US Patent 7353618 Magnetic scale

Patent 7353618 was granted and assigned to Sony on April, 2008 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Sony

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7353618

Date of Patent

April 8, 2008

Patent Application Number

11391036

Date Filed

March 28, 2006

Patent Primary Examiner

‌

Christopher W Fulton

Patent abstract

A magnetic scale includes a pipe and a polarizable magnetic member closely attached to the inner surface of the pipe so as to extend in the longitudinal direction of the pipe. The magnetic member is formed with magnetic marks provided by a plurality of N poles and S poles alternately arranged in the longitudinal direction of the magnetic member. Accordingly, the magnetic member can be reliably protected to thereby improve its durability.