Input device and electronic appliance using the same
First Claim
1. An input device for use with a power source comprising:
- a power transformer connected to said power source, a ground current detection circuit coupled to a secondary side circuit of said power transformer, said ground current detection circuit for issuing a signal when magnitude of ground current received thereby is above a threshold level, impedence elements connected between said ground current detection circuit and the primary side circuit of said power transformer, an operation unit having one or more electrodes disposed at least on the top of a base material made of insulating material connected to said ground current detection circuit electrically, and for transmitting ground current having magnitude above said threshold to said ground current detection circuit when, as a result of touching said input device, ground current above said threshold level flows therethrough.
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Accused Products
Abstract
A touch type input device is used for various forms of control. A primary side line is connected to a power source, and a secondary side circuit ground through a power transformer are connected by an impedance element. Flat electrodes to be touched by a finger are formed on one side of an insulating base material, and are connected to a ground current detection circuit through a high resistor and a low pass filter. A control circuit for converting the output of the ground current detection circuit into a control signal for an electronic appliance, and a display unit are provided. Therefore, an input device having plural touch switches disposed on a base material in a free shape and layout can be obtained.
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Citations
24 Claims
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1. An input device for use with a power source comprising:
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a power transformer connected to said power source, a ground current detection circuit coupled to a secondary side circuit of said power transformer, said ground current detection circuit for issuing a signal when magnitude of ground current received thereby is above a threshold level, impedence elements connected between said ground current detection circuit and the primary side circuit of said power transformer, an operation unit having one or more electrodes disposed at least on the top of a base material made of insulating material connected to said ground current detection circuit electrically, and for transmitting ground current having magnitude above said threshold to said ground current detection circuit when, as a result of touching said input device, ground current above said threshold level flows therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification