Small-sized electronic calculator

Details Small-sized electronic calculator Small-sized electronic calculator

1979-01-18

1981-04-28

Smith, Jerry

Boots, shoes, and leggings

136291, 364705, 364708, G06F 1502

Patent

active

042649625

ABSTRACT:
A small-sized electronic calculator, which comprises a power source in the form of a solar battery having a film of polycrystalline photoconductive material, such as selenium. The solar battery is connected for angular movement to the calculator body by suitable connection means, such as a hinge and a foldable metal spring. The calculator body includes a display section of liquid crystal elements. The solar battery may include an overvoltage preventing circuit and a reset switch. The output of the solar battery may be converted to a digital value to indicate the luminescent by the display section.

REFERENCES:
patent: 3940679 (1976-02-01), Brandwein et al.
patent: 4017725 (1977-04-01), Roen
patent: 4096577 (1978-06-01), Ferber et al.
patent: 4120036 (1978-10-01), Maeda et al.
patent: 4152535 (1979-05-01), Deminet et al.

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