Optical information recording/reproducing device and holographic recording/reproducing method
AssigneeHitachi-LG Data Storage, Inc.
InventorKazuyoshi YAMAZAKI
Life of this patent
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Abstract
An optical information recording/reproducing device which reproduces information from an optical information storage medium in which an interference pattern between a signal beam and a reference beam is recorded as page data includes a controller, a laser light source, a split part, an angle variable part, an optical part, a first light detector, and a second light detector, and the controller controls the angle variable part based on a control signal generated from a first signal detected by the first light detector and a second signal detected by the second light detector.
Claims13
An optical information recording/reproducing device which reproduces information from an optical information storage medium in which an interference pattern between a signal beam and a reference beam is recorded as page data, the optical information recording/reproducing device comprising:
- a controller configured to control the entire optical information recording/reproducing device;
- a laser light source;
- a split part configured to split a light beam emitted from the laser light source into a signal beam and a reference beam;
- an angle variable part configured to change an angle of incidence of the reference beam to which the optical information storage medium is to be exposed;
- an optical part configured to cause the reference beam having transmitted the optical information storage medium through the angle variable part to enter the optical information storage medium again;
- a first light detector configured to detect a first recovered beam generated when the reference beam enters the optical information storage medium through the angle variable part;
- and
- a second light detector configured to detect a second recovered beam generated when the reference beam having transmitted the optical information storage medium enters the optical information storage medium again, wherein
- the controller controls the angle variable part based on a control signal generated from a first signal detected by the first light detector and a second signal detected by the second light detector.
An optical information recording/reproducing method for reproducing information from an optical information storage medium in which an interference pattern between a signal beam and a reference beam is recorded as page data, the optical information recording/reproducing method comprising:
- a step of splitting a light beam emitted from a laser light source into a signal beam and a reference beam;
- an angle variable step of changing an angle of incidence of the reference beam to which the optical information storage medium is to be exposed;
- a step of causing the reference beam having transmitted the optical information storage medium through the angle variable step to enter the optical information storage medium again;
- a first light detection step of detecting a first recovered beam generated when the reference beam enters the optical information storage medium through the angle variable step;
- a second light detection step of detecting a second recovered beam generated when the reference beam having transmitted the optical information storage medium enters the optical information storage medium again;
- and
- a step of controlling an angle of incidence of the reference beam based on a control signal generated from a first signal detected in the first light detection step and a second signal detected in the second light detection step, wherein
- a relative angle between a first angle of incidence and a second angle of incidence is substantially φ, where an angle of incidence at which the reference beam enters the optical information storage medium through the angle variable step is the first angle of incidence, and an angle of incidence at which the reference beam having transmitted the optical information storage medium enters the optical information storage medium again is the second angle of incidence.
An optical information recording/reproducing device which reproduces information from an optical information storage medium in which an interference pattern between a signal beam and a reference beam is recorded as page data, the optical information recording/reproducing device comprising:
- a controller configured to control the entire optical information recording/reproducing device;
- a laser light source;
- a split part configured to split a light beam emitted from the laser light source into a signal beam and a reference beam;
- a first angle variable part configured to change an angle of incidence, in an angle-multiplexing direction, of the reference beam to which the optical information storage medium is to be exposed;
- a second angle variable part configured to change an angle of incidence in a direction substantially perpendicular to the first angle variable part;
- and
- an imaging part configured to detect a diffracted beam generated from a hologram in the optical information storage medium when the optical information storage medium is exposed to the reference beam, wherein
- the controller controls the first angle variable part after controlling the second angle variable part, and
- the imaging part detects a recovered signal.
Dependencies are inferred from the claim text.