Camera, optical system and interchangeable lens with birefringent device

US9939572B2 · kind B2 · utility

Assignee

• SONY GROUP CORPORATION · JP

Inventors

• Christin Weichelt · Esslingen am Neckar, DE
• Markus Kamm · Karlsruhe, DE

Key dates

• Filing date: Mar 13, 2017
• Grant date: Apr 10, 2018
• Expiry date: Mar 13, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/13439
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical system (110) includes a lens unit (112) with a plurality of lenses. An out-of-focus point spread function of the lens unit (112) includes an annular intensity distribution with at least one ring-shaped side peak at a radial distance to a center point. A birefringent device (115) in an optical path of the optical system (110) is adapted to selectively attenuate the ring-shaped side peak in the out-of-focus point spread function of the lens unit (112).