JP2009210768A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which is arranged on a predetermined position on an optical axis even when an electro-optical device is detached. <P>SOLUTION: The projector 1 includes: an electro-optical device 252; a projection lens; an optical component housing 4 in which the optical axis for a luminous flux is set and the electro-optical device 252 and projection lens are disposed on the predetermined positions on the optical axis; and a mounting part 5 holding the electro-optical device 252 and mounting the electro-optical device 252 on the optical component housing 4. The optical component housing 4 has positioning bosses 42B and 45B for positioning the electro-optical device 252 to the optical axis. The mounting part 5 has notches 521 and 551 which are engaged with the positioning bosses 42B and 45B. The mounting part 5 is provided with pressing parts 522 and 552, which press the electro-optical device 252 to the optical component housing 4 in a predetermined direction when the electro-optical device 252 is disposed on the optical component housing 4, so that the positioning bosses 42B and 45B are engaged with the notches 521 and 551. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector that projects image light.

A projector is an optical device that modulates a light beam from a light source according to image information by an electro-optical device to form image light, and projects the image light on a screen or the like by a projection optical device. It is used for various purposes such as watching movies at home.
An electro-optical device including a plurality of liquid crystal panels that respectively modulate a plurality of color lights according to image information and a color combining optical device (cross dichroic prism) that combines the modulated color lights. A projector including an optical component casing in which an optical device is disposed on an optical axis is known (see, for example, Patent Document 1).

  In the electro-optical device disclosed in Patent Document 1, a liquid crystal panel is fixed to the three light beam incident side end faces of the color synthesis optical device via a holding frame, and an attachment member is attached to the upper surface of the color synthesis optical device. This mounting member includes four arm portions, and each of these arm portions is formed with a round hole. On the other hand, the optical component casing (light guide) is provided with two positioning projections and two screw holes corresponding to the round holes of the mounting member. The positioning projections are inserted into the two round holes, whereby the electro-optical device is positioned in the optical component casing, and the screws are inserted into the remaining two round holes. The electro-optical device is fixed to the optical component casing by being screwed into the hole.

JP 2002-287253 A

  However, in the technique described in Patent Document 1, a slight gap is formed between the protrusion and the round hole in order to insert the protrusion for positioning the optical component housing into the round hole of the mounting member. ing. Due to this gap, the attachment member, that is, the electro-optical device, may be displaced when attached to the optical component casing, and may be displaced or inclined with respect to the optical axis. For example, in an after-sales service or the like, when the electro-optical device is removed for replacement or cleaning of the electro-optical device and attached to the optical component casing again, the position of the electro-optical device may be shifted before and after attachment / detachment. Since this positional shift is a positional shift with respect to the projection optical apparatus, there is a possibility that the projected image may cause a focus shift or a display shadow.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes an electro-optical device that modulates a light beam emitted from a light source according to image information to form image light, a projection optical device that projects the image light, an internal The optical axis of the light beam is set, and the optical component casing in which the electro-optical device and the projection optical device are arranged at predetermined positions on the optical axis. The body includes a positioning portion for positioning the electro-optical device with respect to the optical axis, and includes a mounting portion that holds the electro-optical device and attaches the electro-optical device to the optical component casing. The engaging portion engages with the positioning portion, and when the electro-optical device is disposed in the optical component casing, either the attachment portion or the optical component casing is provided. And the electro-optical device. The biased in a predetermined direction relative to the optical component casing, wherein the biasing unit with engaging with the engaging portion and the positioning portion is provided.

  According to this configuration, when the electro-optical device is held by the mounting portion and disposed in the optical component casing, the electro-optical device is biased in a predetermined direction by the biasing portion with respect to the optical component casing. And the engaging part of an attaching part engages with the positioning part of the housing | casing for optical components. The positioning unit is for positioning the electro-optical device with respect to the optical axis, and the engaging unit is in contact with the positioning unit without a gap, so the electro-optical device is accurately arranged at a predetermined position on the optical axis. Is done. As a result, even if the electro-optical device is attached or detached at the time of after-sales service or the like, the electro-optical device is urged again by the urging unit and is arranged in the optical component casing with high accuracy. In addition, since the electro-optical device is accurately arranged with respect to the projection optical device arranged at a predetermined position on the optical axis, the projector suppresses focus shift and display shadow by the projection optical device. Thus, image light can be projected.

  Application Example 2 In the projector according to the application example described above, a pair of the positioning unit, the engagement unit, and the urging unit is provided, and one of the positioning unit and the engagement unit is one of the urging units. The electro-optical device is engaged so as to be urged in the optical axis direction, and the other positioning portion and the engaging portion are connected to the optical axis by the other urging portion. It is preferable to engage so as to be urged toward a vertical plane passing through.

According to this configuration, the one positioning portion and the engaging portion are engaged by the one urging portion so that the electro-optical device is urged in the optical axis direction. Accordingly, the electro-optical device can be positioned in the optical axis direction and disposed at an appropriate position on the optical axis. Further, the other positioning portion and the engaging portion are engaged so that the electro-optical device is urged toward the vertical plane passing through the optical axis by the other urging portion. Accordingly, the electro-optical device can be positioned at an appropriate position on the optical axis by positioning the angle with respect to the vertical plane passing through the optical axis, that is, the angle with respect to the optical axis.
As described above, the electro-optical device is positioned with respect to the optical axis direction and positioned with respect to the optical axis by the pair of positioning portions, the engaging portion, and the urging portion. It becomes possible to arrange | position to a housing | casing.

  Application Example 3 In the projector according to the application example described above, the optical component casing is provided with a pair of screw holes for mounting the electro-optical device, and the mounting portion is the electro-optical device in a plan view. It has a pair of arm portions that protrude more and are substantially diagonal, and in the vicinity of the ends of the pair of arm portions, is adjacent to the engagement portion and the engagement portion, and is screwed into the screw hole. It is preferable that a hole through which the screw is inserted is provided.

  According to this configuration, the pair of engaging portions is provided in the vicinity of the distal ends of the pair of arm portions protruding from the electro-optical device in plan view. Accordingly, since the electro-optical device is positioned over a long distance, the electro-optical device can be arranged with higher accuracy than the case where the electro-optical device is positioned over a short distance. In addition, the attachment portion is attached to the optical component casing near the engagement portion with a screw. As a result, the engaging portion can be reliably held at a predetermined position even when the biasing portion biases the electro-optical device, so that the electro-optical device can be arranged with higher accuracy. It becomes possible.

  Application Example 4 In the projector according to the application example described above, the engagement portion is configured such that a force in a rotation direction when a screw is screwed into the screw hole is applied to the positioning portion from the engagement portion. It is preferable that it is located so that it may be transmitted to a part.

  According to this configuration, the engaging portion is positioned such that the force in the rotation direction when the screw is screwed into the screw hole is transmitted from the engaging portion to the positioning portion with respect to the positioning portion. Thereby, when the electro-optical device is attached to the optical component casing, the force for separating the engaging portion and the positioning portion is suppressed, so that the positioning portion and the engaging portion are kept in contact with each other. The electro-optical device can be attached to the optical component casing with high accuracy.

  Application Example 5 In the projector according to the application example described above, it is preferable that the urging portion is integrally formed with either the attachment portion or the optical component casing.

  According to this configuration, since the urging portion is integrally formed with either the mounting portion or the optical component casing, the urging portion is more accurately compared to the case where the urging portion is configured separately. Can be configured. Accordingly, it is possible to stably secure a force for urging the electro-optical device with respect to the optical component casing.

Hereinafter, the projector according to the present embodiment will be described with reference to the drawings.
The projector according to the present embodiment modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects this image light on a screen or the like.
FIG. 1 is a plan view schematically showing a schematic configuration of the projector.
As shown in FIG. 1, a projector 1 includes a substantially L-shaped optical unit 2, an exterior casing 3 that houses an apparatus main body and constitutes an exterior, a cooling fan that cools the interior of the exterior casing 3, and various types of processing on image information And a power supply unit (not shown) for supplying power to the control unit and the like.

  The optical unit 2 is a unit that forms and projects image light corresponding to image information by optically processing the light beam emitted from the light source 211 under the control of the control unit. The optical unit 2 includes a light source device 21, an illumination optical device 22, a color separation optical device 23, a relay optical device 24, an optical device 25, a projection lens 26 as a projection optical device, and these optical components 21 to 26 at predetermined positions. And an optical component casing 4.

  The light source device 21 includes a light source 211, a reflector 212, and the like. Then, the light source device 21 aligns the emission direction of the light beam emitted from the light source 211 with the reflector 212 and emits it toward the illumination optical device 22. Here, the optical axis of the light beam emitted from the light source device 21 is referred to as an optical axis L.

  The illumination optical device 22 includes a first lens array 221, a second lens array 222, a polarization conversion element 223, and a superimposing lens 224. The first lens array 221 has a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis L direction are arranged in a matrix, and the light beam emitted from the light source device 21 is converted into a plurality of partial light beams. To divide. The second lens array 222 has substantially the same configuration as the first lens array 221, and together with the superimposing lens 224, the partial light beam is substantially superimposed on the surface of a liquid crystal panel 253 described later. The polarization conversion element 223 has a function of aligning randomly polarized light emitted from the second lens array 222 with substantially one type of polarized light that can be used by the liquid crystal panel 253.

The color separation optical device 23 includes two dichroic mirrors 231 and 232 and a reflection mirror 233, and the light emitted from the illumination optical device 22 is converted into red light (hereinafter referred to as “R light”) and green light (hereinafter referred to as “G light”). Light) and blue light (hereinafter referred to as “B light”).
The first dichroic mirror 231 reflects R light and transmits G light and B light. The R light reflected by the first dichroic mirror 231 is reflected by the reflection mirror 233 and enters the liquid crystal panel 253R for R light. The second dichroic mirror 232 reflects G light and transmits B light. The G light out of the G light and B light transmitted through the first dichroic mirror 231 is reflected by the second dichroic mirror 232 and enters the liquid crystal panel 253G for G light. On the other hand, the B light passes through the second dichroic mirror 232 and enters the relay optical device 24.

The relay optical device 24 includes an incident side lens 241, a relay lens 243, and reflection mirrors 242, 244, and has a function of guiding the B light separated by the color separation optical device 23 to the liquid crystal panel 253B for B light.
The B light emitted from the color separation optical device 23 is converged in the vicinity of the relay lens 243 by the incident side lens 241 and is diverged toward the reflection mirror 244. The size of the light beam incident on the reflection mirror 244 is set to be approximately equal to the size of the light beam incident on the incident side lens 241. As described above, the reason why the relay optical device 24 is used for the B light is that the optical path length of the B light is longer than the optical path lengths of the other color lights. It is for preventing.
Here, the optical axes of the color lights incident on the liquid crystal panels 253R, 253G, and 253B are referred to as optical axes LR, LG, and LB, respectively. The optical unit 2 has a configuration in which the relay optical device 24 guides the B light. However, the configuration is not limited thereto, and for example, the optical unit 2 may have a configuration that guides the R light.

The optical device 25 includes an incident-side polarizing plate 251 and an electro-optical device 252, and modulates each incident color light according to image information to form image light.
The incident-side polarizing plate 251 is provided for each color light, and is configured by attaching a polarizing film on a translucent substrate. The incident-side polarizing plate 251 transmits the polarized light aligned by the polarization conversion element 223 among the respective color lights separated by the color separation optical device 23, and absorbs the polarized light different from the polarized light to perform electro-optics. Inject into device 252.

The electro-optical device 252 includes three liquid crystal panels 253 as light modulators (the liquid crystal panel for R light is 253R, the liquid crystal panel for G light is 253G, and the liquid crystal panel for B light is 253B), and each liquid crystal panel 253 includes an exit-side polarizing plate 254 disposed on the downstream side of the optical path 253 and a cross dichroic prism 255 as a color synthesizing optical device.
The liquid crystal panel 253 has a configuration in which liquid crystal, which is an electro-optical material, is hermetically sealed between a pair of transparent glass substrates, and the alignment state of the liquid crystal is controlled according to the drive signal from the control unit. The color light emitted from 251 is modulated.
The exit-side polarizing plate 254 has substantially the same function as the incident-side polarizing plate 251 and transmits polarized light in a certain direction among the light beams emitted from the liquid crystal panel 253 and absorbs other light beams.

The cross dichroic prism 255 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. Then, the cross dichroic prism 255 takes in each color light emitted from the emission side polarizing plate 254 from the light beam incident side end face to form image light and emits it from the light emission side end face.
Further, a mounting portion for holding the electro-optical device 252 is mounted on the upper surface of the cross dichroic prism 255. The details of the attachment portion will be described later.

  The projection lens 26 is configured as a combined lens in which a plurality of lenses are combined, and enlarges and projects the image light formed by the electro-optical device 252 on the screen.

The optical component casing 4 has optical axes L, LR, LG, and LB of the light beam set therein, and the optical components 21 to 26 described above are placed at predetermined positions on the optical axes L, LR, LG, and LB. Deploy.
2 and 3 are perspective views of the optical component casing 4. Specifically, FIG. 2 is a view of the optical component casing 4 as viewed from the front upper side, and shows a state where the electro-optical device 252 is separated and the projection lens 26 is attached. FIG. 3 is a view of the optical component housing 4 as viewed from the upper rear side, and shows a state where the electro-optical device 252 is separated. In the following, in the drawing view of FIG. 2, the right is described as “right” (+ X direction), the upper is described as “up” (+ Z direction), and the front is described as “front” (+ Y direction).

  As shown in FIGS. 2 and 3, the optical component casing 4 is formed in a box shape having an opening formed upward (+ Z direction). And the opening part 46 is formed in the left-right direction in the left side (-X side) edge part. And the light source device 21 (refer FIG. 1) is arrange | positioned in the left end part, and a light beam is inject | emitted from the opening part 46 toward the inside. A plurality of grooves are provided on the inner wall surface of the optical component casing 4, and each optical component is disposed with a side end inserted into the groove. A side wall 41 having an opening in the front-rear direction (± Y direction) is provided on the front right side wall. The projection lens 26 is mounted on the side wall 41 by screws on the optical axes L, LR, LG, and LB. It can be attached to a predetermined position with high accuracy.

As shown in FIG. 3, four protrusions 42, 43, 44, and 45 for attaching the electro-optical device 252 through the attachment portion are formed behind the side wall 41 (−Y direction).
The protrusions 42 and 43 are formed on the inner surface of the side wall 41 on the right side and the left side which are substantially symmetric with respect to the vertical plane FG passing through the optical axis LG. The protrusions 44 and 45 are formed at positions substantially symmetrical to the protrusions 42 and 43, respectively, with respect to the vertical plane FB passing through the optical axis LB.
Further, columnar positioning bosses 42B and 45B are provided on the upper surfaces of the protrusions 42 and 45, respectively. The positioning bosses 42B and 45B have a function as a positioning unit for positioning the electro-optical device 252 with respect to the optical axes LG, LB, and LR. The protrusions 42 and 45 are provided with screw holes 42A and 45A corresponding to right screws, respectively, adjacent to the positioning bosses 42B and 45B.

Here, the configurations of the electro-optical device 252 and the mounting portion 5 will be described.
As shown in FIGS. 2 and 3, the electro-optical device 252 includes a liquid crystal panel 253 and an exit-side polarizing plate 254 (see FIG. 1) on each of the three light flux incident side end faces of the cross dichroic prism 255 for each color light. It is a structure fixed via. The attachment portion 5 is attached to the upper surface of the cross dichroic prism 255 via an adhesive.

FIG. 4 is a plan view of the attachment portion 5 attached to the cross dichroic prism 255 as viewed from above.
4, the liquid crystal panels 253R, 253G, and 253B are arranged to face the light beam incident side end surfaces of the left side, the upper side, and the right side of the cross dichroic prism 255, respectively. The liquid crystal panel 253R is mounted so that the center line PR substantially orthogonal to the liquid crystal panel 253R substantially coincides with the optical axis LR when the electro-optical device 252 is disposed at a predetermined position of the optical component housing 4. It has been. Similarly, the liquid crystal panels 253G and 253B are mounted so that the center lines PG and PB substantially coincide with the optical axes LG and LB when the electro-optical device 252 is disposed at a predetermined position of the optical component casing 4, respectively. It has been.
Although omitted in FIG. 4, the exit-side polarizing plate 254 is fixed between each light beam incident-side end surface of the cross dichroic prism 255 and the liquid crystal panels 253R, 253G, and 253B.

The mounting portion 5 is made of synthetic resin, and as shown in FIG. 4, a prismatic base portion 51 having a plane substantially the same size as the upper surface of the cross dichroic prism 255, and an outer side from the corner portion of the base portion 51. And four arm portions 52, 53, 54, 55 projecting toward the bottom.
The arm portion 52 protrudes from a corner portion between the light beam emission side end face 255S and the liquid crystal panel 253B in the drawing view of FIG. The arm portion 53 protrudes from a corner portion between the light beam emission side end face 255S and the liquid crystal panel 253R in the drawing view of FIG. The arm portions 54 and 55 are formed at positions that are substantially diagonal to the arm portions 53 and 52, respectively.

  A round hole 52A is formed in the arm portion 52 near the tip. In addition, the side surface of the arm portion 52 adjacent to the round hole 52A on the light beam emission side end surface 255S side is substantially orthogonal to the plane 521G substantially orthogonal to the center line PG and the center line PB (center line PR). An L-shaped notch 521 having a flat surface 521BR is formed. The notch 521 is provided at a position corresponding to the positioning boss 42B (see FIG. 3) of the optical component housing 4, and functions as an engaging portion in which the plane 521G and the plane 521BR come into contact with and engage with the positioning boss 42B. have. Specifically, the flat surface 521G is set so as to position the electro-optical device 252 in the optical axis LG direction (centerline PG direction) when contacting the positioning boss 42B. Further, the flat surface 521BR is set so as to position the electro-optical device 252 in the optical axis LB direction (centerline PB direction) when contacting the positioning boss 42B.

Further, the arm portion 52 is formed with a rectangular parallelepiped urging portion 522 that faces the notch 521 with a gap 52K and extends outward with the base 51 side as a base end.
The urging portion 522 has a function as a spring by bending with the base end as a fulcrum, and bends when a member that widens the gap 52K is inserted, and urges the notch 521 side toward the urging portion 522. A force (biasing force) to be generated is generated. Specifically, a dimension larger than the diameter dimension of a circle 52C (indicated by a two-dot chain line in FIG. 4) formed so as to be in contact with three surfaces of the urging portion 522 on the side of the notch 521, the plane 521G, and the plane 521BR. When the member is inserted, the urging portion 522 is bent to generate an urging force.
The urging portion 522 is set so that the diameter of the circular 52C is smaller than the outer dimension of the positioning boss 42B.

A round hole 55 </ b> A is formed in the vicinity of the tip of the arm portion 55. Further, a U-shaped notch 551 having an inclined surface 551S inclined with respect to the vertical plane FPG passing through the center line PG is formed on the side surface of the arm portion 55 adjacent to the round hole 55A on the liquid crystal panel 253G side. . The notch 551 is provided at a position corresponding to the positioning boss 45B (see FIG. 3) of the optical component housing 4, and has a function as an engaging portion in which the inclined surface 551S contacts and engages the positioning boss 45B. ing. Specifically, the inclined surface 551S is set so as to position the electro-optical device 252 at an angle with respect to the vertical plane FG, that is, the optical axis LG and the optical axis LB (optical axis LR), when contacting the positioning boss 45B. ing.
When the notch 551 is engaged with the positioning bosses 45B and 42B together with the above-described notch 521, the optical axis LG, the center line PG, the optical axis LB (optical axis LR), and the center line PB (center) Line PR) is set so as to substantially match each other.

Further, the arm portion 55 is formed with a rectangular parallelepiped urging portion 552 that faces the notch 551 with a gap 55K and extends outward with the base 51 side as a base end.
Like the urging portion 522, the urging portion 552 functions as a spring by bending with the base end as a fulcrum. Then, a member having a size larger than the diameter of a circular 55C (indicated by a two-dot chain line in FIG. 4) formed so as to be in contact with the surface on the notch 551 side of the urging portion 552 and the two surfaces of the inclined surface 551S is inserted. Then, a force (biasing force) for biasing the notch 551 side toward the biasing portion 552 is generated in the biasing portion 522.
The urging portion 552 is set so that the diameter of the circular 55C is smaller than the outer dimension of the positioning boss 45B.

FIG. 5 is a perspective view of the mounting portion 5 as viewed from below.
As shown in FIG. 5, a boss 53 </ b> A protruding in a columnar shape is formed in the vicinity of the tip of the arm portion 53. The boss 53A is provided at a position corresponding to the round hole 43A (see FIG. 2) of the optical component casing 4, and its outer diameter is set smaller than the inner diameter of the round hole 43A.
In the vicinity of the tip of the arm portion 54, a boss 54A protruding in a columnar shape is formed. The boss 54A is provided at a position corresponding to the round hole 44A (see FIG. 2) of the optical component casing 4, and its outer diameter is set smaller than the inner diameter of the round hole 44A.
The bottom surface 51A of the base 51 is formed flat, and the attachment portion 5 is attached to the top of the cross dichroic prism 255 by fixing the bottom surface 51A and the top surface of the cross dichroic prism 255 with an adhesive. It is done.

Next, an attachment structure in which the electro-optical device 252 is attached to the optical component casing 4 via the attachment portion 5 will be described.
Returning to FIG. 3, the electro-optical device 252 is incorporated from the opening above the optical component housing 4 with the liquid crystal panel 253 </ b> G facing backward (−Y direction). Specifically, the electro-optical device 252 is disposed in the optical component housing 4 with the positioning boss 42B inserted through the gap 52K of the mounting portion 5 and the positioning boss 45B inserted through the gap 55K.

FIG. 6 is a plan view showing a state where the electro-optical device 252 is arranged in the optical component casing 4.
As shown in FIG. 6, when the positioning boss 42B is inserted into the gap 52K, the urging portion 522 is bent so that the gap 52K is widened, and an urging force is generated. The electro-optical device 252 is urged toward the urging portion 522 by the urging force, the notch 521 and the positioning boss 42B are engaged, and the plane 521G and the plane 521BR are in contact with the positioning boss 42B.
On the other hand, when the positioning boss 45B is inserted into the gap 55K, the urging portion 552 is bent so that the gap 55K is widened, and an urging force is generated. The electro-optical device 252 is urged toward the urging portion 552 by the urging force, the notch 551 and the positioning boss 45B are engaged, and the inclined surface 551S and the positioning boss 42B abut.
As a result, the electro-optical device 252 is disposed at appropriate positions in the optical axis LG direction and the optical axis LB direction (optical axis LR direction), and the angle with respect to the optical axis LG and the optical axis LB (optical axis LR) is appropriate. And positioned at predetermined positions on the optical axis LG and the optical axis LB (optical axis LR).

  As described above, the positioning boss 42B and the notch 521 are engaged by the biasing portion 522 so that the electro-optical device 252 is biased in the optical axis LG direction and the optical axis LB direction (optical axis LR direction). Then, the positioning boss 45B and the notch 551 are engaged by the biasing portion 552 so that the electro-optical device 252 is biased toward the vertical plane FG, that is, the optical axis LG. As a result, the electro-optical device 252 is disposed at predetermined positions at which the optical axis LG and the center line PG, and the optical axis LB (optical axis LR) and the center line PB (center line PR) substantially coincide with each other.

After the electro-optical device 252 is arranged in the optical component casing 4, as shown in FIG. 3, the screw SC in which a right screw is formed in the round hole 52A and the round hole 55A is inserted, and the screw holes 42A, Screws SC are respectively screwed into 45A and fixed to the optical component casing 4.
When the screw SC is screwed into the screw holes 42A and 45A, a force in the direction of rotating the screw is applied to the mounting portion 5. Specifically, as shown in FIG. 6, since the right screw is formed on the screw SC, when the screw SC is screwed into the screw hole 42A, the attachment portion 5 is rotated about the center of the screw hole 42A. A force in the clockwise direction (arrow 55R in FIG. 6) is applied as the center. The notch 551 is positioned upstream of the positioning boss 45B in the rotational direction, that is, the force in the rotational direction is transmitted from the notch 551 to the positioning boss 45B. Thereby, even when the screw SC is screwed into the screw hole 42A, the state where the positioning boss 45B and the notch 551 are in contact with each other is maintained.
Similarly, when the screw SC is screwed into the screw hole 45A, a force in the clockwise direction (arrow 52R in FIG. 6) is applied to the mounting portion 5 with the center of the screw hole 45A as the rotation center. Since the notch 521 is positioned so that this rotational force is transmitted from the notch 521 to the positioning boss 42B, the state where the positioning boss 42B and the notch 521 are in contact with each other is maintained.
As described above, the electro-optical device 252 is held at a predetermined position of the optical component housing 4 even when the electro-optical device 252 is screwed to the optical component housing 4.

  In addition, when the electro-optical device 252 is disposed in the optical component housing 4, the bosses 53 </ b> A and 54 </ b> A are inserted into the mounting portion 5 with gaps from the round holes 43 </ b> A and 44 </ b> A. The bosses 53A and 54A and the round holes 43A and 44A come into contact with the boss 53A, the round hole 43A, and the boss 54A and the round hole 44A, respectively, when an impact is applied to the electro-optical device 252 due to dropping of the projector 1 or the like. It functions so that the impact force applied to the mounting portion 5 is dispersed and the mounting portion 5 is not damaged.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained.
(1) According to the projector 1 of the present embodiment, the electro-optical device 252 is held by the mounting portion 5 and is disposed on the optical component casing 4 by the biasing portions 522 and 552. The body 4 is urged in a predetermined direction. The electro-optical device 252 is accurately arranged at predetermined positions on the optical axes LR, LG, and LB. As a result, even if the electro-optical device 252 is attached or detached at the time of after-sales service or the like, the electro-optical device 252 is again urged by the urging portions 522 and 552 and is accurately arranged in the optical component casing 4. In addition, since the electro-optical device 252 is accurately arranged with respect to the projection lens 26 attached to the optical component casing 4, the projector 1 causes the projection lens 26 to cause a focus shift or display shadow. It is possible to project image light with suppression.

  (2) According to the projector 1 of this embodiment, the electro-optical device 252 includes the positioning bosses 42B and 45B, the notches 521 and 551, and the urging portions 522 and 552 provided in a pair, and the optical axis LG direction and light. Positioning in the direction of the axis LB (optical axis LR) and positioning of the angle with respect to the optical axis LG and the optical axis LB (optical axis LR) are performed, so that the accuracy is improved and the optical component housing 4 is disposed. Is possible.

  (3) According to the projector 1 of the present embodiment, the notches 521 and 551 are provided in the vicinity of the ends of the pair of arms protruding from the electro-optical device 252 in plan view. Accordingly, since the electro-optical device 252 is positioned over a long distance, the electro-optical device 252 can be arranged with higher accuracy than the case where the electro-optical device 252 is positioned over a short distance. In addition, the attachment portion 5 is attached to the optical component casing 4 near the notches 521 and 551 by screws SC. Accordingly, the notches 521 and 551 can be reliably held at predetermined positions even when the biasing portions 522 and 552 bias the electro-optical device 252 with a large force. The optical device 252 can be disposed.

  (4) According to the projector 1 of the present embodiment, the notches 521 and 551 have a rotational force when the screw SC is screwed into the screw holes 42A and 45A with respect to the positioning bosses 42B and 45B. They are positioned so as to be transmitted from the notches 521 and 551 to the positioning bosses 42B and 45B, respectively. Accordingly, when the electro-optical device 252 is attached to the optical component casing 4, the force that separates the notches 521 and 551 and the positioning bosses 42 </ b> B and 45 </ b> B is suppressed. The state where 521 and 551 are in contact with each other is maintained, and the electro-optical device 252 is attached to the optical component casing 4 with high accuracy.

(5) According to the projector 1 of the present embodiment, the urging portions 522 and 552 are formed integrally with the mounting portion 5, so that they can be formed with higher accuracy than in the case where they are configured separately. Can do. Accordingly, it is possible to stably secure a force for urging the electro-optical device 252 against the optical component housing 4.
In addition, the number of parts can be reduced as compared with the case where the separate member is configured, and a space for attaching the separate member is not necessary, so that cost and space can be reduced.

  (6) According to the projector 1 of the present embodiment, since it is possible to suppress a focus shift, the depth of focus standard of the projection lens 26 can be relaxed. Thereby, it is possible to reduce the cost of the projection lens 26 by relaxing the optical standard of each lens constituting the projection lens 26.

(Modification)
In addition, you may change the said embodiment as follows.
In the above-described embodiment, the urging portions 522 and 552 are provided in the attachment portion 5, but may be provided in the optical component casing 4. Further, the urging portions 522 and 552 may be composed of another member, for example, a metal plate material.

  In the above-described embodiment, the two urging units 522 and 552 are used.

  In the above embodiment, the convex positioning bosses 42B and 45B are used as the positioning part of the optical component casing 4, and the concave notches 521 and 551 are used as the engaging parts of the mounting part 5. You may comprise by this positioning part and a convex-shaped engaging part.

In the above-described embodiment, the mounting portion 5 is configured to be mounted above the electro-optical device 252, but may be configured to be fixed to the lower side.
In addition, a screw hole is formed in the mounting portion 5, a hole through which the screw SC is inserted is formed in the optical component housing 4, and the screw SC is screwed from the optical component housing 4 to the mounting portion 5. You may comprise so that 252 may be attached to the housing | casing 4 for optical components.

  The incident side polarizing plate 251 may be configured to be attached to the electro-optical device 252.

  The projector 1 according to the embodiment uses the transmissive liquid crystal panel 253 as the light modulator, but may use a reflective liquid crystal panel. The light modulation device employs a so-called three-plate method using three liquid crystal panels 253 corresponding to R light, G light, and B light. However, the present invention is not limited to this, and a liquid crystal panel for improving contrast is used. 253 may be added.

  Although the projector 1 of the embodiment is applied as a front type projector, it can also be applied to a rear type projector integrally having a screen as a projection target surface.

FIG. 2 is a plan view schematically showing a schematic configuration of a projector. The perspective view which looked at the housing | casing for optical components from the front upper side. The perspective view which looked at the housing | casing for optical components from the back upper side. The top view which looked at the attaching part from the upper part. The perspective view which looked at the attaching part from the lower part. FIG. 3 is a plan view showing a state in which the electro-optical device is arranged in the optical component casing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Optical unit, 4 ... Optical component housing, 5 ... Mounting part, 26 ... Projection lens, 42A, 45A ... Screw hole, 42B, 45B ... Positioning boss, 52, 53, 54, 55 ... Arm Part, 52A, 55A ... round hole, 211 ... light source, 252 ... electro-optical device, 253 ... liquid crystal panel, 255 ... cross dichroic prism, 521, 551 ... notch, 522, 552 ... biasing part, L, LR, LG , LB ... optical axis, SC ... screw.

Claims (5)

An electro-optical device that modulates a light beam emitted from a light source according to image information to form image light, a projection optical device that projects the image light, an optical axis of the light beam is set inside, and the electro-optical device A projector comprising: a device and a housing for optical components that disposes the projection optical device at a predetermined position on the optical axis;
The optical component housing includes a positioning unit for positioning the electro-optical device with respect to the optical axis,
A holding part for holding the electro-optical device and attaching the electro-optical device to the optical component casing;
The attachment portion has an engagement portion that engages with the positioning portion,
When the electro-optical device is disposed in the optical component casing, the electro-optical device is predetermined with respect to the optical component casing. And a biasing portion for engaging the positioning portion and the engaging portion. The projector according to claim 1,
The positioning portion, the engaging portion, and the urging portion are provided as a pair, and the electro-optical device is attached in the optical axis direction by one of the urging portions of the positioning portion and the engaging portion. The other positioning part and the engaging part are urged toward the vertical plane passing through the optical axis by the other urging part. A projector characterized by being engaged. The projector according to claim 2,
The optical component housing is provided with a pair of screw holes for mounting the electro-optical device,
The attachment portion protrudes from the electro-optical device in a plan view and has a pair of arm portions provided substantially diagonally, and the engagement portion and the engagement are provided near the distal ends of the pair of arm portions. The projector is characterized in that a hole is provided adjacent to the part and through which a screw that is screwed into the screw hole is inserted. The projector according to claim 3, wherein
The engaging portion is positioned such that a force in a rotation direction when a screw is screwed into the screw hole is transmitted from the engaging portion to the positioning portion with respect to the positioning portion. Projector. The projector according to any one of claims 1 to 4, wherein
The projector according to claim 1, wherein the urging portion is formed integrally with either the mounting portion or the optical component casing.

Images