Keyboard-equipped apparatus such as an electronic calculator wit

Details Keyboard-equipped apparatus such as an electronic calculator wit Keyboard-equipped apparatus such as an electronic calculator wit

1984-05-29

1985-08-06

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307126, 307140, 307594, 307585, H01H 300, H03K 1722

Patent

active

045338370

ABSTRACT:
A power throw circuit is provided within a keyboard-equipped apparatus such as an electronic calculator, an electronic timepiece etc. for determining whether a battery or batteries are connected between supply terminals therefor, whereby a power supply controller is not enabled to disconnect said power supply unless a power throw detection signal is developed from the power throw circuit. In response to the occurrence of the power throw detection signal from the power throw circuit power energy is automatically supplied from the power source to a power utilization circuit. In a preferred form, once the power utilization circuit has been enabled, and placed into the stable condition, the power throw detection circuit will no longer have any influence on the utilization circuit. In such stable conditions, the subsequent actuations of any key of a keyboard can control the power supply from the power source to the power utilization circuit. In another preferred form, the power throw circuit continuously provides the supply of power from the power source to the power utilization circuit without regard to the actuation of any key on the keyboard.

REFERENCES:
patent: 3760192 (1973-09-01), Darrow
patent: 4024415 (1977-05-01), Matsuura
patent: 4029996 (1977-06-01), Miffitt
patent: 4119864 (1978-10-01), Petrizio
patent: 4140930 (1979-02-01), Tanaka
patent: 4257117 (1981-03-01), Besson
patent: 4322631 (1982-03-01), Spofford

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