JP2010243915A - Illuminating device and projection type image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminating device and a projection type image display apparatus capable of easily cooling a shutter. <P>SOLUTION: The projection type image display apparatus 100 includes: the shutter 40 provided between a light source 10 and an optical element group 20; a thermoelectric transducer 50 positioned on the light source 10 side of the shutter 40 in a closed state of the shutter 40; and a shutter cooling device 120 electrically connected to the thermoelectric transducer 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illuminating device and a projection display apparatus including a shutter that blocks light emitted from a light source.

  Conventionally, a projection display apparatus that projects light emitted from a light source such as a lamp onto a screen has been widely used. In such a projection display apparatus, it is possible to obtain better responsiveness when the light emitted from the light source is mechanically blocked and then opened rather than when the light source is temporarily turned off and then turned on. For this reason, there is a case in which it is desired to mechanically block the emitted light instead of turning off the light source.

  Specifically, when the same image as the user's personal computer screen is displayed on the screen, the user's personal computer operation may not be displayed on the screen. In this case, it is necessary to block the light emitted from the light source while the user operates the personal computer.

  Furthermore, the light emitted from the light source can be more stably blocked by the physical means such as a metal plate than the light emitted from the light source is restricted by controlling the light modulation element.

  Here, a technique is known in which a shutter that blocks light emitted from a light source is provided on the light emission side of the light source (Patent Document 1). In this method, the light emitted from the light source can be blocked by closing the shutter.

JP 2002-365607 A

  However, in the above method, since the light emitted from the light source continues to hit the shutter, the shutter may be damaged due to excessive heating.

  Here, it is conceivable to provide a cooling device for cooling the shutter when the shutter is closed. However, in order to properly operate such a cooling device, a sensor that detects the open / close state of the shutter, a control device that controls the operation of the cooling device according to the detection result of the sensor, and further, the cooling device is connected to a power source. It is necessary to provide wiring for the purpose. As a result, the assembling property of the projection display apparatus is lowered and the manufacturing cost is increased.

  Therefore, the present invention has been made in view of the above-described situation, and an object thereof is to provide an illumination device and a projection display apparatus that can cool a shutter easily.

  An illumination device according to a feature of the present invention includes a light source, an optical element to which light emitted from the light source is irradiated, a shutter that is openable and closable between the light source and the optical element, and a closed state of the shutter. The gist is to include a thermoelectric conversion element positioned on the light source side of the shutter, and a cooling device that is electrically connected to the thermoelectric conversion element and cools the shutter.

  According to the illumination device according to the feature of the present invention, when the shutter is in a closed state, the thermoelectric conversion element generates an electromotive force due to a temperature difference between a surface on which light emitted from the light source is incident and a surface in contact with the shutter. To emit. The shutter cooling device is operated by an electromotive force generated by the thermoelectric conversion element. Thus, there is no need to provide wiring for supplying power from the power source to the shutter cooling device, and there is no need to provide a control device for controlling the operation of the shutter cooling device. As a result, the shutter can be easily cooled.

In the illumination device according to the feature of the present invention, the shutter may include a heat sink on the opposite side of the light source.

 In the illumination device according to the feature of the present invention, the shutter may have a plurality of convex portions on the opposite side of the light source.

   In the illumination device according to the feature of the present invention, the surface of the thermoelectric conversion element on the light source side may be black.

  A projection display apparatus according to the features of the present invention includes a light source, an optical element irradiated with light emitted from the light source, a projection optical system that projects light emitted from the optical element, a light source, and an optical element. A shutter that is openable and closable, a thermoelectric conversion element that is located on the light source side of the shutter in the closed state of the shutter, and a cooling device that is electrically connected to the thermoelectric conversion element and cools the shutter. Is the gist.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device and projection type video display apparatus which can cool a shutter simply can be provided.

It is a perspective view which shows the structure inside the housing | casing of the projection type video display apparatus 100 concerning embodiment. It is a top view which shows the structure inside the housing | casing of the projection type video display apparatus 100 concerning embodiment. It is a schematic diagram which shows the structure of the projection type video display apparatus 100 concerning embodiment. It is a side view which shows the structure of the heat sink 45 which concerns on embodiment.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(Schematic configuration of the projection display)
Hereinafter, a schematic configuration of the projection display apparatus 100 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the structure inside the housing of the projection display apparatus 100. FIG. 2 is a plan view showing a structure inside the housing of the projection display apparatus 100. FIG.

  As shown in FIGS. 1 and 2, the projection display apparatus 100 includes a light source 10, an optical element group 20, a projection lens unit (projection optical system) 30, a shutter 40, a thermoelectric conversion element 50, and a light source. A cooling device 110 and a shutter cooling device 120 are provided.

  The light source 10 is a UHP (such as an ultrahigh pressure mercury lamp) that emits white light. The light emitted from the light source 10 includes red component light, green component light, and blue component light. The light emitted from the light source 10 enters the optical element group 20 via a mirror group and a lens group, which will be described later.

  The optical element group 20 includes a liquid crystal panel, a polarizing plate, a lens, and the like for modulating light emitted from the light source. The optical element group 20 emits combined light (image light) of red component light, green component light, and blue component light to the projection lens unit 30.

  The projection lens unit 30 projects the combined light emitted from the optical element group 20 onto a screen or the like.

  The shutter 40 is provided between the light source 10 and the optical element group 20. The shutter 40 is a freely openable / closable shutter for blocking light emitted from the light source 10. The shutter 40 can be switched between an open state and a closed state by sliding the shutter 40.

  Specifically, when the shutter 40 is switched from the open state to the closed state (that is, when light emitted from the light source 10 is blocked), the shutter 40 slides to a position facing the emission surface of the light source 10. On the other hand, when the shutter 40 is switched from the closed state to the open state (that is, when light emitted from the light source 10 is allowed to pass), the shutter 40 slides to a position that does not face the emission surface of the light source 10.

  The shutter 40 has a first surface facing the light source 10 in the closed state, and a second surface provided on the opposite side of the first surface. That is, the first surface is provided on the light source 10 side, and the second surface is provided on the optical element group 20 side. The configuration of the shutter 40 will be described later.

  The thermoelectric conversion element 50 uses the Seebeck effect to directly convert thermal energy into electrical energy due to a temperature difference. Specifically, an electromotive force can be generated by setting one of the p-type semiconductor element and the n-type semiconductor element to a higher temperature than the other.

  The thermoelectric conversion element 50 has a light incident surface on which light emitted from the light source 10 is incident and a light emitting surface provided on the opposite side of the light incident surface. That is, the light incident surface is provided on the light source 10 side, and the light emitting surface is provided on the shutter 40 side. The light emission surface of the thermoelectric conversion element 50 is in contact with the first surface of the shutter 40 when the shutter 40 is in the closed state.

  Note that light emitted from the light source 10 is incident on the light incident surface of the thermoelectric conversion element 50. Therefore, the light incident surface of the thermoelectric conversion element 50 is heated to a high temperature. On the other hand, since the light emitting surface of the thermoelectric conversion element 50 is in contact with the first surface of the shutter 40, the temperature is lower than that of the light incident surface.

   In the present embodiment, the light incident surface of the thermoelectric conversion element 50 is black. Such a light incident surface may be made of a black material, or may be painted with a heat-resistant black paint.

  In the present embodiment, the thermoelectric conversion element 50 is fixed to the shutter 40 and slides together with the shutter 40.

  The light source cooling device 110 is a cooling device for cooling the light source 10. In the present embodiment, the light source cooling device 110 is an air cooling type cooling device. Specifically, the light source cooling device 110 discharges the air heated by the light source 10 to the outside of the housing by rotating a cooling fan.

  The shutter cooling device 120 is a cooling device for cooling the shutter 40. In the present embodiment, the shutter cooling device 120 is an air-cooled cooling device. Specifically, the shutter cooling device 120 discharges the air heated by the shutter 40 to the outside of the housing by rotating a cooling fan.

  Here, the shutter cooling device 120 is electrically connected to the thermoelectric conversion element 50 by the wiring 60 as shown in FIG. The shutter cooling device 120 is operated by electric energy (electromotive force) generated by the thermoelectric conversion element 50. Therefore, in the present embodiment, no wiring for electrically connecting the shutter cooling device 120 and the power source is provided. Moreover, since the thermoelectric conversion element 50 emits electric energy when the shutter 40 is in the closed state, the shutter cooling device 120 operates when the shutter 40 is in the closed state and stops when the shutter 40 is in the open state. Therefore, in this embodiment, a control device that controls the operation of the shutter cooling device 120 is not provided.

(Detailed configuration of projection display device)
Hereinafter, a detailed configuration of the projection display apparatus 100 according to the embodiment will be described with reference to the drawings. FIG. 3 is a schematic diagram showing the configuration of the projection display apparatus 100.

  As shown in FIG. 3, the projection display apparatus 100 includes a light source 10, a UV / IR cut filter 12, a fly-eye lens unit 14, a PBS array 16, an optical element group 20, and a cross dichroic prism 27. And a projection lens unit 30.

  The UV / IR cut filter 12 transmits visible light components (red component light, green component light, and blue component light), while shielding extra-visible light components (for example, infrared component light and ultraviolet component light).

  The fly-eye lens unit 14 makes light emitted from the light source 10 uniform. Specifically, the fly eye lens unit 14 includes a fly eye lens 14a and a fly eye lens 14b.

  The fly-eye lens 14a and the fly-eye lens 14b are each composed of a plurality of minute lenses. Each micro lens guides the light emitted from the light source 10 so that the light emitted from the light source 10 is irradiated on the entire surface of the liquid crystal panel 21.

  Here, in the present embodiment, the shutter 40 and the thermoelectric conversion element 50 are disposed between the fly-eye lens 14a and the fly-eye lens 14b. Therefore, by closing the shutter 40 and the thermoelectric conversion element 50, the light emitted from the light source 10 and incident on the optical element group 20 is blocked.

  The PBS array 16 aligns the polarization state of the light emitted from the fly-eye lens unit 14. For example, the PBS array 16 aligns the light emitted from the fly-eye lens unit 14 with S-polarized light.

  Further, the projection display apparatus 100 includes a plurality of liquid crystal panels 21 (liquid crystal panel 21R, liquid crystal panel 21G, liquid crystal panel 21B) and a mirror group (dichroic mirror 200, dichroic mirror 201, reflection mirror 210 to reflection mirror 212). And a lens group (condenser lens 220, condenser lens 230R, condenser lens 230G, condenser lens 230B, relay lens 240 to relay lens 242).

  The dichroic mirror 200 transmits red component light out of the light emitted from the PBS array 16. The dichroic mirror 200 reflects green component light and blue component light in the light emitted from the PBS array 16.

  The dichroic mirror 201 transmits blue component light out of the light reflected by the dichroic mirror 200. The dichroic mirror 201 reflects green component light among the light reflected by the dichroic mirror 200.

  The reflection mirror 210 reflects the red component light and guides the red component light to the liquid crystal panel 21R side. The reflection mirror 211 and the reflection mirror 212 reflect the blue component light and guide the blue component light to the liquid crystal panel 21B side.

  The condenser lens 220 is a lens that collects white light emitted from the light source 10.

  The condenser lens 230R collimates the red component light so that the liquid crystal panel 21R is irradiated with the red component light. The condenser lens 230G collimates the green component light so that the liquid crystal panel 21G is irradiated with the green component light. The condenser lens 230B collimates the blue component light so that the liquid crystal panel 21B is irradiated with the blue component light. A UV cut filter 70 that shields the ultraviolet component is provided on the light exit surface side of the condenser lens 230B.

  The relay lenses 240 to 242 substantially image blue component light on the liquid crystal panel 21 </ b> B while suppressing expansion of the blue component light.

  The liquid crystal panel 21R modulates the red component light by rotating the polarization direction of the red component light. A compensation plate 22R for improving the contrast ratio is provided on the light incident surface side of the liquid crystal panel 21R.

  An incident-side polarizing plate 23R that transmits light having one polarization direction (for example, S-polarized light) and shields light having another polarization direction (for example, P-polarized light) on the light incident surface side of the compensation plate 22R. Is provided. On the light incident surface side of the incident side polarizing plate 23R, there is provided an incident side pre-polarizing plate 24R that reduces the amount of light incident on the incident side polarizing plate 23R and the thermal burden.

  On the other hand, on the light exit surface side of the liquid crystal panel 21R, an exit-side pre-polarizer 25R that reduces the amount of light incident on the exit-side polarizer 26R, which will be described later, and the thermal burden is provided. On the light exit surface side of the exit side pre-polarizing plate 25R, the exit side that blocks light having one polarization direction (for example, S polarization) and transmits light having another polarization direction (for example, P polarization). A polarizing plate 26R is provided.

  Similarly, the liquid crystal panel 21G modulates the green component light by rotating the polarization direction of the green component light. A compensation plate 22G, an incident-side polarizing plate 23G, and an incident-side pre-polarizing plate 24G are provided on the light incident surface side of the liquid crystal panel 21G. On the other hand, an emission side pre-polarizing plate 25G and an emission side polarizing plate 26G are provided on the light emission surface side of the liquid crystal panel 21G.

  Similarly, the liquid crystal panel 21B modulates the blue component light by rotating the polarization direction of the blue component light. A compensation plate 22B, an incident side polarizing plate 23B, and an incident side pre-polarizing plate 24B are provided on the light incident surface side of the liquid crystal panel 21B. On the other hand, an exit side pre-polarizing plate 25B and an exit side polarizing plate 26B are provided on the light exit surface side of the liquid crystal panel 21B.

  The cross dichroic prism 27 combines light emitted from the liquid crystal panel 21R, the liquid crystal panel 21G, and the liquid crystal panel 21B. The cross dichroic prism 27 emits combined light to the projection lens unit 30 side.

  The projection lens unit 30 projects the combined light (image light) emitted from the cross dichroic prism 27 on a screen or the like. Here, the liquid crystal panel 21, the compensation plate 22, the incident side polarizing plate 23, the incident side pre-polarizing plate 24, the output side pre-polarizing plate 25, and the output side polarizing plate 26 constitute the optical element group 20 according to the embodiment. Should be noted.

(Function and effect)
The projection display apparatus 100 according to the embodiment includes a shutter 40 provided between the light source 10 and the optical element group 20, a thermoelectric conversion element 50 positioned on the light source 10 side of the shutter 40 in the closed state of the shutter 40, and A shutter cooling device 120 electrically connected to the thermoelectric conversion element 50 is provided.

  Therefore, when the shutter 40 is in the closed state, in the thermoelectric conversion element 50, a temperature difference is generated between the light incident surface on which light emitted from the light source 10 is incident and the light emitting surface in contact with the shutter 40. Thereby, the thermoelectric conversion element 50 generates an electromotive force. The shutter cooling device 120 is operated by an electromotive force generated by the thermoelectric conversion element 50. Thus, there is no need to provide wiring for supplying power to the shutter cooling device 120, a control device for controlling the operation of the shutter cooling device 120, or the like. As a result, the shutter 40 can be easily cooled.

  Further, since the shutter 40 is provided between the light source 10 and the optical element group 20, when the shutter 40 is in a closed state, the light emitted from the light source 10 is irradiated onto the optical element group 20. It can be avoided. Therefore, by continuing to emit light emitted from the light source 10, it is possible to suppress deterioration due to heat from the light source of the optical components arranged on the downstream side of the light source with respect to the shutter 40.

  In the present embodiment, the light incident surface of the thermoelectric conversion element 50 is black. Therefore, the thermoelectric conversion element 50 can efficiently absorb the light emitted from the light source 10 on the light incident surface. As a result, the thermoelectric conversion efficiency in the thermoelectric conversion element 50 can be improved.

(Modification)
Hereinafter, modifications of the embodiment will be described with reference to the drawings. In the following, differences from the embodiment will be mainly described.

  Specifically, in this modification, as shown in FIG. 4, a heat radiating plate 45 is provided on the second surface of the shutter 40 (the surface opposite to the light source 10 and the thermoelectric conversion element 50).

  The heat radiating plate 45 is bonded to the second surface of the shutter 40 and is slidable together with the shutter 40. The heat sink 45 has a plurality of ribs R. Such a heat radiating plate 45 acts to increase the surface area of the second surface of the shutter 40.

  Therefore, since the cooling efficiency of the shutter 40 can be improved, it is possible to suppress the shutter 40 from being excessively heated and damaged. Furthermore, since the temperature of the 1st surface of the shutter 40 can be made lower, the thermoelectric conversion efficiency of the thermoelectric conversion element 50 can further be improved.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the above-described embodiment, the shutter 40 is provided between the light source 10 and the optical element group 20, but is not limited thereto. The shutter 40 is any of the optical elements (the liquid crystal panel 21, the compensation plate 22, the incident side polarizing plate 23, the incident side pre-polarizing plate 24, the output side pre-polarizing plate 25, and the output side polarizing plate 26) constituting the optical element group 20. It may be provided in one preceding stage.

  In the above-described embodiment, the shutter cooling device 120 discharges air to the outside of the housing. However, the present invention is not limited to this. For example, the shutter cooling device 120 may suck air from the outside of the housing or may be liquid-cooled.

  In the above-described embodiment, the liquid crystal panel 21 is used as the display device, but the present invention is not limited to this. As the display device, LCOS (Liquid Crystal on Silicon), DMD (Digital Micromirror Device), or the like may be used.

  In the above-described embodiment, the UHP lamp is used as the light source 10, but a solid light source may be used.

  In the above-described modification, the heat radiating plate 45 is provided for the purpose of increasing the surface area of the second surface of the shutter 40, but the present invention is not limited to this. For example, a plurality of convex portions may be formed on the second surface of the shutter 40.

  From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 10 ... Light source, 12 ... UV / IR cut filter, 14 ... Fly eye lens unit, 16 ... PBS array, 20 ... Optical element group, 21 ... Liquid crystal panel, 22 ... Compensation plate, 23 ... Incident side polarizing plate, 24 ... Incident Side pre-polarizing plate, 25 ... Emission side pre-polarizing plate, 26 ... Emission side polarizing plate, 27 ... Cross dichroic prism, 30 ... Projection lens unit, 40 ... Shutter, 45 ... Heat radiation plate, 50 ... Thermoelectric conversion element, 60 ... Wiring , 70 ... UV cut filter, 100 ... Projection type image display device, 200, 201 ... Dichroic mirror, 210 to 212 ... Reflection mirror, 220 ... Condenser lens, 230 ... Condenser lens, 240 to 242 ... Relay lens, 110 ... Light source cooling Device, 120 ... shutter cooling device

Claims (5)

A light source;
An optical element irradiated with light emitted from the light source;
A shutter that is provided between the light source and the optical element and that can be opened and closed;
A thermoelectric conversion element positioned on the light source side of the shutter in the closed state of the shutter;
A lighting device comprising: a cooling device that is electrically connected to the thermoelectric conversion element and cools the shutter.   The lighting device according to claim 1, wherein the shutter includes a heat radiating plate on a side opposite to the light source.   The lighting device according to claim 1, wherein the shutter has a plurality of convex portions on a side opposite to the light source.   The lighting device according to claim 1, wherein a surface of the thermoelectric conversion element on the light source side is black. A light source;
An optical element irradiated with light emitted from the light source;
A projection optical system for projecting light emitted from the optical element;
A shutter that is provided between the light source and the optical element and that can be opened and closed;
A thermoelectric conversion element positioned on the light source side of the shutter in the closed state of the shutter;
A projection display apparatus comprising: a cooling device that is electrically connected to the thermoelectric conversion element and cools the shutter.

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