US 2017/0162221 A1 · Optical Information Recording/Reproduction Device and Optical Information Recording/Reproduction Method

Abstract

Provided is a recording method with which wasteful consumption of the M number (M/#) of the recording material is prevented, and with which the recording density is improved. An optical information recording device that utilizes interference between signal light and reference light to record information on an optical information recording medium is equipped with: a light source that emits light toward an optical recording medium; a beam-splitting element that splits the emission light emitted from the light source into signal light and reference light; and a reference light angle control unit that controls the incidence angle of the reference light with respect to the optical information recording medium. The optical recording medium is irradiated with the signal light as a spherical wave and is irradiated with the reference light as a planar wave, and when information is recorded on the optical information recording medium, the optical information recording medium is irradiated such that there exists in the interior of the optical information recording medium a region which is exposed only to the signal light, a region which is exposed only to the reference light, and a region which is exposed to overlapping signal light and reference light.

Claims20

Dependent claims

An optical information recording device that records information on an optical information recording medium using interference between signal light and reference light, the optical information recording device comprising:

a light source that emits light toward the optical information recording medium;
a beam-splitting element that splits the emission light emitted from the light source into the signal light and the reference light;
a reference light angle control unit that controls an angle of incidence of the reference light with respect to the optical information recording medium;
a signal light optical system that irradiates the optical information recording medium with the signal light as a spherical wave;
and
a reference light optical system that irradiates the optical information recording medium with the reference light as a planar wave,
wherein information is recorded by irradiating the optical information recording medium with the signal light and the reference light such that when the optical information recording medium is seen from a first direction which is a direction in which the angle of incidence of the reference light changes with respect to the optical information recording medium, there exist in the interior of the optical information recording medium a region which is exposed to the signal light, a region which is exposed to the reference light, and a region which is exposed to overlapping signal light and reference light.

4 more elements

An information recording method for recording information on an optical information recording medium using interference between signal light and reference light, the method comprising:

a step of emitting light toward the optical information recording medium;
a step of splitting the emission light emitted from the light source into the signal light and the reference light;
a step of controlling an angle of incidence of the reference light with respect to the optical information recording medium;
a step of irradiating the optical information recording medium with the signal light as a spherical wave;
a step of irradiating the optical information recording medium with the reference light as a planar wave;
and
a step of recording information by irradiating the optical information recording medium with the signal light and the reference light such that when the optical information recording medium is seen from a first direction which is a direction in which the angle of incidence of the reference light changes with respect to the optical information recording medium, there exist in the interior of the optical information recording medium a region which is exposed to the signal light, a region which is exposed to the reference light, and a region which is exposed to overlapping signal light and reference light.

4 more elements

Dependencies are inferred from the claim text.

Optical Information Recording/Reproduction Device and Optical Information Recording/Reproduction Method

Life of this patent

Optical Information Recording/Reproduction Device and Optical Information Recording/Reproduction Method

Life of this patent

Abstract

Claims20