Multiple pass optical rotary joint
US4725116A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1985 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Sep 16, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/3604
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a multiple pass optical rotary joint which can simultaneously transmit optical signals along two or more channels in either of two directions. The joint uses a rotor and a stator to each of which is connected a plurality of optical fibers. Within the joint reflecting mirrors are used to redirect off-axis optical signals onto the joint axis, with relative rotation occurring while the signals are on-axis. A rotating member for each channel has a mirror for reflecting the on-axis signal portion off-axis to a receptor fiber. Alignment between the rotating member and the receptor fiber, as well as drive for the rotating member, is provided by a pair of magnets of opposite polarity, one being secured to the rotating member and the other being secured to the rotor. The magnetic interaction ensures synchronous rotation of the rotor and the rotating member. Specific embodiments in which transmission losses can be minimized are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.