Sanyo Electric Co., Ltd.

Imphase Technologies

Kazuya Kogure

Kevin R Curtis

Aaron Wegner

Ken E Anderson

Yoshitaka Ikeda

Kazuya Akiyama

Masakazu Kuribara

A hologram apparatus comprises a vibration detection beam generation unit to apply a vibration detection beam, incoherent to the data and reference beams and to detect the presence/absence of vibrations, to the hologram recording medium; a light reception/determination unit to receive the vibration detection beam emitted from the medium after the beam is applied to and propagates through the medium and to determine whether the beam receiving position is within a preset range; and an interruption unit to interrupt at least one of the data and reference beams from being applied to the medium, when this unit has determined that the position of beam reception is not within the preset range.

Vibration detection apparatus, hologram apparatus, vibration detection method for the vibration detection apparatus, and recording method for the hologram apparatus

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.

Tilt detection apparatus, hologram apparatus, tilt correction method for medium, and tilt correction method for hologram medium

A hologram recording and playback method comprises establishing in advance a test region adapted to record a piece of test data for each of a reference incidence angle and a plurality of stepped incidence angles of a recording reference beam in a recording medium, successively setting an incidence angle of the recording reference beam equal to the reference incidence angle or one of the plurality of the stepped incidence angles, successively recording in the test region each piece of the test data, causing a playback reference beam to be applied to the test region at the same incidence angle as the reference incidence angle to globally play back all the pieces of the test data, selecting the data with the maximum diffraction efficiency, and correcting the incidence angles of the recording reference beam and the playback reference beam based on the difference between the reference incidence angle or one of the plurality of the stepped incidence angles corresponding to the selected data and the reference incidence angle.

Hologram apparatus and hologram recording and playback method

A switching means is provided in a power source line for supplying the A.C. power source of a main power source circuit. A lock switch is separately provided. In the normal state, the lock switch is in a locked off state, thereby controlling the on-off operation of the switching means by the automatic on-off function based on a power source operating switch and timer etc. By turning the lock switch off, the switching means is locked, thereby overriding the automatic on-off function and the power source operating switch.

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Gunma, Japan

Kazuya Kogure