JP2010230976A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector, not requiring readjustment by preventing distortion in a curved mirror even when the curved mirror are screwed at two or more portions thereof, and achieving three-dimensional positioning for the curved mirror at one time. <P>SOLUTION: This projector includes: a projection lens from which image light is emitted; and the curved mirror 18 for reflecting the image light emitted from the projection lens toward a screen. The curved mirror 18 has a reflecting surface 17 on one side of a mirror body 25, and a fitting member 30 is mounted to each of mounting lug parts 26 provided on the right and left outsides of the reflecting surface 17. Two fitting members 30 respectively have two projecting parts 34 formed by outward drawing, the projecting parts 34 are fitted to cutout parts 36 formed in a holding frame 19 with a clearance, and in such a state, positioning for the curved mirror 18 is performed by a 6-axis adjusting tool. After positioning, the clearance between the projecting parts 34 and the cutout parts 36 are filled with an adhesive to thereby secure the curved mirror. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a reflection projector provided with a curved mirror.

  The reflection projector is configured to reflect the image light projected from the projection optical system by a curved mirror and guide it to the screen. The curved mirror is generally an aspherical mirror such as a parabolic mirror having no spherical aberration so as to send reflected light far away. An aspherical mirror is composed of a curved surface formed when a predetermined noncircular curve, such as a parabola, is rotated around a predetermined basic axis that extends linearly, and the curved surface is the only mirror axis based on the basic axis. Therefore, in order to reflect the image light in the correct direction, highly accurate three-dimensional three-dimensional position adjustment is required when the curved mirror is assembled. With respect to this, the curved mirror is floatingly supported at three points with respect to the holding member, and the mounting position of the curved mirror is adjusted by individually adjusting the floating amount at each point. However, the adjustment of the floating amount of each support point in the three-point floating support has an influence on all three geometric axes (solid coordinate axes) constituting the curved mirror in the position adjustment of the curved mirror. However, while the degree of freedom of adjustment is high, it is impossible to adjust only the angle around the specific coordinate axis of the curved mirror, and it is necessary to repeatedly adjust each floating amount to find the best state. In order to improve this problem, Japanese Patent Application Laid-Open No. 2004-228867 proposes a mirror mounting device that adjusts the tilt angle by rotating an aspherical mirror about the X axis orthogonal to the Z axis (base axis).

JP 2008-139442 A

  However, in the device described in Patent Document 1, the angle adjustment operation of the curved mirror is simplified compared to the conventional three-point floating support structure, but the angle of the curved mirror is fixed because it is fixed in the YZ plane. Only adjustment is possible, and it cannot be said that the three-dimensional position adjustment of the mirror optical axis that is originally required is performed. Also, if the mounting member is fixed by screwing it to multiple places on the curved mirror, the curved mirror may be distorted or the adjusted position may be displaced due to the tightening pressure of the screw, and it will be necessary to readjust. There is.

  The present invention is for solving the above-described problem. Even if the mounting member is screwed to a plurality of locations on the curved mirror, the curved mirror is not distorted so that no readjustment is required. We propose a projector that can be adjusted in one position.

  The projector according to the present invention is fixed to the projection lens that emits an image projected on the screen, the curved mirror that reflects the image light emitted from the projection lens toward the screen, and the curved mirror by one screw. A plurality of mounting members and a holding member fixed to the housing.

  The mounting member is preferably formed with two protrusions that form a gap with the holding member, and is fixed at two locations on the curved mirror. Alternatively, only one protrusion that forms a gap with the holding member may be formed and fixed to three or more of the curved mirrors. The plurality of attachment members may be fixed to the holding member by solidifying an adhesive filled so as to fill a gap with the holding member.

  In the projector according to the present invention, since all of the mounting members fixed to the plurality of positions of the curved mirror are each fixed with one screw, unnecessary pressure due to screw tightening is not generated, and the curved mirror is distorted. There is nothing. In addition, since it is fixed with an adhesive while the attachment member and the holding member are kept in contact with each other, unnecessary pressure due to the fixing is not applied to the mirror. There is nothing to do.

It is a schematic diagram which shows the structure of the projector by this invention. It is a figure explaining the holding frame attached to the lower case. It is a perspective external view of the curved mirror attached to the holding frame. It is a perspective external view which shows an attachment member. It is the perspective appearance figure which looked at the curved mirror attached to the holding frame from the back. It is a figure explaining supporting the back surface of a curved mirror with a suction disk. It is a figure which shows the state by which the curved mirror was supported by the 6-axis adjustment jig. It is explanatory drawing of the support method of another curved mirror. It is a perspective external view of another curved mirror attached to the holding frame. It is a perspective external view which shows an attachment member. It is a perspective external view which shows another attachment member.

  As shown in FIG. 1, a projector 10 according to the present invention includes a projection device 15 having a projection lens 14 that emits image light in a substantially rectangular parallelepiped housing 13 including an upper case 11 and a lower case 12, and the projection A holding frame (holding member) 19 (see FIG. 2) that holds a curved mirror 18 having a reflecting surface 17 that reflects the image light emitted from the device 15 toward the screen 16 is accommodated and fixed. Further, a focus adjustment dial (not shown), a power switch (not shown), and the like that can adjust the focus of the image projected on the screen 16 by moving the projection lens 14 are provided. As shown in FIG. 2, the holding frame 19 includes a substrate 22 fixed to the lower case 12 with screws 21, and two support plates 23 erected on the substrate 22. The substrate 22 is spot-welded 24.

  As shown in FIG. 3, the curved mirror 18 has the reflecting surface 17 on one surface of a mirror main body 25 made of a substantially rectangular plate-like member formed with a substantially uniform thickness. The reflection surface 17 is formed as an aspherical mirror surface. Mounting ears 26 are provided at two locations on the left and right sides of the reflecting surface 17. Each mounting ear 26 is formed with three mounting holes 27 arranged at equal intervals, and the central mounting hole 27 has a screw. 28 is inserted, and the rotation stop boss 32 formed in the attachment member 30 is inserted into the other attachment hole 27. As shown in FIG. 4, the rotation stop boss 32 is formed on the mounting seat 31 formed on the mounting member 30, and a screw hole 33 is formed at the center of the mounting seat 31. The mounting member 30 includes two protrusions 34 formed to extend in the same direction outside the rotation stop boss 32 and parallel to a line perpendicular to a line connecting the centers of the two rotation stop bosses 32. The screw 28 is screwed into the screw hole 33 and fixed to the mounting ear 26. As shown in FIG. 5, the curved mirror 18 includes an adhesive 38 (for example, an ultraviolet curable type) in which the protrusion 34 and the notch 36 formed in the holding frame 19 are formed after the reflecting surface 17 is positioned. Resin, epoxy two-component adhesive, etc.). The reflecting surfaces 17 and 52 are not limited to an aspherical surface, and may be a shape other than an aspherical surface as long as it is a curved surface, and may be a convex surface as well as a concave surface. The mirror body 25 may be a resin molded product or a metal. The reflection surface 17 may be appropriately selected according to the material of the mirror body 25, such as metal vapor deposition, chemical plating, or mirror polishing.

  Next, an assembling procedure and operations / effects of the projector 10 will be described. As shown in FIGS. 6 and 7, the screw 28 is inserted into the mounting hole 27 formed in the center of the mounting ear portion 26 of the curved mirror 18, and the inserted screw 28 is used to mount the mounting member 30. The mounting member 30 is fixed to the left and right two portions of the curved mirror 18 by screwing into the screw holes 33 formed in the seat 31. The suction disk 42 held by the tip 41 of a 6-axis adjustment jig (position adjustment jig) 40 that is an articulated robot adsorbs the approximate center of the back surface 44 of the curved mirror 18. The six-axis adjusting jig 40 is configured so that the projection 34 of the attachment member 30 is brought into contact with the notch 36 formed in the holding frame 19 attached in advance to the lower case 12 together with the projection device 15. By fitting, a gap as an adjustment allowance is secured between the notch 36 and the protrusion 34. As shown in FIG. 8, a gripping member 46 may be bonded to the back surface 44 of the curved mirror 18 and gripped by the tip 41 of the six-axis adjustment jig 40.

  The power switch is turned on and image light is emitted from the projection device 15. The emitted image light is reflected by the reflecting surface 17 of the curved mirror 18 and projected onto the screen 16. The position of the reflecting surface 17 is adjusted by the six-axis adjusting jig 40 while observing the state of the projected image, and when the correct position is reached, the projection 34 and the notch 36 are bonded to the gap. The material 38 is filled, the adhesive material 38 is solidified, and the protrusion 34 is fixed to the notch 36. Thereby, the curved mirror 18 is fixed to the lower case 12 at a correct position with respect to the projection device 15. Since the position adjustment of the reflecting surface 17 is performed by the 6-axis adjustment jig, the adjustment time is adjusted at a time, so the work time for the adjustment is short. The 6-axis adjusting jig 40 can simultaneously adjust the position of the X-axis, Y-axis, and Z-axis and adjust the angle of the X-axis, Y-axis, and Z-axis. Axis robot ProSix series etc.

  Next, another embodiment will be described. The same reference numerals are used for the same components as in the above embodiment, and detailed description is omitted. As shown in FIGS. 9 to 11, the curved mirror 53 has an aspherical reflecting surface 52 on one surface of a mirror main body 51 made of a substantially rectangular plate-like member formed in a substantially uniform thickness. Mounting ears 54 are provided at a total of four locations on the right and left sides on the outer side of the reflecting surface 52, and one mounting hole 55 and one positioning hole 56 are formed in each mounting ear 54. Two attachment members 60 and 61 are attached to each of the four attachment ears 54. Each of the mounting members 60, 61 is formed with only one mounting seat 64 having one screw hole 62 and one positioning boss 63, and the screw 28 inserted through the mounting hole 55 is connected to the screw hole 62. The mounting seat 64 is screwed to the back side of the mounting ear 54 by screwing. At this time, when the positioning boss 63 is fitted into the positioning hole 56 and the screw 28 is tightened, the rotation is stopped. Further, it has one protrusion (projection) 65 formed by extending in the direction perpendicular to the positioning boss 63 with the screw hole 62 as the center, and each of the attachment members 60 and 61 has the protrusion 65. The mirror body 51 is fixed so as to be outside. The curved mirror 53 is adjusted in the position of the reflecting surface 52 by the six-axis adjusting jig 40 while observing the state of the image by the image light emitted from the projection device 15, and the curved mirror 53 is in the correct position. The protrusion 65 and the notch 36 are fixed by the adhesive 38.

  The shape of the notch 36 and the protrusions 34 and 65 is not limited to the shape shown in the figure, and any shape can be used as long as the two can be fixed after adjusting the positions of the reflecting surfaces 17 and 52. It may be a shape. In the present invention, two or more mounting members provided with one or two projections may be used, and the total of the projections may be three or more. For example, the projection has one mounting member and a projection. It may be provided with one mounting member formed with two parts. Or the said notch part may exist in six places and the four said projection parts may be provided.

DESCRIPTION OF SYMBOLS 10 Projector 11 Upper case 12 Lower case 13 Case 15 Projection device 16 Screen 17, 52 Reflecting surface 18, 53 Curved mirror 19 Holding frame (holding member)
25, 51 Mirror body 26, 54 Mounting ear 27, 55 Mounting hole 30, 60, 61 Mounting member 31, 64 Mounting seat 32 Anti-rotation boss 33, 62 Screw hole 34, 65 Projection (projection)
36 Notch 38 Adhesive 40 6-axis adjustment jig (position adjustment means)
41 Tip (tip of 6-axis adjustment jig)
42 Suction plate 44 Back side 46 Gripping member 56 Positioning hole 63 Positioning boss

Claims (4)

A projection lens that emits an image projected on the screen;
A curved mirror that reflects the image light emitted from the projection lens toward a screen;
A plurality of attachment members each fixed to the curved mirror by one screw;
The plurality of mounting members are fixed, and a holding member fixed to the housing;
A projector comprising:   2. The projector according to claim 1, wherein the mounting member is formed with two protrusions that form a gap with the holding member, and is fixed at two positions of the curved mirror.   2. The projector according to claim 1, wherein the attachment member is formed with only one protrusion that forms a gap with the holding member, and is fixed at three or more positions of the curved mirror.   The projector according to claim 1, wherein the plurality of attachment members are fixed to the holding member by solidifying an adhesive filled so as to fill a gap with the holding member. .

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