JP5900426B2 - Optical axis adjustment device and projection device - Google Patents

Description

  The present invention relates to an optical axis adjustment device and a projection device.

  A spatial light modulation element such as a digital micromirror device (DMD), a transmissive liquid crystal display element, or a reflective liquid crystal display element is used in the projection apparatus. In order to prevent color unevenness of the projected image, an integrator element such as a light tunnel is used in the projection apparatus (see Patent Document 1), and the illuminance distribution of the light irradiated to the spatial light modulation element is made uniform by the integrator optical element. Is done. The inclination of the optical axis of the integrator optical element can be adjusted by the optical axis adjusting device so that the irradiation area of the light emitted from the integrator optical element does not deviate from the spatial light modulation element. Two adjusting screws are used in the optical axis adjusting device, the axes of these adjusting screws are orthogonal to each other, and the axes of these adjusting screws are substantially orthogonal to the optical axis of the integrator optical element. If one adjustment screw is rotated, the optical axis of the integrator optical element can be tilted up and down, and if the other adjustment screw is rotated, the optical axis of the integrator optical element can be tilted left and right.

Japanese Patent No. 5163927

  By the way, since the axes of the two adjustment screws are orthogonal, in order to rotate one adjustment screw with a screwdriver, etc., it is necessary to insert the screwdriver etc. into the groove of the head of one adjustment screw from the top of the integrator optical element. In order to rotate the other adjustment screw with a screwdriver or the like, it is necessary to insert the screwdriver or the like into the groove on the head of the other adjustment screw from the side of the integrator optical element. Therefore, it is necessary to install a space for operating one adjustment screw on the integrator optical element, and it is also necessary to install a space beside the integrator optical element.

  Therefore, the problem to be solved by the present invention is that the adjustment screw can be rotated without applying a screwdriver or the like to the head of the adjustment screw, and a large space is not provided on the end side of the adjustment screw. It is to be able to finish.

In order to solve the above-described problems, an optical axis adjusting device according to the present invention includes a case, an optical element having an optical axis accommodated in the case, an inner side of the case, and an incidence of the optical element. A support member that supports the optical element so as to be swingable in a first direction in a plane perpendicular to the direction of the optical axis, with one of the side portion and the emission side portion serving as a fulcrum; Extends in the first direction, is rotatably supported by the case, and rotates to move the other part of the incident side part and the emission side part of the optical element in the first direction. An adjustment screw for providing the adjustment screw, a wheel provided on the adjustment screw so as to be coaxial with the adjustment screw, an outer peripheral surface projecting outward from one end surface of the case in the second direction , and provided in the case The optical element from below. A first elastic member that supports the optical element, a second elastic member that elastically supports the optical element from the side, and a side opposite to the second elastic member with respect to the optical element From the one end surface side of the receiving part, and a receiving part provided in contact with the side surface of the optical element and being movable in the first direction in the case. Extending in the direction of the optical element, and disposed on the one end surface side of the optical element, and the extending portion is perpendicular to the first direction in the plane perpendicular to the direction of the optical axis. And a second adjusting screw whose tip is in contact with the upper surface of the optical element, the adjusting screw being screwed into the extending portion. The support member is located in front of the one part of the optical element as a fulcrum. Further swingably supported in the second direction of the optical element, the head of the second adjustment screw is disposed in said one end face of the extending portion.

  According to the present invention, since the adjustment screw can be rotated together with the wheel by touching the outer peripheral surface of the wheel from above the case, it is not necessary to provide a space on the end side of the adjustment screw.

1 is a perspective view of an optical axis adjustment device according to an embodiment of the present invention. It is a perspective view of the state where the cover of the optical axis adjustment device concerning the embodiment was removed. It is a perspective view of the supporting member, the 1st elastic member, and the 2nd elastic member which are used for the optical axis adjustment device concerning the embodiment. It is a perspective sectional view of the optical axis adjustment device concerning the embodiment. It is a perspective sectional view of the optical axis adjustment device concerning the embodiment. It is a longitudinal cross-sectional view of the optical axis adjustment apparatus concerning the embodiment. It is a top view of the projection apparatus provided with the optical axis adjustment apparatus which concerns on the same embodiment.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention. Therefore, the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

[First Embodiment]
FIG. 1 is a perspective view showing an optical axis adjusting apparatus 10 according to an embodiment to which the present invention is applied as viewed from above, front and right. FIG. 2 is a perspective view showing the optical axis adjustment device 10 as viewed from above, front and right, with the cover 90 removed from the optical axis adjustment device 10. FIG. 3 is a perspective view showing the support member 30, the first elastic member 41, and the second elastic member 42 used in the optical axis adjusting device 10 as viewed from above, the front, and the right. FIG. 4 is a perspective view of the optical axis adjusting device 10 as viewed from above, in front, and right, with the optical axis adjusting device 10 cut along a plane along the front, rear, left, and right. FIG. 5 is a perspective view showing the optical axis adjustment device 10 as viewed from above, front and right, with the optical axis adjustment device 10 cut along a plane along the front, rear, left and right. FIG. 6 is a cross-sectional view of the optical axis adjustment device 10 as viewed from the right side in a state where the optical axis adjustment device 10 is cut along a plane along the front, rear, upper, and lower sides.

  The optical axis adjusting device 10 includes the optical element 1. The optical axis adjusting device 10 adjusts the angle of the optical axis of the optical element 1 by swinging the exit side part of the optical element 1 with the incident side part of the optical element 1 as a fulcrum. .

  First, the optical element 1 will be described. The optical element 1 is an integrator optical element, and makes the illuminance distribution of the emitted light uniform along a plane orthogonal to the optical axis of the emitted light. More specifically, the optical element 1 is a hollow columnar light tunnel extending along the optical axis. The optical element 1 is formed with a rectangular columnar hollow, and a reflecting surface is formed on the inner surface of the rectangular columnar hollow. Is formed. The hollow of the optical element 1 is opened at the incident side end and the emission side end of the optical element 1 or is closed by a transparent member.

  The optical element 1 may be not a light tunnel but a columnar light rod extending along the optics. If the optical element 1 is a light rod, a column surface (for example, a square column surface) on the outer periphery of the optical element 1 is a total reflection surface. If the outer shape of the optical element 1 is a columnar shape having a column surface on the outer periphery, or a conical or truncated cone shape having a conical surface on the outer periphery, the optical function of the optical element 1 is the illuminance of the emitted light. The distribution is not limited to a uniform one.

  The optical element 1 may be an assembly or a single member. A single member refers to a single member that cannot be separated or disassembled. The assembly refers to an assembly of a plurality of members, and more specifically, an assembly in which an optical element body having an optical function is assembled inside a cylindrical housing (or holder). Here, the optical element 1 includes a light tunnel main body 2 and a rectangular tubular housing 3 that holds the light tunnel main body 2 inside. The outer peripheral surface of the housing 3 has a quadrangular prism shape, which becomes the outer peripheral surface of the optical element 1.

  The optical axis adjustment device 10 includes a case 20, a support member 30, a first elastic member 41, a second elastic member 42, a slider 50, a first adjustment screw 60, a wheel 70, a second adjustment screw 80, a cover 90, and the like. In the following description, the direction along the optical axis is the front-rear direction, the incident side is the rear side, and the emission side is the front side. Further, the vertical direction does not necessarily mean the direction of gravity, and the optical axis adjusting device 10 may be installed in any direction with respect to the direction of gravity.

  The support member 30 is attached to the rear part in the case 20, and the first elastic member 41 and the second elastic member 42 are attached to the case 20 in front of the support member 30. The rear portion (incident side portion) of the optical element 1 is supported by a support member 30 inside the case 20, and the optical member 1 can swing up and down and right and left with the rear portion as a fulcrum. The front part (part on the emission side) of the optical element 1 is elastically supported by the first elastic member 41 from below and is elastically supported by the second elastic member 42 from the left. A slider 50 is attached to the front portion of the case 20, and the slider 50 can move to the left and right with respect to the case 20. The front part of the optical element 1 is supported by the slider 50, and the slider 50 guides the front part of the optical element 1 up and down. The second adjustment screw 80 is screwed onto the slider 50 from above the slider 50, and the lower end of the second adjustment screw 80 is in contact with the upper surface of the optical element 1. When the second adjustment screw 80 is tightened, the front part of the optical element 1 moves downward, and when the second adjustment screw 80 is loosened, the front part of the optical element 1 moves up by the elastic force of the first elastic member 41. To do. Thereby, the optical element 1 can be shaken up and down. Further, the first adjustment screw 60 extends to the left and right at the front portion in the case 20, and the axial load and the radial load of the first adjustment screw 60 are received by the case 20 and the cover 90. The first adjustment screw 60 is a slider. A wheel 70 is provided on the first adjustment screw 60. The first adjustment screw 60 is a lead screw for moving the slider 50. That is, when the outer peripheral portion of the wheel 70 is moved in the circumferential direction and the wheel 70 and the first adjustment screw 60 are rotated, the slider 50 moves in the left-right direction, and accordingly, the optical element 1 can be shaken up and down.

First, the case 20 will be described in detail.
The case 20 includes a base plate 21, side plates 22, 23, an incident side frame 24, and stop plates 25, 26 (see FIG. 6), which are integrally formed.
The upper surface of the base plate 21 is formed in a flat shape. A guide groove 21 a is formed in the front portion of the upper surface of the base plate 21 (see FIG. 6), and the guide groove 21 a penetrates to the lower surface of the base plate 21. The guide groove 21a extends in the left-right direction. That is, the guide groove 21a extends in a direction orthogonal to the paper surface of FIG.

  Side plates 22 and 23 are provided along the left and right side edges of the base plate 21, respectively. The side plates 22 and 23 are provided in a state of being upright with respect to the base plate 21, and the side plate 22 and the side plate 23 are opposed to each other with an interval. When viewed in the front-rear direction, the side plates 22 and 23 and the base plate 21 form a U-shape (horizontal U-shape). The longitudinal length of the side plate 22 is longer than the longitudinal length of the side plate 23, the side plate 22 is provided from the rear end to the front end of the base plate 21, and the side plate 23 is behind the front end of the base plate 21 and the rear end of the base plate 21. Is provided before.

  A frame-shaped incident side frame 24 is provided at the rear end portion of the right inner surface of the side plate 22 and the rear end portion of the upper surface of the base plate 21. The incident side frame 24 is provided in a state where it is raised with respect to the right inner surface of the side plate 22 and the upper surface of the base plate 21. An incident hole 24 a (see FIG. 6) is formed in the incident side frame 24. The side plate 23 is spaced forward from the incident side frame 24.

  Stop plates 25 and 26 (see FIG. 6) are provided at the front end and the rear end of the base plate 21, respectively. The stop plate 25 is provided so as to extend forward from the front end of the base plate 21, and the stop plate 26 is provided so as to extend rearward from the rear end of the base plate 21. The stop plates 25 and 26 are formed with through holes 25a and 26a for passing fastening screws, respectively.

  The optical element 1, the support member 30, the first elastic member 41, the second elastic member 42, and the slider 50 are accommodated in the case 20.

Next, the support member 30 will be described in detail.
The support member 30 is formed into a rectangular frame-shaped thin plate, and a square-shaped opening 30 a is formed in the support member 30. The support member 30 is attached to the rear portion of the upper surface of the base plate 21 in a state of standing on the upper surface of the base plate 21, and the opening 30a and the incident hole 24a face each other. Here, a thin plate-like fixing portion 43 is connected to the lower edge of the supporting member 30, the fixing portion 43 and the supporting member 30 are bent at the connecting portion, and the fixing portion 43 is attached to the upper surface of the base plate 21 by screws 43 a. It is fixed (see FIG. 6).

  Leaf springs 31 and 32 extending to the inside of the opening 30a are provided on the edges of the two adjacent sides of the four edges of the opening 30a of the support member 30, respectively. The leaf springs 31 and 32 are bent backward at the base near the edge of the opening 30a, and the bending angle of the leaf springs 31 and 32 with respect to the support member 30 is less than 90 °.

  The support member 30 and the leaf springs 31 and 32 hold the optical element 1 so as to be swingable up and down and left and right. Specifically, the optical element 1 is held by the support member 30 and the leaf springs 31 and 32 as follows. The rear part on the incident side of the optical element 1 is inserted into the opening 30 a of the support member 30. The lower surface of the optical element 1 is in contact with the lower edge of the opening 30 a, the upper surface of the optical element 1 is in contact with the leaf spring 31, and the rear portion of the optical element 1 is sandwiched between the lower edge of the opening 30 a and the leaf spring 31. . The optical element 1 can swing up and down with the lower edge of the opening 30a as a fulcrum. The left side surface of the optical element 1 is in contact with the left edge of the opening 30 a, the right side surface of the optical element 1 is in contact with the leaf spring 32, and the rear portion of the optical element 1 is sandwiched between the left edge of the opening 30 a and the leaf spring 32. It is. The optical element 1 can swing left and right with the left edge of the opening 30a as a fulcrum.

Next, the first elastic member 41 and the second elastic member 42 will be described in detail.
The first elastic member 41 and the second elastic member 42 are leaf springs. The first elastic member 41 is attached to the upper surface of the base plate 21 while being inclined with respect to the upper surface of the base plate 21. Here, the 1st elastic member 41 is connected with the front edge of the fixing | fixed part 43, the 1st elastic member 41 and the fixing | fixed part 43 are bent in those connection parts, The fixing | fixed part 43 is a base board as mentioned above. 21 is fixed to the upper surface of 21 by screws 43a. Further, the first elastic member 41 is inclined so as to gradually move away from the upper surface of the base plate 21 from the base end toward the tip.

  The second elastic member 42 is attached to the inner surface of the side plate 22 in an inclined state with respect to the right inner surface. Here, the second elastic member 42 is connected to the front edge of the thin plate-like fixing portion 44, the second elastic member 42 and the fixing portion 44 are bent at the connecting portion, and the fixing portion 45 is connected to the side plate 22. It is fixed to the right inner surface with a screw 44a. The second elastic member 42 is inclined with respect to the right inner surface of the side plate 22 and the fixing portion 44 as it goes from the base end to the tip, and the second elastic member 42 is inclined toward the right inner surface of the side plate 22 toward the tip. Gradually leave.

  The fixing portion 44 is provided along the left side edge of the fixing portion 43, and the fixing portions 43 and 44 are bent at the connecting portions thereof, so that the fixing portion 44 is provided upright with respect to the fixing portion 43. The L-shape is formed by the fixing portions 43 and 44 when viewed in the front-rear direction. The first elastic member 41, the second elastic member 42, and the support member 30 are coupled by the fixing portions 43, 44, and the support member 30, the leaf springs 31, 32, the first elastic member 41, the second elastic member 42, and the fixing portion. 43 and 44 are integrally formed. Therefore, these are easy to attach to the case 20. The support member 30, the first elastic member 41, and the second elastic member 42 are separate members, and the support member 30, the first elastic member 41, and the second elastic member 42 are separately attached to the case 20. May be.

  The lower surface of the front part that is the emission side of the optical element 1 is in contact with the tip of the first elastic member 41. When the optical element 1 is swung down, the first elastic member 41 is elastically deformed, so that the optical element 1 is biased upward by the first elastic member 41. Further, the lower surface of the front portion of the optical element 1 can slide relative to the first elastic member 41 from side to side.

  The left side surface of the front portion of the optical element 1 contacts the tip of the second elastic member 42. The second elastic member 42 presses the front part of the optical element 1 to the right. When pushed by the second elastic member 42, the front portion of the optical element 1 is received by the slider 50.

Next, the slider 50 will be described in detail.
The slider 50 is formed in a horizontal U shape (U shape) in the front-rear direction. Here, the slider 50 has a lower extension portion 52, an upper extension portion 53, and a receiving portion 54. The lower extension portion 52 extends leftward from the lower end of the receiving portion 54, and the upper extension portion 53 receives the lower extension portion 52. The lower extension 52 and the upper extension 53 are vertically separated from the upper end of the portion 54, and the lower U 52, the upper extension 53, and the receiving portion 54 form a horizontal U character. It is formed.

  The lower extending portion 52 of the slider 50 is placed on the upper surface of the base plate 21 before the side plate 23, and the lower surface of the lower extending portion 52 can slide relative to the upper surface of the base plate 21. Here, as shown in FIG. 6, the slider 51 is provided in a convex shape on the surface of the lower extension portion 52, the slider 51 is inserted into the guide groove 21 a, and the slider 51 is inserted into the guide groove. It can slide to the left and right along 21a. As a result, the slider 50 is guided to the left and right, which is the direction perpendicular to the axis of the optical element 1, by the guide groove 21a.

  The front part of the optical element 1 on the exit side is supported by the slider 50. That is, the front part of the optical element 1 is inserted between the lower extension part 52 and the upper extension part 53, and the right side surface of the front part of the optical element 1 is between the receiving part 54 and the second elastic member 42. It is sandwiched. Further, the front portion of the optical element 1 can move up and down relatively with respect to the slider 50. That is, the right side surface of the front portion of the optical element 1 can slide up and down relatively with respect to the receiving portion 54, and the left side surface of the optical element 1 slides up and down relatively with respect to the second elastic member 42. It is possible to move.

Next, the cover 90 will be described in detail.
The cover 90 is shaped like an inverted L when viewed in the front-rear direction. Here, the cover 90 has an upper plate 91 and a side plate 92, the side plate 92 is connected to the right edge of the upper plate 91, and the side plate 92 extends downward from the right edge of the upper plate 91. The upper plate 91 lies on the upper surfaces of the side plates 22 and 23 and the incident side frame 24 of the case 20, and the upper plate 91 is fastened to the side plate 22 and the incident side frame 24 by fastening screws 93 and 94. Further, the side plate 92 is faced down to the right outer surface of the side plate 23, and the side plate 92 is fastened to the side plate 23 by a fastening screw 95. The upper extending portion 53 of the slider 50 can slide to the left and right relative to the upper plate 91, and the slider 50 can move to the left and right while being sandwiched between the upper plate 91 and the base plate 21. It has become.

  Two openings 91a and 91b are formed in the upper plate 91, and these openings 91a and 91b penetrate the upper plate 91 up and down. The opening 91 a is formed at the front portion of the upper plate 91, and the opening 91 b is formed at the right of the front portion of the upper plate 91. The opening 91a exposes a head 80a of a second adjusting screw 80 described later, and the opening 91b exposes an outer peripheral surface of a wheel 70 described later.

Next, the second adjustment screw 80 will be described in detail.
The second adjustment screw 80 is screwed into the upper extension portion 53 of the slider 50, the head portion 80a of the second adjustment screw 80 is disposed on the upper extension portion 53, and the head portion 80a of the second adjustment screw 80 is It arrange | positions in the opening 91a. Here, the female screw 53a is formed in the upper extending portion 53 so as to penetrate the upper extending portion 53 vertically (see FIG. 6), and the second adjusting screw 80 is formed on the upper extending portion 53 from the female screw 53a. The tip of the second adjustment screw 80 protrudes downward from the female screw 53a. Then, the tip of the second adjustment screw 80 contacts the upper surface of the optical element 1. The contact position of the second adjustment screw 80 is an intermediate portion between the left end and the right end of the upper surface of the optical element 1.

Next, the first adjustment screw 60 will be described in detail.
The first adjustment screw 60 is a lead screw. The first adjustment screw 60 extends in the case 20 to the left and right, which is a direction orthogonal to the axis of the optical element 1, and one end of the first adjustment screw 60 is rotatably supported by the side plate 22. The other end is rotatably supported by the side plate 92. Then, the first adjustment screw 60 is screwed into the upper extension portion 53 of the slider 50. Here, a female screw 53b is formed on the upper extension portion 53 and the receiving portion 54 of the slider 50 so as to penetrate left and right (see FIG. 5), and the first adjustment screw 60 is engaged with the female screw 53b. One end of the first adjustment screw 60 protrudes from the female screw 53b and is supported by the side plate 22, and the other end of the first adjustment screw 60 protrudes from the female screw 53b and is supported by the side plate 92.

Next, the wheel 70 will be described in detail.
The wheel 70 is provided at the right end of the first adjustment screw 60, and the wheel 70 and the first adjustment screw 60 are coaxial. The diameter of the wheel 70 is longer than the diameter of the first adjustment screw 60, and the wheel 70 extends outward in the circumferential direction from the first adjustment screw 60. The wheel 70 may have a cylindrical shape or a polygonal column shape. Alternatively, it may have a gear shape when viewed from the side.

  The wheel 70 is disposed on the right side of the slider 50. Specifically, a fan-shaped recess 50 a is formed in the upper rear portion on the right side surface of the slider 50 (particularly, the upper extension portion 53 and the receiving portion 54) and the upper front portion of the side plate 23. The part is contained in the recess 50a. The outer peripheral portion on the upper side of the wheel 70 protrudes above the upper surface of the side plate 23 and the upper surface of the slider 50. Further, the opening 91 b of the upper plate 91 overlaps the recesses 23 a and 50 a, and the outer peripheral portion on the upper side of the wheel 70 protrudes above the upper surface of the upper plate 91. On the outer peripheral surface of the wheel 70, a knurled knurled 71 attached to the side surface of the head is formed, and the knurled 71 realizes anti-slip.

  The wheel 70 may be provided at the left end portion of the first adjustment screw 60, and the wheel 70 may be disposed on the left side of the slider 50. In that case, a fan-shaped depression is formed in the upper rear portion of the left side surface of the slider 50, and a part of the wheel 70 is accommodated in the depression. Moreover, a semicircular arc-shaped depression is formed on the upper surface of the side plate 22, and a part of the wheel 70 is accommodated in the depression. Furthermore, the position where the opening 91b is formed is the left of the front portion of the upper plate 91, more specifically, the recess formed in the upper rear portion of the left side surface of the slider 50 and the upper surface of the side plate 22. It is a part which overlaps with a hollow.

  The incident side and the emission side of the optical element 1 may be opposite. That is, the exit side part (rear part) of the optical element 1 is supported by the support member 30 and the leaf springs 31 and 32, and the incident side part (front part) of the optical element 1 is a fulcrum on the exit side part of the optical element 1. It may be shaken up and down and left and right.

Next, the operation of the optical axis adjustment device 10 will be described.
When the finger is applied to the upper outer peripheral surface of the wheel 70 and the wheel 70 is rotated, the slider 50 moves left and right together with the front portion of the optical element 1. Specifically, when the slider 50 moves to the left, the front part of the optical element 1 is pushed to the left by the receiving part 54, and the front part of the optical element 1 is left against the elastic force of the second elastic member 42. Move to. On the other hand, when the slider 50 moves to the right, the front portion of the optical element 1 moves to the right by the elastic force of the second elastic member 42. Thereby, the optical element 1 can be swung to the left and right with the rear part as a fulcrum, and the left and right inclination angles of the optical axis of the optical element 1 can be adjusted.

  On the other hand, when the second adjustment screw 80 is rotated with a screwdriver or the like, the front portion of the optical element 1 moves up and down. Specifically, when the second adjustment screw 80 is tightened, the front portion of the optical element 1 moves downward against the elastic force of the first elastic member 41 by the tip of the second adjustment screw 80. On the other hand, when the second adjustment screw 80 is loosened, the front portion of the optical element 1 is moved upward by the elastic force of the first elastic member 41. Thereby, the optical element 1 can be swung up and down with the rear part as a fulcrum, and the vertical inclination angle of the optical axis of the optical element 1 can be adjusted.

According to the above embodiment, there exist the following effects.
(1) Since the wheel 70 is provided on the first adjustment screw 60, the wheel 70 and the first adjustment screw 60 can be rotated by operating the wheel 70 from above the wheel 70. That is, it is not necessary to operate one end or the other end of the first adjustment screw 60 from the right or left with a screwdriver or the like. Therefore, it is not necessary to provide a space for rotating the first adjustment screw 60 on the right side and the left side of the optical axis adjustment device 10, and other members or mechanisms can be arranged on the right side and the left side of the optical axis adjustment device 10. it can. Therefore, the apparatus using this optical axis adjustment apparatus 10 can be reduced in size.

(2) Since the head of the second adjustment screw 80 is provided on the top and the outer peripheral surface of the wheel 70 is exposed above, the second adjustment screw 80 and the wheel 70 can be removed as long as the optical axis adjustment device 10 is opened. Can be operated. The lower surface of the optical axis adjustment device 10 can be fixed to the pedestal, or another member or mechanism can be disposed immediately below the optical axis adjustment device 10.

(3) Since the depressions 23 a and 50 a are formed in the side plate 23 and the slider 50, the wheel 70 can be accommodated in the depressions 23 a and 50 a, and most of the wheel 70 can be installed inside the cover 90. Therefore, the optical axis adjusting device 10 can be reduced in size. Further, the wheel 70 does not interfere with other members or mechanisms, and the other members or mechanisms can be disposed in the immediate vicinity of the optical axis adjusting device 10.

(4) The left side surface of the front portion of the optical element 1 is in line contact or surface contact with the second elastic member 42, and the right side surface of the front portion of the optical element 1 is in line contact or surface contact with the receiving portion 54 of the slider 50. Even if the slider 50 moves left and right due to the rotation of the first adjustment screw 60, the optical element 1 does not twist.

(5) Even if the optical element 1 does not move to the left and right relative to the second adjustment screw 80 and the slider 50, the tip of the second adjustment screw 80 remains on the upper surface of the optical element 1 even if the slider 50 moves to the left and right. The position of touching does not change. The contact position is an intermediate portion between the left end and the right end of the upper surface of the optical element 1. Therefore, even if the second adjustment screw 80 moves up and down by the rotation of the second adjustment screw 80, the optical element 1 does not twist. Further, since the lower surface of the optical element 1 is in line contact or surface contact with the first elastic member 41, the twisting movement of the optical element 1 can be suppressed.

[Second Embodiment]
With reference to FIG. 7, a projection apparatus provided with the optical axis adjustment apparatus 10 is demonstrated. FIG. 7 is a plan view showing an optical unit of the projection apparatus.

  As shown in FIG. 7, the projection apparatus includes a time-division light generation device (light source device) 140, a light source side optical system 150, a projection optical system 160, and the like.

  The time-division light generator 140 emits red light, green light, and blue light in a time division manner. The time division light generator 140 includes a first light source 141, a green light generator 142, a second light source 143, and an optical system 144.

  The green light generator 142 generates green light. Specifically, the green light generator 142 emits excitation light and converts the excitation light into green light. The green light generator 142 includes a plurality of excitation light sources 142a, a plurality of collimating lenses 142b, a lens group 142c, a lens group 142d, a phosphor wheel 142e, and a spindle motor 142f.

  The plurality of excitation light sources 142a are arranged in a two-dimensional array. These excitation light sources 142a are laser diodes that emit laser excitation light. The wavelength band of the laser excitation light emitted from the excitation light source 142a is a blue band or an ultraviolet band, but is not particularly limited. The excitation light source 142a blinks at such a high speed that it cannot be identified with the naked eye.

  The collimating lens 142b is disposed opposite to the excitation light source 142a, and the laser excitation light emitted from each excitation light source 142a is collimated by the collimating lens 142b. The lens group 142c and the lens group 142d are disposed on the same optical axis. The lens group 142c and the lens group 142d combine the light flux groups of the laser excitation light collimated by the collimating lens 142b into one and collect the light.

  The phosphor wheel 142e is disposed to face a surface on which a plurality of excitation light sources 142a are arranged in a two-dimensional array. The lens group 142c and the lens group 142d are disposed between the phosphor wheel 142e and the excitation light source 142a, and the optical axes of the lens group 142c and the lens group 142d are orthogonal to the phosphor wheel 142e. The laser excitation light condensed by the lens group 142c and the lens group 142d is irradiated to the phosphor wheel 142e. The phosphor wheel 142e is made of a green phosphor that emits green light when excited by laser excitation light, and converts the laser excitation light into green light. The phosphor wheel 142e is connected to the spindle motor 142f, and the phosphor wheel 142e is rotated by the spindle motor 142f.

  The first light source 141 is a red light emitting diode that generates red light. The second light source 143 is a blue light emitting diode that generates blue light. The first light source 141 and the second light source 143 also blink at such a high speed that they cannot be identified with the naked eye. Here, the period of the first light source 141, the period of the excitation light source 142a, and the period of the second light source 143 are shifted from each other. Therefore, red light, green light (green light is generated by excitation light), and blue light are generated in a time-sharing manner. For example, the period of the first light source 141, the period of the excitation light source 142a, and the period of the second light source 143 are sequentially visited once in one frame period, and red light, green light, and blue light are emitted in one frame period. Issue one at a time. Light of at least one color among red light, green light, and blue light may be emitted a plurality of times within one frame period.

  The first light source 141 is arranged so that the optical axis of the first light source 141 is parallel to the optical axes of the lens groups 142c and 142d. The second light source 143 is arranged so that the optical axis of the second light source 143 is orthogonal to the optical axes of the lens groups 142 c and 142 d and the optical axis of the first light source 141.

  The optical system 144 superimposes the optical axis of red light emitted from the first light source 141, the optical axis of green light emitted from the green light generator 142, and the optical axis of blue light emitted from the second light source 143. These red light, green light and blue light are emitted. The optical system 144 includes a lens group 144a, a lens 144b, a lens group 144c, a first dichroic mirror 144d, and a second dichroic mirror 144e.

  The lens group 144a faces the second light source 143. The lens group 144a and the lens 144b are arranged so that their optical axes are in a straight line. The lens group 144a and the lens 144b are arranged so that their optical axes are orthogonal to the optical axes of the lens group 142c and the lens group 142d between the lens group 142c and the lens group 142d.

  The first dichroic mirror 144d is disposed between the lens group 144a and the lens 144b, and is disposed between the lens group 142c and the lens group 142d. The first dichroic mirror 144d obliquely intersects with the optical axes of the lens groups 142c and 142d at 45 °, and obliquely intersects with the optical axes of the lens groups 144a and 144b at 45 °. The first dichroic mirror 144d transmits the excitation light (for example, blue excitation light) in the wavelength band emitted from the excitation light source 142a toward the phosphor wheel 142e and the light in the blue wavelength band emitted from the second light source 143. Is transmitted toward the second dichroic mirror 144e. The first dichroic mirror 144d reflects light in the green wavelength band emitted from the phosphor wheel 142e toward the second dichroic mirror 144e.

  The lens group 144c faces the first light source 141. The lens group 144c is disposed so that its optical axis is orthogonal to the optical axes of the lens group 144a and the lens 144b on the opposite side of the second light source 143 and the first dichroic mirror 144d with respect to the lens 144b.

  The second dichroic mirror 144e is disposed on the opposite side of the first light source 141 with respect to the lens group 144c, and is disposed on the opposite side of the first dichroic mirror 144d with respect to the lens 144b. The second dichroic mirror 144e obliquely intersects with the optical axis of the lens group 144c at 45 ° and obliquely intersects with the optical axes of the lens group 144a and the lens 144b at 45 °. The second dichroic mirror 144e transmits light in the blue and green wavelength bands from the first dichroic mirror 144d toward the light source side optical system 150, and transmits light in the red wavelength band emitted from the first light source 141 to the light source side. Reflected toward the optical system 150.

The time-division light generator 140 may have a configuration other than the configuration described above as long as it emits red light, green light, and blue light in a time-sharing manner.
For example, a green light emitting diode may be arranged at a location where the optical axis of the phosphor wheel 142e and the lens group 142d intersect, and the green light emitting diode blinks at high speed. In that case, the excitation light source 142a, the lens group 142c, the phosphor wheel 142e, and the spindle motor 142f are omitted.
Further, the phosphor wheel 142e has a green phosphor and a light diffusing and transmitting portion, and even if the phosphor wheel 142e rotates, the green phosphor and the light diffusing and transmitting portion alternately pass through the optical axis of the lens group 142d. Good. In this case, the excitation light source 142a is a blue laser diode, the second light source 143 is omitted, and the blue light transmitted through the light diffusion transmission part of the phosphor wheel 142e is reflected by an optical system (not shown) of the second light source 143. In other words, the excitation light source 142a and the first light source 141 emit light alternately.
Further, the time-division light generator 140 includes a white light source and a color filter (for example, green, red, and blue color filters arranged in the circumferential direction), and light emitted from the white light source is rotating. It may be passed through a color filter.

  The light source side optical system 150 projects red light, green light, and blue light emitted from the time-division light generator 140 onto the display element 130. The light source side optical system 150 includes a lens 151, a reflection mirror 152, a lens 153, an optical element 1, an optical axis adjustment device 10, a lens 155, an optical axis conversion mirror 156, a condenser lens group 157, an irradiation mirror 158, and an irradiation lens 159. Have.

  The lens 151 is disposed on the opposite side of the lens 144b with respect to the second dichroic mirror 144e. The lens 151 is disposed so that its optical axis overlaps with the optical axes of the lens 144b and the lens group 144a.

  The lens 153, the optical element 1, and the lens 155 are arranged so that their optical axes are in a straight line. The optical axes of the lens 153, the light guide device 154, and the lens 155 are orthogonal to the optical axes of the lens 151, the lens 144b, and the lens group 144a.

  The reflection mirror 152 is disposed at a location where the optical axis of the lens 153 and the optical axis of the lens 151 intersect. The reflection mirror 152 obliquely intersects with the optical axes of the lenses 151 and 144b and the lens group 144a at 45 °, and obliquely intersects with the optical axes of the lens 153, the optical element 1, and the lens 155 at 45 °. The red light, the green light, and the blue light generated by the time division light generator 140 are reflected by the reflection mirror 152 toward the optical element 1 while being condensed by the lens 151 and the lens 153.

  The optical element 1 is a light tunnel or a light rod. The inclination of the optical axis of the optical element 1 can be adjusted by the optical axis adjusting device 10 described above. The lens 155 projects and collects red light, green light, and blue light guided by the optical element 1 toward the optical axis conversion mirror 156. The optical axis conversion mirror 156 reflects red light, green light, and blue light projected by the lens 155 toward the condenser lens group 157. The condensing lens group 157 projects red light, green light, and blue light reflected by the optical axis conversion mirror 156 toward the irradiation mirror 158 and condenses them. The irradiation mirror 158 reflects the light projected by the condenser lens group 157 toward the display element 130. The irradiation lens 159 projects the light reflected by the irradiation mirror 158 onto the display element 130.

  The display element 130 is a spatial light modulator, and forms an image by modulating red light, green light, and blue light irradiated by the light source side optical system 150 for each pixel (each spatial light modulation element). . Specifically, the display element 130 is a digital micromirror device (DMD) having a plurality of movable micromirrors and the like arranged in a two-dimensional array, and the movable micromirror serves as a spatial light modulation element as a pixel. Equivalent to. The display element 130 is driven by a driver. That is, when the display element 130 is irradiated with red light, each movable micromirror of the display element 130 is controlled (for example, PWM control), so that the red light is reflected toward the projection optical system 160 described later. The time ratio (duty ratio) is controlled for each movable micromirror. Thereby, a red image is formed by the display element 130. The same applies when the display element 130 is irradiated with green light or blue light.

  The display element 130 may be a transmissive spatial light modulator (for example, a liquid crystal shutter array panel: a so-called liquid crystal display) instead of the reflective spatial light modulator. When the display element 130 is a transmissive spatial light modulator, the optical design of the light source side optical system 150 is changed, and the optical axes of red light, green light, and blue light irradiated by the light source side optical system 150 are described later. The display element 130 is disposed between the projection optical system 160 and the light source side optical system 150 so as to overlap the optical axis of the projection optical system 160.

  The projection optical system 160 is provided so as to face the display element 130, and the optical axis of the projection optical system 160 extends back and forth to intersect the display element 130 (specifically, orthogonal). The projection optical system 160 projects the image formed by the display element 130 onto the screen by projecting the light reflected by the display element 130 forward. The projection optical system 160 includes a movable lens group 161, a fixed lens group 162, and the like. The projection optical system 160 can change the focal length by the movement of the movable lens group 161 and can perform focusing.

  Note that the optical system of the projection apparatus shown in FIG. 7 may be applied to a rear projection display apparatus.

The present invention should not be construed as being limited to the above-described embodiments and modifications, and it goes without saying that modifications and improvements can be made as appropriate without departing from the scope of the present invention. The scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and the equivalent scope thereof.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
Case and
An optical element housed in the case;
A support member that is provided inside the case and supports the optical element so that the optical element can swing left and right around one of the incident side portion and the emission side portion of the optical element;
Adjustment for extending the inside of the case to the left and right, being rotatably supported by the case, and moving the other of the incident side portion and the emission side portion of the optical element to the left and right by rotating. Screws,
A wheel provided on the adjustment screw so as to be coaxial with the adjustment screw, and an outer peripheral surface protruding above the upper surface of the case.
An optical axis adjusting device characterized by that.
<Claim 2>
The wheel has a diameter longer than the diameter of the adjusting screw,
A depression is formed on the upper surface of the side plate of the case, the wheel fits in the depression, and the outer peripheral surface of the wheel protrudes from the depression.
The optical axis adjusting device according to claim 1.
<Claim 3>
Further comprising an upper plate fixed to the upper surface of the case so as to face down,
An opening is formed in a portion of the upper plate that overlaps the depression, and the outer peripheral surface of the wheel is exposed through the opening.
The optical axis adjusting device according to claim 2.
<Claim 4>
A first elastic member provided in the case and elastically supporting the optical element from below;
A second elastic member provided in the case and elastically supporting the optical element from the side;
A contact portion that is in contact with the side surface of the optical element from the side opposite to the second elastic member with respect to the optical element, and that is movable in the right and left in the case;
An extension that is integral with the receiver, extends laterally from the top of the receiver, and is disposed on the top surface of the optical element;
A second adjusting screw that is screwed into the extension part so as to penetrate the extension part vertically and whose tip is in contact with the upper surface of the optical element;
The adjustment screw is screwed into the extension;
The support member supports the optical element so that the optical element can be further swung up and down with the one part of the optical element as a fulcrum,
The head of the second adjustment screw is disposed on the extension part,
The optical axis adjusting device according to any one of claims 1 to 3, wherein
<Claim 5>
A second depression is formed on the upper part of the side surface of the receiving part,
The wheel is in the second recess,
The optical axis adjusting device according to claim 4.
<Claim 6>
The tip of the second adjustment screw is in contact with the center in the width direction of the upper surface of the optical element;
The optical axis adjusting device according to claim 4 or 5, wherein
<Claim 7>
The optical axis adjusting device according to any one of claims 1 to 6,
A light source device that emits light;
A display element;
A projection lens facing the display element,
The optical element takes in light emitted from the light source device from the incident side and emits the light from the emission side to the display element.
A projection apparatus characterized by that.

DESCRIPTION OF SYMBOLS 1 Optical element 10 Optical axis adjustment apparatus 20 Case 23b Depression 30 Support member 41 1st elastic member 42 2nd elastic member 50 Slider 52 Lower extension part 53 Upper extension part 54 Receiving part 60 First adjustment screw 70 Wheel 80 Second Adjustment screw 80a Head 91 Upper plate 130 Display element 140 Time-division light generator (light source device)
160 Projection lens

Claims (6)

Case and
An optical element having an optical axis housed in the case;
Provided inside the case, the optical element is swung in a first direction on a plane perpendicular to the direction of the optical axis, with one of the incident side portion and the emission side portion of the optical element as a fulcrum. A support member that is movably supported;
The inside of the case extends in the first direction, is rotatably supported by the case, and rotates so that the other part of the incident side part and the emission side part of the optical element is the first part. Adjustment screw to move in the direction of
A wheel which is provided on the adjustment screw so as to be coaxial with the adjustment screw, and whose outer peripheral surface protrudes outward from one end surface of the case in the second direction;
A first elastic member provided in the case and elastically supporting the optical element from below;
A second elastic member provided in the case and elastically supporting the optical element from the side;
A receiving portion provided in contact with the side surface of the optical element from a side opposite to the second elastic member with respect to the optical element, and movable in the first direction in the case;
An extension portion that is integral with the receiving portion, extends in the first direction from the one end face side of the receiving portion, and is disposed on the one end face side of the optical element;
The extension portion is screwed into the extension portion so as to penetrate in the second direction perpendicular to the first direction in a plane perpendicular to the direction of the optical axis, and the tip thereof is the optical A second adjustment screw in contact with the top surface of the element;
With
The adjustment screw is screwed into the extension;
The support member supports the optical element so as to be further swingable in the second direction with the one part of the optical element as a fulcrum.
The head of the second adjustment screw is disposed on the one end face side of the extension part,
An optical axis adjusting device characterized by that. Before SL wheel has a longer diameter than the diameter of the adjusting screw,
A depression is formed on the one end surface of the side plate of the case, the wheel is received in the depression, and an outer peripheral surface of the wheel protrudes from the depression.
The optical axis adjusting device according to claim 1. Further comprising an upper plate fixed to the one end face so as to face the one end face of the case;
An opening is formed in a portion of the upper plate that overlaps the depression, and the outer peripheral surface of the wheel is exposed through the opening.
The optical axis adjusting device according to claim 2. A second depression is formed on the one end surface side of the side surface of the receiving portion,
The wheel is in the second recess,
The optical axis adjusting device according to any one of claims 1 to 3, wherein The tip of the second adjustment screw is in contact with the center in the width direction on the one end face side of the optical element,
The optical axis adjusting device according to any one of claims 1 to 4, wherein An optical axis adjusting device according to any one of claims 1 to 5,
A light source device that emits light;
A display element;
A projection lens facing the display element,
The optical element takes in light emitted from the light source device from the incident side and emits the light from the emission side to the display element.
A projection apparatus characterized by that.

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