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:
May. 16, 2006
Filed:
Apr. 11, 2003
Takashi Okamuro, Tokyo, JP;
Hirokazu Sakuma, Tokyo, JP;
Takashi Okamuro, Tokyo, JP;
Hirokazu Sakuma, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A rotary type encoder is provided with a signal generating portionfor generating a sine wave signal of N periods for each revolution in accordance with the rotation of the shaftof a motor; a calculation means for obtaining the rotation angle of the shaftbased on the sine wave signal; an EEPROMbeing arranged in a manner that the error value of the rotation angle for one revolution of the shaftthus measured is divided in relation with the N periods to set a plurality of first angle regions i, the angle region almost at the center of the angle region i is divided into plural regions to set second angle regions j, and an error value corresponding to the angle at almost the center of each of the angle regions j is stored therein in correspondence with the rotation angle; and a correction means for reading the error value stored in the EEPROMin correspondence with the rotation angle to correct the rotation angle.