JP2008276152A - Mirror positioning jig and mirror attaching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mirror positioning jig and a mirror attaching method with which a mirror can be accurately fixed even though the mirror holding part of a lens housing is not worked with advanced machining accuracy. <P>SOLUTION: The first flange 23 of the lens housing 20 is placed on an inclined housing holding part 48 of the mirror positioning jig 45, and positioned and fixed by a positioning pin 52. By placing the mirror 18 on the mirror holding part 47 inserted in a mirror aperture 34 so as not to come into contact with the mirror aperture 34 and performing air suction by an air pump 49, the mirror 18 is positioned to the first flange 23. Thereafter, the mirror 18 is fixed by filling a gap between the mirror aperture 34 and the mirror 18 with an adhesive. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mirror positioning jig used when a mirror is attached to a casing of a projection lens apparatus, and a mirror mounting method using the mirror positioning jig.

  There is a rear projection device as a large screen monitor device. The rear projection device includes a screen incorporated in a housing, a plane mirror installed behind the screen, and an optical engine that projects image light toward the plane mirror. The optical engine consists of an illumination optical system that produces uniform illumination light from the light of a high-intensity light source, and a color separation / combination optical system that separates the illumination light into three colors and combines them with image information provided by image display elements. And a projection lens unit for enlarging and projecting the image light thus produced onto a plane mirror.

The projection lens unit includes a converging optical system that converges image light incident from the color separation / combination optical system, a mirror that reflects image light converged by the converging optical system, and an image light reflected by the mirror. A projection optical system for projecting onto a plane mirror, and a lens housing into which these are integrated. In the conventional projection lens unit, the outer periphery of the mirror is brought into contact with a mirror holding portion provided in the lens casing, and is fixed to the lens casing by bonding or some holding member (for example, see Patent Document 1).
JP 2005-352293 A

  The mirror position accuracy of the projection lens unit has an important influence on the performance of the rear projection apparatus. For example, when the position accuracy of the mirror with respect to the projection optical system is poor, the projection center position shifts or trapezoidal distortion occurs, and the display image quality deteriorates. Therefore, in the conventional projection lens unit, it is necessary to mold the mirror holding portion of the lens casing with high accuracy and to manage the accuracy, and much man-hour and cost are required for manufacturing the lens casing.

  In addition, it has been conventionally performed to fix the mirror after adjusting the position of the mirror with respect to the projection optical system. However, it is difficult to obtain reproducibility even if the same adjustment is performed on many products, and the adjustment takes time. There is a problem. Furthermore, it is conceivable that the mirror is deformed when press fitting into the lens housing or screws are used for fixing the mirror.

  In order to solve the above problems, the present invention provides a mirror positioning jig and a mirror mounting method capable of fixing a mirror with high accuracy without processing a mirror holding portion of a lens housing with high processing accuracy. To do.

  In order to solve the above-described problems, a mirror positioning jig of the present invention includes a mirror in a housing having a flange to which a projection optical system is attached and a mirror opening to which a mirror that reflects light toward the projection optical system is attached. This is a mirror positioning jig that positions the mirror with respect to the flange at the time of attachment. The housing holding means for positioning the flange to hold the housing, and the mirror when the housing is held by the housing holding means Mirror holding means is provided which is inserted into the opening, and holds and holds the mirror at a preset position and angle with respect to the flange so that the edge does not contact the mirror opening.

  Further, the mirror opening is arranged at a certain angle with respect to the flange, and the housing holding means holds the flange in an inclined state so that the mirror is sucked and held in a substantially horizontal state. Is.

  Further, the mirror mounting method of the present invention is a mirror mounting method for mounting a mirror on a housing having a flange to which a projection optical system is mounted and a mirror opening to which a mirror that reflects light toward the projection optical system is mounted. The flange is positioned on the housing holding means to hold the housing, the mirror holding means inserted into the mirror opening is sucked and held, and an adhesive is placed in the gap between the mirror edge and the mirror opening. It is filled and the adhesive is solidified.

  According to the mirror positioning jig of the present invention, the positioning of the flange and the mirror can be completed with high accuracy simply by holding the casing on the casing holding means and attracting and holding the mirror on the mirror holding means. Positioning can be completed easily and in a short time even by a poor operator. In addition, since the mirror positioning jig increases the reproducibility of the mirror positioning accuracy, high optical performance can be obtained.

  Further, since the mirror is attracted and held by the mirror holding means in a substantially horizontal state, the mirror can be easily supplied to the mirror holding means.

  In addition, since the mirror mounting method of the present invention is fixed with an adhesive so that the mirror and the mirror opening are not in contact with each other, it is necessary to provide a high-precision mirror holding portion for contacting the mirror in the housing. Disappear. Thereby, the manufacturing man-hour and manufacturing cost of a housing | casing can be reduced.

  In FIG. 1, the rear projection device 2 is fixed to the bottom of the housing 3 via a screen 4 provided on the front surface of the housing 3, a flat mirror 5 provided behind the screen 4, and a fixing portion 6. And an optical engine 7. The plane mirror 5 is attached to be inclined in a posture close to parallel to the screen 4 in order to reduce the depth dimension of the rear projection device 2.

  The optical engine 7 is configured by connecting an image generation unit 10 that generates image light and a projection lens unit 11 that projects image light. The optical engine 7 is incorporated so that the optical axis of the image light projected from the projection lens unit 11 is inclined with respect to the screen 4, and the image light is reflected by the plane mirror 5 to project an image on the screen 4. . Here, the image is projected on the back side of the screen 4 while being reversed horizontally, but the image is correctly displayed when viewed from the front.

  The image generation unit 10 includes, for example, a light source unit, an illumination optical system, a color separation / synthesis optical system, and the like. For the light source unit, for example, a high-intensity light source such as a metal halide lamp, an ultrahigh pressure mercury lamp, or a xenon lamp is used depending on the application. The illumination optical system includes a fly-eye lens, a polarization conversion element, a condenser lens, and the like, and generates uniform illumination light from light irradiated from the light source unit. The color separation / combination optical system includes, for example, a dichroic mirror, a polarizing prism, a dichroic prism, a composition prism, an LCD panel, etc. Image light is generated, and the image light of each color is synthesized again.

  As shown in FIG. 2, the projection lens unit 11 includes a converging optical system 17, a mirror 18, a projection optical system 19, and a lens housing 20 that holds them. As shown in FIG. 3, the lens housing 20 is formed in a substantially box shape having a rectangular opening 21 on the upper surface made of light-shielding plastic, and a lens barrel mounting portion 22 to which the converging optical system 17 is mounted. And a first flange 23 to which the projection optical system 19 is attached, and a second flange 24 used for connection to the image generation unit 10.

  The converging optical system 17 includes a lens barrel 27 and a converging lens 28 incorporated in the lens barrel 27. The lens barrel 27 is inserted into a hole 22a formed in the lens barrel mounting portion 22, and a flange portion 27a formed on the outer periphery is fixed to the lens barrel mounting portion 22 with screws or the like. The converging optical system 17 converges the image light incident from the image generation unit 10 and emits it to the mirror 18 along the optical axis L1.

  The mirror 18 is inclined at an angle of 45 degrees with respect to the optical axes L1 and L2 so as to reflect the image light incident from the converging optical system 17 so as to be incident on the projection optical system 19 along the optical axis L2. ing. The mirror 18 is accommodated so as not to come into contact with a mirror opening 34 larger than the outer shape of the mirror 18 formed in the lens housing 20, and as shown in FIG. It is fixed by the adhesive 35 filled in the gap.

  The projection optical system 19 includes a substrate 38 that is fixed to a plurality of mounting holes 23 a provided in the first flange 23 with screws, a projection lens barrel 39 that is attached to the substrate 38, and a projection lens barrel 39 that holds the projection optical system 19. The projection lens 40 is constructed. The projection optical system 19 enlarges the image light incident along the optical axis L <b> 2 and projects it onto the plane mirror 5.

  Next, a mirror positioning jig used when fixing the mirror 18 to the lens housing 20 will be described. A mirror positioning jig 45 shown in FIG. 5 includes a base portion 46 installed on a work table and the like, a mirror holding portion 47 erected vertically from the base portion 46, and an outer periphery of the mirror holding portion 47. And an air pump 49 that sucks the mirror 18 through the mirror holding part 47.

  The housing holding portion 48 positions and holds the first flange 23 of the lens housing 20, and has a plurality of positioning holes 48a corresponding to the mounting holes 23a. The housing holding part 48 is inclined at an angle of 45 degrees in order to hold the mirror 18 in a horizontal state by the mirror holding part 47. As shown in FIG. 6, the lens housing 20 is placed on the housing holding portion 48 so that the mirror holding portion 47 is inserted into the mirror opening 34, and the positioning pin 52 is inserted into the mounting hole 23a and the positioning hole 48a. To be positioned and held.

  The mirror holding portion 47 is provided with a holding surface 55 for attracting and holding the mirror 18 at the tip, and the outer shape of the holding surface 55 is formed to be slightly smaller than the mirror 18. An air passage 56 connected from the holding surface 55 to the side surface of the base portion 46 is provided in the mirror holding portion 47, and the air passage 56 and the air pump 49 are connected by a pipe 57 or the like.

  The holding surface 55 is disposed so as to hold the mirror 18 at a preset position and angle with respect to the first flange 23 of the lens housing 20 held by the housing holding portion 48. Therefore, the positioning of the first flange 23 and the mirror 18 is completed by fixing the first flange 23 to the housing holding portion 48 and attracting and holding the mirror 18 to the mirror holding portion 47.

  Next, a method for attaching the mirror 18 using the mirror positioning jig 45 will be described. As shown in FIG. 5, the lens housing 20 is placed on the housing holding portion 48, the positioning pins 52 are inserted into the positioning holes 48a and the mounting holes 23a to position the first flange 23, and the lens housing 20 is mounted. Hold.

  The mirror 18 is placed on the mirror holding portion 47 inserted into the mirror opening 34 and the air pump 49 is operated. As a result, the mirror 18 is sucked and held by the mirror holding portion 47 and positioned with respect to the first flange 23.

  As shown in FIG. 7, after positioning the mirror 18, for example, a dispenser 60 fills the mirror 18 and the mirror opening 34 with four UV curable adhesives 35 and irradiates the UV lamp 61 with UV rays. Solidify.

  As described above, the positioning of the first flange 23 and the mirror 18 is completed simply by attaching the mirror 18 and the lens housing 20 to the mirror positioning jig 45. Can be done easily and without mistakes. Further, since the mirror 18 and the mirror opening 34 are fixed with the adhesive 35 without being in contact with each other, it is not necessary to form the mirror opening 34 with high accuracy. Thereby, the cost of the projection lens unit 11 can be reduced.

  In the above embodiment, the positioning pin 52 is inserted into the positioning hole 48a and the mounting hole 23a when positioning the lens housing 20 in the housing holding portion 48. However, the lens housing 20 and the housing holding portion 48 A positioning pin may be erected on either one of them and a positioning hole on the other.

  In the above embodiment, the projection lens unit of the rear projection apparatus has been described as an example. However, the projection lens unit can be applied to other lens units, optical apparatuses, and the like, and can also be applied to positioning of optical components other than the mirror. .

It is the schematic which shows an example of a rear projection apparatus. It is sectional drawing which shows the structure of a projection lens unit. It is a perspective view which shows the external appearance shape of a lens housing | casing. It is a perspective view which shows the fixed state of a mirror. It is an external appearance perspective view which shows the structure of a mirror positioning jig. It is a perspective view which shows the holding state of the lens housing | casing by a mirror positioning jig | tool. It is sectional drawing of a mirror and mirror opening.

Explanation of symbols

2 Rear Projection Device 11 Projection Lens Unit 17 Convergence Optical System 18 Mirror 19 Projection Optical System 20 Lens Housing 23 First Flange 34 Mirror Opening 35 Adhesive 45 Mirror Positioning Jig 47 Mirror Holding Part 48 Case Holding Part 49 Air Pump

Claims (3)

The mirror is positioned with respect to the flange when the mirror is attached to a housing having a flange to which the projection optical system is attached and a mirror opening to which a mirror that reflects light toward the projection optical system is attached. In the mirror positioning jig,
Housing holding means for positioning the flange and holding the housing;
When the case is held by the case holding means, the case is inserted into the mirror opening, the mirror is at a preset position and angle with respect to the flange, and the edge contacts the mirror opening. A mirror positioning jig provided with a mirror holding means for holding by suction. The mirror opening is disposed at an angle with respect to the flange,
The mirror positioning jig according to claim 1, wherein the housing holding means holds the flange in an inclined state so that the mirror is sucked and held in a substantially horizontal state. In a mirror mounting method for mounting the mirror on a housing having a flange to which the projection optical system is mounted and a mirror opening to which a mirror that reflects light toward the projection optical system is mounted,
In the case holding means according to claim 1 or 2, the flange is positioned to hold the case,
The mirror holding means inserted in the mirror opening is sucked and held at a preset position and angle with respect to the flange, and the edge is not in contact with the mirror opening,
Fill the gap between the mirror edge and the mirror opening with an adhesive,
A method for mounting a mirror, wherein the adhesive is solidified.

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