Tilt detection apparatus, hologram apparatus, tilt correction method for medium, and tilt correction method for hologram medium
AssigneeSanyo Electric Co., Ltd.
InventorKazuya Kogure
Life of this patent
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Abstract
A tilt detection apparatus for a medium comprises a tilt detection beam generator that makes a tilt detection beam incident ion a medium to detect whether the medium is tilted with respect to a reference position; a light reception unit that receives the tilt detection beam that after striking the medium, has come from the medium; and a correction output unit that outputs a signal to correct a tilt of the medium, based on a difference in light reception position on the light reception unit between a position at which the light reception unit receives the tilt detection beam and a position at which the light reception unit is to receive the tilt detection beam when the medium is in the reference position.
Claims13
A tilt detection apparatus comprising:
- a tilt detection beam generator that makes a tilt detection beam incident in a medium to detect whether the medium is tilted with respect to a reference position;
- a light reception unit that receives the tilt detection beam that after striking the medium, has come from the medium;
- and
- a correction output unit that outputs a signal to correct a tilt of the medium, based on a difference in light reception position on the light reception unit between a position at which the light reception unit receives the tilt detection beam and a position at which the light reception unit is to receive the tilt detection beam when the medium is in the reference position.
A hologram apparatus which causes a coherent data beam corresponding to data to be recorded and a coherent recording reference beam to strike a hologram medium so as to record the data in the form of a hologram in the hologram medium, the hologram apparatus comprising:
- a tilt detection beam generator that causes a tilt detection beam, incoherent to the data beam and the recording reference beam and to detect whether the hologram medium is tilted with respect to a reference position, to strike the hologram medium;
- a light reception unit that receives the tilt detection beam that after striking the medium, has come from the hologram medium;
- a correction output unit that outputs a signal to correct a tilt of the hologram medium, based on a difference in light reception position on the light reception unit between a position at which the light reception unit receives the tilt detection beam and a position at which the light reception unit is to receive the tilt detection beam when the hologram medium is in the reference position;
- and
- a correction driver that corrects position of the hologram medium on the basis of the signal from the correction output unit.
A hologram apparatus which causes a coherent reproducing reference beam to strike a hologram medium in which data to be reproduced is recorded as a hologram and reproduces the data based on the reproducing reference beam that has been diffracted by the hologram, the hologram apparatus comprising:
- a tilt detection beam generator that causes a tilt detection beam, incoherent to the reproducing reference beam and to detect whether the hologram medium is tilted with respect to a reference position, to strike the hologram medium;
- a light reception unit that receives the tilt detection beam that after striking the medium, has come from the hologram medium;
- a correction output unit that outputs a signal to correct a tilt of the hologram medium, based on a difference in light reception position on the light reception unit between a position at which the light reception unit receives the tilt detection beam and a position at which the light reception unit is to receive the tilt detection beam when the hologram medium is in the reference position;
- and
- a correction driver that corrects position of the hologram medium on the basis of the signal from the correction output unit.
A tilt correction method for a medium comprising:
- making a tilt detection beam incident in a medium to detect whether the medium is tilted with respect to a reference position;
- receiving the tilt detection beam that after striking the medium, has come from the medium;
- and
- outputting a signal to correct a tilt of the medium, based on a difference in light reception position between a position at which the light reception unit receives the tilt detection beam and a position at which the light reception unit is to receive the tilt detection beam when the medium is in the reference position.
A tilt correction method for a hologram medium by a hologram apparatus which causes a coherent data beam corresponding to data to be recorded and a coherent recording reference beam to strike a hologram medium so as to record the data in the form of a hologram in the hologram medium, the method comprising:
- causing a tilt detection beam, incoherent to the data beam and the recording reference beam and to detect whether the hologram medium is tilted with respect to a reference position, to strike the hologram medium;
- receiving the tilt detection beam that after striking the medium, has come from the hologram medium;
- outputting a signal to correct a tilt of the hologram medium, based on a difference in light reception position between a position at which the light reception unit receives the tilt detection beam and a position at which the light reception unit is to receive the tilt detection beam when the hologram medium is in the reference position;
- and
- correcting position of the hologram medium on the basis of the signal.
A tilt correction method for a hologram medium by a hologram apparatus which causes a coherent reproducing reference beam to strike a hologram medium in which data to be reproduced is recorded as a hologram and reproduces the data based on the reproducing reference beam that has been diffracted by the hologram,,the method comprising:
- causing a tilt detection beam, incoherent to the reproducing reference beam and to detect whether the hologram medium is tilted with respect to a reference position, to strike the hologram medium;
- receiving the tilt detection beam that after striking the medium, has come from the hologram medium;
- outputting a signal to correct a tilt of the hologram medium, based on a difference in light reception position between a position at which the light reception unit receives the tilt detection beam and a position at which the light reception unit is to receive the tilt detection beam when the hologram medium is in the reference position;
- and
- correcting position of the hologram medium on the basis of the signal.
Dependencies are inferred from the claim text.