JP2007208852A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector in which a black matrix is efficiently prevented from standing out. <P>SOLUTION: The projector periodically changes an image forming state of an image to be projected by moving back and forth a movable part 61 of a projection lens 6 along with a main optical axis. Thus, in a projected image, an excellent image forming state and an adverse image forming state ate periodically and alternately changed. Therefore, these projection images are time-integrated, so that a black matrix becomes blurred and pale and can be prevented from standing out. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector that enlarges and projects a light beam.

  Conventionally, a projector that makes a black matrix of a projected image projected from a liquid crystal display element inconspicuous is known (for example, see Patent Document 1).

  The device described in Patent Document 1 is a projection liquid crystal display device including a light source, a parabolic mirror, a liquid crystal display element, a projection lens, a parallel plate glass, and a rotation mechanism. In this liquid crystal display device, a parallel flat glass disposed between a liquid crystal display element and a projection lens is rotated and oscillated into a light beam by a rotation mechanism, and the optical axis is translated into the light beam, thereby making the black matrix inconspicuous. Has been adopted.

Japanese Patent Laid-Open No. 08-179259 (see pages 4 to 6, see FIGS. 1 to 4)

  By the way, in the conventional projection type liquid crystal display device as described in Patent Document 1, since the parallel flat glass is configured to rotate and vibrate, it moves only in one direction along the vibration direction of the projected image. Therefore, it is only possible to deal with the black matrix only in the vertical direction or the black matrix in the horizontal direction among the vertical and horizontal directions, and at least 2 in order to eliminate the black matrix in all directions in the vertical and horizontal directions. Two parallel flat glasses are required. Therefore, there is a problem that the loss of light corresponding to that amount becomes large. In addition, since the parallel flat glass is rotationally vibrated, that is, driven by a reciprocating motion by switching the rotational motion, energy loss at the time of switching the rotational motion becomes large, and mechanical efficiency becomes poor. Problem.

  In view of the above problems, an object of the present invention is to provide a projector that makes a black matrix inconspicuous efficiently.

  The projector according to the present invention is a projector that modulates a light beam emitted from an illumination optical system by a fixed pixel type display element and projects the light modulated light beam by a projection optical system. An imaging change means for periodically changing the imaging state of the projected image is provided.

  According to this aspect of the invention, the projector includes the imaging change means that periodically changes the imaging state of the image projected on the subsequent stage of the display element. As a result, the projected image is periodically divided into a state in which the image formation state is good (a state in focus) and a state in which the image formation state is slightly bad (a state in which the focus is slightly shifted). Change alternately. Here, when the focus is in focus, the black matrix is clearly displayed, and when the focus is slightly shifted, the image is blurred, so the black matrix is also blurred and thinned. Therefore, when the image formation state of such a projected image is periodically changed at a somewhat high speed and time integration is performed, the black matrix in a focused state is slightly out of focus. Since the black matrix is synthesized, the black matrix is blurred and thinned so that the black matrix can be made inconspicuous.

In the present invention, it is preferable that the imaging change means periodically moves at least one of the plurality of optical lenses constituting the projection optical system in the main optical axis direction.
According to the present invention, since the imaging change means periodically moves the plurality of optical lenses constituting the projection optical system in the principal axis direction, the focus of the projection image is periodically changed as described above. be able to. In addition, since the lens of the projection optical system is simply moved along the main optical axis, a complicated configuration is unnecessary and the configuration can be simplified. Further, since the optical lens constituting the projection optical system is used, a special optical member is unnecessary on the optical path, light loss can be suppressed, and the black matrix can be made inconspicuous efficiently.

In the present invention, the imaging change means is provided in a plane intersecting the main optical axis of the light beam, and has an optical element having a light beam transmission surface having a different refractive index, and the light beam passes through the optical element. Driving means for driving in the optical path.
According to the present invention, the imaging change means periodically drives the optical element having the light beam transmission surface in the optical path by the driving means. As a result, it is possible to periodically project the projection image that has passed through the light beam transmission surfaces having different refractive indexes. Therefore, if the projection is performed while periodically changing the imaging state at a relatively high speed and time integration is performed, the black matrix becomes blurred and thin, and can be made inconspicuous.

At this time, in the present invention, the optical element is provided to be rotatable around a rotation shaft provided outside the optical path, and extends in the radial direction from the rotation shaft and can be inserted into the optical path. Preferably, the light transmitting surface is provided, and the driving unit drives the optical element to rotate about the rotation axis.
According to the present invention, the optical element includes the light beam transmission surface extending in the radial direction from the rotation shaft provided outside the optical path, and the driving unit rotates the optical element. As a result, when the optical element is rotated at a constant speed by the driving means, it is possible to periodically pass the light beam transmission surfaces having different refractive indexes in the optical path. Therefore, the optical distance of the light beam periodically changes, and the image formation state of the projected image can be changed. Further, since the driving means only drives the optical element to rotate in a predetermined direction, it does not need to be reciprocated as in the prior art, and is mechanically efficient. Furthermore, since the configuration is such that the optical element is only rotated by the driving means, a complicated configuration is not required and the configuration can be simplified. Therefore, the black matrix can be made inconspicuous efficiently with a simple configuration.

On the other hand, in the present invention, the optical element is formed to have substantially the same diameter as the diameter of the light beam passing through the optical path, and is provided to be rotatable around a rotation axis provided inside the optical path. It is good also as a structure which equips at least one part with the said light beam transmission surface, and the said drive means rotationally drives the said optical element centering | focusing on the said rotating shaft.
According to this invention, the optical element provided with a light beam transmission surface in part is rotated in the optical path. As a result, it is possible to change the position where the light beam transmission surfaces having different refractive indexes are periodically arranged in the optical path, and change the imaging state by changing the optical distance of the light beam transmitted through the light beam transmission surface. Can be made. Therefore, similar to the above invention, the black matrix can be made inconspicuous efficiently with a simple configuration.

In the present invention, the imaging change means is provided in a plane intersecting the main optical axis of the light beam, and has an optical element having a diffusing surface for diffusing light; and Drive means for driving in the optical path that passes through.
Here, the diffusion surface may be, for example, a glass member with a diffusion film affixed thereto, or may have irregularities formed on the surface of the glass surface.
According to this invention, the imaging change means periodically drives the optical element having the diffusing surface in the optical path by the driving means. As a result, it is possible to periodically project the projection image that has passed through the diffusion surface. Therefore, if the projection is performed while periodically changing the imaging state at a relatively high speed and time integration is performed, the black matrix becomes blurred and thin, and can be made inconspicuous.

At this time, in the present invention, the diffusion surface is provided so as to be rotatable about a rotation shaft provided outside the optical path, and extends in a radial direction from the rotation shaft and can be inserted into the optical path. It is preferable that the drive unit rotates the optical element about the rotation axis.
According to this invention, the optical element is provided with a diffusing surface extending in the radial direction from a rotating shaft provided outside the optical path, and the drive means rotates the optical element. Accordingly, when the optical element is rotated at a constant speed by the driving means, the diffusion surface can be periodically passed through the optical path. Therefore, the light of the luminous flux is periodically diffused, and the imaging state of the projected image can be changed. In addition, since the driving unit only drives the optical element to rotate in a predetermined direction, it becomes mechanically efficient as in the above-described invention. Furthermore, since the configuration is such that the optical element is only rotated by the driving means, a complicated configuration is not required and the configuration can be simplified. Therefore, the black matrix can be made inconspicuous efficiently with a simple configuration.

On the other hand, in the present invention, the optical element is formed to have substantially the same diameter as the diameter of the light beam passing through the optical path, and is provided to be rotatable around a rotation axis provided inside the optical path. It is good also as a structure which equips at least one part with the said diffusing surface, and the said drive means rotationally drives the said optical element centering on the said rotating shaft.
According to this invention, the optical element partially provided with the diffusing surface is rotated in the optical path. Thereby, the position where the diffusing surface for periodically diffusing light in the optical path can be changed, and the imaging state can be partially changed. Therefore, similar to the above invention, the black matrix can be made inconspicuous efficiently with a simple configuration.

Further, in the present invention, the imaging change means includes an optical element whose refractive index changes according to an applied voltage, and a voltage control means that periodically changes the applied voltage applied to the optical element. It is good.
According to the present invention, an optical element such as a liquid crystal plate whose refractive index changes according to the applied voltage is provided, and the applied voltage applied to the optical element is periodically changed by the voltage control means. As a result, the refractive index of the optical element can be changed periodically, and the imaging state can be changed by periodically changing the optical distance in the same manner as in the above invention. Therefore, the black matrix can be made inconspicuous efficiently.

In the present invention, a plurality of the display elements corresponding to the light beams of a plurality of colors, and a color combining optical system that combines the light beams emitted from these display elements, the imaging change means includes the color changing means. It is preferable to periodically change the imaging state of the projected image by changing the state of the light beam that has passed through the combining optical system.
According to the present invention, the projector includes the display elements corresponding to light beams of a plurality of colors, for example, R (red), G (green), and B (blue), and the imaging change unit is emitted from these display elements. The state of the light beam that has passed through the color combining optical system for color-combining the received light beam is changed. That is, it is provided somewhere on the optical path after the color synthesis optical system. For this reason, it is not necessary to provide the imaging change means corresponding to each of the plurality of display elements, and it is only necessary to provide one image changing means at the subsequent stage of the color synthesis optical system, and the configuration can be simplified.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically showing an outline of the optical system of the projector according to the first embodiment of the invention. FIG. 2 is a diagram schematically showing the operation of the movable part constituting the projection lens, and is a diagram schematically showing the operation of the movable part constituting the projection lens. FIG. FIG. 5B is a diagram schematically showing a state where the movable part is separated from the optical device, and FIG. 6C is a state where the movable part is further separated from the optical device. FIG. FIG. 3 is a diagram schematically illustrating an operation of a projected image in a state where the movable part is driven. FIG. 3A schematically illustrates a projected image in a state where the movable part is brought close to the optical device. FIGS. 4A and 4B are diagrams schematically showing a projected image in a state where the movable portion is separated from the optical device, and FIG. 4C is a schematic view of the projected image in a state where the movable portion is further separated from the optical device. FIG.

[Projector configuration]
In FIG. 1, reference numeral 1 denotes a projector according to the present invention. The projector 1 modulates a light beam emitted from a light source in accordance with image information, and enlarges and projects it on a projection surface such as a screen. The projector 1 includes an integrator illumination optical system 2 as an illumination optical system, a color separation optical system 3, a relay optical system 4, an optical device 5, a projection lens 6 as a projection optical system, and an optical housing 10. And a control circuit section (not shown) as display control means. The optical housing 10 houses therein the integrator illumination optical system 2, the color separation optical system 3, the relay optical system 4, and the optical device 5.

  The control circuit unit is electrically connected to, for example, an external input unit such as a connector (not shown) formed on the projector 1, a control button (not shown) constituting a power button, a playback button, and the like, a power supply unit (not shown), and the like. . Then, an operation signal input from an external input unit, a control button, or the like is recognized, and power from the power supply unit is supplied to the integrator illumination optical system 2, the optical device 5, or the like. The control circuit unit controls the optical device 5 based on, for example, an image signal input from an external input unit, and controls to project an image based on the image signal. Further, the control circuit unit moves the movable unit 62 described later to change the image formation state of the projected image.

  The integrator illumination optical system 2 is an optical system for making the luminous flux emitted from the light source uniform in the illumination optical axis orthogonal plane. The integrator illumination optical system 2 includes a light source device 21, a first lens array 22, a second lens array 23, a polarization conversion element 24, and a superimposing lens 25.

  The light source device 21 includes a light source lamp 211 and a reflector 212. Then, the radial light flux emitted from the light source lamp 211 is reflected by the reflector 212 to become a substantially parallel light flux, and is emitted to the outside. In the present embodiment, a high-pressure mercury lamp is used as the light source lamp 211, and a parabolic mirror is used as the reflector 212. The light source lamp 211 is not limited to a high-pressure mercury lamp, and may be a metal halide lamp, a halogen lamp, or the like. Further, the reflector 212 is not limited to a parabolic mirror, and a configuration in which a collimating concave lens is disposed on an exit surface of a reflector made of an ellipsoidal mirror may be employed.

  The first lens array 22 has a configuration in which small lenses having a substantially rectangular outline when viewed from the illumination optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source lamp 211 into partial light beams and emits them in the direction of the illumination optical axis.

  The second lens array 23 has substantially the same configuration as the first lens array 22, and includes a configuration in which small lenses are arranged in a matrix. The second lens array 23 has a function of forming an image of each small lens of the first lens array 22 together with the superimposing lens 25 on a liquid crystal panel 51 as a fixed pixel type display element to be described later of the optical device 5. .

  The polarization conversion element 24 converts the light from the second lens array 23 into approximately one type of polarized light, thereby improving the light use efficiency in the optical device 5. Specifically, each partial light beam converted into approximately one type of polarized light by the polarization conversion element 24 is finally substantially superimposed on a liquid crystal panel 51 (to be described later) of the optical device 5 by the superimposing lens 25. In a projector using the liquid crystal panel 51 of a type that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the light flux from the light source lamp 211 that emits randomly polarized light is not used. For this reason, by using the polarization conversion element 24, the light beam emitted from the light source lamp 211 is converted into substantially one type of polarized light, and the light use efficiency in the optical device 5 is enhanced. Such a polarization conversion element 24 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.

  The color separation optical system 3 includes two dichroic mirrors 31 and 32 and a reflection mirror 33. The plurality of partial light beams emitted from the integrator illumination optical system 2 are separated into three color lights of red (R), green (G), and blue (B) by the two dichroic mirrors 31 and 32.

  The relay optical system 4 includes an incident side lens 41, a relay lens 42, and reflection mirrors 43 and 44. The relay optical system 4 has a function of guiding blue light, which is color light separated by the color separation optical system 3, to a blue light liquid crystal panel 51 described later of the optical device 5.

  At this time, in the dichroic mirror 31 of the color separation optical system 3, among the light beams emitted from the integrator illumination optical system 2, the blue light component and the green light component are transmitted, and the red light component is reflected. The red light reflected by the dichroic mirror 31 is reflected by the reflection mirror 33, passes through the field lens 45, and reaches a later-described red light liquid crystal panel 51. The field lens 45 converts each partial light beam emitted from the second lens array 23 into a light beam parallel to the central axis (principal light beam). The same applies to the field lens 45 provided on the light incident side of the other liquid crystal panel 51 for green light and blue light.

  Of the blue light and green light transmitted through the dichroic mirror 31, the green light is reflected by the dichroic mirror 32, passes through the field lens 45, and reaches a later-described green light liquid crystal panel 51. On the other hand, the blue light passes through the dichroic mirror 32, passes through the relay optical system 4, passes through the field lens 45, and reaches a later-described blue light liquid crystal panel 51.

  The relay optical system 4 is configured to pass blue light of the three color lights, but is not limited thereto, and may be configured to pass red light, for example.

  The optical device 5 modulates an incident light beam according to image information to form a color image (optical image), and enlarges and projects the formed color image. As shown in FIG. 1, the optical device 5 includes a liquid crystal panel 51 (a liquid crystal panel for red light 51R, a liquid crystal panel for green light 51G, and a liquid crystal for blue light as three fixed pixel type display elements). A panel 51B), an incident-side polarizing plate 52 and an optical conversion plate 53 that are disposed opposite to the light incident side and the light emitting side of the liquid crystal panel 51, a cross dichroic prism 54 as a color combining optical system, Is provided. Of these, the three liquid crystal panels 51, the three optical conversion plates 53, and the cross dichroic prism 54 are integrated by a holding frame and a holding member (not shown) and attached to the optical housing 10.

  The incident-side polarizing plate 52 receives each color light whose polarization direction is aligned in substantially one direction by the polarization conversion element 24, and is substantially the same as the polarization axis of the light beam aligned by the polarization conversion element 24 among the incident light beams. Only polarized light in the direction (first polarization direction) is transmitted, and other light beams are absorbed. Although not shown, the incident-side polarizing plate 52 has a configuration in which a polarizing film is attached to a translucent substrate. Moreover, you may employ | adopt the structure which affixes a polarizing film on the field lens 45, without using a translucent board | substrate.

  Although not shown, the liquid crystal panel 51 is configured by laying a plurality of rectangular panel members, and liquid crystal, which is an electro-optical material, is hermetically sealed in these panel members. Then, the alignment state of the liquid crystal of each panel member is controlled according to the image signal output from the control circuit unit, and the polarization direction of the polarized light beam emitted from the incident side polarizing plate 52 is modulated. Each panel member of the liquid crystal panel is surrounded by, for example, a grid-like wiring, and is shielded from light by the grid-like wiring portion. Thus, when light is transmitted through the liquid crystal panel 51, as shown in FIG. 3B, each pixel 71 is formed by image light that is transmitted through each panel member and light-modulated, and surrounds these pixels 71. Thus, the black matrix 72 which is a part shielded from light by the wiring part is formed.

The optical conversion plate 53 includes a first optical conversion plate 53A (not shown) and a second optical conversion plate 53B (not shown).
The first optical conversion plate has substantially the same configuration as that of the incident-side polarizing plate 52 described above, and transmits only polarized light in a predetermined direction (second polarization direction) out of incident light beams, and transmits other light beams. Absorb. The second optical conversion plate transmits only polarized light in a predetermined direction among the light beams emitted from the liquid crystal panel 51, absorbs other light beams, and expands the viewing angle of the light beams emitted from the liquid crystal panel 51. .

  The cross dichroic prism 54 combines the red light, the blue light, and the green light incident from the optical conversion plate 53 to form a color image and emits it to the projection lens 6.

The projection lens 6 is provided so as to face an opening provided on one surface of the optical housing 10, and a tip portion is disposed so as to be exposed from an exterior case (not shown) of the projector 1, and is formed by a cross dichroic prism 54. Enlarge and project a color image. The projection lens 6 includes a cylindrical lens barrel main body 61 and a movable portion 62 as an imaging change means provided on the distal end side of the lens barrel main body 61. A plurality of optical lenses are housed in the lens barrel main body 61 and the movable portion 62 to form a combined lens.
The movable part 62 includes a driving device (not shown). This drive device advances and retracts the movable portion 62 along the main optical axis direction as shown in FIGS. 2A to 2C under the control of the control circuit portion. In FIG. 2, when the movable portion 62 is positioned in the state (B), the image light emitted from the cross dichroic prism 54 is projected so as to be in an excellent image formation state, that is, in a focused state. The On the other hand, as shown in FIG. 2 (A), when the movable portion 62 moves to a state close to the optical device 5 side, and as shown in FIG. 2 (C), it moves to a state separated from the optical device 5. At this time, the image formation state is slightly deteriorated, and the image light is projected with the focus slightly shifted.

[Projector operation and effects]
Next, operations and effects of the projector 1 will be described with reference to the drawings. FIG. 4 is a diagram schematically showing an enlarged display of a time-integrated projection image.

When the projector 1 is driven, first, the control circuit unit drives the light source device 21 of the integrator illumination optical system 2 to emit illumination light along the main optical axis. The light emitted from the integrator illumination optical system 2 is separated into three colors of red light, blue light, and green light by the color separation optical system 3 and the relay optical system 4, and is applied to the liquid crystal panel 51 of the optical device 5. Incident.
Here, the control circuit unit appropriately changes the alignment state of the liquid crystal of each panel member of the liquid crystal panel 51 according to the input image signal. The light modulated by the liquid crystal panel 51 enters the cross dichroic prism 54. In the cross dichroic prism 54, the color lights incident from the liquid crystal panels 51 of the respective colors are combined to generate image light, which is emitted to the projection lens 6.

  Further, the control circuit unit controls the driving device to move the movable unit 62 of the projection lens 6 forward and backward in the main optical axis direction as shown in FIGS. Therefore, as shown in FIGS. 3A to 3C, the image projected from the projection lens 6 is alternately displayed in a focused state and a slightly out of focus state. In other words, when the movable portion 62 is in the state shown in FIG. 2B, the image formation state of the projected image is good, and a projected image in focus as shown in FIG. 3B is projected. On the other hand, when the movable portion 62 is in the state shown in FIG. 2A and the state shown in FIG. 2C, the image formation state of the projected image deteriorates, as shown in FIGS. 3A and 3C. The projected image with the focus slightly shifted is projected.

  Here, the control circuit unit periodically moves the movable unit 62 forward and backward at a moving cycle of 60 Hz or more, for example. For this reason, when the projected image is time-integrated, as shown in FIG. 4, the projected image that is in focus and the projected image that is slightly out of focus are combined, and the black matrix 72 is not noticeable. An image can be displayed.

  In addition, as described above, the movable portion 62 is advanced and retracted, and any one of the plurality of optical lenses constituting the combined lens of the projection lens 6 is advanced and retracted, so that the black matrix 72 is eliminated. This new optical member becomes unnecessary, light loss can be suppressed, and the black matrix 72 can be made inconspicuous efficiently.

  Further, since the movable portion 62 is provided in the projection lens 6 disposed at the subsequent stage of the cross dichroic prism 52 so as to change the state of the light beam that has passed through the cross dichroic prism 54, the light emitted from the liquid crystal panel 51 is changed. There is no need to provide an imaging change means for each, and the black matrix 72 can be eliminated with a simple configuration.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings. In the following description, the same structure and the same member as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified. FIG. 5 is a diagram schematically showing an optical system of the projector according to the second embodiment. FIG. 6 is a perspective view schematically showing the configuration of the imaging change means of the second embodiment. FIG. 7A is a diagram schematically illustrating a projected image in a state where a glass plate is inserted in the optical path, and FIG. 7B is a schematic diagram of a projected image in a state where the glass plate is not inserted in the optical path. FIG.

  Similarly to the projector 1 of the first embodiment, the projector 1A of the second embodiment includes an integrator illumination optical system 2, a color separation optical system 3, a relay optical system 4, and an optical device 5. The image light emitted from the optical device 5 is enlarged and projected onto, for example, a screen (not shown) by the projection lens 6A. The projection lens 6A is not provided with the movable portion 62 as in the first embodiment, and has a configuration in which a plurality of optical lenses are arranged in the lens barrel.

  Further, the projector 1A is provided with an imaging change means 8 between the optical device 5 and the projection lens 6A. The imaging change means 8 includes a movable optical member 81 as an optical element constituting the imaging change means, and a motor 82 as a drive means.

  As shown in FIG. 6, the movable optical member 81 includes a pair of glass plates 811 as a pair of light flux transmitting surfaces extending in a fan shape so as to be point-symmetric with respect to the rotation center axis 8A. These glass plates 811 are formed to have a length dimension capable of shielding an optical path through which a light beam emitted from the optical device 5 passes. Moreover, these glass plates 811 are formed so that each fan center angle is substantially a right angle.

  The motor 82 is electrically connected to the control circuit unit, is driven by the control of the control circuit unit, and rotates the movable optical member 81 at a constant speed. Further, the motor 82 may be capable of switching between stationary and driving under the control of the control circuit unit.

  With the configuration as described above, when the movable optical member 81 is driven to rotate at a constant speed around the rotation center axis 8A by the motor 82, it is in the optical path between the cross dichroic prism 54 of the optical device 5 and the projection lens 6A. A glass plate 811 having a refractive index different from that of air is periodically inserted. As a result, in a state where the glass plate 811 is inserted in the optical path, the optical distance of the image light changes and the image formation state of the projected image projected from the projection lens 6A changes, as shown in FIG. A projected image that is slightly out of focus is displayed. On the other hand, in a state where the glass plate 811 is not inserted into the optical path, a projected image in a focused state is displayed.

  Here, the control circuit unit drives the motor 82 so that the projected images as shown in FIGS. 7A and 7B are alternately switched at a period of, for example, 60 Hz. For this reason, when the projection image is time-integrated, the projection image in focus and the projection image slightly out of focus are combined to produce a projection image in which the black matrix 72 is not conspicuous as shown in FIG. Can be displayed.

  Further, since the movable optical member 81 is driven to rotate by driving the motor 82, loss of mechanical energy can be suppressed as compared with reciprocating rotational vibration. Therefore, the black matrix 72 can be eliminated efficiently.

  Further, since the imaging change means 8 is provided in the optical path between the cross dichroic prism 54 and the projection lens 6A so as to change the state of the light beam that has passed through the cross dichroic prism 54, it is emitted from each liquid crystal panel 51. Since it is not necessary to change the imaging state with respect to each of the light beams, it is only necessary to change the imaging state of the color-combined light beams, so that the configuration can be simplified. The imaging change means only needs to change the state of the light beam that has passed through the cross dichroic prism 54, so that it is not limited to the optical path between the cross dichroic prism 54 and the projection lens 6A, and is emitted from the cross dichroic prism 54. The structure may be configured to act somewhere on the optical path of the light beam.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a diagram schematically showing an outline of the optical system of the projector 1B according to the third embodiment. FIG. 9 is a perspective view schematically showing an outline of the movable optical member constituting the imaging change means in the third embodiment.

  The projector 1B of the third embodiment has substantially the same configuration as that of the second embodiment, and as shown in FIG. 9, the integrator illumination optical system 2, the color separation optical system 3, the relay optical system 4, An optical device 5, a projection lens 6A, an optical housing 10, and a control circuit unit are provided. A movable optical member 83 is inserted between the cross dichroic prism 54 of the optical device 5 and the projection lens 6A.

  The projector 1B according to the third embodiment is a modification of the imaging change means 8 of the projector 1A according to the second embodiment. The imaging change means 8B in the projector 1B of the third embodiment includes a motor 82, a movable optical member 83, and a rubber roller 84 as drive means.

  The movable optical member 83 is disposed in the optical path of the image light between the optical device 5 and the projection lens 6A. The movable optical member 83 includes a substantially annular outer peripheral frame 831 and a glass plate 832 as a light flux transmitting surface provided inside the outer peripheral frame 831. The outer peripheral frame 831 is formed to have substantially the same diameter as the optical path diameter of the image light emitted from the cross dichroic prism 54, and the outer peripheral surface thereof is in contact with the rubber roller 84. The glass plate 832 is formed in a substantially semicircular shape of the outer peripheral frame 831, and the outer peripheral edge is in contact with and fixed to the inner peripheral surface of the outer peripheral frame 831. In addition, a hollow is formed in the remaining portion of the outer peripheral frame 831 where the glass plate 832 is not disposed.

The rubber roller 84 is connected to a motor 82 at a central position, and is driven to rotate by driving the motor 82. The movable optical member 83 is in contact with the outer peripheral surface of the rubber roller 84, and the movable optical member 83 is also rotationally driven by the rotation of the rubber roller 84.
In addition, although the structure which the movable optical member 83 drives with the rubber roller 84 was shown, it is not limited to this, A gearwheel is formed in the outer peripheral surface of the outer periphery frame 831 of the movable optical member 83, and the gear meshing with this gear is rotationally driven. A configuration may be adopted.

  In the configuration as described above, since the optical distance changes in a part of the light flux that has passed through the glass plate 832, the imaging state of a part of the projected image changes and the focus is slightly shifted. On the other hand, the remaining luminous flux that does not pass through the glass plate 832 does not change the optical distance, so that a projected image in focus is displayed. Then, by rotating and driving the movable optical member 83, the position of the glass plate 832 in the optical path periodically changes, and the portion in the focused state as described above and the portion in the slightly shifted focus state And periodically change. Further, the control circuit unit drives the motor 82 to rotate at a cycle of 60 Hz, for example. As a result, when the projected image is integrated over time, the projected image in focus and the projected image slightly out of focus are combined, and a projected image in which the black matrix 72 is not conspicuous as shown in FIG. Can be displayed.

  Also in this configuration, similarly to the second embodiment, since the movable optical member 83 is driven to rotate, the loss of mechanical energy can be suppressed.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a perspective view schematically showing an outline of the imaging change means in the fourth embodiment. The projector according to the fourth embodiment is a modification of the imaging change means 8 of the projector 1B of the second embodiment, and the description of the other configurations is omitted or simplified.

  As shown in FIG. 10, the imaging change means 8C in the projector according to the fourth embodiment includes a movable optical member 81A and a motor 82, and the imaging change means 8 according to the second embodiment. Similarly, the movable optical member 81 </ b> A is provided so as to be rotationally driven by driving the motor 82.

  The movable optical member 81A includes a first glass plate 811A as a light beam transmission surface that is point-symmetric with respect to the rotation center axis 8A, and a second glass plate 812A as a light beam transmission surface. These first and second glass plates 811A and 812A are each formed in a semicircular shape and connected by a diameter portion. The first glass plate 811A and the second glass plate 812A are formed of materials having different refractive indexes. Of these, for example, the first glass plate 811A is set to have a refractive index so that the image formation state of the projected image is good, that is, to be in focus, and the second glass plate 812A is in focus. The refractive index is set so that is slightly shifted.

  Also in the projector as described above, when the movable optical member 81A is driven to rotate at a constant speed around the rotation center axis 8A by the motor 82, it is in the optical path between the cross dichroic prism 54 of the optical device 5 and the projection lens 6A. The refractive indexes of the first glass plate 811A and the second glass plate 812A having different refractive indexes are inserted alternately. Thus, for example, in a state where the first glass plate 811A is inserted in the optical path, the image formation state is good, and a projected image in a focused state is projected, and the second glass plate 812A is inserted in the optical path. In this state, a projected image is projected in a state where the image formation state has deteriorated and the focus is slightly shifted. Then, when the motor 82 is driven by the control circuit unit with a period of 60 Hz, for example, and the projection image is time-integrated, the projection image in focus and the projection image slightly out of focus are synthesized, and FIG. As shown in FIG. 4, a projected image in which the black matrix 72 is not conspicuous can be displayed.

[Fifth embodiment]
Next, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a perspective view schematically showing an outline of a movable optical member constituting the imaging change means in the fifth embodiment. The projector according to the fifth embodiment is a modification of the imaging change means 8B of the projector 1B according to the third embodiment, and the description of the other configurations is omitted or simplified.

  The imaging change means 8D in the projector of the fifth embodiment includes a motor 82, a movable optical member 83A, and a rubber roller 84. The motor 82 and the rubber roller 84 are the same as the imaging change means 8B of the third embodiment, and a description thereof is omitted.

  The movable optical member 83A includes an outer peripheral frame 831 and a first glass plate 832A and a second glass plate 833A as light flux transmitting surfaces. Similar to the third embodiment, the outer peripheral frame 831 is formed to have a diameter substantially the same as the optical path diameter of the image light, and the outer peripheral surface thereof is in contact with the rubber roller 84. The first and second glass plates 832A and 833A are formed in a substantially semicircular shape of the outer peripheral frame 831. These first and second glass plates 832A and 833A are fitted to the outer peripheral frame 831 in a state in which their diameter portions are in contact with each other, and the outer peripheral edge is in contact with the inner peripheral surface of the outer peripheral frame 831 and fixed. Has been. The first glass plate 832A and the second glass plate 833A are formed of materials having different refractive indexes. Of these, for example, the first glass plate 832A is set to have a refractive index so that the image formation state of the projected image is good, that is, to be in focus, and the second glass plate 833A is in focus. The refractive index is set so that is slightly shifted.

  In the projector as described above, a part of the light beam that has passed through the first glass plate 832A is projected as a focused image, and the remainder of the light beam that has passed through the second glass plate 833A is slightly focused. Projected as a shifted projected image. Then, by rotating and driving the movable optical member 83A, the positions of the first and second glass plates 832A and 833A in the optical path are periodically changed. The part in a slightly displaced state is periodically replaced. Then, when this movable optical member 83A is driven to rotate at a period of 60 Hz, for example, and the projection image is time-integrated, the projection image in focus and the projection image slightly out of focus are synthesized, and FIG. As shown in FIG. 4, a projected image in which the black matrix 72 is not conspicuous can be displayed.

[Sixth embodiment]
Next, a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a perspective view schematically showing an outline of the imaging change means in the sixth embodiment. The projector according to the sixth embodiment is a modification of the imaging change means 8 of the projector 1A according to the second embodiment, and description of other components is omitted or simplified.

  As shown in FIG. 12, the imaging change means 8E in the projector according to the sixth embodiment includes a movable optical member 81B and a motor 82, and the imaging change means 8 according to the second embodiment. Similarly, the movable optical member 81 </ b> B is provided so as to be rotationally driven by driving the motor 82.

  The movable optical member 81B includes a pair of glass plates 811B as fan-shaped light transmission surfaces extending in a fan shape so as to be point-symmetric with respect to the rotation center axis 8A, and on the surfaces of these glass plates 811B A diffusion film 813 is attached as a diffusion surface for diffusing the image light. In addition, these glass plates 811B are formed so that the fan center angle is substantially a right angle. In addition, it is good also as a structure using not only the structure by which the diffusion film 813 was stuck on the surface of the glass plate 811B but the unevenness | corrugation which diffuses light was formed.

  In the projector as described above, when the movable optical member 81B is driven to rotate at a constant speed around the rotation center axis 8A by the motor 82, it is in the optical path between the cross dichroic prism 54 of the optical device 5 and the projection lens 6A. A glass plate 811 on which a diffusion film 813 is periodically attached is inserted. As a result, in a state where, for example, the glass plate 811B is inserted in the optical path, light is diffused by the diffusion film 813, the image formation state deteriorates, and a projected image in a slightly out-of-focus state is projected. On the other hand, in a state where the glass plate 811B is not inserted into the optical path, the image formation state is good, and a projected image in focus is projected. Then, when the motor 82 is driven by the control circuit unit at a period of 60 Hz, for example, and the projection image is time-integrated, the projection image in focus and the projection image slightly out of focus are synthesized, and FIG. As shown in FIG. 5, it is possible to display a projected image in which the black matrix 72 is not conspicuous.

[Seventh embodiment]
Next, a seventh embodiment of the present invention will be described with reference to the drawings. FIG. 13 is a perspective view schematically showing an outline of a movable optical member constituting the imaging change means in the seventh embodiment. The projector according to the seventh embodiment is a modification of the imaging change means 8B of the projector 1B according to the third embodiment, and the description of the other configurations is omitted or simplified.

  The imaging change means 8F in the projector of the seventh embodiment includes a motor 82, a movable optical member 83B, and a rubber roller 84. The motor 82 and the rubber roller 84 are the same as the imaging change means 8B of the third embodiment, and the description and illustration thereof are omitted.

  The movable optical member 83B includes an outer peripheral frame 831 and a glass plate 832B as a light flux transmitting surface. Similar to the third embodiment, the outer peripheral frame 831 is formed to have a diameter substantially the same as the optical path diameter of the image light, and the outer peripheral surface thereof is in contact with the rubber roller 84. The glass plate 832 </ b> B is formed in a substantially semicircular shape of the outer peripheral frame 831, and the outer peripheral edge is in contact with and fixed to the inner peripheral surface of the outer peripheral frame 831. A diffusion film 813 that diffuses light is attached to the surface of the glass plate 832B. In addition, it is good also as a structure etc. which the unevenness | corrugation is formed in the surface of the glass plate 832B, and diffuses not only the sticking of the diffusion film 813.

  In the above configuration, a part of the part of the light beam that has passed through the glass plate 832B is diffused by the diffusion film 813, so that the optical distance changes. As a result, the image forming state of a part of the projected image changes and the focus is slightly shifted. On the other hand, the remaining luminous flux that does not pass through the glass plate 832 does not change the optical distance, so that a projected image in focus is displayed. Then, by rotating the movable optical member 83, the position of the glass plate 832 in the optical path is periodically changed, so that the in-focus portion as described above is slightly out of focus. Can be periodically replaced. Further, when the control circuit unit time-integrates the projection image by rotating the motor 82 at a period of 60 Hz, for example, the projection image in focus and the projection image slightly out of focus are synthesized. Thus, as shown in FIG. 4, it is possible to display a projected image in which the black matrix 72 is not conspicuous.

[Eighth embodiment]
Next, an eighth embodiment of the present invention will be described with reference to the drawings. FIG. 14 is a diagram schematically showing an optical system of the projector according to the eighth embodiment. FIG. 15 is a diagram schematically showing a schematic configuration of the imaging change means in the eighth embodiment.

  14 and 15, the projector 1C according to the eighth embodiment is similar to the first to seventh embodiments in that the integrator illumination optical system 2, the color separation optical system 3, and the relay optical system 4 are used. The optical device 5 is housed in the optical housing 10 and the image light emitted from the optical device 5 is enlarged and projected onto a screen (not shown) or the like by the projection lens 6A. The projection lens 6A is not provided with the movable portion 62 as in the first embodiment, and has a configuration in which a plurality of optical lenses are arranged in the lens barrel.

  Further, in the projector 1C, a liquid crystal optical member 9 as an optical element that constitutes an imaging change means is provided between the optical device 5 and the projection lens 6A. The liquid crystal optical member 9 includes electrodes 91 on the light incident surface and the light exit surface, respectively, and liquid crystal is hermetically sealed in a sealing portion 92 sandwiched between the electrodes 91. The electrodes 91 are electrically connected to a control circuit unit that also functions as a voltage control unit. Thereby, the liquid crystal optical member 9 is controlled in the alignment state of the liquid crystal in the enclosing unit 92 according to the applied voltage applied from the control circuit unit, and changes to a refractive index corresponding to the applied voltage.

  In the projector 1C having such a configuration, the control circuit unit periodically changes the refractive index of the liquid crystal optical member 9 with a period of 60 Hz, for example. As a result, the image formation state of the projected image changes periodically, and the projected image in focus and the projected image in slightly out of focus can be switched alternately as in the above embodiment. In addition, by integrating these projection images over time, an image in which the black matrix 72 is not conspicuous can be displayed.

[Modification of the embodiment]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  For example, in the above-described embodiment, a transmission type or a reflection type configuration may be used for a screen on which image light is projected.

  Further, as the light source device used for the projectors 1, 1 </ b> A, 1 </ b> B, and 1 </ b> C, the integrator illumination optical system 2 as described above may be used. For example, an illumination optical system that emits laser light from a laser light source may be used. .

  Furthermore, in the first embodiment, the plurality of projection lenses arranged on the movable unit 62 are moved. However, only one projection lens is arranged on the movable unit 62, and only this projection lens is arranged in the main optical axis direction. It is good also as a structure to move forward / backward along.

  In the above embodiment, the imaging change means may be periodically driven to eliminate the black matrix 72, or the driving may be stopped as appropriate by user operation. In other words, in the first embodiment, the movable portion 62 may be stopped. In the second to seventh embodiments, the motor 82 is stopped to project a projected image that is always in focus. A configuration may be adopted. In the embodiment of the present invention, the period for periodically changing the imaging state of the projected image projected by periodically driving the imaging change means is not limited to the example shown in the embodiment. However, in general, it is desirable that the period of change of the imaging state is as fast as possible in consideration of suppressing flickering when human eyes perceive or performing sufficient time integration. It is preferable to change the imaging state to be a frequency. In the embodiment of the present invention, an example in which the state of the light beam that has passed through the color synthesis optical system is changed to change the image formation state of the projected image periodically is shown. The same effect can be realized even if three imaging change means are provided in each subsequent stage.

  In the second embodiment, the pair of glass plates 811 of the movable optical member 81 may be formed with different refractive indexes. Any number of glass plates may be used.

  Furthermore, in the fourth and fifth embodiments, the movable optical members 81A and 83A may be configured to include more glass plates having different refractive indexes.

  As described above, in the third, fifth, and seventh embodiments, the configuration in which the outer peripheral frame 831 and the rubber roller 84 are brought into contact with each other and the movable optical members 83, 83A, and 83B are driven to rotate is shown. However, for example, a gear may be formed on the outer peripheral surface of the outer peripheral frame 831, and a gear meshing with the gear may be rotationally driven by the motor 82.

Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. At the same time, the types of optical systems and display elements can be changed without departing from the present invention.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  The present invention can be used for a projector that projects image light onto a screen.

It is a figure which shows typically the outline of the optical system of the projector which concerns on 1st embodiment of this invention. It is a figure which shows typically operation | movement of the movable part which comprises a projection lens, (A) is a figure which shows the state which made the movable part adjoin to an optical apparatus, (B) is an optical apparatus. FIG. 6C is a diagram schematically illustrating a state in which the movable unit is further separated from the optical device. FIG. FIG. 6 is a diagram schematically illustrating an operation of a projected image in a state where a movable portion is driven, and FIG. 5A is a diagram schematically illustrating a projected image in a state where the movable portion is brought close to an optical device. ) Is a diagram schematically showing a projected image in a state where the movable portion is separated from the optical device, and (C) is a diagram schematically showing a projected image in a state where the movable portion is further separated from the optical device. It is. It is a figure which shows typically a part of projection image by which time integration was carried out. It is a figure which shows typically the optical system of the projector which concerns on 2nd embodiment. It is a perspective view which shows typically the structure of the image formation change means of 2nd embodiment. (A) is a diagram schematically showing a projected image in a state where a glass plate is inserted in the optical path, and (B) is a diagram schematically showing a projected image in a state where no glass plate is inserted in the optical path. It is. It is a figure which shows typically the outline of the optical system of the projector which concerns on 3rd embodiment. It is a perspective view which shows typically the outline of the movable optical member which comprises the image formation change means in 3rd embodiment. It is a perspective view which shows typically the outline of the image formation change means in 4th Embodiment. It is a perspective view which shows typically the outline of the movable optical member which comprises the image formation change means in 5th Embodiment. It is a perspective view which shows typically the outline of the image formation change means in 6th Embodiment. It is a perspective view which shows typically the outline of the movable optical member which comprises the image formation change means in 7th Embodiment. It is a figure which shows typically the optical system of the projector which concerns on 8th Embodiment. It is a figure which shows typically schematic structure of the image formation change means in 8th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Projector, 2 ... Integrator illumination optical system as illumination optical system, 51 ... Liquid crystal panel as fixed pixel type display element, 6 ... Projection lens as projection optical system, 8, 8B, 8C 8D, 8E, 8F... Imaging change means, 9... Liquid crystal optical member as optical element, 54. Cross dichroic prism as color synthesis optical system, 62... Movable part as imaging change means, 81, 81 A and 81 B , 83, 83A, 83B ... movable optical member as an optical element, 82 ... motor as drive means, 84 ... rubber roller as drive means, 811, 811A, 811B, 812A, 832, 832A, 832B, 833A ... luminous flux transmitting surface As a glass plate, 813 ... diffusion film as diffusion surface

Claims (10)

A projector that modulates a light beam emitted from an illumination optical system by a fixed pixel type display element and projects the light modulated light beam by a projection optical system,
A projector characterized in that it is provided with imaging change means for periodically changing the imaging state of a projected image to be projected. The projector according to claim 1, wherein
The projector is characterized in that the imaging change means periodically moves at least one of a plurality of optical lenses constituting the projection optical system in the main optical axis direction. The projector according to claim 1, wherein
The imaging change means is provided in a plane intersecting the main optical axis of the light beam, and has an optical element having a light beam transmission surface having a different refractive index, and an optical path through which the light beam passes. And a driving means for driving the projector. The projector according to claim 3, wherein
The optical element is provided so as to be rotatable about a rotating shaft provided outside the optical path, and includes the light flux transmitting surface that extends from the rotating shaft in the radial direction and can be inserted into the optical path. ,
The projector is configured to drive the optical element to rotate about the rotation axis. The projector according to claim 3, wherein
The optical element is formed to have substantially the same diameter as the light beam passing through the optical path, and is rotatable about a rotation axis provided inward of the optical path, and at least partially in the light beam. With a transmission surface,
The projector is configured to drive the optical element to rotate about the rotation axis. The projector according to claim 1, wherein
The imaging change means is provided in a plane intersecting the main optical axis of the light beam, and has an optical element having a diffusion surface for diffusing light, and is driven in the optical path through which the light beam passes. And a driving means for making the projector. The projector according to claim 6, wherein
The diffusion surface is provided so as to be rotatable about a rotation axis provided outside the optical path, and includes a diffusion surface that extends radially from the rotation axis and can be inserted into the optical path.
The projector is configured to drive the optical element to rotate about the rotation axis. The projector according to claim 6, wherein
The optical element is formed to have a diameter substantially the same as a diameter of a light beam passing through the optical path, and is provided to be rotatable about a rotation axis provided inward of the optical path, and at least partially diffuses the diffusion. With a surface,
The projector is configured to drive the optical element to rotate about the rotation axis. The projector according to claim 1, wherein
The image forming change means comprises: an optical element whose refractive index changes according to an applied voltage; and a voltage control means for periodically changing the applied voltage applied to the optical element. The projector according to any one of claims 1 to 9,
A plurality of the display elements corresponding to light beams of a plurality of colors;
A color synthesizing optical system for synthesizing the luminous flux emitted from these display elements,
The imaging change means changes the state of the light beam that has passed through the color synthesis optical system,
A projector characterized by periodically changing the imaging state of a projected image to be projected.

Images