JP4771004B1 - Image display device - Google Patents

Abstract

An object of the present invention is to provide an image display device capable of suppressing deterioration of image quality and changing a projection direction.
The cooling fan is housed and has a fixed portion 20 having an upstream opening 38a for discharging air from the cooling fan 23, and a downstream opening 38b for sucking air discharged from the upstream opening 38a. In addition, a tilt part 30 for storing the image display apparatus main body 100 for projecting an image, and a hinge part 25 serving as a shaft for rotating the tilt part 30 from the fixed part 20 are provided, from the lowest point of the upstream opening 38a. The hinge portion 25 is controlled so that the projection in the vertical direction of the upstream opening 38a intersects the downstream opening 38b.
[Selection] Figure 10

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, in order to change the projection direction of the image display device, for example, the image display device needs to have two housings (a fixed portion and a tilt portion). The tilt unit accommodates the image display device main body, has a projection port, and is rotatable from the fixed unit. By rotating the tilt unit, the projection direction of the image display device could be changed.

  In this configuration, it is preferable to reduce the weight of the tilt portion in order to smoothly change the projection direction and to keep the tilt portion at a predetermined angle. For this reason, the cooling means for cooling the image display apparatus main body needs to be stored in the fixed portion, not in the tilt portion. That is, the cooling air passage for cooling the image display apparatus main body is formed by the fixed portion and the tilt portion. For this reason, it is necessary to send the air from the cooling means to the tilt portion by providing the first opening portion in the fixing portion and the second opening portion in the tilt portion.

  However, when the tilt portion rotates, a gap is generated between the fixed portion and the tilt portion. For this reason, if the tilt portion is freely rotatable, depending on the rotation angle of the tilt portion, the air from the cooling means is not sufficiently sent to the tilt portion. Therefore, since the laser light source device which is the light source of the image display device is not sufficiently cooled, the output of the laser light source device is reduced by using the image display device for a long time. As a result, the image quality of the image projected by the image display device deteriorated.

  In view of the above problems, the present invention suppresses image quality deterioration of an image display device by restricting the rotation angle of the tilt portion so that air can be sent from the first opening portion to the second opening portion. Objective.

  In order to achieve the above object, an image display apparatus according to the present invention stores a cooling unit and includes a fixing unit having a first opening for discharging air from the cooling unit, and a first opening. A second opening that sucks in the discharged air, a tilt unit that stores an apparatus main body that projects an image, and a hinge unit that serves as a shaft for rotating the tilt unit from the fixed unit, The hinge portion is controlled so that the vertical projection of the first opening portion from the lowest point of the first opening portion and the second opening portion intersect.

  Since the image display device of the present invention is configured as described above, in the image display device in which the projection direction can be changed by rotating the tilt unit, air from the cooling unit can be more reliably sent to the tilt unit. it can. For this reason, the apparatus main body in a tilt part can be cooled more reliably, and image quality degradation can be suppressed.

1 is a schematic perspective view of an image display device main body according to Embodiment 1 of the present invention. 1 is a schematic perspective view of an image display device in Embodiment 1 of the present invention. 1 is a schematic perspective view of a tilt state of an image display device in Embodiment 1 of the present invention. The figure which shows an example when the image display apparatus in Example 1 of this invention is attached to an electronic device. 1 is a schematic perspective view showing an internal configuration of an image display device in Embodiment 1 of the present invention. The figure which shows an example of the cooling air path of the image display apparatus in Example 1 of this invention. The figure which shows the relationship between the temperature of each color laser light source apparatus in Example 1 of this invention, and an output. The figure when the housing | casing of the image display apparatus in Example 1 of this invention is identified to three area | regions The figure which shows an example of the cooling air path of the image display apparatus in Example 1 of this invention. The figure which shows the cross section of the image display apparatus in Example 1 of this invention. The figure for demonstrating the relationship of the height of the tilt part of the image display apparatus in Example 1 of this invention, and a fixing | fixed part. The figure which shows the cross section of the image display apparatus in Example 2 of this invention. The figure which shows the cross section of the image display apparatus in Example 3 of this invention.

  According to a first aspect of the present invention, the cooling means is housed, and a fixing portion having a first opening for discharging air from the cooling means, and the air discharged from the first opening are sucked in. A tilt part that has a second opening and stores an apparatus main body that projects an image; and a hinge part that serves as a shaft for rotating the tilt part from the fixing part. The present invention relates to an image display device characterized in that the hinge is controlled so that the projection in the vertical direction of the first opening from the lowest point intersects the second opening.

  According to a second aspect of the present invention, the vertical projection of the first opening of the second opening is controlled so that the hinge includes the first opening. The present invention relates to a characteristic image display device.

  According to a third aspect of the present invention, there is provided the image display device characterized in that the first opening is disposed on the rotation direction side of the tilt portion in the fixed portion.

  According to a fourth aspect of the present invention, the control unit for controlling the apparatus main body is further stored in the fixed unit, and the control unit is placed on a cooling air passage formed between the cooling means and the first opening. The present invention relates to an image display device characterized by non-arrangement.

  According to a fifth aspect of the present invention, there is provided a projecting portion that is provided in the hinge portion and rotates together with the tilt portion, and a vertical direction of the first opening portion from the lowest point of the first opening portion. When the projection intersects with the lowest point of the second opening, the projection is in contact with the fixed part.

  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. Unless otherwise stated, it is not limited to these conditions.

Example 1
Embodiment 1 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 device main body according to Embodiment 1 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 device 2 are provided on a 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. Yes.

  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 casing 200, but it is preferable to provide the protrusion 201 integrally because it is easy to dissipate heat.

  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 side surface 201a of the protrusion 201. Yes. The side 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 large, the entire image display device becomes large, 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.

  Further, the respective color laser beams from the respective color laser light source devices 1 to 3 are collimated by the respective collimator lenses, and the collimated color laser beams are 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.

  Next, the outline of the image display apparatus of the present invention will be described with reference to FIGS. FIG. 2 is a schematic perspective view of the image display apparatus according to Embodiment 1 of the present invention. FIG. 3 is a schematic perspective view of the tilt state of the image display apparatus according to Embodiment 1 of the present invention. FIG. 4 is a diagram illustrating an example when the image display apparatus according to Embodiment 1 of the present invention is attached to an electronic device.

  The image display device 10 includes a housing 11 that stores members, and the housing 11 is classified into a fixed unit 20 and a tilt unit 30. The fixing unit 20 stores a control board, a cooling fan, and the like. The upper surface 21 of the fixing portion 20 is formed in a key shape and includes a plurality of air inlets 21a. The cooling fan is disposed under the intake port 21a (in the vertical direction of the intake port 21a, that is, in the negative direction of the arrow Y).

  The tilt unit 30 stores the image display apparatus main body 100 described above and fins described later. The side surface 31 of the tilt unit 30 includes a plurality of exhaust ports 31a, and the side surface 32 of the tilt unit 30 includes a plurality of exhaust ports 32a. Further, the tilt unit 30 is provided with a projection port 33 for projecting an image, and the projection lens 4 is exposed to the outside of the image display device 10 through the projection port 33.

  The cooling fan stored in the fixing unit 20 sucks outside air from the intake port 21a, and this air is exhausted from the exhaust ports 31a and 32a. A cooling air passage described later is formed between the intake port 21a and 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 interposed in the cooling air path, the heat radiation of 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.

  Note that there may be a plurality of intake ports 21a and exhaust ports 31a and 32a, or a single number. 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.

  In addition, as shown in FIG. 3, the tilt portion 30 can be rotated from the fixed portion 20 around a hinge portion (rotating shaft) 25. That is, the tilt unit 30 can be rotated in the direction perpendicular to the direction in which the image display apparatus main body 100 projects an image, and the projection angle of the projection lens 4 can be adjusted. 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.

  The image display device 10 may be used as a single unit, but as shown in FIG. 4, the image display device 10 may be attached to a PC (Personal Computer) 300 that is an electronic device. 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. For this reason, 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.

  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. However, it is preferable to fix the surface side facing the side surface 32 to the PC 300 in order to secure the air inlet 21a.

  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 may be anything as long as they can display images. In addition to these, the image display device 10 may be mounted on the electrical device in order to project information on the electrical device (for example, home appliances such as a refrigerator and a washing machine) to the outside.

  Next, the outline of the internal configuration of the image display apparatus 10 will be described with reference to FIG. FIG. 5 is a schematic perspective view showing the internal configuration of the image display apparatus in Embodiment 1 of the present invention. Hereinafter, each member will be described.

  The control board 22 controls the image display device 10. The control board 22 has a function as a control unit for the image display device main body 100 and a cooling fan 23 described later, a function as an interface unit for electrically connecting the PC 300 and the image display device main body 100, and the like. The image display device main body 100 and the cooling fan 23 are supplied with power from the control board 22.

  A cooling fan (blower) 23 as a cooling means sucks and discharges air and promotes heat dissipation inside the image display device 10. When the power is supplied, the cooling fan 23 rotates, takes air from the outside of the image display device 10 from the side of the plurality of air inlets 21a, and discharges air in the direction of the arrow A. The air discharged from the cooling fan 23 will be described below as cooling air.

  The guide 24 is provided on the control board 22 and guides the cooling air in a predetermined direction. Here, the guide 24 guides the cooling air released in the direction of the arrow A to the fin 34 described later.

  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 provided adjacent to the red laser light source device 2 and the tilt unit 30, 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 via the guide 24 and radiate heat to the tilt unit 30. 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. In addition, although the red laser holder 2a and the fins 34 are separated, it is preferable that they are integrated in order to improve thermal conductivity. By integrating, the red laser light source device 2 can easily dissipate heat.

  The recess 34a is provided to project the power supply terminal of the semiconductor laser stored in the red laser holder 2a to the outside of the red laser holder 2a. The recess 34 a secures a space for connecting the power supply terminal and a power supply line wired from the control board 22. In addition, although you may penetrate the recessed part 34a, in order to make the contact area of the red laser holder 2a and the fin 34 large, it is preferable to make it the minimum hollow without penetrating. By increasing the contact area, the red laser holder 2a can transfer heat to the fins 34 more effectively.

  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. The fin 35 is in contact with the tilt portion 30 and the side surface 201 b opposite to the side surface 201 a of the protrusion 201 that contacts the fixed surface 1 b of the green laser light source device 1. Therefore, the heat generated by the green laser light source device 1 is transferred to the fins 35 and the tilt unit 30. 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. In addition, although the projection part 201 and the fin 35 were made into the different body, in order to improve thermal conductivity, it is more preferable to integrate. By integrating, the green laser light source device 1 can easily dissipate heat.

  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 stage 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 each color laser light source device 1 to 3, but preferably maintains a temperature within 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.

  Therefore, the image display apparatus 10 according to the present embodiment faces the low step portion 36b and at least the spatial modulation element 9 so as not to actively cool the spatial modulation element 9 provided in the negative direction of the arrow X from the projection lens 4. It was set as the structure which does not contact the main body housing | casing 200 of a part. Thereby, it can suppress that the spatial modulation element 9 is cooled more than necessary.

  In addition, although the main body housing 200 and the fins 36 are separated, it is preferable that they are integrated in order 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.

  Further, the main body housing 200 and the fins 36 are also used for the heat radiation of the respective color laser light source devices 1 to 3. Since each color laser holder 1 a to 3 a is in contact with the main body casing 200, the heat generated by each color laser light source device 1 to 3 is transferred to the main body casing 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 with reference to FIG. FIG. 6 is a diagram illustrating an example of the cooling air path of the image display device according to the first embodiment of the present invention. 6 is also a view of FIG. 5 when viewed from the negative direction of the arrow Y.

  The cooling air passage is a path of air until the air sucked from the intake port 21a is exhausted from the exhaust ports 31a and 32a. The present embodiment includes first and second cooling air passages. The first cooling air passages are guided in the order of arrows A, B, C, D, and E, and are finally exhausted from the exhaust port 31a. The second cooling air passage is guided in the order of arrows A, B, and F, and finally exhausted from the exhaust port 32a. The cooling air cools the heat dissipating portions of the color laser light source devices 1 to 3 interposed between the two cooling air passages, so that the heat radiation of the color laser light source devices 1 to 3 is promoted. That is, the temperature rise of each color laser light source device 1 to 3 is suppressed. Hereinafter, these two cooling air paths will be described.

  As described above, the cooling fan 23 discharges cooling air in the direction of arrow A. This cooling air is guided in the direction of the fins 34 by the guide 24. Therefore, the cooling air path from the cooling fan 23 to the fins 34 is as shown by the arrow B, and the fins 34 are cooled.

  Here, the cooling air passage is branched into the direction of arrow C and the direction of arrow F. Here, the cooling air passage that proceeds in the direction of arrow C is the first branch passage, and the cooling air passage that advances in the direction of arrow F is the second branch passage. First, the case where the cooling air proceeds in the direction of arrow C (first branch path) will be described.

  Since the opening area of the first branch path is larger than the opening area of the second branch path, the cooling air is mainly guided in the direction of arrow C. Further, a guide 37 is provided in the tilt portion 30, and the guide 37 guides the cooling air guided in the direction of arrow C in the direction of arrow D. As a result, the cooling air reaches the fins 35 and cools the fins 35. The cooling air cools the blue laser light source device 3 provided between the projection lens 4 and the fins 35 and is discharged from the exhaust port 31a (in the direction of arrow E). As described above, the first cooling air passage is formed (in the order of arrows A, B, C, D, and E), and the cooling air absorbs the heat of the members interposed in the first cooling air passage.

  Next, the case where the cooling air proceeds in the direction of the arrow F (second branch path) will be described.

  The cooling air traveling in the direction of the arrow F is the cooling air guided to the exhaust port 32a and the remaining cooling air that has not advanced (in the direction of the arrow C) to the first branch path having a large opening area. This cooling air cools the fins 36 to promote heat dissipation of the main body casing 200. 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, D, and E, and the second cooling air passage is in the order of arrows A, B, and F. 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, the heat radiation portion (fin 35) of the green laser light source device 1, and the heat radiation portion (blue laser) of the blue laser light source device 3. The cooling air flowing in the order of the holders 3a) and flowing through the second cooling air passage cools the fins 36 (image display device main body 100). That is, the heat radiation of the color laser light source devices 1 to 3 is given priority in the order of the red laser light source device 2, the green laser light source device 1, and the blue laser light source device 3. Thereby, image quality degradation of the image display apparatus 10 can be suppressed.

  Hereinafter, the reason will be described in detail with reference to FIGS. FIG. 7 is a diagram showing the relationship between the temperature and the output of each color laser light source device in Example 1 of the present invention.

  First, the reason why the red laser light source device 2 radiates heat most preferentially will be described.

  The red laser light source device 2 generally has the worst temperature characteristics among the respective color laser light source devices 1 to 3. Here, the temperature characteristic means a characteristic indicating a temperature range in which a light output equal to or higher than the minimum required light output can be obtained in each color laser light source device 1 to 3. As shown in FIG. 7, the color laser light source devices 1 to 3 have different temperature characteristics. The outputs of the red laser light source device 2 and the blue laser light source device 3 decrease as the temperature increases. When the output of the green laser light source device 1 exceeds a predetermined temperature, it similarly decreases as the temperature increases. From the above, as the temperature of each color laser light source device 1 to 3 basically increases, the output thereof decreases, and among them, the output of the red laser light source device 2 particularly decreases. For this reason, it is preferable to preferentially suppress the temperature rise of the red laser light source device 2.

  Therefore, in this embodiment, the fin 34 is provided in the vicinity of the opening 38 of the image display apparatus main body 100. 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 introduced into the tilt unit 30 cools the fins 34 before cooling the fins 35 and the fins 36 and the blue laser holder 3a. 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 C and F. 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 decrease of the red laser light source device 2 having the worst temperature characteristics. Therefore, the image display apparatus main body 100 can stably output a high-quality image.

  Next, the reason why heat radiation of the green laser light source device 1 is given priority after the red laser light source device 2 will be described.

  Among the laser light source devices 1 to 3 of the respective colors, the green laser light source device 1 generally has the largest necessary current value. As described above, the green laser light source device 1 mainly outputs the green laser light by converting the infrared basic laser light into a half wavelength. 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, loss of light occurs, so that the efficiency of the green laser light source device 1 converting electricity into light is worse than that of the red laser light source device 2 and the blue laser light source device 3. That is, the green laser light source device 1 requires a larger amount of electric power than the red laser light source device 2 and the blue laser light source device 3 in order to produce a predetermined output amount. For this reason, the green laser light source device 1 generally has the largest heat generation amount among the respective color laser light source devices 1 to 3. Therefore, the heat generated by the green laser light source device 1 is transmitted to the protrusions 201 (that is, transmitted to the main body housing 200), and there is a possibility that the temperature of the red laser light source device 2 and the blue laser light source device 3 is increased. At this time, output reduction of the red laser light source device 2 and the blue laser light source device 3 is promoted.

  Therefore, in this embodiment, the image display device 10 is configured and the cooling air path is formed so as to cool the green laser light source device 1 in preference to the red laser light source device 2. 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 blue laser light source device 3. Also, one of the reasons that a lot of cooling air is guided toward the first branch path (in the direction of arrow C) is that the green laser light source device also wants to dissipate heat preferentially.

  Further, the image display device 10 is configured such that the heat of the green laser light source device 1 is not easily transmitted to other laser light source devices, particularly the red laser light source device 2. The green laser light source device 1 is in contact with the side surface 201a of the protrusion 201 and is fixed. On the other hand, as described above, a predetermined gap is provided between the green laser light source device 1 and the surface 202. Accordingly, the side surface 201 a where the green laser light source device 1 contacts the main body housing 200 and the surface 202 where the red laser light source device 2 contacts the main body housing 200 are different surfaces. That is, the image display apparatus main body 100 of the present embodiment is configured to increase the distance between the contact surfaces of the red laser light source device 2 and the main body housing 200 and the contact surfaces of the green laser light source device 1 and the main body housing 200. Thereby, it is possible to make it difficult for heat generated by the green laser light source device 1 to be transmitted to the red laser light source device 2, and a reduction in output of the red laser light source device 2 is suppressed.

  Further, the protruding portion 201 is provided integrally with the corner portion of the main body housing 200, and the fin 35 is provided in contact with the side surface 201 b opposite to the side surface 201 a in contact with the fixed surface 1 b of the green laser light source device 1. That is, the heat generated by the green laser light source device 1 is easily transmitted to the fins 35 through the side surface 201b having the widest area in the protrusion 201. For this reason, heat generated by the green laser light source device 1 is mainly transmitted to the fins 35. That is, the green laser light source device 1 performs heat radiation mainly using the fins 35. Therefore, the heat of the green laser light source device 1 is suppressed from being transmitted to the red laser light source device 2, and the temperature rise of the red laser light source device 2 is suppressed. Therefore, the red laser light source device 2 can output stably.

  In addition, when it is desired to thoroughly dissipate the heat of the green laser light source device 1 with the fins 35, in other words, when it is not desired to transmit the heat generated by the green laser light source device 1 to the red laser light source device 2 as much as possible, It is preferable to be a separate member from the housing 200 or to be separated from the main body housing 200. Thereby, the heat of the green laser light source device 1 is hardly transmitted to the main body housing 200. That is, the heat of the green laser light source device 1 is more difficult to be transmitted to the red laser light source device 2. If the protrusion 201 is separated from the main body housing 200, the protrusion 201 may be fixed to the tilt unit 30, for example.

  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 portion (such as a semiconductor laser that outputs infrared basic laser light) in the green laser light source device 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, and is transmitted to the protrusion 201 through the fixed surface 1b and the side surface 201a. The heat transmitted to the protrusion 201 is transmitted to the fins 35 through the side surface 201 b and also transmitted to the inside of the main body housing 200. Since the fin 35 is provided on the cooling air passage, the heat transmitted to the fin 35 is absorbed by the cooling air and radiated to the tilt portion 30. 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 absorbed by the cooling air and radiated to the tilt unit 30.

  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 transmitted to the red laser holder 2 a is transmitted to the fins 34 and also to the main body housing 200. Since the fin 34 is provided on the cooling air passage, the heat transmitted to the fin 34 is absorbed by the cooling air. Further, the heat of the fin 34 is radiated to the tilt part 30. Further, the heat transmitted to the main body casing 200 for the same reason as described above is transmitted to the fins 36, and this heat is absorbed by the cooling air and also radiated to the tilt portion 30.

  The heat generated by the heat generating portion (such as a semiconductor laser that outputs blue laser light) in the blue laser light source device 3 is first transmitted to the blue laser holder 3a. Since the blue laser holder 3a is provided on the cooling air passage, the heat transmitted to the blue laser holder 3a is absorbed by the cooling air. Further, the heat transmitted to the blue laser holder 3 a is transmitted to the main body housing 200. The heat transferred to the main body casing 200 for the same reason as described above is transferred to the fin 36, and this heat is absorbed by the cooling air.

  As described above, each color laser light source device 1 to 3 has a plurality of heat radiation paths, and members on these heat radiation paths are substantially heat radiation portions of the respective color laser light source devices 1 to 3. Each of the color laser light source devices 1 to 3 has a heat radiation path in addition to a heat radiation portion that mainly radiates heat (for example, fins 34 and 35 provided on the cooling air path, blue laser holder 3a, etc.) and dissipates heat. Thereby, each color laser light source device 1-3 has improved heat dissipation. For example, the red laser light source device 2 radiates heat using not only the fins 34 but also the main body housing 200 and the tilt unit 30. Similarly, the green laser light source device 1 and the blue laser light source device 3 also radiate heat using the main body housing 200 and the tilt unit 30. Further, the heat of the main body casing 200 is radiated by the fins 36.

  As described above, the image display apparatus 10 according to the present embodiment is configured in consideration of the temperature characteristics and the heat generation amount of the respective color laser light source apparatuses 1 to 3 and forms a cooling air passage. For this reason, image quality deterioration of the image display apparatus 10 due to long-time use is suppressed. That is, the image display device 10 can stably output a high-quality image.

  Of course, the blue laser holder 3a may be provided with a fin, or another fin other than the fin 35 may be provided in the negative direction of the arrow Z of the green laser holder 1a. The fins 34 to 36 do not have to be in contact with the tilt portion 30, and the structure of the fins 34 to 36 may be a sword mountain shape or a hierarchical shape, and is not particularly limited. In the present embodiment, the cooling air passage is branched into the first branch passage and the second branch passage by the fins 34, but this branching is performed upstream of the fins 34 from the fins 34 of the cooling air passage. It may be performed downstream. The tilt unit 30 may be integrated with the main body housing 200.

  Next, the point which is excellent in size reduction of the image display apparatus 10 is demonstrated using FIG. FIG. 8 is a diagram when the casing 11 of the image display apparatus 10 according to the first embodiment of the present invention is identified into three regions S, T, and U. FIG. 8 is also a view of the image display device 10 as viewed from the negative direction of the arrow Y as in FIG.

  As shown in FIG. 8, the housing 11 is identified as a region S (first region), a region T (second region), and a region U (third region). At this time, the fixing unit 20 is identified by the regions S and U, and the housing 11 in the region T is the tilt unit 30. Therefore, the region T can be tilted.

  The image display device 10 is formed in a size that can be stored in a restricted space (for example, a space in which the optical disk drive device of the PC 300 is stored). Thereby, the image display apparatus 10 can be mounted on the PC 300. When the image display device 10 is not used, the image display device 10 is inserted into the drive of the PC 300 from the opposite side of the side surface 32 and stored. When the image display device 10 is used, the image display device 10 protrudes from the PC 300. At this time, at least a part of the region S is stored and held in the PC 300.

  The control board 22 is electrically connected to the PC 300, the image display device main body 100 (each color laser light source device 1 to 3, the PBS 8, the spatial modulation element 9, etc.) and the cooling fan 23. As a result, the image display apparatus main body 100 and the cooling fan 23 are supplied with power from the PC 300 via the control board 22, and the image display apparatus main body 100 can project an image on the display of the PC 300 via the control board 22. Therefore, the image display apparatus 10 can project an image on the display of the PC 300 without making a wired connection outside the PC 300.

  Hereinafter, the case where the image display apparatus 10 is used by protruding from the PC 300 will be described.

  Even when the image display device 10 is used, at least a part of the region S is held in the PC 300. Thereby, the image display apparatus 10 is fixed to the PC 300 even when in use, and the installation surface of the PC 300 and the fixing unit 20 can be kept parallel. That is, the inclination of the image projected by the image display device 10 with respect to the installation surface of the PC 300 is suppressed. In the image display device 10, the region S is located closest to the PC 300. For this reason, a part of the control board 22 is arranged in the region S, and the control board 22 and the PC 300 can be easily electrically connected.

  The region T is located in the positive direction of the arrow Z of the region S (the opposite side of the PC 300 across the region S). For this reason, the area T for storing the image display apparatus main body 100 protrudes from the PC 300 when the image display apparatus 10 is used. Therefore, there is no obstacle in the positive and negative directions of the arrow Y in the region T (tilt part 30). For this reason, the region T (tilt unit 30) can be rotated in a direction perpendicular to the direction in which the image is projected. Further, the projection port 33 is located outside the PC 300 when in use. For this reason, the image display apparatus main body 100 can project an image from the projection port 33. Further, the projection port 33 is provided closer to the side surface 32 than the region S in the region T. In other words, the projection port 33 is provided closer to the counter electrode surface of the surface of the housing 11 than the region S. Thereby, the projection port 33 and PC300 are kept away. Therefore, it is possible to suppress the shadow of the PC 300 from entering the image projected from the projection port 33.

  The region U is located in the positive direction of the arrow Z of the region S (on the opposite side of the PC 300 across the region S) and is located in the negative direction of the arrow X of the region T (opposite the projection port 33 of the region T). The region U is a portion that completely protrudes from the PC 300 in the fixed portion 20. That is, since the cooling fan 23 and the intake port 21a are located outside the PC 300, the cooling fan 23 can intake air outside the image display device 10 from the intake port 21a. The cooling fan 23 is disposed closer to the side surface 32 than the region S in the region U. In other words, the cooling fan 23 is provided closer to the counter electrode surface of the surface of the housing 11 on the electric device side than the region S. Therefore, a space is generated between the cooling fan 23 and the region S in the region U. Therefore, a part of the control board 22 can be arranged using this space, and the control board 22 is arranged as a single board across the region S and the region U.

  As described above, by arranging the members in the regions S, T, and U, the image display device 10 can be reduced in size so that it can be stored in a restricted space. Only the region T (tilt unit 30) can be rotated, and the image display apparatus main body 100 is stored in this region T. The region U located in the negative direction of the arrow X of the region T is adjacent to the region T, and a hinge portion 25 is provided at the boundary between the region T and the region U, and the region T rotates about the hinge portion 25 as an axis.

  On the other hand, since both the region S and the region U are the fixed portions 20, the region S and the region U are not separated from each other, and either one is not inclined. Therefore, it is possible to dispose a single control board 22 that is a plane across the region S and the region U. By arranging the control board 22 in different regions, the space in the housing 11 can be effectively utilized.

  Furthermore, since the control board 22 is located in the region U, the distance from the cooling fan 23 arranged in the same region U can be reduced. That is, the control board 22 and the cooling fan 23 can be easily electrically connected. Further, the control board 22 exists in two directions of the region T (a negative direction of the arrow X and a negative direction of the arrow Z). In other words, the control board 22 is arranged so as to cover one corner in the region T. Therefore, the control board 22 can easily be wired to the image display apparatus main body 100 across the boundary between the region S and the region T, or easily across the boundary between the region U and the region T. However, when the tilt unit 30 is rotated, since the tilt unit 30 is separated from the adjacent surface of the region S, it is desirable to wire the image display device main body 100 across the boundary between the region U and the region T.

  Further, as described above, since the heat generated by each color laser light source device 1 to 3 is dissipated, the heat generated by the image display device 10 is transmitted to the PC 300 and can be prevented from adversely affecting the PC 300.

  Note that the positions of the region T and the region U may be reversed, and the configurations of the region T and the region U may be reversed to the left and right. That is, the projection port 33 is provided on the opposite side of the present embodiment, and the image display device 10 can project in the direction opposite to the projection direction shown in FIG.

  Hereinafter, a configuration different from the image display device 10 shown in FIGS. 6 and 8 will be described with reference to FIG. FIG. 9 is a diagram illustrating an example of a cooling air path of the image display device according to the first embodiment of the present invention.

  Differences between the image display device 10 shown in FIGS. 6 and 8 and the image display device 10 shown in FIG. 9 are the arrangement position of the cooling fan 23, the arrangement and configuration of the control board, and the arrangement and structure of the fins. Hereinafter, these different points will be described.

  As shown in FIG. 9, the cooling fan 23 is provided in the direction opposite to the arrow X from the opening 38, and discharges the cooling air in the direction of the arrow G. For this reason, in the image display apparatus 10 shown in FIG. 9, the guide 24 is not provided, and the cooling air from the cooling fan 23 directly cools the fins 34. Although not shown, an air inlet 21 a is provided on the upper surface 21 of the fixing portion 20 in the positive direction of the arrow Y from the cooling fan 23.

  In the image display device 10 shown in FIG. 9, the control board 22 is not a single board but is divided into two boards (a control board 22a and a control board 22b). The control board 22a and the control board 22b are different from each other. The cooling fan 23 and the fixed part 20 are electrically connected. That is, the control board 22a and the control board 22b are physically two boards, but are electrically one board. Accordingly, the separated control board 22b is supplied with electric power from the electric device such as the PC 300 via the control board 22a. As described above, since the control board 22 is electrically one board, the image display apparatus 10 shown in FIG. 9 is similar to the image display apparatus 10 shown in FIGS. S and the region U are arranged across.

  The fin 39 is in contact with the red laser holder 2a. That is, it is a heat radiating part of the red laser light source device 2 like the fins 34. As shown in FIG. 9, the fin 39 has a smaller structure than the fin 34. In the image display device 10 shown in FIG. 9, the fins 40 are provided by using a space generated by arranging the fins 39 instead of the fins 34. The fin 40 is in contact with the tilt unit 30. Further, the fin 39 has a recess 39 a similar to the recess 34 a of the fin 34.

  The fins 39 have a hierarchical structure for widening the surface area for heat dissipation. Furthermore, the fin 39 has a guide 39b indicated by a dotted line in FIG. Similarly, the fin 40 has a hierarchical structure for increasing the surface area, and has a guide 40a indicated by a dotted line in FIG. 9 in an internal hierarchy in order to form a cooling air passage.

  Since the image display apparatus 10 shown in FIG. 9 is configured as described above, the cooling air discharged from the cooling fan 23 in the direction of the arrow G travels mainly in the linear extension direction of the arrow G (first branch path). At the same time, at least a part thereof is branched in the direction of arrow F (second branch path). At least a part of the cooling air that has advanced in the linearly extending direction of the arrow G is guided in the direction of the arrow H by the guide 39b. Thereby, the cooling air guided in the direction of the arrow H merges with the cooling air that flows linearly from the cooling fan 23 and is guided in the direction of the guide 40a. Therefore, the cooling air guided to the guide 40a is guided in the direction of arrow I. Thereby, this cooling air cools the heat radiation part of the green laser light source device 1 and the blue laser light source device 3, and is exhausted from the exhaust port 31a. On the other hand, the cooling air that has advanced in the direction of arrow F cools the fin 36 and is exhausted from the exhaust port 32a. Since the cooling air path is formed as described above, the image display device 10 shown in FIG. 9 obtains the same effect as the image display device 10 shown in FIGS.

  Further, as described with reference to FIGS. 6 and 8, the heat generated by the laser light source devices 1 to 3 is finally transmitted to the tilt unit 30. The fin 40 is not in contact with each color laser light source device 1 to 3 and receives a lot of cooling air. Therefore, the fin 40 can keep low temperature. That is, in the configuration of the image display device 10 illustrated in FIG. 9, heat can be further radiated from the tilt unit 30 to the fins 40. Thereby, the heat dissipation of an image display apparatus can be improved.

  Furthermore, in the case of the configuration of the image display device 10 shown in FIG. 9, it is possible to send air directly into the tilt unit 30 without the need for the guide 24. For this reason, the loss of the cooling air by the guide 24 (for example, the cooling air crawling in the fixed portion 20 without going to the tilt portion 30) hardly occurs. Therefore, the cooling air can be sent to the tilt part 30 more reliably.

  Further, the configuration of the image display device 10 shown in FIG. 9 is different from the configuration of the image display device 10 shown in FIGS. 6 and 8, and the cooling air discharged from the cooling fan 23 tilts without passing over the control board 22. Part 30 is sent. That is, in this embodiment, the fins 39 are cooled without absorbing the heat generated in the control board 22. Thereby, the fins 39 and 40 can be cooled more effectively.

  Next, angle regulation of the tilt unit 30 will be described with reference to FIG. FIG. 10 is a diagram illustrating a cross section of the image display apparatus according to the first embodiment of the present invention. FIG. 10 is also a view when the JJ cross section of FIG. 6 is viewed from the positive direction of the arrow Z.

  As described above, the hinge portion 25 is a rotation shaft between the tilt portion 30 and the fixed portion 20. In this embodiment, the hinge portion 25 is provided in the tilt portion 30, but the hinge portion 25 may be provided in the fixed portion 20. The tilt unit 30 stores the image display apparatus main body 100 and has a projection port 33. Therefore, the projection angle of the image display device 10 can be changed by rotating the tilt unit 30. Further, the point that deterioration of image quality can be suppressed by restricting the rotation angle θ will be described in detail.

  In the following description, in order to explain the angle restriction of the tilt part 30 in detail, the opening part 38 for sending cooling air from the fixed part 20 to the tilt part 30 is divided into an upstream opening part 38a and a downstream opening part 38b. I will explain.

  First, each member and its relationship will be described.

  The inner side surface 41 is a side surface of the fixed portion 20, and the inner side surface 42 is a side surface of the tilt portion 30. When the tilt portion 30 is not rotated, the inner side surface 41 and the inner side surface 42 are adjacent to each other, but the inner side surface 42 is further away from the inner side surface 41 as the tilt portion 30 is tilted from the fixed portion 20.

  The upstream opening 38a is an opening provided on the inner side surface 41 of the fixed portion 20 on the cooling air passage. The cooling air from the cooling fan 23 is guided in the direction of arrow B as shown in FIGS. The cooling air passes through the upstream opening 38 a and travels toward the tilt portion 30.

  The downstream opening 38b is an opening provided on the inner surface 42 of the tilt portion 30 on the cooling air passage, and is located downstream of the upstream opening 38a in the cooling air passage. The cooling air that has passed through the upstream opening 38a further passes through the downstream opening 38b. Thereby, the cooling air is sent to the tilt unit 30. And cooling air absorbs the heat in the tilt part 30, and is discharged | emitted from the exhaust ports 31a and 32a.

  The rotation angle θ is an inclination angle from the fixed portion 20 of the tilt portion 30, and is an angle formed by a straight line KK and a straight line LL as shown in FIG. The straight line KK is a straight line in the negative direction of the arrow Y from the central axis of the hinge portion 25, and the straight line LL is a perpendicular to the bottom side of the inner side surface 42 from the central axis of the hinge portion 25. In this embodiment, the inner side surface 41 and the inner side surface 42 are planes (in other words, the inner side surface 41 and the straight line KK are parallel to each other, and the inner side surface 42 and the straight line LL are parallel to each other. Therefore, the rotation angle θ is also an angle formed by the inner side surface 41 and the inner side surface 42. Further, the rotation angle θ is also an angle formed by an arrow B and an arrow C in FIG. In the present embodiment, the bottom surface 43 and the bottom surface 44 are flat surfaces. Accordingly, the straight line KK is perpendicular to the plane including the bottom surface 43 of the fixed portion 20 from the central axis of the hinge portion 25, and the straight line LL is a plane including the bottom surface 44 of the tilt portion 30 from the central axis of the hinge portion 25. It is also the angle formed by the perpendicular to. Further, the rotation angle θ is also an angle formed by the bottom surface 43 of the fixed portion 20 and the bottom surface 44 of the tilt portion 30.

  Hereinafter, when the rotation angle θ = 0 (that is, when the inner side surface 41 and the inner side surface 42 are parallel) is set as non-rotation time, and when the rotation angle θ ≠ 0 (that is, the inner side surface 41 and the inner side surface 41 are The time when the side surface 42 is not parallel is defined as the time of rotation. At this time, the rotation angle θ is also an angle formed by the projection direction at the time of rotation and the projection direction at the time of non-rotation. That is, this angle is a projection angle, and in this embodiment, the rotation angle θ and the projection angle are the same. As shown in FIG. 4, when the image display apparatus 10 is mounted on the PC 300, the rotation angle θ is also an angle formed by the installation surface of the PC 300 and the projection direction.

  Next, the height H1, the height h2, and the rotation height y will be described with reference to FIGS. FIG. 11 is a diagram for explaining the relationship between the height of the tilt portion and the fixed portion of the image display device according to the first embodiment of the present invention. FIG. 11A is a view of the cross section when the image display device 10 of FIG. 10 is cut along a straight line KK when viewed from the negative direction of the arrow X. FIG. FIG. 11B is a view when a cross section of the image display device 10 of FIG. 10 taken along a straight line KK is viewed from the positive direction of the arrow X. That is, FIG. 11A shows a vertical cross section of the fixed portion 20, and FIG. 11B shows a vertical cross section of the tilt portion 30. However, FIG. 11A and FIG. 11B do not show the entire cross section of the image display device 10. FIG. 11A shows only the periphery of the upstream opening 38 a in the fixed portion 20, and FIG. 11B shows only the periphery of the downstream opening 38 b in the tilt portion 30. In addition, FIG. 11 shows the cross section at the time of rotation.

  38c is the bottom of the upstream opening 38a, and 38d is the bottom of the downstream opening 38b.

  First, the upstream opening 38a in the present embodiment will be described in detail. The upstream opening 38a is a part of the opening provided in the inner side surface 41, and the remaining opening except the part is closed by the base 26 as shown in FIG. Therefore, the bottom side 38c of the upstream opening 38a is at the position shown in FIG. That is, the base 38c and the cooling fan installation surface (upper surface of the base 26) in the present embodiment are on the same plane. Since the upstream opening 38a is formed as described above, it is preferable that the surface on the tilt portion 30 side of the pedestal 26 and the inner side surface 41 are on the same plane. This is to prevent the cooling air from leaking from between the pedestal 26 and the opening provided in the inner side surface 41. Needless to say, only the upstream opening 38a may be opened in the inner side surface 41.

  The height H1, the height h2, and the rotation height y are the heights in the arrow Y direction from the reference plane 51. The reference plane 51 is a plane that includes the lowest point of the downstream opening 38b at the time of non-rotation (a point that is located closest to the negative direction of the arrow Y) and intersects the arrow Y perpendicularly. In the case of the present embodiment, since the downstream opening 38b is polygonal (it may be circular or oval, and the shape is not particularly limited), the lowest point of the downstream opening 38b is located on the bottom 38d. Since FIG. 11 shows a cross section during rotation as described above, the height in the arrow Y direction of the fixing portion 20 shown in FIG. 11A and the tilt portion 30 shown in FIG. In this embodiment, the height (length in the arrow Y direction) of the fixed portion 20 and the tilt portion 30 when not rotating is the same.

  Hereinafter, the relationship between the heights of the fixed unit 20 and the tilt unit 30 will be described.

  The reference plane 52 is a plane that includes the lowest point of the downstream opening 38b during rotation and intersects the arrow Y perpendicularly. That is, the position of the reference plane 52 is variable, and the position of the reference plane 52 moves in the positive direction of the arrow Y as the rotation angle θ increases.

  The rotational height y is a vertical distance between the reference height 51 and the reference height 52 described above. In other words, the rotation height y is the movement distance in the positive direction of the arrow Y at the lowest point of the downstream opening 38 b generated by rotating the tilt portion 30.

  The reference plane 53 is a plane that includes the lowest point of the upstream opening 38a and intersects the arrow Y perpendicularly. In the case of the present embodiment, since the upstream opening 38a is polygonal, the lowest point of the upstream opening 38a is located on the bottom 38c. In the present embodiment, the lowest point of the upstream opening 38 a is also located on a plane including the installation surface of the cooling fan 23. That is, the lowest point of the upstream opening 38 a is also located on a plane including the upper surface of the pedestal 26.

  The height h2 is a vertical distance between the reference plane 51 and the reference plane 53 described above. In the case of the present embodiment, the height h2 is also the height of the pedestal 26 in the arrow Y direction.

  The reference plane 54 is a plane that includes the central axis of the hinge portion 25. That is, the reference plane 54 intersects the arrow Y perpendicularly like the reference planes 51 to 53.

  The height H1 is a vertical distance between the reference plane 51 and the reference plane 54 described above.

  From the above description and FIGS. 10 and 11, the vertical distance between the reference plane 52 and the reference plane 54 is H1 cos θ. Therefore, the vertical distance between the reference plane 52 and the reference plane 54 decreases as the rotation angle θ increases.

  As shown in FIG. 11, the rotation height y is also the difference between the vertical distance between the reference plane 51 and the reference plane 54 and the vertical distance between the reference plane 52 and the reference plane 54. Therefore, the rotational height y = H1−H1cos θ = H1 (1−cos θ).

  In this embodiment, the rotational height y is configured to satisfy the following relationship (Equation 1).

y = H1 (1-cos θ) ≦ h2 (Equation 1)
That is, the rotation angle θ is controlled so that the rotation height y is always smaller than the height h2.

  If the maximum value of the rotation angle θ is the maximum rotation angle θmax, the rotation angle θ is controlled so that 0 ≦ θ ≦ θmax (when rotating from the straight line KK to the straight line LL). Is positive). The maximum rotation angle θmax is the rotation angle θ when the rotation height y = the height h2. That is, the reference plane 52 and the reference plane 53 are the same plane, and the lowest point of the upstream opening 38a and the lowest point of the downstream opening 38b are located on the same plane.

  By controlling the rotation angle θ so that 0 ≦ θ ≦ θmax, image quality deterioration of the image display device 10 can be suppressed. Hereinafter, this reason will be described. The method for controlling the rotation angle θ may be performed mechanically, electronically, or using software, and is not particularly limited.

  As described above, the cooling fan 23 is provided on the base 26 of the fixed portion 20. The cooling air discharged from the cooling fan 23 passes through the upstream opening 38 a and the downstream opening 38 b in this order, and is sent to the tilt unit 30. As shown in FIG. 10, the cooling air from the cooling fan 23 travels in the linear extension direction indicated by the arrow B, and enters the tilt portion 30 through the downstream opening 38b located in the linear extension direction.

  The problem here is that the cooling air is less likely to be sent from the fixed portion 20 to the tilt portion 30 as the rotation angle θ is increased. As the rotation angle θ increases, the distance between the bottom surface 43 and the bottom surface 44 increases, and the gap generated between the fixed portion 20 and the tilt portion 30 increases. As a result, the cooling air from the fixed unit 20 toward the tilt unit 30 is more likely to leak outside the image display device 10. For example, if the rotation angle θ = 90 degrees, the tilt portion 30 does not exist in the linear extension direction of the arrow B, so that the cooling air almost leaks to the outside. Further, since the lowest point of the upstream opening 38a is closest to the gap formed between the fixed part 20 and the tilt part 30 in the upstream opening 38a, the cooling exhausted from the lowest point of the upstream opening 38a. Air is particularly likely to leak from a gap formed between the fixed portion 20 and the tilt portion 30.

  Therefore, the hinge portion 25 in this embodiment is controlled so as to always satisfy the relationship of 0 ≦ θ ≦ θmax. That is, the reference plane 52 does not become higher than the reference plane 53 (not in the positive direction of the arrow Y). In other words, the base 38d (including the lowest point of the downstream opening 38b) is not positioned higher than the base 38c (including the lowest point of the upstream opening 38a) (the position in the positive direction of the arrow Y). Therefore, the downstream opening 38b exists in the vertical direction of the upstream opening 38a (inner surface 41) from the lowest point of the upstream opening 38a. In other words, the upstream opening 38a does not exist in the vertical direction of the downstream opening 38b (inner surface 42) from the lowest point of the downstream opening 38b.

  By controlling the rotation angle θ as described above, the cooling air path between the lowest point of the upstream opening 38a and the downstream opening 38b is connected by a straight line parallel to the arrow X even during rotation. be able to. For this reason, it is possible to prevent the cooling air flowing in the positive direction of the arrow X from the lowest point of the upstream opening 38 a from leaking out of the image display device 10.

  Therefore, the cooling air can be more reliably sent from the upstream opening 38a to the downstream opening 38b. Therefore, a cooling air path can be formed between the intake port 21a and the exhaust ports 31a and 32a, and the image display device main body 100 in the tilt portion 30 can be more effectively cooled. Thereby, the temperature rise of each color laser light source apparatus 1-3 is suppressed. Therefore, image quality deterioration of the image display device 10 can be suppressed. Further, as described above, the image display device 10 is configured to be preferentially cooled in the order of the red laser light source device 2, the green laser light source device 1, and the blue laser light source device 3, so that the image quality deterioration is stably performed for a long time. Can be suppressed.

  Furthermore, in this embodiment, the area of the vertical section as shown in FIG. 11B of the downstream opening 38b during rotation is larger than the area of the upstream opening 38a. The projection in the vertical direction of the upstream opening 38a from the downstream opening 38b (the negative projection of the arrow X from the downstream opening 38b) includes the upstream opening 38a. That is, the downstream opening 38b exists in the linear extension direction of the arrow B of the cooling air from the upstream opening 38a even during rotation. Therefore, the cooling air path between the upstream opening 38a and the downstream opening 38b can be formed linearly. As described above, even if a guide such as a bellows is not provided between the upstream opening 38a and the downstream opening 38b, the cooling air can be sent from the upstream opening 38a to the downstream opening 38b. Therefore, the image display device 10 can stably suppress deterioration in image quality for a long time. In this embodiment, the linear extension direction of the arrow B and the positive direction of the arrow X are the same.

  In the present embodiment, the cooling fan 23 and the upstream opening 38a have the same height. In other words, the installation surface of the cooling fan 23 and the bottom side 38c of the upstream opening 38a are located on the same plane (this plane intersects perpendicularly to the arrow Y). Thereby, the image display device 10 is configured such that the cooling air from the cooling fan 23 flows smoothly to the upstream opening 38a. Even if the cooling fan 23 and the upstream opening 38a are not provided at the same height, a guide may be provided so that the cooling air from the cooling fan 23 flows to the upstream opening 38a.

  Further, the image display device 10 of the present embodiment is configured such that the upstream opening 38a is provided at a position closer to the upper surface 21 (or the hinge portion 25) than the bottom surface 43 of the fixing unit 20. Thereby, compared with the case where the base 26 is not provided in the fixing | fixed part 20, the base 38c (reference plane 53) of the upstream opening part 38a can be provided in a high position. That is, the distance of the height h <b> 2 can be increased as compared with the case where the pedestal 26 is not provided on the fixed portion 20. As described above, the reference plane 52 moves in the positive direction of the arrow Y as the tilt portion 30 rotates about the hinge portion 25 as an axis. For this reason, by providing the base 38c (reference plane 53) of the upstream opening 38a at a high position, the range of the rotation angle θ satisfying the relationship of (Equation 1) can be increased. That is, the maximum rotation angle θmax can be increased while ensuring a cooling air path between the fixed portion 20 and the tilt portion 30. Therefore, the changeable range of the projection direction of the image display device 10 can be increased.

  The image display device 10 in the present embodiment is configured such that the bottom surface 43 and the bottom surface 44 are on the same plane, but this is not restrictive. For example, the length of the fixed portion 20 in the arrow Y direction is made shorter than the length of the tilt portion 30 in the arrow Y direction, thereby increasing the height of the reference plane 53 without providing the base 26 (indicated by the arrow Y). In the positive direction). In order to increase the distance of the height h2, it is preferable to make the bottom side 38d of the downstream opening 38b as low as possible (in the negative direction of the arrow Y). This is because the maximum rotation angle θmax can be increased while ensuring a cooling air path between the fixed portion 20 and the tilt portion 30.

  In the present embodiment, a part of the control board 22 is located on the cooling air passage, but it is preferable not to provide the control board 22 on the cooling air passage in order to intensively cool the image display apparatus main body 100. This is to prevent the cooling air from the cooling fan 23 from absorbing the heat of the control board 22. By suppressing heat absorption from the control board 22 of the cooling air, cooling air having a lower temperature is sent to the tilt unit 30. For this reason, the image display apparatus main body 100 can be cooled more effectively.

  In order to realize the above, for example, the hierarchy of the cooling fan 23 and the hierarchy of the control board 22 may be shifted. Here, the hierarchy is a plane perpendicular to the arrow Y. Therefore, the control board 22 may not be provided in the positive / negative direction of the arrow X and the positive / negative direction of the arrow Z from the cooling fan 23. When applied to FIG. 10 in the present embodiment, the control board 22 may be on the same level as the base 26. Thereby, it can be set as the structure which does not provide the control board 22 on a cooling air path, ensuring the present magnitude | size of the control board 22. FIG. The cooling air is suppressed from absorbing heat by the control board 22, and the image display apparatus main body 100 can be cooled by cooling air having a lower temperature. That is, image quality deterioration of the image display device 10 is further suppressed. Note that the level of only the control board 22 positioned on the cooling air path may be shifted.

  In the present embodiment, the hinge portion 25 is provided closer to the upper surface 21 than the bottom surface 43 (or the bottom surface 44). As a result, the image display device 10 can be configured not to contact the fixed unit 20 even when the tilt unit 30 rotates. For example, when the hinge portion 25 is provided at a position having the same distance as the upper surface 21 and the bottom surface 43, the inner side surface 42 existing in the positive direction of the arrow Y with respect to the hinge portion 25 is rotated by the tilt portion 30. Move in the negative direction of X. For this reason, it is necessary for the fixing portion 20 to be provided with a recess for securing a space for the movement of the tilt portion 30 during the rotation. If the concave portion is provided in the fixing portion 20, the fixing portion 20 may be enlarged because the concave portion where a member cannot be provided is required. As described above, in order to reduce the size of the image display device 10, it is preferable to provide the hinge portion 25 on the upper surface 21 side rather than the bottom surface 43 (or the bottom surface 44).

  In the present embodiment, the method of controlling the rotation angle θ has been described using the cross section of the image display device 10 shown in FIG. 6. However, the image display device 10 having the configuration shown in FIG. Needless to say, the control method may be applied.

(Example 2)
A second embodiment of the present invention will be described below with reference to FIG. FIG. 12 is a diagram illustrating a cross section of the image display device according to the second embodiment of the present invention. Here, members having the same configurations and functions as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, an example of a method for controlling the rotation angle θ will be described. In this embodiment, the rotation angle θ is mechanically controlled by the recess 45 and the protrusion 46. Similarly, in this embodiment, the rotation angle θ is controlled so that 0 ≦ θ ≦ θmax.

  As shown in FIG. 12, the concave portion 45 is provided in the fixed portion 20, and the protruding portion 46 is provided around the hinge portion 25 of the tilt portion 30. As the tilt part 30 rotates, the protrusion 46 also moves in the rotation direction. Then, the protrusion 46 passes through the recess 45 and comes into contact with the fixed part 20, whereby the rotation of the tilt part 30 is restricted. That is, the rotation angle θ when the protruding portion 46 contacts the fixed portion 20 is the maximum rotation angle θmax. In other words, the image display device 10 is configured such that the reference plane 52 and the reference plane 53 are the same plane when the protruding portion 46 contacts the fixed portion 20.

  As described above, the rotation angle θ is controlled so that 0 ≦ θ ≦ θmax, so that the cooling air path between the lowest point of the upstream opening 38a and the downstream opening 38b even during rotation. Can be connected by a straight line parallel to the arrow X. For this reason, it is possible to prevent the cooling air flowing in the positive direction of the arrow X from the lowest point of the upstream opening 38 a from leaking out of the image display device 10.

  Therefore, the cooling air can be more reliably sent from the upstream opening 38a to the downstream opening 38b. Therefore, a cooling air path can be formed between the intake port 21a and the exhaust ports 31a and 32a, and the image display device main body 100 in the tilt portion 30 can be more effectively cooled. Thereby, the temperature rise of each color laser light source apparatus 1-3 is suppressed. Therefore, image quality deterioration of the image display device 10 can be suppressed. Furthermore, since the image display device 10 is configured to be preferentially cooled in the order of the red laser light source device 2, the green laser light source device 1, and the blue laser light source device 3 as in the first embodiment, it is stable for a long time. Thus, image quality deterioration can be suppressed.

  Note that the housing 11 of the image display device 10 (including the fixing unit 20 and the tilt unit 30) preferably has a shape with less unevenness. This is for facilitating the mounting of the image display device 10 on an electronic device (for example, the PC 300 or the like) in which the space for mounting is limited.

  From the above, it is preferable that the upper surface 21 of the fixed portion 20 and the upper surface of the tilt portion 30 exist on the same plane. That is, a configuration of the image display device 10 in which the protruding portion 46 does not protrude from the same plane is preferable. However, when the protruding portion 46 protrudes from the same plane as in the present embodiment, the protruding portion 46 may be configured to be housed in the image display device 10. Thereby, for example, the image display device 10 can be easily mounted on an electronic device such as the PC 300.

(Example 3)
A third embodiment of the present invention will be described below with reference to FIG. FIG. 13 is a diagram illustrating a cross section of the image display device according to the third embodiment of the present invention. Here, members having the same configurations and functions as those of the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, an example of a method for controlling the rotation angle θ will be described. In the present embodiment, the rotation angle θ is mechanically controlled by the sheet loading / unloading portion 47 and the sheet member 48. Similarly, in this embodiment, the rotation angle θ is controlled so that 0 ≦ θ ≦ θmax. In this embodiment, two sheet loading / unloading portions 47 are used, and the one provided in the fixing portion 20 is referred to as a sheet loading / unloading portion 47a, and the one provided in the tilt portion 30 is referred to as a sheet loading / unloading portion 47b.

  The sheet entry / exit part 47 a is provided in the fixed part 20, and the sheet entry / exit part 47 b is provided in the tilt part 30. In addition, the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b can wind (accommodate) a later-described sheet member 48 and can be pulled out. The sheet member 48 is connected to the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b. The length in which the sheet member 48 is accommodated in the sheet loading / unloading portion 47a or the sheet loading / unloading portion 47b varies depending on the distance between the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b. That is, the length of the sheet member 48 exposed to the outside of the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b varies.

  When the rotation angle θ is increased, the distance between the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b is gradually increased, and the sheet member 48 accommodated in the sheet loading / unloading portion 47a or the sheet loading / unloading portion 47b is moved to the sheet loading / unloading portion 47a or the sheet. It is pulled out of the entrance / exit 47b. On the other hand, when the rotation angle θ is decreased, the distance between the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b is reduced, and the sheet member 48 is accommodated in the sheet loading / unloading portion 47a or the sheet loading / unloading portion 47b.

  As described above, when the rotation angle θ is increased, the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b are separated from each other. For this reason, the sheet member 48 is pulled out from the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b. When all the sheet members 48 are pulled out from the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b, the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b cannot be separated from this state. That is, since the rotation angle θ cannot be increased, the rotation angle θ at this time becomes the maximum rotation angle θmax.

  As described above, the rotation angle θ is controlled so that 0 ≦ θ ≦ θmax, so that the cooling air path between the lowest point of the upstream opening 38a and the downstream opening 38b even during rotation. Can be connected by a straight line parallel to the arrow X. For this reason, it is possible to prevent the cooling air flowing in the positive direction of the arrow X from the lowest point of the upstream opening 38 a from leaking out of the image display device 10.

  Therefore, the cooling air can be more reliably sent from the upstream opening 38a to the downstream opening 38b. Therefore, a cooling air path can be formed between the intake port 21a and the exhaust ports 31a and 32a, and the image display device main body 100 in the tilt portion 30 can be more effectively cooled. Thereby, the temperature rise of each color laser light source apparatus 1-3 is suppressed. Therefore, image quality deterioration of the image display device 10 can be suppressed. Furthermore, since the image display device 10 is configured to be preferentially cooled in the order of the red laser light source device 2, the green laser light source device 1, and the blue laser light source device 3 as in the first embodiment, it is stable for a long time. Thus, image quality deterioration can be suppressed.

  In the present embodiment, the sheet loading / unloading portion 47 is provided in each of the fixing portion 20 and the tilting portion 30, but it is not always necessary to provide both. That is, the sheet loading / unloading portion 47 may be provided on either one. However, when the sheet loading / unloading portion 47 is provided in each of the fixed portion 20 and the tilting portion 30, the sheet member 48 may be accommodated by the two sheet loading / unloading portions 47, so that one sheet loading / unloading portion 47 can be made small.

  In the present embodiment, the sheet member 48 is stored in the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b. However, the image loading / unloading portion 47a and the sheet loading / unloading portion 47b may not be provided in the image display device 10. Although the sheet member 48 is held in a slack state in the image display device 10, the rotation angle θ can be controlled.

  Further, the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b of this embodiment have a length equivalent to the boundary portion between the region U and the region T shown in FIG. 8 (or FIG. 9). That is, the sheet member 48 accommodated in the sheet loading / unloading portion 47a and the sheet loading / unloading portion 47b also has a width equivalent to the boundary between the region U and the region T. In other words, this width is the length of the inner side surface 41 or the inner side surface 42 in the arrow Z direction. The sheet member 48 can fill a gap generated between the fixed portion 20 and the tilt portion 30 when the tilt portion 30 is tilted.

  Therefore, the sheet member 48 suppresses the cooling air sent from the fixed portion 20 to the tilt portion 30 from leaking from the gap. Therefore, it is possible to send the cooling air to the tilt portion more reliably. That is, the cooling of the image display device main body 100 (particularly, each color laser light source device 1 to 3) included in the tilt unit 30 can be more reliably promoted. Therefore, it is possible to suppress image quality deterioration due to a decrease in output of each color laser light source device 1 to 3 due to a temperature rise of each color laser light source device 1 to 3.

  In addition, Examples 1-3 can be combined suitably.

  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 11 Case 20 Fixing part 21 Upper surface 21a Inlet port 22, 22a, 22b Control board (control part)
23 Cooling fan (blower)
24 Guide 25 Hinge part 30 Tilt part 31, 32 Side face 31a, 32a Exhaust port 33 Projection port 34, 35, 36, 39, 40 Fin 34a, 39a Recessed part 36a High step part 36b Low step part 37, 39b, 40a Guide 38 Opening Portion 38a Upstream opening 38b Downstream opening 38c, 38d Bottom 41, 42 Inner side 43, 44 Bottom 45 Recess 46 Projection 47, 47a, 47b Sheet entry / exit 48 Sheet member 51, 52, 53, 54 Reference plane 100 Image display Device main body 200 Main body housing 201 Protruding portions 201a, 201b Side surface 202 Surface 300 PC

Claims (6)

An apparatus main body for forming and projecting an image using an output from the light source unit;
Cooling means for cooling at least the light source unit;
A first housing having a first opening for storing the cooling means and exhausting air from the cooling means;
And having a second opening for sucking the air exhausted from the first opening, a second housing for storing the device main body,
And a Ruhi Nji unit rotates the second housing from the first housing,
The tilt angle from the first housing to the second housing, the projection of the first vertical opening and the second opening is controlled so as to intersect,
Image display device. The image display device according to claim 1,
The image display apparatus, wherein the tilt angle is controlled so that a vertical projection of the first opening of the second opening includes the first opening. The image display device according to claim 1,
The second housing is rotatable to the upper surface side of the second housing,
The image display device , wherein the first opening is disposed closer to the top surface than the bottom surface of the second housing . An image display apparatus according to any one of claims 1 to 3,
The first housing further stores a control unit that controls the apparatus main body,
Said control unit, a non-placed in the cooling air path formed between said cooling means and said first opening, an image display device. An image display apparatus according to any one of claims 1 to 4,
Together provided in the hinge portion further has a protrusion that rotates together with the second housing,
When the vertical projection of the first opening from the lowest point of the first opening intersects with the lowest point of the second opening, the protrusion comes into contact with the first housing An image display device. The image display device according to any one of claims 1 to 5,
The position of the said 2nd opening part is an image display apparatus changed based on the said inclination angle.