JPH04345158A - Mirror fixing method - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to equipment for fixing mirrors in environments where temperature changes occur.

0002

2. Description of the Related Art Conventionally, when fixing a mirror to a fixed frame, the mirror is fixed to the fixed frame with double-sided tape or the like. Fixed with spring support. Such methods were used.

0003

[Problem to be Solved by the Invention] However, when fixed using these methods, due to the difference in expansion coefficient due to temperature between the mirror and the fixing frame, when a temperature change occurs, unreasonable force is applied to the mirror, causing the direction of the mirror to change. There were defects such as deformation and twisting, which significantly reduced the precision of the surface.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such conventional drawbacks and to maintain the surface accuracy of the mirror and the mounting position relative to the fixed frame even when temperature changes occur.

[0005]

[Means for Solving the Problems] The present invention includes a mirror in a fixed frame,
Securely fixed in one place using spring support, adhesive support, etc. Fix another part with double-sided tape.

[0006] With these fixing methods, first, the former eliminates changes in the angle of the mirror, and second, the latter makes it possible to maintain the surface accuracy of the mirror. It is characterized by no change in accuracy.

[0007]

[Operation] If the expansion coefficients of the mirror and fixed frame differ depending on the temperature,
The positional relationship between the fixed frame and the mirror changes due to temperature changes. Therefore, by firmly fixing the mirror in one place, the mirror can expand and contract freely with the fixed frame as a reference, no undue force is applied to the mirror, and the angle of the mirror does not change. In addition, by supporting another part with double-sided tape, even if the positional relationship with the fixed frame changes due to expansion and contraction due to temperature changes, surface accuracy can be maintained because no direct stress is placed on the mirror.

[0008]

[Embodiment] An embodiment of the present invention will be explained based on the drawings.

FIG. 1 is a perspective view of one embodiment of the present invention.

There are fixed stands 3 and 4 on the fixed frame 1, and their surfaces are on the same plane. The fixed base 4 and mirror 2 are fixed with adhesive 6, and the fixed base 3 and mirror 2 are fixed with double-sided tape 5. When fixed in this way, the mirror and the fixing base are securely fixed with adhesive, so if there is a temperature change, it can expand and contract freely based on the fixing base, and no undue force is applied to the mirror. . Therefore, the angle of the mirror does not change. Furthermore, since other parts are fixed with double-sided tape, even if the mirror's positional relationship with the fixed frame changes, no direct stress is placed on the mirror, so surface accuracy is maintained.

FIG. 2 is a perspective view of one embodiment of the present invention.

There are fixed stands 13 and 14 on the fixed frame 11,
Their surfaces lie on the same plane. The fixed base 14 and the mirror 12 are fixed with spring support by an elastic body 17.
The fixing base 13 and the mirror 12 are fixed with double-sided tape 15.

[0013] When fixed in this way, the mirror and the fixing base are securely fixed by the spring support of the elastic body.
When a temperature change occurs, the mirror can be expanded and contracted freely based on the fixed base, no undue force is applied to the mirror, and the angle of the mirror does not change. In addition, since other parts are fixed with double-sided tape, even if the positional relationship with the fixed frame changes, no direct stress is placed on the mirror, and the surface accuracy is maintained.

FIG. 3 is a perspective view of an optical system unit of a video projector that combines a plurality of images to create one image using dichroic mirrors that have different transmission and reflectance characteristics depending on the wavelength.

FIG. 4 is a diagram showing how light from input direction 1 and input direction 2 are combined.

In the method of the present invention, when the dichroic mirrors 33, 34, 43 shown in FIGS. 3 and 4 are fixed, the angles do not change due to temperature changes, so when an image is projected on the screen, input direction 1, input Images from both directions (direction 2) will no longer be misaligned.

Furthermore, since the surface accuracy is maintained, there is no possibility that only one of the images will be out of focus.

Furthermore, when the total reflection mirror 42 shown in FIG. 4 is fixed by the method of the present invention, the deviation of the image from the input direction 1 and the deviation of the focus can be similarly eliminated.

Although this embodiment shows the case where the mirror is fixed at two places, the same applies to the case where the mirror is fixed at three or more places.

The same applies to the case where a thin elastic body is used instead of the double-sided tape, and the method of fixing in two places as shown in the embodiment.

[0021]

Effects of the Invention: When the mirror fixing method of the present invention is applied to a video projector as explained above, the surface accuracy and mirror angle do not change due to temperature changes, so the image becomes blurry.
This has the effect of eliminating image distortion and creating more beautiful images.

Furthermore, the fixing method is simple, which is advantageous for mass production.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the invention.

FIG. 2 is a perspective view of an embodiment of the invention.

FIG. 3 is a perspective view of an optical system unit of a video projector that is an embodiment of the present invention.

FIG. 4 is an explanatory diagram of an optical system unit of a video projector according to an embodiment of the present invention.

[Explanation of symbols]

1, 11 Fixed frame 2, 12 Mirror 3, 4, 13, 14 Fixed stand 5, 15 Double-sided tape 6. Adhesive 17 Elastic body 31, 41 Lens 32, 42 Mirror

Claims (2)

[Claims] 1. A method for fixing a mirror, comprising fixing the mirror to a fixing frame by fixing with adhesive and fixing with double-sided tape. 2. A method for fixing a mirror, comprising fixing the mirror to a fixing frame using spring support and fixing using an elastic body and fixing using double-sided tape.