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:
Oct. 03, 2000
Filed:
Apr. 06, 1999
Applicant:
Inventor:
Asahiko Nogami, Tokyo, JP;
Assignee:
Sony Precision Technology Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356358 ; 356345 ; 356346 ;
Abstract
The displacement measuring apparatus of a laser interference technology includes a probe 3 which delivers at a photodetector 17 an RF signal of which a modulated component proportional to a displacement of an object 2 under measurement. The apparatus has also a phase-demodulation circuit 9 in which an interference signal produced by shifting the frequency of the RF signal to an intermediate frequency is phase-demodulated on the basis of the carrier signal for supply to a light modulator 16. Thus the apparatus can detect a displacement of the object with a high resolution.