Photocopying – Projection printing and copying cameras – Detailed holder for original
Patent
1990-03-30
1991-03-26
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Detailed holder for original
G03B 2762
Patent
active
050033484
ABSTRACT:
A negative carrier for use with photographic enlargers consists of two main sections, an upper mounting plate and a lower mounting plate interlocked together to secure and flatten the perimeter of a negative film strip during enlarging when the strip is in registration with aligned central rectangular apertures formed in each plate. Fixed pins located symmetrically about the central aperture on the upper surface of the lower plate have shaft and head portions to establish and maintain alignment of the inserted negative film strip with respect to the central aperture of the lower plate so that frames of the negative film strip may be slid into registration with the central aperture. The upper surface of the upper mounting plate is provided with protruding tabs for holding mounted slides and flexible filter sheets in alignment with the central aperture. In a second embodiment, a rear holding tab is located on the upper surface of the upper mounting plate at a sharp angle toward the front wall to facilitate easy filter sheet insertion while preventing rearward displacement of the sheet. Since the filter sheet is longer than the distance between the tab and the front wall, a curvature of the sheet will be promoted, and, owing to its resilient nature, the sheet will hold itself in place.
REFERENCES:
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patent: 4396281 (1983-08-01), Okabe et al.
patent: 4450536 (1984-05-01), Schroeder
patent: 4455082 (1984-06-01), Lepist
Charles Beseler Company
Wintercorn Richard A.
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