JP2004069966A - Illumination optical apparatus and projector therewith - Google Patents

Illumination optical apparatus and projector therewith Download PDF

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Publication number
JP2004069966A
JP2004069966A JP2002228572A JP2002228572A JP2004069966A JP 2004069966 A JP2004069966 A JP 2004069966A JP 2002228572 A JP2002228572 A JP 2002228572A JP 2002228572 A JP2002228572 A JP 2002228572A JP 2004069966 A JP2004069966 A JP 2004069966A
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Japan
Prior art keywords
light
illumination optical
lens array
device
shielding plate
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JP2002228572A
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Japanese (ja)
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JP4075509B2 (en
JP2004069966A5 (en
Inventor
Akira Momose
百瀬 明
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Seiko Epson Corp
セイコーエプソン株式会社
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Priority to JP2002228572A priority Critical patent/JP4075509B2/en
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Publication of JP2004069966A5 publication Critical patent/JP2004069966A5/ja
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination optical apparatus of which the light source device is not restricted on kind, and which can sufficiently obtain a contrast. <P>SOLUTION: A light control device 480 for reducing a light amount in a light path is provided between a first lens array 418 and a second lens array 414 arranged to face the first lens array 418 and having a conjugation relation with a light source device 413. When controlling the light amount, since there is no need to control the light amount of a light source lamp 411, a high-pressure mercury lamp, a halogen lamp or metal halide lamp can be used as the light source lamp 411. Furthermore, the illumination optical apparatus is configured to reduce the light amount in the light path by the light control device 480, so that the sufficient contrast can be obtained by controlling the reduction amount. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illumination optical device including a light source device, a first lens array that divides the speed of light emitted from the light source device, a second lens array that is disposed to face the first lens array, and the The present invention relates to a projector including an illumination optical device.
[0002]
[Background]
Conventionally, it is known to use a projector for presentations at conferences, academic conferences, exhibitions, and the like. Such a projector is provided with an illumination optical device that divides the light beam emitted from the light source device into a plurality of light beams by the first lens array and condenses the divided light beam by the second lens array.
In order to obtain a sufficient contrast in a projected optical image, a light control device that adjusts the amount of light emitted from the light source device is conventionally provided.
[0003]
A conventional light control device employs a configuration that controls the amount of light emitted from the light source device itself.
For example, there is a light control device disclosed in Japanese Patent Laid-Open No. 3-179886. This light control device is configured to control the amount of light emitted from the metal halide lamp.
[0004]
[Problems to be solved by the invention]
The light control device disclosed in Japanese Patent Application Laid-Open No. 3-179886 controls the amount of light emitted from the light source device. However, when a currently mainstream high-pressure mercury lamp is used as the light source device, the amount of light can be changed. In addition, it can be dimmed only by about 30%.
Therefore, in the conventional example, the type of the light source device to be used is limited, and furthermore, there is a problem that the contrast cannot be sufficiently increased.
In particular, when a projector is used for a home theater or the like, a projector capable of obtaining a high contrast image is desired.
[0005]
In view of such problems, an object of the present invention is to provide an illumination optical device that can obtain a sufficient contrast while the type of the light source device is not limited and a projector including the illumination optical device.
[0006]
[Means for Solving the Problems]
An illumination optical device according to the present invention includes a light source device, a light beam emitted from the light source device, divided into a plurality of partial light beams, a first lens array disposed on the light source device side, and facing the first lens array. An illumination optical apparatus including a second lens array that is disposed and is substantially conjugated with the light source device, the light quantity in the optical path between the first lens array and the second lens array It is characterized by providing a light control device for narrowing down.
[0007]
In the present invention as described above, the light emitted from the light source device passes through the first lens array and the second lens array, and the light control disposed between the first lens array and the second lens array. The amount of light in the optical path is adjusted by the device.
Therefore, since the light quantity of the light source device itself is not adjusted, any kind of light source device can be used. For example, a high-pressure mercury lamp can be used, and a halogen lamp or a metal halide lamp can also be used. In addition, since the light amount in the optical path is reduced by the light control device, a sufficient contrast can be obtained by adjusting the amount of the aperture.
[0008]
In the illumination optical device according to the aspect of the invention, the light control device adjusts the light amount in the optical path and the light shielding plate in which the plate surface is arranged along the light beam emitted from the first lens array without reducing the light amount. Thus, a configuration including a rotating device that rotates the light shielding plate is preferable.
In the invention having such a configuration, the amount of light in the optical path can be adjusted by rotating the light shielding plate by the rotating device. Therefore, since it is sufficient to prepare a light shielding plate and a device that rotates the light shielding plate, the configuration of the light control device can be simplified.
[0009]
Further, the light shielding plate has a rotation end portion located on the second lens array side, and a rotation center thereof away from the plate surface of the light shielding plate and in the optical path, and the first lens array. A configuration located on the side is preferred.
In the invention having such a configuration, the second lens array has a substantially conjugate relationship with the light source device, and the light shielding plate can sufficiently cover the surface of the second lens array by the rotation of the light shielding plate. The amount of light emitted from the apparatus is reliably reduced, and illumination unevenness does not occur.
[0010]
In the illumination optical device according to the present invention, it is preferable that the light shielding plates are arranged to face each other with an illumination optical axis in between.
In the invention of this configuration, the amount of light emitted from the light source device can be adjusted by covering the surface of the first lens array or the second lens array from both sides with a plurality of light shielding plates. There is no illumination unevenness.
[0011]
The light shielding plate preferably includes a heat sink.
In the invention of this configuration, the heat transmitted from the light source device to the light shielding plate during light shielding is released from the heat sink, so that it is possible to prevent the heat stored in the light shielding plate itself from returning to the periphery of the light source device. Therefore, it is possible to prevent a decrease in luminance and other problems associated with the heat stored in the light source device itself.
Further, the light shielding plate is preferably formed from aluminum or an aluminum alloy.
In the invention of this configuration, the heat generated at the time of light shielding can be positively taken into the light shielding plate, so that it can be prevented from returning to the periphery of the light source device also from this point.
[0012]
In the illumination optical device of the present invention, it is preferable that a cooling path for cooling the rotating device and the light shielding plate is formed.
In the invention of this configuration, heat stored in the rotating device or the light shielding plate is released to the outside through the cooling path, so that heat does not accumulate inside the illumination optical device. Therefore, also from this point, it is possible to prevent a decrease in luminance, a reduction in the lifetime of the internal device, and other problems associated with the heat stored in the light source device itself.
[0013]
In the illumination optical device according to the aspect of the invention, it is preferable that the rotation device includes a stepping motor connected to the light shielding plate.
In the invention of this configuration, since the stepping motor is controlled in response to a drive command, the rotational driving force of the controlled stepping motor is transmitted to the light shielding plate, so that the light shielding by the light shielding plate can be accurately performed. .
[0014]
In addition, a projector according to the present invention includes the illumination optical device having the above-described configuration.
In the present invention, since the type of the light source device is not limited, the design of the projector is not limited, and the contrast can be sufficiently obtained, so that the image quality of the projected image can be improved. it can.
[0015]
In the projector according to the aspect of the invention, it is preferable that the light control device adjusts a light amount to be reduced according to an input image signal.
In the invention of this configuration, by adjusting the amount of light according to the input image signal, the image is brightened by not reducing the amount of light in a scene of a bright image, and by reducing the amount of light in a scene of a dark image, the image is reduced. Can be made darker. Therefore, the sharpness of the image can be sharpened, and the image expression can be made dynamic.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a first embodiment will be described with reference to FIGS.
(1. Main configuration of projector)
1 is an overall perspective view of the projector 1 according to the present embodiment as viewed from above, FIG. 2 is an overall perspective view of the projector 1 as viewed from below, and FIG. 3 is an upper case 21 of the projector 1 from the state of FIG. FIG. 4 is a plan view schematically showing an optical system of the projector.
[0017]
1 to 4, a projector 1 includes an exterior case 2, a power supply unit 3 accommodated in the exterior case 2, a planar U-shaped optical unit 4 disposed in the exterior case 2, and an exterior case as well. 2 and an internal cooling unit 5 (see FIG. 5), and has a substantially rectangular parallelepiped shape as a whole.
[0018]
The exterior case 2 includes an upper case 21 and a lower case 23 each made of resin. These cases 21 and 23 are fixed to each other with screws.
The exterior case 2 is not limited to resin, but may be made of metal. Further, a part of the outer case can be made of resin, and the other part can be made of metal. For example, the upper case 21 may be made of resin, and the lower case 23 may be made of metal.
[0019]
The upper case 21 is formed by an upper surface portion 211, a side surface portion 212 provided around the upper surface portion 211, a back surface portion 213, and a front surface portion 214.
On the front side of the upper surface portion 211, a lamp cover 24 is fitted and detachably attached. Further, in the upper surface portion 211, a notch portion where the upper surface portion of the projection lens 46 as a projection optical system is exposed is provided on the side of the lamp cover 24. Thereby, the zoom operation and the focus operation of the projection lens 46 can be manually performed via the lever. An operation panel 25 is provided on the rear side of the notch.
[0020]
The side surface portion 212 is provided with a U-shaped handle 29 on one side surface (right side in FIG. 1) so as to be rotatable. Further, a side foot 2A (FIG. 2) is provided on the other side surface (right side in FIG. 2) as a foot when the projector 1 is stood with the handle 29 on the upper side.
[0021]
The back surface portion 213 is recessed inside the projector 1 and is provided with an interface portion 2B. An interface cover 215 is provided in the interface unit 2B, and an interface board (not shown) on which various connectors are mounted is disposed inside the interface cover 215.
In addition, speaker holes 2C and suction ports 2D are provided on the left and right sides of the interface portion 2B. The suction port 2D is located on the rear side of the internal power supply unit 3.
[0022]
The front portion 214 includes a round hole opening 212A that is continuous with the cutout portion of the upper case 21, and a projection lens 46 is disposed corresponding to the round hole opening 212A. In the front portion 214, a discharge port 212 </ b> B that discharges internal air to the outside via the internal cooling unit 5 is located on the side opposite to the round hole opening 212 </ b> A. The discharge port 212B is located on the front side of the internal power supply unit 3.
Further, the exhaust port 212B is provided with an exhaust louver 26 that exhausts the cooling air in a direction away from the image projection area, that is, the left side in FIG. 1, and also serves as a light shielding function.
[0023]
The lower case 23 is formed in a substantially plate shape, and places and fixes the power supply unit 3, the optical unit 4, and the internal cooling unit 5.
In FIG. 2, a position adjustment mechanism 27 that adjusts the inclination of the entire projector 1 and aligns the projected image is provided on the front side of the bottom surface portion 231 of the lower case 23.
Further, another position adjusting mechanism 28 for adjusting the inclination of the projector 1 in another direction is provided at one corner on the rear side of the bottom surface portion 231, and a rear foot 231A is provided at the other corner. . However, the position of the rear foot 231A cannot be adjusted.
Further, the bottom surface portion 231 is provided with an intake port 231B for cooling air.
[0024]
The power supply unit 3 includes a power supply (not shown) as a power supply block and a lamp drive circuit (ballast) (not shown) as a lamp drive block arranged on the side of the power supply.
The power supply supplies power supplied through the power cable to the lamp driving circuit, the driver board 90 (FIG. 3), and the like, and includes an inlet connector 33 (FIG. 2) into which the power cable is inserted.
The lamp driving circuit supplies power to the light source lamp 411 of the optical unit 4.
The driver board 90 drives and controls a liquid crystal panel 441 described later according to image information.
[0025]
These power supply and lamp drive circuit are arranged substantially in parallel, and the occupied space extends in the front-rear direction on the side of the projector 1.
In addition, the power supply and the lamp driving circuit are each surrounded by a cylindrical member that is opened on the left and right sides and plated on the surface, or has a metal vapor deposition process or a metal foil attached thereto. These cylindrical members have a function as a duct for guiding cooling air in addition to a function of preventing leakage of electromagnetic noise between the power source and the lamp driving circuit.
[0026]
As shown in FIG. 4, the optical unit 4 is a unit that optically processes the light beam emitted from the light source lamp 411 to form an optical image corresponding to the image information. The optical unit 4 includes an integrator illumination optical system 41 as an illumination optical device, a color separation optical system 42, a relay optical system 43, an electro-optical device 44, a cross dichroic prism 45, and a projection lens 46. Yes.
[0027]
FIG. 5 is a plan view showing the positional relationship among the power supply unit 3, the optical unit 4, and the internal cooling unit 5.
As shown in FIG. 5, the internal cooling unit 5 sucks external cooling air, introduces it into the projector 1, cools the internal heat generating member, and discharges the warmed air to the outside. The internal cooling unit 5 includes a pair of panel cooling sirocco fans 51 and 52 that mainly cool the electro-optical device 44 of the optical unit 4, and a lamp cooling sirocco fan 53 that mainly cools the light source lamp 411 (see FIG. 7). ), An axial fan 54 that sucks external cooling air and blows it to the power supply unit 3, and an exhaust fan 55 that discharges the air inside the projector 1 to the outside.
[0028]
The power supply unit 3, the optical unit 4, and the internal cooling unit 5 are covered with an aluminum shield plate 80 (FIG. 3), including the upper and lower sides. Noise leakage is prevented.
[0029]
(2. Detailed configuration of optical system)
In FIG. 4, the integrator illumination optical system 41 includes image forming regions of three liquid crystal panels 441 (respectively indicated as liquid crystal panels 441 R, 441 G, and 441 B for red, green, and blue color lights) constituting the electro-optical device 44. An optical system for illuminating substantially uniformly, a light source device 413, a first lens array 418, a second lens array 414 including a UV filter, a polarization conversion element 415, a first condenser lens 416, and a reflection mirror 424 and a second condenser lens 419.
[0030]
Among these, the light source device 413 includes a light source lamp 411 that emits a radial light beam and a reflector 412 that reflects the emitted light emitted from the light source lamp 411. As the light source lamp 411, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is often used. A parabolic mirror is used as the reflector 412. In addition to a parabolic mirror, an ellipsoidal mirror may be used together with a collimating lens (concave lens).
[0031]
The first lens array 418 is a fly-eye lens having a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source lamp 411 into a plurality of partial light beams. The contour shape of each small lens is set so as to be almost similar to the shape of the image forming area of the liquid crystal panel 441. For example, if the aspect ratio (ratio of horizontal and vertical dimensions) of the image forming area of the liquid crystal panel 441 is 4: 3, the aspect ratio of each small lens is also set to 4: 3.
[0032]
The second lens array 414 is a fly-eye lens having a configuration substantially similar to that of the first lens array 418, and has a configuration in which small lenses are arranged in a matrix. The second lens array 414 has a function of forming an image of each small lens of the first lens array 418 on the liquid crystal panel 441 together with the first condenser lens 416 and the second condenser lens 419.
The first lens array 418 has a substantially conjugate relationship with the light modulation device and the screen, and is disposed on the light source device 413 side.
The second lens array 414 has a substantially conjugate relationship with the light source device 413, and is disposed away from the light source device 413 and opposed to the first lens array 418. That is, the image point of the light source of the first lens array 418 is slightly shifted from the position of the second lens array 414 and is connected to the polarization conversion element 415.
A dimming device 480 is provided between the first lens array 418 and the second lens array 414 to reduce the amount of light in the optical path between them.
[0033]
The polarization conversion element 415 is disposed between the second lens array 414 and the first condenser lens 416 and is unitized with the second lens array 414. Such a polarization conversion element 415 converts the light from the second lens array 414 into a single type of polarized light, thereby improving the light use efficiency in the electro-optical device 44.
[0034]
Specifically, each partial light converted into one type of polarized light by the polarization conversion element 415 is finally liquid crystal panels 441R, 441G, 441B of the electro-optical device 44 by the first condenser lens 416 and the second condenser lens 419. It is almost superimposed on the top. In a projector using a liquid crystal panel of a type that modulates polarized light, only one type of polarized light can be used. Therefore, almost half of the light from the light source lamp 411 that emits randomly polarized light cannot be used.
Therefore, by using the polarization conversion element 415, the light emitted from the light source lamp 411 is converted into almost one type of polarized light, and the light use efficiency in the electro-optical device 44 is enhanced. Such a polarization conversion element 415 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.
[0035]
The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the integrator illumination optical system 41 by the dichroic mirrors 421 and 422 are red, green, and blue. It has a function of separating into three color lights.
[0036]
The relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and has a function of guiding the color light and blue light separated by the color separation optical system 42 to the liquid crystal panel 441B.
[0037]
At this time, the dichroic mirror 421 of the color separation optical system 42 transmits the blue light component and the green light component of the light beam emitted from the integrator illumination optical system 41 and reflects the red light component. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 417, and is aligned in the polarization direction by the polarizing plate 442, and then reaches the liquid crystal panel 441R for red. The field lens 417 converts each partial light beam emitted from the second lens array 414 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 417 provided on the light incident side of the other liquid crystal panels 441G and 441B.
[0038]
Of the blue light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, and the polarization direction is aligned by the polarizing plate 442 through the field lens 417, and then the green light is applied to the liquid crystal panel 441G for green. Reach. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 417, and is aligned with the polarizing plate 442 to reach the blue light liquid crystal panel 441B. The reason why the relay optical system 43 is used for blue light is that the optical path length of the blue light is longer than the optical path lengths of the other color lights, thereby preventing a reduction in light use efficiency due to light diffusion or the like. Because. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 417 as it is.
[0039]
The electro-optical device 44 includes liquid crystal panels 441R, 441G, and 441B as three light modulation devices. The liquid crystal panels 441R, 441G, and 441B use, for example, polysilicon TFTs as switching elements. Each color light separated by the color separation optical system 42 is incident on the liquid crystal panels 441R, 441G, and 441B and their luminous fluxes. An optical image is formed by being modulated according to image information by the polarizing plates 442 on the side and the exit side.
[0040]
The cross dichroic prism 45 forms a color image by combining images modulated for each color light emitted from the three liquid crystal panels 441R, 441G, and 441B. In the cross dichroic prism 45, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the dielectric multilayer film. The color image synthesized by the cross dichroic prism 45 is emitted from the projection lens 46 and enlarged and projected on the screen.
[0041]
The electro-optical device 44 and the cross dichroic prism 45 are integrated to form an optical device. FIG. 6 is a perspective view of the optical device as viewed from above.
The optical device includes a cross dichroic prism 45, a base 445 fixed to upper and lower surfaces of the cross dichroic prism 45 (a pair of end surfaces intersecting with a light beam incident end surface), liquid crystal panels 441R, 441G, 441B, and liquid crystal panels 441R. , 441G, 441B are integrally formed with a holding frame 443 and a holding member 446 interposed between the holding frame 443 and the side surface of the base 445.
[0042]
In FIG. 6, only one liquid crystal panel 441, one holding frame 443, and one holding member 446 are shown to simplify the drawing. These elements 441, 443, 446 are actually arranged on the other two light beam incident end faces of the cross dichroic prism 45.
[0043]
As shown in FIG. 7, the optical systems 41 to 45 described above are accommodated in an optical component casing 47 made of synthetic resin as a casing for an optical component formed in a substantially U-shape. Yes.
Here, the optical component casing 47 is formed of a metal such as aluminum, magnesium, or titanium, an alloy thereof, or a resin such as polycarbonate, polyphenylene sulfide, or liquid crystal resin containing a carbon filler.
[0044]
This optical component housing 47 is a slide type polarizing plate 442 arranged on the light incident side of each of the optical components 414 to 419, 421 to 423, 431 to 434 and the liquid crystal panels 441R, 441G and 441B. The lower casing 471 is provided with a groove portion to be fitted into the upper casing 471, and a lid-shaped upper casing 472 that closes the upper opening side of the lower casing 471.
A head portion 49 is formed on the light emission side of the optical component casing 47. The projection lens 46 is fixed to the front side of the head portion 49, and the above-described optical device is fixed to the rear side.
[0045]
(3. Configuration of internal cooling unit and cooling structure)
In FIG. 5, the panel cooling sirocco fans 51 and 52 are arranged to face both sides of the projection lens 46. The panel cooling sirocco fans 51 and 52 mainly cool the three liquid crystal panels 441 of the electro-optical device 44 and function as a panel cooling system A (see FIG. 2).
In the panel cooling system A, first, as shown in FIG. 2, the panel cooling sirocco fans 51 and 52 suck the cooling air from the intake port 231B on the lower surface. The cooling air cools the liquid crystal panels 441R, 441G, and 441B and the polarizing plates 442 (FIG. 4) on the light incident and exit sides thereof from below to above. Thereafter, while cooling the lower portion of the driver board 90 (FIG. 3), the cooling air is drawn to the exhaust fan 55 side at the front corner and exhausted from the front-side discharge port 212B (FIG. 1).
[0046]
As shown in FIG. 7, the lamp cooling sirocco fan 53 is provided on the lower surface of the optical unit 4, and an optical path surface (an optical component housing) on which the air inlet of the lamp cooling sirocco fan 53 is formed by the optical unit 4. 47 along the upper surface or the lower surface). The lamp cooling sirocco fan 53 mainly cools the light source lamp and functions as a lamp cooling system B.
[0047]
In the lamp cooling system B, the lamp cooling sirocco fan 53 first draws the cooling air in the projector 1. Then, the drawn cooling air enters the optical component casing 47 through an opening (not shown) provided in the upper casing 472, and the second lens array 414 (FIG. 4) and the polarization conversion element 415 (FIG. 4). ) To cool them.
[0048]
Further, as shown in FIG. 7, the lamp cooling sirocco fan 53 sucks the cooling air from the exhaust side opening 471A of the lower housing 471. Then, the lamp cooling sirocco fan 53 again discharges cooling air into the optical component casing 47 from the intake side opening 471B of the lower casing 471. The discharged cooling air enters the light source device 413 to cool the light source lamp 411 (FIG. 4), and then exits from the optical component casing 47 and is discharged by the exhaust fan 55 to the discharge port 212B. Exhaust from (FIG. 1).
[0049]
As shown in FIG. 5, the axial fan 54 is located behind the power supply unit 3 and is disposed to face the suction port 2 </ b> D (see FIG. 2) on the back side. The axial fan 54 mainly cools the power supply unit 3 and functions as a power supply cooling system.
The exhaust fan 55 is close to the light source device 413 of the optical unit 4, and the intake port of the exhaust fan 55 is along a plane orthogonal to the optical path surface formed by the optical unit 4, that is, the thickness of the projector 1. Arranged along the direction.
With such a configuration, the exhaust fan 55 is warmed by the cooling system, and the air accumulated in the projector 1 is separated from the projection direction of the projector 1 via the front-side discharge port 212B (FIG. 1). Discharge to the outside.
[0050]
(4. Configuration of light control device)
8 to 14 show a specific configuration of the light control device 480. FIG.
8 is a perspective view showing a state in which the light control device 480 is mounted on the light guide of the optical unit 4, FIG. 9 is a schematic configuration diagram of the light control device 480, and FIG. 10 is a perspective view of the light control device 480. It is.
In these drawings, the light control device 480 includes two light shielding plates 481 that block the light beam that has passed through the first lens array 418 from the light source device 413, a rotating device 482 that rotates the light shielding plates 481, respectively. This configuration includes a cooling path 483 for cooling the rotating device 482 and the light shielding plate 481, and a control device 484 for controlling the rotating operation of the rotating device 482.
[0051]
As shown in FIG. 9, the light shielding plates 481 are arranged to face each other across the illumination optical axis, and each include a flat plate portion 481A and arm portions 481B attached to both ends of the flat plate portion 481A. . A rotation center 481C provided on the arm portion 481B is separated from the plate surface of the light shielding plate 481 and is located in the optical path and on the first lens array 418 side. The rotating end of the light shielding plate 481 is located on the second lens array 414 side. Therefore, the light shielding plate 481 is disposed along the light beam emitted from the first lens array 418 in a state where the light amount is not reduced, and the rotation end portion of the light shielding plate 481 is within a predetermined range along with the rotation. Will move along.
As shown in FIG. 11, when the rotation angle of the light shielding plate 481 is α, the rotation angle α and the brightness of the light beam passing through the light control device 480 are in the relationship shown in the graph of FIG.
[0052]
In FIG. 10, the light shielding plate 481 is formed from aluminum or an aluminum alloy, and the flat plate portion 481A includes a heat sink 481D including a plurality of concave and convex grooves formed in parallel to each other on the outer surface thereof.
A black paint or the like is applied to the back surface side of the flat plate portion 481A in order to absorb the light flux and prevent irregular reflection.
In FIG. 10, the rotating device 482 includes a stepping motor 482A connected to one arm portion 481B of each of the two light shielding plates 481. In the first embodiment, the rotating device 482 is illustrated in FIG. As described above, the rotation device 482 may include a single stepping motor 482A and a gear mechanism 482B connected to the stepping motor 482A and configured to rotate the two light shielding plates 481 in opposite directions. The other arm portion 481B of the two light shielding plates 481 is rotatably fixed to the light guide. The arm portions 481B facing each other are spaced so as not to block the light beam. The stepping motor 482A is located below the power supply unit 3 (see FIG. 5).
[0053]
In FIG. 8, a cooling path 483 includes a flow path that reaches between the light shielding plates 481 through an opening formed in the light guide in the vicinity of the light control device 480 and a cooling path disposed on the upstream side of the flow path. And a fan 483A.
The cooling fan 483A is a sirocco fan that sucks air from the outside of the projector 1 and blows out air toward the light control device 480, and after the cooling air sent to the stepping motor 482A is supplied to the light shielding plate 481 through the opening. Then, it is discharged to the outside by the exhaust fan 55 (see FIG. 5).
[0054]
A specific configuration of the control device 484 is shown in FIG.
In FIG. 13, the control device 484 controls the amount of light to be reduced by the rotation device 482 and the input voltage to the liquid crystal panel 441 in accordance with the input image signal received from the video terminal 484A, and the video signal is input from the video terminal 484A. Received image analysis circuit 484B, resize circuit 484C and CPU 484D for inputting signals from image analysis circuit 484B, gain adjustment circuit 484E for inputting signals from resize circuit 484C and CPU 484D, and signals from CPU 484D, respectively. A motor drive circuit 484F that drives and controls the stepping motor 482A of the rotation device 482, a lamp driver 484G and a fan drive circuit 484H that receive and drive signals from the CPU 484D, respectively, are provided.
[0055]
The image analysis circuit 484B transmits a signal of the rotation angle α of the light shielding plate 481 to the motor drive circuit 484F via the CPU 484D based on the video signal per frame input from the video terminal 484A. For example, the input signal is converted with the average degree of image modulation such as the average dot of one frame or the average of four corners of one frame.
The resizing circuit 484C is for correcting a trapezoidal distortion (keystone distortion) having a trapezoidal shape enlarged in the horizontal direction on the upper edge side of the optical image.
The gain adjustment circuit 484E adjusts the γ characteristic representing the gradation of the display image with respect to the input voltage to the liquid crystal panel 441 that forms the image.
The fan drive circuit 484H receives a temperature signal from a temperature sensor 484I provided in the cooling path 483 via the CPU 481D, and controls driving of the cooling fan 483A according to the temperature of the cooling path 483.
[0056]
(5. Effects of the embodiment)
According to this embodiment as described above, the following effects are obtained.
(1) An adjustment is made to reduce the amount of light in the optical path between the first lens array 418 and the second lens array 414 disposed opposite to the first lens array 418 and having a substantially conjugate relationship with the light source device 413. Since the light device 480 is provided, it is not necessary to adjust the light amount of the light source lamp 411 when adjusting the light amount. Therefore, a high pressure mercury lamp, a halogen lamp, or a metal halide lamp can be used as the light source lamp 411. In addition, since the light amount in the optical path is reduced by the light control device 480, a sufficient contrast can be obtained by adjusting the amount of the stop.
[0057]
(2) Since the light control device 480 includes the light shielding plate 481 and the rotation device 482 that rotates the light shielding plate 481 so as to adjust the amount of light in the optical path, the light shielding plate 481 is configured by the rotation device 482. The amount of light in the optical path can be adjusted by rotating the, so that the configuration of the light control device 480 can be simplified.
[0058]
(3) The light control device 480 is located on the first lens array 418 side in the optical path away from the plate surface of the light shielding plate 481 with the rotational center of the light shielding plate 481, and the rotational end portion of the light shielding plate 481. Since the second lens array 418 is positioned on the second lens array 414 side, the second lens array 418 is substantially conjugate with the light source lamp 411, and the surface of the second lens array 414 is sufficiently covered by the light shielding edge by the rotation of the light shielding plate 481. Since it can be covered, the amount of light emitted from the light source lamp 411 is reliably reduced, and illumination unevenness does not occur.
FIG. 14 shows a schematic diagram of an image. In FIG. 14, the dark portion of the image is described in detail with hatches (hatched lines), and the thin portion is formed rough. As shown in FIG. 14, in the first embodiment, there is no uneven illumination because there is no large shading in the image.
Furthermore, in the first embodiment, the light amount can be changed from 100% to 25% by changing the rotation angle α of the light shielding plate 481 from 0 degree to 56 degrees. Therefore, the amount of light changes to ¼, so that the contrast can be increased four times.
[0059]
(4) Since the two light shielding plates 481 are arranged opposite to each other with the optical axis in between, the light shielding plate 481 covers the surface of the second lens array 414 from both sides, and is emitted from the light source lamp 411. Since the amount of light can be adjusted efficiently, illumination unevenness does not occur from this point.
[0060]
(5) Since the light shielding plate 481 includes the heat sink 481D, the heat transmitted from the light source lamp 411 to the light shielding plate 481 is emitted from the heat sink 481D during light shielding, so the heat stored in the light shielding plate 481 itself is used as the light source. Returning to the periphery of the device 413 can be prevented. Therefore, it is possible to prevent a decrease in luminance due to heat stored in the light source device itself. In addition, since the heat storage of the light shielding plate 481 is not transmitted to the liquid crystal panel 441, the life of the liquid crystal panel 441 can be extended.
(6) Since the heat sink 481D is formed of a plurality of concave and convex grooves that are parallel to each other, the structure of the heat sink 481D can be simplified.
[0061]
(7) Since the light shielding plate 481 is formed from aluminum or an aluminum alloy, the heat generated during the light shielding can be positively taken into the light shielding plate 481. From this point as well, the light source device 413 and the liquid crystal panel 441 are heated. Is prevented from being transmitted.
(8) Since the cooling path 483 for cooling the rotating device 482 and the light shielding plate 481 is formed, the heat stored in the rotating device 482 and the light shielding plate 481 is forced to the outside through the cooling path 483. The heat is not trapped inside the projector 1 by being discharged into the projector. Therefore, also from this point, it is possible to prevent a decrease in luminance, a reduction in the lifetime of the liquid crystal panel 441, and other problems associated with heat storage inside the apparatus.
[0062]
(9) Since the rotation device 482 includes a stepping motor 482A coupled to the light shielding plate 481, the stepping motor 482A is controlled in response to a drive command, and therefore the rotational driving force of the controlled stepping motor 482A is controlled. By transmitting the light to the light shielding plate 481, light shielding by the light shielding plate 481 can be performed with high accuracy.
(10) If one stepping motor 482A is provided and the rotational driving force of this stepping motor 482A is transmitted to the two light shielding plates 481 via the gear mechanism 482B, the two light shielding plates 481 are synchronously controlled. Thus, not only can the light beam be accurately focused, but two stepping motors 482A that take up a relatively large space are not necessary, so that space can be saved and the apparatus can be downsized.
[0063]
(11) Since the projector 1 of the first embodiment is configured to include the integrator illumination optical system 41 (illumination optical device) having the above-described configuration, the design of the projector 1 is limited because the type of the light source lamp 411 is not limited. In addition, since sufficient contrast can be obtained, the image quality of the image projected by the projector 1 can be improved.
[0064]
(12) Since the light control device 480 includes the control device 484 that adjusts the light amount to be reduced according to the input image signal, the light amount is adjusted in the bright image scene by adjusting the light amount according to the input image signal. It is possible to make the image brighter by not squeezing it, and to darken the image by reducing the amount of light in a dark image scene. Therefore, the sharpness of the image can be sharpened, and the image expression can be made dynamic.
For example, when watching a movie or the like, a bright image is reproduced while keeping the light amount at 100% in a bright scene, and the light amount of the light source lamp 411 is instantly reduced to be a dark scene and simultaneously expanded to a corresponding video signal. Black in a dark scene can be darkened up to 1/4 as compared to black at 100%. For this reason, the wide dynamic range enables the reproduction of night sky gradations that could not be reproduced in the past, greatly improving the expressive power.
[0065]
(6. Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.
The second embodiment is different from the first embodiment in the configuration of the light control device 480, and the other configurations are the same as those in the first embodiment. In the description of the second embodiment, the same or similar components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.
15 and 16 show a schematic configuration of the light control device 480 of the second embodiment.
[0066]
In these drawings, the light control device 480 according to the second embodiment includes two light shielding plates 485 each having a rotation center located at an end, and two light shielding plates 485 that rotate in synchronization with each other. A stepping motor 482A is provided, and these stepping motors 482A are driven and controlled by the control device 484 as in the first embodiment.
The light control device 480 of 2nd Embodiment is provided with the cooling path 483 similarly to 1st Embodiment (refer FIG. 5 and FIG. 8).
[0067]
The light shielding plate 485 has a rotation center located on the second lens array 414 side and a rotation end located on the first lens array 418 side.
The light shielding plate 485 is formed from aluminum or an aluminum alloy, and a heat sink 481D is formed on the outer surface thereof.
[0068]
In 2nd Embodiment, there can exist an effect similar to (1) (2) (4)-(12) of 1st Embodiment.
In the second embodiment, there is illumination unevenness shown in the schematic diagram of FIG. In FIG. 17, it can be seen that there is a darker portion in the central portion as compared to FIG. 14 of the first embodiment. This is because, in the second embodiment, the light-shielding edge turns near the first lens array 418 until 40 degrees after the light-shielding plate 481 starts to rotate. Since the first lens array 418 has a substantially conjugate relationship with the liquid crystal panel 441 and the screen, if the amount of light is reduced near the first lens array 418, illumination unevenness appears on the screen.
However, the configuration of the second embodiment is sufficient when switching between two predetermined modes, for example, a mode in which the amount of light is 100% and a state in which the amount of light is 50%. On the other hand, when it is used for the purpose of increasing the contrast by dynamically adjusting the amount of light according to the video signal, it is necessary to perform multi-step adjustment of several tens of steps from 100% to 25%. The configuration of one embodiment is indispensable.
[0069]
(7. Modification of Embodiment)
Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
For example, in the above embodiment, the number of the light shielding plates 481 and 485 is two, but in the present invention, the number may be one or three or more. When using a plurality of three or more, the light shielding plates 481 and 485 are arranged at equal intervals around the optical axis.
Further, as a means for reducing the amount of light, not the light shielding plate but a mechanism for adjusting the amount of light by overlapping a plurality of plate members like a diaphragm mechanism of a camera may be used.
[0070]
In each of the above embodiments, the heat sink 481D is formed on the light shielding plates 481 and 485. However, in the present invention, the heat sink 481D may be omitted. Even if it is provided, it is not limited to the one formed from a plurality of concave and convex grooves as in the above embodiment, but other configurations, for example, a plurality of protrusions may be provided on the surfaces of the light shielding plates 481 and 485. Alternatively, the fins may be formed to protrude from the side surfaces of the light shielding plates 481 and 485.
Furthermore, the material of the light shielding plates 481 and 485 is not limited to aluminum or an aluminum alloy, and other members such as iron or plastic may be used as long as they have heat resistance.
[0071]
In the above-described embodiment, the optical component casing 47 is formed in a substantially U-shaped plane, but is not limited thereto. For example, it may be formed in a substantially L-shaped plane, or other shapes may be adopted. In the case where the plane is formed in an approximately L shape and the exhaust is performed from the projection side of the projector 1, a duct for guiding the air exhausted from the exhaust fan 55 to the exhaust port 212B is required.
[0072]
In the above-described embodiment, only an example of a projector using three light modulation devices has been described. However, the present invention is a projector using only one light modulation device, a projector using two light modulation devices, or 4 The present invention can also be applied to a projector using two or more light modulation devices.
In addition to applying the present invention to the projector 1, the lighting device may be used alone.
[0073]
In the above-described embodiment, the liquid crystal panel is used as the light modulation device. However, a light modulation device other than liquid crystal, such as a device using a micromirror, may be used.
In the above-described embodiment, the transmission type light modulation device having a different light incident surface and light emission surface is used. However, a reflection type light modulation device having the same light incident surface and light emission surface may be used. .
In the above embodiment, only an example of a front type projector that performs projection from the direction of observing the screen has been described, but the present invention is also applicable to a rear type projector that performs projection from the side opposite to the direction of observing the screen. Is possible.
[0074]
【The invention's effect】
According to the illumination optical device and the projector of the present invention, there are effects that the type of the light source device is not limited and sufficient contrast can be obtained.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a projector according to a first embodiment of the present invention as viewed from above.
FIG. 2 is an overall perspective view of the projector according to the first embodiment as viewed from below.
FIG. 3 is a perspective view showing the inside of the projector according to the first embodiment. Specifically, FIG. 3 is a view in which the upper case of the projector is removed from the state shown in FIG.
FIG. 4 is a plan view schematically showing an optical system of the projector in the first embodiment.
FIG. 5 is a plan view showing an arrangement relationship among a power supply unit, an optical unit, and an internal cooling unit.
FIG. 6 is a perspective view of the optical device according to the first embodiment viewed from above.
FIG. 7 is a perspective view of the optical unit according to the first embodiment viewed from below.
FIG. 8 is a perspective view showing a state in which the light control device is attached to the optical unit.
FIG. 9 is a schematic configuration diagram of a light control device.
FIG. 10 is a perspective view of the light control device.
FIG. 11 is a perspective view showing a rotation angle α of the light shielding plate.
FIG. 12 is a graph showing the relationship between the rotation angle α of the light shielding plate and the brightness of the light beam passing through the light control device.
FIG. 13 is a schematic configuration diagram of a control device.
FIG. 14 is a schematic diagram showing an image image projected in the first embodiment.
15 shows a light control device according to a second embodiment of the present invention, and is a schematic configuration diagram corresponding to FIG. 9. FIG.
FIG. 16 is a perspective view corresponding to FIG. 10, showing the light control device of the second embodiment.
FIG. 17 is a schematic diagram showing an image image projected in the second embodiment.
[Explanation of symbols]
1 Projector
4 Optical unit
41 Integrator illumination optical system (illumination optical device)
44 Electro-optical device
46 Projection lens
411 Light source lamp
413 Light source device
414 Second lens array
418 First lens array
441 LCD panel
480 Light control device
481 Shading plate
481A Flat plate
481B Arm
481C Center of rotation
481D heat sink
482 Rotating device
482A stepping motor
482B Gear mechanism
483 Cooling path
483A Cooling fan
484 Controller
484B Image analysis circuit
484C Resizing circuit
484D CPU
484E Gain adjustment circuit
484F Motor drive circuit
484G lamp driver
484H Fan drive circuit
484I Temperature sensor
485 Shading plate

Claims (10)

  1. A light source device, a light beam emitted from the light source device is divided into a plurality of partial light beams, and a first lens array disposed on the light source device side, opposed to the first lens array and substantially conjugate with the light source device An illumination optical device comprising a second lens array in relation,
    An illumination optical apparatus, wherein a dimming device is provided between the first lens array and the second lens array to reduce the amount of light in the optical path between them.
  2. The illumination optical apparatus according to claim 1,
    The light control device includes a light shielding plate having a plate surface arranged along a light beam emitted from the first lens array in a state where the light amount is not reduced, and a light shielding plate that adjusts the light amount in the optical path. An illumination optical apparatus comprising: a rotating device that moves.
  3. The illumination optical apparatus according to claim 2, wherein
    The light-shielding plate has a rotating end located on the second lens array side, and the center of rotation is away from the plate surface of the light-shielding plate and in the optical path and on the first lens array side. An illumination optical device characterized by being positioned.
  4. The illumination optical apparatus according to claim 2 or 3,
    An illumination optical apparatus, wherein a plurality of the light shielding plates are arranged opposite to each other with an illumination optical axis in between.
  5. The illumination optical apparatus according to any one of claims 2 to 4,
    The illumination optical device, wherein the light shielding plate includes a heat sink.
  6. The illumination optical apparatus according to any one of claims 1 to 5,
    2. The illumination optical device according to claim 1, wherein the light shielding plate is formed from aluminum or an aluminum alloy.
  7. The illumination optical apparatus according to any one of claims 2 to 6,
    An illumination optical device, wherein a cooling path for cooling the rotating device and the light shielding plate is formed.
  8. The illumination optical apparatus according to any one of claims 2 to 7,
    The illumination optical device according to claim 1, wherein the rotation device includes a stepping motor coupled to the light shielding plate.
  9. A projector comprising the illumination optical device according to claim 1.
  10. The projector according to claim 9, wherein
    The projector is characterized in that the light control device adjusts an amount of light to be reduced according to an input image signal.
JP2002228572A 2002-08-06 2002-08-06 Illumination optical device and projector provided with illumination optical device Expired - Fee Related JP4075509B2 (en)

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JP2005292764A (en) * 2004-09-09 2005-10-20 Nisca Corp Light quantity adjusting device and projector using the same
JP2005321584A (en) * 2004-05-10 2005-11-17 Hitachi Ltd Projection type image display device
JP2007047337A (en) * 2005-08-09 2007-02-22 Hitachi Ltd Projection-type video display device
JP2007086690A (en) * 2005-09-26 2007-04-05 Victor Co Of Japan Ltd Illumination optical system and projection type picture display device
JP2008193251A (en) * 2007-02-01 2008-08-21 Seiko Epson Corp Projection type display device, program, and information storage medium
JP2009015295A (en) * 2007-06-05 2009-01-22 Mitsubishi Electric Corp Projection display device
US7530695B2 (en) 2004-09-08 2009-05-12 Seiko Epson Corporation Projector
JP2009216906A (en) * 2008-03-10 2009-09-24 Seiko Epson Corp Dimmer, illuminator and projector
JP2010008767A (en) * 2008-06-27 2010-01-14 Hitachi Ltd Optical unit and projection type video display
JP2010038991A (en) * 2008-07-31 2010-02-18 Nidec Copal Corp Aperture device for projector
JP2010039078A (en) * 2008-08-01 2010-02-18 Nidec Copal Corp Diaphragm device for projector
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US20100188641A1 (en) * 2009-01-27 2010-07-29 Seiko Epson Corporation Projector
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CN101840142A (en) * 2009-03-18 2010-09-22 精工爱普生株式会社 Light modulating device and the lighting device that uses the projector of this light modulating device to use
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US8052285B2 (en) 2007-06-05 2011-11-08 Mitsubishi Electric Corporation Projection display having improved light shielding bodies for adjusting the amount of light applied to a light valve therein
JP2013047810A (en) * 2012-09-24 2013-03-07 Seiko Epson Corp Projector
US8398248B2 (en) 2009-02-18 2013-03-19 Seiko Epson Corporation Projector that operates in a brightness priority mode and in a contrast priority mode
US8425054B2 (en) 2005-08-09 2013-04-23 Hitachi, Ltd. Projection type image display apparatus
US8480236B2 (en) 2010-03-25 2013-07-09 Seiko Epson Corporation Having a light control unit
US8511836B2 (en) 2008-09-30 2013-08-20 Nidec Copal Corporation Diaphragm apparatus for projectors
US8783877B2 (en) 2008-09-25 2014-07-22 Hitachi Consumer Electronics Co., Ltd. Projection type display apparatus for displaying an image
US8801195B2 (en) 2009-10-27 2014-08-12 Seiko Epson Corporation Projector having a light shield unit with a countoured leading edge
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JP2005292764A (en) * 2004-09-09 2005-10-20 Nisca Corp Light quantity adjusting device and projector using the same
JP2007047337A (en) * 2005-08-09 2007-02-22 Hitachi Ltd Projection-type video display device
US9715167B2 (en) 2005-08-09 2017-07-25 Hitachi Maxell, Ltd. Projection type image display apparatus with light masking
US9383634B2 (en) 2005-08-09 2016-07-05 Hitachi Maxell, Ltd. Projection type image display apparatus with light masking unit having two light-masking plates to adjust light masking amount
US8727542B2 (en) 2005-08-09 2014-05-20 Hitachi Consumer Electronics Co., Ltd. Projection type image display apparatus with light masking
US8425054B2 (en) 2005-08-09 2013-04-23 Hitachi, Ltd. Projection type image display apparatus
US10048575B2 (en) 2005-08-09 2018-08-14 Maxell, Ltd. Projection type image display apparatus with light masking
JP2007086690A (en) * 2005-09-26 2007-04-05 Victor Co Of Japan Ltd Illumination optical system and projection type picture display device
JP2008193251A (en) * 2007-02-01 2008-08-21 Seiko Epson Corp Projection type display device, program, and information storage medium
US8052285B2 (en) 2007-06-05 2011-11-08 Mitsubishi Electric Corporation Projection display having improved light shielding bodies for adjusting the amount of light applied to a light valve therein
JP2009015295A (en) * 2007-06-05 2009-01-22 Mitsubishi Electric Corp Projection display device
US8684542B2 (en) 2007-06-05 2014-04-01 Mitsubishi Electric Corporation Projection display having improved light shielding bodies for adjusting the amount of light applied to a light valve therein
JP2009216906A (en) * 2008-03-10 2009-09-24 Seiko Epson Corp Dimmer, illuminator and projector
JP2010008767A (en) * 2008-06-27 2010-01-14 Hitachi Ltd Optical unit and projection type video display
JP2010038991A (en) * 2008-07-31 2010-02-18 Nidec Copal Corp Aperture device for projector
JP2010039078A (en) * 2008-08-01 2010-02-18 Nidec Copal Corp Diaphragm device for projector
JP2010039077A (en) * 2008-08-01 2010-02-18 Nidec Copal Corp Diaphragm device for projector
JP2010054610A (en) * 2008-08-26 2010-03-11 Nidec Copal Corp Diaphragm device for projector
US8783877B2 (en) 2008-09-25 2014-07-22 Hitachi Consumer Electronics Co., Ltd. Projection type display apparatus for displaying an image
US9304380B2 (en) 2008-09-25 2016-04-05 Hitachi Maxell, Ltd. Projection type display apparatus for displaying an image
US8511836B2 (en) 2008-09-30 2013-08-20 Nidec Copal Corporation Diaphragm apparatus for projectors
JP2010175589A (en) * 2009-01-27 2010-08-12 Seiko Epson Corp Projector
US20100188641A1 (en) * 2009-01-27 2010-07-29 Seiko Epson Corporation Projector
JP2010175679A (en) * 2009-01-28 2010-08-12 Seiko Epson Corp Projector
US8398248B2 (en) 2009-02-18 2013-03-19 Seiko Epson Corporation Projector that operates in a brightness priority mode and in a contrast priority mode
CN101840142B (en) * 2009-03-18 2012-05-30 精工爱普生株式会社 Light control device and illumination device for a projector including same
US8262233B2 (en) 2009-03-18 2012-09-11 Seiko Epson Corporation Light control device and illumination device for a projector including same
CN101840142A (en) * 2009-03-18 2010-09-22 精工爱普生株式会社 Light modulating device and the lighting device that uses the projector of this light modulating device to use
US8801195B2 (en) 2009-10-27 2014-08-12 Seiko Epson Corporation Projector having a light shield unit with a countoured leading edge
JP2010152373A (en) * 2010-01-28 2010-07-08 Seiko Epson Corp Projection display, program, and information storage medium
JP2011186109A (en) * 2010-03-08 2011-09-22 Seiko Epson Corp Projector
US8480236B2 (en) 2010-03-25 2013-07-09 Seiko Epson Corporation Having a light control unit
JP2013047810A (en) * 2012-09-24 2013-03-07 Seiko Epson Corp Projector
US9341931B2 (en) 2013-03-29 2016-05-17 Seiko Epson Corporation Projector and illumination device
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JP2014219493A (en) * 2013-05-07 2014-11-20 セイコーエプソン株式会社 Projector

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