Beam shaping device, an optical head, and a master disk recording apparatus
OwnerShinya Abe, Eiichi Itoinventors
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Abstract
A beam shaping device shapes a light beam from a light source to have a circular cross section, and changes the refractive index thereof by causing an electric field to be produced by a voltage applied to electrodes thereof. In this way, the light beam from the light source is deflected, and an objective lens gather the shaped and deflected light beam to expose an optical disk.
Claims19
A beam shaping device for shaping a light beam, characterized in that the refractive index of the beam shaping device changes in accordance with an applied voltage.
An optical head, comprising:
- a light source for emitting a light beam,
- a beam shaping device for shaping the light beam from the light source,
- an objective lens for gathering the light beam from the beam shaping device, and
- a driving means for driving the objective lens,
- wherein the refractive index of the beam shaping device changes in accordance with an applied voltage.
An optical head, comprising:
- a semiconductor laser for emitting a light beam,
- an objective lens for gathering the light beam,
- a driving means for driving the objective lens, and
- a deflecting element provided between the semiconductor laser and the objective lens for deflecting the light beam from the semiconductor laser.
A master disk recording apparatus, comprising:
- a rotating means for rotating while holding a master disk having a photosensitive layer,
- an optical head for gathering a light beam and irradiating the master disk with the gathered light beam, and
- a moving means for moving one of the optical head and the rotating means in a radial direction of the master disk,
- wherein the optical head includes a light source for emitting the light beam, a beam shaping device for shaping the light beam from the light source, an objective lens for gathering the light beam from the beam shaping device, and a driving means for driving the objective lens, wherein the refractive index of the beam shaping device changes in accordance with an applied voltage.
A master disk recording apparatus, comprising:
- a rotating means for rotating while holding a master disk having a photosensitive layer,
- an optical head for gathering a light beam and irradiating the master disk with the gathered light beam, and
- a moving means for moving one of the optical head and the rotating means in a radial direction of the master disk,
- wherein the optical head includes a semiconductor laser for emitting the light beam, an objective lens for gathering the light beam, a driving means for driving the objective lens, and a deflecting element provided between the semiconductor laser and the objective lens for deflecting the light beam from the semiconductor laser.
Dependencies are inferred from the claim text.