Optical information recording and reproducing device, optical information recording and reproducing method

Patent metadata

Field	Value
Publication number	US-9761263-B2
Application number	US-201214651016-A
Country	US
Kind code	B2
Filing date	Dec 12, 2012
Priority date	Dec 12, 2012
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

An optical information recording and reproducing device that records information on a recording medium and/or reproduces information on the recording medium, using holography is configured to include a laser light source that performs irradiation with laser light, a first light-shielding portion which is capable of switching between transmission and shielding of laser light emitted from the laser light source, and a driving circuit that drives the switching between transmission and shielding of the first light-shielding portion, and a first movement portion that moves the first light-shielding portion.

First claim

The invention claimed is:

1. An optical information recording and reproducing device that records information on a recording medium and/or reproduces information from the recording medium, using holography, the device comprising:
a laser light source that performs irradiation with laser light;
a first light-shielding portion which is capable of switching between transmission and shielding of laser light emitted from the laser light source;
a driving circuit that drives the switching transmission or shielding of the first light-shielding portion; and
a first movement portion that moves the first light-shielding portion.

2. The optical information recording and reproducing device according to claim 1 , further comprising:
a second light-shielding portion that shields the laser light emitted from the laser light source; and
a second movement portion that moves the second light-shielding portion.

3. The optical information recording and reproducing device according to claim 2 , wherein a liquid crystal element is used as the first light-shielding portion, and a mechanical shutter is used as the second light-shielding portion.

4. The optical information recording and reproducing device according to claim 2 , further comprising a splitter that splits the laser light into signal light and reference light,
wherein the first light-shielding portion and the second light-shielding portion are disposed between the laser light source and the splitter.

5. The optical information recording and reproducing device according to claim 4 , wherein the second light-shielding portion is disposed closer to the laser light source side than the first light-shielding portion.

6. The optical information recording and reproducing device according to claim 1 , wherein the movement portion is a rotating movement portion, and the laser light is shielded or transmitted by the movement portion being rotated.

7. The optical information recording and reproducing device according to claim 2 , wherein the first light-shielding portion and the second light-shielding portion are integrally placed at the same base, and
a switching mechanism which is capable of irradiating at least any one of the first light-shielding portion or the second light-shielding portion with a laser from the laser light source is provided.

8. The optical information recording and reproducing device according to claim 2 , wherein when information is recorded on the recording medium, the second light-shielding portion is retreated from an optical path of the laser, the first light-shielding portion is inserted into the optical path of the laser, and the driving circuit performs the switching between transmission and shielding of the first light-shielding portion.

9. The optical information recording and reproducing device according to claim 2 , wherein when information is reproduced from the recording medium, the first light-shielding portion and the second light-shielding portion are retreated from an optical path of the laser.

10. The optical information recording and reproducing device according to claim 2 , wherein when the optical information recording and reproducing device is powered-on, the optical information recording and reproducing device stands by, or the recording medium is loaded into the optical information recording and reproducing device, the second light-shielding portion is inserted into an optical path of the laser, and the first light-shielding portion is retreated from the optical path of the laser.

11. The optical information recording and reproducing device according to claim 2 , wherein when a curing process is performed on the recording medium, the second light-shielding portion is inserted into an optical path of the laser, and the first light-shielding portion is inserted into the optical path of the laser.

12. The optical information recording and reproducing device according to claim 2 , wherein when a plurality of pieces of page data are recorded on the same region of the recording medium while changing an incidence angle of the reference light on the recording medium, the second light-shielding portion is retreated from an optical path of the laser, and the first light-shielding portion is inserted into the optical path of the laser, and
in a state where the first light-shielding portion transmits the laser, first page data is recorded on the recording medium at a first reference light angle, and
when a change from the first reference light angle to a second reference light angle is performed, the first light-shielding portion shields the laser.

13. The optical information recording and reproducing device according to claim 1 , wherein when a plurality of pieces of page data are recorded on the same region of the recording medium while changing an incidence angle of the reference light on the recording medium, the first light-shielding portion is inserted into an optical path of the laser, and
in a state where the first light-shielding portion transmits the laser, first page data is recorded on the recording medium at a first reference light angle, and
when a change from the first reference light angle to a second reference light angle is performed, the first light-shielding portion shields the laser.

14. The optical information recording and reproducing device according to claim 2 , wherein when the optical information recording and reproducing device is powered-on, the first light-shielding portion and the second light-shielding portion are inserted into an optical path of the laser, and the first light-shielding portion is in a first state where the laser is shielded, and
after the laser light source is determined to be stabilized, the first state is switched to a second state where the first light-shielding portion and the second light-shielding portion are retreated from the optical path of the laser.

15. The optical information recording and reproducing device according to claim 2 , where the first movement portion and the second movement portion are common to each other.

16. An optical information recording method of recording on information on a recording medium, using holography, the method comprising:
a step of performing irradiation with laser light;
a step of splitting the laser light into reference light and signal light;
a step of switching between transmission and shielding of the laser light by a light-shielding portion;
a step of driving the switching between transmission or shielding of the light-shielding portion; and
a step of moving the light-shielding portion,
wherein when a plurality of pieces of page data are recorded on the same region of the recording medium while changing an incidence angle of the reference light on the recording medium,
the light-shielding portion is inserted into an optical path of the laser, and
in a state where the light-shielding portion transmits the laser, first page data is recorded on the recording medium at a first reference light angle, and
when a change from the first reference light angle to a second reference light angle is performed, the light-shielding portion shields the laser.

Assignees

• Hitachi Consumer Electronics

Inventors

• Taguchi Hirofumi
• Fujita Koji
• Nakai Nobuo
• Nishimura Koichiro
• Hoshizawa Taku
• Yamazaki Kazuyoshi

Classifications

• G11B7/1395

  Beam splitters or combiners (G11B7/1353, G11B7/1356 take precedence {; beam splitting or combining per se G02B27/10}) · CPC title

• G11B7/1381

  Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops (G11B7/1353 - G11B7/1369 take precedence) · CPC title

• G11B7/127

  Lasers; Multiple laser arrays {(lasers per se H01S)} · CPC title

• G11B7/0065 Primary

  Recording, reproducing or erasing by using optical interference patterns, e.g. holograms · CPC title