Method for correcting optical axis inclination angle error
An optical axis and error technology, applied in the field of correcting the optical axis inclination error, can solve the problems such as the inability to verticalize the optical disc, affecting the correctness of the read information, and the inability of the information to be read out correctly.
Inactive Publication Date: 2006-11-01
LITE ON IT
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0008] The inclination error of the optical axis will lead to the deterioration of the quality of the focus point, and produce the so-called crosstalk (CrossTalk) and mutual interference between signals (Inter-Symbol Interference), which will affect the correctness of the read information
[0009] Generally speaking, the inclination angle of many optical disc drives has not been properly adjusted when they leave the factory; so that the inclination angle cannot be properly compensated to the correct position when the optical disc drive is in operation
In this way, the laser beam of the optical pickup head cannot be perpendicular to the optical disc carried by the turntable; and return to the photodetector of the optical pickup head along the correct path
At this time, the information on the disc cannot be read correctly
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0019] The invention utilizes a specific voltage to control the optical pick-up head, and the specific voltage will cause the optical pick-up head to generate a compensation value of the optical axis inclination angle error, which is used to compensate the optical axis inclination angle error of the optical disc drive.
[0020] First, a series of DAC values are input, and the DAC value is a digital analog value; that is, a voltage value for controlling the optical pickup head. Each DAC value can get a PI / PO (Parity of InnerCode / Parity of Outer Code) value. Among them, the PI / PO value is an indicator that can represent the quality.
[0021] refer to figure 1 , figure 1 It is a specific function graph representing the DAC value and PI / PO value. Wherein, the DAC value on the horizontal axis is the first parameter of the specific function graph in the present invention; that is, controlling the voltage value of the optical pickup will cause the optical pickup to generate a co...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention proposes a method for correcting the error of the inclination angle of the optical axis. Its brief description is as follows: First, a series of digital-analog values (hereinafter referred to as DAC values) are input; each DAC value can obtain a parity inner code / parity outer code ratio. Utilize a specific function diagram composed of DAC value and PI / PO value, and search for the lowest point of the specific function diagram; then the DAC value corresponding to the lowest point is an optimal optical axis tilt error compensation value.
Description
technical field [0001] The invention relates to a method for correcting an optical axis inclination angle error, in particular to a method for correcting an optical axis inclination angle error in the manufacturing process of an optical disc drive. Background technique [0002] In an optical storage system, a laser diode generates a laser beam, and the generated laser beam passes through a beam splitter (Beam Splitter) and an objective lens (Object Len) and then focuses on an optical disc. The laser beam reflected by the optical disc passes through the beam splitter and guides the reflected light to the photodetector. In this way, the information stored on the optical disc is identified by the signal received by the photodetector. [0003] However, the surface of an optical disc is not perfectly flat. Therefore, an angle error will be generated when the optical pickup head reads the information of the optical disc. The angle error refers to an optical axis tilt error (Til...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/095G11B20/10
Inventor 颜丞立
Owner LITE ON IT