G - Physics – 06 – F
Patent
G - Physics
06
F
354/236
G06F 3/14 (2006.01) G03B 21/132 (2006.01) G06F 15/02 (2006.01) G09B 5/00 (2006.01)
Patent
CA 2023562
206P Abstract of the Disclosure A hand-held calculator has a transparent window carrying a liquid crystal display as well as transparent number and function key locations such that when placed on an overhead projector, the calculator can be used to demonstrate to a classroom of students all operations performed in a sequence of mathematical operations. The plastic casing of the calculator has one or more small holes passing through the casing at corners, so that a string or line can be used to tether the calculator to the overhead projector, preventing damage to the calculator from a fall to the floor. Another feature of the calculator is an improved keyboard of relatively small domain size for each key, with a spacer grid on the back surface of the keyboard membrane panel overlay element, effective to provide pressure isolation of an active key from adjacent keys and also to prevent other pressures on the keyboard from causing mistaken entries. A further feature of the calculator is a protrusion or foot at each corner of the back of the calculator casing, for holding the back surface of the calculator slightly above the light platform of the overhead projector, for cooling of the liquid crystal display by air passing between the light table and calculator. Finally, the calculator in a preferred embodiment has a plurality of different background colors for different groups of the transparent function keys, so that in following the operations of the calculator on the screen, the observer can more quickly identify a function by association with the color group in which the instructor's finger appears in carrying out the calculation.
Smart & Biggar
Stokes William T.
LandOfFree
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