JP2017227797A - Trapezoidal distortion correction mechanism, projection optical device and image projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trapezoidal distortion correction mechanism capable of preventing a size increase of an image projection device and also to provide an image projection device.SOLUTION: A trapezoidal distortion correction mechanism 70 includes: a supporting point part 74 abutting on one end in a longer direction of a folding mirror 602 such as a reflection mirror; an elastic member being energization means abutting on an end in the longer direction of the folding mirror 602; and a push-in device 72 arranged at the other end in the longer direction of the folding mirror 602 and being moving means including a push-in member 72a arranged in a movable manner in an arrow D direction and a drive unit 72b configured to move the push-in member 72a to an elastic member side.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a trapezoidal distortion correction mechanism, a projection optical apparatus, and an image projection apparatus.

  Conventionally, an image projection apparatus that projects an image formed using light emitted from a light source by a reflecting mirror and projects the image onto a projection plane, and corrects the trapezoidal distortion of the image projected on the projection plane. Correction mechanisms are known.

  Patent Document 1 describes a trapezoidal distortion correction mechanism that includes a holding member that holds an image projection apparatus main body so as to be rotatable about a vertical direction. When trapezoidal distortion has occurred in the projected image projected on the projection surface, the user rotates the image projection apparatus body about the vertical direction with respect to the holding member to adjust the posture of the image projection apparatus body Thus, the trapezoidal distortion of the projected image is corrected.

  However, in the image projection apparatus described in Patent Document 1, the trapezoidal distortion correction mechanism adjusts the attitude of the image projection apparatus main body, so that the trapezoidal distortion correction mechanism becomes large and the image projection apparatus becomes large. There was a problem.

  In order to solve the above-described problems, the present invention is provided in an image projection apparatus that projects an image formed by using light emitted from a light source onto a projection plane after being reflected by a reflection mirror, and is projected on the projection plane. In the trapezoidal distortion correction mechanism for correcting the trapezoidal distortion of the captured image, the trapezoidal distortion is corrected by adjusting the posture of the reflecting mirror.

  According to the present invention, an increase in the size of the image projection apparatus can be suppressed.

FIG. 2 is a perspective view illustrating a projector in the embodiment. The perspective view which illustrates the optical engine in an embodiment. The perspective view which illustrates a light source, an illumination optical part, an image display part, and a projection lens. The figure which illustrates the internal structure of the projection optical part in embodiment. The schematic block diagram which shows a mirror bracket, a folding mirror, and a trapezoid distortion correction mechanism. The figure explaining the holding structure of a folding mirror. The figure explaining the trapezoid distortion correction by a trapezoid distortion correction mechanism. The schematic block diagram which shows an example which rotates a folding mirror manually and correct | amends trapezoid distortion. The schematic block diagram which shows an example which correct | amends trapezoid distortion by rotating a folding mirror by making the longitudinal direction center of a folding mirror into a fulcrum. The figure explaining the holding structure of the folding mirror 602 in the structure which used the center of the longitudinal direction of the folding mirror as a fulcrum.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

[Image Projector Configuration]
FIG. 1 is a perspective view illustrating a projector 1 in the embodiment.

  The projector 1 is an example of an image projection device, has an exit window 3 and an external I / F 9, and an optical engine that generates a projection image is provided inside. For example, when input image data from a personal computer or a digital camera connected to the external I / F 9 is transmitted, the projector 1 generates a projection image based on the transmitted image data, and is shown in FIG. Thus, an image is projected from the exit window 3 onto the screen S. An operation unit 120 for user operation is provided on the upper wall surface of the projector 1 having the exit window 3. The operation unit 120 includes a power button 120a for turning on / off the power of the projector by a user operation.

In addition, a light receiving window 121 that is an opening through which an optical signal from a remote controller that is a remote control device can pass is formed on the side wall surface of the projector 1. The light receiving window 121 is provided with a remote control receiver for receiving an optical signal from the remote controller.
[Configuration of optical engine]
Next, the configuration of each part of the optical engine 15 of the projector 1 will be described.

  FIG. 2 is a perspective view illustrating the optical engine 15 in the embodiment. As shown in FIG. 2, the optical engine 15 includes a light source 30, an illumination optical unit 40, an image display unit 50, and a projection optical unit 60, and is provided inside the projector 1.

  The light source 30 is provided on the side surface of the illumination optical unit 40 and irradiates light in the X2 direction. The light source 30 is held by a light source holder 31 and a light source bracket 32. The illumination optical unit 40 guides the light emitted from the light source 30 to the image display unit 50 provided below. The image display unit 50 generates a projection image using the light guided by the illumination optical unit 40. The projection optical unit 60 is provided above the illumination optical unit 40 and projects the projection image generated by the image display unit 50 to the outside of the projector 1.

  The optical engine 15 according to the present embodiment is configured to project an image upward using the light emitted from the light source 30, but may be configured to project an image in the horizontal direction. Good.

[Illumination optics]
FIG. 3 is a perspective view illustrating the light source 30, the illumination optical unit 40, the image display unit 50, and the projection lens 601.

  As shown in FIG. 3, the illumination optical unit 40 includes a color wheel 401, a light tunnel 402, relay lenses 403 and 404, a cylinder mirror 405, and a curved mirror 406.

  The color wheel 401 is a disk in which, for example, cyan, white, red, yellow, green, and blue color filters are provided in different circumferential directions. The color wheel 401 rotates at high speed to time-divide the light emitted from the light source 30 into each color.

  The light tunnel 402 is formed in a square cylinder shape by bonding, for example, plate glass or the like. The light tunnel 402 causes the light of each color transmitted through the color wheel 401 to be multiple-reflected on the inner surface, thereby uniformizing the luminance distribution and guiding it to the relay lenses 403 and 404.

  The relay lenses 403 and 404 collect light while correcting the axial chromatic aberration of the light emitted from the light tunnel 402.

  The cylinder mirror 405 and the curved mirror 406 reflect the light emitted from the relay lenses 403 and 404 to the light modulation element 502 provided in the image display unit 50. The light modulation element 502 modulates the reflected light from the curved mirror 406 to generate a projected image.

  The light tunnel 402, the relay lenses 403 and 404, the cylinder mirror 405, and the curved mirror 406 are held by the illumination bracket 407. Further, the projection bracket 601 is attached to the illumination bracket 407 via the image display unit 50 and the lens holder 604.

[Projection optics]
FIG. 4 is a diagram illustrating the internal configuration of the projection optical unit 60 in the embodiment. The projection optical unit 60 includes a projection lens 601, a folding mirror 602 that is a plane mirror, a curved mirror 603, and a transmission glass 605.

  The projection lens 601 has a plurality of lenses, and forms a projection image generated by the light modulation element 502 of the image display unit 50 on the folding mirror 602. The folding mirror 602 and the curved mirror 603 reflect the formed projection image so as to be enlarged, pass through the transmission glass 605 and project it onto the screen S or the like outside the projector 1.

  As shown in FIG. 2, the folding mirror 602 and the transmission glass 605 are held by the mirror bracket 62. The curved mirror 603 is held by the free mirror bracket 61. As will be described later, the folding mirror 602 is held by the mirror bracket 62 so as to be rotatable about the Z-axis direction. The transmission glass 605 is positioned and fixed to the mirror bracket 62 by pressing both ends in the X direction against the mirror bracket 62 by a plate spring-like glass pressing member 63.

  The curved mirror 603 has its upper end substantially centered against the free mirror bracket 61 by a leaf spring-like free mirror pressing member 64, and both lower ends in the X direction are fixed to the free mirror bracket 61 with screws. The free mirror bracket 61 is attached to the mirror bracket 62.

  Since the projector 1 is usually installed on a desk or the like by a user, the projector 1 main body may be installed inclined with respect to the screen S in some cases. In this case, horizontal trapezoidal distortion occurs in the projected image projected on the screen S. Further, the above-mentioned horizontal trapezoidal distortion may occur due to manufacturing errors or assembly errors of members constituting the optical engine. When correcting the horizontal trapezoidal distortion of the projected image by the keystone correction, there is a problem that the projected image quality deteriorates because the projected image becomes partially rough. Therefore, in this embodiment, a trapezoidal distortion correction mechanism that corrects horizontal trapezoidal distortion by rotating one end of the folding mirror 602 in the X direction so as to be displaced in a direction perpendicular to the reflecting surface of the folding mirror 602 is provided. ing. Hereinafter, it demonstrates concretely using drawing.

FIG. 5 is a schematic configuration diagram showing the mirror bracket 62, the folding mirror 602, and the trapezoidal distortion correction mechanism 70. FIG. 6 is a diagram for explaining a holding structure of the folding mirror 602.
The trapezoidal distortion correction mechanism 70 includes a fulcrum part 74, an elastic member 73 as urging means, and a pushing device 72 as moving means.
The fulcrum part 74 is provided at one end in the X direction (longitudinal direction of the folding mirror 602) of the folding mirror mounting surface 62a to which the folding mirror 602 of the mirror bracket 62 is mounted, and at both ends in the short direction of the folding mirror. The fulcrum part 74 has a semi-cylindrical shape, and one end in the longitudinal direction of the reflection surface of the folding mirror 602 is in contact with the vertex of the fulcrum part 74.

  An elastic member 73 made of rubber or the like is attached to the other end in the longitudinal direction of the folding mirror attaching surface 62a and at the center in the short side direction. The elastic member 73 is a rectangular parallelepiped long in the short direction. In this embodiment, an elastic member is used, but a plate spring or a coil spring may be used. The other longitudinal end of the reflecting surface 602 a of the folding mirror 602 is in contact with the elastic member 73.

  As shown in FIG. 5, a leaf spring 71 is provided so as to face the fulcrum part 74 via the folding mirror 602 and presses the back surface of the folding mirror 602 to press it against the fulcrum part 74. The leaf spring 71 is screwed to the mirror bracket 62.

  The pushing device 72 is provided at the other end in the longitudinal direction of the folding mirror 602, and is provided with a pushing member 72a that can be moved in the direction of arrow D in the drawing, and a driving device 72b that moves the pushing member 72a in the direction of arrow D in the drawing. It has. The pushing member 72 a presses the central portion of the other end in the longitudinal direction of the back surface of the folding mirror 602 to press the folding mirror 602 against the elastic member 73. A controller 80 is connected to the pushing device 72. A remote control receiving unit 81 is connected to the control unit 80.

  The folding mirror 602 is attached to the folding mirror mounting surface 62a by being pressed toward the folding mirror mounting surface 62a by the leaf spring 71 and the pushing member 72a.

FIG. 7 is a diagram for explaining trapezoidal distortion correction by the trapezoidal distortion correction mechanism 70.
As shown in FIG. 7A, when a horizontal trapezoidal distortion occurs in the projected image P projected on the screen S, the user operates the remote controller 83 to correct the horizontal trapezoidal distortion. Then, the operation signal transmitted from the remote controller 83 is received by the remote controller receiver 81 through the light receiving window 121. The remote control receiving unit 81 transmits the received operation signal to the control unit 80. The control unit 80 controls driving of the driving device 72b of the pushing device 72 based on the operation signal.

When the pushing member 72a is moved downward (in the elastic member side) in FIG. 5 by the driving device 72b, the other longitudinal end of the folding mirror 602 resists the restoring force of the elastic member 73 in FIG. Displaces downward in the figure. Then, the folding mirror is rotated counterclockwise in FIG. 5 with the fulcrum part 74 as a fulcrum, and the attitude (tilt) of the folding mirror is changed.
Contrary to the above, when the pushing member 72a is moved upward (in the direction away from the elastic member) in FIG. 5 by the driving device 72b, the other end in the longitudinal direction of the folding mirror 602 is shown by the restoring force of the elastic member 73. 5 is displaced upward in the figure. Then, the folding mirror 602 rotates clockwise with the fulcrum part 74 as a fulcrum, and the attitude (tilt) of the folding mirror is changed.

  When the other end side of the projection image corresponding to the other end side of the folding mirror displaced in the direction perpendicular to the reflecting surface 602a by the pushing device 72 is shorter than the one end side, the pushing member 72a is moved to the upper side in FIG. (In a direction away from the elastic member). Thereby, the other end side of the projected image is enlarged, and the horizontal trapezoidal distortion is corrected. On the other hand, when the other end side of the projected image is longer than the one end side, the pushing member 72a is moved to the lower side (elastic member side) in FIG. Thereby, the other end side of the projected image is enlarged, and the horizontal trapezoidal distortion is corrected.

  As described above, the trapezoidal distortion correction mechanism 70 of the present embodiment corrects the trapezoidal distortion of the projected image by adjusting the posture of the folding mirror 602 in the apparatus main body. Therefore, the trapezoidal distortion mechanism can be reduced in size compared with the trapezoidal distortion correction mechanism that corrects the trapezoidal distortion by adjusting the attitude of the entire apparatus main body, and the projector can be prevented from being enlarged. In addition, by providing the trapezoidal distortion correction mechanism 70, the trapezoidal distortion generated due to an assembly error or a manufacturing error can be corrected by the trapezoidal distortion correction mechanism.

  In the present embodiment, the folding mirror 602 is attached to the mirror bracket 62 by holding one end of the folding mirror 602 between the fulcrum part and the leaf spring and holding the other end by the elastic member and the pushing device 72. It is attached. As a result, when correcting the trapezoidal distortion by adjusting the attitude of the folding mirror 602, the fixing of the folding mirror 602 to the mirror bracket 62 is released, or after the keystone distortion correction, the folding mirror 602 is moved to the mirror bracket 62. The trapezoidal distortion can be corrected without performing the fixing operation.

  Further, unlike keystone correction, it is possible to correct horizontal trapezoidal distortion of a projected image without thinning out pixels or the like, so that quality deterioration of the projected image can be suppressed. Further, by adjusting the attitude of the folding mirror 602, which is a plane mirror, and correcting the trapezoidal distortion, the projected image projected on the screen S is compared with the case of correcting the trapezoidal distortion by adjusting the attitude of the curved mirror 603. Defocusing of P can be suppressed.

  Further, the driving force may be transmitted from the driving device 72b to the pushing member 72a via a speed reduction mechanism such as a worm gear. As a result, the amount of movement of the push-in member 72a with respect to the drive amount of the drive device 72b is reduced, so that fine adjustment is possible and it is possible to correct trapezoidal distortion with high accuracy.

  In this embodiment, the driving device 72b is provided and the folding mirror 602 is automatically rotated to correct the trapezoidal distortion. However, the folding mirror 602 is manually rotated to correct the trapezoidal distortion. Also good.

FIG. 8 is a schematic configuration diagram illustrating an example in which the folding mirror 602 is manually rotated to correct the trapezoidal distortion.
As shown in FIG. 8, the pushing device 90 as a moving means includes an adjusting screw 93. One end of the adjustment screw 93 is screwed into a screw hole formed in a sheet metal holder 92 attached to the mirror bracket 62, and the tip of the adjustment screw 93 is in contact with the back surface of the folding mirror 602. A pinion gear 91 is attached to the head of the adjustment screw 93, and a rack gear 94 is engaged with the pinion gear 91. One end of an adjustment lever 95 is rotatably attached to the right end portion of the rack gear 94 in the drawing, and the adjustment lever 95 is rotatably supported by a support shaft 95a. The adjustment lever 95 passes through the upper wall surface 1 a of the projector 1, and the other end is exposed to the outside of the projector 1.

  When the user moves the other end of the adjustment lever 95 in the direction of the arrow in the figure, the adjustment lever 95 rotates about the support shaft 95a. When the adjustment lever 95 is rotated, the rack gear 94 is moved, the pinion gear 91 is rotated, and the adjustment screw 93 is rotated. When the adjustment screw 93 rotates, the adjustment screw 93 moves in a direction perpendicular to the paper surface (a direction perpendicular to the reflection surface of the folding mirror 602), and the other end of the folding mirror 602 is perpendicular to the reflection surface. Displace in the direction. As a result, the folding mirror 602 rotates around one end as a fulcrum in the same manner as described above, and the folding mirror 602 tilts. Thereby, the trapezoidal distortion of the projected image projected on the screen S is corrected.

  In the above description, the trapezoidal distortion is corrected by rotating the folding mirror 602 with the one end in the longitudinal direction of the folding mirror 602 as a fulcrum. Trapezoidal distortion may be corrected.

  FIG. 9 is a schematic configuration diagram showing an example of correcting trapezoidal distortion by rotating the folding mirror 602 with the center in the longitudinal direction of the folding mirror 602 as a fulcrum. FIG. 10 is a diagram illustrating a holding structure of the folding mirror 602 in a configuration in which the center in the longitudinal direction of the folding mirror 602 is a fulcrum.

  As shown in FIGS. 9 and 10, the fulcrum portions 74 are provided at both ends in the short direction of the folding mirror at the center of the folding mirror 602 in the longitudinal direction of the folding mirror 602. Further, the leaf spring 71 that presses the folding mirror 602 against the fulcrum part 74 abuts against the end in the short direction at the center of the back surface of the folding mirror 602 to urge the folding mirror 602 toward the fulcrum part 74. ing. In the configuration shown in FIGS. 9 and 10, the center in the longitudinal direction of the folding mirror 602 is sandwiched between the pair of fulcrum portions 74 and the leaf spring 71, and the other end in the longitudinal direction is the elastic member 73 and the pushing device 72. Thus, the push-back mirror 602 is attached to the mirror bracket 62.

  In the configuration shown in FIGS. 9 and 10, when the pushing member 72a is moved in the direction of arrow D (direction perpendicular to the reflecting surface of the folding mirror) by the driving device 72b, the folding mirror 602 is moved in the longitudinal direction. It turns around the center. As a result, the posture (tilt) of the folding mirror 602 is changed, and the horizontal trapezoidal distortion of the projected image projected on the screen S is corrected.

  In the case of the center fulcrum, when the push-in member 72a is moved in the upper side of FIG. 9 (in the direction away from the elastic member), the other end side of the projected image corresponding to the other end side of the folding mirror is enlarged and the one end side is reduced. Is done. On the other hand, when the pushing member 72a is moved to the lower side (elastic member side) in FIG. 9, the other end side of the projection image is reduced and the one end side is enlarged. Therefore, when the other end side of the projected image is shorter than the one end side, the trapezoidal distortion is corrected by moving the push-in member 72a in the upper side (the direction away from the elastic member) in FIG. On the other hand, when the other end side of the projected image is longer than the one end side, the trapezoidal distortion is corrected by moving the pushing member 72a to the lower side (elastic member side) in FIG.

The maximum amount of displacement in the vertical direction of the reflecting surface on the other end with which the pushing member 72a of the folding mirror 602 contacts is the gap between the reflecting surface 602a and the folding mirror mounting surface 62a, the stroke amount of the pushing member 72a, the elastic member It is determined in advance by the device configuration such as the amount of compressible deformation. When the center fulcrum is used, the rotation angle of the folding mirror when the other end of the folding mirror 602 is displaced at the maximum can be doubled as compared with the one-end fulcrum. Therefore, when the center fulcrum is used as shown in FIGS. 9 and 10, there is an advantage that the range in which distortion can be corrected can be widened.
On the other hand, when the end fulcrum shown in FIGS. 5 and 6 is used, there is a merit that fine adjustment is possible because the amount of rotation of the folding mirror with respect to the amount of displacement in the direction perpendicular to the reflecting surface on the other end side is small. is there. Therefore, the end fulcrum shown in FIGS. 5 and 6 or the central fulcrum shown in FIGS. 9 and 10 may be determined as appropriate based on the function and configuration required by the projector.

What was demonstrated above is an example, and there exists an effect peculiar for every following aspect.
(Aspect 1)
An image projection apparatus such as a projector that projects an image formed using light emitted from the light source 30 onto a projection surface such as a screen S after being reflected by a reflection mirror such as a folding mirror 602 is projected onto the projection surface. In the trapezoidal distortion correction mechanism 70 for correcting the trapezoidal distortion of the image that has been corrected, the posture of the reflecting mirror is adjusted to correct the trapezoidal distortion.
According to this, since the trapezoidal distortion is corrected by adjusting the posture of the reflecting mirror that is one member in the image projection apparatus main body, the image projection apparatus main body is rotated about the vertical direction with respect to the holding member. As compared with the case where the keystone distortion is corrected by adjusting the posture of the image projection apparatus main body, the trapezoid distortion correction mechanism can be reduced in size, and the increase in size of the image projection apparatus can be suppressed.

(Aspect 2)
In the aspect 1, the image projection projection apparatus having a plane mirror such as the folding mirror 602 and the curved mirror 603 as the reflection mirror is provided, and the attitude of the plane mirror is adjusted to correct the trapezoidal distortion. .
According to this, as described in the embodiment, the focus deviation of the image projected on the projection surface such as the screen S can be suppressed as compared with the case where the posture of the curved mirror 603 is adjusted to correct the trapezoidal distortion. Can do.

(Aspect 3)
In the first or second aspect, one end of a reflecting mirror such as the folding mirror 602 is displaced in a direction perpendicular to the image reflecting surface of the reflecting mirror, and is rotated in the direction perpendicular to the image reflecting surface to thereby reflect the reflecting mirror. Adjust the posture.
According to this, as explained in the embodiment, the trapezoidal distortion can be corrected.

(Aspect 4)
In the aspect 3, the other end of the reflection mirror such as the folding mirror 602 is supported as a fulcrum, and the reflection mirror is rotated in a direction perpendicular to the image reflection surface.
According to this, as described in the embodiment, the amount of rotation of the reflection mirror relative to the amount of displacement of one end of the reflection mirror can be reduced as compared with the case where the reflection mirror is rotated about the center of the reflection mirror. Thereby, compared with the case where the reflection mirror is rotated with the center of the reflection mirror as a fulcrum, fine adjustment is possible, and trapezoidal distortion correction can be performed with high accuracy.

(Aspect 5)
In the aspect 3, the reflection mirror is rotated in the vertical direction with respect to the image reflection surface with the center of the reflection mirror such as the folding mirror 602 as a fulcrum.
According to this, as explained in the embodiment, the rotation amount of the reflection mirror when the reflection mirror one end is displaced at the maximum is compared with the case where the reflection mirror is rotated with the end portion of the reflection mirror as a fulcrum. Can do a lot. Thereby, the range which can correct | amend a trapezoid distortion can be expanded compared with the case where a reflection mirror is rotated by using the edge part of a reflection mirror as a fulcrum.

(Aspect 6)
In any one of the aspects 3 to 5, the biasing means such as the elastic member 73 that biases one end of the reflection mirror such as the folding mirror 602 to the one side in the vertical direction, and the biasing force of the biasing means on one end of the reflection mirror And a moving means such as a pushing device 72 that moves the other side in the vertical direction against the above.
According to this, as described in the embodiment, one end of a reflection mirror such as the folding mirror 602 can be displaced in a direction perpendicular to the image reflection surface of the reflection mirror.

(Aspect 7)
In the aspect 6, the moving means such as the pushing device 72 includes a pushing member 72a that pushes one end of the reflecting mirror such as the folding mirror 602 to the other side in the vertical direction, and driving means such as a driving device 72b that drives the pushing member 72a. Equipped with.
According to this, as described in the embodiment, the reflecting mirror such as the folding mirror is automatically rotated by controlling the driving means such as the driving device 72b by the operation of the remote controller or the like, thereby correcting the trapezoidal distortion. be able to.

(Aspect 8)
A projection optical unit 60 that includes a reflection mirror such as a folding mirror 602, reflects an image formed by an image forming unit such as the image display unit 50, and projects the image onto a projection surface such as a screen S. The projection optical apparatus includes the trapezoidal distortion correction mechanism according to any one of aspects 1 to 7.
According to this, the trapezoidal distortion of the image projected on the projection surface such as the screen S can be corrected.

(Aspect 9)
A projector including a light source 30, an image forming unit such as an image display unit 50 that forms an image using light from the light source 30, and a projection optical unit 60 that projects the image onto a projection surface such as a screen S. In the image projection apparatus 1 or the like, the projection optical apparatus described in the aspect 8 is used as the projection optical unit 60.
According to this, the trapezoidal distortion of the image projected on the projection surface such as the screen S can be corrected.

1: projector 1a: upper wall surface 3: exit window 15: optical engine 30: light source 40: illumination optical unit 50: image display unit 60: projection optical unit 61: free mirror bracket 62: mirror bracket 62a: folding mirror mounting surface 70: Trapezoidal distortion correction mechanism 71: leaf spring 72: push-in device 72a: push-in member 72b: drive device 73: elastic member 74: fulcrum part 80: control unit 81: remote control receiving unit 83: remote control 90: push-in device 91: pinion gear 92: holder 93: adjustment screw 94: rack gear 95: adjustment lever 95a: support shaft 120: operation unit 120a: power button 121: light receiving window 601: projection lens 602: folding mirror 602a: reflecting surface 603: curved mirror 604: lens holder 605: transmission Glass P: Projected image S: Screen

Japanese Patent No. 5704443

Claims (9)

A trapezoidal distortion correction mechanism for correcting a trapezoidal distortion of an image projected on the projection plane, provided in an image projection apparatus that projects an image formed using light emitted from a light source onto a projection plane after being reflected by a reflection mirror In
A trapezoidal distortion correction mechanism for correcting trapezoidal distortion by adjusting the posture of the reflecting mirror. The trapezoidal distortion correction mechanism according to claim 1,
As the reflection mirror, provided in an image projection projection apparatus having a plane mirror and a curved mirror,
A trapezoidal distortion correction mechanism for correcting trapezoidal distortion by adjusting the attitude of the flat mirror. The trapezoidal distortion correction mechanism according to claim 1 or 2,
A trapezoid in which one end of the reflecting mirror is displaced in a direction perpendicular to the image reflecting surface of the reflecting mirror and rotated in a direction perpendicular to the image reflecting surface to adjust the posture of the reflecting mirror. Distortion correction mechanism. In the trapezoidal distortion correction mechanism according to claim 3,
A trapezoidal distortion correction mechanism, wherein the other end of the reflection mirror is supported as a fulcrum, and the reflection mirror is rotated in a direction perpendicular to the image reflection surface. In the trapezoidal distortion correction mechanism according to claim 3,
A trapezoidal distortion correcting mechanism characterized in that the reflecting mirror is rotated in a direction perpendicular to the image reflecting surface with the center of the reflecting mirror as a fulcrum. In the trapezoidal distortion correction mechanism according to any one of claims 3 to 5,
Urging means for urging one end of the reflecting mirror toward the one side in the vertical direction;
A trapezoidal distortion correction mechanism comprising: a moving means for moving one end of the reflecting mirror to the other side in the vertical direction against the urging force of the urging means. The trapezoidal distortion correction mechanism according to claim 6,
The trapezoidal distortion correction mechanism, wherein the moving means includes a pushing member that pushes one end of the reflecting mirror into the other side in the vertical direction, and a driving means that drives the pushing member. In a projection optical apparatus that includes a reflection mirror and reflects an image formed by the image forming unit by the reflection mirror and projects the image onto a projection surface.
A projection optical apparatus comprising the trapezoidal distortion correction mechanism according to claim 1. A light source;
An image forming unit that forms an image using light from the light source;
In an image projection apparatus comprising a projection optical unit that projects the image onto a projection surface,
An image projection apparatus using the projection optical apparatus according to claim 8 as the projection optical unit.

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