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:
Mar. 01, 2005
Filed:
Mar. 18, 2002
Satoru Tanaka, Tsurugashima, JP;
Hajime Matsushita, Tsurugashima, JP;
Yoshihisa Itoh, Tsurugashima, JP;
Tomomitsu Kouno, Tsurugashima, JP;
Hideki Hatano, Tsurugashima, JP;
Satoru Tanaka, Tsurugashima, JP;
Hajime Matsushita, Tsurugashima, JP;
Yoshihisa Itoh, Tsurugashima, JP;
Tomomitsu Kouno, Tsurugashima, JP;
Hideki Hatano, Tsurugashima, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
In a hologram recording method for forming a plurality of areas of a refractive index light interference pattern of a coherent signal light beam in accordance with information data within a recording medium having a shape of parallel flat plates, the signal light beam and the recording reference light beam cross each other within the recording medium, and a gate light beam having a second wavelength for revealing recording sensitivity of the recording medium is simultaneously irradiated to the recording medium so as to pass through a portion of the recording reference light beam and demarcate a volume smaller than that of this crossing portion.