1981-09-28
1984-10-02
Perkey, William B.
354418, 354484, G03B 716, G03B 1505
Patent
active
044744501
ABSTRACT:
A system and method for adapting a multi-purpose electronic flash for use with an automatic exposure control camera is disclosed. The system responds to a ready signal from the multi-purpose flash and a reference signal from the automatic exposure control camera by providing a signal representative of the correct aperture for a given film speed (ASA) and range of flash to subject distances. Film speed is provided to the system by setting one portion of a variable resistance, while range is provided to the system by setting another portion of the variable resistance which is associated with a graded density optical filter located in front of the photosensor. A bipolar range about the reference signal is established to permit positive or negative signal excursions about the reference signal for indication of correct aperture. A scaling amplifier may also be provided for signal conditioning to ensure compatibility with the camera. The scaling amplifier may be arranged to provide less than unity amplification, thereby reducing system error. A special housing connects between the foot of the flash and the camera to provide access to the camera accessory shoe terminals and also to permit the flash to be operated on or off the camera. Various alternatives are disclosed.
REFERENCES:
patent: 3614918 (1971-10-01), Henniu et al.
patent: 3769888 (1973-11-01), Quinn
patent: 3846806 (1974-11-01), Yata et al.
patent: 4021824 (1977-05-01), Uchiyama et al.
patent: 4078242 (1978-03-01), Uchiyama et al.
patent: 4095242 (1978-06-01), Tsunekawa et al.
patent: 4311372 (1982-01-01), Gahler
Perkey William B.
Vivitar Corporation
LandOfFree
Camera to flash adapter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Camera to flash adapter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera to flash adapter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-524529