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:
Apr. 01, 2003
Filed:
Jun. 16, 2000
Kazuo Aoki, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The invention provides a cutting step of a polarization beam separating material less susceptible to cutting position slipping. In particular, the present invention relates to a method for manufacturing a polarization beam splitter for splitting an incident beam into two types of linearly polarized beams. A laminate is constructed by gluing a plurality of substrates, at least some of which have a polarization beam separating film on one surface thereof. The planar laminate of the substrate is cut at a predetermined angle to the surface thereof to form a generally planar polarization beam splitter block in which a plurality of prisms are glued, each having a parallelogrammatic shape in cross section. A rectangular parallelepiped polarization beam splitter is thus formed by cutting away a prism portion having a generally trapezoidal shape in cross section from at least one end portion of the polarization beam splitter block. The width across the top surface of the generally trapezoidal form of the cross section of the cut portion is set to be larger than half the width of a toothed blade.