Image forming apparatus capable of detecting original-image density
US4811056A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Sep 25, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/72
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Light beam radiated from an exposure light source of a copying machine is reflected by a predetermined portion of an original. First reflected light beam of reflected light passing through a SELFOC lens is radiated on the surface of a photosensitive body to form an electrostatic latent image thereon. An original image density detecting device is provided next to the SELFOC lens and includes a housing having a slit formed in its upper wall along the axial direction of the photosensitive body, a reflecting plate, provided on an inner bottom wall surface of the housing, and having an aluminum tape adhered on its surface, and a photosensor mounted on an inner upper wall surface of the housing. Of the light beams reflected by the original, second reflected light beam reflected near the SELFOC lens and not passing therethrough is incident into the housing from the slit and reaches the reflecting plate. Third reflected light beam reflected on the surface of the reflecting plate is received by the photosensor, and the photosensor detects the original-image density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.