JPH11153760A - Reflecting mirror adjusting mechanism and projection type display device using the mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a projection type display device to correct the contour distortion of display area of video projected on a screen unit due to the aberration of an optical lens. SOLUTION: Rubber 19 is charged among a frame-form base plate 14 and fastening plates 11, 12, 13 arranged along the base plate, and a projecting mirror 8 is held by the peripheral part inserted in the rubber 19. Moreover, the peripheral part of the base plate 14 is fixed to the reflecting mirror frame at a predetermined interval. By turning push-adjusting volts 15 arranged so that they engage the screw holes in the reflecting mirror frame 5 and their tip parts are abutted on the base plate 14, the base plate 14, etc., are deformed and the reflecting mirror 8 is deformed in a concave form to the reflecting mirror frame 5, and by turning the lead-in adjusting bolts 16 passing through the through-holes in the reflecting mirror frame 5 and engaging the screw holes in the base plate 14, the base plate 14, etc., are deformed and the reflecting mirror 8 is deformed projectingly to the reflecting mirror frame 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflecting mirror adjusting mechanism for holding a reflecting mirror for changing the optical path of image light, and a projection display device using the same.

[0002]

2. Description of the Related Art As a conventional projection type display device, there has been known a display device in which a liquid crystal panel is used as a projection unit and a projected image of the liquid crystal panel is enlarged and projected on a screen unit to obtain a large screen. At this time, the light source of the liquid crystal panel is enlarged to increase the luminance so that a clear projected image can be seen even in a bright place.

However, when the size of the light source of the liquid crystal panel is increased as described above, the temperature inside the housing of the projection display apparatus increases, and the life of the internal components such as the liquid crystal panel is shortened. , A cooling function provided by a blower inside the housing to cool the inside of the housing,
For example, as disclosed in Japanese Patent Application Laid-Open No. 5-257113, a ventilation window having a shutter that can be opened and closed is provided in a housing, and the shutter is controlled according to the temperature inside the housing and the illuminance outside the housing. , The heat inside the housing is released to the outside from the ventilation window, and dust accumulates in the optical elements inside the housing due to the use environment or long-term use, and the dust is reflected on the image, deteriorating the image quality For this reason, a device provided with a device for preventing dust adhering to such an optical element is known.

[0004]

However, the above-mentioned Japanese Patent Application Laid-Open
As in the conventional example described in Japanese Patent Application Laid-Open No. 257113, a device provided with a cooling function and a dustproof function of the device is known, but the contour of the display area of the projected image on the screen due to the aberration of the optical lens is known. No consideration is given to distortion, which causes a problem that the quality of the projected image is deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reflector adjusting mechanism for a projection display device which can solve such a problem and prevent the deterioration of the quality of a projected image due to the aberration of the optical lens. It is in.

[0006]

In order to achieve the above object, a reflector adjustment mechanism according to the present invention enables the flatness of a reflector to be adjusted, and adjusts the optical path length of image light reflected by the reflector. To be able to make targeted or continuous changes.

Further, in the reflector adjusting mechanism according to the present invention, the peripheral edge of the reflector is supported by a viscoelastic member, a viscoelastic member and an elastic member, or only by an elastic member.

Further, the reflecting mirror adjusting mechanism according to the present invention is
A peripheral portion of the reflector is rotatably supported by a rotation axis in a direction parallel to an outer edge of the reflector and a rotation axis in a direction perpendicular to the outer edge of the reflector.

[0009] Further, the reflecting mirror adjusting mechanism according to the present invention,
By providing a screw and elastic means on the member holding the reflector and the reflector frame, by rotating the screw,
The reflecting mirror and the reflecting mirror frame are displaced.

Further, the reflecting mirror adjusting mechanism according to the present invention is
By rotating the screw to displace the reflecting mirror and the reflecting mirror frame, the optical path length of the image light reflected by the reflecting mirror can be partially changed.

Further, the reflecting mirror adjusting mechanism according to the present invention comprises:
The reflecting mirror is configured such that its flatness can be changed by its own weight or screw means.

In order to achieve the above object, a projection display apparatus according to the present invention reflects image light from a projection unit to irradiate the screen unit with a light, and projects an image projected by the projection unit onto the screen. The mirror is provided with the reflecting mirror adjusting mechanism so that the flatness of the light beam of the projected image on the screen unit can be corrected.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a first embodiment of a reflector adjusting mechanism according to the present invention and an embodiment of a projection display device using the same. 2, a projection unit, 3 a screen unit, 4 a cabinet (housing), 5 a reflector frame, 6 an upper support plate,
7 is a lower support plate, 8 is a reflecting mirror, 9a, 9b and 10 are screws.

Referring to FIG. 1, a projection unit 2 is fixedly disposed obliquely upward at a lower portion of a cabinet 4, and a reflection unit 1 is disposed obliquely downward at an upper rear surface.
Further, the screen units 3 are vertically fixedly arranged on the front surface on the upper side. Here, it is assumed that the projection unit 2 uses a liquid crystal panel. Light emitted from the projection unit that projects an image (L is the optical axis of the main light beam) is reflected by the reflecting mirror of the reflecting unit 1 and radiated to the screen unit 3, whereby the projection unit 2 is projected.
Is enlarged and projected on the screen unit 3, and a large screen of the projected image is obtained.

Here, in the reflecting mirror unit 1, the reflecting mirror 8
Is held by a frame-shaped reflector frame 5 at the periphery thereof, the upper part of the reflector frame 5 is fixed to the upper support plate 6 by screws 9a, and the lower part is screws 9b.
The lower support plate 7 is fixed to the lower support plate 7 by screws 10, and the upper support plate 6 is attached to the inner back surface of the cabinet 4 by screws 10. (Not shown). As a result, the reflecting mirror unit 1 has a configuration provided on the inner rear side of the cabinet 4.

FIG. 2 is a plan view showing one side of the reflecting mirror unit 1 viewed from the direction of arrow B in FIG.
Reference numeral 11 denotes an upper stopper, 12 denotes a lower stopper, 13 denotes a side stopper, and 14 denotes a base. The same reference numerals are given to portions corresponding to those in FIG.

In FIG. 1, on the back side of the reflecting mirror 8, there is provided an elongated upper stopper 11 having a cross section bent stepwise in two steps along the upper edge thereof, and along the side edge thereof. And a lower stopper 12 of the same shape along its lower edge, and a front side of the reflector 8 is provided with an edge thereof. A frame-shaped base fitting 14 is arranged over the entire periphery of the portion. That is, the upper peripheral portion of the reflecting mirror 8 is disposed between the base fitting 14 and the upper stopper 11, the side peripheral portion of the reflecting mirror 8 is disposed between the base fitting 14 and the side stopper 13, The lower peripheral portion of the reflecting mirror 8 is arranged between the base metal fitting 14 and the lower metal fitting 12. The front surface of the reflector frame 5 is arranged on the front side of the base fitting 14.

FIG. 3 is an enlarged sectional view showing portions A, B and C of the reflecting mirror unit 1 in FIG. 1, and FIG.
FIG. 14 is a cross-sectional view taken along the line D-D in FIG.
5 'is a push-in adjustment bolt, 16 and 16' are pull-in adjustment bolts, 17 and 17 'are stud bolts, 18 and 18' are fixing screws, 19 and 19 'are viscoelastic bodies, and 20 and 20' are elastic bodies. The same reference numerals are given to the portions corresponding to the above-mentioned drawings, and the overlapping description will be omitted.

In FIG. 3, in the portions A and C, the upper metal fitting 11, the lower metal fitting 12 and the base metal 14 are integrally fixed by fixing screws 18, thereby forming a concave portion having a U-shaped cross section. ing. The open sides of these recesses in the sections A and C face each other, and the peripheral edges (here, the upper edge and the lower edge) of the reflecting mirror 8 are inserted into these recesses. Also, the upper stopper 11 (lower stopper 1)
2) An elastic member 20 such as a compression spring is provided between the base member 14 and the reflecting mirror 8 inside the concave portion formed by the base member 14 and the concave portion except for the elastic member 20. Is filled with a rubber viscoelastic body 19. That is, the peripheral edge of the reflecting mirror 8 is pushed into the viscoelastic body 19 filled in the recess. Thus, in the recess, the peripheral edge of the reflecting mirror 8 is held by the balance of the elastic force between the elastic body 20 and the viscoelastic body 19 around the peripheral edge.

A stud bolt 17 is fixed to the center of each side of the frame-shaped base member 14, and each of the stud bolts 17 is connected to the upper stopper member 11 and the side stopper member facing the base member 14. 13. Lower bracket 1
2 through which the nuts are screwed into the spiral grooves of the stud bolts 17 to hold down the surfaces of the upper stoppers 11, the side stoppers 13, and the lower stoppers 12, so that the base fittings 14 The distance between the upper stopper 11, the side stopper 13, and the lower stopper 12 is maintained at a predetermined value.

As shown in FIG. 4, the same applies to the side edges of the reflecting mirror 8, and the viscoelastic body 19 'and the compression spring 2 are formed in a recess formed by the base fitting 14 and the side fitting 13.
0 '. In FIG. 4, those having the same functions as those in FIG. 3 are indicated by the same numbers with dashes.

In FIG. 3, the reflector frame 5 is provided with a plurality of bolt holes at each of the plurality of positions.
5 is screwed. And these push adjustment bolts 15
Of the base fitting 14 is in contact with the surface of the base fitting 14. By rotating the push adjustment bolt 15,
The base metal fitting 14 with respect to the reflector frame 5 and, accordingly,
The reflecting mirror 8 can be pushed in (that is, the reflecting mirror 8 can be displaced away from the reflecting mirror frame 5), but the pushing amount is within a range in which the reflecting mirror 8 can be elastically deformed. , So that it can be pushed in by the thickness of the plate.

Further, through-holes are provided in a plurality of other portions of the reflector frame 5, and the base fitting 1 is opposed to the through-holes.
4 is provided with a bolt hole penetrating therethrough. Then, the pull-in adjusting bolts 16 are provided so as to be screwed into the opposed bolt holes of the base fitting 14 through these through holes. By rotating the pull-in adjustment bolt 16, the base fitting 14 is pulled into the reflector frame 5 side, and the reflector 8 can be pulled into the reflector frame 5 side.

FIG. 3 shows the portion of the reflector frame 5 where the side stoppers 13 are provided in FIG. 2, but the portion of the reflector frame 5 where the upper stoppers 11 and 12 are provided is also shown. As shown in FIG. 4, the configuration is the same as that described above.

With the above configuration, the reflecting mirror 8 has its base portion supported by the viscoelastic body 19 and the elastic body 20 as a rotation end, and can be displaced by operating the push-in adjustment bolt 15 and the pull-in adjustment bolt 16. The fitting 14 is the reflector frame 5
It will be supported by. Here, the peripheral edge of the reflecting mirror 8 is supported by the viscoelastic body 19 and the elastic body 20, but may be supported by the viscoelastic body 19 alone. However, when not only the viscoelastic body 19 but also the compression coil spring 20 is used as the reflecting mirror 8, the peripheral edge of the reflecting mirror 8 is supported more like a rotating end. The amount of displacement of the reflecting mirror 8 is absorbed by the amount of elastic deformation of the reflecting mirror frame 5 and the base fitting 14, and the respective adjusting bolts 15,
Needless to say, the displacement amount is smaller than the amount of displacement of 16.

Next, a method of adjusting the reflecting mirror unit 1 having the above configuration will be described.

FIG. 5 shows an adjustment method in the case where a concave bend occurs in the left edge of the display area of the projected image on the screen unit 3, and FIG. It is sectional drawing which shows the part of B and C part, and attaches | subjects the same code | symbol to the part corresponding to the above-mentioned drawing. FIG.
(B) shows the left edge of the display area, where DE is the display area of the projected image, and (c) and (d) show the left edge of the display area DE, respectively.

Now, as shown as (c) in FIG. 5 (b), it is assumed that the side edge of the display area DE in the screen unit 3 has a curved shape such that it is concave at the center. Here, the concave curve (C) is caused by the fact that the optical path of the light from the projection unit 2 at the center is longer than the optical path of the light at the end of the side edge of the display area. Shall be.

In this case, the optical path of the light from the projection unit 2 at the center of the side edge of the display area may be shortened.

Therefore, as shown in FIG. 5A, the push-in adjustment bolt 15 is pulled out so as not to act, and the pull-in adjustment bolt 16 is operated to pull the base fitting 14 toward the reflecting mirror frame 5 side. I do. As a result, the base fitting 14 is elastically deformed in a convex shape toward the reflector frame 5 side. Due to the deformation of the base fitting 14, the side stopper 13 also undergoes the same elastic deformation, and the reflecting mirror 8 whose peripheral portion is held thereby also undergoes the same elastic deformation. The peripheral edge of the base metal fitting 14 is kept at a constant distance from the reflector frame 5 by a fixing screw 18. By this adjustment, as is apparent from FIG. 1, the distance to the screen unit 3 becomes shorter as the displacement amount of the reflecting mirror 8 due to the deformation becomes larger. Therefore, in this portion, the reflecting mirror 8 is moved from the projection unit 2 to the screen unit 3. The projection distance to the screen unit 3 via this becomes shorter. As a result, the display area DE shown in FIG.
5C is corrected for the concave bending (c) at the side edge of FIG.
(D), the side edge of the display area DE becomes linear.

In this manner, concave bending at the right and left edges of the display area DE can be corrected.

FIG. 6 shows an adjustment method in the case where a concave bend occurs in the upper edge of the display area of the projected image on the screen unit 3, and FIG. 6 (a) is the same as FIG. It is sectional drawing of the reflecting mirror unit 1 seen from the direction, and the same code | symbol is attached | subjected to the part corresponding to the above-mentioned drawing. Also,
FIG. 6B shows the upper edge of this display area, where DE is the display area of the projected image, and (G) and (H).
Indicates the upper edge of the display area DE.

In this case as well, it is assumed that the upper edge (g) of the display area DE is concave as shown in FIG. 6 (b). As in the case, it is assumed that the optical path of the light from the projection unit 2 at the center is longer than the optical path of the light at the upper edge of the display area.

In this case, the reflecting mirror 8 is made to project toward the reflecting mirror frame 5 by operating the pull-in adjustment bolt 16 ′ provided along the upper fastener 11. Thereby, as shown as (h) in FIG. 6B, the upper edge of the display area DE becomes linear.

Similarly, the lower edge of the display area DE can be made linear by operating the pull-in adjustment bolt on the lower fastener 12 side.

FIG. 7 shows an adjustment method when a convex bend occurs on the left edge of the display area of the projected image on the screen unit 3, and FIG. 7A shows A in FIG. , B, and C, and FIG. 7B shows a left edge portion of the display area, and portions corresponding to the above-mentioned drawings are denoted by the same reference numerals.

Now, as shown as (e) in FIG. 7 (b), it is assumed that the left edge of the display area DE in the screen unit 3 has a curved shape such that it is concave at the center. It is assumed that the curve (e) is caused by the fact that the optical path of the light from the projection unit 2 at the center is shorter than the optical path of the light at the end of the side edge of the display area.

In this case, the optical path of the light from the projection unit 2 at the center of the side edge of the display area may be lengthened.

Therefore, as shown in FIG. 7 (a), the pull-in adjustment bolt 16 is pulled out from the bolt hole of the base fitting 14 so as not to act, and the push-in adjustment bolt 15 is operated to move the base fitting 14 to the reflecting mirror. Keep it further away from frame 5. As a result, the base fitting 14 is elastically deformed concavely toward the reflector frame 5 side. Due to the deformation of the base fitting 14, the side stopper 13 also undergoes the same elastic deformation, and the reflecting mirror 8 whose peripheral portion is held thereby also undergoes the same elastic deformation.

With this adjustment, the larger the amount of displacement of the reflecting mirror 8 due to the deformation, the larger the screen unit 3 is.
Therefore, in this part, the projection distance from the projection unit 2 to the screen unit 3 via the reflecting mirror 8 is increased. As a result, the convex bending (e) at the left edge of the display area DE shown in FIG. 7B is corrected, and as shown at (f) in FIG. Be linear.

The same applies to the right edge of the display area DE. In this manner, the concave bending of the right and left edges of the display area DE can be corrected.

FIG. 8 shows an adjustment method when a convex bend occurs at the upper edge of the display area of the projected image on the screen unit 3, and FIG. 8 (a) is the same as FIG. 8 is a sectional view of the reflecting mirror unit 1 viewed from the direction of FIG.
(B) shows an upper edge portion of the display area, and portions corresponding to the above-mentioned drawings are denoted by the same reference numerals.

Also in this case, as shown in FIG. 8B, the upper edge (i) of the display area DE is assumed to be convex. As in the case of, it is assumed that the optical path of the light from the projection unit 2 at the center is shorter than the optical path of the light at the upper edge of the display area.

In this case, the reflecting mirror 8 is made concave toward the reflecting mirror frame 5 by operating the pull-in adjustment bolt 16 ′ provided along the upper fastener 11. As a result, the upper edge of the display area DE becomes linear, as indicated by (nu) in FIG. 8B.

Similarly, the lower edge of the display area DE can be made linear by operating the pull-in adjustment bolt on the lower fastener 12 side.

Next, a description will be given of a method of adjusting the reflector unit 1 when the above embodiment is applied to a multi-vision (combination type projection display device). In addition, here, a four-screen multi-vision which combines four screen units to form a large screen is taken as an example.
It is not limited to this.

As described above, the distortion of the outline of the display area DE can be corrected to form a rectangular display area.

In the above contour correction, for example, the reason why the edge of the display area DE is distorted in a concave shape as shown in FIG.
Although the light path of the light from the projection unit 2 at the center is longer than the light path of the light at the end of the left edge of the left side, the light path may be shorter. In such a case, instead of the method shown in FIG. 5A, the push-in adjustment bolt 15 may be adjusted in the direction in which the reflecting mirror 8 moves away from the reflecting mirror frame 5 as described with reference to FIG. . The same applies to other edges of the display area DE.

FIG. 9 is a front view showing a screen of such a four-sided multi-vision, in which 21 is a multi-vision, 22 is a multi-screen, and 23 is a single screen.

Referring to FIG.
Is a screen unit (that is, a screen unit) 23
Have a multi-screen 22 arranged and combined two vertically and two horizontally. In this case, the individual screens 23 are arranged such that the front faces are adjacent to each other, and the edges of the adjacent screens are joined together to form one multi-screen 22.

The screen unit 23 is provided with the projection unit 2 and the reflector unit 1 shown in FIG. 1 for each screen unit 23. Therefore, each screen unit 23 has a projected image of a different projection unit corresponding to each screen unit 23. Is projected.

FIG. 10 is a cross-sectional view taken along the line EE in FIG. 9, and FIG. 11 is a cross-sectional view taken along the line FF in FIG. Thus, parts corresponding to those in FIG. 1 are denoted by the same reference numerals.

In FIG. 9, each screen 2
Assuming that the contour of the display area DE formed by 3 is distorted by being concave or convex as shown by a broken line, particularly, the projected images of these four screens 23 are combined. Thus, when one image is displayed, the boundary of the display area DE is conspicuous between the adjacent screen products 23, and the quality of the image is degraded. However, this 4
In the surface multi-vision, in such a case, the distortion of the contour of the display area DE can be corrected by the above-described adjustment in the reflecting mirror unit 1 for each screen unit 23.

Hereinafter, a method of correcting the irregularity of the contour of the display area DE will be described.

In FIGS. 10 and 11, by setting the positions of the projection unit 2 in the X, Y, and Z directions with respect to the reference position of the cabinet 4 in advance, the image projected by the projection unit 2 is displayed on the screen unit 3. The size and focus direction of the projected image are adjusted, and the outline of the display area DE on the screen unit 3 is adjusted to be a rectangle.

Now, as shown in FIG. 9, it is assumed that the screen 23 disposed at the upper left is distorted so as to be depressed in the vertical and horizontal outlines of the outline of the display area DE. Here, assuming that the screen unit 23 is a portion including the projection unit 2a, the reflecting mirror unit 1a and the screen unit 3a in FIG. 10, the reflecting mirror 8a at this time is assumed.
Is at the position indicated by the two-dot chain line. The projection unit 2
b, the reflector unit 1b and the screen unit 3b are portions of the screen unit 23 arranged at the lower left in FIG.

The reason why the upper and lower edges of the display area DE are distorted is that the upper and lower solid lines LU1 and LD1 from the reflecting mirror 8a to the screen unit 3a correspond to the upper and lower left and upper sides in the upper left display area DE in FIG. At the corners S ₁ and S ₂ , and the upper and lower two-dot chain lines LU2 and LD2 from the reflecting mirror 8a to the screen unit 3a are the light at the center of the upper and lower edges in the upper left display area DE in FIG. In this case, as shown in the figure, for example, a light beam indicated by a two-dot chain line LU2 is reflected by a reflecting mirror 8a with respect to a light beam indicated by an upper solid line LU1.
This is because the light ray indicated by the two-dot chain line LD2 is reflected on the upper side (center side of the reflecting mirror 8a) with respect to the light ray indicated by the solid line LD1 on the lower side. If the upper solid line LU1 and the light beam indicated by the two-dot chain line LU2 do not reflect at the same height, the upper edge of the upper left display area DE in FIG. 9 is bent in a concave shape, and the lower solid line LD1 and the lower solid line LD1 are not reflected. If the light beam indicated by the chain line LD2 is not reflected at the same height, the lower edge of the upper left display area DE in FIG. 9 bends concavely.

Therefore, in the reflection unit 1a, FIG.
And the reflection mirror unit 1a adjusted as described in FIG.
The reflecting mirror 8 is displaced by adjusting screws 15 and 16 by adjusting screws 15 and 16 at the center of the upper edge to the rear by ΔU1 and the middle of the lower edge by ΔD1 to reflect the light indicated by the two-dot chain line LU2 and the light indicated by the solid line LU1. The light can be reflected at the same height of the mirror 8a, and the light beam indicated by the two-dot chain line LU2 and the light beam indicated by the solid line LU1 can be reflected.
The light can be reflected at the same height position of a, so that the concave distortion can be eliminated, and the contour of the upper and lower edges of the display area DE becomes straight.

In FIG. 11, left and right solid lines LL1 and LR1 extending from the reflecting mirror 8a to the screen unit 3a.
Are the light beams at the left and right corners S ₁ , S ₃ in the display area DE of the upper left screen unit 23 in FIG.
a two-dot chain line L from left to right to the screen unit 3a
When L2 and LR2 are light rays at the center of the left and right edges in the upper left display area DE in FIG. 9, for example, as shown in the drawing, the light ray indicated by the solid line LL1 on the left is indicated by a two-dot chain line LL2. The light ray is reflected on the right side (center side) of the reflecting mirror 8a, and the light ray indicated by the two-dot chain line LR2 is reflected on the left side (center side of the reflecting mirror 8a) with respect to the light ray indicated by the solid line LR1 on the right side. In the upper left display area shown in FIG. 9, the left and right side edges are bent in a concave shape. The portions 1c and 3c correspond to the screen unit 2 arranged at the upper right in FIG.
It is part 3 of FIG.

Therefore, the adjustment is performed in the reflector unit 1a as described with reference to FIG.
a center part of the left and right side edges of a
By displacing the reflecting mirror 8 by 5 'and 16', the contour of the left and right side edges of the display area DE can be made straight.

As described above, the contour of the upper left display area DE in FIG. 9 can be made a rectangular shape without distortion.

Similarly, the outline of the display area DE can be made into a rectangular shape without distortion for each screen unit 23 in FIG. 9, and the position, size, orientation, etc. of each display area are as described above. As can be adjusted by the projection unit as shown in FIG.
Can be connected with high precision, and a large screen can be formed in which the joints are not noticeable.

As shown in FIG. 1, in a state where the reflecting mirror unit 1 is mounted in the cabinet 4, the reflecting mirror 8 and each metal fitting 11 mounted on the reflecting mirror frame 5 are provided.
The holding member of the reflector consisting of
As shown in FIG. 6 and FIG. 6, when the reflector is deformed in a convex shape toward the reflector frame 5, the pull-in adjustment bolt 16 is omitted, and the partial displacement of the reflector 8 is adjusted only by the push-in adjustment bolt. You can do so.

FIG. 12 is a front view showing a second embodiment of the reflector adjusting mechanism of the projection display apparatus according to the present invention.
0 is a reflecting mirror unit of this embodiment, 31 is a support plate, 3
2 is a reflector frame, 33 is a fixing bracket, 34 is an L-shaped bracket, 35a and 35b are rotating shafts, 36 is an adjusting screw, and 37 is a reflecting mirror.

Parts corresponding to those in FIG. 12 are denoted by the same reference numerals.

In the same figure, the reflecting mirror unit 30 of this embodiment is such that a rectangular reflecting mirror 37 is
, And is attached to the frame-shaped support plate 31 by adjusting screws 36 at the center of each side of the reflector frame 32.

Further, at the four corners of the reflecting mirror frame 32, rotating shafts 35b are provided.
A fixture having a rotating shaft 35a is fixedly attached near each of 5b. Then, the respective rotating shafts 35
a and the rotating shaft 35b in the vicinity thereof are connected by an L-shaped bracket.

FIG. 13 is a sectional view taken along the line GG in FIG. 12, in which 38 is a nut, 39 is a supporting spring,
Is a viscoelastic body such as rubber, and the portions corresponding to FIG.

In the figure, the reflecting mirror frame 32 has a U-shaped frame whose inner side is open, and a viscoelastic body 40 is filled in the cross section. The edge of is sunk. That is, the reflection mirror 37
The peripheral portion of the reflective frame 3
2 is held.

The reflector frame 32 is attached to the support plate 31 by adjusting screws 36 and nuts 38 with a support spring 39 interposed therebetween. Therefore, by rotating the adjusting screw 36, the distance between the reflector frame 32 and the support plate 31 at that portion can be changed. A predetermined gap S is provided between a through hole provided in communication with the reflector frame 32 and the viscoelastic body 40 and an adjustment screw 36 inserted therein.

FIG. 14 is an enlarged sectional view of a portion H in FIG. 12. Reference numerals 41a and 41b denote E-rings, reference numeral 42 denotes a fixing screw, and portions corresponding to those in FIG.

In the same figure, the fixing bracket 33 has a fixing screw 4
The rotation shaft 35 a protrudes from the fixing bracket 33 in parallel with the surface of the support plate 31 and the side surface of the reflector frame 32. The rotation axis 35b near the rotation axis 35a is
Of the rotating shaft 3
It is orthogonal to 5a.

The L-shaped bracket 34 has two sides that are orthogonal to each other are integrated, and one of the sides is inserted into the through-hole provided therein so that the rotation shaft 35a is inserted into the rotation shaft 35a. It is rotatably mounted and has an L-shaped bracket 3
The other side of the rotary shaft 3 has a through-hole provided therein.
By inserting 5b, it is rotatably attached to this rotating shaft 35b. It is to be noted that the L-shaped bracket 34 is not disengaged from the rotating shafts 35a and 35b so that the rotating shaft 35
E-rings 41a and 41b are attached to a and 35b, respectively.

With this configuration, the reflector frame 32
Can rotate about the rotation shaft 35a, and can also rotate about the rotation shaft 35b. Then, as shown in FIG. 12, the rotating shafts 35a, 35b
Are provided at each of the four corners of the reflector frame 32, so that the reflector frame 32
It can rotate around 5a, 35b.

Now, the right side of the reflector frame 32 in FIG. 12 will be described as an example. In FIG. 13, the turning operation of the adjusting screw 36 causes the reflector frame 32 and the support plate at the center of the right side. 12, the upper right corner and the upper left corner of the reflector frame 32 in FIG. 12 rotate around the rotation shaft 35a.

For example, if the center of the right side of the reflector frame 32 is lifted with respect to the support plate 31 by adjusting the adjusting screw 36, and the interval between them becomes large,
At the upper right corner of the support plate 31, the upper right corner of the reflector frame 32 rotates counterclockwise as viewed from the arrow X direction, and at the lower right corner of the support plate 31, the lower right corner of the reflector frame 32 It turns clockwise as viewed from the arrow X direction. Conversely, by adjusting the adjusting screw 36, the reflecting mirror frame 3
When the distance between the center of the right side of 2 and the support plate 31 becomes smaller, the upper right corner of the reflector frame 32 rotates clockwise in the upper right corner of the support plate 31 when viewed from the arrow X direction,
At the lower right corner of the support plate 31, the lower right corner of the reflector frame 32 rotates counterclockwise as viewed from the arrow X direction.

In this manner, by adjusting the adjusting screw 36, the right side of the reflector frame 32, and thus the right side of the reflector 37, can be elastically deformed into a convex shape or a concave shape. Regarding the left side of the reflector 37,
By adjusting the adjusting screw 36, similar elastic deformation can be obtained.

Also, the upper side of the reflector frame 32 in FIG. 12 is rotated by operating the adjusting screw 36 at the center thereof, so that the distance between the reflector frame 32 and the support plate 31 at the center of the upper side is increased. Changes, and with this change,
The upper left corner and the upper right corner of the reflector frame 32 in FIG. 12 rotate around the rotation shaft 35b.

For example, if the center of the upper side of the reflector frame 32 is lifted with respect to the support plate 31 by adjusting the adjusting screw 36, and the interval between them is increased,
At the upper left corner of the support plate 31, the upper left corner of the reflector frame 32 rotates clockwise as viewed from the direction of the arrow Y. At the upper right corner of the support plate 31, the upper right corner of the reflector frame 32 is an arrow. It rotates counterclockwise as viewed from the Y direction. Conversely, when the distance between the center of the upper side of the reflector frame 32 and the support plate 31 is reduced by the rotation operation of the adjusting screw 36, the upper left corner of the support plate 31
2 rotates counterclockwise when viewed from the arrow Y direction, and the upper right corner of the support plate 31
Is rotated clockwise as viewed from the arrow Y direction.

In this way, by adjusting the adjusting screw 36, the upper side of the reflector frame 32, and thus the upper side of the reflector 37, can be elastically deformed into a convex or concave shape. Regarding the lower side of the reflecting mirror 37,
By adjusting the adjusting screw 36, similar elastic deformation can be obtained.

The reflecting mirror unit 30 of the second embodiment
Can be used instead of the reflector unit 1 in FIG. In this case, as described above, in the second embodiment in which the central portions of the reflecting mirror frame 32 and the reflecting mirror 37 are moved, the reflecting mirror frame 14 and the reflecting mirror frame 14 are moved as in the first embodiment described above. The reflecting mirror is more likely to be displaced approximately four times as compared with the case where the four sides are fixed. Therefore, it is possible to correct the distortion of the outline of the display area DE in the screen unit 3 with higher accuracy.

FIG. 15 is a sectional view showing a third embodiment of a reflecting mirror adjusting mechanism according to the present invention and an embodiment of a projection display device using the same, and portions corresponding to FIG. 1 are the same. The sign is attached.

In the above embodiment, the adjusting bolt is provided on the reflecting surface side of the reflecting mirror 8 and is adjusted from the reflecting surface side. However, in the third embodiment, the adjusting bolt is used. Is provided on the back side of the reflecting mirror so that adjustment can be made from this back side. For this reason, adjustment becomes easier without affecting the projected image.

In the same figure, a projection unit 2 is fixedly disposed obliquely upward at a lower portion of a cabinet 4, and a reflection unit 1 is obliquely downwardly disposed at an upper rear side.
Further, the screen units 3 are vertically fixedly arranged on the front surface on the upper side. Here, it is assumed that the projection unit 2 uses a liquid crystal panel. Light emitted from the projection unit 2 for projecting an image (L is the optical axis of the main light beam) is reflected by the reflection mirror 8 of the reflection unit 1 and radiated to the screen unit 3. The projected image is enlarged and projected on the screen unit 3, and a large screen of the projected image is obtained.

Here, in the reflecting mirror unit 1, the reflecting mirror 8
Is held by a frame-shaped reflector frame 5 at the periphery thereof, the upper part of the reflector frame 5 is fixed to the upper support plate 6 by screws 9a, and the lower part is screws 9b.
The lower support plate 7 is fixed to the lower support plate 7 by screws 10, and the upper support plate 6 is attached to the inner back surface of the cabinet 4 by screws 10. (Not shown). As a result, the reflecting mirror unit 1 has a configuration provided on the inner rear side of the cabinet 4.

FIG. 16 is a plan view showing one side portion of the reflecting mirror unit 1 as viewed in the direction of the arrow in FIG. 15, wherein 11 is an upper stopper, 12 is a lower stopper, and 13 is a side stopper. , 14 are base fittings, and portions corresponding to those in FIG. 15 are denoted by the same reference numerals, and redundant description is omitted.

In the same figure, on the back side of the reflecting mirror 8, there is provided an elongated upper stopper 11 having a cross section bent in two steps along the upper edge thereof, and along the side edge thereof. And a lower stopper 12 of the same shape along its lower edge, and a front side of the reflector 8 is provided with an edge thereof. A frame-shaped base fitting 14 is arranged over the entire periphery of the portion. That is, the upper peripheral portion of the reflecting mirror 8 is disposed between the base fitting 14 and the upper stopper 11, the side peripheral portion of the reflecting mirror 8 is disposed between the base fitting 14 and the side stopper 13, The lower peripheral portion of the reflecting mirror 8 is arranged between the base metal fitting 14 and the lower metal fitting 12. The front surface of the reflector frame 5 is arranged on the front side of the base fitting 14.

FIG. 17 shows the reflecting mirror unit 1 shown in FIG.
FIG. 18 is an enlarged cross-sectional view of the H, i, and j portions of FIG.
5, 15 'are push-in adjusting bolts, 16 and 16' are retract-adjusting bolts, 17, 17 'are stud bolts, 18, 1
8 'is a fixing screw, 19, 19' is a viscoelastic body, 20, 2
Numeral 0 'denotes an elastic body, and portions corresponding to the above-mentioned drawings are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 17, in the H and J portions, the upper metal fitting 11, the lower metal fitting 12 and the base metal 14 are integrally fixed by a fixing screw 18, thereby forming a concave portion having a U-shaped cross section. ing. The open sides of these concave portions in the H and J portions are opposed to each other, and the peripheral edges (here, the upper edge portion and the lower edge portion) of the reflecting mirror 8 are inserted into these concave portions. Also, the upper stopper 11 (lower stopper 1)
2) An elastic member 20 such as a compression spring is provided between the base member 14 and the reflecting mirror 8 inside the concave portion formed by the base metal member 14 and the concave member except for the elastic member 20. Is filled with a rubber viscoelastic body 19. That is, the peripheral edge of the reflecting mirror 8 is pushed into the viscoelastic body 19 filled in the recess. Thus, in the recess, the peripheral edge of the reflecting mirror 8 is held by the balance of the elastic force between the elastic body 20 and the viscoelastic body 19 around the peripheral edge.

A stud bolt 17 is fixed to the center of each side of the frame-shaped base fitting 14, and these stud bolts 17 are respectively connected to the upper stopper 11 and the side stoppers facing the base 14. 13. Lower bracket 1
2 through which the nuts are screwed into the spiral grooves of the stud bolts 17 to hold down the surfaces of the upper stoppers 11, the side stoppers 13, and the lower stoppers 12, so that the base fittings 14 The distance between the upper stopper 11, the side stopper 13, and the lower stopper 12 is maintained at a predetermined value.

Also, as shown in FIG. 18, the same applies to the side edges of the reflecting mirror 8, and a viscoelastic body 19 'and a compression spring 20' are formed in a recess formed by the base fitting 14 and the side fitting 13. And held by. In FIG. 18, those having the same functions as those in FIG. 17 are indicated by the same numbers with dashes.

In FIG. 17, the reflecting mirror frame 5 includes
Bolt holes are provided at a plurality of locations, and each of the push adjustment bolts 15 is screwed. And these pushing adjustment bolts 1
The tip of 5 is in contact with the surface of the base fitting 14. By rotating the push adjustment bolt 15,
The base metal fitting 14 with respect to the reflector frame 5 and, accordingly,
The reflecting mirror 8 can be pushed in (that is, the reflecting mirror 8 can be displaced away from the reflecting mirror frame 5), but the pushing amount is within a range in which the reflecting mirror 8 can be elastically deformed. , So that it can be pushed in by the thickness of the plate.

Further, through-holes are provided in a plurality of other portions of the reflector frame 5, and the base fitting 1 is opposed to the through-holes.
4 is provided with a bolt hole penetrating therethrough. Then, the pull-in adjusting bolts 16 are provided so as to be screwed into the opposed bolt holes of the base fitting 14 through these through holes. By rotating the pull-in adjustment bolt 16, the base fitting 14 is pulled into the reflector frame 5 side, and the reflector 8 can be pulled into the reflector frame 5 side.

FIG. 17 shows a portion of the reflector frame 5 where the side stoppers 13 are provided in FIG. 16, but the portion of the reflector frame 5 where the upper stoppers 11 and 12 are provided is also shown. As shown in FIG. 18, the configuration is the same as that described above.

With the above-described configuration, the reflecting mirror 8 has its peripheral edge supported by the viscoelastic body 19 and the elastic body 20 as a rotation end, and can be displaced by operating the push-in adjustment bolt 15 and the pull-in adjustment bolt 16. The fitting 14 is the reflector frame 5
It will be supported by.

Although the rim of the reflecting mirror 8 is supported by the viscoelastic body 19 and the elastic body 20 here, it may be supported by the viscoelastic body 19 alone. However, when not only the viscoelastic body 19 but also the compression coil spring 20 is used as the reflecting mirror 8, the peripheral edge of the reflecting mirror 8 is supported more like a rotating end. Further, the displacement of the reflecting mirror 8 is absorbed by the amount of elastic deformation of the reflecting mirror frame 5 and the base metal fitting 14, and is of course smaller than the displacement of the adjusting bolts 15, 16.

Next, a method of adjusting the reflecting mirror unit 1 having the above configuration will be described.

FIG. 19 shows an adjustment method in the case where a concave bend occurs on the left edge of the display area of the projected image on the screen unit 3, and FIG.
FIG. 5 is a cross-sectional view showing portions H, I, and J of FIG. 5, and portions corresponding to the above-mentioned drawings are denoted by the same reference numerals. FIG.
9 (b) shows a left edge portion of the display area, where DE is a display area of the projected image, (e), (w)
Represents the left edge of the display area DE.

Now, as shown as (e) in FIG. 19B, it is assumed that the side edge of the display area DE in the screen unit 3 has a curved shape so as to be convex at the center. Here, this convex curve (E) is caused by the fact that the optical path of the light from the projection unit 2 at the center is longer than the optical path of the light at the end of the side edge of the display area. It shall be assumed.

In this case, the optical path of the light from the projection unit 2 at the center of the side edge of the display area may be shortened.

Therefore, as shown in FIG. 19A, the push-in adjustment bolt 15 is pulled out so as not to act, and the pull-in adjustment bolt 16 is operated to pull the base metal fitting 14 toward the reflecting mirror frame 5 side. I do. As a result, the base fitting 14 is elastically deformed concavely toward the reflector frame 5 side. Due to the deformation of the base fitting 14, the side stopper 13 also undergoes the same elastic deformation, and the reflecting mirror 8 whose peripheral portion is held thereby also undergoes the same elastic deformation. The peripheral edge of the base metal fitting 14 is kept at a constant distance from the reflector frame 5 by a fixing screw 18.

As a result of this adjustment, as is apparent from FIG. 15, the distance to the screen unit 3 increases as the displacement of the reflecting mirror 8 due to the deformation increases. Therefore, in this portion, the reflection from the projection unit 2 The projection distance from the mirror 8 to the screen unit 3 becomes longer. As a result, the concave bending (E) at the side edge of the display area DE shown in FIG. 19B is corrected, and the side edge of the display area DE is straight as shown at (W) in FIG. 19B. In a state.

In this manner, concave bending at the right and left edges of the display area DE can be corrected.

FIG. 20 shows an adjustment method in the case where a concave bend occurs in the upper edge of the display area of the projected image on the screen unit 3, and FIG. 20 (a) is the same as FIG. It is sectional drawing of the reflecting mirror unit 1 seen from the direction,
Parts corresponding to the above-mentioned drawings are denoted by the same reference numerals. FIG. 20 (b) shows the upper edge of this display area, where DE is the display area of the projected image, (f),
(Y) indicates the upper edge of the display area DE, respectively.

Also in this case, as shown in FIG.
It is assumed that the upper edge (Y) of the display area DE is concave, but the distortion of the contour of the display area DE is similar to that of FIG. It is assumed that the optical path of the light from the projection unit 2 at the center of the optical path is longer than that of the optical path.

In this case, the reflecting mirror 8 is made concave toward the reflecting mirror frame 5 by operating the pull-in adjustment bolt 16 ′ provided along the upper fastener 11. As a result, as shown in FIG.
Has a straight upper edge.

Similarly, the lower edge of the display area DE can be made linear by operating the pull-in adjustment bolt on the lower metal fitting 12 side.

FIG. 21 shows an adjustment method when a convex bend occurs at the left edge of the display area of the projected image on the screen unit 3, and FIG.
FIG. 21B is a cross-sectional view showing portions H, I, and J of FIG.
Indicates a left edge portion of the display area, and portions corresponding to the above-mentioned drawings are denoted by the same reference numerals.

Now, as shown as (T) in FIG. 21 (b), it is assumed that the left edge of the display area DE in the screen unit 3 has a curved shape such that it is concave at the center. It is assumed that the curve (T) is caused by the fact that the optical path of the light from the projection unit 2 at the center is shorter than the optical path of the light at the end of the side edge of the display area.

In this case, the optical path of the light from the projection unit 2 at the center of the side edge of the display area may be lengthened.

Therefore, as shown in FIG. 21 (a), the pull-in adjustment bolt 16 is pulled out from the bolt hole of the base fitting 14 so that it does not act.
Is operated to further separate the base fitting 14 from the reflector frame 5. As a result, the base fitting 14 is elastically deformed concavely toward the reflector frame 5 side.
Due to the deformation of the base fitting 14, the side stopper 13 also undergoes the same elastic deformation, and the reflecting mirror 8 whose peripheral portion is held thereby also undergoes the same elastic deformation.

With this adjustment, the larger the displacement of the reflecting mirror 8 due to the deformation, the larger the screen unit 3
Therefore, in this part, the projection distance from the projection unit 2 to the screen unit 3 via the reflecting mirror 8 is increased. As a result, FIG.
A convex curve at the left edge of the display area DE shown in FIG.
Is corrected, and as shown in FIG.
The left edge of the display area DE becomes straight.

The same applies to the right edge of the display area DE. In this manner, the concave bending of the right and left edges of the display area DE can be corrected.

FIG. 22 shows an adjustment method in the case where a convex bend occurs at the upper edge of the display area of the projected image on the screen unit 3, and FIG. 22 (a) is the same as FIG. Sectional view of the reflecting mirror unit 1 viewed from the direction of
FIG. 22B shows the upper edge portion of the display area, and the portions corresponding to the above-mentioned drawings are denoted by the same reference numerals.

Also in this case, as shown in FIG.
It is assumed that the upper edge of the display area DE is convex, but the contour of the display area DE is also distorted at the edge of the upper edge of the display area as in the case of FIG. It is assumed that the optical path of the light from the projection unit 2 at the center thereof is shorter than the optical path of the light.

In this case, the reflecting mirror 8 is made concave toward the reflecting mirror frame 5 by operating the pull-in adjustment bolt 16 ′ provided along the upper fastener 11. As a result, as shown in FIG.
Has a straight upper edge.

Similarly, the lower edge of the display area DE can be made linear by operating the pull-in adjustment bolt on the lower metal fitting 12 side.

Reflector unit 1 when the above embodiment is applied to a multivision (combination type projection display device)
Is the same as that in the first embodiment described above with reference to FIGS.

FIG. 23 is a perspective view showing a fourth embodiment of the reflecting mirror adjusting mechanism according to the present invention, wherein 50 is a reflecting mirror unit, 51 is a reflecting mirror, 52 is a boss, 53 is an outer frame, and 54 is an upper side. Support frame, 55 is a lower side support frame, 56 is a left side support frame, 5
7 is a right side support frame, and 58 is an adjusting screw. FIG.
23 is a sectional view taken along the line PP of FIG. 23 when the reflecting mirror of the reflecting mirror unit 50 shown in FIG. 23 has a planar shape, 59 is a reference plate, 60 is a coil spring, 6
1 is a lower support boss, 62 is an upper support boss, and FIG.
Are assigned the same reference numerals.

In FIG. 23 and FIG. 24 (a), a reflector unit 50 has a reflector 51 that bends the light beam of the image projected from the substantially projection unit by 90 degrees and projects the rear surface onto a screen (not shown). Are supported by four support frames 54 to 57 attached to the boss 52.

That is, each of the support frames 54 to 57 has a substantially fan-shaped flat portion, and a groove having a U-shaped cross section is provided on each of the long sides thereof. The short side at the top is engaged with a groove provided in the boss 52. The upper side of the reflecting mirror 51 is inserted into the groove of the upper support boss 62 provided on the longer side of the upper side support frame 54.
The lower side of the reflector 51 is provided in a groove of a lower support boss 61 provided on the longer side of the lower side support frame 55, and the left side of the reflector 51 is provided on the longer side of the left side support frame 56, not shown. The right side of the reflecting mirror 51 is engaged with the groove of the support boss (not shown) provided on the long side of the right side support frame 57 in the groove of the support boss. 54-57.

A reference plate 59 is fixed at the center of the back surface of the reflecting mirror 52 with an adhesive or the like. A screw hole is provided in the reference plate 59, and a through hole provided in the boss 52 is provided in the screw hole. The distal end of the adjusting screw 58 is screwed through. A coil spring 60 is always provided between the reference plate 59 and the boss 52 in a compressed state. The coil spring 60 urges the reference plate 59 in a direction in which the reference plate 59 separates from the boss 52. Therefore, unless the adjustment screw 58 is turned, the distance between the reference plate 59 and the boss 52 is kept constant. When the adjustment screw 58 is turned, the reference plate 59 is moved in accordance with the rotation direction of the boss 52 (accordingly. , The central part of the reflecting mirror 51) or the boss 52. Thereby, the surface shape of the reflecting mirror can be adjusted.

The adjustment screw 58 is fixed to the reference plate 59 and planted so that it passes through the through hole provided in the boss 52,
A configuration may be employed in which a nut is screwed onto the tip. In this case, by turning the nut, the distance between the boss 52 and the reference plate 59 can be made variable, and the surface shape of the reflecting mirror can be similarly adjusted. Also, the support frames 54 to 57 may be configured to be held by a member that does not deform elastically, but may be configured to be an elastic member.

As described above, the reflecting mirror unit 50 bends the light beam of the image projected from the substantially projection unit by 90 degrees and projects it rearward on the screen. If not provided, it is assumed that the flatness of the reflecting mirror 51 is accurately maintained as shown in FIG. Next, a description will be given of a method of correcting the display area of the projection image by the reflecting mirror 51 in a case where the light beam of the image of the projection unit has no distortion such as curvature.

FIG. 25A is a sectional view taken along the line PP of FIG. 23, and shows a screen unit (not shown).
FIG. 25 (b) shows an adjustment method when a concave bend occurs at the edge of the display area of the projection image in FIG. 25, and FIG. 25 (b) shows a left edge portion of the display area, and FIG. Are given the same reference numerals.

Now, as shown in FIG. 25B, the left edge of the display area DE of the screen unit is curved so that it is concave at the center. The curve (d) is assumed to be caused by the fact that the optical path of the light from the projection unit at the center is shorter than the optical path of the light at the end of the side edge of the display area DE.

In this case, the optical path of the light from the projection unit at the center of the side edge of the display area DE may be lengthened.

Therefore, in FIG. 25 (a), the support frame 54 to 57 is pulled down by rotating the reference plate 59 so as to approach the boss 52 by pulling out the adjusting screw 58 from the reference plate 59, and Each side of the unit 50 is bent backward. Thereby, the reflecting mirror 51
Is to be elastically deformed in a convex shape when viewed from the front.

As a result of this adjustment, the distance from the projection unit to the screen unit via the reflecting mirror 51 is increased in the portion where the amount of displacement of the reflecting mirror 51 due to the deformation is greater as the distance increases. The projection distance becomes longer. As a result, in FIG. 25 (b), the uneven bending (d) at the left edge of the display area DE is corrected, and the left edge of the display area DE becomes linear as shown at (n).

The same applies to the right side edge of the display area DE. In this way, concave bending at the right and left side edges of the display area DE can be corrected.

FIG. 26A is a cross-sectional view taken along the line PP of FIG. 23, and a concave bend occurs at the edge of the display area of the projected image on the screen unit (not shown). FIG. 25 shows an adjustment method in the case.
(B) shows a left edge portion of the display area, and portions corresponding to the above-mentioned drawings are denoted by the same reference numerals.

Now, as shown as (a) in FIG. 26 (b), it is assumed that the left edge of the display area DE in the screen unit has a curved shape such that it is convex at the center. It is assumed that the curved line (a) is caused by the fact that the optical path of the light from the projection unit at the center is longer than the optical path of the light at the end of the side edge of the display area DE.

In this case, the optical path of the light from the projection unit 2 at the center of the side edge of the display area may be shortened.

Then, as shown in FIG. 26A, the adjusting screw 58 is pushed into the reference plate 59 side so that the reference plate 59 is
2 by rotating the support frame 5 away from the support frame 5.
4 to 57 may be pushed forward, and each side of the reflecting mirror unit 50 is warped forward. This allows
The reflecting mirror 51 is elastically deformed in a concave shape when viewed from the front.

With this adjustment, the distance from the projection unit to the screen unit via the reflecting mirror 51 is reduced in the portion where the amount of displacement of the reflecting mirror 51 due to the deformation is larger as the displacement increases. The projection distance becomes shorter. As a result, the uneven bending (la) at the left edge of the display area DE shown in FIG. 26B is corrected, and the left edge of the display area DE becomes linear as shown as (m).

The same applies to the right side edge of the display area DE. In this way, the convex bending of the right and left side edges of the display area DE can be corrected.

As described above, in this embodiment, the unevenness of the projection image of the screen unit from the projection unit can be easily corrected at least by adjusting the adjustment screw.

[0138]

As described above, according to the present invention,
The flatness of the light projected on the screen unit of the projected image of the projection unit can be corrected by displacing the reflecting mirror, so that the projected area of the display area of the projected image on the screen unit is projected at the central portion and the central portion. The flatness of light can be made uniform, and the quality of the projected image can be increased. In particular, in multi-vision, since the sides of the outline of the rectangular display area of each screen alone can be linearized, the quality of the video can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a reflecting mirror adjusting mechanism according to the present invention and an embodiment of a projection display apparatus using the same.

FIG. 2 is a plan view showing one side portion of the reflecting mirror unit as viewed from the direction of arrow B in FIG. 1;

FIG. 3 is an enlarged sectional view showing portions A, B and C of the reflecting mirror unit in FIG. 1;

FIG. 4 is a cross-sectional view taken along the line DD in FIG. 2;

FIG. 5 is a diagram showing an adjustment method when a concave bend occurs in a left edge of a display area of a projection image on a screen unit in FIG. 1;

FIG. 6 is a diagram illustrating an adjustment method when a concave bend occurs at an upper edge of a display area of a projection image on the screen unit in FIG. 1;

FIG. 7 is a diagram showing an adjustment method when a convex bend occurs on a left edge of a display area of a projection image on the screen unit in FIG. 1;

FIG. 8 is a diagram showing an adjustment method when a convex curve is generated at an upper edge of a display area of a projection image on a screen unit in FIG. 1;

FIG. 9 is a front view showing a screen of four-sided multi-vision.

FIG. 10 is a sectional view taken along the line EE in FIG. 9;

FIG. 11 is a cross-sectional view taken along the line FF in FIG. 9;

FIG. 12 is a front view showing a second embodiment of the reflector adjusting mechanism of the projection display apparatus according to the present invention.

FIG. 13 is a cross-sectional view taken along the line GG in FIG. 12;

FIG. 14 is an enlarged sectional view of a portion H in FIG. 12;

FIG. 15 is a cross-sectional view showing a third embodiment of a reflector adjusting mechanism according to the present invention and an embodiment of a projection display apparatus using the same.

FIG. 16 is a plan view showing one side portion of the reflecting mirror unit viewed from the direction of the arrow in FIG.

FIG. 17 shows H, I, J of the reflecting mirror unit in FIG.
It is sectional drawing which expands and shows a part.

FIG. 18 is a sectional view taken along the line NN in FIG. 16;

FIG. 19 is a cross-sectional view showing an adjustment method when a concave bend occurs on the left edge of the display area of the projection image on the screen unit in FIG.

FIG. 20 is a cross-sectional view showing an adjustment method when a concave bend occurs at the upper edge of the display area of the projection image on the screen unit in FIG.

FIG. 21 is a cross-sectional view showing an adjustment method when a convex bend occurs in the left edge of the display area of the projection image on the screen unit in FIG.

FIG. 22 is a cross-sectional view showing an adjustment method when a convex bend occurs at the upper edge of the display area of the projection image on the screen unit in FIG.

FIG. 23 is a perspective view showing a fourth embodiment of the reflecting mirror adjusting mechanism according to the present invention.

FIG. 24 is a sectional view taken along the line PP in FIG. 23;

FIG. 25 is a diagram illustrating an adjustment method when a concave bend occurs at a side edge of a display area of a projection image on a screen unit in a projection display device using the embodiment illustrated in FIG. 23;

26 is a diagram illustrating an adjustment method in a case where a convex bend occurs at a side edge of a display area of a projection image on a screen unit in a projection display device using the embodiment illustrated in FIG. 23; .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Reflector unit 2, 2a Projection unit 3, 3a Screen unit 4 Cabinet 5 Reflector frame 6 Upper support member 7 Lower support member 8, 8a Reflector mirror 9a, 9b Fixing screw 11 Upper stopper 12 Lower stopper 13 Side Stop fitting 14 Base fitting 15, 15 'Push adjustment bolt 16, 16' Retraction adjustment bolt 17, 17 'Stud bolt 18, 18' Fixing screw 19, 19 'Viscoelastic body 20, 20' Elastic body 21 Multivision 22 Multi Screen 23 Screen alone 30 Reflector unit 31 Support plate 32 Reflector frame 33 Fixing bracket 34 L-shaped bracket 35a, 35b Rotating shaft 36 Adjusting screw 37 Reflector 38 Nut 39 Support spring 40 Viscoelastic body 41a, 41b E-ring 42 Fixing screw 50 Reflector unit 51 Reflection Mirror 52 Boss 53 Outer frame 54 to 57 Support frame 58 Adjusting screw 59 Reference plate 60 Coil spring 61, 62 Support boss

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Yamada 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Visual Information Media Division, Hitachi, Ltd. (72) Keiichiro Tanaka Inventor Keiichiro Tanaka Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa No. 292 Hitachi, Ltd. Video Information Media Division (72) Inventor Kofune Ichikawa 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video Image Media Division (72) Inventor Takashi Kanbara Kanagawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Ltd.Video and Media Division, Hitachi, Ltd. (72) Inventor Hotta Daichi 292, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa, Japan

Claims (13)

[Claims] 1. Reflecting image light from an image projection means,
In a mechanism holding a reflecting mirror for changing the optical path of the image light, a means for changing the flatness of the reflecting mirror is provided, and the optical path length of the image light can be partially changed. Characteristic reflector adjustment mechanism. 2. The reflecting mirror adjusting mechanism according to claim 1, wherein a peripheral portion of the reflecting mirror is supported by a viscoelastic member or an elastic member. 3. The reflector according to claim 1, wherein a peripheral portion of the reflector is rotatably supported by a rotation axis in a direction parallel to an outer edge of the reflector and a rotation axis in a direction perpendicular to the outer edge. Mirror adjustment mechanism. 4. The reflection mirror and the frame according to claim 1, wherein a screw and an elastic means are provided on a member holding the reflection mirror and the frame of the reflection mirror, and the screw is rotated. A reflecting mirror adjustment mechanism, characterized in that the mirror can be displaced. 5. The reflecting mirror adjustment mechanism according to claim 4, wherein an optical path length of the image light can be adjusted by rotating the screw to displace the reflecting mirror and the frame. 6. The reflecting mirror adjusting mechanism according to claim 1, wherein the reflecting mirror is deformed by its own weight or a screw operation, and its flatness is corrected. 7. A projection display device for reflecting image light from a projection unit by a reflecting mirror and irradiating the reflecting light on a screen unit, and projecting a projected image of the projection unit on the screen unit. 7. A projection display device comprising the reflecting mirror adjusting mechanism according to any one of 1 to 6, wherein the flatness of light rays of a projected image on the screen unit can be corrected. 8. Reflecting image light from an image projecting means,
In a mechanism holding a reflecting mirror for changing the optical path of the image light, a means for changing the flatness of the reflecting mirror is provided, and the optical path length of the image light can be continuously changed. Characteristic reflector adjustment mechanism. 9. The reflecting mirror adjusting mechanism according to claim 8, wherein a peripheral portion of the reflecting mirror is supported by a viscoelastic member or an elastic member. 10. The reflecting mirror and the frame according to claim 8, wherein a screw and an elastic means are provided on a member holding the reflecting mirror and the frame of the reflecting mirror, and the screw is rotated. A reflecting mirror adjustment mechanism, characterized in that the mirror can be displaced. 11. The reflecting mirror adjusting mechanism according to claim 10, wherein the optical path length of the image light is adjustable by rotating the screw to displace the reflecting mirror and the frame. 12. The reflecting mirror adjusting mechanism according to claim 8, wherein the reflecting mirror is deformed by its own weight or a screw operation, and its flatness is corrected. 13. A projection display device for reflecting image light from a projection unit with a reflecting mirror and irradiating the reflecting light on a screen unit, and projecting a projected image of the projection unit on the screen unit. 13. A projection display device comprising the reflecting mirror adjustment mechanism according to any one of 8 to 12, wherein the flatness of light rays of a projected image on the screen unit can be corrected.