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:
Jun. 15, 2010
Filed:
Feb. 19, 2007
Hideaki Tamiya, Kanagawa, JP;
Hideaki Tamiya, Kanagawa, JP;
Mori Seiki Co., Ltd, Nara, JP;
Abstract
A displacement detection apparatus, polarization beam splitter, and diffraction grating are provided. A displacement detection apparatus configured to detect a displacement includes a light source, a reflective diffraction grating configured to receive the two polarized beams, two polarization altering elements configured to alter the polarization states of two diffracted beams of the two polarized beams obtained at the diffraction grating, two mirrors configured to reflect the beams whose polarization states have been altered at the two polarization altering elements and to guide the reflected beams to the two polarization altering elements, each of the mirrors corresponding to the polarization altering elements, and a polarization beam splitter provided as a unit with at least the two polarization altering elements, the polarization beam splitter including a polarizing and splitting surface and a transmissive area.