Title: Electric shutter means with battery checking circuit

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Claims: We claim:

1. An electric shutter means comprising an exposure time control circuit including an electromagnet for controlling the movement of closing shutter blades, a voltage checking circuit connected to said exposure time control circuit, a power source battery connected to said exposure time control circuit and voltage checking circuit, a power source switch connected between power source battery and said circuits and capable of simultaneously bringing said exposure time control circuit and voltage checking circuit into an operating condition, and interrupting means responsive to a checking signal issued from said voltage checking circuit when the voltage of said power source battery has dropped to be below a predetermined level for forcibly interrupting the passage of electricity to said electromagnet.

2. An electric shutter means according to claim 1, in which said voltage checking circuit includes an indicating lamp and a constant voltage element.

3. An electric shutter means according to claim 1, in which said voltage checking circuit includes a luminous diode and a variable resistor connected to said luminous diode.

Other info:

Inventors: Inoue, Nobuyoshi (Kawagoe, JA)
Namioka, Kenta (Tokyo, JA)

Application Number: 574942
Filing Date: 1975-05-06
Publication_date: 1976-03-30
Assignee: Copal Company Limited (Tokyo, JA)
Primary Class(es): 396/255 396/279
Other Classes:
US Patent Ref:

3646859	Mar, 1972	Umenura	354/60.
3661062	May, 1972	Wisst	354/60.
3812504	May, 1974	Wagensonner et al.	354/60.

Other Refs:
Primary Examiner: Hix, L. T.
Assistant Examiner: LaBarre, James
Attorney: Cushman, Darby & Cushman