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. 25, 2014
Filed:
Jan. 03, 2011
Min-ha an, Changwon, KR;
Hyong-su Choi, Changwon, KR;
Tae-young Lee, Changwon, KR;
Dong-ju Seok, Changwon, KR;
Min-ha An, Changwon, KR;
Hyong-su Choi, Changwon, KR;
Tae-young Lee, Changwon, KR;
Dong-ju Seok, Changwon, KR;
Samsung Techwin Co., Ltd., Changwon-city, KR;
Abstract
An encoder which measures displacement of a moving part includes a light-emitting unit; a moving part which moves relative to the light-emitting unit; a first pattern track which includes a plurality of first unit patterns sequentially formed on the moving part, separated from one another and having different widths; a first light-receiving unit which is disposed to correspond to the light-emitting unit and detects first information light received from the light-emitting unit via a first pattern of the first unit patterns; at least one second light-receiving unit which is disposed to correspond to the light-emitting unit and detects second information about light received from the light-emitting unit via at least one second pattern of the first unit patterns; and a displacement calculating unit which calculates a relative displacement of the moving part with respect to a reference position based on the first and second information.