1989-05-23
1991-09-17
Perkey, W. B.
G03B 726
Patent
active
050499173
ABSTRACT:
There is disclosed a camera system consisting of accessories such as a speed light, a data back etc. and a camera capable of mounting these accessories, and capable of data communication between the camera and the accessory. When the power supply of the camera is turned off, a power supply activating signal is sent as a hardware signal from the accessory to the camera by the manipulation of the accessory. When the power supply of the camera is turned on, a power supply extending signal is sent as a software signal from the accessory to the camera by the manipulation of the accessory. The camera holds the operation of the power supply for a predetermined period from the latest entry of the power supply activation signal or the power supply extending signal.
REFERENCES:
patent: 4695148 (1987-09-01), Terui et al.
patent: 4924251 (1990-05-01), Ishimura et al.
Goto Tetsuro
Saegusa Takashi
Wakabayashi Tsutomu
Yasukawa Seiichi
Yokonuma Norikazu
Nikon Corporation
Perkey W. B.
Spyrou Cassandra C.
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