CN101393752B - Automatic measurement method for linearity of focus error signal of optical head - Google Patents
Automatic measurement method for linearity of focus error signal of optical head Download PDFInfo
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- CN101393752B CN101393752B CN2008102286559A CN200810228655A CN101393752B CN 101393752 B CN101393752 B CN 101393752B CN 2008102286559 A CN2008102286559 A CN 2008102286559A CN 200810228655 A CN200810228655 A CN 200810228655A CN 101393752 B CN101393752 B CN 101393752B
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Abstract
The invention discloses a method for automatically measuring the optical head focusing error signal linearity, which comprises the following steps by using a computer: enabling an optical head to be in a focusing state; adjusting the focusing error signal, generating parameters and confirming at least 2n+1 equally spaced focus points in the S-shaped linear zone of the focusing error signals, n being an positive integer not equal to zero, the 2n+1equally spaced focus points being uniformly distributed from up to down, when n=1, the focus points at two ends being not the highest or lowest points; carrying out the automatic focusing gain adjustment on each focus point, and calculating the slope value of each focus point according to a focusing gain automatic adjustment value and a corresponding relation of the gain adjustment value and the slope value in the S-shaped linear zone of the focusing error signals; and calculating the ratio between the maximum slope value and the minimum slope value of each focus point, thereby requiring the linearity index, the automatic measurement of which can be finished in 1 to 2 seconds. The method has the advantages of simple operation, accurate result, low labor intensity, high detection efficiency and the like.
Description
Technical field:
The present invention relates to the measuring method of a kind of CD writer or player optical head performance, especially a kind of method for automatic measurement of simple to operate, the result is accurate, labour intensity is low, detection efficiency is high linearity of focus error signal of optical head.
Background technology:
Optical head focus error signal (FE) is through the focus error signal generation unit by servosignal; Again through generating parameter (1-balance, 1+balance) adjustment and form, generate focus point that parameter can make optical head and move along the S font of focus error signal (FE) through changing adjustment.The linearity of S word is the linearity of optical head focus error signal both; Be important performance index, will influence the stability of optical head focus servo, represent with the KINK value usually like poor linearity; With " 1 " is benchmark, and the KINK value is greatly then explained the poor linearity of focus error signal (FE).At present, all use visual method, promptly judge through the figure of the optical head focus error signal (FE) that records on the observation oscilloscope for the measurement of optical head KINK value.The method complicated operation, labour intensity are high, efficient is low, therefore in actual production, can not carry out exhaustive test to optical head.Even if so also exist problems such as testing result is influenced greatly by human factor, degree of accuracy is low, directly influenced reliability of products.
Summary of the invention:
Technical matterss such as the present invention is that existing in prior technology complicated operation, labour intensity are high in order to solve, efficient and degree of accuracy are low provide a kind of method for automatic measurement of simple to operate, the result is accurate, labour intensity is low, detection efficiency is high linearity of focus error signal of optical head.
Technical solution of the present invention is: a kind of method for automatic measurement of linearity of focus error signal of optical head is characterized in that it being to carry out following steps successively with computing machine:
A. make optical head be in focus state;
B. adjust focus error signal and generate parameter; Confirm the focus point of 2n+1 equidistance at least at focus error signal S word linear zone, n is not equal to zero positive integer, and the focus point of 2n+1 equidistance evenly distributes up and down; When n=1, the focus point at two ends is not the highest or minimum point;
C. on each focus point, carry out focusing gain respectively and adjust automatically,, calculate the slope value of each focus point focus according to the corresponding relation of the automatic adjusted value of focusing gain and gain adjustment value and focus error signal S word linear zone slope;
E. calculate the maximal value of focus point slope and the ratio between the minimum value, promptly obtain linearity index.
The present invention operates with computing machine; Focus point at definite at least 3 equidistance of focus error signal S word linear zone carries out focusing gain respectively and adjusts automatically, through calculating the slope value of each focus point on each focus point; And the maximal value of focus point slope compared with minimum value; Its ratio is linearity of focus error signal of optical head, can in 1～2 second, accomplish the automatic measurement of the linearity, have simple to operate, the result is accurate, labour intensity is low and the detection efficiency advantages of higher.
Description of drawings:
Fig. 1 is the process flow diagram of the embodiment of the invention.
Fig. 2 is the synoptic diagram that the embodiment of the invention is confirmed focus point.
Embodiment:
Below with accompanying drawings embodiment of the present invention.As shown in Figure 1: the concrete operations step is following:
A. through focus servo control, make optical head be in focus state;
B. adjust focus error signal and generate parameter b alance; The focus point of optical head is moved at focus error signal S word linear zone; The definite focus point of 2n+1 equidistance (n=1,2,3 at least as shown in Figure 2 ...); The focus point of 2n+1 equidistance should evenly distribute up and down, and when n=1, the focus point at two ends should not be the highest or minimum point;
C. on each focus point, carry out focusing gain respectively according to prior art and adjust automatically, even the cutoff frequency ω c of the amplitude-versus-frequency curve of focus servosystem after digital PID is proofreaied and correct satisfies design load; Should list the corresponding relation of automatic gain adjusted value and focus error signal S word linear zone slope through experiment before measuring, and corresponding relation is stored in the computing machine; According to the corresponding relation of each focus point automatic gain adjusted value and focus error signal S word linear zone slope, can calculate the slope value of each focus point and resulting slope value is stored during measurement;
D. find out the maximal value and the minimum value of focus point slope, calculate the maximal value of focus point slope and the ratio between the minimum value, promptly obtain linearity index.
Claims (1)
1. the method for automatic measurement of a linearity of focus error signal of optical head is characterized in that it being to carry out following steps successively with computing machine:
A. make optical head be in focus state;
B. adjust focus error signal and generate parameter; Confirm the focus point of 2n+1 equidistance at least at focus error signal S word linear zone, n is not equal to zero positive integer, and the focus point of 2n+1 equidistance evenly distributes up and down; When n=1, the focus point at two ends is not the highest or minimum point;
C. on each focus point, carry out focusing gain respectively and adjust automatically,, calculate the slope value of each focus point according to the corresponding relation of the automatic adjusted value of focusing gain and gain adjustment value and focus error signal S word linear zone slope;
D. calculate the maximal value of focus point slope and the ratio between the minimum value, promptly obtain linearity index.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102286559A CN101393752B (en) | 2008-11-10 | 2008-11-10 | Automatic measurement method for linearity of focus error signal of optical head |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102286559A CN101393752B (en) | 2008-11-10 | 2008-11-10 | Automatic measurement method for linearity of focus error signal of optical head |
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| Publication Number | Publication Date |
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| CN101393752A CN101393752A (en) | 2009-03-25 |
| CN101393752B true CN101393752B (en) | 2012-05-30 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102054492A (en) * | 2010-11-12 | 2011-05-11 | 中国华录·松下电子信息有限公司 | Automatic measurement method for focusing error signal linearity of optical head |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151069A (en) * | 1995-09-30 | 1997-06-04 | 三星电子株式会社 | Multi-layered disk focusing method and apparatus |
| US6028825A (en) * | 1996-09-19 | 2000-02-22 | Lg Electronics Inc. | Apparatus for automatically controlling focus and method thereof in a disc player |
| JP2004071054A (en) * | 2002-08-06 | 2004-03-04 | Sanyo Electric Co Ltd | Disk reproducing device |
| CN1495727A (en) * | 1996-10-04 | 2004-05-12 | �¹���ķѷ-�����ع�˾ | Optical information carrier with servo control circuit recording or replaying method |
| CN1647168A (en) * | 2002-04-17 | 2005-07-27 | 皇家飞利浦电子股份有限公司 | Optical pickup |
| CN1716396A (en) * | 2004-07-02 | 2006-01-04 | 建兴电子科技股份有限公司 | Focusing control method for optical disc |
| CN101197150A (en) * | 2006-12-07 | 2008-06-11 | 株式会社日立制作所 | Optical disk apparatus and focusing method |
-
2008
- 2008-11-10 CN CN2008102286559A patent/CN101393752B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151069A (en) * | 1995-09-30 | 1997-06-04 | 三星电子株式会社 | Multi-layered disk focusing method and apparatus |
| US6028825A (en) * | 1996-09-19 | 2000-02-22 | Lg Electronics Inc. | Apparatus for automatically controlling focus and method thereof in a disc player |
| CN1495727A (en) * | 1996-10-04 | 2004-05-12 | �¹���ķѷ-�����ع�˾ | Optical information carrier with servo control circuit recording or replaying method |
| CN1647168A (en) * | 2002-04-17 | 2005-07-27 | 皇家飞利浦电子股份有限公司 | Optical pickup |
| JP2004071054A (en) * | 2002-08-06 | 2004-03-04 | Sanyo Electric Co Ltd | Disk reproducing device |
| CN1716396A (en) * | 2004-07-02 | 2006-01-04 | 建兴电子科技股份有限公司 | Focusing control method for optical disc |
| CN101197150A (en) * | 2006-12-07 | 2008-06-11 | 株式会社日立制作所 | Optical disk apparatus and focusing method |
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Effective date of registration: 20160721 Address after: 116000, Dalian building, 717 Huangpu Road, 10 hi tech Industrial Park, Liaoning, China Patentee after: Hua Luguang Storage Research Institute (Dalian) Limited Address before: 116000 Liaoning city of Dalian province high tech Park Road No. 1 (Chinese Hualu Matsushita Electronic Information Co., Ltd.) Patentee before: China Hualu-Panisonic Electronic Information Co., Ltd. |