JP2008139534A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of reducing the deterioration in the brightness and in color uneveness which occur later. <P>SOLUTION: The position of lamp body 21, with respect to a concave mirror 22, is adjusted by a position adjusting device in which a driving mechanism 26, a driving unit 97, a main control section 98, a key input section 99, or the like, operate cooperatively. This makes it possible to realign the lamp body 21, with respect to the concave mirror 22 so as to eliminate the displacement of the light-emitting part of the lamp body 21, caused later due to the use of the projector 10. Accordingly, the projector can suppress or recover from the deterioration the brightness of illuminating light, caused by the displacement of the light-emitting part of the lamp body 21 or the increase in the color uneveness, and can project high-quality images. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a projector that projects modulated light from a liquid crystal light bulb or the like illuminated by illumination light from a lamp light source.

A conventional general projector includes a light source that generates substantially white light, an illumination optical system that uniformizes and converts the light from the light source, and a color separation optical system that separates light that has passed through the illumination optical system into three colors. And three liquid crystal panels respectively illuminated by three colors of illumination light, a cross dichroic prism that synthesizes images from these three liquid crystal panels, and a projection lens that projects a magnified image after synthesis (for example, a patent) Reference 1). Here, the light source has a discharge arc tube such as a high-pressure mercury lamp and a reflector that collects light emitted from the discharge arc tube, and the discharge arc tube is fixed so that the light emitting part is located at the focal point of the reflector It has become.
JP 2004-69966 A

However, the discharge arc tube used in the projector is misaligned between the electrodes during re-lighting or lighting, and such misalignment gradually accumulates as the usage time increases. Increase. At the time of assembling the projector, the optical elements included in the illumination optical system arranged at the subsequent stage of the light source are adjusted by adjusting the optical axis of the optical system based on the initial position of the light emitting part of the discharge arc tube. The image tone is corrected so as to correct the color unevenness and illuminance unevenness of the light transmitted through the system. For this reason, when the position of the light emitting unit is shifted after assembly, for example, the taking-in of the light flux into the multi-lens or other optical element changes, and the brightness of the illumination light decreases.
Since the illuminance distribution changes for each color in the illumination region, the compatibility with the circuit-like correction at the time of assembly is lost, and subsequent color unevenness occurs in the projected image.

SUMMARY An advantage of some aspects of the invention is that it provides a projector capable of suppressing a subsequent decrease in brightness and an increase in color unevenness.

In order to solve the above problems, a projector according to the present invention includes: (a) a lighting device having a lamp body; and a reflector that reflects a light beam emitted from the lamp body and emits it as illumination light; and (b) an illumination device. A light modulation unit that is illuminated by illumination light from the device, (b) a projection optical system that projects image light that has passed through the light modulation unit, and (c) a position adjustment device that adjusts the relative position of the lamp body with respect to the reflector. Prepare.

In the projector, the position adjusting device adjusts the position of the lamp body with respect to the reflector, so that the lamp body is positioned with respect to the reflector so as to eliminate the positional deviation of the light emitting portion that occurs later with the use of the projector. Realignment can be performed. Thereby, the fall of the brightness of illumination light and the increase in color nonuniformity resulting from the position shift of a light emission part can be suppressed.

Further, according to a specific aspect or aspect of the present invention, in the projector, when adjusting the position of the lamp body, an adjustment image that makes the color unevenness of the projected image due to the projection optical system noticeable is formed in the light modulation unit. Adjustment image display means is further provided. In this case, it is possible to easily confirm the effect when the position adjusting device is operated to change the position of the lamp body. That is, it becomes easy to detect the position of the lamp body that can reduce the color unevenness of the adjustment image.

According to another aspect of the present invention, the position adjustment device generates a drive device that moves the lamp body in one or more directions and a signal for operating the drive device in response to a user operation. And an operation unit. In this case, since the user can change the position of the lamp body through the driving device only by operating the operation unit, the workability of realignment of the lamp body can be improved.

According to still another aspect of the present invention, an illuminance sensor that detects the illuminance of the projected image projected by the projection optical system is further provided. In this case, the achievement of alignment of the lamp body with respect to the reflector can be confirmed based on the output value of the illuminance sensor.

According to still another aspect of the present invention, color unevenness detecting means for detecting color unevenness of the projected image projected by the projection optical system is further provided. In this case, in this case, the achievement of the alignment of the lamp body with respect to the reflector can be confirmed based on the detection result of the color unevenness detection means.

According to still another aspect of the present invention, the image processing circuit further includes an image processing circuit that performs color correction on an image formed by the light modulation unit by performing signal processing on the input image signal. In this case, for example, color unevenness can be reduced by color correction of the projected image.

According to yet another aspect of the present invention, an image processing circuit that performs color correction on an image formed by the light modulator by performing signal processing on the input image signal, and color unevenness detection means And a control device that causes the image processing circuit to perform color correction to cancel the color unevenness distribution based on the color unevenness distribution. In this case, referring to the detection result by the color unevenness detection means after the final adjustment by the position adjusting device, color correction is performed so as to eliminate the color unevenness, so that there is less color unevenness while ensuring improvement in luminance. An image can be projected.

According to still another aspect of the present invention, the illuminating device further includes an optical integrator that divides the illumination light that has passed through the reflector into a plurality of partial luminous fluxes and causes the illumination light to enter the illuminated region. In this case, since the state of the light beam incident on the optical integrator can be restored to the initial state,
The uniform state of the illumination light can also be restored to the initial state, and an image with reduced brightness and less color unevenness can be projected.

According to still another aspect of the present invention, the light modulation section includes a light modulation device for each color that modulates each color light, and separates a light beam emitted from the illumination device into each color light to emit light for each color. An image light that is further provided with a color separation optical system that leads to the modulation device and a light combining optical system that combines the modulated light of each color modulated by the light modulation device for each color, and the projection optical system is combined by the light combining optical system Project. In this case, it is possible to project a color image obtained by combining the images of the respective colors formed by the light modulation device for a plurality of colors, and such a color image can appropriately maintain the alignment of the lamp body in the illumination device. High quality is maintained.

A projector adjustment method according to the present invention illuminates a light modulation unit with illumination light from an illumination device having a lamp body and a reflector, and projects image light that has passed through the light modulation unit. A step of causing the light modulation unit to perform a display that makes it possible to determine the color unevenness of the projected image, and a step of adjusting the position of the lamp body with respect to the reflector. According to this method,
Since the position of the lamp body is adjusted with respect to a lighting device or the like whose state of the lamp body has changed due to continued use after assembly, it is possible to suppress or recover a decrease in brightness of illumination light and an increase in color unevenness.

[First Embodiment]
FIG. 1 is a conceptual diagram illustrating a configuration of an optical system of a projector according to an embodiment of the present invention.

The projector 10 is an optical device for modulating a light beam emitted from a light source according to image information to form a color optical image and enlarging and projecting the optical image on a screen. The illumination optical system 30, the color separation device 40, the light modulator 60, the cross dichroic prism 70, and the projection optical system 80 are configured. Here, the light source lamp unit 20 and the illumination optical system 30 constitute an illumination device that generates illumination light to be supplied to the color separation device 40 and the like.

The light source lamp unit 20 is a light source device that collects and emits light emitted from the lamp body 21 to the surroundings and illuminates the light modulation unit 60 via the illumination optical system 30 and the like, and is a lamp body that is a light-emitting tube. 21, a concave mirror 22 that is a parabolic surface that reflects the light source light emitted from the lamp body 21, and a drive mechanism 26 that allows the lamp body 21 to be displaced with respect to the concave mirror 22 to enable alignment. In the light source lamp unit 20, the substantially white light source light emitted from the lamp body 21 is collimated through the concave mirror 22 that is a reflector, and emitted to the front side, that is, the illumination optical system 30 side. In addition, although the high-pressure mercury lamp is normally used for the lamp body 21 described above in that high-intensity light can be emitted over the wavelength of each color, the lamp that can be incorporated in the light source lamp unit 20 is: Not only a high pressure mercury lamp but it can be set as solid light emitting elements, such as LED. The concave mirror 22 is not limited to a paraboloid, and various concave mirrors such as an elliptical surface can be used. When an elliptical concave mirror is used, a parallel light beam can be emitted from the light source lamp unit 20 by providing the concave lens 23 and the like at the subsequent stage of the concave mirror 22.

In the light source lamp unit 20 described above, the drive mechanism 26 can displace the lamp body 21 two-dimensionally within a plane perpendicular to the system optical axis OA, and AB corresponding to the top and bottom of the paper surface.
A fine movement portion 26a in the direction and a fine movement portion 26b in the CD direction perpendicular to the paper surface. Both fine movement portions 26a and 26b can be manually operated. In this case, however, they are operated by an electric drive device described later. As described above, by appropriately finely moving the lamp main body 21 with respect to the concave mirror 22, it becomes possible to perform realignment so as to eliminate the positional shift of the arc light emitting portion of the lamp main body 21 with time. That is, the drive mechanism 26 has a role of enabling readjustment for returning the light beam state when the light beam emitted from the light source lamp unit 20 enters the first multi-lens 31 described later to the initial state.

The illumination optical system 30 divides the light beam emitted from the light source lamp unit 20 into a plurality of partial light beams and makes the illumination light uniform by superimposing it on a target illumination area and polarizing the illumination light in a specific direction. The first multi-lens 31, the second multi-lens 32, the polarization conversion device 34, and the superimposing lens 35 are provided.

The first multi-lens 31 is also referred to as a lens array, and has a function as a light beam splitting optical element that splits illumination light emitted from the lamp body 21 into a plurality of partial light beams.
A plurality of small lenses are arranged in a matrix in a plane orthogonal to A. The outline shape of each small lens is a liquid crystal display panel 61b, 61g that constitutes a light modulation unit 60 described later.
, 61r is set to be almost similar to the shape of the image forming area. The second multi-lens 32 is an optical element that condenses a plurality of partial light beams divided by the first multi-lens 31 described above, and in the same manner as the first multi-lens 31, a matrix is formed in a plane orthogonal to the system optical axis OA. The plurality of small lenses are arranged in a shape, but for the purpose of condensing, the contour shape of each small lens accurately corresponds to the shape of the image forming area of the liquid crystal display panels 61b, 61g, 61r. There is no need to be. The multi lenses 31 and 32 and the superimposing lens 35 described below function as an optical integrator for making illumination light uniform.

The polarization conversion device 34 is formed of a PBS array and a phase difference plate, and has a role of aligning the polarization direction of each partial light beam divided by the first multi-lens 31 with one direction of linearly polarized light.
Although detailed illustration of the PBS array of the polarization converter 34 is omitted, the system optical axis O
A configuration in which polarization separation films and reflection mirrors that are inclined with respect to A are alternately arranged.
The former polarization separation film transmits one polarized light beam among the P-polarized light beam and S-polarized light beam included in each partial light beam, and reflects the other polarized light beam. The reflected other polarized light beam is bent by the latter reflecting mirror, and is emitted in the emission direction of the one polarized light beam, that is, the direction along the system optical axis OA. One of the emitted polarized light beams is polarized and converted by a phase difference plate provided in a stripe shape on the light beam emission surface of the polarization conversion device 34, and the polarization directions of all the polarized light beams are aligned. By using such a polarization conversion device 34, the light beam emitted from the lamp body 21 can be aligned with a polarized light beam in one direction, so that the utilization factor of the light source light used in the light modulation unit 60 is improved. Can do.

The superimposing lens 35 condenses a plurality of partial light beams that have passed through the first multilens 31, the second multilens 32, and the polarization converter 34, and superimposes them on the image forming regions of the liquid crystal display panels 61b, 61g, 61r. Is an optical element. The light beam emitted from the superimposing lens 35 is emitted to the color separation device 40 at the next stage while being made uniform. In other words, the illumination light that has passed through both the multi-lenses 31 and 32 and the superimposing lens 35 passes through the color separation device 40 described in detail below, and the illumination area of the light modulation unit 60, that is, the liquid crystal display panels 61b, 61g, and 61r for each color Uniformly illuminate the image forming area.

The color separation device 40 includes first and second dichroic mirrors 41 a and 41 b and a reflection mirror 4.
2a, 42b, 42c, field lenses 43b, 43g, 43r, and relay lens 4
5 and 46. Among these, the first and second dichroic mirrors 41a and 41b constitute a color separation optical system for separating substantially white illumination light into three primary colors. Each dichroic mirror 41a, 41b is an optical element obtained by forming on a transparent substrate a dielectric multilayer film having a wavelength selection function of reflecting a light beam in a predetermined wavelength region and transmitting a light beam in another wavelength region. Yes, they are arranged in an inclined state with respect to the system optical axis OA. The first dichroic mirror 41a basically reflects the blue light LB among the three colors of blue, green, and red (B, G, and R), and transmits the green light LG and the red light LR. The second dichroic mirror 41b
Of the incident green light LG and red light LR reflects the green light LG and transmits the red light LR. As a result, the illumination light incident on the color separation device 40 from the light source lamp unit 20 through the illumination optical system 30 is reflected by the first dichroic mirror 41a and extends beyond the first optical path O.
The blue light LB guided to P1, the green light LG transmitted through the first dichroic mirror 41a, reflected by the second dichroic mirror 41b, and guided to the second optical path OP2 extending beyond the first dichroic mirror 41a, and the first and second dichroic mirrors It is separated into red light LR that passes through 41a and 41b and is guided to a third optical path OP3 that extends beyond it.

Field lenses 43b, 43g, 43 for each color provided on the emission side of the color separation device 40
r is provided so that each partial light beam emitted from the second multi-lens 32 and incident on the light modulation unit 60 has an appropriate degree of convergence. The pair of relay lenses 45 and 46 are disposed on the third optical path OP3 for red which is relatively longer than the first optical path OP1 for blue and the second optical path OP2 for green. The relay lenses 45 and 46 transmit the image formed immediately before the incident-side first relay lens 45 to the field lens 43r on the emission side as it is, so that light use efficiency due to light diffusion or the like is achieved. Is prevented.

The light modulation unit 60 includes three liquid crystal display panels 61b, 61g, and 61r on which illumination lights LB, LG, and LR of three colors are incident, respectively. Here, the liquid crystal display panel 61b for blue light LB and the pair of polarization filters 62b and 62b sandwiching the liquid crystal display panel 61b constitute a liquid crystal light valve for two-dimensionally modulating the luminance of illumination light based on image information. . The liquid crystal display panel 61g for green light LG and the pair of polarizing filters 62g and 62g sandwiching the liquid crystal display panel 61g also constitute a green liquid crystal light valve, and similarly, a pair of liquid crystal display panel 61r for red light LR and a pair. The polarizing filters 62r and 62r also constitute a red liquid crystal light valve. Each liquid crystal display panel 61b, 6
1g and 61r are liquid crystal which is an electro-optical material hermetically sealed between a pair of transparent glass substrates. For example, a polarized light beam incident on each of them according to a given image signal using a polysilicon TFT as a switching element. Modulate the polarization direction.

In the light modulation unit 60, the blue light LB guided to the first optical path OP1 is incident on the illumination area provided at the position of the liquid crystal display panel 61b via the field lens 43b and enters the image forming area in the liquid crystal display panel 61b. Illuminate. The green light LG guided to the second optical path OP2 enters the illumination area provided at the position of the liquid crystal display panel 61g via the field lens 43g and illuminates the image forming area in the liquid crystal display panel 61g. The red light LR guided to the third optical path OP3 enters the illumination area provided at the position of the liquid crystal display panel 61r via the first and second relay lenses 45 and 46 and the field lens 43r, and enters the liquid crystal display panel 61r. Illuminate the image forming area. Each of the liquid crystal display panels 61b, 61g, and 61r is a non-light-emitting and transmissive light modulation device for changing the spatial distribution of the polarization direction of incident illumination light. Each liquid crystal display panel 61b, 6
The color lights LB, LG, and LR incident on 1g and 61r are respectively transmitted to the liquid crystal display panels 61b and 61b.
The polarization state is adjusted in units of pixels in accordance with drive signals or control signals input as electrical signals to 61g and 61r. At that time, the polarization direction of the illumination light incident on the liquid crystal display panels 61g and 61r is adjusted by the polarizing filters 62b, 62g and 62r, and the liquid crystal display panels 61b, 61g and 61r are adjusted by the polarizing filters 62b, 62g and 62r. Modulated light having a predetermined polarization direction is extracted from the light emitted from 61r.

The cross dichroic prism 70 is a light combining optical system that forms a color image by combining optical images modulated for the respective color lights emitted from the polarization filters 62b, 62g, and 62r. The cross dichroic prism 70 has a substantially square shape in plan view in which four right angle prisms are bonded together, and a pair of dielectric multilayer films 71 and 72 intersecting in an X shape are formed at the interface where the right angle prisms are bonded to each other. Is formed. One first dielectric multilayer film 71 reflects blue light, and the other second dielectric multilayer film 72 reflects red light. The cross dichroic prism 70 reflects the blue light LB from the liquid crystal display panel 61b by the first dielectric multilayer film 71 and emits the green light LG from the liquid crystal display panel 61g to the first and second sides. The red light LR from the liquid crystal display panel 61r is secondly emitted and emitted straight through the dielectric multilayer films 71 and 72.
The light is reflected by the dielectric multilayer film 72 and emitted to the left in the traveling direction.

The image light combined by the cross dichroic prism 70 in this way is projected as a color image on a screen (not shown) at an appropriate magnification through a projection optical system 80 as a magnification projection lens.

FIG. 2 is a block diagram conceptually illustrating a circuit portion 90 and the like for controlling the operation of the projector 10 of FIG. The circuit portion 90 includes an image processing unit 92 which is an image processing circuit for performing necessary image processing on a signal such as a video signal input from the outside, and each liquid crystal display based on the output of the image processing unit 92 Panel drive unit 93 for driving panels 61b, 61g, 61r, illuminance sensor 94 for detecting the illuminance of the projected image by projector 10, image sensor 95 for capturing the projected image as image data, and image data captured by image sensor 95 The image evaluation circuit 96 that detects color unevenness from the light source, the drive device 97 that operates the drive mechanism 26 for the lamp body 21, the key input unit 99 that is operated by the user, and the overall control of these operations. A main control unit 98.

Among the circuit portions 90 described above, the image processing unit 92 is a unit for converting a video signal into a signal suitable for the operation of the panel driving unit 93, and an image correction circuit that appropriately performs correction processing on the input image signal. 92a. The image processing unit 92, that is, the image correction circuit 92 a performs various image processing such as gradation correction, color correction, color unevenness correction, and distortion correction on the video signal based on a command from the main control unit 98. In addition, when operating in the arc image position adjustment mode, the image processing unit 92 causes the liquid crystal display panels 61b, 61g, and 61r to form adjustment images that make the color unevenness of the projected image stand out regardless of the input image signal. Specifically, a uniform image of intermediate colors such as gray is formed on the liquid crystal display panels 61b, 61g, and 61r, and projected on a screen (not shown) via the projection optical system 80 of FIG.

The panel drive unit 93 generates a drive signal for adjusting the display state of each of the liquid crystal display panels 61b, 61g, 61r based on the image signal after image processing output from the image processing unit 92. Thereby, in response to the image signal output from the image processing unit 92, the liquid crystal display panel 61b,
An image (moving image or still image) as a transmittance distribution can be formed in each color liquid crystal light valve composed of 61g, 61r and the accompanying polarizing filters 62b, 62g, 62r.

The illuminance sensor 94 can detect the illuminance within an angle of view corresponding to the range of the image projected on the screen by the projection optical system 80. Specifically, when the projector 10 is set in the arc image position adjustment mode, the illuminance of the adjustment image projected on the facing screen is detected. When the lamp body 21 is accurately positioned with respect to the concave mirror 22 and close to the initial alignment state, the amount of the light source light taken into the illumination optical system 30 from the light source lamp unit 20 can be made sufficiently large. The amount of light detected by the illuminance sensor 94 that collects the light becomes close to the maximum. On the other hand, when the lamp body 21 is displaced with respect to the concave mirror 22, the illumination optical system 30 is moved from the light source lamp unit 20.
The light amount of the light source light taken into the light source decreases according to the degree of the positional deviation, and the light amount detected by the illuminance sensor 94 also decreases. Therefore, by monitoring the output of the illuminance sensor 94 while displacing the lamp body 21 via the driving device 97 and the driving mechanism 26, the lamp body 2
1 can be eliminated, and illumination light from the light source lamp unit 20 can be efficiently taken out to the illumination optical system 30.

The image sensor 95 and the image evaluation circuit 96 function as color unevenness detection means for detecting color unevenness in the projected image. The image sensor 95 can detect an image projected on the screen by the projection optical system 80, and the image data captured by the image sensor 95 is converted from the image data to the color unevenness data by the image evaluation circuit 96. Is converted to Here, the color unevenness data is data obtained by extracting the color unevenness component of the adjustment image projected on the screen by the image processing unit 92 operating in the arc image position adjustment mode. For example, when the adjustment image is an intermediate gray color, the color unevenness data can be distributed over the entire image of the three color component intensities shifted from gray for the adjustment image actually projected, Or it can be set as the numerical value which integrated distribution of such a color component intensity | strength. Lamp body 21
Is displaced with respect to the concave mirror 22, unevenness in the amount of light occurs for each color separated by the illumination optical system 30, and the distribution of the color component intensity output from the image evaluation circuit 96 becomes non-uniform, or The integrated value increases. Therefore, the lamp body 2 is monitored by monitoring the output of the image evaluation circuit 96 when the lamp body 21 is displaced via the drive device 97 and the drive mechanism 26.
1 can be eliminated, and light source light can be efficiently extracted from the light source lamp unit 20 to the illumination optical system 30.

The drive device 97 includes a motor, a drive circuit, and the like, and finely moves the lamp main body 21 two-dimensionally via the drive mechanism 26. That is, the drive device 97 can finely move the lamp body 21 to an arbitrary position based on an instruction from the main control unit 98. If the position of the lamp main body 21 is adjusted by the driving device 97, realignment is possible so as to eliminate the positional deviation of the light emitting portion of the lamp main body 21 with time.

The key input unit 99 is a user operation unit and functions as an input device for inputting a user instruction to the main control unit 98. The user can perform general adjustment of the projection state by the projector 10 by operating the key input unit 99. In addition, the user can operate the projector 10 in the arc image position adjustment mode by operating the key input unit 99, and can finely move the lamp body 21 via the driving device 97 and the driving mechanism 26. The key input unit 99 can be replaced with a remote control device having a similar function, or can be used in combination with such a remote control device.

The main control unit 98 controls the overall operation of the projector 10 as a control device, and is composed of a microcomputer and the like, and has a built-in storage unit 98a for holding various data necessary for the operation of the projector 10. . The storage unit 98a stores various programs for operating the projector 10 and appropriately maintains the operating state of the projector 10.

The main control unit 98 can operate the projector 10 in, for example, an arc image position adjustment mode. In this case, the main control unit 98 operates the image processing unit 92 as appropriate to prepare an adjustment image such as gray that makes the color unevenness of the projected image noticeable, and displays the adjustment image on the liquid crystal display panel 61b, Projection is performed on the screen via 61g and 61r. That is, the main control unit 98 constitutes an adjusted image display unit together with the image processing unit 92. At this time, the main controller 98
Displays the light quantity value acquired by operating the illuminance sensor 94, for example, in a corner of the projected image on the screen (or a display (not shown)) so as to be visible to the user. Further, the main control unit 98 operates the integrated value of the color component intensity captured by operating the image sensor 95 and the image evaluation circuit 96 and the color unevenness degree obtained by processing the integrated value, for example, the corner of the projected image on the screen (or not shown). Display)
In such a way that it is visible to the user. The main control unit 98 also has a key input unit 99 by the user.
And the drive device 97 is operated according to the key operation. As a result, the user can freely displace the lamp body 21 by a desired amount with respect to the concave mirror 22, and the lamp body 21 can be realigned. At this time, the light amount value and the color unevenness displayed so as to be visible at the corners of the projected image on the screen are indicators for confirming the adjustment degree. However, the user can also check the degree of occurrence and resolution of color unevenness by directly observing the projected image on the screen.

FIGS. 3A and 3B are diagrams for explaining realignment of the lamp main body 21. FIG. 3A shows a second state in the projector 10 in a normal state, that is, a state immediately after shipment.
A light beam LB incident on the multi-lens 32 and used for illumination is shown. In this case, the light beam LB is incident on each element lens 32a, which is a small lens, in a well-balanced manner, and almost no vignetting occurs. FIG. 3B shows a light beam LB that is incident on the second multi-lens 32 and used for illumination in the projector 10 in an arc-shifted state, that is, in a state in which the light emitting point in the lamp body 21 has shifted with time. Show. In this case, the misaligned light beam LB is incident on each element lens 32a, which is a small lens, and the vignetting is increased. As a result, the brightness and color unevenness of the projected image projected on the screen by the projector 10 become considerably large. For this reason, the projector 10 is operated in the arc image position adjustment mode, and the user re-aligns the lamp body 21 by the key operation as described above, so that the normal state as shown in FIG. be able to.

FIG. 4 is a flowchart illustrating a first operation example of the projector 10 according to the present embodiment. In this case, it is assumed that the projector 10 has started an operation in the arc image position adjustment mode in accordance with a user key operation or the like.

First, the main control unit 98 operates the image processing unit 92 as appropriate, blocks an external signal, and projects an adjustment image (step S11). That is, the main control unit 98 causes the image processing unit 92 to prepare an intermediate gray image between black and white, and the gray image is displayed on the liquid crystal display panels 61b, 61g,
61r and projected onto the screen via the projection optical system 80. At this time, the main control unit 98 displays, for example, the light amount value acquired by operating the illuminance sensor 94 at the corner of the projected image on the screen.

Next, the main control unit 98 allows the user to operate the key input unit 99 (step S1).
3). The main control unit 98 operates the driving device 97 according to the operation of the key input unit 99 to displace the lamp body 21 with respect to the concave mirror 22. For each such displacement, the main control unit 98 displays, for example, a new light amount value acquired by operating the illuminance sensor 94 while updating it in the corner of the projected image on the screen. Thereby, the user can freely displace the lamp body 21 with respect to the concave mirror 22, and if the lamp body 21 is displaced so that the illuminance of the projection image becomes maximum, the lamp body 21 is realigned. It becomes possible. Note that when the user operates the key input unit 99, not only can the light amount value detected by the illuminance sensor 94 be referred to as described above, but also color unevenness and increase / decrease in light amount can be visually observed on the projected image on the screen. Can also be confirmed.

Next, the main control unit 98 checks whether or not the correction that is the position adjustment of the lamp body 21 is completed by the key operation by the user (step S14). Until the correction is instructed by the user, the operation allowable state set in step S13 is maintained.

When the user gives an instruction to complete the correction, the main control unit 98 first stores the distribution of the color component intensities acquired by operating the image sensor 95 and the image evaluation circuit 96 in the storage unit 98a and The operation is prohibited and the lamp main body 21 is fixed, and the image processing unit 92 is switched from the adjustment image display state to the normal display for displaying an external signal (step S25).

Next, the main control unit 98 causes the image correction circuit 92a of the image processing unit 92 to perform color correction that cancels out the distribution of the color component intensity captured at the beginning of step S15 (step S16). This makes it possible to perform color correction that cancels out the color unevenness remaining after realignment of the lamp body 21. If another color correction is already performed by the image correction circuit 92a of the image processing unit 92, color correction in addition to the above color unevenness correction is also possible.

In the above description, corrective color correction is performed in step S16 so as to cancel out the color unevenness remaining after realignment. However, such corrective color correction is not always necessary, and the projector 10 is initially shipped. The color unevenness correction can be maintained as it is.

FIG. 5 is a flowchart illustrating a second operation example of the projector 10 according to the present embodiment. Also in this case, it is assumed that the operation in the arc image position adjustment mode is started.

First, the main control unit 98 operates the image processing unit 92 as appropriate, blocks an external signal, and projects a gray image as an adjustment image (step S11).

Next, the main control unit 98 appropriately operates the image processing unit 92 to stop the current color correction processing by the image correction circuit 92a (step S22). Specifically, the projector 10 in a state immediately after shipment is in a state in which the lamp main body 21 is optimally aligned with respect to the concave mirror 22, but the color unevenness remaining in the normal projection image cannot be completely eliminated. The remaining color unevenness is compensated by color unevenness correction in the image processing unit 92, and the projected image finally has almost no color unevenness. Here, by canceling such color unevenness correction, original color unevenness appears, and color unevenness observation in the arc image position adjustment mode is made more accurate.

Thereafter, as in the case of the second operation example of FIG. 4, the main control unit 98 performs the key input unit 99 by the user.
(Step S13), and it is confirmed whether or not the correction that is the position adjustment of the lamp body 21 is completed (step S14). When adjusting the position of the lamp body 21, the key input unit 99 can be operated using the output of the illuminance sensor 94 so that the illuminance of the projected image becomes maximum. Further, when the position of the lamp body 21 is adjusted, projection is performed using visual observation of the projected image on the screen, the integrated value of the color component intensity obtained by using the image sensor 95 or the like, and the color unevenness degree obtained by processing this. The key input unit 99 can also be operated so that the color unevenness of the image is minimized.

When the user gives an instruction to complete the correction, the main control unit 98 first stores the distribution of the color component intensities acquired by operating the image sensor 95 and the image evaluation circuit 96 in the storage unit 98a and The lamp body 21 is fixed by prohibiting the operation (step S15).

Next, the main control unit 98 causes the image correction circuit 92a of the image processing unit 92 to perform color correction that cancels out the distribution of the color component intensity captured at the beginning of step S15 (step S26). This makes it possible to perform color correction that cancels out the color unevenness remaining after realignment of the lamp body 21.

As is clear from the above description, according to the projector 10 of the above-described embodiment, the position of the lamp body 21 is adjusted by the position adjusting device in which the driving mechanism 26, the driving device 97, the main control unit 98, the key input unit 99, and the like cooperate. The position with respect to the concave mirror 22 can be adjusted. As a result, the lamp body 21 is realigned with respect to the concave mirror 22 so that the position of the light emitting portion (arc image) of the lamp body 21 that has moved later with the use of the projector 10 is returned to the original position at the time of assembly. An image processing unit 9 in which the uneven color of the illumination light transmitted through the optical system at the time of assembly is corrected in a circuit manner
The compatibility with the setting of 2 can be restored. Therefore, it is possible to suppress or recover a decrease in brightness of illumination light and an increase in color unevenness caused by a positional deviation of the light emitting portion of the lamp main body 21, and it is possible to project a high-quality image.

Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and can be implemented in various modes without departing from the gist thereof. Such modifications are also possible.

That is, in the above embodiment, the lamp main body 21 is moved by the drive mechanism 26 to the system optical axis O.
Although it is displaced two-dimensionally in a plane perpendicular to A, the lamp body 21 can also be moved in a direction along the system optical axis OA. Conversely, the lamp body 21 can be displaced only in a specific one-dimensional direction perpendicular or parallel to the system optical axis OA.

Moreover, in the said embodiment, although the key input part 99 by a user is assumed on the alignment of the lamp main body 21, the alignment of the lamp main body 21 can also be automated. In this case, the position of the lamp main body 21 where the light quantity of the illuminance sensor 94 is maximized or the image sensor 9 is moved while moving the driving mechanism 26 so as to scan the lamp main body 21.
If the position of the lamp body 21 is determined such that the integrated value of the color component intensities obtained by using 5 etc. is minimized, it is possible to easily suppress a decrease in luminance and an increase in color unevenness.

Moreover, in the said embodiment, although the lamp main body 21 is displaced, it replaces with this and the concave mirror 2 is replaced.
2 can also be displaced.

In the projector 10 of the above embodiment, the lamp body 2 of the light source lamp unit 20 is also used.
Although a high-pressure mercury lamp is used as 1, various lamps capable of obtaining substantially white illumination light can be used.

Further, in the projector 10 of the above-described embodiment, the illumination optical system 30 is replaced with the multi-lenses 31 and 3.
2, the polarization conversion device 34 and the superimposing lens 35, but the multi-lenses 31 and 32 can be omitted or replaced with a rod integrator.

In the above-described embodiment, the color separation of the illumination light is performed using the color separation device 40, and each color is modulated by the light modulation unit 60, and then the image of each color is synthesized by the cross dichroic prism 70. However, an image can also be formed by a single liquid crystal panel, that is, a liquid crystal light valve. The present invention can also be applied to a projector using two liquid crystal panels or a projector using four or more liquid crystal panels.

In this embodiment, an example in which the present invention is applied to a transmissive projector has been described. However, the present invention can also be applied to a reflective projector. Here, “transmission type” means that a light valve including a liquid crystal display panel or the like is a type that transmits light, and “reflection type” is a type that the light valve reflects light. It means that. Furthermore, the present invention can also be applied to the case where a projection image is formed by a light modulation device such as a micro mirror device.

Further, the present invention can be applied to a front projection type projector that projects from the side that observes the projected image, and a rear projection type projector that projects from the side opposite to the side that observes the projected image. In this case, a configuration in which the illuminance sensor 94 and the image sensor 95 are not provided is possible. However, when the illuminance sensor 94 and the image sensor 95 are provided, they are arranged on the front side of the screen away from the projector.

It is a top view for demonstrating the optical system of the projector of one Embodiment. It is a block diagram explaining the circuit part for controlling the projector of FIG. (A) And (B) is a figure explaining the realignment of a lamp main body. 3 is a flowchart for explaining an operation example of the projector in FIG. 1. 6 is a flowchart for explaining another operation example of the projector in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Projector, 20 ... Light source lamp unit, 21 ... Lamp main body, 22 ... Concave mirror, 23 ... Concave lens, 26 ... Drive mechanism, 26a, 26b ... Fine movement part, 30 ... Illumination optical system, 31, 32 ... Multi lens, 34 ... Polarization conversion device, 35 ... superimposing lens,
40 ... color separation device, 41a, 41b ... dichroic mirror, 60 ... light modulator,
61b, 61g, 61r ... liquid crystal display panel, 62b, 62g, 62r ... polarizing filter,
70: Cross dichroic prism, 80 ... Projection optical system, 90 ... Circuit part, 9
DESCRIPTION OF SYMBOLS 2 ... Image processing part, 92a ... Image correction circuit, 93 ... Panel drive part, 94 ... Illuminance sensor, 95 ... Image sensor, 96 ... Image evaluation circuit, 97 ... Drive apparatus, 98 ... Main control part,
99: Key input unit, LB, LG, LR: Illumination light, OA: System optical axis

Claims (9)

An illumination device having a lamp body and a reflector that reflects the light beam emitted from the lamp body and emits it as illumination light;
A light modulator that is illuminated by illumination light from the illumination device;
A projection optical system for projecting image light that has passed through the light modulator;
A position adjustment device for adjusting a relative position of the lamp body with respect to the reflector. The projector according to claim 1, further comprising an adjustment image display unit that causes the light modulation unit to form an adjustment image for conspicuous color unevenness of a projection image by the projection optical system when adjusting the position of the lamp body. The said position adjustment apparatus contains the drive device which moves the said lamp | ramp main body in the direction more than one dimension, and the operation part which generate | occur | produces the signal for operating the said drive device according to a user's operation. Item 3. The projector according to any one of Items 2 above. The projector according to any one of claims 1 to 3, further comprising an illuminance sensor that detects an illuminance of a projection image projected by the projection optical system. The projector according to any one of claims 1 to 4, further comprising color unevenness detection means for detecting color unevenness of a projected image projected by the projection optical system. The projector according to any one of claims 1 to 5, further comprising an image processing circuit that performs color correction on an image formed by the light modulation unit by performing signal processing on the input image signal. . By performing signal processing on the input image signal, based on the image processing circuit that performs color correction on the image formed by the light modulation unit, and the color unevenness distribution detected by the color unevenness detection unit, The projector according to claim 5, further comprising a control device that causes the image processing circuit to perform color correction that cancels the color unevenness distribution. The said illuminating device is further equipped with the light integrator which divides the illumination light which passed through the said reflector into a some partial light beam, and makes it superimpose and inject into an illuminated area.
The projector according to any one of the above. The light modulation unit has a light modulation device for each color that modulates each color light,
A color separation optical system that separates a light beam emitted from the illumination device into light of each color and guides it to the light modulation device for each color, and light combining optics that combines the modulated light of each color modulated by the light modulation device for each color System and further,
The projector according to any one of claims 1 to 8, wherein the projection optical system projects the image light combined by the light combining optical system.

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