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Title:
METHOD AND DEVICE FOR CORRECTING ASTIGMATISM OF OPTICAL HEAD
Document Type and Number:
Japanese Patent JP2605638
Kind Code:
B2
Abstract:

PURPOSE: To improve the recording and reproducing characteristics of an optical head by making the correction of the astigmatism of the optical head easily adjustable.
CONSTITUTION: This astigmatism correcting device has an adjusting section 10 for correcting the astigmatism, an optical path turning section 20 for tuning the optical path of the laser beam from this adjusting section 10 and the reflected beam from the optical disk 50 dealing with a high density, a spectral section 30 for making the laser beam from this optical path turning section 20 incident on the disk 50 and emitting this beam therefrom and an error detecting section 40. The adjusting section 10 has optical parts 1 consisting of, for example, diagonal flat plate transmissible glass, a laser beam source 2, a collimator lens 3 and a collimator holder 5 housing these members. The adjusting section 10 is arranged with the optical parts 1 between the laser beam source 2 and the collimator lens 3 and adjusts the astigmatism by rotating the optical parts 1 around the optical axis at the time of correcting the astigmatism.


Inventors:
松井 勉
Application Number:
JP1994000265289
Publication Date:
April 30, 1997
Filing Date:
October 28, 1994
Export Citation:
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Assignee:
日本電気株式会社
International Classes:
G11B7/08; G11B7/09; G11B7/135; (IPC1-7): G11B7/08; G11B7/09; G11B7/135
Domestic Patent References:
JP6243479A
JP7153109A
JP815637A
Attorney, Agent or Firm:
後藤 洋介 (外2名)