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Holographic memory device

A technology of holographic storage and rotating position, which is applied in information storage, recorded information storage, static storage, etc., and can solve the problems of not being able to obtain recurring signals and not being able to suppress

Inactive Publication Date: 2007-08-15
SANYO ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this vector component cannot be suppressed by controlling the reference light actuator alone
In this case, even when the reference light actuator is controlled, the angle between the interference fringes and the reference light is different from that during recording so that a proper reproduced signal cannot be obtained

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0034] FIG. 1 shows an optical system of a holographic storage device according to Embodiment 1 of the present invention. When information is recorded / reproduced in the transmission type holographic storage device 10, the optical system shown in FIG. 1 is used.

[0035] As shown in Figure 1, this optical system includes a semiconductor laser 101, a collimator lens 102, an optical gate 103, a beam splitter 104, an optical gate 105, a polarization beam splitter 106, a λ / 4 wave plate 107, and a spatial light modulator 108 , a Fourier transform lens 109 , a current mirror 110 , a relay lens 111 , a Fourier transform lens 112 and a CMOS (complementary MOS) image sensor 113 .

[0036] The semiconductor laser 101 emits laser light having a wavelength suitable for the holographic memory 10 . The collimator lens 102 converts the laser light incident from the semiconductor laser 101 into parallel light. The shutter 103 includes a mechanical shutter or the like, and passes / blocks laser...

Embodiment 2

[0086] According to Embodiment 1 of the present invention, the SNR of the reproduced signal is actually calculated, and the disk peripheral direction position of the holographic memory 10 is set at the position of the optimum NSR of the reproduced signal. However, according to this embodiment, the amount of inclination of holographic memory 10 is detected by the inclination detector, and based on the detected amount of inclination, the disc peripheral direction position of holographic memory 10 is set at a position where an error in inclination can be suppressed. According to this embodiment, as in the case of Embodiment 1 of the present invention, it is assumed that data light and reference light are incident on holographic memory 10 in a tangential direction.

[0087] According to this embodiment, a table in which the amount of inclination in the radial direction of the holographic memory 10 is associated with the amount of correction in the disc peripheral direction thereof ...

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Abstract

To properly reproduce information from a holographic memory even when a tilt error occurs in a direction vertical to a surface including optical axes of data light and reference light. During reproduction, a holographic memory ( 10 ) is fed stepwise from an initial access position with respect to a reproduction target block within a fixed back and forth range in a disk circumferential direction. In each stepwise-fed position, an SNR of a reproduction signal is calculated by an SNR calculation circuit ( 19 ) to detect the quality of the reproduction signal. A disk circumferential direction position in which an SNR becomes best is set in a circumferential direction position with respect to the reproduction target block.

Description

technical field [0001] The present invention relates to a holographic memory device for reproducing information from a holographic memory in which information is recorded by fixing interference fringes generated by interference between data light and reference light caused therein, and is particularly suitable for Used to correct tilt errors between the holographic memory and the reference light. Background technique [0002] Generally, in a holographic memory, information is recorded by fixing interference fringes generated by interference caused therein between data light and reference light on a holographic memory material. In this case, the data light undergoes spatial light modulation in accordance with the information to be recorded. Therefore, when data light and reference light are applied to the holographic memory, bright and dark interference fringes are generated on the holographic material layer according to information to be recorded. The highly polymerized mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0065G03H1/04G03H1/12G03H1/16
CPCG11B7/083G11C13/042G11B7/0065
Inventor 松村吉晋I·R·雷德蒙德
Owner SANYO ELECTRIC CO LTD
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