Light emitting device providing a collimated light beam
US6752525B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2000 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Sep 25, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/6835
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An autochanger has a plurality of media holding bays to hold media pieces. A light emitter and light receiver are placed within the autochanger to establish a light path adjacent the media holding bays. When the light path is disrupted an indication is provided that a media piece is dislodged from its media holding bay. The light emitter has a tube with a light source located adjacent an input end of the tube and a lens located adjacent an output end of the tube. The input end of the tube has a relatively small aperture to limit light passing into the tube and to the lens. The light emitter serves to provide pseudo-collimated light that illuminates a specific light receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.