Optical read/write head

Abstract

A optical reading head includes light source, collimator mirror, multi focusing lens, spherical aberration corrector, spectroscope and light detector. Light beam ejected from the light source is corrected by collimator mirror and getting through focusing lens and focused on light data memory media. Spherical aberration corrector is in between the memory media and focusing lens, including two wedge boards to adjust its thickness by their moving. The light beam reflected from the memory media is separated by spectroscope and detected by the light detector.

Description

technical field [0001] The invention relates to an optical read-write head, in particular to an optical read-write head with a spherical aberration corrector. Background technique [0002] With the advent of the information and multimedia era, consumers' demand for storage media capacity has increased dramatically. Among them, because the optical information storage medium can store a large amount of data, and has the characteristics of portability and long-term storage of data, it is quite common to use the optical information storage medium to access data. [0003] Facing the ever-increasing amount of video and audio information, increasing the data capacity of optical information storage media has always been the goal pursued by the industry. To store more data on the optical information storage medium of the same volume, there are two commonly used methods: one method is to reduce the laser spot (Laser BeamSpot-size) to shorten the track pitch (Track Pitch); the other m...

AI Technical Summary

Problems solved by technology

[0008] However, the spherical aberration corrector in the conventional technology has a fixed thickness and has a plate-like structure

When the optical read-write head reads and writes different types of optical information storage media and changes the laser wavelength and the corresponding numerical aperture of the focusing lens, the spherical aberration corrector with a fixed thickness cannot accurately correct the spherical aberration

In addition, when the optical information storage medium has multiple recording laminations, the laser light will be focused on different recording laminations respectively, resulting in different optical paths of the laser light, but the spherical aberration corrector with a fixed thickness still cannot correct the path caused by the optical path Spherical aberration caused by different lengths

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