Electronic calculator with switches in solid V- and U-shaped groups
OwnerKwong-Li Louinventor
Life of this patent
Estimating the term…
Abstract
In a hand-operated electronic calculator, a switchboard having push-button switches for digits and symbols, every two or more switches combined into V, or U, or square shaped groups either above the surface or recessed for receiving fingertips and actuated along two or more directions. Switch groups are arranged at finger locations, each group of switches being assigned to a certain finger, two or more groups to active fingers, and a group can be at a perpendicular direction to the other four fingers for thumb operating.
Claims8
In a hand-held electronic calculator including a housing having a substantially planar top surface, a switchboard comprising:
- at least one solid group of push-button switches projecting above the top surface of said calculator housing for receiving a user's fingertip, said group including at least one upright push-button.
In a hand-held electronic calculator including a housing having a substantially planar top surface, a switchboard comprising:
- a plurality of groups of push-button switches projecting above the top surface of said calculator housing for receiving the user's fingertips, at least one of said groups including an upright push-button, said groups of push-button switches being distributed in a one-to-one correspondence with each finger location,
- whereby each finger can cover a corresponding group of push-buttons, active fingers can cover at least two groups, and inactive fingers can cover less used groups.
Dependencies are inferred from the claim text.