Electrical isolation of endoscopic video camera
US5913817A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1997 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Aug 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/555
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video camera isolation system and method for use with video cameras that are coupled to endoscopes that utilize simple pulse transformer technology to isolate the video camera head from the video processing circuitry allowing the processing circuitry to be referenced to ground. The video signal from the CCD sensor in the camera head is specifically processed to prevent shutter pulses from interfering with the isolated video signal. Special circuitry blanks the shutter pulse from the pulse transformer. Timing errors due to cable length delays are corrected by means of a pilot signal which correlates with the CCD output signal. Open collector data circuitry is also specially processed by dual channel detecting and amplifying circuits which are transistor switched through the pulse transformers before being delivered to and from the camera head. Timing pulses are processed through logic buffering conditioning circuitry and pulse transformers for reconstruction on the secondary of the pulse transformer by hysteresis buffers. Cable delay compensating is provided by pilot pulse received from a CCD driver that is applied to a correlated double sampling pulse generator having an output t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.