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:
Nov. 01, 1994
Filed:
Aug. 12, 1992
Tamiki Tekemori, Hamamatsu, JP;
Yuji Kobayashi, Hamamatsu, JP;
Hamamatsu Photonics K.K., Shizuoka, JP;
Abstract
An optical displacement measuring apparatus of the present invention optically measures a displacement amount of an object. The apparatus includes: image forming means for forming an image indicative of the displacement amount of the object achieved between first and second timings; first modulating means for modulating coherent light in accordance with the image; first Fourier transform means for subjecting the coherent light modulated by said first modulating means to Fourier transformation to thereby form a first Fourier image; second modulating means for modulating coherent light in accordance with the first Fourier image; second Fourier transform means for subjecting the coherent light modulated by said second modulating means to Fourier transformation to thereby form a second Fourier image; detecting means for detecting peak position of the second Fourier image indicative of the displacement amount of the object between the first and second timings; and time interval adjusting means for adjusting a time interval defined between the first and second timings.