Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1984-05-03
1985-07-16
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Focus or magnification control
G03B 2752
Patent
active
045292990
ABSTRACT:
A spacer (52) of an interposer element (51) is placed between support surfaces (27) of a mounting chuck (12) in a projection printer (14) and a photomask (48) which is not protected by a coverplate. The interposer element (51) further features a transparent plate (53) which becomes interposed in the optical path (46) of the projection printer (14) in a position spaced from the photomask (48). The plate (53) shifts the objective focal plane (44) with respect to which the support surfaces (27) are adjusted outward away from an image plane by a distance equal to the shift of the objective focal plane due to the coverplate of a coverplate-protected photomask. Consequently, the spacer (52) features a preferred thickness of a coverplate of such coverplate-protected photomask to position patterns (21) of object features on the unprotected photomask (48) in the plane to which the focal plane is shifted by the interposed plate (53).
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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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