CN100487384C - Optical head tri-dimensional torquer inclined movement characteristic curve test method - Google Patents
Optical head tri-dimensional torquer inclined movement characteristic curve test method Download PDFInfo
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- CN100487384C CN100487384C CNB2007100731859A CN200710073185A CN100487384C CN 100487384 C CN100487384 C CN 100487384C CN B2007100731859 A CNB2007100731859 A CN B2007100731859A CN 200710073185 A CN200710073185 A CN 200710073185A CN 100487384 C CN100487384 C CN 100487384C
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Abstract
The invention discloses a testing method for oblique kinetic characteristic curve of 3-D moment device with optical head. Under different frequencies f from low to high sine signal with fixed amplitude A is outputted. The moment device driven by sine signal generates jitter and a beam of laser irradiates the reflecting point of objective lens of moment device to measure jitter speed at the position of reflecting point. Speed signal is integrated to obtain displace responding signal of said frequencies f under the influence of sine signal excitation. Characteristic curves of amplitude frequency and phase frequency at the position of reflecting point are drawn respectively. Compared with previous testing method, the invention need not increase other measuring equipment and uses a laser vibration measuring instrument to obtain oblique kinetic characteristic curve of 3-D moment device. It is provided with easy realization and strong practicability.
Description
[technical field]
The present invention relates to a kind of method of testing of optical head tri-dimensional torquer inclined movement characteristic curve, relate in particular to the method for testing of optical head tri-dimensional torquer inclined movement characteristic curve 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.Therefore along with the increase of CD capacity, the inclination franchise of CD is more and more littler in the CD-ROM system, has occurred doing focusing, has tracked and the three-dimensional moment device of banking motion.Its role is to, read the error signal of obtaining in the process according to optical head at CD, promptly focus on, track and tilt error signal, drive the object lens motion in real time, the skew of hot spot on disc that the fluctuating vibration that makes focal beam spot can overcome CD brings, thereby accurately drop on the information track of CD, realize high-quality read-write.
The dynamic property of torquer will directly determine the control accuracy that servo-drive 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 banking motion family curve is the important evidence of reflection tri-dimensional torquer inclined movement performance.
" method of testing of dynamic parameter of optical head moment apparatus " (Chinese patent application number 200510066029.0) discloses a kind of method of testing of torquer dynamic parameter, this method can not be measured banking motion for measuring the direct method of testing that torquer focuses on and tracks and move.
[summary of the invention]
Fundamental purpose of the present invention is: the method for testing that proposes a kind of easy realization, practical optical head tri-dimensional torquer inclined movement characteristic curve.
For achieving the above object, the present invention proposes a kind of method of testing of optical head tri-dimensional torquer inclined movement characteristic curve, comprises the steps:
1) gets two test point B and C in the left and right sides of the object lens symmetry of torquer apart from the r place;
2) export the sinusoidal signal of fixed amplitude A under the different frequency f from low to high respectively, torquer produces shake under the driving of sinusoidal signal;
3) adopt beam of laser to be radiated on the test point B of torquer object lens, record the buffeting speed of this test point at the focus direction place; Adopt beam of laser to be radiated on the test point C of torquer object lens, record the buffeting speed of this test point at the focus direction place;
4) described buffeting speed signal is carried out integration, obtain a B and C displacement response signal under the sinusoidal signal excitation of said frequencies f in focus direction
With
A wherein
B, A
CBe respectively B and C point on the torquer frequency be under the sinusoidal signal of f drives in the amplitude of focus direction displacement response signal,
Being respectively B and C point on the torquer is at the displacement response signal of focus direction and the phase differential between the drive signal under the sinusoidal signal of f drives in frequency;
5) obtain the angle of inclination of object lens in the difference of the plural displacement of focus direction by B and C point:
6) draw amplitude frequency and the phase-frequency curve that α (f) obtains the three-dimensional moment device.
Above-mentioned method of testing also comprises frequency and amplitude that step 7) is obtained torsional resonance by the x coordinate figure and the y coordinate figure of the torsional resonance peak correspondence on the amplitude frequency characteristic; Torsional resonance frequency is phase place corresponding under the resonant frequency in phase place corresponding on the phase-frequency curve.
Owing to adopted above scheme, the method of testing of the optical head tri-dimensional torquer inclined movement characteristic curve that the present invention proposes, previously used relatively method of testing, this method need not increase other testing apparatus, use a laser vibration measurer, adopt the method for multimetering, can obtain tri-dimensional torquer inclined movement characteristic curve, easily realize, practical.
The inventive method is applicable to the tilt and vibration of three-dimensional moment device and two-dimentional torquer owing to focus on and the motion of crosstalking that the motion that tracks is crosstalked and caused.
[description of drawings]
Fig. 1 is the amplitude frequency characteristic curve diagram of the embodiment of the invention;
Fig. 2 is the phase-frequency curve figure of the embodiment of the invention.
[embodiment]
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
The method of testing of the optical head tri-dimensional torquer inclined movement characteristic curve that the present invention proposes is exported the sinusoidal signal of fixed amplitude A respectively under the different frequency f at first from low to high; Torquer produces shake under the driving of sinusoidal signal; Beam of laser is radiated on the reflection spot of torquer object lens, records the buffeting speed at this reflection spot place; Rate signal is carried out integration, obtain this displacement response signal under the sinusoidal signal excitation of said frequencies f; Just can draw out amplitude frequency and the phase-frequency curve of torquer respectively at this reflection spot place; Use above-mentioned means of testing, measure two the some B and the C of the object lens left and right sides, obtain the dynamic characteristic G of focus direction
B(f), G
C(f); The two difference of doing plural displacement obtains tri-dimensional torquer inclined movement characteristic curve α (f); From this banking motion curve, available parameter has: torsional resonance frequency, resonance amplitude, and the corresponding down phase place of resonant frequency.
Concrete steps are: at first make torquer be in free state; Choose N class frequency value in logarithmic coordinate axle equal intervals from low to high, export the sinusoidal signal of fixed amplitude I 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, makes torquer under the driving of above-mentioned sinusoidal signal, produce shake in focus direction or tracking direction.Two test point B and C are got apart from the r place in the left and right sides in the object lens symmetry of torquer, beam of laser is shone on one of them test point of torquer object lens, require this point that enough strong reflective light intensity is arranged, the principle of utilizing laser-Doppler to interfere, dynamically record the buffeting speed that this reflection spot on the object lens is in focus direction, in like manner measure the another one test point.The rate signal that obtains is carried out integration, obtain under the sinusoidal signal excitation that this is f in said frequencies displacement response signal in focus direction
With
The two difference of doing plural displacement is obtained
A wherein
B(f), A
C(f) be torquer frequency be under the sinusoidal signal of f drives in the amplitude of the displacement response signal of focus direction,
Be torquer in frequency be the phase differential between focus direction displacement response signal and drive signal under the sinusoidal signal of f drives.Draw the amplitude frequency and the phase-frequency curve of torquer tilt and vibration, wherein the horizontal ordinate of amplitude frequency characteristic is the frequency f of sinusoidal drive signals, 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: torsional resonance frequency, resonance amplitude, and the corresponding down phase place of resonant frequency.Banking motion performance diagram as shown in Figure 1 and Figure 2, wherein Fig. 1 is the amplitude frequency characteristic, and the x axle is frequency (Hz), and the y axle is amplitude (dB); Figure 2 shows that phase-frequency curve, the x axle is frequency (Hz), and the y axle is phase place (deg).Frequency and amplitude that the x coordinate figure of the torsional resonance peak correspondence on the amplitude frequency characteristic and y coordinate figure are exactly torsional resonance.Torsional resonance frequency is phase place corresponding under the resonant frequency in phase place corresponding on the phase-frequency curve.
Claims (2)
1, a kind of method of testing of optical head tri-dimensional torquer inclined movement characteristic curve comprises the steps:
1) gets two test point B and C in the left and right sides of the object lens symmetry of torquer apart from the r place;
2) export the sinusoidal signal of fixed amplitude A under the different frequency f from low to high respectively, torquer produces shake under the driving of sinusoidal signal;
3) adopt beam of laser to be radiated on the test point B of torquer object lens, record the buffeting speed that this test point is in focus direction; Adopt beam of laser to be radiated on the test point C of torquer object lens, record the buffeting speed that this test point is in focus direction;
4) described buffeting speed signal is carried out integration, obtain a B and C displacement response signal under the sinusoidal signal excitation of said frequencies f in focus direction
With
A wherein
B, A
CBe respectively B and C point on the torquer frequency be under the sinusoidal signal of f drives in the amplitude of the displacement response signal of focus direction,
Being respectively B and C point on the torquer is at the displacement response signal of focus direction and the phase differential between the drive signal under the sinusoidal signal of f drives in frequency;
5) obtain the angle of inclination of object lens in the difference of the plural displacement of focus direction by B and C point:
6) draw amplitude frequency and the phase-frequency curve that α (f) obtains the three-dimensional moment device.
2, method of testing as claimed in claim 1 is characterized in that: also comprise frequency and amplitude that step 7) is obtained torsional resonance by the x coordinate figure and the y coordinate figure of the torsional resonance peak correspondence on the amplitude frequency characteristic; Torsional resonance frequency is phase place corresponding under the torsional resonance frequency in phase place corresponding on the phase-frequency curve.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100731859A CN100487384C (en) | 2007-02-02 | 2007-02-02 | Optical head tri-dimensional torquer inclined movement characteristic curve test method |
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| CNB2007100731859A CN100487384C (en) | 2007-02-02 | 2007-02-02 | Optical head tri-dimensional torquer inclined movement characteristic curve test method |
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| CN101078638A CN101078638A (en) | 2007-11-28 |
| CN100487384C true CN100487384C (en) | 2009-05-13 |
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| CN108489595A (en) * | 2018-03-20 | 2018-09-04 | 南京凯奥思数据技术有限公司 | Laser-Doppler three-dimensional vibrating test method and system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467462A (en) * | 1980-10-25 | 1984-08-21 | Olympus Optical Co., Ltd. | Signal detection system for use in an optically reproducing apparatus |
| CN1184247A (en) * | 1996-12-06 | 1998-06-10 | 三星电子株式会社 | Apparatus for measuring degree of inclination of objective lens for optical pickup |
| EP1124227A2 (en) * | 2000-02-10 | 2001-08-16 | Sony Corporation | Optical pickup, tilt detection apparatus, tilt detection method and optical disk apparatus |
| CN1687990A (en) * | 2005-04-22 | 2005-10-26 | 清华大学 | Method for testing axial rotation defect of optical head moment apparatus |
| CN1687989A (en) * | 2005-04-22 | 2005-10-26 | 清华大学 | Measuring method of dynamic parameter of optical head moment apparatus |
| CN1687988A (en) * | 2005-04-22 | 2005-10-26 | 清华大学 | Method for multi-condition testing of optical head moment apparatus dynamic pappmeter |
| CN1726540A (en) * | 2002-11-05 | 2006-01-25 | 夏普株式会社 | Optical disk drive device and method of correcting tilt of optical pickup |
-
2007
- 2007-02-02 CN CNB2007100731859A patent/CN100487384C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467462A (en) * | 1980-10-25 | 1984-08-21 | Olympus Optical Co., Ltd. | Signal detection system for use in an optically reproducing apparatus |
| CN1184247A (en) * | 1996-12-06 | 1998-06-10 | 三星电子株式会社 | Apparatus for measuring degree of inclination of objective lens for optical pickup |
| EP1124227A2 (en) * | 2000-02-10 | 2001-08-16 | Sony Corporation | Optical pickup, tilt detection apparatus, tilt detection method and optical disk apparatus |
| CN1726540A (en) * | 2002-11-05 | 2006-01-25 | 夏普株式会社 | Optical disk drive device and method of correcting tilt of optical pickup |
| CN1687990A (en) * | 2005-04-22 | 2005-10-26 | 清华大学 | Method for testing axial rotation defect of optical head moment apparatus |
| CN1687989A (en) * | 2005-04-22 | 2005-10-26 | 清华大学 | Measuring method of dynamic parameter of optical head moment apparatus |
| CN1687988A (en) * | 2005-04-22 | 2005-10-26 | 清华大学 | Method for multi-condition testing of optical head moment apparatus dynamic pappmeter |
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