1989-02-09
1990-05-01
Hix, L. T.
354286, G03B 726
Patent
active
049222830
ABSTRACT:
An optical instrument system has an optical instrument body and an optical accessory instrument. The optical instrument body is capable of accommodating an electric power source and includes a supply circuit for supplying an electric power from the electric power source and a body side circuit for performing digital information communication. The optical accessory instrument is attachable to and detachable from the optical instrument body and includes an electric power receiving circuit for receiving an electric power from the supply circuit when attached to the optical instrument body, an accessory side circuit for performing digital information communication with the body side circuit, the accessory side circuit being arranged to change over between a first state of consumption of electric current and a second state of a lower consumption of electric current than in the first state, and a control circuit for controlling the state concerning the consumption of electric current of the accessory side circuit, the control circuit being arranged to change the state from the second state to the first state after a digital communication has been performed between the body side circuit and the accessory side circuit when the electric power has been supplied to the accessory side circuit.
REFERENCES:
patent: 4453812 (1984-06-01), Suzuki et al.
patent: 4509846 (1985-04-01), Nakai et al.
patent: 4647175 (1987-03-01), Bletz et al.
Brown Brian W.
Canon Kabushiki Kaisha
Hix L. T,.
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