Alarm device for camera
US4688921A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1986 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Aug 8, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An alarm device for a camera provided with a stop control device for automatically controlling the stop of an objective lens mounted on the camera, and a photosensor for receiving an illumination light which has been radiated from a flash device to be electrically connected to the camera, reflected from an object and passed through the stop, the output of the photosensor being used for control of the light emission quantity of the flash device, includes: a lens discriminating unit for discriminating the type of the objective lens and outputting a first signal when an objective lens not suitable for an automatic stop control by the stop control device is mounted on the camera; a flash device detecting unit for generating a second signal upon detecting that the flash device is electrically connected to the camera and a flash light is permitted to be radiated; a judging unit including a unit for presetting a stop value of the objective lens and a unit for setting beforehand a limit stop value for a flash photography, the judging unit generating a third signal when the preset stop value exceeds the limit stop value; and an alarm unit for giving an alarm signal when the first, second an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.