Real-time light-measuring system for single-lens reflex cameras
US4635125A · kind A · utility
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5Claims
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Key dates
| Filing date | Apr 17, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Apr 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/09972
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light-measuring system for single-lens reflex cameras wherein the light coming from an object to be photographed as reflected at the image-pickup surface is reflected once again by a partially reflecting means disposed in the photographing light path, so that this latter reflection light is measured on its own optical axis, to enable to perform the real-time measurement of light with a high precision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.