JP2008129271A - Rear projector - Google Patents

Abstract

A rear projector capable of easily adjusting a display position of a projected image on a screen in a finished product state.
A rear projector (1) includes a reflection mirror (5) centered on a horizontal axis passing through an optical path center point intersecting with an optical path center (O) of image light (L) enlarged and projected from an image projection device (3) on a reflection surface of the reflection mirror (5). A part of the shaft support portion 7A that is rotatably supported and a first opening formed in the exterior housing 2 is exposed, and is configured to be operable from the exterior of the exterior housing 2. The reflection mirror is centered on the horizontal axis. 5 is connected to the first adjustment operation portion 8 that enables rotation adjustment and the shaft support portion 7A, and a part is exposed through a second opening formed in the exterior housing 2 to be operated from the exterior of the exterior housing 2 And a second adjustment operation unit 9 that is configured to be capable of adjusting the position of the shaft support 7A in a direction orthogonal to the reflection surface of the reflection mirror 5.
[Selection] Figure 1

Description

  The present invention relates to a rear projector.

2. Description of the Related Art Conventionally, as a display device having a large screen, a rear projector that displays an enlarged image light on a screen is known (see, for example, Patent Document 1).
The rear projector described in Patent Document 1 modulates a light beam emitted from a light source in accordance with image information to form image light to be enlarged and project it, and an exterior housing the image projection apparatus A housing, a screen that is installed on the front surface of the exterior housing and projects image light enlarged and projected from the image projection device, and a reflection mirror that converts the optical path of the image light enlarged and projected from the image projection device and guides it to the back of the screen It has.
In such a rear projector, it is necessary to adjust the relative position of each component (image projection apparatus, reflection mirror, screen, etc.) and adjust the position of the projected image on the screen. In the rear projector described in Patent Document 1, an adjustment mechanism is provided on the base unit on which the image projection apparatus is placed and fixed, and the attitude of the image projection apparatus is changed by the adjustment mechanism to adjust the projection direction of the image projection apparatus. Structure is adopted.

JP 2002-107663 A

By the way, the rear projector which is in the state of the assembled assembled product has each component (image projection device) of the rear projector due to secondary factors such as external force and the environment in which it is installed (temperature, shape of the installation surface to be installed). The relative position of the exterior casing, screen, reflecting mirror, etc.) may change from the relative position adjusted during the assembly process. That is, in the rear projector, the relative position of each component member changes due to the secondary factors described above, and the display position of the projected image on the screen may deviate from the display position adjusted during the assembly process. There is.
However, in the rear projector described in Patent Document 1, assuming a structure in which the display position adjustment of the projected image on the screen is performed during the assembly process of the rear projector, an adjustment mechanism is provided inside the exterior housing, and the adjustment mechanism The projection direction of the image projection apparatus is adjusted. That is, the rear projector described in Patent Document 1 employs a structure in which the projection direction of the image projection apparatus is adjusted by an adjustment mechanism disposed inside the exterior casing, so that the projected image on the screen in a finished product state. It is difficult to adjust the display position.

  An object of the present invention is to provide a rear projector capable of easily adjusting the display position of a projected image on a screen in a finished product state.

  The rear projector of the present invention is an image projection device that modulates a light beam emitted from a light source according to image information to form an image light and project it in an enlarged manner, an exterior housing having a box shape that houses the image projection device, A rear projector including a screen for projecting image light enlarged and projected from the image projection device, which is exposed on one of the box-shaped side surfaces of the exterior casing, and is enlarged and projected from the image projection device A reflection mirror disposed in the optical path of the image light and reflecting the image light to guide it to the screen, and an optical path intersecting with the optical path center of the image light enlarged and projected from the image projection device on the reflection surface of the reflection mirror A shaft support portion that rotatably supports the reflection mirror about a horizontal axis passing through a center point, and a position corresponding to the arrangement position of the reflection mirror in the exterior casing. A first adjustment operation unit configured to be partly exposed through the first opening and operable from the exterior of the exterior housing, and capable of rotating and adjusting the reflection mirror about the horizontal axis; Connected to the shaft support part, partly exposed through a second opening formed at a position corresponding to the position of the shaft support part in the exterior housing, and configured to be operable from the outside of the exterior housing, And a second adjustment operation section that enables position adjustment of the shaft support section in a direction orthogonal to the reflection surface of the reflection mirror.

According to the present invention, the rear projector includes the image projection device, the exterior casing, the screen, and the reflection mirror, as well as the shaft support, the first adjustment operation unit, and the second adjustment operation unit. As shown below, the display position adjustment of the projected image on the screen can be easily performed in a finished product state.
That is, the shaft support portion rotatably supports the reflection mirror about a predetermined horizontal axis. Here, the horizontal axis means an axis extending in the horizontal direction through an optical path center point intersecting the optical path center of the image light enlarged and projected from the image projection device on the reflection surface of the reflection mirror. The optical path center means an optical path that follows the vicinity of the center of the projected image projected on the screen in the image light enlarged and projected from the image projection apparatus.
The first adjustment operation part is configured to be partly exposed through the first opening formed in the exterior casing and operable from outside the exterior casing, and is operated from outside the exterior casing, The reflection mirror can be rotationally adjusted around the horizontal axis. That is, the position of the projected image on the screen can be adjusted in the vertical direction by rotating and adjusting the reflecting mirror around the horizontal axis.

  The second adjustment operation part is connected to the shaft support part, partly exposed through a second opening formed in the exterior casing and configured to be operable from outside the exterior casing. By being operated, the position of the shaft support portion can be adjusted in a direction perpendicular to the reflection surface of the reflection mirror. For example, on the horizontal axis, a shaft support portion is provided on each of the one end side and the other end side, and a second adjustment operation portion is provided corresponding to each shaft support portion, and either one of the second adjustment operation portions is provided. By adjusting the position of one of the shaft support portions, the one end side or the other end side along the horizontal axis of the reflection mirror together with the one shaft support portion is moved in a direction perpendicular to the reflection surface of the reflection mirror, and the reflection surface The reflecting mirror can be rotated and adjusted around an axis (hereinafter, a vertical axis) perpendicular to the horizontal axis. That is, by rotating and adjusting the reflection mirror around the vertical axis, the position of the projected image on the screen can be adjusted in the left-right direction.

Therefore, the relative position of each component of the rear projector (image projection device, exterior housing, screen, reflection mirror, etc.) depends on secondary factors such as external force and the environment in which it is installed (temperature, the shape of the installation surface to be installed). Even if the display position of the projected image on the screen is changed from the relative position adjusted during the assembly process and the display position adjusted during the assembly process is shifted in the vertical and horizontal directions, the first adjustment is performed from the outside of the exterior housing. By operating the operation unit or the second adjustment operation unit, it is possible to easily correct the display position shift.
Further, since both the first adjustment operation unit and the second adjustment operation unit are provided, the relative position of each component of the rear projector changes from the relative position adjusted during the assembly process due to secondary factors. Even when the projected image on the screen is distorted, the distortion of the projected image can be easily corrected by operating the first adjustment operation unit and the second adjustment operation unit in an appropriate combination. .

In the rear projector according to the aspect of the invention, the reflection mirror has a mirror main body that reflects the image light and guides the image light to the screen, and a frame shape that extends along at least a part of the outer edge of the mirror main body. It is preferable to provide a reinforcing member sandwiched from the side and the back side.
By the way, when the structure in which the attitude state of the reflection mirror is adjusted by the shaft support unit, the first adjustment operation unit, and the second adjustment operation unit is adopted, the reflection mirror is distorted when the reflection mirror is adjusted, and the projected image is displayed. There is a risk of distortion.
In the present invention, the reflection mirror includes a reinforcing member in addition to the mirror body. Thus, the strength of the mirror main body can be maintained by the reinforcing member, and even when the posture state of the reflecting mirror is adjusted, distortion of the mirror main body can be avoided and the projection image can be maintained satisfactorily.

  In the rear projector according to the aspect of the invention, the first adjustment operation unit can be moved forward and backward through the first opening, and one end side of the first adjustment operation unit is in contact with the reflection mirror. An operation unit main body capable of rotating and adjusting the reflection mirror in a predetermined direction around the horizontal axis, and disposed between the reflection mirror and the exterior casing, and the reflection mirror is arranged in the predetermined direction around the horizontal axis And an urging member for urging in the opposite direction.

In the present invention, since the first adjustment operation unit includes the operation unit main body and the urging member, the reflection mirror can be rotationally adjusted around the horizontal axis as described below.
That is, by operating the operation unit main body to advance the operation unit main body into the exterior housing and pressing the reflecting mirror on one end side of the operation unit main body, against the urging force of the urging member, The reflection mirror can be rotated and adjusted in a predetermined direction around the horizontal axis.
On the other hand, when the operation unit main body is operated to move the operation unit main body out of the exterior casing, the horizontal force is applied until the reflecting mirror comes into contact with one end side of the operation unit main body by the urging force of the urging member. The reflection mirror can be rotated and adjusted in the direction opposite to the predetermined direction about the axis.
If it is set as the above structures, a reflective mirror can be easily adjusted to two rotation directions centering on a horizontal axis only by operation of an operation part main part.
Further, even when an external force is applied to the rear projector in the vertical direction and the external force is applied to the first adjustment operation unit, the urging member expands again after the urging member is temporarily contracted by the external force. Thus, the reflecting mirror can be brought into contact with one end side of the operation unit main body, and the reflecting mirror can be returned to the original rotational position. That is, even when an external force is applied in the vertical direction with respect to the rear projector, the external force can be relaxed by the urging member, and damage to the first adjustment operation unit can be avoided.

In the rear projector according to the aspect of the invention, the outer casing can cover at least one of the first opening and the second opening, and can be attached to and detached from the outer casing. It is preferable that the member is attached.
According to the present invention, since the cover member is attached to the exterior casing, if the cover member is removed only when adjusting the display position of the projected image on the screen, the first opening and the second A part of the first adjustment operation part and a part of the second adjustment operation part are not always exposed through the opening. For this reason, when the display position adjustment of the projected image on the screen is not performed, the first adjustment operation unit and the second adjustment operation unit are not erroneously operated by attaching the cover member. In addition, the appearance of the rear projector can be maintained well.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Main configuration of rear projector]
FIG. 1 is a side sectional view schematically showing a schematic configuration of the rear projector 1.
As shown in FIG. 1, the rear projector 1 is roughly configured by an exterior housing 2, a projector unit 3 as an image projection apparatus, a control unit 4, a reflection mirror 5, and a screen 6.

The exterior casing 2 is a casing made of synthetic resin. As shown in FIG. 1, the projector unit 3, the control unit 4, the reflection mirror 5, and the screen 6 are accommodated in the interior. Although not specifically shown, a power supply unit for supplying power to each component of the rear projector 1 in addition to the projector unit 3, the control unit 4, the reflection mirror 5, and the screen 6 inside the exterior housing 2. A cooling unit that cools the interior of the rear projector 1 and a sound output unit that outputs sound are disposed.
As shown in FIG. 1, the exterior casing 2 includes a screen support portion 21, a mirror support portion 22, a rear cover 23, and a base plate 24, and these members 21 to 24 are combined with screws or the like to form a box. It is configured as a shape housing.

  As shown in FIG. 1, the screen support portion 21 is a portion that is disposed on the front side (the side where the viewer is located) of the rear projector 1 and supports the screen 6. As shown in FIG. 1, the screen support portion 21 is formed in a rectangular frame shape having an opening 211 having a rectangular shape in plan view, and the periphery of the opening 211 so that the front side of the screen 6 is exposed through the opening 211. The screen 6 is supported by the part.

As shown in FIG. 1, the mirror support portion 22 is a portion that is disposed on the upper side of the rear projector 1 and on the rear side (the side opposite to the side where the viewer is located) and supports the reflection mirror 5. The mirror support portion 22 has a substantially U-shaped vertical cross section, and as shown in FIG. 1, the upper surface side and the left and right side surfaces of the rear projector 1 (the side surfaces intersecting the direction orthogonal to the paper surface in FIG. 1). And part of the back side. Further, the back surface portion of the mirror support portion 22 has a shape that is inclined so that the lower end edge is located on the rear side (side away from the screen support portion 21 (screen 6)) with respect to the upper end edge. The mirror support portion 22 has an upper end connected to the upper end of the screen support 21 by screws or the like, and a lower end connected to the upper end of the rear cover 23 by screws or the like.
The detailed structure of the mirror support portion 22 (support structure of the reflection mirror 5) will be described later.

  As shown in FIG. 1, the rear cover 23 is disposed on the lower side and the rear side of the rear projector 1, has a substantially U-shaped longitudinal section, and the left and right side surfaces and the rear side of the rear projector 1 are mirror support portions. 22 is a portion covered with the cover.

As shown in FIG. 1, the base plate 24 is a portion that is disposed below the rear projector 1 and supports the entire rear projector 1. The base plate 24 is formed in a plate shape and covers the lower surface side of the rear projector 1 as shown in FIG.
In the base plate 24, a connection portion 241 for connecting to the screen support portion 21 and the rear cover 23 is erected on the plate-like upper end surface as shown in FIG. 1.
The base plate 24 is connected to the lower end portion of the screen support portion 21 and the lower end portion of the rear cover 23 by screws or the like at the connection portion 241, and the projector unit 3 and the control unit 4 are provided on the plate-like upper end surface. When the rear projector 1 is installed on an installation surface such as a floor or a desk, the plate-like lower end surface abuts on the installation surface and supports the entire rear projector 1.

  The projector unit 3 forms the image light L based on the image signal output from the control unit 4 and projects the enlarged light toward the reflection mirror 5. Although not specifically shown, the projector unit 3 images a light source (for example, a discharge light source lamp or a solid light emitting element such as an LED (Light Emitting Diode)) and a light beam emitted from the light source. A light modulation device that modulates based on a signal to form image light L (for example, a liquid crystal panel, a liquid crystal light valve including an incident-side polarizing plate and an emission-side polarizing plate), and a projection lens that enlarges and projects the image light L 31 (FIG. 1) and the like.

  Although not specifically shown, the control unit 4 includes, for example, a tuner, an IF circuit, an audio detection circuit, a video detection circuit, an amplification circuit, a CPU, and the like, and comprehensively controls the projector unit 3. . Further, the control unit 4 extracts, for example, a broadcast signal having a frequency corresponding to a channel selected by operating a remote controller (not shown), outputs an image signal to the projector unit 3, and outputs an audio signal to an audio output unit. (Not shown).

  As shown in FIG. 1, the reflection mirror 5 is supported by the mirror support portion 22, and the image light L enlarged and projected upward by the projector unit 3 is on the front side of the rear projector 1 (the back side of the screen 6). Reflect towards With such a configuration, it is not necessary to separate the projector unit 3 and the screen 6 from each other by the length of the projection distance, for example, as compared with a configuration in which the reflecting mirror 5 is not used. The rear projector 1 can be arranged in close proximity, and the rear projector 1 can be made compact and the rear projector 1 can be made thinner.

The reflection mirror 5 is composed of a mirror main body 51 (see FIG. 2) having a rectangular shape in plan view, which is a general mirror, and a reinforcing member 52 (see FIG. 2) that reinforces the strength of the mirror main body 51. Yes.
The reinforcing member 52 is formed by subjecting a metal material such as aluminum to sheet metal processing. The reinforcing member 52 has a rectangular frame shape in plan view that is bent along the outer edge of the mirror body 51, and has a frame shape. Each edge that intersects the direction orthogonal to the opening surface has a substantially U-shaped cross-section that is bent toward the inside of the frame-shaped opening. The reinforcing member 52 holds and fixes the outer edge portion of the mirror body 51 from the front side and the back side at a pair of U-shaped bent portions 521A and 521B (see FIGS. 2 and 4) in the frame-shaped opening. To do. Further, between the pair of bent portions 521A and 521B, an elastic member 522 (see FIG. 4) having a rectangular frame shape in plan view is interposed between the bent portion 521B located on the back side and the back side of the mirror body 51. Has been.

In the reinforcing member 52, a pair of receiving portions 523A and 523B (see FIGS. 2 and 4) for adjusting the posture of the reflecting mirror 5 are formed at the upper end and the lower end. Yes.
The pair of receiving portions 523A and 523B are formed at positions corresponding to an upper side and a lower side of an optical path center point Op described later in a state where the mirror main body 51 is sandwiched and fixed by the reinforcing member 52, and each plate surface is a front surface. The reinforcing member 52 is formed in a plate shape that protrudes upward and downward from the upper and lower ends of the reinforcing member 52 so as to face the side and the rear side, respectively.
Moreover, insertion hole 523B1 (refer FIG. 2, FIG. 4) which penetrates front and back is formed in the receiving part 523B located in the downward side among a pair of receiving parts 523A and 523B.

And the reflection mirror 5 demonstrated above is comprised so that adjustment of a posture state is possible while being supported by the exterior housing 2 (mirror support part 22).
The posture adjustment structure of the reflection mirror 5 will be described later.

  As shown in FIG. 1, the screen 6 is supported by a screen support unit 21 and is composed of a transmissive screen that projects the image light L incident through the reflection mirror 5 from the back side to the front side and displays a projected image. Has been. Although not specifically shown, the screen 6 is composed of a Fresnel lens sheet disposed on the back side and a lenticular lens sheet disposed on the front side. The light L is converted into parallel light by the Fresnel lens sheet, the parallel light is converted into enlarged (diffused) light by the lenticular lens sheet, and the image light L is projected from the back side to the front side to be a projected image. Is displayed.

[Reflection mirror posture adjustment structure]
2 to 4 are views showing the posture adjustment structure of the reflecting mirror 5. Specifically, FIG. 2 is a view of the posture adjustment structure of the reflection mirror 5 as seen from the front side. FIG. 3 is a cross-sectional view taken along line AA in FIG. 4 is a cross-sectional view taken along line BB in FIG.
As shown in FIGS. 2 to 4, the reflecting mirror 5 has a pair of shaft support portions 7A and 7B (the right shaft support portion is 7A and the left shaft support portion is 7B when viewed from the front side. FIGS. 2 and 3). ), The first adjustment operation unit 8 (FIG. 4), and the pair of second adjustment operation units 9 (FIG. 3), the posture state with respect to the projector unit 3 can be adjusted.
In addition, a pair of 2nd adjustment operation part 9 is provided corresponding to a pair of shaft support part 7A, 7B. FIG. 3 shows only the second adjustment operation portion provided corresponding to the shaft support portion 7A out of the pair of second adjustment operation portions 9, but provided corresponding to the shaft support portion 7B. The second adjustment operation unit has the same configuration as the second adjustment operation unit 9 shown in FIG.

The pair of shaft support portions 7A and 7B support the reflection mirror 5 so as to be rotatable about a predetermined horizontal axis H. Each of the shaft support portions 7A and 7B has the same configuration, and includes a rotation shaft 71 and a rotation shaft holder 72 as shown in FIG. 2 or FIG.
As shown in FIG. 2 or 3, the rotating shaft 71 is a columnar member that protrudes from the position intersecting the horizontal axis H so that the columnar axis extends along the horizontal axis H at the left and right ends of the reinforcing member 52. It is. Here, the horizontal axis H is an optical path center point Op (an abbreviation of the mirror body 51) that intersects the optical path center O (FIG. 1) of the image light L enlarged and projected from the projector unit 3 on the reflection surface 51A of the mirror body 51. It means an axis passing through the center position (center of gravity position, FIG. 2 and FIG. 3) and extending in the horizontal direction (in FIG. 1 and FIG. 3, the direction perpendicular to the plane of the paper, in FIG. The optical path center O means an optical path that follows the vicinity of the center of the projected image projected on the screen 6 in the image light L enlarged and projected from the projector unit 3.

As shown in FIG. 2 or FIG. 3, the rotary shaft holder 72 is formed in a block shape and has a circular hole 721 through which the tip portion of the rotary shaft 71 can be inserted, and the tip of the rotary shaft 71 is inserted into the circular hole 721. The rotating shaft 71 (reflection mirror 5) is rotatably supported in a state where the portion is inserted.
In the rotary shaft holder 72, a screw hole 722 that is screwed into the second adjustment operation unit 9 is formed in the end surface on the back side.

The first adjustment operation unit 8 is configured to be operable from the outside of the exterior housing 2 and is rotated to adjust the reflection mirror 5 about the horizontal axis H. As shown in FIG. 4, the first adjustment operation unit 8 includes an operation unit main body 81 and a rotation state maintaining unit 82.
Here, before describing the configuration of the operation unit main body 81 and the rotation state maintaining unit 82, the detailed structure of the mirror support unit 22 will be described.

  As shown in FIG. 4, in the back surface portion of the mirror support portion 22, a portion corresponding to the receiving portion 523 </ b> A on the upper side of the reflection mirror 5 penetrates the exterior housing 2 and exposes a part of the operation portion main body 81. A first adjustment operation opening 221 is formed as a first opening that can be made. As shown in FIG. 4, the first adjustment operation opening 221 has a stepped upper side with a larger opening area on the outer side (back side) than on the inner side (front side) of the rear surface portion of the mirror support 22. The lower side is formed in a stepped shape having a larger opening area on the inner surface side than the outer surface side in the back surface portion of the mirror support portion 22.

Further, as shown in FIG. 4, the inner surface of the rear surface portion of the mirror support portion 22 has a mounting portion 222 having a screw hole 222 </ b> A that engages with the operation portion main body 81 at the peripheral portion of the first adjustment operation opening portion 221. Is fixed by a fixing screw 222B.
Further, as shown in FIG. 4, a cover member 223 that can close the first adjustment operation opening 221 and is detachable from the mirror support 22 is attached to the mirror support 22. . As shown in FIG. 4, the cover member 223 is formed in a plate shape having a crank shape whose lower end is offset toward the inside of the first adjustment operation opening 221.

And when attaching the cover member 223 to the mirror support part 22, it implements as follows.
That is, the lower end portion of the cover member 223 is inserted into the first adjustment operation opening 221 in a state where the cover member 223 is inclined with respect to the back surface portion of the mirror support portion 22.
Thereafter, the cover member 223 is made parallel to the back surface portion of the mirror support portion 22, the lower end portion of the cover member 223 is brought into contact with the second step portion 221B on the lower side of the first adjustment operation opening portion 221, and The upper side of the cover member 223 is brought into contact with the first step portion 221A on the upper side of the first adjustment opening 221.
Then, the cover member 223 is attached to the mirror support portion 22 by screwing the fixing screw 223 </ b> A into the mirror support portion 22 via the cover member 223.
In addition, when removing the cover member 223 from the mirror support part 22, operation reverse to the above is implemented.

Further, in the back surface portion of the mirror support portion 22, at a position corresponding to the receiving portion 523 B on the lower side of the reflection mirror 5, as shown in FIG. An installation opening 224 that allows the support pin to be installed is formed.
Further, on the inner surface of the back surface portion of the mirror support portion 22, as shown in FIG. 4, a mounting portion 225 having a screw hole 225 </ b> A screwed to the support pin at the peripheral portion of the installation opening 224 is fixed by a fixing screw 225 </ b> B. It is fixed.
Furthermore, as shown in FIG. 4, the mirror support portion 22 is provided with a cover member 226 for closing the installation opening 224 after the support pin is installed through the installation opening 224. Yes.

  As shown in FIG. 4, the operation portion main body 81 is integrally formed with a rotation end 811 that can be rotated and a pin-shaped portion 812 that protrudes from the rotation end 811 and has an outer periphery formed with a thread groove 812 </ b> A. It is. Then, the operation portion main body 81 is inserted into the exterior casing 2 through the first adjustment operation opening 221, and the screw groove 812 </ b> A of the pin-like portion 812 is screwed into the screw hole 222 </ b> A of the attachment portion 222. It is attached to the attachment part 222. In this state, when the cover member 223 is removed from the mirror support portion 22, the rotating end 811 of the operation unit main body 81 is exposed to the outside of the exterior housing 2, and the pin-shaped portion 812 of the operation unit main body 81 is inside the exterior housing 2. The tip part protrudes and abuts on the receiving part 523A on the upper side of the reflection mirror 5. Then, by rotating the rotary end 811 to change the screwed state of the screw groove 812A and the screw hole 222A, the operation unit main body 81 moves forward and backward in and out of the exterior housing 2. That is, the rotation end 811 is rotated to advance the operation unit main body 81 toward the exterior housing 2, and the receiving portion 523 </ b> A is pressed at the tip portion of the pin-shaped portion 812, so that the horizontal axis H is the center. The reflection mirror 5 can be rotated and adjusted in the direction of the arrow R1 (FIG. 4).

As shown in FIG. 4, the rotation state maintaining unit 82 includes a support pin 821 and a coil spring 822 as an urging member.
As shown in FIG. 4, the support pin 821 is formed integrally with a rotation end 821A that can be rotated and a pin-like portion 821B that protrudes from the rotation end 821A.
The pin-shaped portion 821B has an outer dimension smaller than the inner diameter dimension of the insertion hole 523B1 formed in the receiving portion 523B on the lower side of the reflection mirror 5, and can be inserted into the insertion hole 523B1. Further, as shown in FIG. 4, a thread groove 821B1 is formed on the outer periphery of the pin-shaped portion 821B in the vicinity of the rotating end 821A. Then, the support pin 821 is inserted into the exterior housing 2 through the installation opening 224, and is fixed to the attachment portion 225 by screwing the screw groove 821B1 of the pin-like portion 821B into the screw hole 225A of the attachment portion 225. Is done. In this state, the tip end portion of the pin-shaped portion 821B is inserted in a loosely inserted state into an insertion hole 523B1 formed in the receiving portion 523B on the lower side of the reflection mirror 5. That is, the reflection mirror 5 is supported by the pin-like portion 821B of the support pin 821, and when the rotation is adjusted, the movement of the lower side end portion is guided along the protruding direction of the pin-like portion 821B.
The coil spring 822 has one end connected to the attachment portion 225 and the other end connected to the receiving portion 523B on the lower side of the reflection mirror 5 with the pin-like portion 821B of the support pin 821 inserted therethrough. On the other hand, the receiving portion 523B of the reflecting mirror 5 is urged in the direction of the arrow R2 (FIG. 4).

Then, the reflection mirror 5 is rotated and adjusted around the horizontal axis H as described below by the operation unit main body 81 and the rotation state maintaining unit 82 described above.
That is, the rotary end 811 of the operation unit main body 81 is rotated to advance the operation unit main body 81 toward the exterior housing 2 and the receiving portion 523A is pressed by the tip end portion of the pin-like portion 812, thereby reflecting the mirror. 5 moves to the front side, and the lower side of the reflection mirror 5 moves to the back side along the pin-shaped portion 821B of the support pin 821 against the biasing force of the coil spring 822, and the arrow about the horizontal axis H The reflection mirror 5 can be adjusted in rotation in the R1 (FIG. 4) direction.
On the other hand, when the rotation end 811 of the operation unit main body 81 is rotated to advance the operation unit main body 81 toward the outside of the exterior housing 2, the lower side of the reflection mirror 5 is supported by the biasing force of the coil spring 822. It moves to the front side along the pin-like portion 821B of 821, moves to the back side until the upper side (receiving portion 523A) of the reflecting mirror 5 abuts on the tip portion of the pin-like portion 812, and the horizontal axis H is the center. The reflection mirror 5 can be rotated and adjusted in the direction of the arrow R2 (FIG. 4).

The pair of second adjustment operation portions 9 are configured to be operable from the exterior of the exterior housing 2 and are operated to position the pair of shaft support portions 7A and 7B in a direction orthogonal to the reflection surface 51A of the mirror body 51, respectively. adjust. Each of these second adjustment operation units 9 has the same configuration, and includes an operation unit main body 91 and a movement restriction unit 92, as shown in FIG.
Here, before describing the configuration of the operation unit main body 91 and the movement restricting unit 92, the detailed structure of the mirror support unit 22 will be described.
As shown in FIG. 3, in the back surface portion of the mirror support portion 22, as shown in FIG. 3, a part of the operation portion main body 91 can be exposed through the inside and outside of the exterior housing 2. A second adjustment operation opening 227 is formed as a second opening. These second adjustment operation openings 227 have the same shape, and are located at the first step 227A located at the center of the opening and at the outer portion of the first step 227A, as shown in FIG. It has the 2nd level | step-difference part 227B, and is formed in the step shape which an opening area becomes large toward an outer side from the opening center position.
Further, in the second adjustment operation opening 227, on the lower side of the second stepped portion 227B, as shown in FIG. 3, a cover opening for passing through the inside and outside of the exterior housing 2 and attaching a cover member to be described later is provided. A portion 228 is formed. As shown in FIG. 3, the cover opening 228 is formed in a stepped shape having a larger opening area on the inner surface side than the outer surface side in the back surface portion of the mirror support portion 22 on the lower side.

  Further, as shown in FIG. 3, each mirror support portion 22 is provided with a cover member 229 that can close each second adjustment operation opening 227 and can be attached to and detached from the mirror support portion 22. It has been. These cover members 229 have the same shape, and as shown in FIG. 4, like the cover member 223 described above, a plate having a crank shape in which the lower end is offset toward the inside of the cover opening 228. It is formed in a shape.

And when attaching the cover member 229 to the mirror support part 22, it implements as follows.
That is, the lower end portion of the cover member 229 is inserted into the cover opening 228 in a state where the cover member 229 is inclined with respect to the back surface portion of the mirror support portion 22.
Thereafter, the cover member 229 is made parallel to the back surface portion of the mirror support portion 22, the lower end portion of the cover member 223 is brought into contact with the step portion 228A of the cover opening portion 228, and the upper side of the cover member 223 is set to the second side. The second stepped portion 227B of the adjusting operation opening 227 comes into contact with the second stepped portion 227B.
The cover member 229 is attached to the mirror support portion 22 by screwing the fixing screw 229A into the mirror support portion 22 via the cover member 229.
In addition, when removing the cover member 229 from the mirror support part 22, operation reverse to the above is implemented.

As shown in FIG. 3, the operation portion main body 91 is integrally formed with a rotation end 911 that can be rotated and a pin-shaped portion 912 that protrudes from the rotation end 911.
The rotating end 911 has an outer diameter that is larger than the inner diameter of the opening 227C (FIG. 3) inside the first step 227A in the second adjustment operation opening 227, and the first step 227A and It has an outer diameter smaller than the inner diameter of the opening 227D (FIG. 3) formed by the second step portion 227B.
The pin-shaped portion 912 has an outer diameter smaller than the inner diameter of the opening 227C in the second adjustment operation opening 227, and a thread groove 912A is formed on the outer periphery of the tip portion.

The operation portion main body 91 is inserted into the exterior casing 2 through the opening 227C in the second adjustment operation opening 227, and the screw groove 912A of the pin-shaped portion 912 is inserted into the screw hole 722 in the shaft support portions 7A and 7B. It is attached by screwing into In this state, the rotation end 911 of the operation portion main body 91 is in contact with the first step portion 227A in the second adjustment operation opening 227, and is rotated when the cover member 229 is removed from the mirror support portion 22. The end 911 is exposed outside the exterior housing 2.
That is, the reflection mirror 5 is supported by the mirror support portion 22 by the operation portion main bodies 91 of the pair of second adjustment operation portions 9 via the pin-shaped portion 821B of the support pin 821 and the shaft support portions 7A and 7B. It will be.

The movement restricting portion 92 is attached to the outer periphery of the pin-like portion 912, and sandwiches the peripheral portion (first step portion 227A) of the opening portion 227C in the second adjustment operation opening portion 227 with the rotation end 911. The movement of the main body 91 in and out of the exterior housing 2 is restricted.
That is, since the rotation end 911 is rotated to change the screwed state of the screw groove 912A and the screw hole 722, the movement restricting portion 92 restricts the movement of the operation portion main body 91 in and out of the outer casing 2. The shaft support portions 7A and 7B move forward and backward in the direction of arrow R3 (FIG. 3), which is a direction orthogonal to the reflecting surface 51A of the mirror body 51.

Then, the posture state of the reflection mirror 5 is adjusted by the above-described second adjustment operation units 9 as described below.
That is, among the second adjustment operation sections 9, the rotation end 911 of the operation section main body 91 in the second adjustment operation section 9 on the right side when viewed from the front side is rotated to move the shaft support section 7A forward and backward in the arrow R3 direction. By moving, the right side when viewed from the front side of the reflecting mirror 5 moves in the front-rear direction (in the direction of the arrow R3), and an axis orthogonal to the horizontal axis H (an axis extending in the vertical direction in FIG. 2, hereinafter referred to as a vertical axis). The reflection mirror 5 can be rotated and adjusted around the center.
Similarly, among the second adjustment operation units 9, the rotation end 911 of the operation unit main body 91 in the second adjustment operation unit 9 on the left side when viewed from the front side is rotated to move the shaft support unit 7B in the direction of the arrow R3. By moving forward and backward, the left side when viewed from the front side of the reflection mirror 5 is moved in the front-rear direction (arrow R3 direction), and the reflection mirror 5 can be rotated and adjusted around the vertical axis orthogonal to the horizontal axis H.

The embodiment described above has the following effects.
In the present embodiment, the rear projector 1 includes a pair of shaft support portions 7A that rotatably support the reflection mirror 5 about the horizontal axis H, in addition to the exterior housing 2, the projector unit 3, the reflection mirror 5, and the screen 6. 7B, a first adjustment operation unit 8 configured to be operable from the exterior of the exterior housing 2 and a pair of second adjustment operation units 9 configured to be operable from the exterior of the exterior housing 2. Then, by operating the first adjustment operation unit 8 from the outside of the exterior housing 2, the reflection mirror 5 can be rotated and adjusted around the horizontal axis H. That is, by rotating and adjusting the reflection mirror 5 about the horizontal axis H, the position of the projected image on the screen 6 can be adjusted in the vertical direction. In addition, by operating the pair of second adjustment operation units 9 from the outside of the exterior housing 2, the positions of the shaft support units 7 </ b> A and 7 </ b> B can be adjusted in a direction orthogonal to the reflection surface 51 </ b> A of the reflection mirror 5. That is, by adjusting the position of one of the shaft support portions 7A and 7B in the direction perpendicular to the reflecting surface 51A, the reflection mirror 5 is reflected on the side where the one of the shaft support portions is disposed. The reflection mirror 5 can be rotated and adjusted around the vertical axis (axis extending in the vertical direction in FIG. 2) perpendicular to the horizontal axis H on the reflection surface 51A by moving in a direction orthogonal to the surface 51A (arrow R3 direction). And That is, by rotating and adjusting the reflection mirror 5 about the vertical axis, the position of the projected image on the screen 6 can be adjusted in the left-right direction.

Therefore, each component of the rear projector 1 (projector unit 3, exterior housing 2, screen 6, reflection mirror 5, etc.) depends on secondary factors such as external force and the environment in which it is installed (temperature, shape of the installation surface to be installed). Even if the relative position of the housing changes from the relative position adjusted during the assembly process, and the display position of the projected image on the screen 6 deviates vertically and horizontally from the display position adjusted during the assembly process, the exterior casing 2 By operating the first adjustment operation unit 8 or the pair of second adjustment operation units 9 from the outside, it is possible to easily correct the display position shift.
In addition, since both the first adjustment operation unit 8 and the pair of second adjustment operation units 9 are provided, the relative position of each component of the rear projector 1 is adjusted during the assembly process due to secondary factors. Even when the projected image on the screen 6 is distorted due to a change from the relative position, the first adjustment operation unit 8 and the pair of second adjustment operation units 9 are appropriately combined and operated. The distortion of the projected image can be easily corrected.

Here, the reflection mirror 5 includes a reinforcing member 52 in addition to the mirror main body 51. Thus, the strength of the mirror main body 51 can be maintained by the reinforcing member 52, and the posture state of the reflecting mirror 5 can be changed by the shaft support portions 7A and 7B, the first adjustment operation portion 8, and the pair of second adjustment operation portions 9. Even during adjustment, distortion of the mirror main body 51 can be avoided and the projected image can be maintained satisfactorily.
Further, the shaft support portions 7A and 7B, the first adjustment operation portion 8, and the pair of second adjustment operation portions 9 are provided at the optical path center point Op on the reflection surface 51A (substantially center position (center of gravity position) of the mirror body 51). The attitude state of the reflecting mirror 5 is adjusted on the horizontal axis H passing through and the vertical axis passing through the optical path center point Op on the reflecting surface 51A and substantially perpendicular to the horizontal axis H. That is, the posture state of the reflection mirror 5 is adjusted by the shaft support portions 7A and 7B, the first adjustment operation portion 8, and the pair of second adjustment operation portions 9 on each axis passing through the center of gravity of the mirror body 51. Therefore, at the time of adjustment, distortion of the mirror main body 51 can be avoided and the projected image can be maintained well.

  Further, the first adjustment operation unit 8 includes an operation unit main body 81 and a rotation state maintaining unit 82 having a coil spring 822. Thereby, the reflection mirror 5 can be easily adjusted in two rotation directions (arrow R1, R2 directions) about the horizontal axis H by operating only the operation unit main body 81. Further, even when an external force is applied to the rear projector 1 in the vertical direction and the external force is applied to the first adjustment operation unit 8, the coil spring 822 is contracted once by the external force, and then again the coil spring 822. Is extended, the receiving portion 523A of the reflecting mirror 5 is brought into contact with the operation portion main body 81, and the reflecting mirror 5 can be returned to the original rotational position. That is, even when an external force is applied in the vertical direction to the rear projector 1, the external force can be relaxed by the coil spring 822, and damage to the first adjustment operation unit 8 can be avoided.

  Further, since the cover members 223 and 229 are attached to the exterior casing 2 (mirror support portion 22), if the cover members 223 and 229 only when adjusting the display position of the projected image on the screen 6 are removed. The rotation ends 811 of the first adjustment operation unit 8 and the rotation ends 911 of the pair of second adjustment operation units 9 are connected via the first adjustment operation opening 221 and the second adjustment operation opening 227. It is not always exposed. For this reason, when the display position adjustment of the projected image on the screen 6 is not performed, the first adjustment operation unit 8 and the pair of second adjustment operation units 9 are mistakenly attached by attaching the cover members 223 and 229. There is no fear of being operated. Further, the appearance of the rear projector 1 can be maintained satisfactorily.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the said embodiment, the structure of shaft support part 7A, 7B, the 1st adjustment operation part 8, and a pair of 2nd adjustment operation part 9 is not restricted to the structure demonstrated in the said embodiment.
That is, the following configuration may be adopted as the first adjustment operation unit 8.
For example, the rotation state maintaining unit 82 is omitted, the operation unit main body 81 and the receiving unit 523A are screwed together, and the screwing state is changed by operating the operation unit main body 81, so that the horizontal axis H is the center. The reflection mirror 5 may be configured to be rotatable.
Further, for example, a configuration in which the coil spring 822 is provided on the operation unit main body 81 side, that is, one end is connected to the mounting portion 222, the other end is connected to the receiving portion 523 A, and the receiving portion 523 B is connected to the mounting portion 222 with an arrow. It is good also as a structure biased in the direction opposite to R1 direction. At this time, the rotation state maintaining unit 82 may be omitted.
Further, for example, the first adjustment operation unit 8 is configured such that the reflection mirror 5 can be rotationally adjusted on the vertical axis that passes through the optical path center point Op on the reflection surface 51A and is substantially orthogonal to the horizontal axis H. However, as long as the reflection mirror 5 can be rotationally adjusted around the horizontal axis H, a configuration provided not only on the vertical axis but also at other positions may be adopted.

Further, the following configuration may be adopted as the second adjustment operation unit 9.
For example, in the above-described embodiment, the configuration in which two second adjustment operation units 9 are provided is adopted. As a configuration that only supports the shaft support portion as a function of the adjustment operation portion, and as a configuration that enables position adjustment of the shaft support portion as a function of the other second adjustment operation portion of the pair of second adjustment operation portions 9 It doesn't matter.
Further, for example, in the above-described embodiment, the configuration in which the pair of second adjustment operation units 9 is provided on the back surface portion of the mirror support unit 22 has been described, but the arrangement position is not particularly limited. You may employ | adopt the structure provided in the side part (The side surface which cross | intersects the direction orthogonal to a paper surface in FIG. 1) of the part 22. FIG.

In the embodiment, the reinforcing member 52 is configured in a frame shape along the entire outer edge portion of the mirror main body 51, but is configured in a frame shape as a whole along at least a part of the outer edge portion of the mirror main body 51. What is necessary is just to comprise, and you may comprise by two or more bodies.
In the above embodiment, the cover members 223 and 229 that can close the first adjustment operation opening 221 and the second adjustment operation opening 227 are provided, but the present invention is not limited thereto. A configuration in which the adjustment operation opening 221 and the second adjustment operation opening 227 can be closed with one cover member may be employed.

  In each of the embodiments, the configuration in which the rear projector 1 includes the control unit 4 has been described. However, the configuration is not limited thereto, and the rear projector 1 may be configured as a rear projection monitor that displays only an image based on an image signal input from an external device. Absent. In addition, the audio output unit can be configured separately from the exterior casing 2, or a configuration in which only an image is displayed without the audio output unit can be employed.

  In each of the above embodiments, the light modulation device constituting the projector unit 3 includes a digital micromirror device (trademark of Texas Instruments) in addition to a transmissive liquid crystal light valve and a reflective liquid crystal light valve. May be adopted.

Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but it is not intended to depart from the technical concept and scope of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  Since the display position of the projected image on the screen can be easily implemented in a finished product state, the present invention can be used as a rear projector used in a home theater or the like.

FIG. 2 is a cross-sectional view from the side schematically illustrating the schematic configuration of the rear projector in the embodiment. The figure which shows the attitude | position adjustment structure of the reflective mirror in the said embodiment. The figure which shows the attitude | position adjustment structure of the reflective mirror in the said embodiment. The figure which shows the attitude | position adjustment structure of the reflective mirror in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rear projector, 2 ... Exterior housing, 3 ... Projector unit, 5 ... Reflection mirror, 6 ... Screen, 7A, 7B ... Shaft support part, 8 ... 1st Adjustment operation unit, 9 ... second adjustment operation unit, 51 ... mirror body, 51A ... reflecting surface, 52 ... reinforcing member, 81 ... operation unit body, 822 ... coil spring 221 ... first adjustment operation opening (first opening), 223,229 ... cover member, 227 ... second adjustment operation opening (second opening), H: horizontal axis, L: image light, O: optical path center, Op: optical path center point.

Claims (4)

An image projection device that modulates a light beam emitted from a light source in accordance with image information to form image light and projects an enlarged image, an exterior housing having a box shape that houses the image projection device, and a box-shaped side surface of the exterior housing A rear projector provided with a screen that is exposed and provided to project image light enlarged and projected from the image projection device,
A reflection mirror disposed in an optical path of image light enlarged and projected from the image projection device, and reflecting the image light to the screen;
A shaft support portion that rotatably supports the reflection mirror around a horizontal axis passing through an optical path center point intersecting an optical path center of image light enlarged and projected from the image projection device on the reflection surface of the reflection mirror;
A part of the exterior casing is exposed through a first opening formed at a position corresponding to the arrangement position of the reflection mirror, and is configured to be operable from the exterior of the exterior casing, and the horizontal axis is the center. A first adjustment operation unit that enables rotation adjustment of the reflection mirror;
A part is exposed through a second opening formed at a position corresponding to an arrangement position of the shaft support portion in the exterior housing connected to the shaft support portion, and configured to be operable from the exterior of the exterior housing, A rear projector, comprising: a second adjustment operation unit that enables position adjustment of the shaft support part in a direction orthogonal to a reflection surface of the reflection mirror. The rear projector according to claim 1,
The reflection mirror is
A mirror body that reflects the image light and guides it to the screen;
A rear projector having a frame shape along at least a part of an outer edge portion of the mirror main body, and a reinforcing member that sandwiches the outer edge portion from the front side and the rear side. The rear projector according to claim 1 or 2,
The first adjustment operation unit includes:
It is possible to move forward and backward through the first opening through the first opening, and one end located inside the outer casing is in contact with the reflecting mirror so that the reflecting mirror can be rotated and adjusted in a predetermined direction around the horizontal axis. An operation unit main body and
A rear projector, comprising: an urging member disposed between the reflecting mirror and the exterior casing and urging the reflecting mirror in a direction opposite to the predetermined direction about the horizontal axis. The rear projector according to any one of claims 1 to 3,
A cover member is attached to the exterior housing so that at least one of the first opening and the second opening can be closed and detachable from the exterior housing. A rear projector characterized by

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