JP2006084781A - Heating element holding unit, optical device and image projection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating element holding unit excellent in cooling efficiency and capable of reducing noise, and an optical device and an image projection apparatus. <P>SOLUTION: The heating element holding unit is provided with structure to hold a exhaust fan 18 in an optical box 6 holding a plurality of optical parts including a light source being a heat generating source. Then, apertures (76 to 79) for sucking 2nd air from the outside of the optical box 6 not air (1st air) from the light source are formed at a part on the inlet port side of the exhaust fan 18. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image projection apparatus (projector), and more particularly to exhaust heat in the image projection apparatus.

  Conventionally, in a liquid crystal projector, an ultra-high pressure mercury lamp, a UHB (Ultra High Brightness) lamp, or the like is used as a light source, and a high-output light source is configured. Since the lamp generates heat with light, various means for exhausting the heat from the liquid crystal projector have been proposed.

  Particularly in recent years, liquid crystal projectors have become increasingly brighter and smaller, and are easily affected by performance degradation due to heat generated inside the liquid crystal projector. Therefore, it is desired to develop a mechanism for efficiently discharging the heat in the liquid crystal projector to the outside.

Specifically, as described in Patent Document 1, a predetermined space is provided between the lamp house in which the light source is housed and the cooling fan in the housing, and an air path extending from the lamp house to the fan is provided in this space. By providing a partition plate that divides the air path leading from the inside of the housing to the fan, the cooling inside the lamp and the inside of the housing are simultaneously performed by one fan, and the heat dissipation inside the projector is enhanced.
Utility Model Registration No. 2569235 (paragraph 0019, FIG. 2, FIG. 4 etc.)

  However, in the above embodiment, the air flowing into the fan that exhausts heat passes through the light source, that is, the air path is changed from the light source to the fan, so the high-temperature air heated by the light source is exhausted as it is. As a result, members other than the light source such as the exterior member are heated. For this reason, the cooling efficiency is reduced. Furthermore, there is a possibility that the user feels uncomfortable due to the high-temperature air or the exterior member heated by the high-temperature air.

  Further, when the exhaust fan is increased in size or the output is increased in order to improve the cooling efficiency, noise due to motor drive noise or fan blade vibration is generated.

  In particular, when there is one air path for air flowing into the fan, there is a problem that the operating pressure of the fan increases and noise is generated due to vibration of the fan blades.

  An exemplary object of the present invention is to realize a heating element holding unit, an optical device, and an image projection device that have good cooling efficiency and reduced noise.

  A heating element holding unit as one aspect of the present invention includes a holding member that houses a heating element, and a fan that sucks the first air that is held by the holding member and cools the heating element from the inside of the holding member. The heating element holding unit is characterized in that an opening for sucking the second air from the outside of the holding member is formed in a portion of the unit on the side of the fan suction port.

  According to the present invention, the opening for sucking the second air from the outside of the holding member is formed in the portion of the heating element holding unit on the suction port side of the fan. Air is cooled. For this reason, the exhaust temperature of the fan decreases. Further, the exhaust from the fan can be used for cooling other parts. Therefore, the cooling effect is improved and the operating pressure of the fan can be appropriately maintained, so that noise is reduced.

  Examples of the present invention will be described below.

  FIG. 1 shows the configuration of an image projection apparatus (projector) that is Embodiment 1 of the present invention. In FIG. 1, 1 is a lamp unit, 2 is a lamp holder for holding the lamp unit 1, 3 is explosion-proof glass, and 4 is a glass retainer.

  α is an illumination optical system in which light from the lamp unit 1 is incident, and β is a color separation / synthesis optical system that color-separates the emitted light from the illumination optical system α and guides it to a liquid crystal panel (image forming element) for RGB three colors. .

  Reference numeral 5 denotes a projection lens barrel that projects light emitted from the color separation / synthesis optical system β onto a screen (projected surface) (not shown). A projection lens optical system, which will be described later, is accommodated in the projection lens barrel 5.

  Reference numeral 6 denotes an optical box that houses the lamp unit 1, the illumination optical system α, and the color separation / synthesis optical system β and to which the projection lens barrel 5 is fixed. The optical box 6 is formed with a lamp case portion 6 a surrounding the lamp unit 1.

  Reference numeral 7 denotes an optical box lid that covers the optical box 6 with the illumination optical system α and the color separation / synthesis optical system β accommodated therein. Reference numeral 8 denotes a power source, 9 denotes a power filter, 10 denotes a ballast power source for lighting the lamp unit 1, and 11 denotes a circuit board for controlling driving of the liquid crystal panel and lighting of the lamp unit 1 by power from the power source 8.

  An optical system cooling fan 12 cools an optical element such as a liquid crystal panel in the color separation / synthesis optical system β by sucking air from an air inlet 21a of an exterior cabinet 21 described later, and 13 is a cooling generated by the optical system cooling fan 12. This is a fan duct that sends wind to an optical element such as a liquid crystal panel in the color separation / synthesis optical system β.

  A lamp cooling fan 14 blows cooling air to the lamp unit 1 to cool the lamp unit 1 and is disposed between the lamp unit 1 and the projection lens barrel 5.

  A fan holding member 15 holds the lamp cooling fan 14. Reference numeral 16 denotes a fan holding plate, and reference numeral 17 denotes a power source by sucking air from an air inlet 21b provided in an exterior cabinet 21 to be described later, thereby allowing cooling air to flow in the power source 8 and blowing air to the ballast power source 10. 8 and a power supply cooling fan for simultaneously cooling the ballast power supply 10.

  Reference numeral 18 denotes an exhaust fan. The exhaust fan 18 exhausts the hot air blown from the lamp cooling fan 14 and passed through the lamp unit 1 and the hot air that has cooled the ballast power source 10 from the exhaust port 24a provided in the exterior side plate 24 described later to the outside of the image projection apparatus. To do.

  Reference numeral 19 denotes a lamp heat sink. Reference numeral 20 denotes a lamp exhaust / light shielding mask, which has a heat radiating function of the lamp unit 1 and a function of a ventilation duct through which hot air that has cooled the lamp unit 1 passes, and further prevents light from the lamp unit 1 from leaking outside the apparatus. It has a light shielding function.

  Reference numeral 21 denotes an exterior cabinet (exterior lower case) that houses the optical box 6 and the like, and the exterior cabinet 21 is formed with the above-described intake ports 21a and 21b. Reference numeral 22 denotes an exterior cabinet lid (exterior upper case) for covering the exterior cabinet 21 with the optical box 6 and the like stored therein. Reference numeral 23 denotes an exterior side plate arranged on the left side when viewed from the front of the projection lens barrel 5, and reference numeral 24 denotes an exterior side plate arranged on the right side. The exterior side plate 24 has the exhaust port 24a described above.

  Reference numeral 25 denotes an element cooling fan for cooling an optical element such as a polarizing element constituting the color separation / synthesis optical system β. The element cooling fan 25 blows air from an air inlet (not shown) of the exterior cabinet 21 to the optical element through a duct portion (not shown) formed in the exterior cabinet 21.

  Reference numeral 26 denotes an interface reinforcing plate attached to the inside of the exterior side plate 23. Reference numeral 27 denotes an exterior heat radiating plate, which is attached to the lamp case 6a and radiates heat from the lamp unit 1.

  Reference numeral 28 denotes a lamp lid. The lamp lid 28 is detachably provided on the bottom surface of the exterior cabinet 21 and is fixed by a screw (not shown). Reference numeral 29 denotes a set adjustment leg fixed to the exterior cabinet 21. The set adjustment leg 29 can adjust the height of its leg portion 29a. The inclination angle of the image projection apparatus can be adjusted by adjusting the height of the leg 29a.

<Optical configuration>
Next, referring to FIG. 2, the lamp unit 1, the illumination optical system α, the color separation / synthesis optical system β, the reflective liquid crystal display element (liquid crystal panel), and the projection lens optical system 70 in the projection lens barrel 5 are used. The configuration of the configured image display optical system is described.

  In FIG. 2, 41 is an arc tube such as an ultra-high pressure mercury lamp that emits white light in a continuous spectrum, and 42 is a reflector that reflects light from the arc tube 41 and collects it in a predetermined direction. The arc tube 41 and the reflector 42 constitute the lamp unit 1. γ is the optical axis of the image projection optical system, and indicates the traveling direction of light from the lamp unit 1.

  43a is a first cylinder array composed of a lens array having a refractive power in a direction perpendicular to the paper surface of FIG. 2 (hereinafter simply referred to as a vertical direction), and 43b is an individual lens of the first cylinder array 43a. A second cylinder array having a corresponding lens array. 44 is an ultraviolet absorption filter, and 45 is a polarization conversion element that aligns non-polarized light with light having a predetermined polarization direction.

  46 is a front compressor composed of a cylindrical lens having a refractive power in the horizontal direction (in-plane direction of the paper surface of FIG. 2), and 47 is a mirror for changing the direction of the optical axis γ by 90 degrees. 48 is a condenser lens, and 49 is a rear compressor composed of a cylindrical lens having refractive power in the horizontal direction. The illumination optical system α is configured as described above.

  Reference numeral 58 denotes a dichroic mirror that reflects light in the blue (B) and red (R) wavelength regions and transmits light in the green (G) wavelength region. Reference numeral 59 denotes a green incident-side polarizing plate in which a polarizing element is attached to a transparent substrate, and transmits only S-polarized light. Reference numeral 60 denotes a first polarization beam splitter that transmits P-polarized light and reflects S-polarized light, and has a polarization separation surface (polarization separation film) between a pair of triangular prism-shaped glass blocks.

  61R, 61G and 61B are a reflective liquid crystal display element for red, a reflective liquid crystal display element for green, and a reflective liquid crystal display element for blue, respectively, which reflect incident light and modulate the image. The liquid crystal display elements 61R, 61G, and 61B are connected to a drive circuit 110 that drives them. The drive circuit 110 is connected to an image information supply device 120 such as a personal computer, a DVD player, a video deck, or a TV tuner. Is connected. The drive circuit 110 receives video (image) information from the image information supply device 120 and causes the liquid crystal display elements 61R, 61G, and 61B to form original images according to the video information. 62R, 62G, and 62B are a quarter wavelength plate for red, a quarter wavelength plate for green, and a quarter wavelength plate for blue, respectively. 64 is an incident-side polarizing plate for green and blue, in which a polarizing element is attached to a transparent substrate, and transmits only S-polarized light.

  Reference numeral 65 denotes a first color selective phase difference plate that converts the polarization direction of blue light by 90 degrees and does not convert the polarization direction of red light. Reference numeral 66 denotes a second polarization beam splitter that transmits P-polarized light and reflects S-polarized light, and has a polarization separation surface (polarization separation film) between a pair of triangular prism-shaped glass blocks. Reference numeral 67 denotes a second color selective phase difference plate that converts the polarization direction of red light by 90 degrees and does not convert the polarization direction of blue light.

  Reference numeral 68 denotes an exit-side polarizing plate (polarizing element) for red and blue, which transmits only S-polarized light. Reference numeral 69 denotes a third polarization beam splitter as a color synthesis optical member that transmits P-polarized light and reflects S-polarized light, and has a polarization separation surface (polarization separation film) between a pair of triangular prism-shaped glass blocks. .

  The above-described dichroic mirror 58 and the third polarizing beam splitter 69 constitute a color separation / synthesis optical system β.

<Optical action>
Next, the optical action of the image display optical system will be described. Light emitted from the arc tube 41 is reflected by the reflector 42 and collected in a predetermined direction. The reflector 42 has a paraboloid shape, and light from the focal position of the paraboloid becomes a light beam substantially parallel to the axis of symmetry of the paraboloid. However, since the light source from the arc tube 41 is not an ideal point light source but has a finite size, the condensed light flux contains many light components that are not parallel to the symmetry axis of the paraboloid. Yes. These light beams are incident on the first cylinder array 43a.

  The light beam incident on the first cylinder array 43a is divided and condensed into a plurality of light beams corresponding to the respective cylinder lenses, and becomes a plurality of strip-shaped light beams extending in the horizontal direction. The plurality of light fluxes form a focal point in the vicinity of the polarization conversion element 45 via the ultraviolet absorption filter 44 and the second cylinder array 43b.

  The polarization conversion element 45 includes a polarization separation surface, a reflection surface, and a half-wave plate, and the plurality of light beams are incident on a polarization separation surface corresponding to each column of the light beams and reflected by the transmitted P-polarized light component. Divided into S-polarized components. The reflected S-polarized component is reflected by the reflecting surface and emitted in the same direction as the P-polarized component. On the other hand, the transmitted P-polarized light component is transmitted through the half-wave plate and converted to the same polarized light component as the S-polarized light component. As a result, light having the same polarization direction is emitted from the polarization conversion element 45.

  The plurality of light beams that have undergone polarization conversion are reflected by a mirror 47 through a front compressor 46 and reach a condenser lens 48 and a rear compressor 49. The front compressor 46, the condenser lens 48, and the rear compressor 49 superimpose rectangular images of the plurality of light beams on each other by these optical actions to form a rectangular uniform illumination area. Reflective liquid crystal display elements 61R, 61G, 61B are arranged in this illumination area.

  The light converted to S-polarized light by the polarization conversion element 45 enters the dichroic mirror 58. The dichroic mirror 58 reflects blue (430 to 495 nm) and red (590 to 650 nm) light and transmits green (505 to 580 nm) light.

  Next, the optical path of green light (hereinafter referred to as G light) will be described. The G light transmitted through the dichroic mirror 58 enters the incident side polarizing plate 59. The G light remains S-polarized light after being decomposed by the dichroic mirror 58. Then, the G light exits from the incident-side polarizing plate 59 and then enters the first polarizing beam splitter 60 as S-polarized light, and is reflected by the polarization separation surface of the first polarizing beam splitter 60. To the reflective liquid crystal display element 61G.

  In the reflective liquid crystal display element 61G for G, the G light is image-modulated and reflected. Of the image-modulated G light (reflected light), the S-polarized light component is reflected again by the polarization separation surface of the first polarization beam splitter 60, returned to the light source side, and removed from the projection light. On the other hand, the P-polarized component of the image-modulated G light passes through the polarization separation surface of the first polarization beam splitter 60 and travels to the third polarization beam splitter 69 as projection light. At this time, in a state where all the polarization components are converted to S-polarized light (a state in which black is displayed), 1/4 provided between the first polarizing beam splitter 60 and the G-use reflective liquid crystal display element 61G. By adjusting the slow axis of the wave plate 62G in a predetermined direction, the influence of the disturbance of the polarization state generated in the first polarizing beam splitter 60 and the reflective liquid crystal display element 61G for G can be suppressed to a low level.

  The G light emitted from the first polarization beam splitter 60 enters the third polarization beam splitter 69 as P-polarized light, passes through the polarization separation surface of the third polarization beam splitter 69, and is a projection lens optical system 70. It leads to.

  On the other hand, red and blue light reflected by the dichroic mirror 58 (hereinafter, referred to as R light and B light, respectively) enter the incident-side polarizing plate 64. Note that the R light and B light remain S-polarized light even after being decomposed by the dichroic mirror 58. Then, the R light and the B light are emitted from the incident side polarizing plate 64 and then incident on the first color selective phase difference plate 65. The first color-selective retardation plate 65 has an action of rotating the polarization direction of the B light by 90 degrees, whereby the B light becomes P-polarized light and the R light becomes S-polarized light, and the second polarization beam splitter 66. Is incident on. The R light incident on the second polarization beam splitter 66 as S-polarized light is reflected by the polarization separation surface of the second polarization beam splitter 66 and reaches the R reflective liquid crystal display element 61R.

  Further, the B light incident on the second polarization beam splitter 66 as P-polarized light passes through the polarization separation surface of the second polarization beam splitter 66 and reaches the B reflective liquid crystal display element 61B.

  The R light incident on the reflective liquid crystal display element 61R for R is image-modulated and reflected. Of the image-modulated R light (reflected light), the S-polarized light component is reflected again by the polarization separation surface of the second polarizing beam splitter 66, returned to the light source side, and removed from the projection light. On the other hand, the P-polarized component of the image-modulated R light passes through the polarization separation surface of the second polarization beam splitter 66 and travels to the second color-selective phase plate 67 as projection light.

  The B light incident on the B reflective liquid crystal display element 61B is image-modulated and reflected. The P-polarized component of the image-modulated B light (reflected light) is transmitted again through the polarization separation surface of the second polarization beam splitter 66, returned to the light source side, and removed from the projection light. On the other hand, the S-polarized light component of the image-modulated B reflected light is reflected by the polarization separation surface of the second polarization beam splitter 66 and travels toward the second color selective phase plate 67 as projection light.

  At this time, by adjusting the slow axes of the quarter-wave plates 62R and 62B provided between the second polarizing beam splitter 66 and the reflective liquid crystal display elements 61R and 61B for R and B, G The black display of each of the R and B lights can be adjusted as in the case of light.

  Thus, the R light of the R and B projection lights emitted from the second polarization beam splitter 66, which is synthesized into one light beam, is rotated by 90 degrees by the second color selective phase plate 67, and is S-polarized light. It becomes a component, is further analyzed by the exit-side polarizing plate 68, and enters the third polarizing beam splitter 69. The B light passes through the second color-selective phase plate 67 as S-polarized light, is further analyzed by the exit-side polarizing plate 68, and enters the third polarizing beam splitter 69. By being analyzed by the exit-side polarizing plate 68, the R and B projection lights are reflected by the second polarizing beam splitter 66 and the R and B reflective liquid crystal display elements 61R and 61B, the quarter wavelength plate 62R, The ineffective component generated by passing through 62B becomes light that is cut.

  The R and B projection light incident on the third polarization beam splitter 69 is reflected by the polarization separation surface of the third polarization beam splitter 69, and is combined with the G light reflected by the polarization separation surface described above. The projection lens optical system 70 is reached. As a result, the combined R, G, B projection light is enlarged and projected onto a projection surface such as a screen by the projection lens optical system 70.

  The optical path described above is for the case where the reflective liquid crystal display element is in the white display state, so the optical action when the reflective liquid crystal display element is in the black display state will be described below.

  First, the optical path of G light will be described. The G light (S-polarized light) that has passed through the dichroic mirror 58 enters the incident-side polarizing plate 59, and then enters the first polarizing beam splitter 60 and is reflected by the polarization separation surface thereof. The display element 61G is reached. However, since the reflective liquid crystal display element 61G is in the black display state, the G light is reflected without being image-modulated. Accordingly, even after being reflected by the reflective liquid crystal display element 61G, the G light remains as S-polarized light, is reflected again by the polarization separation surface of the first polarization beam splitter 60, and is transmitted through the incident-side polarizing plate 59. It is returned to the light source side and removed from the projection light.

  Next, the optical paths of R light and B light will be described. The R light and B light (S-polarized light) reflected by the dichroic mirror 58 enter the incident-side polarizing plate 64. The R light and the B light are emitted from the incident-side polarizing plate 64 and then incident on the first color-selective retardation plate 65. The first color-selective phase difference plate 65 has an action of rotating the polarization direction of only B light by 90 degrees, so that the B light becomes P-polarized light and the R light becomes S-polarized light. The light enters the beam splitter 66.

  The R light incident on the second polarizing beam splitter 66 as S-polarized light is reflected by the polarization separation surface of the second polarizing beam splitter 66 and reaches the R reflective liquid crystal display element 61R. The B light incident on the second polarizing beam splitter 66 as P-polarized light passes through the polarization separation surface of the second polarizing beam splitter 66 and reaches the B-use reflective liquid crystal display element 61B.

  Here, since the R reflective liquid crystal display element 61R is in a black display state, the R light incident on the R reflective liquid crystal display element 61R is reflected without being image-modulated. Therefore, even after being reflected by the reflective liquid crystal display element 61R for R, the R light remains as S-polarized light, and is reflected again by the polarization separation surface of the first polarization beam splitter 60, and the incident-side polarizing plate 64 is reflected. It passes back to the light source side and is removed from the projection light. That is, black is displayed on the projection surface.

  On the other hand, the B light incident on the B reflective liquid crystal display element 61B is reflected without being image-modulated because the B reflective liquid crystal display element 61B is in a black display state. Accordingly, even after being reflected by the reflective liquid crystal display element 61B for B, the B light remains as P-polarized light, passes through the polarization separation surface of the first polarization beam splitter 60 again, and has the first color selectivity. The light is converted into S-polarized light by the phase difference plate 65, passes through the incident-side polarizing plate 64, returns to the light source side, and is removed from the projection light.

<Optical device>
Hereinafter, the holding mechanism for the exhaust fan 18 of the liquid crystal projector apparatus according to the present embodiment will be described with reference to FIGS. FIG. 3 shows a method of holding the exhaust fan 18 that exhausts the heat generated inside the liquid crystal projector apparatus.

  The optical box 6 is provided with a holding part 6b for holding an exhaust fan 18, and the holding part 6b causes the exhaust fan 18 to be spaced apart from the exhaust port 6c of the lamp unit 1 by a distance (gap) of several centimeters. Has been. In addition, suction ports 76, 77, 78 of the exhaust fan 18 are provided between the exhaust fan 18 and the exhaust port 6 c of the lamp unit (heating element) 1. Further, a vibration-proof elastomer or rubber spacer member (vibration-proof rubber) 100 is disposed at the four corners of the exhaust fan 18 and is held so as to be sandwiched between the optical box 6 and the fan presser metal plate 19.

  By attaching the exhaust fan 18 to the optical box 6 in this manner, unlike the case where the fan is directly attached to the exterior cabinet 21 of the liquid crystal projector device, vibration is hardly transmitted directly to the exterior cabinet 21. Furthermore, attaching the exhaust fan 18 to the optical box 6 via the spacer member 100 makes it difficult for vibration of the exhaust fan 18 due to the motor to be transmitted to the optical box 6. For this reason, the noise generated by the vibration of the exhaust fan 18 transmitted to the exterior cabinet (exterior member) of the liquid crystal projector can be reduced, and the liquid crystal projector apparatus can be made quiet.

  Next, the suction ports 76, 77, 78 of the exhaust fan 18 between the exhaust fan 18 and the exhaust port 6c of the lamp unit 1 will be described. Air (hot air) warmed inside the liquid crystal projector device in the present embodiment is exhausted from the exhaust port 24a of the exterior side plate 24 shown in FIG. 1, which is the only exhaust port. The exhaust port 24a is provided with a punching metal 24a having countless small holes in an iron plate through which air can pass, for example.

  FIG. 3 shows a state in which the exterior side plate 24 and the ballast power source 10 are removed. The exhaust fan 18 sucks hot air in the projector device from openings 76, 77, 78 provided in the optical box 6. Furthermore, as shown in FIG. 5, an opening 79 for suction is also provided in the lower part of the optical box 6 so that mainly hot air from the lower part of the lamp holder 2 is sucked. That is, the openings 76, 77, 78, and 79 suck hot air (second air) 71 to 74 from the outside other than the direct hot air (first air) from the lamp unit 1.

  As described above, in this embodiment, by increasing the number of intake ports of the exhaust fan 18, an increase in the operating pressure of the exhaust fan 18 is suppressed, and an effect of reducing the beat noise of the exhaust fan 18 due to the increase in the operating pressure is obtained. The noise of the projector device can be reduced.

  Further, the exhaust fan 18 is configured to simultaneously suck in hot air generated in the lamp unit 1 from the exhaust port 6 c of the lamp unit 1. For this reason, cooling in the lamp unit 1 is further promoted. At the time of this exhaust, there is a temperature difference between the temperature of the hot air 71 to 74 sucked from the openings 76 to 79 provided in the optical box 6 and the hot air sucked from the lamp unit 1. The temperature of the hot air 71 to 74 sucked from the openings 76 to 79 is lower than that of the hot air sucked from the unit 1. For this reason, both hot air is mixed by being sucked into the exhaust fan 18, and the temperature is averaged.

  Accordingly, the exhaust temperature of the one that is simultaneously sucked from the openings 76 to 79 provided in the optical box 6 and exhausted by the exhaust fan 18 is lower than the exhaust temperature when only the exhaust from the lamp unit 1 is discharged outside the projector device. Thus, the exterior side plate 24 and the punching metal 24a are cooled by the exhaust 75 without excessive heat generation.

  In particular, when the punching metal 24a becomes hot due to exhaust heat, the user may feel uncomfortable when moving the installation location during the operation of the liquid crystal projector device and touching the exhaust part. It is possible to eliminate discomfort for the user by lowering the value.

  Further, when a small gap is provided between the exterior component made of the punching metal 24a and the exhaust fan 18, the pressure of the exhaust fan 18 rises and wind that cannot be blown out from the opening hole of the punching metal 24a. It may bounce off the punching metal 24a, be taken in again from the openings 76, 77, 78 and circulate. As a result, the effect of lowering the exhaust temperature is impaired, so that it is desirable that the air passage leaking from a slight gap is closed by providing ribs 90 or the like so that the exhaust is reliably exhausted from the punching metal 24a.

  Thus, in this embodiment, a structure for holding the exhaust fan 18 is provided in the optical box 6 that holds a plurality of optical components including a light source that is a heat generation source, and not only the heat generated from the light source is exhausted but also the optical In the box 6, the exhaust fan 18 is set apart from the light source, and a new air intake port is provided in the separated part. For this reason, it is possible to prevent an increase in noise due to an increase in the operating pressure of the exhaust fan 18 by taking in not only the air (first air) from the light source that is the heat generating part but also the air (second air) in the apparatus. In addition, the exhaust temperature can be reduced.

  Further, the exhaust fan 18 is not directly attached to the optical box 6, but the exhaust fan 18 is attached to the optical box 6 via the spacer member 100 so that the vibration of the exhaust fan 18 is not easily transmitted to the optical box 6, thereby further reducing noise. Has been realized.

  Furthermore, since the exhaust air is lowered by the air heated by the lamp unit 1 and the air taken in from the openings 76 to 79 being mixed by the exhaust fan 18, the exhaust is separated from another heat generating part, such as a circuit. It becomes possible to use it for cooling.

  In addition, although four openings (four directions) of the openings 76 to 79 are provided between the lamp unit 1 and the exhaust fan 18, they may be provided in at least two directions (two openings) around the exhaust fan 18. Preferably, an opening is provided on each side facing the exterior cabinet 21 and the exterior cabinet lid 22. Thereby, since an air flow, that is, an air passage is formed between the optical box and the exterior cabinet, the cooling efficiency of the second air can be improved, and the overall cooling efficiency can also be improved.

  In the second embodiment of the present invention, the method for holding the exhaust fan 18 of the first embodiment is applied to the cooling fan 17 of the power supply 8. FIG. 6 shows the power supply 8 attached to the rear part of the projector device in FIG.

  The power supply 8 is a unit in which a power supply circuit 200 of the projector apparatus is included. The power supply circuit 200 is covered with an insulating sheet (not shown), and is provided in aluminum-made cylindrical power supply cases 81 and 82. . As shown in FIG. 7, the power supply case 82 is provided with three mounting holes for the cooling fan 17, and the mounting holes and the flange portion of the cooling fan 17 are held by the spacer member 101.

  The spacer member 101 is provided to separate the cooling fan 17 and the power supply case 82 from each other and hold the cooling fan on the power supply case 82, and vibration due to the rotation of the cooling fan 17 is caused by the spacer member 101. It is provided to reduce transmission to the cases 81 and 82. Accordingly, since, for example, an elastomer or various rubbers having high vibration damping performance are used as in the first embodiment, the same vibration isolation effect can be obtained.

  In addition, since a gap is provided between the power supply case 82 and the cooling fan 17, an increase in the operating pressure of the cooling fan 17 can be prevented. As shown in FIG. 6, by rotating the cooling fan 17, cold air is sucked from the suction port 80, and the power supply circuit 200 in the power supply cases 81 and 82 is cooled. The air heated in the power supply cases 81 and 82 is exhausted by the cooling fan 17.

  At this time, air outside the power supply case is sucked from the four directions 84, 85, 86, and 87 of the cooling fan 17 through a gap provided between the cooling fan 17 and the power supply cases 81 and 82. The inside of the power supply case has a complicated air path due to the power supply circuit 200, and the operating pressure of the cooling fan 17 tends to increase. Therefore, if the power cooling fan 17 is held in close contact with the power supply case 82, the operating pressure of the fan is It goes up further, and a fanning noise is generated.

  Therefore, it is possible to prevent the operating pressure of the cooling fan 17 from being increased by providing an appropriate space between the cooling fan 17 and the power supply case 82 and simultaneously sucking in cold air therefrom.

  For this reason, the roaring sound of the cooling fan 17 due to the increase in the operating pressure is reduced, and the projector device can be silenced. Furthermore, since the hot air passing through the power supply cases 81 and 82 and the air sucked from between the cooling fan 17 and the power supply case 82 are mixed by the cooling fan 17, the exhaust temperature exhausted from the cooling fan 17 is average. Furthermore, the air exhausted from the cooling fan 17 can be cooled and used as cooling air for cooling another part of the projector apparatus.

  Specifically, as shown in FIG. 6, for example, it can be used as cooling air for cooling a ballast power supply 10 provided with an activation circuit, a drive circuit, and the like that light the lamp unit 1.

  In the first and second embodiments, the fans such as the cooling fan 17 and the exhaust fan are constituted by axial fans. However, in the present invention, the type of the fan is not limited to the axial fan, but a sirocco fan, a cross flow fan, or the like. Other fans may be used.

  In the first and second embodiments, the image projection apparatus has been described as an example. However, the present invention can also be applied to a stepper apparatus or the like. The present invention can also be applied to an optical apparatus such as an exposure apparatus and a copying machine.

1 is an exploded perspective view of an image projection apparatus in Embodiment 1 of the present invention. It is an optical system arrangement | positioning figure of the image projection apparatus in Example 1 of this invention. 1 is an exploded perspective view of an image projection apparatus in Embodiment 1 of the present invention. It is a perspective view of the optical box of the image projector in Example 1 of this invention. It is a perspective view of the optical box of the image projector in Example 1 of this invention. It is a perspective view of the power supply case and ballast power supply in Example 2 of this invention. It is a disassembled perspective view of the power supply case in Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lamp unit 2 Lamp holder 8 Power supply 10 Ballast power supply 17 Cooling fan 18 Exhaust fan 21 Exterior cabinet (lower part of exterior case)
22 Exterior cabinet lid (upper case top)
23 exterior side plate 24 exterior side plate 71-74 exhaust (second air)
75 Exhaust (first air)
76 to 79 Aperture 100 Spacer member α Illumination optical system β Color separation / synthesis optical system

Claims (13)

A holding member that houses the heating element;
A heating element holding unit having a fan held by the holding member and sucking out the first air that has cooled the heating element from the inside of the holding member,
An opening for sucking the second air from the outside of the holding member is formed in a portion of the unit on the suction port side of the fan.   The heating element holding unit according to claim 1, wherein the temperature of the second air is lower than that of the first air.   The heating element holding unit according to claim 1 or 2, wherein the openings are formed in at least two directions around the fan.   The optical device according to claim 1, wherein the opening is provided on a side facing an exterior member that covers the heating element holding unit.   The heating element holding unit according to any one of claims 1 to 4, wherein the opening is formed in the holding member.   The heating element holding unit according to any one of claims 1 to 4, wherein the opening is formed between the holding member and the fan.   The heating element holding unit according to claim 6, wherein the fan is held by the holding member via a spacer member made of an elastic material.   The heating element holding unit according to any one of claims 1 to 7, wherein the heating element is a lamp.   The heating element holding unit according to any one of claims 1 to 7, wherein the heating element is an electric circuit. A heating element holding unit according to any one of claims 1 to 9,
A heating element different from the heating element,
An optical apparatus, wherein air discharged from a fan of the heating element holding unit is used for cooling the another heating element. A heating element holding unit according to any one of claims 1 to 9,
An optical device comprising: a member that restricts suction of air discharged from the fan of the heating element holding unit from the opening.   12. The optical apparatus according to claim 10, wherein the optical apparatus is an image projection apparatus that modulates light from a light source by an image forming element and projects light from the image forming element. An image projection apparatus according to claim 12,
An image display system comprising: an image information supply device that supplies image information to the image projection device.

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