Light sensor apparatus for sheet transport
US5006720A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1990 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Mar 27, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2511/224
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A light sensor device along a sheet transport track, having light emitting and sensing means in one of the track's two spaced apart walls, for emitting light energy and sensing the light energy reflected back from a sheet interposed between the walls and in the path of the emitted light energy. The sensor device also includes light absorbing means in the other wall of the track for absorbing the light energy emitted from the light emitting and sensing means when the sheet is not interposed between the light emitting and sensing means. The light absorbing means includes a transparent cylindrical member having a polished end surface for receiving the emitted light energy, the cylinder's other end surface and the cylinder's cylindrical surface being light energy absorbent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.