Illumination means for use in photocopying machine
US3947106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1974 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | Oct 10, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination means for use in association with a SELFOC image transmitter in a photocopying machine. The illumination means comprises at least one light generator in the form of a tubular fluorescent lamp or similar means emitting light through a slit disposed parallel to the longitudinal axis thereof, and an associated light-guide which is made of glass, plastic, or other material having a high refractive index, is generally equal in length to the light-generator, has a generally trapezoidal cross-section, and directs light emitted by the light-generator into an illumination slot or shutter means provided in or below a document rest for illumination of successive portions of a document to be copied, the light-guide broad base and narrow base being proximate to, in line with, and generally equal in width to the light-generator slit and the document rest slot, respectively. Preferably the sides of the light-guide are coated with a reflective film, and a certain area of the central portion of the base thereof may be coated with a reflective patch to eliminate extra light, and so counteract the characteristic tendency of a tubular lamp to produce a greater quantity of light at the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.