JP5817264B2 - projector - Google Patents

Description

  The present invention relates to a projector.

Conventionally, in a projector, for the purpose of improving the contrast of a projected image, a configuration in which an optical compensation element (phase compensation plate) is disposed on a light incident side or a light emitting side of a light modulator is known (for example, Patent Document 1).
In the technique described in Patent Document 1, a transmissive liquid crystal panel is used as the light modulation device.
Further, the optical compensation element can be rotated (attitude adjustment) about a virtual line that is orthogonal to the optical axis of the incident light beam and is inclined with respect to the vertical and horizontal directions of the liquid crystal panel by the compensation element adjustment mechanism. It is arranged.

The compensation element adjustment mechanism includes a plate-shaped phase compensation plate bracket (adjustment member) that holds the optical compensation element, and an output polarizing plate bracket (support member) that rotatably supports the phase compensation plate bracket.
The phase compensation plate bracket is formed with two bent ribs protruding from the outside of the frame body portion to which the optical compensation element is fixed.
In addition, two V-groove parts for holding the phase compensation plate metal fitting are formed in the output polarizing plate metal fitting.
The phase compensation plate metal fitting is supported by the output polarizing plate metal fitting in a state where the two bent ribs are locked to the respective V groove portions of the output polarizing plate metal fitting. It becomes possible to rotate around a straight line (the imaginary line) connecting the locking positions.

JP 2010-54657 A

However, in the technique described in Patent Document 1, each bending rib of the phase compensation plate bracket is only locked to each V-groove portion. For this reason, the bending rib is easily displaced with respect to the V-groove portion when adjusting the posture of the optical compensation element or when transporting a unit in which the phase compensation plate is incorporated in the output polarizing plate.
That is, with respect to the output polarizing plate bracket, the phase compensation plate bracket moves in the in-plane direction of the plane orthogonal to the optical axis or rotates around the rotation center line (the imaginary line), thereby However, there is a problem that the phase compensation plate bracket is displaced and the bent rib is detached from the V-groove, so that the phase compensation plate bracket is dropped from the output polarizing plate bracket.

  An object of the present invention is to provide a projector that can prevent the adjustment member from falling off.

The projector according to the present invention includes a light modulation device that modulates an incident light beam, an optical compensation element that compensates for a phase difference of the light beam that has passed through the light modulation device, and the optical compensation element, and the position of the optical compensation element. an adjusting member for adjusting, and a supporting member supporting the adjustment member, said adjustment member includes an adjustment member body, and a pair of protrusions protruding in a direction away from each other, projecting from the adjusting member body has a projecting portion, wherein the support member includes a first upright portion of a pair of respectively opposite, located on both sides sandwiching the protruding portion, and a second upright portion of the pair of standing on the adjusting member, the a, wherein the first upright portion, the engaging portion is provided rotatably said protrusion of said adjustment member relative to the support member is engaged, the tip portion of the second upright portion, said sandwiching the adjusting member positioned on the opposite side, front Wherein the facing portion facing the protruding portion.

In the present invention, the support member has a pair of second upright portions that are located on both sides of the protruding portion of the adjustment member and rise up on the adjustment member side. Accordingly, the movement of the protruding portion in the in-plane direction of the plane orthogonal to the optical axis is restricted by the pair of second upright portions, and thus the movement of the adjusting member in the in-plane direction is prevented.
Moreover, the opposing part which is located in the front-end | tip part of a 2nd standing part and is located in the other side on both sides of an adjustment member , and opposes a protrusion part is provided. As a result, when the adjustment member rotates around the rotation center line, the adjustment member abuts against the opposing portion and further rotation is restricted, so that the protrusion of the adjustment member is a pair of second upright portions. It is prevented from coming off from between.
Therefore, the adjustment member can be prevented from being displaced with respect to the support member, and the protrusion of the adjustment member can be prevented from coming off from the engagement portion of the support member, so that the adjustment member can be prevented from falling off. .

Moreover , since the opposing part is provided in the front-end | tip part of a 2nd standing part, when an adjustment member moves to the standing direction of a 2nd standing part, an adjustment member contact | abuts to a facing part, and adjustment to the said direction is carried out. The movement of the member is restricted. For this reason, it can prevent reliably that the protrusion part of an adjustment member remove | deviates from between a pair of 2nd standing parts, and can further aim at prevention of the fall of an adjustment member.
Furthermore, since the facing portion is provided at the tip portion of the second upright portion, the configuration can be simplified compared to the case where the facing portion is provided separately from the second upright portion.

In the projector of the present invention, before Symbol adjustment member extends from said projecting portion, provided with an extending portion elastically deformable, the extending portion is preferably opposed to the facing portion.
In the present invention, since the extending portion can be elastically deformed, when the adjustment member is incorporated into the support member, the extending portion can be elastically deformed so that the extending portion faces the facing portion. For this reason, when incorporating an adjustment member in a support member, it can prevent that other parts in an adjustment member change.

In the projector according to the aspect of the invention, it is preferable that the extension portion is inclined to the side away from the support member.
In the present invention, since the extending portion is inclined toward the side away from the support member, the extending portion is easily guided along the shape of the inclined portion when the extending portion is opposed to the facing portion. For this reason, the workability | operativity at the time of incorporating an adjustment member in a support member can be improved.
Further, since the extension portion is inclined to the facing portion side when facing the facing portion, the extending portion is caught by the facing portion when coming into contact with the facing portion, and is difficult to come off from the facing portion. For this reason, it is possible to more reliably prevent the adjustment member from falling off.
In the projector according to the aspect of the invention, it is preferable that the engagement portion of at least one of the first upright portions of the pair of first upright portions is a cutout portion in which the first upright portion is cut out.

FIG. 2 is a diagram illustrating a schematic configuration of a projector according to the present embodiment. The figure which shows the structure of the optical compensation unit in this embodiment. The figure which shows the structure of the optical compensation unit in this embodiment. The perspective view which looked at the 1st adjustment member in this embodiment from the light-incidence side. The perspective view which looked at the 2nd adjustment member in this embodiment from the light-incidence side. The figure for demonstrating the attitude | position adjustment method of the optical compensation element in this embodiment. The figure for demonstrating the attitude | position adjustment method of the optical compensation element in this embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a diagram illustrating a schematic configuration of the projector 1.
The projector 1 projects an image and displays a projected image on a screen (not shown).
As shown in FIG. 1, the projector 1 includes an optical unit 3 that is housed in the exterior housing 2.

[Configuration of optical unit]
As shown in FIG. 1, the optical unit 3 includes a light source device 31 having a light source lamp 311 and a reflector 312, an illumination optical device 32 having lens arrays 321, 322, a polarization conversion element 323, and a superimposing lens 324, and a dichroic. A color separation optical device 33 having mirrors 331 and 332 and a reflection mirror 333, an incident side lens 341, a relay lens 343, a relay optical device 34 having reflection mirrors 342 and 344, and three incident side polarizing plates 35; Three liquid crystal panels 4 as light modulation devices, three optical compensation units 5, three output side polarizing plates 36, a cross dichroic prism 37 as a color synthesis optical device, and a projection lens 38 as a projection optical device, Is provided.
In the optical unit 3, the light beam emitted from the light source device 31 and passing through the illumination optical device 32 is made red (R), green (G), and blue (B) by the color separation optical device 33 with the above-described configuration. Separated into three colored lights. Each separated color light is modulated by each liquid crystal panel 4. The modulated color lights are combined by a prism 37 to form an image and projected onto a screen by a projection lens 38.

Here, the three liquid crystal panels 4, the three optical compensation units 5, and the three output-side polarizing plates 36 are not specifically illustrated, but are arranged on the light incident surfaces 371 (FIG. 1) of the prism 37. And are fixed through three fixing members (not shown).
In addition, since each member 31-38 mentioned above is a structure used with a general projector, below, only the structure of the liquid crystal panel 4 and the optical compensation unit 5 is demonstrated.

[Configuration of LCD panel]
As shown in FIG. 1, the three liquid crystal panels 4 are respectively disposed on the rear side of the optical path of each incident side polarizing plate 35.
Although not specifically shown, the liquid crystal panel 4 is, for example, a twisted nematic transmissive liquid crystal panel, and has a configuration in which liquid crystal molecules are hermetically sealed between a TFT substrate and a counter substrate. The liquid crystal panel 4 changes the alignment state of the liquid crystal molecules by applying a voltage based on a signal from a control device (not shown), and modulates the light beam emitted from the incident side polarizing plate 35.
In the following, for convenience of explanation, the liquid crystal panel 4 on the R color light side is referred to as a liquid crystal panel 4R, the liquid crystal panel 4 on the G color light side is referred to as a liquid crystal panel 4G, and the liquid crystal panel 4 on the B color light side is referred to as a liquid crystal panel 4B. 1).

As described above, the optical unit 3 employs the relay optical device 34.
For this reason, when each of the liquid crystal panels 4R, 4G, and 4B is constituted by a liquid crystal panel formed by the same manufacturing method, two of the R, G, and B color lights that do not follow the relay optical device 34. Although the incident state to the liquid crystal panels 4G and 4B on the color light sides of G and B is substantially the same, the incident state to the liquid crystal panel 4R on the R color light side following the relay optical device 34 is the light of each color light of G and B. Upside down and left and right are reversed with respect to the incident state to each liquid crystal panel 4 on the side. In such a state, color unevenness tends to occur in the image.

In this embodiment, in order to reduce the color unevenness that occurs in the image, the liquid crystal panels 4R and 4B are constituted by liquid crystal panels formed by the same manufacturing method, and the liquid crystal panel 4G is formed by the liquid crystal panels 4R and 4B. It is composed of a liquid crystal panel formed by a different manufacturing method.
That is, the three liquid crystal panels 4 are composed of two types of liquid crystal panels.
Specifically, the color light emitted from the liquid crystal panel 4G passes through the dielectric multilayer film 372 (FIG. 1) in the prism 37, and the respective color lights emitted from the remaining liquid crystal panels 4R and 4B are dielectric in the prism 37. Each color light from the liquid crystal panels 4R, 4G, and 4B is synthesized by being reflected by the body multilayer film 372.
Therefore, the light emitted from the left side of the liquid crystal panel 4G in the light traveling direction is combined with the light on the right side of the liquid crystal panels 4R and 4B.
From the above, each of the liquid crystal panels 4R and 4B and the liquid crystal panel 4G are constituted by liquid crystal panels formed by different manufacturing methods.

Specifically, the two types of liquid crystal panels are as follows.
That is, of the two types of liquid crystal panels, one liquid crystal panel rotates the rubbing direction of the TFT substrate 90 degrees to the left (counterclockwise) with respect to the rubbing direction on the opposite substrate side, and the liquid crystal molecules are twisted to the left. It is a set liquid crystal panel, a so-called L liquid crystal panel.
The other liquid crystal panel is a so-called R liquid crystal panel in which the rubbing direction of the TFT substrate is rotated 90 degrees to the right (clockwise) with the liquid crystal molecules set to the right twist with reference to the rubbing direction on the opposite substrate side. It is.
In this embodiment, each of the liquid crystal panels 4R and 4B is composed of an R liquid crystal panel, and the liquid crystal panel 4G is composed of an L liquid crystal panel.
In the following description, for convenience of description, the liquid crystal panels 4R and 4B are described as the first liquid crystal panel 41 (FIG. 1), and the liquid crystal panel 4G is described as the second liquid crystal panel 42 (FIG. 1).

[Configuration of optical compensation unit]
2 and 3 are diagrams showing the configuration of the optical compensation unit 5. Specifically, FIG. 2A is a view of the optical compensation unit 5 viewed from the light incident side, FIG. 2B is a side view of the optical compensation unit 5, and FIG. 2C is an optical compensation unit. It is the figure which looked at 5 from the light-projection side. FIG. 3 is an exploded perspective view of the optical compensation unit 5 as viewed from the light emitting side.
As shown in FIG. 1, the three optical compensation units 5 are respectively disposed between the liquid crystal panels 4 and the output-side polarizing plates 36.

The three optical compensation units 5 correspond to the two first optical compensation units 51 (FIG. 1) corresponding to the first liquid crystal panel 41 (4R, 4B) and the second liquid crystal panel 42 (4G). The second optical compensation unit 52 (FIG. 1) is composed of two types.
2 and 3, the configuration of the first optical compensation unit 51 is illustrated as the configuration of the optical compensation unit 5.
The first and second optical compensation units 51 and 52 have substantially the same configuration, and only the structure of the adjustment member 7 is different as will be described later. Therefore, in the following, the first optical compensation unit 51 will be mainly described, and for the second optical compensation unit 52, the same structure as the first optical compensation unit 51 is denoted by the same reference numeral, and the structure is Only the different adjustment members 7 will be mainly described.

[Configuration of First Optical Compensation Unit]
As shown in FIG. 2 or FIG. 3, the first optical compensation unit 51 includes an optical compensation element 6, an adjustment member 7, and a support member 8.
For the convenience of explanation, the adjustment member 7 constituting the first optical compensation unit 51 is referred to as the first adjustment member 7A, and the adjustment member 7 constituting the second optical compensation unit 52 is the second. The adjustment member 7B (see FIG. 5).

[Configuration of optical compensation element]
The optical compensation element 6 is a transparent plate made of a polymer such as glass or plastic, a plate-like member made of an inorganic or organic material having birefringence, or a plate-like member obtained by combining these, or a WV (Wide View) film. Etc. are attached.
This optical compensation element 6 has a phase that could not be accurately modulated by the liquid crystal panel 4 (the first liquid crystal panel 41 in the first optical compensation unit 51 and the second liquid crystal panel 42 in the second optical compensation unit 52). The modulation amount is finely adjusted (the phase difference of the light beam through the liquid crystal panel 4 is compensated) to improve the contrast of the projected image.

[Configuration of First Adjustment Member]
FIG. 4 is a perspective view of the first adjustment member 7A viewed from the light incident side.
The first adjustment member 7A is attached with the optical compensation element 6, and adjusts the position of the optical compensation element 6 by rotating around the first virtual line Ax1 (FIGS. 2 to 4).
The first adjusting member 7A is formed by processing a metal plate into a sheet metal, and as shown in FIG. 3 or FIG. 4, the adjusting member main body 71, a pair of arm portions 72, an operation portion 73, and an extension member. And an exit 74.
As shown in FIG. 3, the adjustment member main body 71 is composed of a rectangular plate having substantially the same size as the optical compensation element 6.
As shown in FIG. 3 or FIG. 4, the adjustment member main body 71 has a rectangular opening 711 for allowing a light beam to pass therethrough.
Then, as shown in FIG. 2C or 3, the optical compensation element 6 is attached so as to close the opening 711 on the light emitting side end face of the adjustment member main body 71.

As shown in FIG. 3 or FIG. 4, the pair of arm portions 72 are separated from each other along the first imaginary line Ax1 from the upper left corner portion C1 and the lower right corner portion C3 of the adjustment member main body 71 when viewed from the light incident side. Protrude in the direction. And a pair of arm part 72 has the substantially L shape by which the front-end | tip part 721 bent about 90 degrees toward the light-projection side, respectively.
The first virtual line Ax1 is the upper left corner and lower right corner of the optical compensation element 6 having a rectangular shape when viewed from the light incident side in a state where the optical compensation element 6 is attached to the first adjustment member 7A. It is a virtual line substantially parallel to a straight line connecting the parts.
In addition, in the pair of arms 72, the L-shaped outer portion of the distal end portion 721 has a cylindrical protrusion protruding in a direction away from each other along the first imaginary line Ax 1, as shown in FIG. 3 or FIG. Each part 722 is formed.

The operation unit 73 is a part operated from the outside.
As shown in FIG. 3 or FIG. 4, the operation portion 73 protrudes upward along the vertical axis from a substantially central portion in the left-right direction of the upper edge portion 71 </ b> U of the adjustment member main body 71.
Specifically, the distal end portion 731 of the operation portion 73 is in a state in which the adjustment member 7 is incorporated with respect to the support member 8, as shown in FIG. It protrudes to the upper side.
In other words, the operation unit 73 corresponds to a protrusion according to the present invention (hereinafter referred to as the protrusion 73).
Here, the left and right end portions 731A of the tip portion 731 are bent by approximately 90 ° toward the light emitting side, as shown in FIG. 3 or FIG. Further, the bent lower end portions of the left and right end portions 731A are bent by approximately 90 ° in a direction away from each other, and constitute an overhanging portion 731B projecting along a horizontal plane perpendicular to the vertical axis. The overhanging portion 731 </ b> B is used when the lower end surface 731 </ b> C is substantially parallel to the horizontal plane and the first adjustment member 7 </ b> A is fixed to the support member 8.

In the present embodiment, the protrusion 73 is set as shown below in order to improve the operability when adjusting the posture of the optical compensation element 6.
That is, as shown in FIG. 2B, the protrusion 73 has a base end (with respect to the adjustment member main body 71 such that the distal end portion 731 is located on the light emission side with respect to the plate surface of the adjustment member main body 71. The connection portion with the adjustment member main body 71 is slightly bent.
Further, the protrusion 73 is not specifically shown, but the adjustment member main body so that the left overhanging portion 731B is located on the light emitting side with respect to the right overhanging portion 731B when viewed from the light incident side. 71 is slightly twisted.

The extension portion 74 is a portion that faces a later-described facing portion 832 of the support member 8 when the adjustment member 7 is incorporated into the support member 8.
As shown in FIG. 3 or FIG. 4, the extending portion 74 includes a first direction portion 741 extending from the protruding portion 73 toward the arm portion 72 side of the upper left corner C1 as viewed from the light incident side, and a first direction portion 741. A second direction portion 742 extending in parallel with the protrusion 73 and a third direction portion 743 extending from the second direction portion 742 toward the protrusion 73. As described above, the extending portion 74 is formed in a U shape in plan view and extends to a position facing the facing portion 832 of the support member 8.

Here, in the present embodiment, the extending portion 74 is formed as described below in order to improve workability when the extending portion 74 is opposed to the facing portion 832.
That is, the extension 74 has a width dimension that is smaller than the width dimension of the adjustment member 7 and the width dimension of the protrusion 73 so that it can be elastically deformed.
In addition, as shown in FIG. 3 or FIG. 4, the extending portion 74 has the second direction portion 742 bent slightly toward the light emitting side with respect to the first direction portion 741. Further, the third direction portion 743 is bent toward the light emission side with respect to the second direction portion 742. As described above, the extending portion 74 is inclined so that the third direction portion 743, which is a portion facing the facing portion 832, is separated from the support member 8.

(Configuration of support member)
The support member 8 is a part that rotatably supports the adjustment member 7 when the posture of the optical compensation element 6 is adjusted and to which the adjustment member 7 is fixed after the posture adjustment.
The support member 8 is formed by subjecting a metal plate to sheet metal processing, and includes a support member main body 81, a pair of holding portions 82, and a pair of fixing portions 83, as shown in FIG.

As shown in FIG. 2 or 3, the support member main body 81 is configured by a substantially rectangular plate larger than the adjustment member main body 71.
And in this support member main body 81, the opening part 811 for allowing a light beam to pass through is formed in the center part.
In the support member main body 81, fixing holes 812 are formed at the four corners, respectively.
Although the four fixing holes 812 are not specifically shown, four pins (not shown) formed in the fixing member (not shown) fixed to the light incident surface 371 of the prism 37 are inserted. That is, it is used for fixing the optical compensation unit 5 to the light incident surface 371 of the prism 37.

The pair of holding portions 82 are portions that rotatably support the adjustment member 7 when adjusting the posture of the optical compensation element 6.
Specifically, as shown in FIG. 2 or FIG. 3, the pair of holding portions 82 are portions where both left and right end portions of the support member main body 81 are bent by approximately 90 ° toward the light emitting side.
In the pair of holding portions 82, the base end side (side close to the bent portion) is cut from the upper and lower edge portions toward the substantially central position in the vertical direction as shown in FIG. 2B or FIG. 3. Cutout portions 82A to 82D are formed.

In addition, in the pair of holding portions 82, the upper and lower end portions 821 to 824 on the distal end side (side away from the bent portion) are viewed from the light emitting side as shown in FIG. It is bent approximately 45 ° toward the opening 811.
Each of these end portions 821 to 824 faces the distal end portion 721 of the arm portion 72 of the adjustment member 7 in a state where the adjustment member 7 is incorporated into the support member 8.
For example, when the first adjustment member 7A is incorporated into the support member 8, as shown in FIG. 2C, the upper and lower left ends 821 and 823 are viewed from the light incident side. It opposes the front-end | tip part 721 of a pair of arm part 72 in 7 A of adjustment members.

As shown in FIG. 3, notches 821 </ b> A and 822 </ b> A with which the protrusions 722 of the adjustment member 7 are engaged are respectively formed at the end portions 821 and 822 on the fixing portion 83 side of the holding portion 82. Further, insertion holes 823A and 824A through which the protrusions 722 of the adjustment member 7 are inserted are formed in the end portions 823 and 824 on the side opposite to the fixing portion 83, respectively.
In the adjustment member 7, the protrusion 722 is inserted into the insertion holes 823A and 824A (for example, in the first adjustment member 7A, the protrusion 722 is inserted into the insertion hole 823A), and the protrusion 722 is notched. By being engaged with the portions 821A and 822A, the support member 8 is rotatably supported.
That is, each end part 821-824 is corresponded to the 1st standing part which concerns on this invention (henceforth the 1st standing part 821-824).
Moreover, the notches 821A and 822A and the insertion holes 823A and 824A correspond to the engaging portions according to the present invention.

The support member 8 includes four first upright portions 821 to 824 that face the tip portions 721 of the pair of arm portions 72 in the first and second adjustment members 7A and 7B, respectively.
Accordingly, it is not necessary to provide two types of support members, that is, a support member corresponding to the first adjustment member 7A and a support member corresponding to the second adjustment member 7B as the support member 8. That is, the support member 8 becomes a member that can be used in common for the first and second adjustment members 7A and 7B, and the manufacturing cost of the support member 8 can be reduced.

The pair of fixing portions 83 are portions to which the adjustment member 7 is fixed after the attitude of the optical compensation element 6 is adjusted.
Specifically, as shown in FIG. 2 or FIG. 3, the pair of fixing portions 83 are portions where a part of the upper end portion of the support member main body 81 is bent by approximately 90 ° toward the light emitting side. The distal end portion 832 of each fixing portion 83 is further bent by approximately 90 ° toward the central portion side of the support member main body 81. As described above, the fixing portion 83 rises from the support member main body 81 toward the adjustment member 7 side, and the tip end portion 832 is formed in a bowl shape.

As shown in FIG. 2, these pair of fixing portions 83 are provided on both the left and right sides sandwiching the protruding portion 73 of the adjustment member 7 when the adjustment member 7 is incorporated into the support member 8 as viewed from the light emitting side. Each is located. Further, the fixing portion 83 is disposed so as to cover the third direction portion 743 of the extending portion 74. Specifically, the fixing portion 83 is disposed at a position where the extension portion 74 of the adjustment member 7 is sandwiched between the support member main body 81 and the facing portion 832 when the adjustment member 7 is incorporated into the support member 8. The portion 832 faces the protruding portion 73 of the adjustment member 7.
That is, the fixing portion 83 corresponds to a second upright portion according to the present invention (hereinafter referred to as a second upright portion 83).
Further, the bent tip portion 832 corresponds to the facing portion according to the present invention (hereinafter referred to as the facing portion 832).

The upper end surfaces 831 of the pair of second upright portions 83 are predetermined with respect to the end surfaces 731C of the overhanging portion 731B of the adjustment member 7 when the adjustment member 7 is incorporated into the support member 8. Opposing with a gap in between.
Each upper end face 831 is formed to have a larger area than each end face 731C in consideration of the posture adjustment of the optical compensation element 6.

[Configuration of Second Optical Compensation Unit]
As described above, the second optical compensation unit 52 has the same configurations 6 to 8 as the first optical compensation unit 51, and the structure of the second adjustment member 7B is the same as the structure of the first adjustment member 7A. Only different.

[Configuration of Second Adjustment Member]
FIG. 5 is a perspective view of the second adjustment member 7B as viewed from the light incident side.
As shown in FIG. 7, the second adjustment member 7B is different from the first adjustment member 7A only in the formation positions of the pair of arm portions 72 and the extension portion 74.
Specifically, as shown in FIG. 5, the pair of arm portions 72 in the second adjustment member 7 </ b> B is formed from the upper right corner portion C <b> 2 and the lower left corner portion C <b> 4 in the adjustment member body 71 as viewed from the light incident side. Projecting in a direction away from each other along the line Ax2.
The second virtual line Ax2 is a straight line connecting the upper right corner and the lower left corner of the optical compensation element 6 when viewed from the light incident side in a state where the optical compensation element 6 is attached to the second adjustment member 7B. This is a virtual line substantially parallel to (a straight line intersecting the first virtual line Ax1).

The second adjustment member 7 </ b> B is incorporated in the support member 8, and the front end portions 721 of the pair of arm portions 72 are the first upright portions at the upper right and lower left when viewed from the light incident side of the support member 8. 822 and 824, respectively. Each protrusion 722 engages with the notch 822 </ b> A of the first upright portion 822 and is inserted through the insertion hole 824 </ b> A of the first upright portion 824. The second adjustment member 7 </ b> B is pivotally supported with respect to the support member 8.
Although not specifically shown, the protrusion 73 of the second adjustment member 7B is different from the first adjustment member 7A in order to improve the operability at the time of adjusting the posture of the optical compensation element 6, The adjustment member main body 71 is slightly twisted so that the left protruding portion 731B is located on the light incident side with respect to the right protruding portion 731B as viewed from the light incident side.

  On the other hand, as shown in FIG. 5, the extending portion 74 in the second adjustment member 7B extends from the protruding portion 73 toward the arm portion 72 side of the upper right corner C2 as viewed from the light incident side. The extending portion 74 extends to the second upright portion 83 on the left side of the protruding portion 73 as viewed from the light emitting side, that is, the second upstanding portion 83 on the notch portion 822A side. The extension portion 74 is sandwiched between the support member main body 81 and the facing portion 832 when the second adjustment member 7 </ b> B is incorporated into the support member 8.

[Attitude adjustment method of optical compensation element]
Next, a method for adjusting the attitude of the optical compensation element 6 will be described.
6 and 7 are diagrams for explaining a method of adjusting the posture of the optical compensation element 6. Specifically, FIG. 6 is a diagram for explaining a method of adjusting the attitude of the optical compensation element 6 constituting the first optical compensation unit 51, and FIG. 7 is an optical compensation element constituting the second optical compensation unit 52. FIG. 6 is a diagram for explaining a posture adjustment method 6;
First, the operator assembles three optical compensation units 5 (two first optical compensation units 51 and one second optical compensation unit 52).

Specifically, the operator assembles the first optical compensation unit 51 as shown below.
That is, the operator attaches the optical compensation element 6 to the first adjustment member 7A with an adhesive or the like.
In addition, the operator engages the protrusion 722 of the adjustment member 7 with the notches 821A and 822A of the support member 8 while inserting the protrusion 722 of the first adjustment member 7A into the insertion holes 823A and 824A of the support member 8. Combine. As a result, the protrusion 722 engages with the notches 821A and 822A and the insertion holes 823A and 824A, and the distal end portions 721 of the pair of arms 72 of the first adjustment member 7A are the pair of first uprights of the support member 8. It is assigned between the parts 821 and 823. As described above, the notches 821A and 822A are provided in the first upright portions 821 and 822 on the second upright portion 83 side, so that the protrusions 722 are easily engaged with the notches 821A and 822A and the insertion holes 823A and 824A. The workability when incorporating the adjustment member 7 into the support member 8 can be improved.

In this state, the pair of first upright portions 821 and 823 are elastically deformed in a direction away from each other and abut against the tip portions 721 of the pair of arm portions 72, respectively.
That is, the separation dimension between the pair of first upright portions 821 and 823 is set to be substantially the same or slightly smaller than the separation dimension between the tip portions 721 of the pair of arm portions 72.
Further, the operator incorporates the extending portion 74 of the adjustment member 7 between the support member main body 81 and the facing portion 832 of the second upright portion 83. Thus, the facing portion 832 faces the extending portion 74 on the opposite side of the supporting member main body 81 with the extending portion 74 interposed therebetween.

The operator also fixes the optical compensation element 6 to the second adjustment member 7B. And an operator assembles the 2nd optical compensation unit 52 by attaching the 2nd adjustment member 7B to the support member 8 similarly to the above.
In this state, similarly to the above, the pair of first upright portions 822 and 824 are elastically deformed in a direction away from each other, and abut against the tip portions 721 of the pair of arm portions 72, respectively.

Next, the operator uses the fixing member to connect the three liquid crystal panels 4, the three optical compensation units 5 assembled as described above, and the three output-side polarizing plates 36 to each light incident on the prism 37. Fix to the surface 371.
Next, the operator performs posture adjustment of each optical compensation element 6 constituting the three optical compensation units 5.
For example, the posture adjustment of the optical compensation element 6 constituting the first optical compensation unit 51 is performed as follows.
In other words, the worker uses an adjustment device (not shown) that adjusts the posture of the optical compensation element 6 to emit a light beam for posture adjustment toward the first liquid crystal panel 41.
Then, the operator confirms the projected image that is modulated by the first liquid crystal panel 41 and projected onto the screen via the optical compensation element 6, the exit-side polarizing plate 36, the prism 37, and a projection lens (not shown). However, the attitude adjustment of the optical compensation element 6 is performed so that the contrast of the projected image is maximized.

  That is, as shown in FIG. 6, the operator moves the first virtual line Ax1 by moving the tip end portion 731 of the protruding portion 73 protruding upward along the optical axis of the incident light beam. The first adjustment member 7A (optical compensation element 6) is rotated as the center.

Here, the adjustment member 7 is configured to be rotatable with respect to the support member 8 by an engagement structure having a protrusion 722, a notch 821A (822A), and an insertion hole 823A (824A). That is, the adjustment member 7 (optical compensation element 6) rotates (posture adjustment) with respect to the support member 8 in a state where the projection 722 is inserted through the insertion hole 823A (824A).
For this reason, at the time of adjusting the attitude of the optical compensation element 6, the rotation center lines (first and second virtual lines Ax1, Ax2) are difficult to shift, and the attitude of the optical compensation element 6 can be adjusted favorably.

Further, the pair of first upright portions 821, 823 (822, 824) abuts against the pair of arm portions 72 while being elastically deformed. For this reason, when the adjustment member 7 rotates, a frictional force corresponding to the elastic deformation of the first upright portions 821, 823 (822, 824) is generated between the first upright portions 821, 823 (822, 824) and the arm portion 72. Will occur.
That is, the adjustment member 7 is prevented from rotating unnecessarily due to the weight of the adjustment member 7 or the optical compensation element 6 due to the frictional force. For this reason, the attitude of the optical compensation element 6 can be adjusted (finely adjusted) with high accuracy.

  Furthermore, when the adjustment member 7 rotates, the protrusion 73 is restricted from moving in the in-plane direction perpendicular to the protrusion direction of the second upright portion 83 by the second upright portion 83. Further, although the movement of the protruding portion 73 in the protruding direction of the second upright portion 83 is allowed to a certain degree, the movement is restricted when the extended portion 74 comes into contact with the facing portion 832 of the second upright portion 83. The This prevents the protrusion 73 from coming off between the pair of second upright portions 83.

Then, the operator rotates the optical compensation element 6 as described above, and the position where the contrast of the projected image is maximized (the orientation of the optical axis of the optical compensation element 6 depends on the liquid crystal material and the orientation state of the liquid crystal panel 4). After being positioned at an appropriate position), the first adjustment member 7A is fixed to the support member 8 as shown below.
That is, the operator applies an adhesive (for example, a photo-curing adhesive) from the upper side of each overhanging portion 731B, and fixes each overhanging portion 731B to each second upright portion 83.

  As described above, after the attitude adjustment of the optical compensation element 6, the protrusion 73 located at a position separated from the rotation center line (first and second virtual lines Ax 1, Ax 2) of the adjustment member 7 with respect to the support member 8 is the support member 8. Fixed to. Thereby, for example, the adjustment member 7 is adjusted with respect to the support member 8 as compared with the configuration in which the adjustment member 7 is fixed at a position close to the rotation center line (first and second virtual lines Ax1, Ax2). Even when an external force is applied, the optical compensation element 6 can be favorably maintained in a desired posture after the posture adjustment.

Furthermore, the protruding portion 73 is formed with an overhang portion 731 </ b> B, and the support member 8 is formed with a second upright portion 83.
Thus, after adjusting the posture of the optical compensation element 6, when adhesive is applied from the upper side of the overhanging portion 731 </ b> B in order to fix the adjusting member 7 to the support member 8, Adhesive can be received at the end face 831 on the side, and the adhesive can be prevented from dripping and adhering to other parts such as the optical compensation element 6.

  Note that the attitude adjustment of the optical compensation element 6 constituting the second optical compensation unit 52 and the fixing of the second adjustment member 7B to the support member 8 are centered on the second imaginary line Ax2, as shown in FIG. As described above, except that the second adjustment member 7B (optical compensation element 6) is rotated, the description thereof is omitted.

  According to this embodiment described above, the following effects are obtained.

In the present embodiment, the support member 8 has a pair of second upright portions 83 that are located on both sides of the protruding portion 73 of the adjustment member 7 and stand on the adjustment member side. As a result, the movement of the projecting portion 73 in the in-plane direction of the plane orthogonal to the optical axis is restricted by the pair of second upright portions 83, and thus the movement of the adjustment member 7 in the in-plane direction is prevented. .
In the present invention, the support member 8 is provided with a facing portion 832 that is located on the opposite side of the adjustment member 7 and faces the adjustment member 7. As a result, when the adjustment member 7 rotates around the rotation center line, the adjustment member 7 comes into contact with the facing portion 832 and further rotation is restricted, so that the protrusion 73 of the adjustment member 7 is a pair. It is prevented from coming off between the second upright portions 83.
Therefore, it is possible to prevent the adjustment member 7 from being displaced with respect to the support member 8 and to prevent the protrusion 722 of the adjustment member 7 from being detached from the notches 821A and 822A and the insertion holes 823A and 824A of the support member 8. Therefore, the adjustment member 7 can be prevented from falling off.

Further, since the facing portion 832 is provided at the tip portion of the second standing portion 83, when the adjustment member 7 moves in the standing direction of the second standing portion 83, the adjusting member 7 contacts the facing portion 832, The movement of the adjustment member 7 in the direction is restricted. For this reason, it can prevent reliably that the protrusion part of the adjustment member 7 remove | deviates from between a pair of 2nd standing-up parts 83, and can further aim at prevention of drop-off | omission of the adjustment member 7. FIG.
Furthermore, since the opposing portion 832 is provided at the tip portion of the second upright portion 83, the support member 8 can have a simple configuration as compared with the case where the opposing portion 832 is provided separately from the second upstanding portion 83. it can.

  Further, since the extending portion 74 can be elastically deformed, when the adjustment member 7 is incorporated into the support member 8, the extending portion 74 can be elastically deformed so that the extending portion 74 faces the facing portion 832. . For this reason, when incorporating the adjustment member 7 into the support member 8, it is possible to prevent other portions of the adjustment member 7 from being deformed.

Further, since the extending portion 74 is inclined to the side away from the support member 8, the extending portion 74 is guided along the shape of the inclined portion when the extending portion 74 is opposed to the facing portion 832. It becomes easy. For this reason, the workability | operativity at the time of incorporating the adjustment member 7 in the support member 8 can be improved.
Further, since the extension portion 74 is inclined to the facing portion 832 side when facing the facing portion 832, the extending portion 74 is caught by the facing portion 832 when contacting the facing portion 832. 832 is less likely to come off. For this reason, the adjustment member 7 can be more reliably prevented from falling off.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment described above, the facing portion 832 is provided in the second standing portion 83, but the present invention is not limited thereto, and the facing portion 832 may be provided in a portion different from the second standing portion 83 in the support member 8.
In the above embodiment, the facing portion 832 is provided on the support member 8. However, a configuration in which the facing portion is provided on the adjustment member 7 may be employed.

In the embodiment, the insertion holes 823A and 824A are provided in the first upright portions 823 and 824 on the opposite side of the second upright portion 83 as the engaging portions in the support member 8, but the present invention is not limited to this. A cutout portion may be provided instead of the holes 823A and 824A.
In the above-described embodiment, the projecting portion 722 is provided on the arm portion 72, and the notch portions 821A and 822A and the insertion holes 823A and 824A are provided on the first upright portions 821 to 824. And the structure which provided the penetration hole and provided the projection part in the 1st standing part may be employ | adopted.
In the above-described embodiment, the distal end portions 721 of the pair of arm portions 72 are configured to be located on the inner side with respect to the first upright portions 821, 823 (822, 824). You may comprise so that it may be located in the outer side with respect to 1 standing part 821,823 (822,824).

  In the above embodiment, the liquid crystal panels 4R and 4B are the first liquid crystal panel 41 (R liquid crystal panel) and the liquid crystal panel 4G is the second liquid crystal panel 42 (L liquid crystal panel). Conversely, the liquid crystal panels 4R and 4B may be the second liquid crystal panel 42 (L liquid crystal panel), and the liquid crystal panel 4G may be the first liquid crystal panel 41 (R liquid crystal panel).

In the embodiment, the transmissive liquid crystal panel 4 is employed as the light modulation device. However, the present invention is not limited to this, and a reflective liquid crystal panel may be employed.
In the embodiment, the attitude adjustment method of the optical compensation element 6 is not limited to the attitude adjustment method described in the embodiment.
For example, in the above-described embodiment, the attitude adjustment of the optical compensation element 6 is performed while checking the projected image on the screen. However, the present invention is not limited thereto, and the attitude adjustment light beam emitted from the prism 37 is a CCD camera or the like. Alternatively, a method of performing posture adjustment while directly detecting may be adopted.

  The present invention can be used for projectors used in presentations, home theaters, and the like.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 4 ... Liquid crystal panel (light modulation apparatus), 6 ... Optical compensation element, 7 ... Adjustment member, 7A ... 1st adjustment member, 7B ... 2nd Adjustment member, 8 ... support member, 71 ... adjustment member body, 73 ... projection, 74 ... extension part, 83 ... second upright part, 821A, 822A ... notch (Engagement part), 722 ... projection part, 821-824 ... 1st standing part, 823A, 824A ... insertion hole (engagement part), 832 ... opposing part.

Claims (4)

A light modulation device that modulates the incident light beam;
An optical compensation element that compensates for a phase difference of a light beam via the light modulation device;
An adjustment member to which the optical compensation element is attached and adjusts the position of the optical compensation element;
And a support member for supporting the adjusting member,
The adjustment member is
An adjustment member body;
A pair of protrusions protruding in directions away from each other;
Anda projection projecting from the adjusting member body,
The support member is
A pair of first upright portions that face each other;
The protrusion located on both sides of the, has a pair of second upright portion erecting on the adjusting member,
The first upright portion is provided with an engaging portion with which the protruding portion engages the adjustment member to be rotatable with respect to the support member,
The projector is characterized in that a front end portion of the second upright portion is provided with a facing portion that is located on the opposite side of the adjustment member and faces the protruding portion . The projector according to claim 1 .
Before SL adjustment member extends from the front Symbol protrusion includes an extending portion elastically deformable,
The projector is characterized in that the extension portion faces the facing portion. The projector according to claim 2 ,
Projector, wherein the extending portion is are inclined on the side away from the front Symbol support member.   In the projector as described in any one of Claims 1-3,
  The engagement portion of at least one first upright portion of the pair of first upright portions is a cutout portion in which the first upright portion is cut out.
  A projector characterized by that.

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