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US 4,281,917 AGranted
Information display device for camera
AssigneeOlympus Optical Co., Ltd.
InventorsMasahiro Kitagawa, Michiharu Saito
Life of this patent
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AssigneeOlympus Optical Co., Ltd.
InventorsMasahiro Kitagawa, Michiharu Saito
Estimating the term…
An information display device for a camera which comprises a power source, an information display circuit, a timer circuit, and switch means for operating the timer circuit to connect the information display circuit to the power source for a fixed time. The switch means includes a first switch which is turned on while being shifted from an OFF to ON position, a second switch connected in series with the first switch, and a third switch connected in parallel with the second switch and interlocking with the first switch. The third switch is so designed as to be turned on to operate the timer circuit while the first switch is shifted from the OFF to ON position and to be already turned OFF when the first switch is brought to the ON position. Preferably, the first and third switches are rotary switches with a common movable contact, and the second switch is a self-restoring switch, such as a push switch.
In an information display device for a camera, comprising a power source, an information display circuit, a timer circuit, and switch means for causing said timer circuit to connect said information display circuit to said power source for a predetermined period of time, said switch means comprising a first switch which is turned on while being shifted from an OFF position to an ON position, a second switch which is operated independently of the first switch and which renders said information display circuit operable only when the first switch is in ON state, and a third switch which is ganged with the first switch, said third switch being temporarily turned on while the first switch is being shifted from the OFF position to the ON position and turned off when the first switch reaches the ON position, thereby causing said timer circuit to connect said information display circuit to said power source for a predetermined period of time.
Dependencies are inferred from the claim text.