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. 21, 2011
Filed:
Sep. 13, 2006
Atsushi Fukumoto, Kanagawa, JP;
Mikio Sugiki, Kanagawa, JP;
Kenji Tanaka, Tokyo, JP;
Naoto Kojima, Kanagawa, JP;
Mitsuru Toishi, Tokyo, JP;
Atsushi Fukumoto, Kanagawa, JP;
Mikio Sugiki, Kanagawa, JP;
Kenji Tanaka, Tokyo, JP;
Naoto Kojima, Kanagawa, JP;
Mitsuru Toishi, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A hologram recording/reproducing device includes a recording/reproducing optical unit performing recording and reproducing operations on a hologram recording/reproducing medium. The optical unit includes a laser light source emitting laser light; a spatial-light modulator generating signal light and reference light from the laser light, the signal light and reference light having a common light path; a phase mask disposed near the modulator or in a conjugate plane of the modulator and transmitting at least the reference light; and an objective lens including a first lens portion and a second lens portion. The first lens portion is disposed at an inner peripheral portion of the objective lens and serves as a Fourier transformation lens focusing the signal light to a predetermined point. The second lens portion is disposed at an outer peripheral portion of the objective lens and has focuses continuously or discretely disposed in an optical-axis direction of the objective lens and at portions in the medium near the predetermined point.