Reader-printer apparatus and method for variable length copying of information on a standard sheet length
US4739368A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1986 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Apr 18, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/118
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A microform reader-printer apparatus includes a viewing screen having ruler-like fiducial marks that are indicative of distance from an edge of an image frame being viewed. The apparatus includes a keyboard permitting the operator to input data to a printer control regarding the portion of the image frame which is desired to be copied by the printer. In the printing mode the portion of the image frame selected for reproduction is printed using an electrophotographic reproduction engine. An electro-static image of the image selected for reproduction is formed on a photoconductive drum by translating a pair of scanning mirrors. Means including a notched bracket movable with the scanning mirror is provided for controlling the "on" time of a projection lamp and/or corona charger so that electrostatic image formation occurs only for the portion of the image frame selected for reproduction. Adjustments to lamp "on" time are also made for different lamp brightness readings, since brighter lamps take a longer time to quench. Means are also provided for controlling lamp brightness in accordance with the exposure requirements of the portion selected for reproduction. The electrostatic image …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.