Method and apparatus for maintaining desired exposure levels

Details Method and apparatus for maintaining desired exposure levels Method and apparatus for maintaining desired exposure levels

1989-05-31

1991-01-22

Martin, Roland E.

Radiation imagery chemistry: process, composition, or product th

Liquid crystal process, composition, or product

430 31, 430 39, 430270, 430494, 430945, 350 66, 21912174, 264 14, 427 531, 427 541, G03G 1304, G03C 504

Patent

active

049870440

ABSTRACT:
A radiation beam used for selectively exposing a surface is moved in a helical path by means of two oscillating mirrors vibrating about axes that are mutually perpendicular. By maintaining a constant product for oscillating frequency and rotational oscillatory mirror deflection, the level of exposure can be made substantially constant.

REFERENCES:
patent: 2775758 (1956-12-01), Munz
patent: 3364497 (1968-01-01), MacAdam
patent: 3743777 (1973-07-01), Hanus
patent: 4575330 (1986-03-01), Hull
patent: 4752498 (1988-06-01), Fudim
Kodama-American Institute of Physics-"Automatic Method For Fabricating a Three-Dimensional Plastic Model L with Photo-Hardening Polymer", Herbert-Image Technology-Solid Object Generation.
Herbert-The Society for Imaging Science and Technology-"A Review of 3D Solid Object Generation".

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