Autofocus adapter
US7848630B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2007 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Nov 10, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An autofocus adapter is provided and includes an imaging adapter optical system placed on an optical axis of an imaging lens when the autofocus adapter is attached, and a focus state detection adapter optical system placed on an optical axis different from the optical axis of the imaging lens when the autofocus adapter is attached. The imaging adapter optical system has a light split prism for splitting subject light passing through the imaging lens into imaging subject light and the focus state detection subject light, a first lens group having a negative power as a whole and placed on the object side with respect to the light split prism, and a second lens group having a positive power as a whole and placed on the image side with respect to the light split prism. The focus state detection adapter optical system has a positive lens group having the same lens configuration as the second lens group in the imaging adapter optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.