide an image display device that suppresses image quality deterioration.

In order to achieve the above object, an image display device of the present invention is coupled to a first housing and the first housing via a rotating portion so as to be rotatable, and projects an image from a projection port. A second housing, an air inlet and an air outlet in the second housing, and a cooling air passage formed in the second housing by connecting the air inlet and the air outlet; A blower that is a cooling unit that cools air by taking in air from the air inlet and exhausting air from the air outlet in the second housing, and first and second heat dissipating portions disposed on the cooling air passage. 2 and a third laser light source, and among the first to third laser light sources, the heat radiation part of the third laser light source having the best temperature characteristics is used as the heat radiation of the first and second laser light sources. than parts, arranged downstream of the cooling air passage, said second housing, said first through third laser light sources Lifting and these laser light sources heat is configured to include a main housing which heat is transferred.

  Since the image display device according to the present invention is configured as described above, the blower absorbs heat from the heat radiating portion of the first laser light source and the second laser light source and heat from the heat radiating portion of the third laser light source. Since it absorbs before, the thermal radiation part of the 1st and 2nd laser light source with a bad temperature characteristic compared with a 3rd laser light source can be cooled efficiently. Thereby, the heat radiation of the first and second laser light sources is particularly promoted, and the temperature rise of the first and second laser light sources is particularly suppressed. Thereby, even if the image display device is used for a long time, the output reduction of the first and second laser light sources is suppressed, so that the outputs of the three colors of laser light can be stably obtained. In addition, since the suction port and blower are mounted in a housing integrated with the main body of the image display device, the outside air can be efficiently used for heat dissipation without loss, and the cooling air passage can be shortened, so that the heat radiation of each laser light source is also good. It can be carried out. Therefore, it is possible to suppress image quality deterioration of an image projected by the image display device.

1 is a schematic perspective view of an image display device main body in an embodiment of the present invention. 1 is a schematic perspective view of a tilt state of an image display device according to an embodiment of the present invention. 1 is a schematic perspective view showing an internal configuration of an image display device according to an embodiment of the present invention. 1 is a schematic assembly diagram showing the internal assembly of an image display device in an embodiment of the present invention. The figure which shows an example of the cooling air path of the image display apparatus in the Example of this invention. The figure which shows the relationship between the service temperature of each color laser light source apparatus in the Example of this invention, and optical output. The figure which shows an example when the image display apparatus in the Example of this invention is attached to the electronic device.

The invention according to claim 1 of the present invention is a first housing and a second housing that is rotatably coupled to the first housing via a rotating portion and projects an image from a projection port. A cooling air passage formed in the second casing by connecting the inlet and the exhaust outlet to the second casing, and in the second casing. And a first blower, a second blower, a third blower disposed on the cooling air passage, and a blower that is a cooling unit that cools air by taking in air from the intake and exhausting air from the exhaust. A heat radiation part of the third laser light source having the best temperature characteristics among the first to third laser light sources, more than the heat radiation part of the first and second laser light sources. disposed downstream of the cooling air passage, said second housing holds said first through third laser light source of les The laser light source heat an image display apparatus configured to include a main housing which heat is transferred.

  According to the invention of claim 1 in the present invention, the blower absorbs the heat of the heat radiating portion of the first laser light source and the second laser light source before absorbing the heat of the heat radiating portion of the third laser light source. Since it absorbs, the heat radiation part of the 1st and 2nd laser light source with a bad temperature characteristic compared with a 3rd laser light source can be cooled efficiently. Thereby, the heat radiation of the first and second laser light sources is particularly promoted, and the temperature rise of the first and second laser light sources is particularly suppressed. Thereby, even if the image display device is used for a long time, the output reduction of the first and second laser light sources is suppressed, so that the outputs of the three colors of laser light can be stably obtained. In addition, since the suction port and blower are mounted in a housing integrated with the main body of the image display device, the outside air can be efficiently used for heat dissipation without loss, and the cooling air passage can be shortened, so that the heat radiation of each laser light source is also good. It can be carried out. Therefore, it is possible to suppress image quality deterioration of an image projected by the image display device.

  The image display device of the present invention will be described below with reference to the drawings. In addition, although the Example described below is a suitable specific example of this invention and limitation of technically favorable conditions is described, the scope of the present invention limits this invention especially in the following description. As long as there is no description, it is not restricted to these conditions.

Example 1
Embodiments of the present invention will be described below with reference to the drawings.

  First, the configuration of the image display apparatus main body will be described with reference to FIG. FIG. 1 is a schematic perspective view of an image display apparatus main body according to an embodiment of the present invention.

  In FIG. 1, an image display apparatus main body 100 uses laser light as a light source and projects it on a screen in an enlarged manner. The light source of the image display apparatus main body 100 is a green laser light source device 1 (first laser light source), a red laser light source device 2 (second laser light source), and a blue laser light source device 3 (third laser light source). There are three, and images are displayed by the laser light source devices 1 to 3 of three colors.

  The green laser light source device 1 mainly outputs green laser light by converting the infrared basic laser light which is invisible light into a half wavelength. The green laser holder 1a is a housing of the green laser light source device and fixes each element (for example, a semiconductor laser (first laser element) that outputs infrared basic laser light) stored in the green laser holder 1a. To do.

  The red laser light source device 2 outputs red laser light and uses the red laser holder 2a as a casing. The red laser holder 2a holds a semiconductor laser (second laser element) that outputs red laser light.

  The blue laser light source device 3 outputs blue laser light and uses the blue laser holder 3a as a casing. The blue laser holder 3a holds a semiconductor laser (third laser element) that outputs blue laser light.

  Here, the arrangement of the green laser light source device 1, the red laser light source device 2, and the blue laser light source device 3 will be described in detail. The blue laser light source device 3 is provided on the surface of the main body housing 200 that holds the projection lens 4, and guides the laser light from the blue laser light source device 3 into the main body housing 200.

  Further, the green laser light source device 1 and the red laser light source 2 are provided on the surface perpendicular to the surface on which the projection lens 4 and the blue laser light source device 3 are provided and on the side on which the blue laser light source device 3 is provided. .

  Here, the main body case 200 is provided with a protrusion 201 so that the surface on which the projection lens 4 and the blue laser light source device 3 are provided extends to the side on which the green laser light source device 1 is provided. That is, the protrusions 201 are provided integrally with the main body housing 200 at the corners of the main body housing 200. Note that the protrusion 201 may be provided as a separate member from the main body housing 200, but it is preferable to provide the protrusion 201 integrally because heat dissipation is facilitated.

  Further, the fixing surface 1b of the green laser holder 1a that fixes an element such as a SHG (Second Harmonic Generation) element or a semiconductor laser inside the green laser light source device 1 is in contact with the surface 201a of the protrusion 201. Yes. The surface 201a is a surface in contact with the fixed surface 1b in the protrusion 201.

  Further, the green laser light source device 1 is not in contact with the surface 202 of the main body casing 200 so that heat is not directly transmitted to the surface 202 of the main body casing 200, and a predetermined gap (0 in the present embodiment). .5 mm or less) and the red laser light source device 2 requires about 0.3 mm of the optical axis adjustment width of the red laser light source device 2, so that the green laser light source device 1 and the red laser light source device 2 The gap is 0.3 mm or more.

  In the present embodiment, the predetermined gap is set to 0.5 mm or less. If the predetermined gap is increased, the entire image display device becomes larger, or the green laser light source device 1 and a collimator lens (not shown) are used. This is because the green laser beam diffuses before reaching the collimator lens, and the light use efficiency deteriorates.

  By doing so, as described later, heat from the green laser light source device 1 can be made difficult to be transmitted to the red laser light source device 2, and the red laser light source device 2 having poor temperature characteristics can be used stably.

  The dichroic mirror 5 as the optical path guiding means and the dichroic mirror 6 as the optical path guiding means are configured by forming a film for transmitting or reflecting a laser beam having a predetermined wavelength on the surface.

  Reference numeral 7 denotes a field lens that converts the diffused laser light into a convergent laser. Reference numeral 8 denotes a PBS (Polarized Beam Splitter) which reflects each color laser beam and applies it to the spatial modulation element 9.

  The spatial modulation element 9 adjusts the deflection of each color laser beam and forms an image. The spatial modulation element 9 used this time is a reflective liquid crystal.

  Then, it passes through the projection lens 4 and projects a large screen image.

  Each color laser light from each color laser light source device 1 to 3 is collimated by each collimator lens, and each color laser beam collimated is guided to the diffusion plate by the dichroic mirrors 5 and 6. , PBS 8, reflected by the spatial modulation element 9, enlarged by the projection lens 4, and projected onto the screen.

  FIG. 2 is a schematic perspective view of the tilt state of the image display apparatus according to the embodiment of the present invention. As shown in FIG. 2, the image display device 10 includes a fixed unit 20 and a tilt unit 30. The tilt part 30 can be rotated with respect to the fixed part 20 about a hinge part (rotation shaft) 25. That is, the tilt unit 30 rotates around an axis that is perpendicular to the image projection direction from the image display apparatus main body 100 and the cooling air intake direction A (see FIG. 3) by the cooling fan 23 (see FIG. 3). The projection angle of the projection lens 4 can be adjusted. The tilt unit 30 on which the cooling fan 23 (see FIG. 3), the image display apparatus main body 100 (see FIGS. 1 and 3), and the like are mounted is pivoted up and down around the hinge portion (rotation shaft) 25. For this reason, it can suppress that the image projected by the projection lens 4 reflects on the installation surface of the image display apparatus 10.

  Next, the outline of the internal configuration of the image display apparatus 10 will be described with reference to FIGS.

  FIG. 3 is a schematic perspective view showing the internal configuration of the image display apparatus in the embodiment of the present invention. As shown in FIG. 3, the tilt unit 30 stores the image display apparatus main body 100, the cooling fan 23, fins, and the like described with reference to FIG. The cooling fan 23 shown in FIGS. 3 to 5 has a blower fan (not shown) in the cylindrical portion.

  A plurality of air inlets 21 a are provided on the upper surface 21 of the tilt unit 30. The side surface 31 of the tilt unit 30 is provided with a plurality of exhaust ports 31 a, and the side surface 32 of the tilt unit 30 is provided with a plurality of exhaust ports 32 a. Further, a projection port 33 for projecting an image is provided on the side surface 31 of the tilt unit 30, and the projection lens 4 is exposed to the outside of the image display device 10 through the projection port 33. The air discharged from the cooling fan 23 will be described below as cooling air.

  The cooling fan 23 stored in the tilt unit 30 sucks and discharges cooling air, and promotes heat dissipation inside the image display device 10. When the power is supplied, the cooling fan 23 rotates, takes cooling air from the outside of the image display device 10 from the side of the plurality of inlets 21a, and sends the cooling air in the direction of arrow A. The cooling air flows from the space between the cooling fan 23 and the bottom surface 34b of the fin 34 (see FIG. 4) to the exhaust ports 31a and 32a, and is exhausted from the exhaust ports 31a and 32a. Since the heat radiating portions of the respective color laser light source devices 1 to 3 stored in the tilt unit 30 are arranged on the cooling air path of the cooling air, the heat radiation from the respective color laser light source devices 1 to 3 is promoted. Here, the intake port 21a side of the cooling air passage is the upstream, and the exhaust ports 31a and 32a side of the cooling air passage is the downstream.

  In the first embodiment, a plurality of intake ports 21a and exhaust ports 31a and 32a are provided, but a single number may be used. The shapes of the intake port 21a and the exhaust ports 31a and 32a may be circular, elliptical, or polygonal, and are not particularly limited.

  Further, in the first embodiment, the air inlet 21a is provided on the upper surface of the tilt portion 30, but the air inlet is provided on the lower surface of the tilt portion 30 so that the cooling fan can be attached and the shape of the fin can be changed. May be configured.

  The cooling fan 23 is disposed below the intake port 21a (in the vertical direction of the intake port 21a), and is attached to the surface on which the intake port 21a is provided so as to be spaced from the bottom surface 34b (see FIG. 4) of the fin 34. . That is, the cooling fan is attached between the air inlet 21 a and the bottom surface 34 b of the fin 34.

  FIG. 4 is a schematic assembly diagram showing the internal assembly of the image display apparatus in the embodiment of the present invention. The red laser light source device 2 generally has the worst temperature characteristics among the color laser light source devices 1 to 3 (see FIG. 1). The fins 34 are formed of a member having high thermal conductivity and are a heat radiating portion of the red laser light source device 2, and assist heat dissipation of the red laser light source device 2. Since the fin 34 is connected to the red laser light source device 2, the heat generated by the red laser light source device 2 is transferred to the fin 34. The fins 34 are cooled by the cooling air discharged from the cooling fan 23. Thereby, the heat radiation of the red laser light source device 2 can be promoted. Further, the fin 34 has a structure that increases the heat radiation area (surface area), and can receive the cooling air from the cooling fan 23 in a wider area. For this reason, the heat dissipation of the red laser light source device 2 can be improved.

  A main body 34a of the fin 34 has an L-shape, and includes a fin bottom surface 34b and a mounting portion 34c to the red laser holder 2a. The attachment portion 34c is attached so as to be in close contact with the red laser holder 2a, and also serves as heat radiation of the red laser light source device attached to the red laser holder 2a.

  The fin bottom surface 34b is in contact with the bottom of the casing of the tilt unit 30 shown in FIG. 3 via a conductive sheet or the like (not shown). Therefore, the heat generated in the red laser light source device attached to the red laser holder 2a shown in FIG. 4 is not only dissipated by the cooling air sent by the cooling fan 23 of FIG. The heat is radiated to the outside via For this reason, the heat dissipation of the red laser light source device 2 can be further improved.

  Although not shown in FIG. 4, the end of the fin bottom surface 34 b faces the side of the cooling fan 23 that does not face the image display device main body 100 as shown in FIG. 3. A side wall may be further provided. In this case, it is generated in the red laser light source device attached to the red laser holder 2a shown in FIG. 4 and conducted to the side wall of the fin 34 shown in FIG. 3 through the attachment portion 34c and the fin bottom surface 34b of the fin 34. Heat is dissipated by the cooling air blown from the cooling fan 23. That is, further promotion of heat dissipation of the red laser light source device shown in FIG. 4 can be expected.

  In addition, although the red laser holder 2a and the fins 34 are separated, they may be integrated to improve thermal conductivity. By integrating, the red laser light source device 2 can easily dissipate heat. Thus, since it has the structure which guides outside air directly to the fin 34 which is a heat radiating part of the red laser light source device 2, the heat can be radiated more effectively.

  FIG. 5 is a diagram illustrating an example of the cooling air path of the image display device according to the embodiment of the present invention. In FIG. 3, the cooling air taken in from the outside of the image display apparatus 10 through the plurality of air inlets 21a by the cooling fan 23 in the direction of arrow A is changed to arrows B to C to D as shown in FIG. And a flow path to the arrow E.

  As described above, the fins 34 are heat radiating portions of the red laser light source device 2 and assist the heat radiation of the red laser light source device 2. The fin 35 is formed of a member having high thermal conductivity and is a heat radiating portion of the green laser light source device 1 and assists heat radiation of the green laser light source device 1. Further, the fins 35 have a structure in which the heat radiation area (surface area) is similarly increased, and the heat radiation performance of the green laser light source device 1 can be improved. From the above, the fins 35 promote heat dissipation of the green laser light source device 1.

  The fin 36 is formed of a member having high thermal conductivity and is a heat radiating portion of the image display device main body 100 (particularly, each color laser light source device 1 to 3), and assists heat dissipation of the image display device main body 100. The fin 36 includes a high step portion 36a and a low step portion 36b, and has a step structure in which a step is provided. The low stage portion 36b is provided to secure a space for electrical connection to the image display apparatus main body 100 (for example, the spatial modulation element 9). The spatial modulation element 9 is electrically connected to the control board 22 so that the control board 22 can control the spatial modulation element 9. Thereby, the image which PC300 wants to output can be formed. That is, the image display apparatus main body 100 can project an image that the PC 300 wants to output.

  All the surfaces of the high step portion 36 a on the image display apparatus main body 100 side are in contact with the main body housing 200. On the other hand, at least a part of the surface of the low step portion 36b on the image display apparatus main body 100 side is in contact with the main body housing 200, and the contact surface is on the high step portion 36a side.

  The reason why the surface where the low step portion 36b and the main body housing 200 are in contact with each other is thus limited because the spatial modulation element 9 is not actively cooled. The spatial modulation element 9 does not have to simply lower the temperature as in the respective color laser light source devices 1 to 3, but preferably maintains a temperature in a predetermined range. For example, when the temperature of the spatial modulation element 9 is 50 ° C. or higher, there is a possibility that image sticking that is not intended to be projected onto the image projected from the projection lens 4 occurs. Further, when the temperature of the spatial modulation element 9 is about 5 to 10 ° C., the reflectance of the spatial modulation element 9 is lowered. Therefore, this affects the image quality of the projected image.

  In view of this, the image display apparatus 10 of the present embodiment does not actively cool the spatial modulation element 9, so that the low step portion 36 b and at least a portion of the main body housing 200 facing the spatial modulation element 9 are not in contact with each other. did. Thereby, it can suppress that the spatial modulation element 9 is cooled more than necessary.

  In the first embodiment, the main body casing 200 and the fins 36 are separated from each other. However, it is preferable that the main body casing 200 and the fins 36 are integrated to improve thermal conductivity. By integrating, the main body casing 200, that is, the laser light source devices 1 to 3 of each color, can easily dissipate heat.

  Next, the heat radiation path of each color laser light source device 1 to 3 will be described in detail. Further, it will be described that the heat dissipation of the image display apparatus 10 in the present embodiment is improved based on these heat dissipation paths.

  The heat generated by the heat generating part (such as a semiconductor laser that outputs infrared basic laser light) in the green laser light source device 1 (see FIG. 1) is first transmitted to the green laser holder 1a. The heat transmitted to the green laser holder 1a is radiated from the surface in contact with the cooling air passage. Further, since the fins 36 cooled by the cooling air are at a low temperature, the heat transferred to the inside of the main body housing 200 is easily transferred to the fins 36. The heat transmitted to the fins 36 is dissipated by the cooling air passing through the flow path from the cooling fan 23 to the arrows B to C to D.

  The heat generated by the heat generating part (such as a semiconductor laser that outputs red laser light) in the red laser light source device 2 is first transmitted to the red laser holder 2a. The heat transferred to the red laser holder 2a is transferred to the fins 34. Since the fin 34 is provided on the cooling air passage, the heat transmitted to the fin 34 is absorbed by the cooling air. The flow path of the cooling air may be mainly the flow path from the cooling fan 23 to the arrow E, or may be used in combination with the flow path from the cooling fan 23 to the arrows B to C to D. good.

  The heat generated by the heat generating part (such as a semiconductor laser that outputs blue laser light) in the blue laser light source device (see FIG. 1) built in the blue laser holder 3a is transmitted to the blue laser holder 3a. Since the blue laser holder 3a is provided on the cooling air passage, the heat transferred to the blue laser holder 3a is absorbed by the cooling air passing through the flow path from the cooling fan 23 to the arrows B to C to D.

  Needless to say, the blue laser holder 3a may be provided with fins, and the structures of the fins 34 to 36 may be sword mountain-like or hierarchical, and are not particularly limited.

  Further, the main body housing 200 and the fins 36 are also used for heat radiation of the laser light source devices 1 to 3 (see FIG. 1). Since each color laser holder 1 a to 3 a is in contact with the main body case 200, the heat generated by each color laser light source device 1 to 3 (see FIG. 1) is transferred to the main body case 200. Further, since the fins 36 are in contact with the main body casing 200, the main body casing 200 is dissipated. Both the high step portion 36 a and the low step portion 36 b are in contact with the tilt portion 30. That is, the fin 36 can also radiate heat to the tilt part 30.

  Next, a cooling air passage (heat radiation passage) formed between the intake port 21a and the exhaust ports 31a and 32a will be described.

  The cooling air passage is a path of air until the air sucked from the suction port 21a is exhausted from the exhaust ports 31a and 32a.

  The cooling fan 23 attached to the tilt unit 30 sucks outside air from the suction port 21a (see FIG. 3) and takes the cooling air in the direction of arrow A (see FIG. 3). The cooling air from the cooling fan 23 directly cools the fins 34 connected to the red laser holder 2a to cool the heat generated from the red laser light source device.

  As described above, the first embodiment includes two cooling air paths. The first cooling air passage is guided from the cooling fan 23 in the order of arrows B, C, and D, and is finally exhausted from the exhaust port 31a. The second cooling air passage is led from the cooling fan 23 to the arrow E, and is finally exhausted from the exhaust port 32a. The cooling air cools the heat radiation portion of each color laser light source device interposed between the two cooling air passages, so that the heat radiation of each color laser light source device is promoted. That is, the temperature rise of each color laser light source device is suppressed. Hereinafter, these two cooling air paths will be described.

  As described above, the cooling fan 23 sucks the cooling air in the direction of the arrow A, cools the fins 34, and then the cooling air is guided in the directions of the arrow B and the arrow E by the guide 24. The cooling air passage is branched into the direction of arrow B and the direction of arrow E. Here, the cooling air passage that proceeds in the direction of arrow B is the first branch passage, and the cooling air passage that advances in the direction of arrow E is the second branch passage.

  First, the case where the cooling air proceeds in the direction of arrow B (first branch path) will be described. A guide 37 is provided in the tilt portion 30, and the guide 37 guides the cooling air guided in the direction of arrow B in the direction of arrow C. Thus, the cooling air first reaches the fins 35 and cools the fins 35. Next, the cooling air cools the blue laser light source device 3 (see FIG. 1) built in the blue laser holder 3a provided between the projection lens 4 and the fin 35, and from the exhaust port 31a (in the direction of arrow D). ) Discharged. As described above, the first cooling air passage is formed in the order of the arrows A, B, C, and D, and the cooling air absorbs the heat of the members interposed on the first cooling air passage.

  Next, the case where the cooling air proceeds in the direction of arrow E (second branch path) will be described. The cooling air traveling in the direction of arrow E is the cooling air guided to the exhaust port 32a. This cooling air cools the fins 36 to promote heat dissipation of the image display apparatus main body 100. The cooling air that has absorbed the heat of the fins 36 is discharged from the exhaust port 32a.

  As described above, the first cooling air passage is in the order of arrows A, B, C, and D, and the second cooling air passage is in the order of arrows A and E. Therefore, the cooling air flowing through the first cooling air path is the heat radiation portion (fin 34) of the red laser light source device 2 (see FIG. 1) built in the red laser holder 2a, and the green laser light source built in the green laser holder 1a. Cooling is performed in the order of the heat radiation part (fin 35) of the apparatus 1 (see FIG. 1) and the heat radiation part (blue laser holder 3a) of the blue laser light source device 3 (see FIG. 1) built in the blue laser holder 3a. The cooling air flowing through the cooling air path cools the heat radiating part (fin 34) and the fin 36 (image display device main body 100) of the red laser light source device 2. That is, the heat radiation of each color laser light source device is the red laser light source device 2 (see FIG. 1) built in the red laser holder 2a, the green laser light source device 1 (see FIG. 1) built in the green laser holder 1a, and the blue laser. Priority is given to the blue laser light source device 3 (see FIG. 1) built in the holder 3a. Thereby, image quality degradation of the image display apparatus 10 can be suppressed.

  Further, as will be described later, the green laser light source device 1 generally has the largest necessary current value, and the efficiency of conversion from electricity to light is poor, so that the amount of heat generation is the largest.

  Therefore, in the present embodiment, the image is so arranged that the heat radiating portion of the green laser light source device 1 is cooled in preference to the heat radiating portion of the red laser light source device 2 generally having the worst temperature characteristics among the laser light source devices of the respective colors. In the display device 10, a cooling air passage is formed. That is, the green laser light source device 1 is cooled preferentially over the blue laser light source device 3. That is, the heat radiation part (fin 35) of the green laser light source device 1 is cooled by the cooling air before absorbing the heat of the heat radiation part of the blue laser light source device 3.

  Therefore, the same effect can be achieved by installing the heat radiating portion of the blue laser light source device 3 on the downstream side of the cooling air passage of the heat radiating portions of the green laser light source device 1 and the red laser light source device 2.

  That is, since the heat radiating portion of the blue laser light source device 3 having good temperature characteristics is installed downstream of the cooling air passage, the blue laser light source device 3 is not affected by the waste heat of other laser light sources located upstream. Therefore, fluctuations in laser characteristics can be minimized.

  Further, the heat radiation part of the blue laser light source device 3 is installed on the downstream side of the cooling air passage to prevent the heat from diffusing to the upstream side, and the heat generated from the blue laser light source device 3 (see FIG. 1) while being less than the others. However, the influence on the green laser light source device 1 (see FIG. 1) that generates a large amount of heat and the red laser light source device 2 with poor temperature characteristics can be minimized.

  In addition, the heat radiating portion of the blue laser light source device 3 is installed downstream of the cooling air path. Depending on the arrangement of the laser light source device, the suction port, the cooling fan, the red laser light source device 2, the blue laser light source device 3, and the exhaust port. The same effect as described above is also obtained when the cooling air passage is divided into two routes, that is, the cooling air passage in this order and the cooling air passage in the order of the suction port, the cooling fan, the green laser light source device 1, the blue laser light source device 3, and the exhaust port. Similarly, the cooling air path is divided into two routes, namely, the cooling air passage in the order of the suction port, the cooling fan, the red laser light source device 2 and the exhaust port and the cooling air passage in the order of the suction port, the cooling fan, the green laser light source device 1 and the exhaust port. Even in the case of, it has the same effect as described above.

  Hereinafter, the reason why the permutation of the heat radiating portions of each color laser light source device is as described above will be described in detail with reference to FIG.

  FIG. 6 is a diagram showing the relationship between the operating temperature and the light output of each color laser light source device in the embodiment of the present invention.

  First, the reason why the red laser light source device 2 (see FIG. 1) radiates heat most preferentially will be described in more detail. As described above, the red laser light source device 2 generally has the worst temperature characteristics among the color laser light source devices 1 to 3. The temperature characteristic referred to here is a characteristic indicating a temperature range in which a light output exceeding the minimum required light output can be obtained by each color laser light source device.

  Each color laser light source device 1 to 3 has different temperature characteristics. From the characteristic diagram shown in FIG. 6, each color laser light source device 1 to 3 basically increases in temperature on the high temperature side, so that the light output thereof decreases, and among these, the output of the red laser light source device 2 is particularly fast. descend. For this reason, since the upper limit use temperature of the red laser light source device 2 is lower than other laser light source devices, it is preferable to preferentially suppress the temperature rise of the red laser light source device 2.

  Accordingly, in the first embodiment, as shown in FIG. 5, the fin 34 that serves as a heat radiating portion of the red laser light source device 2 (see FIG. 1) built in the red laser holder 2 a is provided in the vicinity of the cooling fan 23 of the tilt portion 30. Is provided. That is, the fin 34 which is a heat radiation part of the red laser light source device 2 is provided on the most upstream side in the heat radiation part of each color laser light source device 1 to 3 interposed in the cooling air passage. As a result, the cooling air guided into the tilt unit 30 is supplied to the fin 35 serving as a heat radiating unit of the green laser light source device 1 (see FIG. 1) built in the green laser holder 1a and the image display device main body 100 (see FIG. 1). Before cooling the fins 36 and the blue laser holder 3a, the fins 34 that serve as the heat sink of the red laser light source device 2 (see FIG. 1) built in the red laser holder 2a are cooled. That is, the cooling air cools the fins 34 before absorbing the heat of the fins 35 and 36 or other members in the tilt portion 30. Further, the fins 34 are cooled by a large volume of cooling air before branching into arrows B and E. By forming the cooling air passage in this way, the heat radiation portion (fin 34) of the red laser light source device 2 is preferentially cooled. Therefore, it is possible to preferentially suppress the output reduction of the red laser light source device 2 (see FIG. 1) having the worst temperature characteristics. Therefore, the image display apparatus main body 100 (see FIG. 1) can stably output a high-quality image.

  Next, the reason why the heat radiation of the green laser light source device 1 (see FIG. 1) is given priority over the red laser light source device 2 (see FIG. 1) will be described using FIG. 6 again.

  The temperature characteristics of the green laser light source device 1 (see FIG. 1) and the blue laser light source device 3 (see FIG. 1) are the same as the upper limit of the laser light source operating temperature as can be seen from FIG. However, among the laser light source devices 1 to 3 of each color, the green laser light source device 1 (see FIG. 1) generally requires the largest current value. As described above, the green laser light source device 1 (see FIG. 1) mainly outputs the green laser light by converting the infrared basic laser light. That is, the laser light emitted from the semiconductor laser passes through various elements (for example, SHG elements) until it is converted into green laser light. As a result, light loss occurs, so that the green laser light source device 1 (see FIG. 1) emits light compared to the red laser light source device 2 (see FIG. 1) and the blue laser light source device 3 (see FIG. 1). The efficiency of converting to is bad. That is, the green laser light source device 1 requires a larger amount of electric power than the red laser light source device 2 (see FIG. 1) and the blue laser light source device 3 (see FIG. 1) in order to produce a predetermined output amount. For this reason, the green laser light source device 1 (see FIG. 1) generally has the largest amount of heat generation among the laser light source devices of the respective colors. Accordingly, the heat generated by the green laser light source device 1 (see FIG. 1) is transmitted to the protrusion 201 (see FIG. 1) (that is, transmitted to the main body housing 200 (see FIG. 1)), and the red laser light source device 2 (see FIG. 1). ) And the blue laser light source device 3 (see FIG. 1) may be promoted. At this time, output reduction of the red laser light source device 2 (see FIG. 1) and the blue laser light source device 3 (see FIG. 1) is promoted.

  Therefore, in this embodiment, as shown in FIG. 5, the image display device 10 is configured to cool the green laser light source device 1 (see FIG. 1) in preference to the red laser light source device 2 (see FIG. 1). Is formed and a cooling air passage is formed. That is, the green laser light source device 1 (see FIG. 1) is preferentially cooled over the blue laser light source device 3 (see FIG. 1). That is, the heat radiation portion (fin 35) of the green laser light source device 1 (see FIG. 1) is cooled by the cooling air before absorbing the heat of the blue laser light source device 3 (see FIG. 1).

  As shown in FIG. 5, since a blower and three laser light sources are mounted in a rotatable movable body (tilt unit 30), the image display device is attached to a personal computer (hereinafter referred to as “PC”) or the like. Even when attached and rotated, the rotating body is outside and can be used without any loss by sucking outside air at any rotating position. And compared with the case of the apparatus which installs an air blower in the fixing | fixed part 20 and forms the air path which takes in cooling air to the tilt part 30, it does not consider the connection of the cooling air path of the fixing | fixed part 20 and the tilt part 30 Since the distance of the cooling air passage is shortened, it can be efficiently cooled. Thereby, even if an image display apparatus is used for a long time, the output fall of a green laser light source apparatus or a red laser light source apparatus is suppressed, Therefore The output of the laser beam of 3 colors can be obtained stably.

  Further, the blower can cool the heat radiating portion of the red laser light source before absorbing the heat of the heat radiating portion of the green laser light source and the blue laser light source. That is, the heat radiation part of the red laser light source having the worst temperature characteristic is cooled most preferentially. Thereby, the heat radiation of the red laser light source is particularly promoted. That is, the temperature rise of the red laser light source is particularly suppressed. Thereby, even if the image display device is used for a long time, the output reduction of the red laser light source is suppressed, and thus the output of the three colors of laser light can be stably obtained. In addition, since the suction port and blower are mounted in a housing integrated with the main body of the image display device, the outside air can be efficiently used for heat dissipation without loss, and the cooling air passage can be shortened, so that the heat radiation of each laser light source is also good. It can be carried out.

  FIG. 7 is a diagram illustrating an example when the image display apparatus according to the embodiment of the present invention is attached to an electronic apparatus. The image display apparatus 10 of the first embodiment may be used as a single unit, but may be attached to a PC 300 that is an electronic device as shown in FIG. The image display device 10 can be taken in and out of the PC 300 as needed, and the output on the display of the PC 300 can be projected onto a screen, a wall, or the like. Therefore, the output on the display of the PC 300 can be easily output on a large screen without separately connecting an image display device to the PC 300 with a wire or the like. Since necessary members for the display device such as the cooling fan 23 and the image display device main body 100 are mounted in the tilt unit 30, for example, when attached to the PC 300, only the minimum tilt unit 30 may be pulled out. . In this case, there is an advantage that it is not necessary to take a wide space for work.

  Note that the attachment position of the image display device 10 to the PC 300 is not limited to the right side shown in FIG. 7, and may be attached to the left side, the rear side, the front, or the like.

  When the image display device 10 is attached to the PC 300 (electronic device), the tilt unit 30 only has to protrude outside the PC 300 so that it can freely rotate. Therefore, it is only necessary that at least a part of the fixing unit 20 is fixed to the PC 300, and the surface side facing the side surface 31 may be fixed to the PC 300.

  Note that examples of electronic devices other than the PC 300 include a television, a display, an optical disc player, a portable optical disc player, and the like, and any device that displays an image may be used. In addition to these, the image display device 10 may be mounted on the electric device in order to project information on the electric device (for example, home appliances such as a refrigerator and a washing machine) to the outside.

  As described above, the image display device according to the present embodiment is configured in consideration of the temperature characteristics and the heat generation amount of each color laser light source device, and forms a cooling air passage. For this reason, image quality deterioration of the image display device due to long-time use is suppressed. In other words, the image display device can suppress deterioration in the image quality of the projected image and can stably output a high-quality image.

  The image display device of the present invention can be applied as a device capable of projecting a high-quality image stably for a long time in order to suppress a decrease in the output of laser light as a light source.

DESCRIPTION OF SYMBOLS 1 Green laser light source apparatus 1a Green laser holder 2 Red laser light source apparatus 2a Red laser holder 3 Blue laser light source apparatus 3a Blue laser holder 4 Projection lens 5, 6 Dichroic mirror 7 Field lens 8 PBS
DESCRIPTION OF SYMBOLS 9 Spatial modulation element 10 Image display apparatus 20 Fixed part 21 Upper surface 21a Air inlet 23 Cooling fan 24 Guide 25 Hinge part (rotating shaft)
30 Tilt portion 31, 32 Side surface 31a, 32a Exhaust port 33 Projection port 34, 35, 36 Fin 34a Main body 34b Fin bottom surface 34c Mounting portion 36a High step portion 36b Low step portion 37 Guide 100 Image display device main body 200 Main body case 201 Projection Part 201a, 202 surface 300 PC

Claims (3)

A first housing;
A second housing that is rotatably coupled to the first housing via a rotating portion, and projects an image from a projection port;
A cooling air passage formed in the second casing, having an inlet and an outlet in the second casing, and connecting the inlet and the outlet;
A blower which is a cooling means for taking in air from the intake port and exhausting air from the exhaust port in the second casing to cool the air;
A first, second, and third laser light source on which the heat dissipating portion is disposed on the cooling air passage;
Of the first to third laser light sources, the heat radiating portion of the third laser light source having the best temperature characteristics is located downstream of the cooling air passage from the heat radiating portions of the first and second laser light sources. Placed in
The image display apparatus, wherein the second casing includes a main body casing that holds the first to third laser light sources and to which heat of the laser light sources is transferred . The blower, most the temperature characteristics worse first be positioned directly above the heat radiating portion of the laser light source and said claim 1 the image display apparatus according. 3. The image display according to claim 2, wherein the first laser light source is a red laser light source, the second laser light source is a green laser light source, and the third laser light source is a blue laser light source. apparatus.