Light source device for endoscopes
US5823943A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1995 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Aug 1, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B1/0669
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A light source device for endoscopes includes a light source for emitting white light containing the components of light belonging to a visible region and wavelength bands other than the visible region; at least, a rotary color separating filter on a field sequential system; and an infrared cutoff filter for blocking light in an infrared region, of a wavelength band of the white light. When the rotary color separating filter is disposed in an optical path from the light source to a light guide, an interference filter in which an interference film is applied to a transparent base plate is placed in the optical path. This arrangement obviates the defect of burning the entrance end of the light guide or of breaking the infrared cutoff filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.