Lens positioning mechanism and method of using same

Details Lens positioning mechanism and method of using same Lens positioning mechanism and method of using same

1991-02-19

1992-03-24

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 46, 355 54, G03B 2752

Patent

active

050992759

ABSTRACT:
A mechanism for selectively positioning a plurality of different lens units along the optical center-line of a photographic printer. The lens units are mounted on a common carrier and are successively moved into alignment along the optical center-line in response to overall movement of the common carrier, such as along a path that is oblique to the optical center-line. The plurality of different lens units are typically arranged substantially horizontally with respect to one another on the common carrier, and typically include a plurality of lenses having different powers of magnification of focal lengths. The common carrier engages a threaded drive bar disposed substantially parallel to the path that is oblique to the optical center-line to produce movement of the common carrier in relation to the optical center-line. The drive system cooperates with a guide means to retain the original orientation of the common carrier as the common carrier moves along the oblique path. A mask operates to isolate the remaining lens units from the photographic printer. The invention herein further includes an invention methodology for exposing a photographic print on an elongated web of photographic paper from an elongated strip of photographic negative images in a photographic printer using the mechanism previously described.

REFERENCES:
patent: 3689149 (1972-09-01), Livingood
patent: 3951565 (1976-04-01), Lucht
patent: 4583845 (1986-04-01), Lucht et al.
patent: 4737825 (1988-04-01), Davis

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