JP5064067B2 - Projection display device - Google Patents

Description

  The present invention relates to a projection display device, such as a rear projector, provided with a video output unit adjustment mechanism.

  Conventionally, in a projection display device such as a rear projector, when screen distortion such as screen tilt occurs on the display screen, it is necessary to adjust the projection direction of the video output unit. For example, in Patent Document 1 below, a complicated adjustment mechanism including a plurality of adjustment screws is provided below the video output unit, and the position of the video output unit is adjusted by this adjustment mechanism to correct screen distortion.

JP 2003-337379 A (pages 23 and 24, FIGS. 13 to 15)

  However, with the adjustment mechanism as described above, the screen distortion can be corrected and adjusted to the optimum position, but the adjustment mechanism is complicated, and thus high cost is inevitable. Moreover, since many screw fastening locations are complicated, the labor required for the adjustment work becomes great. Furthermore, when sufficient fixing and fastening cannot be performed, for example, when an external force such as vibration or impact is applied to transportation or the like, there is a problem in that the adjustment mechanism causes positional displacement and screen distortion occurs.

  In order to solve the above problems, an object of the present invention is to provide a simple adjustment mechanism for adjusting screen distortion, and screen distortion does not occur even when an external force such as vibration or impact is applied. It is an object of the present invention to provide a projection display device that can surely prevent positional misalignment.

In order to achieve the above object, a projection display device according to the present invention includes a video output unit that projects an image,
A screen for displaying an image projected from the video output unit;
A holding plate for supporting the video output unit;
A projection display device comprising a base for supporting the holding plate,
The holding plate is provided with a pair of bent portions,
The base portion is provided with a rib on the holding plate side,
A pair of screws that clamp the rib from both sides are screwed into a bent portion of the holding plate .

According to the present invention, it is possible to easily realize the position adjustment mechanism and the lock mechanism of the holding plate that supports the video output unit. For this reason, even if a large external force such as vibration or impact is applied after the video output unit is adjusted, positional displacement does not occur, and the occurrence of screen distortion can be reliably prevented.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing the internal configuration of the projection display apparatus according to Embodiment 1 of the present invention. Hereinafter, a rear projector will be described as an example of the projection display device according to the present invention. However, the present invention is applicable to projection devices and display devices such as various projectors.

  The projection display device 100 includes a screen 1, a mirror 2, a video output unit 3, and a housing 10 that accommodates these.

  In the following, for ease of understanding, the screen 1 in FIG. 1 is defined as the Y axis in the vertical upper direction, the horizontal direction of the screen 1 as the X axis, the front of the screen 1 as the Z axis, and the rotational direction around the X axis as θx and Y axis. The rotation direction around is θy, and the rotation direction around the Z axis is θz.

  The screen 1 is attached to the front opening of the housing 10 using a screen holding unit 11 and is configured as a transmissive screen that emits light projected from the back side to display an image. The video output unit 3 is installed inside the housing 10 and projects an image such as a color or monochrome moving image or a still image. The mirror 2 is installed obliquely on the inner back surface of the housing 10 using the mirror holding unit 12 and reflects the projection light from the video output unit 3 toward the screen 1.

  A base portion 13 is provided as a part of the housing 10 at the bottom of the housing 10. The base portion 13 supports the holding plate 4 so as to be slidable along the ZX plane. The video output unit 3 is supported by a holding plate 4.

  In such a projection display device, due to the assembly variation of the video output unit 3 itself and the assembly variation of the mirror 2 and the screen 1 with respect to the video output unit 3, the position variation of the projected image with respect to the display area of the screen 1, the so-called screen position shift. (Shift) and screen rotation shift (tilt, keystone) occur.

  Regarding the screen position deviation, the projection range of the optical system is set to be larger than the screen size, and in general, it is not necessary to correct mechanically. Further, of the screen rotation displacement, the mirror 2 and the screen 1 are symmetrical, so that there is almost no displacement in the θz direction.

  Also, in the θx direction, the tilt of the mirror 2 and the entire screen 1 rarely varies, and even when tilted, a shim or the like is placed between the base portion 13 and the holding plate 4 or between the mirror 2 and the mirror holding portion 10. It is possible to easily adjust the inclination by sandwiching between the two. Therefore, the adjustment in the θy direction will be described in detail.

  2A and 2B show a schematic configuration of the adjusting mechanism 110 according to the present invention. FIG. 2A is a side view seen from the X direction, and FIG. 2B is a perspective view seen from the back side. The holding plate 4 that supports the video output unit 3 is provided with a vertical bent portion, and a boss hole is formed in the bent portion. On the other hand, a vertical wall surface is formed on the base portion 13 so as to face the bent portion of the holding plate 4, and a boss portion 14 is formed on the wall surface. When the boss portion 14 of the base portion 13 and the boss hole of the holding plate 4 are engaged, the height direction (Y direction) of the holding plate 4 is regulated.

  Further, the base portion 13 is provided with a pivot portion 15 having a cylindrical surface having a generatrix in the Y direction. The holding plate 4 is provided with a V-shaped notch. With the V-shaped notch of the holding plate 4 in contact with the cylindrical surface of the pivot portion 15, the holding plate 4 can be rotated in the θy direction around the pivot portion 15, and the video output unit 3 is also along the θy direction. Can be rotated.

  A holding unit A5 that can be engaged with a part of the holding plate 4 is attached to the base portion 13, and the holding plate 4 rotates in the θy direction by the movement of the holding unit A5.

  FIG. 3 shows the operation of the holding unit A5, FIG. 3 (a) is an overall perspective view, and FIG. 3 (b) is an enlarged perspective view. As shown in FIG. 3B, the holding unit A5 is formed with a hole into which the eccentric pin 20 can be detachably inserted. The base portion 13 is formed with a hole into which the shaft of the eccentric pin 20 can be attached. The eccentric pin 20 has an eccentric cam surface, and the holding unit A5 is provided with a surface in contact with the cam surface.

  Further, the holding plate 4 is provided with a vertical bent portion 4a, and the holding unit A5 is formed with a notch portion 5a that can be engaged with the bent portion 4a.

  By rotating the eccentric pin 20 with the shaft of the eccentric pin 20 mounted in the hole of the base portion 13, the holding unit A5 moves in the left-right direction (X direction), and then the holding unit. The holding plate 4 can be rotated about the pivot portion 15 in the θy direction through the engagement between the notch portion 5a of A5 and the bent portion 4a of the holding plate 4.

  At this time, the image output unit 3 can be rotated along the θy direction without removing the holding plate 4 from the pivot portion 15 by rotating the holding unit A5 while pressing it toward the pivot portion 15. become.

  FIG. 4 is a perspective view showing how the video output unit 3 and the holding plate 4 rotate. FIG. 5 is an explanatory diagram showing the positional relationship between the reference frame 30 of the screen 1 and the projected image 31. FIG. 6 is a perspective view showing a lock mechanism of the holding plate 4.

  As shown in FIG. 4A, when the eccentric pin 20 is rotated and the holding unit A5 is moved to the left side, the video output unit 3 rotates along the θy direction. As a result, FIG. As shown, the projected image 31 rotates.

  Here, although the projection image 31 depends on the arrangement of the pivot portion 15, when the video output unit 3 is rotated along the θy direction, the optical axis (projection center axis) of the video output unit 3 is set to the Y axis. Since the screen is inclined, the screen moves with different behaviors on the upper side and the lower side of the projected image 31.

  Similarly, as shown in FIG. 4B, when the holding unit A5 is moved to the right side, the video output unit 3 rotates along the θy direction opposite to that in FIG. As shown in FIG. 5B, the projected image 31 rotates.

  Here, in the screen adjustment, it is necessary to accurately align the position of the projected image 31 with the reference frame 30 of the screen. Here, in particular, the screen position is adjusted based on the screen upper position where the sensitivity is high. That is, as shown in FIG. 5 (c), before adjustment, when the upper side of the projected image 31 is inclined, the screen is positioned so that the upper screen position is horizontal as shown in FIG. 5 (d). Adjust the position. Thereafter, as shown in FIG. 6B, the holding plate 4 is completely fixed to the base portion 13 by fastening the fixing bolt 21.

  By providing such a lock mechanism, even if a large external force such as vibration or impact is applied after adjusting the optical axis of the video output unit 3, it is possible to reliably prevent occurrence of screen distortion without causing positional displacement.

  Furthermore, in order to reinforce the lock by the fixing bolt 21, as shown in FIG. 6B, a friction surface 16 may be formed on one or both of the sliding surfaces facing each other of the holding plate 4 and the base portion 13. preferable. The friction surface 16 can be realized, for example, by providing a large number of notches on the surface or by roughening the surface, and when an external force such as vibration or impact is applied by increasing the frictional force, that is, the fastening force. Can be prevented, that is, screen distortion.

  Although the example in which the eccentric pin 20 is provided in the holding unit A5 has been described here, the eccentric pin 20 has a hole provided in the base 13 with a hole provided in the holding plate 4 interposed therebetween. A holding unit A5 that adjusts the orientation of the video output unit 3 may be added and fixed by rotating the holding plate 4 as an axis.

  FIG. 7 is a perspective view showing an attached state of the reinforcing member of the lock mechanism. The retaining plate 4 can be firmly fixed by adding a reinforcing member after the optical axis adjustment of the video output unit 3. As an example of the reinforcing member, as shown in FIG. 7A, a notch is provided on the end surface along the Z direction of the holding plate 4, and a reinforcing sheet metal 40 is provided so as to sandwich the notch, thereby adjusting the optical axis. After that, the reinforcing sheet metal 40 and the base portion 13 are fixed with fixing screws 41. Thereby, the displacement of the holding plate 4 in the X direction can be restricted.

  As another example of the reinforcing member, as shown in FIG. 7B, a reinforcing sheet metal 42 is added to the end surface along the X direction of the holding plate 4, and the reinforcing sheet metal 42 and the base portion 13 are fixed to the fixing screw 42. And fix. Thereby, the displacement of the holding plate 4 in the Z direction can be restricted.

  These reinforcing methods have the advantage that when the holding plate 4 is adjusted and fixed, access to the fixing screws 41 and 43 is easy, and the workability of adjustment and fixing is excellent. By this method, the holding plate 4 and the base portion 13 are firmly fixed, so that a positional shift caused by an external force does not occur.

Embodiment 2. FIG.
8 shows a schematic configuration of the adjusting mechanism 120 according to the second embodiment of the present invention. FIG. 8A is a perspective view seen from the back side, FIG. 8B is an exploded perspective view, and FIG. ) Is a partially enlarged view. In the first embodiment, when the rotation of the holding plate 4 is adjusted, the holding unit A5 is moved in the left-right direction (X direction). However, in this embodiment, the holding unit B6 is moved in the front-rear direction (Z direction). By doing so, the holding plate 4 is rotated.

  The base portion 13 is formed with an insertion groove 13a that allows displacement of the holding unit B6 in the Z direction and restricts displacement in the X direction.

  The configuration of the holding unit B6 is the same as that of the holding unit A5 of the first embodiment. As shown in FIG. 8C, the holding unit B6 is formed with a hole 8 into which an eccentric pin can be detachably inserted. ing. Further, the base portion 13 is formed with a hole into which the shaft of the eccentric pin can be attached. The eccentric pin has an eccentric cam surface, and the holding unit B6 is provided with a surface in contact with the cam surface.

  Further, the holding plate 4 is provided with a vertical bent portion 4a along the radial direction from the rotation center of the pivot portion 15, and the holding unit B6 has a notch portion 6a that can be engaged with the bent portion 4a. Is formed.

  By rotating the eccentric pin with the shaft of the eccentric pin mounted in the hole of the base portion 13, the holding unit B6 moves in the front-rear direction (Z direction). The holding plate 4 can be rotated about the pivot portion 15 in the θy direction through the engagement between the notch 6 a and the bent portion 4 a of the holding plate 4.

  Next, a method for adjusting the holding plate 4 will be described. By moving the holding unit B6 forward with an eccentric pin or the like, the holding plate 4 rotates clockwise, that is, in the direction shown in FIG. 4A, and as a result, in the direction of FIG. The screen rotates.

  Similarly, when the holding unit B6 is moved backward by an eccentric pin or the like, the holding plate 4 rotates counterclockwise, that is, in the direction shown in FIG. 4B, and as a result, the direction shown in FIG. 5B. The screen rotates.

  When fixing the holding plate 4, as shown in FIG. 8B, the eccentric pin is pulled out, and the fixing screw 50 is fastened from the upper part of the holding unit B 6 to fix the holding unit B 6 to the base portion 13. Further, the holding plate 4 is fixed to the base portion 13 by fastening the fixing bolt 21.

  In the present embodiment, since the holding unit B6 is fitted in the insertion groove 13a of the base portion 13, even when an external force such as vibration or impact is applied, the image output unit 3 is displaced, that is, the screen is distorted. There is no.

Embodiment 3 FIG.
9 shows a schematic configuration of the adjusting mechanism 130 according to the third embodiment of the present invention, FIG. 9A is a perspective view seen from the back side, and FIG. 9B is a partial configuration diagram seen in the Z direction. It is. As an adjusting mechanism in the θy direction, a pair of perpendicular bent portions 9 are provided on the lower surface of the holding plate 4, and ribs 17 projecting toward the holding plate are provided on the upper surface of the base portion 13, and the ribs 17 are sandwiched from both sides. A pair of set screws 60 and 61 are engaged with the bent portion 9 of the holding plate 4.

  When the set screw 60 or 61 is rotated with the tip of one of the set screws 60 and 61 in contact with the rib 17 and the other set back, the bent portion 9 of the holding plate 4 screwed with the set screw is rotated. Is displaced in the X direction. As a result, the holding plate 4 can be rotated in the θy direction around the pivot portion 15, and the video output unit 3 can also be rotated in the θy direction.

  After adjusting the optical axis of the video output unit 3, both ends of the set screws 60 and 61 are brought into contact with the ribs 17, whereby the displacement of the holding plate 4 in the θy direction is restricted and the locked state is obtained. At this time, it is preferable to add a nut to the set screws 60 and 61 and employ a lock mechanism using a double nut. Further, in order to reinforce this locked state, the holding plate 4 is completely fixed to the base portion 13 by fastening the fixing bolt 21 as shown in FIG.

  By providing such a lock mechanism, even if a large external force such as vibration or impact is applied after adjusting the optical axis of the video output unit 3, it is possible to reliably prevent occurrence of screen distortion without causing positional displacement.

  The rib 17 may be formed integrally with the base portion 13 or may be configured as a separate member. When the rib 17 is formed of a resin material or metal having low compressive strength, it is preferable to cover the rib 17 with a rib cover 62 such as a sheet metal in order to prevent deformation and wear due to contact of the set screw.

Embodiment 4 FIG.
FIG. 10 shows a schematic configuration of the adjustment mechanism 140 according to Embodiment 4 of the present invention, FIG. 10 (a) is a perspective view seen from the back side, and FIG. 10 (b) is a partially enlarged view. As an adjustment mechanism in the θy direction, a plurality of notches 70 are provided on the end surface along the X direction of the holding plate 4, and a block member 71 is provided on the upper surface of the base portion 13 so as to face the notches 70. The block member 71 is attached with a spring member 71 a that can be elastically engaged with the plurality of notches 70.

  The notches 70 are formed with periodic recesses on the end face of the holding plate 4 by arranging slits with very small widths at a predetermined pitch.

  In a state where the spring member 71a of the block member 71 enters the specific cutout portion 70, the displacement of the holding plate 4 in the θy direction is restricted by the repulsive force of the spring member 71a, and the holding plate 4 is positioned. When the holding plate 4 is rotated against the repulsive force of the spring member 71a, the spring member 71a moves to the adjacent notch 70, and the holding plate 4 is positioned again by the repulsive force of the spring member 71a. .

  In this way, the holding plate 4 can be positioned in units of the arrangement pitch of the notches 70, so that the optical axis adjustment operation is facilitated. As the arrangement pitch of the notches 70 is set smaller, the positioning resolution is improved. Further, as the repulsive force of the spring member 71a is increased, the positioning accuracy of the holding plate 4 is improved.

  After adjusting the optical axis of the video output unit 3, the holding plate 4 is completely fixed to the base portion 13 by fastening the fixing bolt 21, as shown in FIG.

  By providing such a lock mechanism, even if a large external force such as vibration or impact is applied after adjusting the optical axis of the video output unit 3, it is possible to reliably prevent occurrence of screen distortion without causing positional displacement.

Embodiment 5 FIG.
11A and 11B show a schematic configuration of an adjustment mechanism 150 according to Embodiment 5 of the present invention. FIG. 11A is a perspective view seen from the back side, and FIG. 11B is an exploded perspective view. As an adjustment mechanism in the θy direction, a hole in which the shaft of the eccentric cam 80 can be mounted is formed in the base portion 13, and a surface that contacts the cam surface of the eccentric cam 80 is provided in the holding plate 4.

  By rotating the eccentric cam 80 in a state where the shaft of the eccentric cam 80 is mounted in the hole of the base portion 13, the holding plate 4 can be rotated about the pivot portion 15 in the θy direction. 3 can also be rotated along the θy direction.

  The eccentric cam 80 is formed with an arc-shaped elongated hole, and the eccentric cam 80 can be fixed to the holding plate 4 by fastening a lock screw 81 through the elongated hole.

  After the optical axis adjustment of the video output unit 3, the rotation of the eccentric cam 80 is restricted by the fastening of the lock screw 81, and the locked state is obtained. Further, in order to reinforce this locked state, the holding plate 4 is completely fixed to the base portion 13 by fastening the fixing bolt 21 as shown in FIG.

  By providing such a lock mechanism, even if a large external force such as vibration or impact is applied after adjusting the optical axis of the video output unit 3, it is possible to reliably prevent occurrence of screen distortion without causing positional displacement.

Embodiment 6 FIG.
FIG. 12 is a cross-sectional view showing the internal configuration of the projection display apparatus according to Embodiment 6 of the present invention. The projection display device 200 includes a screen 1, a mirror 2, a video output unit 3, a housing 10 for housing these, and the like, similar to the projection display device 100 of FIG. It is configured to be directly attached to the base portion 13 without using 4 or the like.

  The screen 1 is attached to the front opening of the housing 10 using a screen holding unit 11 and is configured as a transmissive screen that emits light projected from the back side to display an image. The video output unit 3 is installed inside the housing 10 and projects an image such as a color or monochrome moving image or a still image. The mirror 2 is installed obliquely on the inner back surface of the housing 10 using the mirror holding unit 12 and reflects the projection light from the video output unit 3 toward the screen 1.

  A base portion 13 is provided as a part of the housing 10 at the bottom of the housing 10. The base portion 13 supports the video output unit 3 so as to be slidable along the ZX plane.

  13A and 13B show a schematic configuration of the adjusting mechanism 210 according to the present invention. FIG. 13A is a side view seen from the X direction, and FIG. 13B is a perspective view seen from the back side. A vertical bent portion is provided at the lower portion of the video output unit 3, and a boss hole is formed in the bent portion. On the other hand, a vertical wall surface is formed on the base portion 13 so as to face the bent portion of the video output unit 3, and a boss portion 14 is formed on the wall surface. When the boss portion 14 of the base portion 13 and the boss hole of the video output unit 3 are engaged, the height direction (Y direction) of the video output unit 3 is regulated.

  Further, similarly to the projection display device 100 described above, the base portion 13 is provided with a pivot portion 15 having a cylindrical surface having a generating line in the Y direction. The video output unit 3 is provided with a V-shaped notch. With the V-shaped notch of the video output unit 3 in contact with the cylindrical surface of the pivot portion 15, the video output unit 3 can rotate about the pivot portion 15 in the θy direction.

  The θy direction adjustment mechanism is not shown here, but the θy adjustment mechanism according to each of the above-described embodiments can be appropriately employed.

  The video output unit 3 is provided with another bent portion at a position away from the pivot portion 15, and a through-hole for inserting the fixing bolt 22 is formed in the bent portion. A block portion 18 is provided on the upper surface of the base portion 13 so as to face the bent portion, and a screw hole to be screwed with the fixing bolt 22 is formed.

  After adjusting the optical axis of the video output unit 3, the video output unit 3 is completely fixed to the base portion 13 by fastening the fixing bolts 22 as shown in FIG.

  By providing such a lock mechanism, even if a large external force such as vibration or impact is applied after adjusting the optical axis of the video output unit 3, it is possible to reliably prevent occurrence of screen distortion without causing positional displacement.

  Further, in this embodiment, since the video output unit 3 is directly fixed to the base portion 13, the number of parts interposed between the two is reduced, the assembly variation can be reduced, and due to external force due to vibration, impact, etc. There is less risk of misalignment and screen distortion.

It is sectional drawing which shows the internal structure of the projection display apparatus which concerns on Embodiment 1 of this invention. FIG. 2A is a side view seen from the X direction, and FIG. 2B is a perspective view seen from the back side, showing a schematic configuration of the adjusting mechanism 110 according to the present invention. FIG. 3A is an overall perspective view and FIG. 3B is an enlarged perspective view showing the operation of the holding unit A5. It is a perspective view which shows a mode that the image | video output unit 3 and the holding plate 4 rotate. 3 is an explanatory diagram showing a positional relationship between a reference frame 30 of a screen 1 and a projected image 31. FIG. FIG. 5 is a perspective view showing a lock mechanism of the holding plate 4. It is a perspective view which shows the attachment state of the reinforcement member of a lock mechanism. 8 shows a schematic configuration of an adjustment mechanism 120 according to Embodiment 2 of the present invention, FIG. 8A is a perspective view seen from the back side, FIG. 8B is an exploded perspective view, and FIG. 8C is a partially enlarged view. FIG. 9A and 9B show a schematic configuration of an adjustment mechanism 130 according to Embodiment 3 of the present invention, in which FIG. 9A is a perspective view viewed from the back side, and FIG. 9B is a partial configuration diagram viewed in the Z direction. 10 shows a schematic configuration of an adjustment mechanism 140 according to Embodiment 4 of the present invention, FIG. 10 (a) is a perspective view seen from the back side, and FIG. 10 (b) is a partially enlarged view. 11 shows a schematic configuration of an adjustment mechanism 150 according to Embodiment 5 of the present invention, FIG. 11 (a) is a perspective view seen from the back side, and FIG. 11 (b) is an exploded perspective view. It is sectional drawing which shows the internal structure of the projection display apparatus which concerns on Embodiment 6 of this invention. FIG. 13A is a side view seen from the X direction, and FIG. 13B is a perspective view seen from the back side, showing a schematic configuration of the adjusting mechanism 210 according to the present invention.

Explanation of symbols

1 screen, 2 mirror, 3 video output unit, 4 holding plate,
5 holding unit A, 6 holding unit B, 10 housing, 13 base part,
14 bosses, 15 pivots, 16 friction surfaces, 17 ribs,
Block part 18, 20 Eccentric pin, 21, 22 Fixing bolt,
40,42 Reinforced sheet metal, 41,43 Fixing screw, 60,61 Set screw,
62 rib cover, 70 notch, 71a spring member, 80 eccentric cam,
81 Lock screw, 100, 200 Projection display device.

Claims (4)

A video output unit for projecting an image;
A screen for displaying an image projected from the video output unit;
A holding plate for supporting the video output unit;
A projection display device comprising a base for supporting the holding plate,
The holding plate is provided with a pair of bent portions,
The base portion is provided with a rib on the holding plate side,
A projection display device , wherein a pair of screws that clamp the rib from both sides are screwed into a bent portion of the holding plate . The projection display device according to claim 1, wherein the pair of screws is provided with a lock mechanism using a double nut. The projection display device according to claim 1, wherein a rib cover is interposed between the pair of screws and the rib. The projection display device according to claim 1, wherein the holding plate is fixed to the base portion using a fixing bolt.

Images