Method of making an aperture plate for a multibeam pattern drawi

Details Method of making an aperture plate for a multibeam pattern drawi Method of making an aperture plate for a multibeam pattern drawi

1996-05-16

1997-09-02

Mathews, Alan A.

Photography

Line generation

347241, G03B 4100, B41J 2447

Patent

active

056642512

ABSTRACT:
For an aperture plate to be used to form dot images of a two dimensional aperture pattern by projection through an imaging optical system in a normal direction, a pattern of markings in ideal positions is projected through an imaging optical system in the reverse direction to normal imaging operations. The image of the pattern is recorded at the position of the aperture plate, and the recorded image is used as a guide to form corrected apertures in the aperture plate. Accordingly, locational errors of the dot images in the normal direction are corrected when the corrected aperture plate is used.

REFERENCES:
patent: 3984845 (1976-10-01), Tashiro et al.
patent: 4003061 (1977-01-01), LaCanfora
patent: 4416522 (1983-11-01), Webster
patent: 4518859 (1985-05-01), Hoshika
patent: 4841316 (1989-06-01), Payone et al.
patent: 5539444 (1996-07-01), Ikeda et al.

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