Automatic hand-held photographic light meters

Details Automatic hand-held photographic light meters Automatic hand-held photographic light meters

1986-03-17

1987-01-13

Perkey, William B.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

354420, 34087002, 34087016, 34087028, 356218, G03B 700, G08C 1936, G01J 142

Patent

active

046360522

ABSTRACT:
Hand-held photographic light meters which may be of either the incident light or the spot variety are equipped with means of transmitting the light intensity measured to a suitably equipped automatic camera by means of a modulated beam of infra-red radiation. In this way the camera is set accurately regardless of the reflectance of the subject. Continuous or flash or a mixture of the two lights may be used. The camera has to be modified to receive the infra-red radiation in Type A of the invention while in Type B a special receiving unit which mounts on the hot-shoe is used to give a less flexible performance. More than one camera may be set simultaneously and most of the features of the automatic camera are retained.

REFERENCES:
patent: 4036762 (1977-07-01), Troetscher et al.
patent: 4239356 (1980-12-01), Freudenschuss et al.
patent: 4284338 (1981-08-01), Ikuno
patent: 4304472 (1981-12-01), Shinoda et al.
patent: 4310228 (1982-01-01), Terada
Electronic Integrated Circuits and Systems, Franklin C. Fitchen, _Electrical Engineering Department, South Dakota State Univ.

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