Autofocus camera and optical device with variable focal length intended to be integrated into such a camera
US10261392B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 2015 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Dec 3, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2224/48091
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to an autofocus camera (1) comprising: —an image sensor (10), —an optical block (20) comprising a plurality of lenses with fixed focal length, —an optical device (30) with variable focal length comprising: •a deformable membrane (301), •a support (302) to which a peripheral anchoring area (301c) of said membrane is connected, •a cavity (303) filled with a constant volume of fluid, said cavity being delimited at least in part by said membrane (301) and a support wall (302), •an actuation device (304) of a region (301b) of the membrane located between the peripheral anchoring area (301c) and a central part (301a) of the membrane, configured to bend by application of electrical actuation voltage so as to displace some of the fluid volume towards the center or towards the periphery of the cavity (303), wherein at least one region distinct from the central part (301a) and of the actuation region (301b) of the membrane is stressed mechanically permanently so as to cause permanent deformation of the central part of the membrane by the fluid, the focal distance of the optical device (30) at rest under the effect of said mechanical stress being different from the focal…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.