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. 18, 2002
Filed:
Jun. 27, 2000
Kazufumi Ishibashi, Kanagawa, JP;
Tetsuo Hattori, Kanagawa, JP;
Kiyoshi Numazaki, Kanagawa, JP;
Yasuhiro Iwaguchi, Kanagawa, JP;
Shuichi Sugai, Kanagawa, JP;
Tadaaki Nakamura, Kanagawa, JP;
Masaaki Kusano, Kanagawa, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A cross dichroic prism comprises four triangular prisms having isosceles right triangular cross sections identical in shape, opposing side faces thereof being bonded and secured together with rectangular portions thereof facing each other; and a dichroic film having an X-shaped cross section formed between the bonding faces of the triangular prisms; wherein, of the four triangular prisms, a given prism and at least one of the prisms adjacent thereto have a refractive index difference therebetween of 0.00005 or less, and the remaining two prisms opposed thereto have a refractive index difference therebetween of 0.00005 or less.