Photographic printing or enlarging apparatus
US4239382A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1979 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Apr 30, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic printing or enlarging apparatus incorporates a negative carrier, a lens stage, and a positioning device for positioning the lens stage toward and away from a negative carrier. The positioning device comprises a body and one or more push rods each of which is mounted on, and releasably secured to, the body for movement in the direction of its length. A selected push rod is positioned to engage the lens stage, or a part of the apparatus connected to the lens stage, to fix the position of the stage relative to the negative carrier in accordance with the predetermined setting of the selected push rod. The positioning device may incorporate a plurality of push rods or may incorporate a single push rod that may selectively be extended and locked in an extended position to contact a portion of the apparatus connected to the lens stage for fixing the distance between the lens stage and the negative carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.