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US 7,126,901 B2Granted
Device and unit for correcting aberration of light beam
AssigneePioneer Corporation
InventorsMasayuki Iwasaki, Makoto Sato
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AssigneePioneer Corporation
InventorsMasayuki Iwasaki, Makoto Sato
Estimating the term…
An aberration correcting unit is provided for correcting an aberration of a light beam radiated onto an object to be detected and then reflected from the object. This unit comprises an aberration correcting device comprising a first corrector configured to correct the aberration of the light beam radiated onto the object; and a second corrector configured to correct the aberration of the light beam reflected from the object and to divide the reflected light beam into a plurality of light beams. The aberration correcting unit further comprises a first driver configured to drive the first corrector and a second driver configured to drive the second corrector.
An aberration correcting device used by an aberration correcting unit for correcting an aberration of a light beam radiated onto an object to be detected and then reflected from the object, the aberration correcting device comprising:
An aberration correcting unit for correcting an aberration of a light beam radiated onto an object to be detected and then reflected from the object, the aberration correcting unit comprising:
An optical pickup reading or writing bits of information from or onto an optical recording medium by radiating a light beam onto the optical recording medium and receiving the light beam reflected from the optical recording medium, comprising:
An aberration correcting method for correcting an aberration of a light beam radiated onto an object to be detected and then reflected from the object, the method comprising the steps of:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Drawings are temporarily unavailable. Open the PDF at USPTO
Separate or integrated refractive elements, e.g. wave plates: active plates, e.g. liquid crystal panels or electrostrictive elements
Optical detectors therefor: arrangement of detectors in a multiple array
Means for controlling the beam wavefront, e.g. for correction of aberration: active, e.g. controlled by electrical or mechanical means
For track following only: differential phase difference systems
Term ended 22 Apr 2025 (estimated)
1. The Field of the Invention
The present invention relates to correction of an aberration of a light beam used for reading and writing bits of information from and onto a recording medium.
2. Description of the Related Art
Other objects and aspects of the present invention will become apparent from the following description of embodiments with reference to the accompanying drawings in which:
FIGS. 1A and 1B are illustrations each a showing conventional technique for correcting an aberration of a light beam passing an optical pickup;
FIG. 2 shows the configuration of an optical pickup according to the present invention;
Preferred embodiments of the present invention will now be described hereinafter with reference to the accompanying drawings. In the following embodiments, an optical pickup will be explained, to which the present invention is applied. The optical pickup, which radiates a light beam onto an optical disk serving as an object to be detected, is equipped with an aberration correcting unit in order to correct aberration of the light beam.
(First Embodiment)
A first embodiment of the present invention will now be described.