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:
Aug. 23, 2005
Filed:
Sep. 30, 2003
Gunichi Nakamura, Kanagawa, JP;
Mitsuru Ohno, Kanagawa, JP;
Gunichi Nakamura, Kanagawa, JP;
Mitsuru Ohno, Kanagawa, JP;
Sony Precision Technology Inc., Tokyo, JP;
Abstract
In a scale device including a scale unit () and detector (), the scale unit () includes a scale member () formed from a long material and having at least a pair of fixing holes () formed therein across a position signal carrying area () defined thereon and which carries position signals, and a case member () housing the scale member () therein and having formed therein a pair of fixing holes () through which there is inserted a fastening member () to be screwed into a mounting hole () formed in a stationary part () of a machine to which the scale device is to be installed. The detector () is fixed to a moving part () of the machine, which moves relative to the stationary part (), and includes a sensor () which moves oppositely to the position signal carrying area () on the scale member (). The scale unit () is fixed to the stationary part () with the scale member () and case member () being fastened together by the fastening member (). Thus, the scale member () different in linear expansion coefficient from the stationary part () can be installed to the latter with a high precision, and the scale device can make a measurement with a high accuracy, independently of environmental conditions.