Control device for controlling a diaphragm slot in a microfilm-reading and enlarging apparatus
US4593990A · kind A · utility
4Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1985 |
| Grant date | Jun 10, 1986 |
| Priority date | — |
| Expiry date | Apr 1, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/118
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A device for controlling the width of a slot of a diaphragm of a microfilm-reading-and-copying apparatus in which an enlarged microimage is projected by two inclined mirrors mounted on a movable carriage and via the slot of the diaphragm on a copying cylinder. The diaphragm is formed by two flaps of which one is stationary and another one is movable between a closed position to close the slot and a plurality of open positions to adjust the width of the slot. The drive of the movable flap is provided with a rotatable cam which is coupled to the movable carriage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.