Method for regulating photoelectric probe position of high dense CD reading head

A technology of photoelectric detectors and adjustment methods, which is applied to optical detectors, optical recording/reproduction, optical head manufacturing, etc., can solve the problems of troublesome adjustment process and complicated servo circuits, and achieve easy adjustment and positioning accuracy high effect

Inactive Publication Date: 2007-04-18
JIANGSU YINHE ELECTRONICS +1
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Problems solved by technology

Therefore, the traditional method of adjusting the position of the photodetector of the optical dis

Method used

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  • Method for regulating photoelectric probe position of high dense CD reading head
  • Method for regulating photoelectric probe position of high dense CD reading head
  • Method for regulating photoelectric probe position of high dense CD reading head

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Example Embodiment

[0022] As shown in Figure 1, the optical path structure of a high-disk optical disc reading head includes: a semiconductor laser 1, a grating 2, a collimator lens 3, a half mirror 4, a cylindrical mirror 5, a photodetector 6, a reflection The lens 7, the objective lens 8, the optical disc 9 and the main shaft 10, the main shaft 10 is driven by a spindle motor; for the optical path structure of the optical disc reading head, the method for adjusting the position of the photodetector of the high-density optical disc reading head of the present invention has the following steps: :

[0023] 1. In the optical path structure of the optical disc reading head, a flat mirror is used instead of the optical disc 9 to ensure that the reflecting surface of the flat mirror is aligned with the optical axis of the objective lens 8;

[0024] 2. Remove the cylindrical lens 5 of the optical disc reading head, adjust the distance between the plane lens and the objective lens 8 to the focal length of ...

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Abstract

The invention discloses a location adjusting method for high density disc read head photo detector. It includes the following steps: adopting a flat mirror to make the reflected light plumbed to light shaft of object lens, removing cylindrical mirror in head light path structure and adjusting the distance between flat mirror and object lens to object lens focus, installing cylindrical mirror, adjusting the location of photo detector to make the sum of output voltage on the quadrant to maximum, adjusting the photo detector plumbing to the location of incident light plane and making the output voltage in four quadrant equal. The invention has high accuracy of photo detector.

Description

technical field [0001] The invention relates to a method for adjusting the position of a photodetector of an optical disc reading head, in particular to a method for adjusting the position of a photodetector of a laser reading head of a high-density optical disc. Background technique [0002] During the assembly process of the optical disc pickup head, the adjustment and positioning of the photodetector is one of the key steps. The photodetector is responsible for converting the light reflected from the information layer of the disc into an electrical signal. In order to obtain the servo error signal, the photosensitive surface of the photodetector is divided into multiple quadrants. By calculating the output voltage signal of each quadrant, we can get Servo error signal. Therefore, the accuracy of the photoelectric detection position will directly affect the accuracy of servo error signal acquisition and the quality of the final signal. The optical path structure of the c...

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Application Information

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IPC IPC(8): G11B7/22G11B7/13G11B7/131
Inventor 马建设唐毅张步卿李莉华程雪岷毛乐山齐国生潘龙法张磊季建东吴建明
Owner JIANGSU YINHE ELECTRONICS
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