Electronic calculator with no protruding key tops

Details Electronic calculator with no protruding key tops Electronic calculator with no protruding key tops

1977-10-17

1979-06-12

Smith, Jerry

Boots, shoes, and leggings

200 5A, 364707, 364709, G06F 1502, H01H 900

Patent

active

041582306

ABSTRACT:
The body of an electronic calculator comprising a keyboard, an arithmetic processor unit, a power supply and a digital display is accommodated within a casing at least a portion of which corresponding to the keyboard is made of a single flexible flat sheet such as cloth and leather. A plurality of limited regions of the flat sheet are given unique symbols and indicators corresponding to respective ones of keys of the keyboard by a printing technique for example, whereby the flexible flat sheet serving as manually operable key tops or actuators. When depressing a specific limited region of the key flat sheet, its associated elastomeric connector comes into contact with a comb shaped counter connector contact formed on a printed circuit board. Such an arrangement provides a keyboard with no protruding key tops for a totally new dimension in slimness and portability of calculators.

REFERENCES:
patent: 3627927 (1971-12-01), Schmitz et al.
patent: 3732389 (1973-05-01), Kaelin et al.
patent: 3955355 (1976-05-01), Luce
patent: 3995126 (1976-11-01), Larson
patent: 4035593 (1977-07-01), Riniker
patent: 4066851 (1978-01-01), White et al.

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