Alignable negative stage for a photographic enlarger

Details Alignable negative stage for a photographic enlarger Alignable negative stage for a photographic enlarger

1993-02-26

1994-12-27

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Detailed holder for original

G03B 2762

Patent

active

053769899

ABSTRACT:
A negative stage comprises a generally flat lower platform and a generally flat upper platform, each of the platforms includes an aperture for allowing passage of light through the platform from a light source in the enlarger.
The platforms are aligned in a face-to-face relationship with the apertures generally in alignment. The platforms are spaced-apart by at least three adjustable support-members extendable in a direction generally perpendicular to the platforms for adjusting spacing and alignment of the platforms. In one embodiment The upper platform is retained in contact with lower platform by spring loaded plungers. The spring loaded retaining arrangement allows relative movement between the platforms for alignment while still retaining the platforms firmly in contact with the support-members.
A light-baffle arrangement prevents light leakage between the platforms.

REFERENCES:
patent: 2153159 (1939-04-01), Schubert
patent: 4015903 (1977-04-01), Zimmet et al.
patent: 4161365 (1979-07-01), Anderson et al.
patent: 4965631 (1990-10-01), Ozawa

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