JP2012173342A - Angle adjustment mechanism for optical element, and projection type image display device - Google Patents

Abstract

An optical element angle adjustment mechanism capable of adjusting the direction of a light emitting surface of an optical element in two directions orthogonal to each other, and a projection image display apparatus capable of projecting a high-luminance and high-quality image.
An angle adjustment mechanism for an optical element includes a rod holder, a housing for rotatably supporting the rod holder, a first force application member (plate spring arm), and a second force application member. (The leaf spring arm 18), the coil springs (4a, 4b) for applying a force toward the positioning portion to the rod holder 2, and a force against the first direction component of the first force to give the rod holder 2 The first adjusting screw 9a that adjusts the position of the light emitting surface of the rod holder 2 with respect to the housing in the first direction and the force that resists the second direction component of the second force And a second adjusting screw 9b for rotating the rod holder 2 around the positioning portion as a fulcrum and adjusting the position of the light emitting surface of the rod holder 2 relative to the housing in the second direction.
[Selection] Figure 3

Description

  The present invention relates to an angle adjustment mechanism for an optical element capable of adjusting the angle of the optical axis of a held optical element in two directions orthogonal to each other, and a projection type image display apparatus including the angle adjustment mechanism. .

  Projection-type image display devices such as projectors and projection televisions that project an image on a screen using a light modulation element such as a DMD (Digital Micro-mirror Device) in order to efficiently use light rays generated by a light source It is necessary to illuminate the light modulation element with an illumination beam having a shape close to the shape of the light receiving surface (the shape of the irradiation region). For this purpose, for example, a light intensity uniformizing element such as a prismatic rod integrator made of glass or transparent plastic or a light tunnel (light pipe) with a hollow structure having an inner surface as a mirror surface is used. (Irradiation area shape) is converted into a quadrangle that is close to the shape of the light receiving surface of the light modulation element. In order to obtain a bright projection light beam without wasting the illumination light beam, it is desirable to illuminate substantially the same range as the light receiving surface of the light modulation element. However, if the illumination area is approximately the same size as the light receiving surface, the entire light receiving surface cannot be illuminated even if the position of the illumination light beam is slightly shifted, and the projected image edge may be lost. For this reason, high processing accuracy is required for the components to be configured, and high assembly accuracy is required for assembling the components, so that the workability of the components and the assembly of the components are reduced, and the component costs and the assembly costs are increased. There was a problem.

  As a solution to such a problem, there is a proposal to prevent the light receiving surface of the light modulation element from protruding from the irradiation region by the light beam by rotating the irradiation region by the light beam that has passed through the light tunnel (for example, Patent Documents). 1).

JP 2007-248752 (paragraph 0014, FIG. 4, FIG. 8, FIG. 13, FIG. 14)

  However, the light tunnel angle adjustment mechanism proposed in Patent Document 1 only rotates the light irradiation region, and cannot move the light irradiation region in the vertical and horizontal directions. Therefore, in this prior art, when the light irradiation area is deviated in the vertical direction or the horizontal direction with respect to the light receiving surface of the light modulation element, it cannot be corrected, and the edge of the projected image is cut off or displayed darkly. There were problems such as being.

  Therefore, the present invention has been made to solve the above-described conventional technique, and the purpose thereof is to adjust the angle of the optical element that can adjust the direction of the light emitting surface of the optical element in two directions orthogonal to each other. It is an object of the present invention to provide a mechanism and a projection-type image display device capable of projecting a high-luminance and high-quality image.

  The optical element angle adjustment mechanism according to the present invention includes a light incident surface, a light exit surface, and a holding member that holds an optical element having a plurality of side surfaces connecting the light entrance surface and the light exit surface; A housing that includes a positioning portion with which the light incident surface side portion of the holding member abuts, and that supports the holding member in a rotatable manner with the positioning portion as a fulcrum; and the holding member orthogonal to the optical axis of the optical element A first force applying member for applying a first force having a first direction component, and a second member having a second direction component orthogonal to both the optical axis and the first direction on the holding member. A second force applying member for applying a force of 3, a third force applying member for applying a third force having a component in the optical axis direction toward the positioning portion to the holding member, and the holding member , A fourth component having a component in the optical axis direction toward the positioning portion A fourth force-applying member that imparts a force, and a force that resists a component in the first direction of the first force to rotate the holding member with the positioning portion as a fulcrum, thereby holding the housing with respect to the housing A first adjusting member that adjusts a position of the light emitting surface of the member in the first direction; and a force that resists a component of the second force in the second direction to apply the holding member to the positioning unit. And a second adjusting member for adjusting the position of the light emitting surface of the holding member with respect to the housing in the second direction.

  The projection-type image display device according to the present invention includes a light source that generates light, a light modulation element that forms an image based on an input signal, an illumination optical system that irradiates the light modulation element with the light, and the light modulation element A projection optical system for enlarging and projecting the light beam modulated by the light onto the screen, and the illumination optical system adjusts the angle of the light intensity equalizing element, which is an optical element that transmits light from the light source, and the angle of the optical element And an angle adjusting mechanism for the optical element.

  According to the angle adjustment mechanism of the optical element according to the present invention, the direction of the light emitting surface of the optical element can be adjusted in two directions orthogonal to each other, so that the positions of the areas illuminated through the optical element are orthogonal to each other. Can be adjusted in two directions.

  According to the projection type image display apparatus of the present invention, the light receiving surface is adjusted without adjusting the illumination area from the light receiving surface of the light modulation element by adjusting the angle of the light intensity uniformizing element in the vertical direction and the horizontal direction. Since the whole can be illuminated, the edges of the projected image are not lost.

It is an external appearance perspective view (when seen from the diagonally upper side on the light incident surface side) showing the angle adjustment mechanism of the light intensity equalizing element according to the first embodiment. It is an external appearance perspective view (when it sees from the diagonally upper side of the light-projection surface side) which shows the angle adjustment mechanism of the light intensity equalization element based on Embodiment 1. FIG. FIG. 3 is an external perspective view (when viewed from obliquely above the light emitting surface side) showing a portion excluding the housing of the angle adjusting mechanism of the light intensity equalizing element shown in FIG. 2. FIG. 4 is an exploded perspective view of the configuration shown in FIG. 3. FIG. 5 is an exploded perspective view showing the rod integrator and the rod holder shown in FIG. 4 upside down. It is an expansion perspective view which expands and shows the leaf | plate spring shown by FIG. (A) And (b) is the side view and front view which show the front-end | tip vicinity of the 3rd and 4th arm. (A) And (b) is the side view and front view which show the front-end | tip vicinity of the 1st and 2nd arm. It is an external appearance perspective view which shows the housing of the angle adjustment mechanism of the light intensity equalization element shown by FIG. (A) And (b) is a schematic sectional drawing (figure equivalent to the section which cuts Drawing 3 with a XX line) showing operation of the angle adjustment mechanism of the light intensity equalization element concerning Embodiment 1. FIG. (A) And (b) is a schematic sectional drawing (figure equivalent to a section which cuts Drawing 3 with a XI-XI line) showing operation of an angle adjustment mechanism of a light intensity equalization element concerning Embodiment 1. (A)-(c) It is explanatory drawing of the adjustment method of the illumination area | region of the angle adjustment mechanism of the light intensity equalization element based on Embodiment 1. FIG. It is an external appearance perspective view (when it sees from the diagonal upside on the light-incidence surface side) which shows the angle adjustment mechanism of the light intensity equalization element based on Embodiment 2. FIG. It is a disassembled perspective view which shows the part except the housing of the angle adjustment mechanism of the light intensity equalization element shown by FIG. It is an external appearance perspective view (when it sees from the diagonal upside on the light-incidence surface side) which shows the angle adjustment mechanism of the light intensity equalization element based on Embodiment 3. It is a side view which shows the angle adjustment mechanism of the light intensity equalization element shown by FIG. It is a top view which shows the angle adjustment mechanism of the light intensity equalization element shown by FIG. It is a disassembled perspective view which shows the part except the housing of the angle adjustment mechanism of the light intensity equalization element shown by FIG. (A) And (b) is a schematic sectional drawing which shows operation | movement of the angle adjustment mechanism of the light intensity equalization element based on Embodiment 3 (The figure corresponded in the cross section which cuts FIG. 16 by a XIX-XIX line). (A) And (b) is a schematic sectional drawing (figure equivalent to the section which cuts Drawing 17 along a XX-XX line) showing operation of the angle adjustment mechanism of the light intensity equalization element concerning Embodiment 3. FIG. 6 is a configuration diagram showing the inside of a projector that is a projection-type image display device according to a fourth embodiment. FIG. 10 is a configuration diagram schematically showing the inside of a rear projection type image display device according to a fifth embodiment.

<< 1 >> Embodiment 1
<< 1-1 >> Configuration of Embodiment 1 FIG. 1 is an external perspective view showing an angle adjustment mechanism 100 of a light intensity equalizing element, which is an angle adjustment mechanism of an optical element according to Embodiment 1 (on the light incident surface 1b side). (When viewed from diagonally above). FIG. 2 is an external perspective view showing the angle adjustment mechanism 100 of the light intensity equalizing element according to the first embodiment (when viewed from obliquely above the light emitting surface 1c side).

  In the following description, the optical element is a light intensity uniformizing element that transmits a light beam that illuminates the light modulation element in a projection-type image display device such as a projector or a projection television. However, the optical element is angle-adjusted by an angle adjustment mechanism. Is a light incident surface (reference numeral 1b in FIG. 5 described later), a light emitting surface (reference numeral 1c in FIG. 5 described later), and a plurality of side surfaces (reference numerals in FIG. 5 described later) connecting the light incident surface and the light emitting surface. As long as it is an optical element having 1d, 1e), an optical element other than the light intensity uniformizing element may be used.

  The light intensity equalizing element angle adjusting mechanism 100 according to the first embodiment includes a rod holder 2 as a holding member that holds a rod integrator 1 as a light intensity uniformizing element, and a light incident surface 1b side of the rod holder 2. The housing 3 includes a positioning portion (configuration 19 in FIG. 9 to be described later) with which the portion abuts, and supports the rod holder 2 so as to be rotatable about the positioning portion as a fulcrum. 5 is applied to a first force having a component in a first direction (+ z direction, vertical direction (upward direction) in FIG. 1) orthogonal to the optical axis 1a in FIG. 5 and parallel to the x direction. Orthogonal to both the optical axis 1a (x direction) and the first direction (z direction) to the third arm (first leaf spring of the leaf spring member 8) 17 as the force applying member 1 and the rod holder 2 Second direction (+ y direction) , A horizontal force in FIG. 1), a fourth arm (second leaf spring) 18 as a second force applying member for applying a second force having a component, and light directed to the positioning portion on the rod holder 2. A first coil spring 4a as a third force applying member for applying a third force having a component in the axis 1a direction, and a fourth force having a component in the optical axis 1a direction toward the positioning portion. The second coil spring 4b as a force applying member 4 and a force that resists a component of the first force in the first direction (z direction, the vertical direction in FIG. 1) are applied to the rod holder 2 to position the positioning portion. The first adjusting screw 9a as a first adjusting member that is rotated as a fulcrum and adjusts the position of the light emitting surface 1c of the rod integrator 1 with respect to the housing 3 in the first direction (± z direction, vertical direction in FIG. 1). And the second direction of the second force (y direction, in FIG. In the second direction (± y direction, in FIG. 1) of the light exit surface 1c of the rod integrator 1 with respect to the housing 3 by applying a force against the horizontal component) and rotating the rod holder 2 with the positioning portion as a fulcrum. A second adjustment screw 9b as a second adjustment member that adjusts the position in the horizontal direction) is a main configuration.

  As shown in FIGS. 1 and 2, the angle adjustment mechanism 100 of the light intensity equalizing element according to the first embodiment is configured so that the rod holder 2 is moved in the direction of the optical axis 1 a (−x direction) of the rod integrator 1 and above. The first coil spring 4a urged (pulled) in the direction (+ z direction) and the rod holder 2 are urged in the optical axis 1a direction (−x direction) and the lateral direction (+ y direction) of the rod integrator 1 ( A second coil spring 4b that is pulled), a first hook portion 5a that hooks the first coil spring 4a provided on the upper surface of the rod holder 2, and a second coil spring provided on the side surface of the rod holder 2. A second hooking portion 6a for hooking the coil spring 4b, a screw 7a for fixing the other end of the first coil spring 4a to the fixing portion 3a of the housing 3, and a second end of the second coil spring 4b for the housing 3 Fixed to the fixed part 3b And a ball screw 7b. In addition, the angle adjustment mechanism 100 of the light intensity equalizing element according to the first embodiment includes a leaf spring member 8 that urges (pushes) the rod holder 2 upward (+ z direction) and lateral direction (+ y direction); A first stopper 10a for limiting the upward rotation range (+ z direction) of the rod holder 2 and a second stopper for limiting the rotation range of the rod holder 2 in the left direction (+ y direction) in FIG. 10b, the drop-off prevention plate 11 for preventing the first adjusting screw 9a and the second adjusting screw 9b from falling off in FIG. 2, and the screws of the first adjusting screw 9a and the second adjusting screw 9b. Openings 11 a and 11 b of the drop-off prevention plate 11 provided above the head and screws 7 c for fixing the drop-off prevention plate 11 to the housing 3 are provided. In addition, in FIG. 1, the shape when the drop-off prevention plate 11 is removed is shown.

  FIG. 3 is an external perspective view (when viewed from obliquely above the light emitting surface 1c side) of the light intensity equalizing element angle adjusting mechanism 100 shown in FIG. 2 except for the housing and screws 7a and 7b. . FIG. 4 is an exploded perspective view of the configuration shown in FIG. 3 and 4, the right side of the rod integrator 1 is the light incident surface 1b side, and the left side is the light emitting surface 1c side. On the upper surface of the rod holder 2, a first contact plate 5 is fixed with screws 12a. The first abutting plate 5 is formed with a first hooking portion 5a for engaging one end of the first coil spring 4a and a vertical abutting surface 5b with which the tip of the first adjusting screw 9a abuts. Yes. Further, the second contact plate 6 is fixed to the bottom surface of the rod holder 2 with screws 12b. The second abutting plate 6 is formed with a second hooking portion 6a for engaging one end of the second coil spring 4b and a horizontal abutting surface 6b with which the tip of the second adjusting screw 9a abuts. Yes. The heights of the first hook portion 5a and the second hook portion 6a are set so that the first and second coil springs 4a and 4b are hooked horizontally. That is, the distance from the rod holder 2 of the fixed part to which the end of the first coil spring 4a of the housing 3 is connected is equal to the distance from the rod holder 2 of the first hooking part 5a, The distance from the rod holder 2 of the fixed part to which the end of the second coil spring 4b is connected is set to be equal to the distance from the rod holder 2 of the second hooking part 6a. By horizontally hooking the first and second coil springs 4a and 4b, the force for urging (pulling) the rod holder 2 in the direction of the optical axis 1a of the rod integrator 1 is maximized, and vibration and impact are applied. However, the rod holder 2 is less likely to be displaced in the direction of the optical axis 1a. In the first embodiment, the first hook portion 5a and the second hook portion 6a are integrated with the first pad plate 5 and the second pad plate 6, respectively, for cost reduction and assembly improvement. However, there is no functional problem even if they are formed separately or directly on the rod holder 2.

  The first hook portion 5a is bent at a right angle from the contact plate 5, and the first coil spring 4a is formed so as to be positioned substantially at the center (on the axis) of the rod holder 2 when the rod holder 2 is viewed from above. Has been. The second hooking portion 6a is bent three times at right angles from the contact plate 6, and is formed so that the second coil spring 4b is positioned substantially in the center when the rod holder 2 is viewed from the side. Further, by forming the first hook portion 5a and the second hook portion 6a in parallel, the first coil spring 4a and the second coil spring 4b can be arranged in the same posture. Coil springs with the same hook angle can be used. Furthermore, when the length in use and the generated load are the same, the first coil spring 4a and the second coil spring 4b can be used in common, and the cost can be reduced. There are advantages such as no mistakes.

  In addition, when aluminum is used as the material of the rod holder 2 in order to ensure moldability or improve heat dissipation, the first adjustment screw 9a and the second adjustment screw 9b are often made of iron. The tips of the first and second adjusting screws 9a and 9b may damage the surface of the rod holder 2, and the surface of the rod holder 2 may become rough or the surface may be scraped to generate fine powder. In such a case, the friction coefficient of the surface of the rod holder 2 with respect to the first and second adjustment screws 9a and 9b becomes large, which may hinder the rotating operation of the rod holder 2. Therefore, in the first embodiment, in order to protect the surface of the rod holder 2, the first and second contact plates 5, 6 are arranged on the surface of the rod holder 2, and the first and second adjusting screws 9a, 9b are arranged. It is prevented that the front-end | tip of this touches the rod holder 2 directly. The first and second contact plates 5 and 6 are preferably made of a material harder than the rod holder 2, and when the rod holder 2 is made of aluminum, a material having a higher surface hardness than aluminum, such as stainless steel, is used. It is preferable to do. In this way, the tips of the first and second adjustment screws 9a and 9b do not damage the surface of the rod holder 2.

  The plate spring member 8 that urges (pushes) the rod holder has a first arm 15 that urges (pushes) the light incident surface 1b side of the light beam of the rod holder 2 upward, and the light incident surface 1b of the light beam. A second arm 16 that urges (pushes) the side in the lateral direction, and a third arm 17 that urges (pushes) the surface on the opposite side of the first adjustment screw 9a against the second arm 16; A fourth arm 18 is provided to urge (push) the surface opposite to the side where the second adjusting screw 9b comes into contact. As a result, the light incident surface 1b side of the rod holder 2 can be held and the rod holder 2 can be rotated upward and laterally. In addition, the first arm 15 and the third arm 17 urge (push) the bottom surface of the rod holder 2, but the second arm 15 and the third arm 17 are in contact with the tip of the second arm 17 and the second arm 17. A contact plate 6 is disposed so as not to directly contact the bottom surface of the rod holder 2. In addition, the second arm 16 and the fourth arm 18 urge (push) the side surface of the rod holder 2, but the first arm 16 and the fourth arm 18 are in contact with the first arm at the place where the tips of the second arm 16 and the fourth arm 18 abut. The contact plate 5 is arranged so as not to directly contact the side surface of the rod holder 2. Therefore, the side surface and bottom surface of the rod holder 2 are not damaged, and the friction coefficient does not increase.

[Structure of rod holder 2]
FIG. 5 is an exploded perspective view showing the rod integrator 1 and the rod holder 2 shown in FIG. 4 upside down. The rod holder 2 includes a holder portion 201 and a lid 202 thereof. The rod integrator 1 is inserted into the holder portion 201, and the lid 202 is fixed with three screws 13a, 13b, and 13c from above. Since the rod integrator 1 falls off as it is, the rod integrator 1 is pushed to the holder part 201 side with the two screws 14a and 14b from the lid 202 side. At the same time, the rod integrator 1 is pressed and fixed to the inner surface of the holder portion 201 with the two screws 14 c and 14 d from the side surface of the holder portion 201. The optical axis 1a of the rod integrator 1 is a central axis that connects the center of the light exit surface 1c with the center of the light incident surface 1b. In the first embodiment, the elongated rectangular prism rod integrator 1 using glass or a transparent plastic material having a high light transmittance is used as the light intensity uniformizing element. However, four elongated rectangular mirrors are arranged on the inner side. You may use the light tunnel (light pipe) of the hollow structure combined toward direction. The screws 14a to 14c for fixing the rod integrator 1 are preferably plastic screws in order to prevent the surface of the rod integrator 1 from being damaged.

[Structure of leaf spring member 8]
FIG. 6 is an enlarged perspective view showing the leaf spring member shown in FIG. 4 in an enlarged manner. 7A and 7B are a side view and a front view showing the vicinity of the tips of the third and fourth arms 17 and 18, respectively. 8A and 8B are a side view and a front view showing the vicinity of the tips of the first and second arms 15 and 16, respectively. FIG. 6 shows the state of the leaf spring member 8 that urges (pushes) the rod holder 2 when it is free. The leaf spring member 8 shown in FIG. 4 shows a state in which the rod holder 2 is urged (pushed), that is, a state in use, and the first to fourth arms 15 to 18 are bent. It shows the state. The leaf spring member 8 is positioned by positioning holes 8a and 8b and fixed to the housing 3 by three screw fixing holes 8c, 8d and 8e. Also, oval projections 15a and 16a are formed at the tips of the first and second arms 15 and 16, respectively. The oval projections 15a and 16a are semi-columnar in the vicinity of the center in the width direction of the first and second arms 15 and 16, with the axial direction being the width direction of the first and second arms 15 and 16. A part is arranged, and a ¼ spherical part obtained by dividing the sphere into quarters is arranged at both ends of the semi-cylindrical part. Accordingly, when viewed from the front end side of the first and second arms 15 and 16, the protrusions 15a and 16a are connected to one quarter arc portion, a horizontal straight portion connected to the arc, and the straight portion. It looks like a shape (half-oval shape) composed of the other 1/4 arc portion. Further, when viewed from directly above, the protrusions 15a and 16a have one half arc part, two horizontal straight parts connected to the arc, and the other half part connected to the two straight parts. It looks like a shape (oval shape) composed of arc parts. The first and second arms 15 and 16 are for urging (pushing) the light incident surface 1b side of the rod holder 2 so that the position thereof does not shift in the vertical and horizontal directions. The protrusions 15 a and 16 a prevent the rod holder 2 from rotating about the optical axis 1 a of the rod integrator 1. Therefore, both the oval projections 15 a and 16 a are formed to be elongated in the direction perpendicular to the optical axis 1 a of the rod integrator 1. Thereby, the rod holder 2 is prevented from rotating.

  The oval projections 15a and 16a have curved surfaces so that the movement of the rod holder 2 is not restricted when the rod holder 2 rotates in the vertical and horizontal directions. If the tips of the first and second arms 15 and 16 are simply bent, their left and right ends become edges or rise, so that the rod holder 2 is caught on the surface of the rod holder 2 and turned. It becomes resistance to move. Therefore, oval projections 15a and 16a having no edge portions are formed at the tips of the first and second arms 15 and 16, respectively.

  Further, hemispherical protrusions 17a and 18a are formed at the tips of the third and fourth arms 17 and 18, respectively. The third and fourth arms 17 and 18 are for urging (pushing) the rod holder 2 upward and laterally and pressing the rod holder 2 against the tips of the first and second adjusting screws 9a and 9b. . Since the rod holder 2 rotates in both the vertical and horizontal directions when the angle is adjusted, the projections 17a and 18a at the tips of the third and fourth arms 17 and 18 are hemispherical, and in which direction the rod holder 2 moves. But I tried not to restrict the movement.

[Structure of housing 3]
FIG. 9 is an external perspective view (when viewed in the direction of the arrow Da in FIG. 2) showing the housing 3 of the angle adjusting mechanism of the light intensity equalizing element 1 shown in FIG. FIG. 9 shows the housing 3, and the upper surface 2 a on the light incident surface 1 b side of the rod holder 2 shown in FIG. 4 is placed on the first contact surface 19 a of the positioning portion 19 of the housing 3, and the light incident surface 1 b side. The side surface 2b of the positioning portion 19 is in contact with the second contact surface 19b of the positioning portion 19, and the end surface 2c on the light incident surface 1b side is in contact with the third contact surface 19c of the positioning portion 19 for positioning. Further, the upper surface 2 a of the rod holder 2 on the light incident surface 1 b side is urged (pressed) upward by the first arm 15 of the leaf spring member 8 and pressed against the first contact surface 19 a of the housing 3. It is done. The side surface 2b on the light incident surface 1b side is urged (pressed) in the lateral direction by the second arm 16 and pressed against the second contact surface 19b. The end surface 2c on the light incident surface 1b side is urged (pulled) in the direction of the optical axis 1a of the rod integrator 1 by the first and second coil springs 4a and 4b, and is pressed against the third contact surface 19c. The housing 3 is provided with a screw hole 20a into which the first adjustment screw 9a is fitted and a screw hole 20b into which the second adjustment screw 9b is fitted.

  Thereby, since the position of the light incident surface 1b of the rod integrator 1 is accurately positioned, the position of the light incident surface 1b of the rod integrator 1 does not shift even if the rod holder 2 rotates. Further, the rod holder 2 is held by the third arm 17 of the leaf spring member 8 because the rod holder 2 is rotatably held in the vertical and horizontal directions with the light incident surface 1b side as a rotation fulcrum ( It can be turned upward by being pushed, and can be turned laterally by being urged (pressed) by the fourth arm 18. Here, the first coil spring 4 a is hung so as to urge (pull) the rod holder 2 in the direction of the third contact surface 19 c of the housing 3, but from the optical axis 1 a of the rod integrator 1. Since it is arranged at a position shifted upward, in addition to the force for urging (pulling) the rod holder 2 in the direction of the optical axis 1a, a force for rotating the rod holder 2 upward is also generated. Further, since the second coil spring 4b is disposed at a position displaced laterally from the optical axis 1a of the rod integrator 1, in addition to a force that urges (pulls) the rod holder 2 in the direction of the optical axis 1a. In addition, a force for rotating the rod holder 2 in the lateral direction is also generated. That is, the first and second coil springs 4a and 4b also play an auxiliary role for rotating the rod holder 2 upward and laterally.

<< 1-2 >> Operation of Embodiment 1 FIGS. 10A and 10B are schematic cross-sectional views showing the operation of the angle adjustment mechanism of the light intensity uniformizing element according to Embodiment 1 (see FIG. It is a figure corresponding to the cross section cut by X-ray). 11A and 11B are schematic cross-sectional views showing the operation of the angle adjustment mechanism of the light intensity uniformizing element according to Embodiment 1 (the figure corresponding to the cross section taken along the line XI-XI in FIG. 3). is there. The operation of the angle adjusting mechanism 100 of the rod integrator 1 will be described. In FIG. 1, when the first adjusting screw 9a is turned in the loosening direction, the rod holder 2 is rotated upward with the light incident surface 1b as a fulcrum by the force received from the leaf spring member 8 ( When the first adjustment screw 9a is turned against the force received from the leaf spring member 8 in FIG. 10 (a), the rod holder 2 rotates downward (FIG. 10 (b)). When the second adjusting screw 9b is turned in the loosening direction, the rod holder 2 is rotated leftward by the force received from the leaf spring member 8 (FIG. 11A) and received from the leaf spring member 8. When the second adjustment screw 9b is turned in the direction of tightening against the force, the rod holder 2 rotates to the right (FIG. 11 (b)). The rod holder 2 is always urged (pulled) by the leaf spring member 8 and the first and second coil springs 4a and 4b in the direction toward the first and second adjustment screws 9a and 9b. Therefore, the position and the angle are maintained when the rotation ends in the vertical and horizontal directions. Therefore, it is not necessary to fix the state with another mechanism after the angle adjustment.

  12 (a) to 12 (c) are explanatory diagrams of the adjustment method of the illumination area of the angle adjustment mechanism 100 of the light intensity uniformizing element according to the first embodiment. Since the rod integrator 1 can be adjusted in angle as described above, for example, as shown in FIG. 12A, the illumination region L1 is shifted from the light receiving surface 21 of the DMD, and the light receiving surface 21 Even if the illumination beam does not hit a part of the beam, by adjusting the angle of the rod integrator 1 using the angle adjustment mechanism 100, for example, in the order of FIG. 12 (b) and FIG. 12 (c). The position of the illumination area L1 can be corrected and the entire light receiving surface 21 can be illuminated.

  As shown in FIG. 2, since the housing 3 is provided with the first stopper 10a, the rod holder 2 is rotated upward by turning the first adjusting screw 9a in the loosening direction. Further, the upper surface of the rod holder 2 is in contact with the tip of the first stopper 10a, and is restricted so as not to rotate more than necessary. Further, the second stopper 10b is rotated in the direction of loosening the second adjusting screw 9b, and when the rod holder 2 rotates rightward in FIG. 2, the side surface of the rod holder 2 contacts the second stopper 10b. It is restricted so that it does not rotate more than necessary. The drop-off prevention plate 11 is arranged so as to be covered over the heads of the screw heads of the first and second adjusting screws 9a, 9b, and the openings 11a, 11a, 11b is provided. When the first and second adjusting screws 9a and 9b are turned in the loosening direction, the rod holder 2 comes into contact with the first and second stoppers 10a and 10b and is further turned in the loosening direction. Sometimes, the screw head comes into contact with the drop-off prevention plate 11. In addition, the drop-off prevention plate 11 is disposed at such a height that the screw portions of the first and second adjustment screws 9a and 9b do not come out of the screw holes 20a and 20b of the housing 3. Even if the adjusting screws 9a and 9b are turned in the loosening direction, they will not fall out.

<< 1-3 >> Effect of Embodiment 1 As described above, since the angle adjustment mechanism 100 of the light intensity uniformizing element is configured, even if the illumination region L1 is deviated from the light receiving surface 21 of the DMD, By turning the first adjusting screw 9a and the second adjusting screw 9b in the tightening or loosening direction, the angle of the rod integrator 1 (the angle of the optical axis 1a) is adjusted, and the illumination region L1 covers the entire light receiving surface 21. It can be adjusted to the position to illuminate. By configuring in this way, it is not necessary to make the size of the illumination area L1 larger than the size of the light receiving surface 21 of the DMD in consideration of attachment errors. Can be approximately equal. As a result, illumination can be reduced without waste caused by illuminating a region other than the light receiving surface 21, and a bright image can be obtained.

  In addition, since the position of the illumination area L1 can be adjusted, high processing accuracy is not required for the component parts, and the assembly accuracy can be relaxed, so that the cost of parts and assembly is reduced, and the product yield is improved. There are also effects such as.

  In addition to the leaf spring member 8 that urges (pushes) the rod holder 2 upward and laterally, the first coil spring that urges (pulls) the rod holder 2 in the direction of the optical axis 1 a of the rod integrator 1. Since the 4a and the second coil spring 4b are provided, the position of the light incident surface 1b of the rod integrator 1 can be accurately positioned. Further, the angle of the rod integrator 1 can be adjusted while the position of the light incident surface 1b of the rod integrator 1 is fixed, and the light incident surface 1b of the rod integrator 1 is not displaced.

  Further, since the first and second coil springs 4a and 4b also have an action of rotating the rod holder 2 upward and laterally, the first and second coil springs 4a and 4b have a function of assisting the leaf spring member 8, and more reliably the rod holder. 2 can be rotated. Thereby, when the angle adjustment of the rod integrator 1 is performed, the movement of the rod holder 2 is poor and the rod integrator 2 is not stacked. The stack refers to a state in which the rod holder 2 does not rotate any more even if the first or second adjusting screw 9a, 9b is turned in the loosening direction.

  Further, the first coil spring 4a assists the operation of rotating the rod holder 2 upward, and the second coil spring 4b assists the operation of rotating the rod holder 2 laterally. Since the rotational movement in the direction is well balanced, the angle adjustment can be performed reliably without being stacked in only one direction.

  Moreover, since the urging force (pressing force) of the leaf spring member 8 can be set small by using the first and second coil springs 4a and 4b as an auxiliary to the leaf spring member 8, the leaf spring member 8 , The generated load of the third arm 17 and the fourth arm 18 that act to rotate the rod holder 2 can be set small. Thereby, the friction when rotating the rod holder 2 is reduced, and the rotating operation can be performed more smoothly.

<< 2 >> Embodiment 2
FIG. 13 is an external perspective view showing the angle adjustment mechanism 110 of the light intensity uniformizing element according to the second embodiment (when viewed obliquely from the light incident surface 1b side). FIG. 14 is an exploded perspective view showing a portion excluding the housing 25 and the screws 7a and 7b of the angle adjusting mechanism 110 of the light intensity equalizing element shown in FIG. 13 and 14, the same reference numerals are given to the same or corresponding components as those in the angle adjusting mechanism 100 of the light intensity uniformizing element described in the first embodiment. The angle adjustment mechanism 110 of the light intensity equalizing element according to the second embodiment is configured such that the height of the first hooking portion 23a that hooks the first coil spring 4a is higher than that of the first embodiment. The difference from the angle adjusting mechanism 100 of the light intensity equalizing element according to the first embodiment is that the second hooking portion 24a for hooking the second coil spring 4c is extended in the horizontal direction from the side surface of the rod holder 2. Further, regarding the housing 25, since the height of the first coil spring 4a is increased, the height of the fixing portion 25a for fixing the first coil spring 4a is also increased. The height of the fixing portion 25b that fixes the second coil spring 4c is substantially the same as the height of the fixing portion 3b of the first embodiment.

  In FIG. 14, the first contact plate 23 is formed with a first hook portion 23a for hooking the first coil spring 4a and a vertical contact surface 23b with which the tip of the first adjustment screw 9a abuts. ing. The difference from the first caulking plate 5 shown in the first embodiment is the height of the hole into which the hook of the first coil spring 4a of the first hooking portion 23a is fitted. The first coil spring 4a is hooked at a position higher than the first hook portion 5a. Further, the second contact plate 24 is formed with a second hooking portion 24a for hooking the second coil spring 4c and a horizontal contact surface 24b with which the tip of the second adjustment screw 9a abuts. . Since the second hooking portion 24a protrudes in the horizontal direction from the side surface of the rod holder 2, the hook of the second coil spring 4c is hooked from above. Therefore, the hooks at both ends of the first coil spring 4a face each other by 180 degrees, whereas the hooks at both ends of the second coil 4c face each other by 90 degrees.

  Since the first coil spring 4c is arranged at a position higher than the upper surface of the rod holder 2 as compared with the first embodiment, the rod holder 2 is urged (pulled) in the direction of the optical axis 1a of the rod integrator 1, and the rod holder 2 Although the force for pressing the end surface 2c on the light incident surface 1b side against the contact surface (not shown) of the housing 25 is slightly weakened, the force for rotating the rod holder 2 upward is increased. As a result, the rod holder 2 can be more strongly rotated, and when the rod holder 2 is rotated in the vertical direction, it becomes more difficult to stack. In addition, since the force for rotating the rod holder 2 upward is increased, the urging force (pressing force) of the third arm 17 of the leaf spring member 8 can be weakened. Since the frictional force between the tip of the arm 17 and the second contact plate 24 is reduced, the movement of the rod holder 2 in the left-right direction becomes smoother.

  On the other hand, the second catch plate 24 is bent three times to form the second hook 6a in the first embodiment, whereas the second hook in the second embodiment. The formation of 24a requires only two foldings, thereby reducing the number of processing steps and reducing the cost. In addition, since the number of bent portions is small and the shape is simple, the rigidity of the hooking portion 24a is increased, and even when pulled by the second coil spring 4c, it is difficult to be deformed. In addition, the second coil spring 4c has a different hook angle from that of the first coil spring 4a, so that even when the length and diameter are similar, an attachment error occurs during assembly. do not do.

  As described above, since the angle adjustment mechanism 110 of the light intensity equalizing element is configured, the angle adjustment of the rod integrator 1 can be performed more quickly and reliably, and the work for correcting the position of the illumination region L1 is facilitated. , Yield is improved.

  In addition, since the first coil spring 4a and the second coil spring 4c can be easily discriminated, it is possible to prevent erroneous hooking, improve the yield and shorten the assembly time.

  The effect obtained by the same or corresponding portion as the angle adjustment mechanism 100 of the light intensity uniformizing element shown in the first embodiment is the same as the effect described in the first embodiment.

<< 3 >> Embodiment 3
FIG. 15 is an external perspective view (when viewed from obliquely above the light incident surface 1b side) showing the angle adjustment mechanism 120 of the light intensity uniformizing element, which is the angle adjustment mechanism of the optical element according to the third embodiment. FIG. 16 is a side view showing the angle adjusting mechanism 120 of the light intensity equalizing element shown in FIG. FIG. 17 is a plan view showing the angle adjusting mechanism 120 of the light intensity equalizing element shown in FIG. 18 is an exploded perspective view showing a portion excluding the housing 26 of the angle adjusting mechanism 120 of the light intensity equalizing element shown in FIG. 15 to 18, the same reference numerals are given to the same or corresponding components as those shown in FIGS. 1 to 9 (Embodiment 1).

  The angle adjustment mechanism 120 of the light intensity equalizing element according to the third embodiment increases the height of the fixing portion 26a of the housing 26 for fixing the first coil spring 4d, and moves the first coil spring 4d to x. The point hung so as to incline in the xz plane with respect to the direction (horizontal direction), and the fixing portion 26b of the housing 26 for fixing the second coil spring 4e is extended in the lateral direction so that the position of the screw 7b is set. The angle adjusting mechanism of the light intensity equalizing element according to the first embodiment in that the second coil spring 4d is moved in the lateral direction and hung so as to be inclined in the xy plane with respect to the x direction (horizontal direction). 100. The hook portions 5a and 6a of the first and second coil springs 4d and 4e are the same as those in the first embodiment.

  In FIG. 16, the first coil spring 4d is slanted from the hook portion 5a toward the screw 7a fixed to the fixing portion 26a. That is, the distance from the rod holder 2 of the fixed portion 26a to which the end portion of the first coil spring 4d of the housing 26 is connected is longer than the distance from the rod holder 2 of the hook portion 5a. As described above, the pulling force in the oblique direction by the first coil spring 4d has a component in the x direction and a component in the z direction in FIG. 16, and the rod holder 2 is moved in the direction of the optical axis 1a of the rod integrator 1. Although the urging (pulling) force is weaker than in the first embodiment, the force for rotating the rod holder 2 in the z direction is stronger than in the first embodiment.

  In FIG. 17, the second coil spring 4e is slanted from the hooking portion 6a toward the screw 7b fixed to the fixing portion 26b. That is, the distance from the rod holder 2 of the fixed portion 26b to which the end portion of the second coil spring 4e of the housing 26 is connected is longer than the distance from the rod holder 2 of the hook portion 6a. As described above, the pulling force in the oblique direction by the second coil spring 4e has a component in the x direction and a component in the y direction in FIG. 17, and the rod holder 2 is moved in the direction of the optical axis 1a of the rod integrator 1. Although the urging (pulling) force is weaker than that in the first embodiment, the force for rotating the rod holder 2 in the y direction is stronger than that in the first embodiment.

  Thereby, it becomes possible to rotate the rod holder 2 more strongly, and when the rod holder 2 is rotated, it becomes more difficult to stack. Further, since the force for rotating the rod holder 2 is increased, the leaf spring member 27 is positioned with the first arm 28 for positioning and holding the light incident surface 1b side of the rod holder 2 as shown in FIG. It is also possible to eliminate the third and fourth arms (arms 17 and 18 in the first and second embodiments) that have only two arms 29 and urge (push) the rod holder 2 upward and laterally. It becomes possible. Further, since the third and fourth arms are eliminated, there is no resistance due to friction with the second contact plate 6, and the movement of the rod holder 2 during rotation is smoother.

  19A and 19B are schematic cross-sectional views showing the operation of the angle adjustment mechanism of the light intensity uniformizing element according to Embodiment 3 (the figure corresponding to the cross section taken along the line XIX-XIX in FIG. 16). is there. 20A and 20B are schematic cross-sectional views showing the operation of the angle adjustment mechanism of the light intensity uniformizing element according to Embodiment 3 (the figure corresponding to the cross section taken along line XX-XX in FIG. 17). is there. The operation of the angle adjusting mechanism 120 of the rod integrator 1 will be described. In FIG. 15, when the first adjustment screw 9a is turned in the loosening direction, the rod holder 2 rotates upward with the light incident surface 1b side as a fulcrum by the force received from the first coil spring 4d. However, when the first adjusting screw 9a is turned in the direction to be tightened against being received from the first coil spring 4d (FIG. 19A), the rod holder 2 is rotated downward (FIG. 19B). ). When the second adjusting screw 9b is turned in the loosening direction, the rod holder 2 is rotated leftward by the force received from the second coil spring 4e (FIG. 20A), and the second coil When the second adjusting screw 9b is turned against the force received from the spring 4e, the rod holder 2 rotates rightward (FIG. 20B). Further, the rod holder 2 is always urged (pulled) by the first and second coil springs 4a and 4b in the direction toward the first and second adjustment screws 9a and 9b. And when it finishes rotating in the left-right direction, its position and angle are maintained. Therefore, it is not necessary to fix the state with another mechanism after the angle adjustment.

  As described above, since the angle adjustment mechanism 120 of the light intensity uniformizing element is configured, the angle adjustment of the rod integrator 1 can be performed more quickly and reliably, and the work for correcting the position of the illumination region L1 is facilitated. , Yield is improved.

  Further, since the shape of the leaf spring member 27 is simplified, the cost can be reduced.

  In addition, since the hole opened in the leaf spring member 27 is closed and the rigidity of the leaf spring member 27 is improved, the posture of the rod holder 2 held by the leaf spring member 27 is stabilized. As a result, problems such as bending and holding of the rod holder 2 are eliminated, thereby improving performance and reliability.

  The effect obtained by the same or corresponding portion as the angle adjustment mechanism 100 of the light intensity uniformizing element shown in the first embodiment is the same as the effect described in the first embodiment.

<< 4 >> Embodiment 4
FIG. 21 is a configuration diagram showing the structure of the projection type image display apparatus 210 projector according to the fourth embodiment. The projection-type image display apparatus 210 according to Embodiment 4 includes a housing 57, a light source 50 that generates light, a DMD 54 as a light modulation element that forms an image based on an input signal, and light from the light source 50 as DMD 54. And a projection lens 67 as a projection optical system for enlarging and projecting the light beam modulated by the DMD 66 onto the screen 68. Note that a curved mirror may be added after the projection lens 55 that further enlarges the image to a wide angle as the projection optical system.

  The illumination optical system 150 includes an angle adjustment mechanism 100 of the rod integrator 1, a color wheel 51, a relay lens 52, and a reflection mirror 53. Further, when the image is further enlarged to a wide angle, a curved mirror may be added after the projection lens 55.

  The light beam irradiated from the lamp 50 is condensed on the light incident surface 1b of the rod integrator 1, and the intensity of the light beam is made uniform by the rod integrator 1 and converted into a shape close to the light receiving surface of the DMD 54. Next, the color wheel 51 adds RGB colors to the light rays in a time-sharing manner. The light beam collected by the relay lens 52 is folded back by the reflection mirror 53 to illuminate the light receiving surface of the DMD 54. The light beam to which the image information is added by the DMD 54 is enlarged by the projection lens 55 and projected onto the screen 56. As the light source, instead of the lamp light source 50, RGB (Light Emitting Diode) LEDs or RGB laser elements may be used. In this case, the color wheel 51 is unnecessary.

  In the projection type image display apparatus 200, as shown in FIG. 12A, when the illumination area L1 is shifted from the light receiving surface 21 of the DMD 54, an undesirable shadow is formed at the edge of the image projected on the screen 56. it can. Therefore, the illumination area L1 is adjusted to a position where the entire light receiving surface 21 of the DMD 54 is illuminated using the angle adjusting mechanism 100 of the rod integrator 1. From the state of FIG. 12A, the illumination area L1 is moved by turning the first adjusting screw 9a and the second adjusting screw 9b in the tightening direction, and for example, FIG. 12B and FIG. 12C. The position of the illumination area L1 can be adjusted so that the illumination area L1 is moved in this order and the entire light receiving surface 21 of the DMD 54 is covered.

  As described above, by adopting the angle adjustment mechanism 100 of the light intensity uniformizing element described in the first embodiment in the projection type image display apparatus 200, the periphery of the image does not become a shadow (dark part). A front projector capable of projecting a bright image can be obtained.

  In addition, although the case where the angle adjustment mechanism 100 of the light intensity uniformizing element of Embodiment 1 was used as the angle adjustment mechanism of the light intensity uniformizing element has been described, the angle adjustment of the light intensity uniformizing element of Embodiment 2 has been described. Even if the mechanism 110 or the angle adjustment mechanism 120 of the light intensity uniformizing element of the third embodiment is used, the same effect can be obtained.

<< 5 >> Embodiment 5
FIG. 22 is a block diagram schematically showing the structure of the projection type image display apparatus 210 according to the fifth embodiment. The projection type image display apparatus 210 according to the fifth embodiment forms an image based on an input signal, a housing 69, a laser light source 60 that generates a light beam, an optical fiber 61 that propagates a light beam from the laser light source 60, and the like. A DMD 66 as a light modulation element, an illumination optical system 151 that irradiates the DMD 66 with a light beam emitted from the optical fiber 61, a transmissive screen 68 provided on the front surface of the housing 69, and a light beam modulated by the DMD 66. A projection lens 67 is provided as a projection optical system for enlarging and projecting on the screen 68. A curved mirror may be added after the projection lens 67 as the projection optical system.

  The illumination optical system 151 includes a light intensity uniformizing element 1 that is an optical element that allows light emitted from the optical fiber 61 to pass through, an angle adjusting mechanism 100 that adjusts the angle of the light intensity uniformizing element 1, a relay lens 62, and the like. The first reflection mirror 63, the second reflection mirror 64, and the third reflection mirror 65 are included.

  The laser light source 60 includes RGB laser modules 60a, 60b, and 60c. Light beams emitted from the laser modules 60a, 60b, and 60c propagate through the optical fiber 61, and are emitted from the rod integrator 1. Incident on the incident surface 1b. The light beam incident on the rod integrator 1 is uniformized in intensity and converted into a shape close to the light receiving surface of the DMD 66. Next, the light beam condensed by the relay lens 62 is folded back by the first to third reflecting mirrors 63, 64, 65, and illuminates the DMD 66. The light beam to which the image information is added by the DMD 66 is enlarged by the projection lens 67 and projected from the back side of the screen 68. In addition, you may use a white lamp and LED (Light Emitting Diode) of RGB each color as a light source instead of a laser light source. However, in order to obtain a color image by using a white lamp, it is necessary to arrange a color wheel on the light incident surface 1b side or the light emitting surface 1c side of the rod integrator 1.

  In the projection type image display apparatus 210, as shown in FIG. 12A, when the illumination area L1 is displaced from the light receiving surface 21 of the DMD 66, an undesirable shadow is formed at the edge of the image projected on the screen 56. it can. Therefore, the illumination area L1 is moved using the angle adjustment mechanism 100 of the rod integrator 1, and the illumination position is adjusted so that the illumination area L1 covers the entire light receiving surface 21 of the DMD 66. From the state of FIG. 12A, the illumination region L1 is moved to the lower left by turning the first adjustment screw 9a and the second adjustment screw 9b, for example, FIG. 12B and FIG. 12C. In this order, the illumination area L1 can be adjusted.

  As described above, when the angle adjustment mechanism 100 of the light intensity uniformizing element described in the first embodiment is employed in the projection type image display apparatus 210, a shadow (position portion) may appear in the peripheral portion of the image. Therefore, it is possible to obtain a rear projection television that can project a bright image.

  In addition, although the case where the angle adjustment mechanism 100 of the light intensity uniformizing element of Embodiment 1 was used as the angle adjustment mechanism of the light intensity uniformizing element has been described, the angle adjustment of the light intensity uniformizing element of Embodiment 2 has been described. The same effect can be obtained when the mechanism 110 or the angle adjusting mechanism 120 of the light intensity uniformizing element of the third embodiment is used.

  DESCRIPTION OF SYMBOLS 1 Rod integrator (light intensity equalization element, optical element), 1a Optical axis, 2 Rod holder (holding member), 3,25,26 Housing, 4a 1st coil spring (3rd force provision member), 4b, 4c second coil spring (fourth force applying member), 4d first coil spring (first force applying member, third force applying member), 4e second coil spring (second force applying member) , Fourth force applying member), 5,23 first contact plate, 6,24 second contact plate, 5a, 23a first hooking portion, 5b, 23b vertical contact surface, 6a, 24a first 2 hooking parts, 6b, 24b horizontal contact surface, 8, 27 leaf spring member, 9a first adjusting screw (first adjusting member), 9b second adjusting screw (second adjusting member), 10a 1st stopper, 10b 2nd Stopper, 11 drop-off prevention plate, 11a, 11b opening, 15, 28 first arm (vertical arm), 16, 29 second arm (horizontal arm), 15a, 16a oval shaped projection, 17 third Arm (vertical arm, first force applying member), 18th arm (horizontal arm, second force applying member), 17a, 18a hemispherical protrusion, 50 lamp (light source), 54, 66 DMD (Light modulation element), 55, 67 projection lens (projection optical system), 56, 68 screen, 60 laser light source (light source), 100, 110, 120 angle adjustment mechanism of light intensity equalization element, 150, 151 illumination optical system 200,210 Projection-type image display device.

Claims (22)

A holding member for holding an optical element having a light incident surface, a light emitting surface, and a plurality of side surfaces connecting the light incident surface and the light emitting surface;
A housing that includes a positioning portion with which the light incident surface side portion of the holding member abuts, and supports the holding member rotatably with the positioning portion as a fulcrum;
A first force applying member that applies a first force having a component in a first direction perpendicular to the optical axis of the optical element to the holding member;
A second force applying member that applies a second force having a component in a second direction perpendicular to both the optical axis and the first direction to the holding member;
A third force applying member that applies a third force having a component in the optical axis direction toward the positioning portion to the holding member;
A fourth force applying member that applies a fourth force having a component in the optical axis direction toward the positioning portion to the holding member;
Applying a force against the first direction component of the first force to rotate the holding member with the positioning portion as a fulcrum, and the first direction of the light emitting surface of the holding member relative to the housing A first adjustment member for adjusting the position of
Applying a force against the second direction component of the second force to rotate the holding member with the positioning portion as a fulcrum, and the second direction of the light emitting surface of the holding member relative to the housing An angle adjustment mechanism for an optical element, comprising: a second adjustment member that adjusts the position of the optical element. The first force applying member includes a first leaf spring provided between the housing and the holding member,
The angle adjusting mechanism for an optical element according to claim 1, wherein the second force application member includes a second leaf spring provided between the housing and the holding member. The first leaf spring includes a hemispherical first protrusion that contacts the holding member;
The angle adjustment mechanism for an optical element according to claim 2, wherein the second leaf spring includes a hemispherical second protrusion that is in contact with the holding member. A first hook portion fixed to the holding member;
A second hook fixed to the holding member;
A first coil spring coupled between the housing and the first hook;
A second coil spring coupled between the housing and the second hook portion;
The first coil spring serves as the third force applying means,
The angle adjustment mechanism for an optical element according to any one of claims 1 to 3, wherein the second coil spring serves as the fourth force application unit. A first contact plate provided between a tip of the first adjustment member and the holding member;
A second contact plate provided between the tip of the second adjustment member and the holding member;
The first hook portion is formed integrally with the first contact plate,
The angle adjusting mechanism for an optical element according to claim 4, wherein the second hooking portion is formed integrally with the second contact plate. The first hook portion has a portion extending in the first direction from the holding member;
The angle adjusting mechanism for an optical element according to claim 4 or 5, wherein the second hooking portion includes a portion parallel to the first hooking portion. The first hook portion has a portion extending in the first direction from the holding member;
The angle adjustment mechanism for an optical element according to claim 4 or 5, wherein the second hooking portion has a portion extending from the holding member in the second direction. The distance from the holding member of the first fixed part to which the end of the first coil spring of the housing is connected is equal to the distance from the holding member of the first hook part,
The distance from the holding member of the second fixed portion to which the end of the second coil spring of the housing is connected is equal to the distance from the holding member of the second hook portion. The angle adjustment mechanism of the optical element according to claim 4 or 5. A first hook portion fixed to the holding member;
A second hook fixed to the holding member;
A first coil spring coupled between the housing and the first hook;
A second coil spring coupled between the housing and the second hook portion;
The first coil spring functions as the first force applying member and the third force applying means,
The angle adjusting mechanism for an optical element according to claim 1, wherein the second coil spring functions as the second force applying member and the fourth force applying means. A first contact plate provided between a tip of the first adjustment member and the holding member;
A second contact plate provided between the tip of the second adjustment member and the holding member;
The first hook portion is formed integrally with the first contact plate,
The angle adjusting mechanism for an optical element according to claim 9, wherein the second hooking portion is formed integrally with the second contact plate. The first hook portion has a portion extending in the first direction from the holding member;
The angle adjusting mechanism for an optical element according to claim 9 or 10, wherein the second hooking portion includes a portion parallel to the first hooking portion. The first hook portion has a portion extending in the first direction from the holding member;
The angle adjusting mechanism for an optical element according to claim 9 or 10, wherein the second hooking portion includes a portion extending from the holding member in the second direction. The distance from the holding member of the first fixed portion to which the end of the first coil spring of the housing is connected is longer than the distance from the holding member of the first hook portion,
The distance from the holding member of the second fixed portion to which the end portion of the second coil spring of the housing is connected is longer than the distance from the holding member of the second hooking portion. The angle adjustment mechanism of the optical element according to claim 9 or 10. The first adjustment member includes a first adjustment screw that rotates the holding member in a direction opposite to the first direction;
The optical according to any one of claims 1 to 13, wherein the second adjustment member includes a second adjustment screw that rotates the holding member in a direction opposite to the second direction. Element angle adjustment mechanism. A fifth force applying member that applies a fifth force pressing the holding member against the positioning portion to the holding member;
The sixth force applying member that applies a sixth force that presses the holding member against the positioning portion to the holding member, The method according to claim 1, further comprising: Angle adjustment mechanism for optical elements. The fifth force application member includes a third leaf spring provided between the housing and the holding member,
The angle adjustment mechanism for an optical element according to claim 15, wherein the sixth force application member includes a fourth leaf spring provided between the housing and the holding member. The portion of the third leaf spring that contacts the holding member includes a third protrusion having a contact portion that is wide in a first width direction orthogonal to both the optical axis direction and the first direction. ,
The portion of the fourth leaf spring that contacts the holding member includes a fourth protrusion having a contact portion that is wide in a second width direction orthogonal to both the optical axis direction and the second direction. The angle adjustment mechanism for an optical element according to claim 16.   11. The angle adjustment mechanism for an optical element according to claim 5, wherein the first contact plate and the second contact plate are made of a material harder than the holding member.   An opening attached to the housing and directly above the screw head of the first adjustment screw and the screw head of the second adjustment screw, the screw head of the first adjustment screw and the second adjustment screw The angle adjustment mechanism for an optical element according to claim 14 or 18, further comprising a drop-off prevention plate formed so as to cover both of the screw heads. A first stopper attached to the housing and restricting movement of the holding member in the first direction to a predetermined first position;
21. A second stopper attached to the housing and restricting movement of the holding member in the second direction to a predetermined second position. 2. An angle adjustment mechanism for an optical element according to item 1.   2. The optical element according to claim 1, wherein the optical element is a light intensity uniformizing element that equalizes light intensity in a plane perpendicular to the optical axis of light incident from the incident surface and emits the light from the light emitting surface. 21. The angle adjustment mechanism for an optical element according to any one of items 20 to 20. A light source that generates light rays;
A light modulation element for forming an image based on an input signal;
An illumination optical system for irradiating the light modulation element with the light beam;
A projection optical system for enlarging and projecting the light beam modulated by the light modulation element on a screen,
The illumination optical system includes:
A light intensity uniformizing element that is an optical element that transmits light from the light source;
The projection type image display apparatus comprising: the optical element angle adjusting mechanism according to any one of claims 1 to 21, which adjusts an angle of the optical element.

Images