Object detection sensor

Details Object detection sensor Object detection sensor

2006-12-26

2006-12-26

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S536000, C340S436000, C340S437000, C340S438000, C340S552000, C341S033000, C200S600000, C200S181000, C200S061440, C200S061420

Reexamination Certificate

active

07154393

ABSTRACT:
An object detection sensor wherein a detection electrode (electrode connected with a detection circuit via a conductor) is not exposed from a surface and an input signal is scarcely reduced when a contact area is small, which is capable of reliably detecting a contact thereof with an object in a manner substantially the same as that in the case of a large contact area even when the contact area is small is provided. The object detection sensor is provided with a sensor case made from an insulating material, a detection electrode (electrode A) disposed on an inner surface of the sensor case, a touch electrode (touch electrode A) disposed at a position opposed to the detection electrode on an outer surface of the sensor case and capacitance-coupled to the detection electrode, and a detection circuit which is connected to the detection electrode and detects a contact of an object with the touch electrode based on a change in electrostatic capacitance between the detection electrode and the ground to output a detection signal.

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