Three dimensional reflex lens systems
US4878744A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1987 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Jun 26, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/218
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Optical system for use with attachments for a conventional reflex motion picture camera to permit stereographic cinematography are disclosed. The optical systems include lens systems having four powered elements having negative, positive, negative, and positive focal lengths respectively. The lens systems are adapted to be used with the Bernier stereographic cinematography attachment system as modified for reflex motion cameras. The lens systems include a normal lens system, a wide angle lens system, and a telephoto lens system. The wide angle lens system further includes plane parallel refractive elements to increase its overall length without changing its back focal length, and the telephoto lens system is adapted to be used with internal displacement prisms which bring the images produced by the telephoto lens system into the camera flange opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.