Integrating cylinder with end input illumination for use as an illuminator in a film scanner
US5241459A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04796
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An integrating cylinder for use as an illuminator for a film scanner includes a hollow cylinder including an inner surface defining a cavity therein and an outer surface, a diffusing layer of reflective material covering an inner surface of the hollow cylinder, a first end plate for sealing a near end of the hollow cylinder, and a second end plate for sealing a far end of the hollow cylinder opposite the near end. The hollow cylinder defines a slit formed parallel to a longitudinal axis of the hollow cylinder between the inner and outer surfaces at a predetermined line along a circumference of the hollow cylinder. The first end plate defines a hole which is decentered from the longitudinal axis of the hollow cylinder and can be tilted at a predetermined angle to the longitudinal axis of the hollow cylinder towards an area of the inner surface of the hollow cylinder. Additionally, the hole is located at a predetermined angular separation around the circumference of the hollow cylinder from the slit for receiving a light beam directed at the predetermined angle to the longitudinal axis into the cavity. After reflections in the cavity, the light emerges from the slit to form a line of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.