JP5115365B2 - Optical device and projector - Google Patents

Description

  The present invention relates to an optical device and a projector.

Conventionally, in a projector, three light modulation devices (liquid crystal panels) that modulate a light beam emitted from a light source according to image information for each color light and each color light modulated by each light modulation device are combined and emitted. An optical device (prism structure) integrated with a color synthesis optical device (cross dichroic prism) is used (for example, see Patent Document 1).
In the optical device described in Patent Document 1, in order to improve the viewing angle dependency generated in the light modulation device, a viewing angle compensation plate is disposed between the light modulation device and the color synthesis optical device, and An adjustment structure for adjusting the posture of the angle compensation plate is provided.

Specifically, the viewing angle compensation plate is held by the exit side optical element holding member. The emission side optical element holding member is fixed to a plate-like holding member fixed to the color synthesizing optical device.
The holding member is formed with an arcuate guide hole centered on the optical axis of the light beam applied to the viewing angle compensation plate.
Further, the exit side optical element holding member has a shape that protrudes from the upper edge of the exit side optical element holding member to the light beam exit side, and the tip portion is inclined with respect to the exit side optical element holding member, A gripping part that presses the holding member against the emission side optical element holding member is provided. Further, a pin that is inserted into the guide hole of the holding member is formed at the tip portion of the grip portion.
Then, the exit side optical element holding member rotates around the optical axis while the pin is guided along the guide hole while being pressed against the holding member by the elastic force of the grip portion. That is, the viewing angle compensation plate rotates together with the emission side optical element holding member, and the posture is adjusted.

JP 2006-259256 A

By the way, in the adjustment structure described in Patent Document 1, when a force is applied to the emission side optical element holding member to rotate the holding member, the holding member is pressed against the emission side optical element holding member. Power will be added. And since the pin inserted in a guide hole is provided in the holding part, there exists a possibility that a pin may pull out from a guide hole with the force added to a holding part. That is, the adjustment structure described in Patent Document 1 has a problem that it is difficult to adjust the viewing angle compensation plate in a good posture.
Therefore, there is a demand for a technique capable of satisfactorily adjusting the posture of an optical element such as a viewing angle compensator disposed on the light beam exit side of the light modulator.

  An object of the present invention is to provide an optical device and a projector capable of satisfactorily adjusting the posture of an optical element.

  The optical device according to the present invention includes a plurality of light modulation devices that modulate a plurality of color lights according to image information for each color light, and a plurality of light beam incident side end faces facing the light modulation devices. An optical device including a color combining optical device that forms image light by combining the color lights modulated by the optical element, and an optical element disposed on a light beam emission side of the light modulation device, and the light modulation device And an element holder that holds the optical element interposed between the light beam incident side end faces, and a fixing member that supports the light modulator and the element holder and fixes the element to the light beam incident side end face. The holding body holds the optical element, and is connected to a plate-like holding portion disposed to face the fixing member and an outer edge of the holding portion, and the fixing member is interposed between the holding portion and the holding member. Clamp and urge the fixing member toward the holding portion A guide hole extending in an arc shape around the optical axis of the light beam incident on the optical element, and the guide An adjustment structure is provided that includes an insertion protrusion that is inserted into the hole, and that adjusts the posture of the element holder relative to the fixing member by guiding the insertion protrusion along the extending direction of the guide hole. It is characterized by being.

  In the present invention, the element holder includes a holding portion and an urging portion, and is supported by the fixing member in a state where the holding portion is pressed against the fixing member by the urging portion. And the adjustment structure which adjusts the attitude | position of an element holding body with respect to a fixing member is provided in the site | part except the biasing part in an element holding body, and a fixing member. That is, since the guide hole or the insertion protrusion is provided in a portion excluding the biasing portion, even if a force is applied to the biasing portion by applying a force to the element holding body, the insertion protrusion from the guide hole. The portion can be prevented from coming off, and the state where the insertion protrusion is inserted into the guide hole can be maintained well. Therefore, when the element holding member is rotated with respect to the fixing member, the insertion protrusion is well guided along the extending direction of the guide hole, and the posture of the optical element can be adjusted satisfactorily.

In the optical device according to the aspect of the invention, the element holding body includes a parallel surface portion that is connected to an outer edge of the holding portion and is parallel to the holding portion, and the fixing member is inserted between the parallel surface portion and the holding portion. Preferably, the guide portion or the insertion protrusion is provided on the parallel surface portion.
By the way, in the conventional structure, the front-end | tip part of a holding part has the shape inclined with respect to the injection | emission side optical element holding member. And since the pin is provided in the front-end | tip part of a holding part, a pin will also be inserted in a guide hole in the state inclined with respect to the opening surface of a guide hole. For this reason, the engagement state of the pin with respect to the guide hole tends to become unstable.
In the present invention, the element holder includes an insertion portion having a parallel surface portion that balances the holding portion, and a guide hole or an insertion protrusion is provided in the parallel surface portion. Accordingly, the insertion protrusion is inserted into the guide hole in a state orthogonal to the opening surface of the guide hole, and the engagement state of the insertion protrusion with respect to the guide hole can be stabilized.

In the optical device according to the aspect of the invention, it is preferable that the urging portions are provided at positions facing each other across the adjustment structure as viewed from the direction along the optical axis.
According to the present invention, since the two urging portions are arranged so as to sandwich the adjustment structure, when the element holding member is rotated with respect to the fixing member, the two urging portions cause the element against the fixing member. It is possible to stabilize the support state of the holding body and to stabilize the engagement state (engagement state of the insertion protrusion with respect to the guide hole) in the adjustment structure.

In the optical device according to the aspect of the invention, it is preferable that the adjustment structures are respectively provided at positions facing each other across the biasing portion when viewed from the direction along the optical axis.
In the present invention, since the two adjustment structures are arranged so as to sandwich the urging portion, when the element holding body is rotated with respect to the fixing member, it is fixed by one urging portion that is required at a minimum. While the element holder is supported by the member, the engagement state of the element holder with respect to the fixed member can be stabilized by the two adjustment structures.

In the optical device according to the aspect of the invention, the portion of the element holding member excluding the urging portion and the fixing member slide along the sliding surface extending in parallel with the guide hole and the sliding surface. It is preferable that the 2nd adjustment structure provided with a sliding protrusion part is provided.
In the present invention, the second adjustment structure is provided in a portion excluding the urging portion in the element holder and the fixing member. As a result, when the element holding body is incorporated into the fixing member, the insertion protrusion and the sliding protrusion come into contact with the inner peripheral edge and the sliding surface of the guide holes extending in parallel with each other, so that the element holding body The substantially center position of the held optical element can be matched with the optical axis of the incident light beam, and the optical element can be easily positioned in the optical device. Further, since the portion between the guide hole and the sliding surface is sandwiched between the insertion protrusion and the sliding protrusion, the guide hole and the sliding surface are also turned when the element holder is rotated with respect to the fixing member. It is possible to prevent the position of the element holder from shifting in a direction orthogonal to the direction. That is, it is possible to satisfactorily maintain a state in which the substantially center position of the optical element is coincident with the optical axis of the incident light beam, and it is possible to avoid a positional shift of the optical element.

The projector according to the present invention includes a light source device, the above-described optical device, and a projection optical device that enlarges and projects image light formed by the optical device.
According to the present invention, since the projector includes the optical device described above, the projector can enjoy the same operations and effects as the optical device described above.
In addition, since the projector includes an optical device that can satisfactorily adjust the posture of the optical element such as a viewing angle compensator, a good projection image can be displayed.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a diagram showing a schematic configuration of a projector 1 in the first embodiment.
The projector 1 modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects the formed image light on a screen (not shown). As shown in FIG. 1, the projector 1 includes an exterior casing 2 that constitutes an exterior, an optical unit 3, a projection lens 4 as a projection optical device, and the like.
Although not specifically shown in FIG. 1, a cooling fan or the like for cooling each component in the projector 1 is provided in a space other than the optical unit 3 and the projection lens 4 in the exterior housing 2. It is assumed that a cooling unit provided, a power supply unit that supplies power to each component in the projector 1, a control device that controls each component in the projector 1, and the like are arranged.

The optical unit 3 optically processes the light beam emitted from the light source device 31 under the control of the control device to form image light corresponding to the image information. As shown in FIG. 1, the optical unit 3 includes a light source device 31, an illumination optical device 32, a color separation optical device 33, a relay optical device 34, an optical device 5, and these optical components 31 to 34. 5 is disposed at a predetermined position with respect to the illumination optical axis Ax set inside.
The light source device 31 includes a light source lamp 311 and a reflector 312. In the light source device 31, the light beam emitted from the light source lamp 311 is aligned in the emission direction by the reflector 312, and is emitted toward the illumination optical device 32.

  The illumination optical device 32 includes a first lens array 321, a second lens array 322, a polarization conversion element 323, and a superimposing lens 324. Then, the light beam emitted from the light source device 31 is divided into a plurality of partial light beams by a plurality of small lenses (not shown) constituting the first lens array 321, and a plurality of small lenses (second lens array 322). The image is formed near (not shown). Each partial light beam emitted from each small lens of the second lens array 322 is incident so that its central axis (principal ray) is perpendicular to the incident surface of the polarization conversion element 323. It is emitted as a kind of linearly polarized light. A plurality of partial light beams emitted from the polarization conversion element 323 as linearly polarized light and passed through the superimposing lens 324 are superimposed on three light modulation devices 51 (liquid crystal panel 511) described later of the optical device 5.

The color separation optical device 33 includes two dichroic mirrors 331 and 332, and a reflection mirror 333. A plurality of partial light beams emitted from the illumination optical device 32 by the dichroic mirrors 331 and 332 and the reflection mirror 333 are red, It has a function of separating light into three colors of green and blue.
The relay optical device 34 includes an incident side lens 341, a relay lens 343, and reflection mirrors 342 and 344, and color light separated by the color separation optical device 33, for example, red light, which will be described later on the red light side of the optical device 5. It has a function of guiding to the light modulation device 51R.

  The optical device 5 modulates the incident light beam according to image information to form image light. The optical device 5 includes three light modulation devices 51 (light modulation on the red (R) color light side) having three incident-side polarizing plates 52 and a liquid crystal panel 511 (see FIGS. 2 and 3) in order from the front side of the optical path. The device is 51R, the light modulation device on the green (G) color light side is 51G, and the light modulation device on the blue (B) light side is 51B), three viewing angle compensation plates 53 as optical elements, and three exits A side polarizing plate 54 and a cross dichroic prism 55 as a color synthesis optical device are provided.

The incident-side polarizing plate 52 transmits only linearly polarized light having a polarization direction substantially the same as the polarization direction aligned by the polarization conversion element 323.
The liquid crystal panel 511 is a transmissive liquid crystal panel, and changes the arrangement of liquid crystal molecules enclosed in a plurality of liquid crystal cells (pixels) arranged in a matrix based on a drive signal from the control device. The polarization direction of the linearly polarized light emitted from the side polarizing plate 52 is modulated.
The viewing angle compensator 53 compensates for a phase difference generated between ordinary light and extraordinary light due to birefringence generated in the liquid crystal panel 511, and improves the clear vision characteristics of the liquid crystal panel 511.
The exit-side polarizing plate 54 transmits only linearly polarized light having a polarization direction orthogonal to the transmission axis of the incident-side polarizing plate 52 out of the light flux emitted through the liquid crystal panel 511 and the viewing angle compensation plate 53.

  The cross dichroic prism 55 combines the color lights transmitted through the exit-side polarizing plates 54 to form image light (color image). The cross dichroic prism 55 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. These dielectric multilayer films transmit G color light and reflect R and B color light. Then, by passing through the cross dichroic prism 55, the color lights transmitted through the exit-side polarizing plates 54 are combined to form a color image.

Among the members 51 to 55 described above, each light modulation device 51, each viewing angle compensation plate 53, each exit-side polarizing plate 54, and the cross dichroic prism 55 are integrated to form an optical device body 5A (FIG. 2). FIG. 3). The optical device main body 5A may employ a configuration in which the incident-side polarizing plates 52 are integrated in addition to the members 51 and 53 to 55.
A specific configuration of the optical device body 5A will be described later.

  The projection lens 4 is configured as a combined lens in which a plurality of lenses are combined, and enlarges and projects the image light emitted from the optical device 5 on the screen.

[Configuration of optical device body]
2 and 3 are diagrams showing the configuration of the optical device body 5A. Specifically, FIG. 2 is a perspective view showing a state where the optical device body 5A is integrated. FIG. 3 is an exploded perspective view in which the G color light side in the optical device body 5A is disassembled.
In FIG. 3, in the optical device main body 5A, only the G color light side is disassembled, but the other R color light side and B color light side have the same configuration as the G color light side.
As shown in FIG. 2 or FIG. 3, the optical device main body 5A includes the light modulators 51, the viewing angle compensation plates 53 (FIG. 3), the exit-side polarizing plates 54 (FIG. 3), and the cross dichroic prism. In addition to 55, three fixing members 6 and three element holders 7 are provided, and these members 51, 53 to 55, 6, and 7 are integrated.

The light modulation device 51 includes a panel holding frame 512 that stores and holds the liquid crystal panel 511 described above.
The panel holding frame 512 has a rectangular shape in plan view, and has an opening 512 </ b> A corresponding to the image forming area of the liquid crystal panel 511 at a substantially central portion.
In the panel holding frame 512, although not shown in the drawings on the light beam exit side, a storage recess for storing and holding the liquid crystal panel 511 corresponding to the outer shape of the liquid crystal panel 511 is provided at the peripheral portion of the opening 512A. Is formed.
Further, in the panel holding frame 512, fixing holes 512 </ b> B for fixing the light modulation device 51 to the fixing member 6 are respectively formed at the four corner portions.

The fixing member 6 is disposed between the light modulation device 51 and the cross dichroic prism 55, supports the light modulation device 51, the exit-side polarizing plate 54, and the element holder 7, and the end surface on the light flux incident side of the cross dichroic prism 55. It is a member fixed with respect to 55A (FIG. 3). The fixing member 6 includes a first fixing portion 8 and a second fixing portion 9.
As shown in FIG. 3, the first fixing portion 8 is formed by subjecting a metal plate to sheet metal processing, and has a substantially rectangular shape in plan view having a rectangular opening 811 in a substantially central portion. The first plate-like portion 81 and four pins 82 protruding from the four corner portions of the first plate-like portion 81 toward the light beam incident side.
Of the four pins 82, the two pins 82A and 82B positioned on the upper side are configured to protrude from the first plate-shaped portion 81 to the light beam incident side by being bent with the vertical direction as a bending axis in FIG. Has been. Further, the two pins 82C and 82D located on the lower side are configured to protrude from the first plate-like portion 81 to the light beam incident side by being bent with the horizontal direction as a bending axis in FIG.
In the first fixing portion 8, the first plate-like portion 81 is fixed to the light incident side end face 55A with an adhesive or the like.

4 and 5 are perspective views showing the configuration of the second fixing portion 9. Specifically, FIG. 4 is a perspective view of the second fixing portion 9 as viewed from the light beam incident side, and FIG. 5 is a perspective view of the second fixing portion 9 as viewed from the light beam emission side.
The second fixing portion 9 is formed by subjecting a metal plate to sheet metal processing. As shown in FIG. 4 or FIG. 5, the second fixing portion 9 is a plan view having a rectangular opening 911 at a substantially central portion. A substantially rectangular second plate-shaped portion 91 and a pair of upstanding pieces 92 that rise from the left and right edges of the second plate-shaped portion 91 toward the light beam incident side are provided.
In the second plate-shaped portion 91, a guide hole that extends in an arc shape around the optical axis (illumination optical axis Ax shown in FIG. 1) of the light beam that penetrates the front and back and irradiates the viewing angle compensation plate 53 on the upper side. 912 is formed.
Further, in the second plate-shaped portion 91, the upper side edge 913 is formed to have an arc shape in parallel with the guide hole 912.

Further, in the second plate-shaped portion 91, insertion holes 914 are formed at four corner portions corresponding to the four pins 82, respectively. That is, by inserting the four pins 82 into the respective insertion holes 914, the second fixing portion 9 is supported by the first fixing portion 8 (see FIG. 9), and an adhesive is applied between the pins 82 and the insertion holes 914. Thus, the second fixing portion 9 is fixed to the first fixing portion 8.
Further, in the second plate-like portion 91, a lower portion 915 of the opening 911 is formed in a stepped manner on the light emission side. Furthermore, a position restricting portion 916 that protrudes toward the light beam exit side is formed at the left edge of the opening 911 in FIG.
The exit-side polarizing plate 54 is attached to the end surface of the second plate-shaped portion 91 on the light-emission side with an adhesive or the like with the outer peripheral edge positioned in contact with the lower portion 915 and the position restricting portion 916. (See FIG. 9).

As shown in FIG. 4, in the pair of upright pieces 92, plate-like protrusions 921 that are parallel to the second plate-like part 91 and protrude toward the other upright piece 92 are provided at the upper and lower end portions. Is formed.
Of the protrusions 921, screw holes 9211 corresponding to the fixing holes 512 </ b> B are formed in the protrusions 921 </ b> A and 921 </ b> B at diagonal positions as viewed from the direction along the optical axis. Then, two screws 93 (FIGS. 2 and 3) are screwed into the screw holes 9211 through the two fixing holes 512 </ b> B, so that the light modulation device 51 is fixed to the second fixing portion 9.

6 to 8 are diagrams showing the configuration of the element holder 7. Specifically, FIG. 6 is a perspective view of the element holder 7 viewed from the light beam incident side, and FIG. 7 is a perspective view of the element holder 7 viewed from the light beam exit side. FIG. 8A is a plan view of the element holder 7 as viewed from the light beam exit side, and FIG. 8B is a cross-sectional view taken along line AA in FIG. 8A.
FIG. 9 is a view showing a state in which the element holder 7 is incorporated in the fixing member 6. Specifically, FIG. 9A is a plan view of the assembled state as seen from the light incident side, and FIG. 9B is a cross-sectional view taken along line BB in FIG. 9A.
The element holder 7 is formed by subjecting a metal plate to sheet metal processing, and is disposed between the pair of upright pieces 92 to hold the viewing angle compensation plate 53. As shown in FIGS. 6 to 8, the element holding body 7 includes a holding portion 71, two urging portions 72, and an insertion portion 73.

The holding portion 71 has a holding portion main body 711 formed in a substantially rectangular plate shape having a rectangular opening 711A in a substantially central portion, and extends upward from an upper edge of the holding portion main body 711. A connecting portion 712 having a substantially rectangular plate shape in plan view that connects the holding portion main body 711 to each urging portion 72 and the insertion portion 73 is provided.
In the holding portion main body 711, three position restricting portions 711B that protrude toward the light beam emission side are formed on the upper and lower edges of the opening 711A.
Then, the viewing angle compensation plate 53 is attached to the end surface of the holder main body 711 on the light emission side with an adhesive or the like with the upper and lower end edges positioned in contact with the position restricting portions 711B (FIG. 9).
In the connecting portion 712, urging receiving portions 712A that protrude to the light beam incident side and that have a tip portion extending parallel to the holding portion 71 (connecting portion 712) are formed on the lower side of the left and right edges. Has been.

As shown in FIG. 9, each urging portion 72 holds the second plate-shaped portion 91 between the holding portion 71 (each urged receiving portion 712 </ b> A), and the second plate-shaped portion 91 is received by each urged receiving portion. Press against part 712A.
Each of these urging portions 72 extends from the upper side of the left and right end edges of the connection portion 712 to the left and right sides in parallel with the connection portion 712, protrudes from the upper end edge to the light beam emission side, and further protrudes in the protruding direction. The 721 has a shape extending to the vicinity of the lower side edge of each urging receiving portion 712 </ b> A with the holding portion 71 inclined. That is, in each urging portion 72, the tip portion 721 presses the upper side of the second plate-shaped portion 91 against each urging receiving portion 712A by its elastic force.

As shown in FIG. 9, the insertion portion 73 is inserted through the upper side of the second plate-like portion 91 and engages with the second plate-like portion 91.
The insertion portion 73 protrudes from the upper edge of the connection portion 712 to the light beam emission side, and has a shape in which the protrusion direction distal end portion 731 hangs parallel to the holding portion 71 (connection portion 712). That is, the tip portion 731 corresponds to the parallel surface portion according to the present invention.
In the insertion portion 73, a pair of insertion protrusions 731 </ b> A are formed on the lower side of the parallel surface portion 731, as shown in FIGS. 7 to 9, protruding to the light beam incident side and inserted through the guide holes 912. The pair of insertion protrusions 731 </ b> A includes burring holes that penetrate the front and back of the insertion part 73.
The guide hole 912 and the insertion protrusion 731A described above correspond to the adjustment structure 11 according to the present invention (FIGS. 9 and 10, hereinafter referred to as a first adjustment structure).
Then, as shown in FIG. 8, the urging portions 72 face each other across the first adjustment structure 11 when viewed from the direction along the optical axis Ax of the light beam applied to the viewing angle compensation plate 53. It is arranged to do.

  Further, in the insertion portion 73, a notch 731B having a U-shape is formed in a substantially central portion of the parallel surface portion 731 as shown in FIG. 7 or FIG. A sliding protrusion 731C is formed on the U-shaped inner portion of the notch 731B, the tip of which protrudes toward the light beam incident side. As shown in FIG. 9, the sliding protrusion portion 731 </ b> C contacts the upper side edge 913 when the upper side of the second plate-like portion 91 is inserted through the insertion portion 73.

With the above structure, the viewing angle compensator 53 is adjusted in posture as described below.
FIG. 10 is a diagram for explaining the posture adjustment of the viewing angle compensation plate 53. In FIG. 10, the viewing angle compensator 53 is not shown for convenience of explanation.
As shown in FIG. 10, with the element holder 7 incorporated in the fixing member 6, for example, the upper side of the insertion portion 73 is gripped by a hand or a jig, and a force is applied in the left-right direction. In the element holding body 7, each bias receiving portion 712 </ b> A comes into contact with the second plate-like portion 91 by the pair of biasing portions 72, and movement in the out-of-plane direction from the second plate-like portion 91 is restricted. The pair of insertion protrusions 731A are guided by the guide holes 912, and rotate about the optical axis Ax of the light beam applied to the viewing angle compensation plate 53. That is, the viewing angle compensation plate 53 rotates around the optical axis Ax together with the element holder 7 to adjust the posture.
At this time, the sliding protrusion 731 </ b> C slides on the upper edge 913 of the second plate-like portion 91. That is, the upper side edge 913 corresponds to the sliding surface according to the present invention, and the sliding protrusion 731C and the sliding surface 913 correspond to the second adjustment structure 12 (FIGS. 9 and 10) according to the present invention. .

The first embodiment described above has the following effects.
In the present embodiment, the element holding body 7 includes a holding portion 71, an urging portion 72, and an insertion portion 73, and the second fixing is performed while the holding portion 71 is pressed against the second fixing portion 9 by the urging portion 72. Supported by part 9. The first adjustment structure 11 is provided in the insertion portion 73 and the second fixing portion 9. In other words, since the first adjustment structure 11 is provided in a portion excluding the urging portion 72, even if a force is applied to the urging portion 72 by applying a force to the element holding body 7, the guide hole It is possible to prevent the insertion protrusion 731 </ b> A from coming off from 912 and maintain the state where the insertion protrusion 731 </ b> A is inserted through the guide hole 912. Therefore, when the element holding body 7 is rotated with respect to the second fixing portion 9, the insertion protrusion 731 </ b> A is well guided along the extending direction of the guide hole 912, and the viewing angle compensation plate 53 is excellent. You can adjust the posture.
In addition, since the projector 1 includes the optical device 5 described above, it is possible to display a good projection image in which the clear vision characteristics of the liquid crystal panel 511 are improved.

  The insertion part 73 has a parallel surface part 731 parallel to the holding part 71, and the parallel surface part 731 is provided with an insertion protrusion part 731 </ b> A. Accordingly, the insertion protrusion 731A is inserted into the guide hole 912 in a state orthogonal to the opening surface of the guide hole 912, and the engagement state of the insertion protrusion 731A with respect to the guide hole 912 is stabilized. be able to.

  Further, since the two urging portions 72 (each urging receiving portion 712A) are arranged so as to sandwich the first adjustment structure 11, the element holding body 7 is rotated with respect to the second fixing portion 9. At this time, the two urging portions 72 stabilize the support state of the element holding body 7 with respect to the second fixing portion 9, and the engagement state in the first adjustment structure 11 (the insertion protrusion portion 731A with respect to the guide hole 912). (Engagement state) can be made stable.

  Further, the second adjustment structure 12 is provided in the insertion portion 73 and the second fixing portion 9. Accordingly, when the element holding body 7 is incorporated in the fixing member 6, the insertion protrusion 731A and the sliding protrusion 731C are in contact with the inner peripheral edge of the guide hole 912 and the sliding surface 913 extending in parallel with each other, respectively. The approximate center position of the viewing angle compensation plate 53 held by the element holder 7 can be made to coincide with the optical axis Ax of the incident light beam, and the viewing angle compensation plate 53 can be easily positioned in the optical device 5. Further, since the portion between the guide hole 912 and the sliding surface 913 is sandwiched between the insertion protrusion 731A and the sliding protrusion 731C, the element holder 7 is rotated with respect to the second fixing portion 9. In addition, it is possible to prevent the position of the element holder 7 from being shifted in the direction orthogonal to the guide hole 912 and the sliding surface 913. That is, it is possible to satisfactorily maintain a state in which the substantially center position of the viewing angle compensation plate 53 is aligned with the optical axis Ax, and to avoid a positional shift of the viewing angle compensation plate 53.

  Further, since the second fixing portion 9 comes into contact with each urging receiving portion 712A formed stepwise on the light beam exit side with respect to the holding portion 71, the viewing angle compensation held by the element holding body 7 (holding portion 71). The plate 53 and the exit-side polarizing plate 54 held by the second fixing portion 9 can be spaced apart. That is, the thermal interference of the optical components 53 and 54 can be suppressed, and the thermal deterioration of the optical components 53 and 54 can be suppressed.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the present embodiment, the formation positions of the urging portion 72 and the insertion portion 73 are set oppositely in the element holder 7 with respect to the first embodiment. In addition, with the change in the shape of the element holder 7, the formation position of the guide hole 912 in the second fixing portion 9 is changed.
Other configurations are the same as those in the first embodiment.

FIG. 11 and FIG. 12 are diagrams showing the configuration of the element holder 7 in the second embodiment. Specifically, FIG. 11 is a perspective view of the element holder 7 viewed from the light beam incident side, and FIG. 12 is a perspective view of the element holder 7 viewed from the light beam exit side.
As shown in FIG. 11 or FIG. 12, the urging portion 72 is provided at a position where the insertion portion 73 is formed in the first embodiment.
More specifically, the urging portion 72 has substantially the same shape as the insertion portion 73 in the first embodiment except that the insertion protrusion portion 731A, the notch 731B, and the sliding protrusion portion 731C are omitted. have. Further, the urging portion 72 has a shape inclined so that a tip portion 721 corresponding to the parallel surface portion 731 in the first embodiment is close to the connecting portion 712. That is, the urging portion 72 has its distal end portion 721 presses the upper side of the second plate-shaped portion 91 against each urging receiving portion 712A by its elastic force, as in the first embodiment.

As shown in FIG. 11 or FIG. 12, the insertion part 73 is provided at the formation position of each urging part 72 in the first embodiment.
More specifically, each insertion portion 73 has substantially the same shape as each urging portion 72 in the first embodiment. Each insertion portion 73 has a shape in which a parallel surface portion 731 corresponding to the tip portion 721 in the first embodiment is parallel to the connection portion 712.
In these insertion portions 73, insertion protrusions 731 </ b> A are formed on the lower side of the parallel surface portion 731, as in the first embodiment.
That is, each insertion portion 73 is inserted through the upper side of the second plate-like portion 91 and engages with the second plate-like portion 91 as in the first embodiment.

FIG. 13 is a perspective view of the second fixing portion 9 in the second embodiment as viewed from the light beam incident side.
As shown in FIG. 13, the second fixing portion 9 is different from the first embodiment only in that two guide holes 912 are provided corresponding to the above-described insertion protrusions 731A.
Each insertion protrusion part 731A and each guide hole 912 described above correspond to the first adjustment structure 11 (see FIG. 14) according to the present invention.
When viewed from the direction along the optical axis Ax of the light beam applied to the viewing angle compensation plate 53, the first adjustment structures 11 sandwich each of the biasing portions 72 (each biasing receiving portion 712A). It arrange | positions so that it may oppose (refer FIG. 14).

FIG. 14 is a perspective view of the state in which the element holder 7 is incorporated in the fixing member 6 as viewed from the light beam incident side.
In the state in which the element holder 7 is incorporated in the fixing member 6, as shown in FIG. 14, in the element holder 7, each biasing receiving portion 712 </ b> A abuts on the second plate-like portion 91 by the biasing portion 72. The out-of-plane movement from the two plate-like portions 91 is restricted. Then, for example, by gripping the upper side of the urging portion 72 with a hand or a jig and applying a force in the left-right direction, each insertion projection portion 731A is guided by each guide hole 912, which is the same as in the first embodiment. To turn.

The second embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In the present embodiment, since the two first adjustment structures 11 are disposed so as to sandwich the urging portion 72 (each urging receiving portion 712 </ b> A), the element holding body 7 is attached to the second fixing portion 9. When rotating, the element holding body 7 is supported with respect to the second fixing portion 9 by one urging portion 72 that is required at a minimum, and the second fixing portion 9 is supported by the two first adjustment structures 11. The engagement state of the element holding body 7 (the engagement state of each insertion protrusion 731A with respect to each guide hole 912) can be made stable.

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 each of the above embodiments, the viewing angle compensator 53 is employed as the optical element according to the present invention. However, the present invention is not limited to this, and any optical element can be used as long as it is disposed on the light emission side of the liquid crystal panel 511. May be adopted. For example, the exit side polarizing plate 54 and the retardation plate may be employed as the optical element according to the present invention.

In each of the embodiments, the insertion protrusion 731A is provided in the insertion part 73. However, the present invention is not limited to this, and the insertion protrusion may be located at any position as long as it is a portion excluding the biasing part 72 in the element holding body 7. 731A may be provided. For example, the insertion protrusion 731A may be provided in the holding part 71.
Similarly, in the first embodiment, the sliding protrusion portion 731C is provided in the insertion portion 73. However, the sliding protrusion portion 731C is not limited to this, and any portion can be used as long as it is a portion excluding the biasing portion 72 in the element holding body 7. A sliding protrusion 731C may be provided at the position. For example, the holding protrusion 71 may be provided with a sliding protrusion 731C.

In each of the above embodiments, the guide hole 912 is provided in the second fixing portion 9 and the insertion protrusion 731A is provided in the element holding body 7. However, the present invention is not limited thereto, and the guide hole 912 is provided in the element holding body 7. The insertion protrusion 731A may be provided on the second fixing portion 9.
Similarly, in the first embodiment, the sliding surface 913 is provided on the second fixed portion 9 and the sliding protrusion 731C is provided on the element holding body 7. However, the present invention is not limited thereto, and the sliding surface 913 is not limited thereto. May be provided on the element holder 7, and the sliding protrusion 731 </ b> C may be provided on the second fixing portion 9.
In the second embodiment, the second adjustment structure 12 is omitted. However, the present invention is not limited to this, and the second adjustment structure 12 may be provided as in the first embodiment.
Further, in each of the embodiments, the adjustment structures 11 and 12 are provided on the upper side of the element holding body 7 and the second fixing portion 9, but not limited thereto, the lower side, the left side, or the right side. It may be provided at any position.

In each embodiment described above, the configuration of the projector 1 is not limited to the configuration described in each embodiment.
For example, the light source device 31 is configured as a discharge light-emitting type light source device, but is not limited thereto, and various solids such as a laser diode, an LED (Light Emitting Diode), an organic EL (Electro Luminescence) element, and a silicon light-emitting element. A light emitting element may be adopted.
Further, although only one light source device 31 is used and the color separation optical device 33 separates it into three color lights, the color separation optical device 33 is omitted, and the three solid-state light emitting elements that emit three color lights respectively. You may comprise as a light source device.
Further, the projector 1 is configured as a three-plate projector including three liquid crystal panels 511, but is not limited thereto, and is configured as a projector including two liquid crystal panels or a projector including four or more liquid crystal panels. It doesn't matter.
Further, although the transmissive liquid crystal panel 511 is employed as the light modulation device according to the present invention, the present invention is not limited thereto, and a reflective liquid crystal panel may be employed.
Furthermore, although only an example of a front projection type projector has been described, the present invention is also applicable to a rear type projector that includes a screen and performs projection from the back side of the screen.

  Since the optical device of the present invention can adjust the posture of an optical element such as a viewing angle compensator satisfactorily, it can be used for an optical device of a projector used for presentations, home theaters, and the like.

FIG. 3 is a diagram illustrating a schematic configuration of a projector according to the first embodiment. The figure which shows the structure of the optical apparatus main body in the said embodiment. The figure which shows the structure of the optical apparatus main body in the said embodiment. The perspective view which shows the structure of the 2nd fixing | fixed part in the said embodiment. The perspective view which shows the structure of the 2nd fixing | fixed part in the said embodiment. The figure which shows the structure of the element holding body in the said embodiment. The figure which shows the structure of the element holding body in the said embodiment. The figure which shows the structure of the element holding body in the said embodiment. The figure which shows the state which incorporated the element holding body in the said embodiment in the fixing member. The figure for demonstrating the attitude | position adjustment of the viewing angle compensation board in the said embodiment. The figure which shows the structure of the element holding body in 2nd Embodiment. The figure which shows the structure of the element holding body in the said embodiment. The perspective view which looked at the 2nd fixing | fixed part in the said embodiment from the light beam entrance side. The perspective view which looked at the state which incorporated the element holding body in the said embodiment in the fixing member from the light beam entrance side.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 4 ... Projection lens (projection optical apparatus), 5 ... Optical apparatus, 6 ... Fixing member, 7 ... Element holding body, 11 ... Adjustment structure, 12 ... Second adjustment structure 31 ... light source device 51 ... light modulation device 53 ... viewing angle compensator (optical element) 55 ... color synthesis optical device 55A ... incident light beam Side end surface, 71 ... holding part, 72 ... biasing part, 73 ... insertion part, 731 ... parallel surface part, 731A ... insertion protrusion part, 731C ... sliding protrusion part, 912 ... Guide hole, 913 ... Sliding surface.

Claims (6)

A plurality of light modulation devices that modulate a plurality of color lights according to image information for each color light, and a plurality of light beam incident side end faces facing the light modulation devices, and the color lights modulated by the light modulation devices. An optical device comprising a color combining optical device for combining and forming image light,
An optical element disposed on a light beam exit side of the light modulation device; an element holding body that is interposed between the light modulation device and the light beam incident side end surface; and the light modulation device and the element A fixing member that supports the holding body and fixes the light flux incident side end surface;
The element holder is
While holding the optical element, a plate-like holding portion disposed to face the fixing member,
An urging portion that is connected to an outer edge of the holding portion, holds the fixing member with the holding portion, and urges the fixing member toward the holding portion;
In the part excluding the urging portion in the element holder, and the fixing member,
A guide hole extending in an arc shape around the optical axis of the light beam incident on the optical element, and an insertion protrusion inserted into the guide hole, and the insertion protrusion guides along the extending direction of the guide hole. Accordingly, an adjustment structure for adjusting the posture of the element holding body with respect to the fixing member is provided. The optical device according to claim 1.
The element holder is
It has a parallel surface portion that is connected to the outer edge of the holding portion and is parallel to the holding portion, and includes an insertion portion through which the fixing member is inserted between the parallel surface portion and the holding portion,
The optical device, wherein the parallel surface portion is provided with the guide hole or the insertion protrusion. The optical device according to claim 1 or 2,
The urging unit is provided at a position facing each other across the adjustment structure when viewed from the direction along the optical axis. The optical device according to claim 1 or 2,
The optical device is characterized in that the adjustment structures are provided at positions facing each other across the urging portion when viewed from the direction along the optical axis. The optical device according to any one of claims 1 to 4,
In the part excluding the urging portion in the element holder, and the fixing member,
An optical apparatus, comprising: a second adjustment structure including a sliding surface extending in parallel with the guide hole and a sliding protrusion that slides along the sliding surface.   A projector comprising: a light source device; the optical device according to any one of claims 1 to 5; and a projection optical device that enlarges and projects image light formed by the optical device.

Images