Imaging device for endoscope equipped with both NTSC system and PAL system
US6476852B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1999 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Jun 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/555
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An imaging device for an endoscope which can restrain the flicker of a screen caused when converting the television system, and furthermore, which makes it possible to unify processor circuits performing the processing of different systems. Having an NTSC system oscillator and a PAL oscillator with an oscillating frequency of N·fh2, and a switching device for selecting them in a scope equipped with a CCD suitable for the number of scanning lines, for example, of the NTSC system, and it drives the CCD on the basis of a timing signal formed in each of the selected oscillators. That is, when the PAL system is selected, the picture data is taken out from the CCD by a horizontal synchronization signal with a frequency of 15.625 kHz (fh2), and in a memory section on the processor side, write-in and read-out of the picture data are also performed by a horizontal synchronization signal with this frequency fh2, and therefore, difference between the write-in speed and the read-out speed becomes small, and the flicker of a screen is restrained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.