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:
Feb. 22, 1977
Filed:
Nov. 07, 1975
Ronald Duane Elms, Chagrin Falls, OH (US);
Other;
Abstract
The method includes steps for and the apparatus includes means for determining the absolute position of a movable element mounted for movement along a path. The method includes the steps of: developing a pseudo random sequence of indicia which uniquely define the position of the movable element on the path; generating a pseudo random sequence of information bits which correspond to the indicia; reading the pattern of the N indicia at one particular position of the movable element on the path; cycling the generated pseudo random sequence until N bits thereof equal the pattern of N indicia at one particular position of the movable element on the path; and when equality is obtained, generating a logic signal indicating that the pseudo random sequence has been cycled to a position correlated to the absolute position of the movable element on the path. Preferably a counter is cycled in synchronism with the cycling of the pseudo random sequence so that when equality is obtained the counter will contain a number which is indicative of the absolute position of the movable element on the path. The apparatus includes electrical circuits for carrying out the method steps.