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:
Dec. 08, 1992
Filed:
Jan. 30, 1991
Jun Shibata, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
An optical heterodyne interference type detecting apparatus for measuring a displacement characteristic of a workpiece, including a device for applying a controlled physical quantity to the workpiece to induce a displacement of the workpiece, an optical heterodyne interference type displacement detecting device for detecting a difference in one of a frequency and a phase between a measuring light beam reflected by the portion of the workpiece and a reference light beam, and thereby detecting an amount of the displacement of the workpiece, and an arithmetic and control device for obtaining the displacement characteristic of the workpiece, based on the physical quantity and the amount of displacement detected by the displacement detecting device.
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