Portable electronic device equipped with calculation and timekee

Details Portable electronic device equipped with calculation and timekee Portable electronic device equipped with calculation and timekee

1979-07-09

1981-05-05

Smith, Jerry

Boots, shoes, and leggings

340365E, 340365S, 364707, 364709, 368 10, G06F 302, G06F 1502, G04B 4700

Patent

active

042662788

ABSTRACT:
A portable electronic device with calculation and timekeeping functions, equipped with a keyboard for calculation and time setting purposes, means for producing scanning signals when a key is actuated, these signals being applied to switching elements connected to rows of keyboard contacts. When a key is depressed, the resultant high level signal potential applied to the corresponding contact row causes the row position to be detected and stored in a first memory circuit, which produces a signal causing the corresponding contact column to be detected and stored in a second memory circuit. Actuation of an external control member causes a signal to be stored by a reset signal in a first stage memory circuit which produces an output signal to be subsequently stored in a second stage memory circuit in synchronism with a timing signal. The low frequency and low duty cycle of the scanning signals and reset signal ensure minimized power consumption and suppression of switch bounce effects.

REFERENCES:
patent: 3764997 (1973-10-01), Hatano et al.
patent: 3987437 (1976-10-01), Hatsukano et al.
patent: 4041295 (1977-08-01), Ido et al.
patent: 4094135 (1978-06-01), Nomura et al.
patent: 4106011 (1978-08-01), Melanson et al.
patent: 4109315 (1978-08-01), Pan
patent: 4117758 (1978-10-01), Osburn et al.

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