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. 23, 2012
Filed:
Apr. 20, 2010
Yuzuru Yamakage, Kawasaki, JP;
Kazushi Uno, Kawasaki, JP;
Yasumasa Iwamura, Kawasaki, JP;
Hiroyasu Yoshikawa, Kawasaki, JP;
Koichi Tezuka, Kawasaki, JP;
Yuzuru Yamakage, Kawasaki, JP;
Kazushi Uno, Kawasaki, JP;
Yasumasa Iwamura, Kawasaki, JP;
Hiroyasu Yoshikawa, Kawasaki, JP;
Koichi Tezuka, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Provided is an objective lens for recording a hologram that condenses an recording beam on a hologram recording medium, and the objective lens is configured so as to condense, in the case where the recording beam is incident upon the objective lens in a form of a parallel beam flux, an on-axis beam flux and an off-axis beam flux contained in the parallel flux so as to form a beam waist in the hologram recording medium, and such that a distance between an off-axis image point of the off-axis beam flux that defines a largest field angle among the off-axis beam fluxes gradually converging ahead of the beam waist and the hologram recording medium becomes minimal.