Reflection type hologram scale

Details Reflection type hologram scale Reflection type hologram scale

1992-02-11

1993-11-02

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 1, 359507, 359572, 356356, 250237G, G02B 532, G02B 518, G01B 1100

Patent

active

052588610

ABSTRACT:
A reflection type hologram scale, in which a hologram dry plate is bonded to a protecting base member in which a hologram grating formed on a scale base member forming the hologram dry plate and a reflecting film formed on a base member forming the protecting base member are opposed to each other. Therefore, the hologram grating and the reflecting film are both protected by the scale base member and the base member so that the hologram grating and the reflecting film are prevented from being exposed to the air, thereby preventing the hologram grating and the reflecting film from being smudged by fingermarks, dust and also from being scratched.

REFERENCES:
patent: 3552853 (1971-01-01), Sanders
patent: 4014602 (1977-03-01), Ruell
patent: 4112295 (1978-09-01), Dubik et al.
patent: 4676645 (1987-06-01), Taniguchi et al.
patent: 4818045 (1989-04-01), Chang
patent: 4930895 (1990-06-01), Nishimura et al.
patent: 4979826 (1990-12-01), Ishizuka et al.
patent: 5050993 (1991-09-01), Tansey

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