Reading head for an optical scanning device
US6207968A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1998 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Jun 26, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0412
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For use with an optical scanning device, a reading head comprising a housing having at least one bore for accommodating therein a respective photo-multiplier tube and a non-intersecting lateral bore for accommodating therein a stimulating light source for producing a stimulating beam having a first wavelength. A focusing lens is mounted in association with the stimulating light source for focusing the stimulating beam on a film of the scanning device so as to produce stimulated fluorescent light having a second wavelength in the film at a point of contact by the stimulating beam. A window is provided within the housing for mounting therein a filter for transmitting therethrough the stimulated fluorescent light whilst substantially blocking reflections of the stimulating beam. The housing is mounted in spaced relationship with the film so as to direct the stimulating light beam perpendicular to the film such that a distance from the film to an internal periphery of the lateral bore within the housing is equal to a focal length of the focusing lens, and the stimulating light source is fixed within the lateral bore so that the focusing lens is in precise registration with the internal…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.