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. 25, 1999
Filed:
Oct. 14, 1997
Tetsuro Kiriyama, Kawasaki, JP;
Mikiya Teraguchi, Kawasaki, JP;
Mitutoyo Corporation, Kawasaki, JP;
Abstract
An interpolation circuit of an encoder of which dynamic accuracy is improved is disclosed. The phase angle data detecting circuit 1 detects to store the phase angle data PH for each of the first clock CK1. The phase angle data PH is input to the updating circuit 2 in which the current data CNT is subtracted from the subsequent phase angle data PH so as to be updated. The differential data DX is limited within an upper limit to be added to the current data CNT. The integrating circuit 3 integrates the differential data DELTA1, whose upper limit is predetermined, by the second clock CK2 to generate the carry signal QUADEN at each timing when the integrated value leads to the period ratio of CK1 to CK2. The two-phase square wave generating circuit 5 generates two-phase square wave signals at each timing of the carry signal QUADEN. The over-speed detecting circuit 6 monitors the differential data DX to generate the over-speed alarm signal OSALM under a predetermined condition.