The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 29, 1988
Filed:
Oct. 09, 1987
Kouji Sasaki, Kanagawa, JP;
Mitutoyo Mfg. Co., Ltd., Tokyo, JP;
Abstract
An electrostatic capacity type encoder which includes a rotary disk rotatingly provided on an encoder body, and a first stationary disk and a second stationary disk fixed to the encoder body to face each other with the rotary disk arranged therebetween. A plurality of transmitting electrodes are provided on the first stationary disk. On the rotary disk is provided not only a plurality of receiving electrodes facing the transmitting electrodes on the first stationary disk but also a coupling electrode connected to the receiving electrodes and facing the second stationary disk. An output electrode is provided on the second stationary disk to face the coupling electrode on the rotary disk. To the respective transmitting electrodes are applied alternating currents with respective different phases, and the amount of rotating displacement in the rotary disk is detected in accordance with the output signal from the output electrode which changes with the rotation of the rotary disk.