Invention Grant
US07952776B2 Hologram reading apparatus, hologram reading method, hologram recording apparatus and hologram recording method
有权
全息读取装置,全息读取方法,全息记录装置和全息记录方法
- Patent Title: Hologram reading apparatus, hologram reading method, hologram recording apparatus and hologram recording method
- Patent Title (中): 全息读取装置,全息读取方法,全息记录装置和全息记录方法
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Application No.: US12112007Application Date: 2008-04-30
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Publication No.: US07952776B2Publication Date: 2011-05-31
- Inventor: Yasuhiro Ogasawara
- Applicant: Yasuhiro Ogasawara
- Applicant Address: JP Tokyo
- Assignee: Fuji Xerox Co., Ltd.
- Current Assignee: Fuji Xerox Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2007-224488 20070830
- Main IPC: G02B5/32
- IPC: G02B5/32

Abstract:
A hologram reading apparatus includes: a unit for holding a hologram recording medium in which data page is recorded by irradiating as a single beam both reference light and signal light modulated by a spatial light modulator including a first pixel area for modulating the reference light and a second pixel area for modulating the signal light, a direction of an arrangement period of pixels in the first pixel area being different from that in the second pixel area; a Fourier transform lens subjecting reproduction light to a Fourier transformation; a filter disposed shielding the reference light at a first spatial frequency band and transmitting the signal light at a second spatial frequency band; and a unit for receiving the reproduction light and reading the data page modulated to the signal light included in the reproduction light.
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