Reproduction apparatus and reproduction method

A technology for reproducing equipment and wavelengths, which is applied in optical recording/reproduction, information storage, holographic technology, etc. It can solve the problems of low diffraction efficiency and achieve the effects of improving diffraction efficiency, preventing image blur, and improving SN ratio

Inactive Publication Date: 2010-06-16
SONY CORP
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to realize proper recording / reproducing operation, it is necessary to compensate for the decrease in diffraction efficiency caused by the above-mentioned temperature change.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reproduction apparatus and reproduction method
  • Reproduction apparatus and reproduction method
  • Reproduction apparatus and reproduction method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0072] [1. Configuration of holographic recording / reproducing system]

[0073] [2. Derivation of conditional expression for preventing image blurring]

[0074]

[0075]

[0076]

[0077]

[0078]

[0079]

[0080]

[0081] [3. Derivation of reproduction conditions for improvement and equalization of diffraction efficiency]

[0082] [4. Temperature-compensated image with image blur prevented]

[0083] [5. Method of determining magnification and wavelength for realizing temperature compensation preventing image blurring]

[0084] [6. Simulation and Experimental Results]

[0085] [7. Specific example of temperature compensation processing in the embodiment]

[0086] [8. Conclusion]

no. 2 approach

[0088]

[0089]

[0090] [1. Configuration of holographic recording / reproducing system]

[0091] figure 1 is a block diagram showing the internal configuration of the recording / reproducing device according to the embodiment of the present invention.

[0092] figure 1 The recording / reproducing apparatus shown in is configured to perform recording and reproduction of holograms using the coaxial method. In the coaxial method, signal light and reference light are placed on the same optical axis, and irradiate a hologram recording medium set at a predetermined position, thereby recording data by forming a hologram, or irradiate the hologram recording medium with reference light at the time of reproduction , thereby reproducing the data recorded as a hologram.

[0093] also, figure 1 The recording / reproducing apparatus shown in is configured to perform recording / reproducing corresponding to the transmission hologram recording medium HM having no reflective film.

[0094]...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
wavelengthaaaaaaaaaa
thicknessaaaaaaaaaa
refractive indexaaaaaaaaaa
Login to View More

Abstract

A reproduction apparatus includes: a wavelength-tunable light source that outputs light illuminating a hologram recording medium such that a wavelength is variable; an optical system that illuminates through an objective lens the hologram recording medium with the reference light generated on the basis of light emitted from the wavelength-tunable light source and that includes a power changing section which changes a zoom power of the reference light incident on the objective lens; a temperature detecting section that detects a temperature of the hologram recording medium; and a control section that, when setting the zoom power of the reference light and the wavelength of the wavelength-tunable light source in response to a result of the temperature detected by the temperature detecting section, performs control such that the zoom power of the reference light and the wavelength of the wavelength-tunable light source satisfy a condition [ [Delta]m = [Delta] [lambda] / [lambda] W ] .

Description

technical field [0001] The present invention relates to a reproduction apparatus and a reproduction method for performing reproduction on a hologram recording medium in which information is recorded by forming a hologram using interference fringes between signal light and reference light. Background technique [0002] For example, a hologram recording / reproducing method that performs data recording by forming a hologram from interference fringes between signal light and reference beams is known, disclosed in Japanese Unexamined Patent Application Publication No. 2007-200385. In this holographic recording / reproducing method, at the time of recording, signal light subjected to spatial light modulation (for example, light intensity modulation) corresponding to recording data and reference light different from the signal light The hologram recording medium is irradiated, and interference fringes (holograms) between signal light and reference light are formed in the recording med...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(China)
IPC IPC(8): G11B7/00G05B11/06
CPCG03H2222/54G03H2222/13G03H2222/46G11B7/1378G03H1/16G03H1/2286G11B2007/13727G11B7/083G03H2222/35G11B7/127
Inventor伊藤辉将
OwnerSONY CORP