Exposure indicating device
US4077043A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1976 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Jul 28, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exposure indicating device for use in a photographic camera which includes a light measuring circuit for generating an output representative of scene brightness, a reference voltage circuit for producing reference voltage, a first switching circuit and a second switching circuit receiving the outputs of the light measuring and reference voltage circuits, and indicating means responsive to outputs of the first and second switching circuits. The indicating device indicates that automatically controlled exposure factor, i.e., shutter speed or diaphragm aperture, will be higher or lower with respect to more than one standards, without any change-over of switches. For example, this device indicates that shutter speed to be effected automatically will be in any of blur occurring range, available range and upper outside range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.