Filter mechanism with interconnected heat and color filters for optical examination devices
US4043646A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1976 |
| Grant date | Aug 23, 1977 |
| Priority date | — |
| Expiry date | May 27, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B1/0638
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A filter mechanism for use with a source of white light permits selective color filtration of the white light, as well as unfiltered light transmission. A color filter support, having a plurality of spaced color filters, mounts the filters for selective movement in and out of the path of light from the source. A heat protection filter support mounts a heat protection filter for movement between an active position in the path of light from the source and an inactive position out of the path of light. In a preferred embodiment, the color filter support and heat filter support are mechanically coupled so that when a color filter is placed in the path of light, the heat filter is in its active position, but when no color filter is placed in the light path the heat filter is in its inactive position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.