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. 15, 2005
Filed:
Jan. 15, 2004
Yasuhiro Yoritsune, Okayama, JP;
Kenji Kataoka, Okayama, JP;
Yasuhiro Yoritsune, Okayama, JP;
Kenji Kataoka, Okayama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A rotary encoder has housing case provided with common electrode and signal electrode disposed to an area narrower than the entire circumference, or an angular range of generally ½ of the circumference in concentrical with central hole of housing case, and sliding contact in a confronting manner to the electrodes, the sliding contact provided with four combinations of contacts points arranged at four equally divided angular positions, or every 90 degrees along the same circumference about the rotary axis, each of the combinations comprises contact point on inner side for connectively sliding on common electrode and two contact points on outer side for connectively sliding on signal electrode. The rotary encoder of this structure can reduce the cost by decreasing a width of material needed for fabrication of electrodes, and decrease distances for contact points to slide on electrodes, to thereby improve durability to sliding abrasion.