Objective for a movie camera
US6717742B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2003 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | Mar 31, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B3/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An objective for a movie camera for digital cinematography comprises a cylindrical main barrel with a bayonet or K mount, an inner tube, fixed optical elements, adjustable optical sliding elements and drive rings with scales for adjusting the optical sliding elements that are mounted rotatably in the axial direction on the main barrel. The objective also comprises an iris diaphragm with a diaphragm ring rotating on the main barrel, an internal focusing system and a back focus correction device. The inner tube is mounted on the main barrel in a fashion displaceable along the optical axis for the purpose of back focus correction by means of the back focus correction device. The fixed optical elements, the iris diaphragm and sliding holders for holding the adjustable optical sliding elements are inserted into the inner tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.