HOLOGRAM REPRODUCING DEVICE AND HOLOGRAM REPRODUCING METHOD

摘要

A hologram reproducing device which reproduces information from a recording medium having information recorded by interfering a signal beam and a reference beam, provided with a first light-angle change unit which changes an irradiation angle of the reference beam; a second light-angle change unit which changes the irradiation angle of the reference beam; a photodetector which detects a reproduction beam; a first light-angle drive-signal output unit which outputs a drive signal of the first light-angle change unit; a first light-angle control unit which controls the first light-angle change unit on the basis of the output of the photodetector; a second light-angle drive-signal output unit which outputs a drive signal of the second light-angle change unit; a second light-angle control unit which controls the second light-angle change unit; and a light-angle interpolation processing unit which controls a control target value of the second light-angle control unit.

主权项

1. A hologram reproducing device which reproduces information from a recording medium having information recorded by interfering a signal beam and a reference beam, comprising:
a first light-angle change unit which changes an irradiation angle of the reference beam to the recording medium in a plane including an optical axis of the signal beam and a normal line of the recording medium; a second light-angle change unit which changes the irradiation angle of the reference beam in a plane in a substantially vertical direction to the plane including the optical axis of the signal beam and the normal line of the recording medium; a photodetector which detects a reproduction beam which is from the recording information medium; a first light-angle drive-signal output unit which outputs a drive signal of the first light-angle change unit; a first light-angle control unit which controls the first light-angle change unit via the first light-angle drive-signal output unit on the basis of output of the photodetector; a second light-angle drive-signal output unit which outputs a drive signal of the second light-angle change unit; a second light-angle control unit which controls the second light-angle change unit via the second light-angle drive-signal output unit; and a light-angle interpolation processing unit which controls a control target value of the second light-angle control unit by performing interpolation processing of a control target value of the first light-angle control unit and outputting the interpolation processed control target value to the second light-angle control unit.