Thickness detecting sensor

Details Thickness detecting sensor Thickness detecting sensor

2006-03-28

2006-03-28

Benson, Walter (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S658000, C324S661000

Reexamination Certificate

active

07019539

ABSTRACT:
A thickness detecting sensor can widely set a dynamic range for detecting the thickness of a medium, and exactly detect the thickness of the medium even when the dynamic range is widely set in this way. Therefore, the thickness detecting sensor has a fixing electrode and a movable electrode arranged so as to be opposed to each other, a plunger for changing the gap between the electrodes by coming in contact with the medium, and a CR oscillating circuit and an FV converting circuit for converting electrostatic capacity stored between the electrodes into an electric signal for detecting the thickness of the medium. The rear end portion of the plunger comes in contact with the electrode face of the gap side of the movable electrode. The movable electrode is displaced in the direction separated from the fixing electrode correspondingly to the thickness of the medium.

REFERENCES:
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patent: WO 97/22845 (1997-06-01), None
Patent Abstracts of Japan, publication no.: 07-119344; publication date Sep. 5, 1995; 1 page.
Patent Abstracts of Japan, Publication No. 2002-149337 dated May 24, 2002, 1 page.
European Search Report issued in EPO Application No. EP 04 00 8505 dated Jul. 21, 2004, 1 page.

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