Focus detector, and lens apparatus and image pickup apparatus including the same
US8848095B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 2012 |
| Grant date | Sep 30, 2014 |
| Priority date | — |
| Expiry date | Oct 12, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/36
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A focus detector for detecting a defocus amount of an image pickup optical system based on a displacement amount between two images formed by two beams divided from the image pickup optical system and passed through two pupil areas, the focus detector including: two lenses; two phase difference sensors for photoelectrically converting two subject images formed by the two lenses into two image signals; a correlation computing unit for dividing the two image signals based on a reference number-of-pixels to compute an image displacement amount for each divided area; a waveform coincidence computing unit for computing a coincidence degree of the two image signals in the each divided area in which the image displacement amount is computed by the correlation computing unit; and a defocus computing unit for computing a defocus amount based on the coincidence degree of the two image signals computed by the waveform coincidence computing unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.