Operation setting device having stationary touch-sensitive control elements
First Claim
1. An operation setting device having stationary control keys, comprising transparent support means of insulating material defining two opposite faces, said keys including pairs of stationary contact strips made of an electrically conductive material secured to one of said faces;
- means for interconnecting said contact strips outside said support means to provide for variable groups of key elements;
means for releasing a switching function when said contacts in respective pairs are bridged by a lower electric resistance; and
an exchangeable visual identification plate arranged opposite the other face of said transparent support means to identify the function of respective control keys.
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Abstract
The operation setting device includes a keyboard having stationary control keys arranged on a transparent support plate of insulating material, each key of the keyboard being formed of a pair of transparent electrically conductive material secured to the outer face of the support plate and being connectable to a switching device sensitive to a change of resistance between the contacts in each pair. A visual identification card is located behind the support plate and having its indentification signs in register with respective keys.
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Citations
10 Claims
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1. An operation setting device having stationary control keys, comprising transparent support means of insulating material defining two opposite faces, said keys including pairs of stationary contact strips made of an electrically conductive material secured to one of said faces;
- means for interconnecting said contact strips outside said support means to provide for variable groups of key elements;
means for releasing a switching function when said contacts in respective pairs are bridged by a lower electric resistance; and
an exchangeable visual identification plate arranged opposite the other face of said transparent support means to identify the function of respective control keys. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
- means for interconnecting said contact strips outside said support means to provide for variable groups of key elements;
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2. A data entry and display unit comprising a display panel for visually indicated numeric, alphanumeric or graphic signs;
- a stationary keyboard arranged in front of said display panel, the keys of said keyboard being formed of a pair of transparent electrically conductive touch contacts connectable to a switching unit and responsive to the change of resistance between the contacts to release a switching function, said keyes being in register with assigned signs on said display panel and a key illumination device for selectively illuminating said signs in response to the actuation of said keys.
- View Dependent Claims (3)
Specification