CN1687989A - Measuring method of dynamic parameter of optical head moment apparatus - Google Patents
Measuring method of dynamic parameter of optical head moment apparatus Download PDFInfo
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- CN1687989A CN1687989A CN 200510066029 CN200510066029A CN1687989A CN 1687989 A CN1687989 A CN 1687989A CN 200510066029 CN200510066029 CN 200510066029 CN 200510066029 A CN200510066029 A CN 200510066029A CN 1687989 A CN1687989 A CN 1687989A
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- frequency
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- torquer
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Abstract
The invention is a method for testing dynamic parameters of moment instrument of an optical head, firstly outputting amplitude A-fixed sine signals at different frequencies from the low to the high; driving the moment instrument to dither by sine signal; casting a laser beam on the reflecting point of an objective of the moment instrument to measure the dithering speed at the reflecting point; integrating the speed signal to obtain displacement response signals of the reflecting point by the excitation of the sine signals at the above frequencies; respectively, drawing am amplitude frequency characteristic curve and a phase frequency characteristic curve for the moment instrument to obtain the dynamic parameters of the moment instrument from the two curves. The method can make complete and high-efficiency testing of dynamic performance of a moment instrument, applied to evaluating the operating performance of the moment instrument, and having strong practicality.
Description
Technical field
The present invention relates to a kind of method of testing of dynamic parameter of optical head moment apparatus, relate in particular to the method for testing of dynamic parameter of optical head moment apparatus in the CD drive, belong to the light storage device technical field of performance test.
Background technology
In optical disk system, torquer is the actual execution unit of optical head servo action.Its role is to, read the error signal of obtaining in the process according to optical head at CD, promptly focus on and tracking error signal, drive the object lens motion in real time, the hot spot that the fluctuating vibration that makes focal beam spot can overcome CD brings is in the skew of disc focus direction and tracking direction, thereby accurately drop on the information track of CD, realize high-quality reading and writing data.
The dynamic property of torquer will directly determine the control accuracy that focus servo and tracking servo system can reach, and being influences the key factor that optical head reads accuracy and stability.The performance test of torquer and quality control are extremely important to the production and the quality guarantee of optical head.The torquer complex structure, parameter is numerous, for the serviceability of rational and effective evaluation torquer, must the accurate dynamic parameter of measuring various parameters, the especially torquer of torquer.
(publishing house of Tsing-Hua University publishes " high density compact disc data storage ", 132～141 pages, Xu Duanyi work) a kind of method of testing of torquer dynamic parameter is disclosed, this method is an indirect test method, the half direct method of testing that perhaps needs additional mass, its shortcoming is that test speed is slow, measuring accuracy is low, can not accurately measure the dynamic perfromance of high band, additional quality can influence the dynamic perfromance of torquer itself again, along with the raising that the torquer frequency of operation requires, these methods can't satisfy the needs of actual test.
Summary of the invention
The objective of the invention is to propose a kind of method of testing of dynamic parameter of optical head moment apparatus, existing indirectly testing is changed over direct test, need on torquer, not increase any annex, and propose the data handling procedure of this method of testing.
The method of testing of the dynamic parameter of optical head moment apparatus that the present invention proposes comprises following each step:
(1) exports the sinusoidal signal of fixed amplitude A under the different frequency f from low to high respectively;
(2) torquer produces shake under the driving of above-mentioned sinusoidal signal;
(3) beam of laser is shone on the reflection spot of torquer object lens, record the buffeting speed at this reflection spot place on the object lens;
(4) above-mentioned rate signal is carried out integration, obtain this displacement response signal Y (f)=B (f) ∠ φ (f) under the sinusoidal signal excitation of said frequencies f, wherein B (f) be torquer in frequency is the amplitude that the sinusoidal signal of f drives the bottom offset response signal, and φ (f) is a torquer in frequency is displacement response signal under the sinusoidal signal of f drives and the phase differential between the drive signal;
(5) draw the amplitude frequency and the phase-frequency curve of torquer respectively, wherein the horizontal ordinate of amplitude frequency characteristic is the corresponding frequencies f of sinusoidal signal, and ordinate is and the corresponding amplitude response of this frequency f
Wherein the horizontal ordinate of phase-frequency curve is the corresponding frequencies f of sinusoidal signal, and ordinate is and the corresponding phase response φ of this frequency f (f);
(6) on above-mentioned amplitude frequency characteristic, obtain following torquer dynamic parameter:
Sensitivity: be 10
(G/20), wherein G is the ordinate of amplitude frequency characteristic;
First order resonance frequency f
0: the horizontal ordinate frequency corresponding with first resonance peak of low-frequency range of amplitude frequency characteristic;
First order resonant peak value Q
0: with f
0Corresponding ordinate and the ordinate corresponding poor with 5Hz;
Second order resonant frequency f
1: the horizontal ordinate frequency corresponding with second resonance peak place of amplitude frequency characteristic high band;
Second order resonance peak Q
1: with f
1The corresponding ordinate and the ordinate of 5Hz correspondence poor;
On above-mentioned phase-frequency curve, ordinate is the phase place at corresponding frequencies place.
The method of testing of the dynamic parameter of optical head moment apparatus that the present invention proposes, with respect to previously used indirect test method, this method need not used any annex, do not influence the characteristic of torquer itself, test speed is fast, measuring accuracy is high, can test the dynamic perfromance of each frequency range of low frequency tremendously high frequency, and the dynamic property curve of test moment device accurately comprehensively obtains every dynamic performance parameter of torquer, be used to estimate the serviceability of torquer, practical.Method of the present invention is applicable to the focusing coil and the tracking coil of torquer, and the two test is identical with disposal route.
Embodiment
The method of testing of the dynamic parameter of optical head moment apparatus that the present invention proposes is at first exported the sinusoidal signal of fixed amplitude A respectively under the different frequency f from low to high; Torquer produces shake under the driving of above-mentioned sinusoidal signal; Beam of laser is shone on the reflection spot of torquer object lens, record the buffeting speed at this reflection spot place on the object lens; Above-mentioned rate signal is carried out integration, obtain this displacement response signal Y (f)=B (f) ∠ φ (f) under the sinusoidal signal excitation of said frequencies f, wherein B (f) be torquer in frequency is the amplitude that the sinusoidal signal of f drives the bottom offset response signal, and φ (f) is a torquer in frequency is displacement response signal under the sinusoidal signal of f drives and the phase differential between the drive signal; Draw the amplitude frequency and the phase-frequency curve of torquer respectively, wherein the horizontal ordinate of amplitude frequency characteristic is the corresponding frequencies f of sinusoidal signal, and ordinate is and the corresponding amplitude response of this frequency f
Wherein the horizontal ordinate of phase-frequency curve is the corresponding frequencies f of sinusoidal signal, and ordinate is and the corresponding phase response φ of this frequency f (f); On above-mentioned amplitude frequency characteristic, obtain following torquer dynamic parameter:
Sensitivity: be 10
(G/20), wherein G is the ordinate of amplitude frequency characteristic;
First order resonance frequency f
0: the horizontal ordinate frequency corresponding with first resonance peak of low-frequency range of amplitude frequency characteristic;
First order resonant peak value Q
0: with f
0Corresponding ordinate and the ordinate corresponding poor with 5Hz;
Second order resonant frequency f
1: the horizontal ordinate frequency corresponding with second resonance peak place of amplitude frequency characteristic high band;
Second order resonance peak Q
1: with f
1The corresponding ordinate and the ordinate of 5Hz correspondence poor;
On above-mentioned phase-frequency curve, ordinate is the phase place at corresponding frequencies place.
Introduce content of the present invention below in detail:
Choose N class frequency value in logarithmic coordinate axle equal intervals from low to high, export the sinusoidal signal of fixed amplitude A respectively successively under these different frequencies f, the choosing of amplitude should guarantee that torquer can normally shake.This sinusoidal signal is applied on the torquer, and the driving moment device produces shake.Beam of laser is shone on the reflection spot of torquer object lens, require this point that enough strong reflective light intensity is arranged, the principle of utilizing laser-Doppler to interfere dynamically records the buffeting speed at this reflection spot place on the object lens.This rate signal is carried out integration, the displacement response signal that obtains under the signal excitation that this is f at above-mentioned different frequency is Y (f)=B (f) ∠ φ (f), wherein B (f) be torquer in frequency is the amplitude that the sinusoidal signal of f drives the bottom offset response signal, and φ (f) is a torquer in frequency is displacement response signal under the sinusoidal signal of f drives and the phase differential between the drive signal.Draw the amplitude frequency and the phase-frequency curve of torquer, wherein the horizontal ordinate of amplitude frequency characteristic is the frequency f of sinusoidal drive signals, and unit is hertz (Hz), and horizontal ordinate uses logarithmic coordinate, and ordinate is and the corresponding amplitude response of frequency f
Unit is a decibel (dB); Wherein the horizontal ordinate of phase-frequency curve is the frequency f of sinusoidal drive signals, and unit is hertz (Hz), and horizontal ordinate uses logarithmic coordinate, and ordinate be and the corresponding phase response φ of frequency f (f), unit for spend (°).
On above-mentioned amplitude frequency characteristic, obtain following torquer dynamic parameter: (1) 5Hz sensitivity: find out the corresponding ordinate G in frequency f=5Hz place
1, then 5Hz sensitivity is 10
(G1/20), being called static sensitivity, static sensitivity will directly influence the dynamic perfromance and the control accuracy of torquer; (2) 200Hz sensitivity: find out the corresponding ordinate G in frequency f=200Hz place
2, then 200Hz sensitivity is 10
(G2/20), be called dynamic sensitivity; (3) first order resonance frequency f
0: the horizontal ordinate frequency corresponding with first resonance peak of low-frequency range of amplitude frequency characteristic, first order resonance frequency has directly determined the dynamic responding speed of torquer, the rigidity of expression torquer and the quality of movable member; (4) first order resonant peak value Q
0: with f
0Corresponding ordinate and the ordinate corresponding poor with 5Hz, the first order resonant peak value has reflected the damping characteristic of torquer; (5) second order resonant frequency f
1: the horizontal ordinate frequency corresponding with second resonance peak place of amplitude frequency characteristic high band, the second order resonant frequency has reflected the high frequent vibration mode that is caused by many non-linear factors; (6) second order resonance peak Q
1: with f
1The corresponding ordinate and the ordinate of 5Hz correspondence poor, the second order resonance peak should be as far as possible little, to suppress the torquer effect of non-linear, improves the servocontrol precision.
On above-mentioned phase-frequency curve, obtain following torquer dynamic parameter: (1) 1KHz phase place: with the corresponding ordinate of frequency f=1KHz; (2) 5KHz phase place: with the corresponding ordinate of frequency f=5KHz; Phase place is represented the delay degree of the response of torquer corresponding to sinusoidal signal frequency.
Claims (1)
1, a kind of method of testing of dynamic parameter of optical head moment apparatus is characterized in that this method may further comprise the steps:
(1) exports the sinusoidal signal of fixed amplitude A under the different frequency f from low to high respectively;
(2) torquer produces shake under the driving of above-mentioned sinusoidal signal;
(3) beam of laser is shone on the reflection spot of torquer object lens, record the buffeting speed at this reflection spot place on the object lens;
(4) above-mentioned rate signal is carried out integration, obtain this displacement response signal Y (f)=B (f) ∠ φ (f) under the sinusoidal signal excitation of said frequencies f, wherein B (f) be torquer in frequency is the amplitude that the sinusoidal signal of f drives the bottom offset response signal, and φ (f) is a torquer in frequency is displacement response signal under the sinusoidal signal of f drives and the phase differential between the drive signal;
(5) draw the amplitude frequency and the phase-frequency curve of torquer respectively, wherein the horizontal ordinate of amplitude frequency characteristic is the corresponding frequencies f of sinusoidal signal, and ordinate is and the corresponding amplitude response of this frequency f
Wherein the horizontal ordinate of phase-frequency curve is the corresponding frequencies f of sinusoidal signal, and ordinate is and the corresponding phase response φ of this frequency f (f);
(6) on above-mentioned amplitude frequency characteristic, obtain following torquer dynamic parameter:
Sensitivity: be 10
(G/20), wherein G is the ordinate of amplitude frequency characteristic;
First order resonance frequency f
0: the horizontal ordinate frequency corresponding with first resonance peak of low-frequency range of amplitude frequency characteristic;
First order resonant peak value Q
0: with f
0Corresponding ordinate and the ordinate corresponding poor with 5Hz;
Second order resonant frequency f
1: the horizontal ordinate frequency corresponding with second resonance peak place of amplitude frequency characteristic high band;
Second order resonance peak Q
1: with f
1The corresponding ordinate and the ordinate of 5Hz correspondence poor;
On above-mentioned phase-frequency curve, ordinate is the phase place at corresponding frequencies place.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100660290A CN100375182C (en) | 2005-04-22 | 2005-04-22 | Measuring method of dynamic parameter of optical head moment apparatus |
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| CNB2005100660290A CN100375182C (en) | 2005-04-22 | 2005-04-22 | Measuring method of dynamic parameter of optical head moment apparatus |
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| CN1687989A true CN1687989A (en) | 2005-10-26 |
| CN100375182C CN100375182C (en) | 2008-03-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100487384C (en) * | 2007-02-02 | 2009-05-13 | 清华大学深圳研究生院 | Optical head tri-dimensional torquer inclined movement characteristic curve test method |
| CN101158618B (en) * | 2007-11-01 | 2010-10-06 | 清华大学深圳研究生院 | Optical pickup device force moment machine tester and optical pickup device force moment machine characteristic testing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10289476A (en) * | 1997-04-11 | 1998-10-27 | Sony Corp | Inspection method and inspection device for biaxial objective lens actuator |
| SG75940A1 (en) * | 1999-03-24 | 2000-10-24 | Sony Prec Engineering Ct Singa | Objective lens inspection apparatus |
-
2005
- 2005-04-22 CN CNB2005100660290A patent/CN100375182C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100487384C (en) * | 2007-02-02 | 2009-05-13 | 清华大学深圳研究生院 | Optical head tri-dimensional torquer inclined movement characteristic curve test method |
| CN101158618B (en) * | 2007-11-01 | 2010-10-06 | 清华大学深圳研究生院 | Optical pickup device force moment machine tester and optical pickup device force moment machine characteristic testing method |
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| Publication number | Publication date |
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| CN100375182C (en) | 2008-03-12 |
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