Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1984-05-03
1985-08-27
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 53, G03B 2752
Patent
active
045374988
ABSTRACT:
In the operation of a projection printer (11) photomasks (22), the patterns (21) of which are protected by coverplates (39), are used interchangeably with other photomasks, the patterns of which are located at an open surface thereof. The photomasks (22) feature shims (46) which space the patterns (21) away from a plane of support surfaces (13) of a mounting chuck (12) by a precise distance equal to the shift of the object plane (14) with respect to an image plane (17) because of the presence of the coverplate (39) in the optical path of the projection printer (11).
REFERENCES:
patent: 3379831 (1983-04-01), Loebach
patent: 3951701 (1976-04-01), Csillag
patent: 4063812 (1977-12-01), Abraham et al.
patent: 4361643 (1982-11-01), Banks et al.
patent: 4390273 (1983-06-01), Loebach
Banks Edward L.
Ellington, IV Thomas S.
Zavecz Terrence E.
AT&T - Technologies, Inc.
Hayes Monroe H.
Houseweart G. W.
Schellin W. O.
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