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:
Sep. 27, 2005
Filed:
Apr. 07, 2004
Yoshinori Ito, Nagano-ken, JP;
Sadaharu Kanamori, Nagano-ken, JP;
Muneo Mitamura, Nagano-ken, JP;
Harmonic Drive Systems, Inc., Tokyo, JP;
Abstract
In an encoder signal interpolation divider () that automatically corrects errors in the offset and gain of an input signal at a high speed with a low cost circuit configuration, and can accurately generate an encoder signal having a predetermined resolution by interpolation division, analog input signals (A, B) are subjected to offset correction by a 0-point correction circuit () in adders () prior to being digitally converted by A/D converters (), and are subjected to gain correction by an amplitude correction circuit () in amplifiers (). The corrected analog signals are converted to digital values, angle data is calculated in an angle data lookup table (), and, based on these results, an encoder pulse signal having a predetermined resolution is generated and output from an encoder pulse signal generating circuit ().