CN118111669A - Method for detecting characteristic parameters of torquer of optical head - Google Patents
Method for detecting characteristic parameters of torquer of optical head Download PDFInfo
- Publication number
- CN118111669A CN118111669A CN202410255609.7A CN202410255609A CN118111669A CN 118111669 A CN118111669 A CN 118111669A CN 202410255609 A CN202410255609 A CN 202410255609A CN 118111669 A CN118111669 A CN 118111669A
- Authority
- CN
- China
- Prior art keywords
- voltage
- optical head
- torquer
- standard
- focusing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000006073 displacement reaction Methods 0.000 claims abstract description 58
- 230000005284 excitation Effects 0.000 claims abstract description 53
- 238000001514 detection method Methods 0.000 claims abstract description 51
- 238000009434 installation Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
The application discloses a method for detecting characteristic parameters of an optical head torquer. According to the detection method, voltage excitation signals are respectively input to an optical head torquer to be detected and a standard optical head torquer to be detected, so that the optical head torquer to be detected and the standard optical head torquer are caused to respectively generate a focusing error signal to be detected and a standard focusing error signal; and further, according to the difference of the two error signals, the focusing displacement range of the optical head torquer to be measured can be calculated and confirmed. The detection method can realize detection by utilizing four detectors of the DVD without building a detection system with a Doppler vibration meter, greatly reduces the detection cost, can realize the on-line detection of the torquer of the optical head to be detected, and can realize the detection on various production sites and installation sites, and the detection mode is flexible and convenient.
Description
Technical Field
The application relates to the technical field of optical head torquers, in particular to a method for detecting characteristic parameters of an optical head torquer.
Background
The optical head torquer is a core element in the optical head and is used for driving the objective lens to move in real time according to focusing and tracking error signals, so that focusing light spots can overcome fluctuation vibration of an optical disc or offset of the light spots in the focusing and track directions of the optical disc caused by other factors, and therefore the focusing light spots accurately fall on an information track of the optical disc, and high-quality data reading and writing are achieved. Therefore, the focusing and tracking error signal control of the optical head torquer is an important guarantee for realizing stable servo control of the optical head and maintaining stable read-write capability.
To produce an optical head torquer meeting the qualification requirements, the focus and tracking error signals of the optical head torquer need to be detected in a detection ratio and/or the focus and tracking displacement range of the optical head torquer is calibrated. Aiming at the optical head torquer for testing, the prior art mainly builds a detection system through a Doppler vibration meter to detect focusing and tracking error signals and determine the displacement range of focusing and tracking. Meanwhile, the existing test system is not beneficial to on-line detection in the design and production field of the optical head torquer.
Disclosure of Invention
The embodiment of the application provides a method for detecting characteristic parameters of an optical head torquer, which aims to solve one of the technical problems.
The embodiment discloses a method for detecting characteristic parameters of an optical head torquer, wherein the characteristic parameters comprise a focusing displacement range. The detection method comprises the following steps: obtaining an optical head torquer to be tested and a standard optical head torquer; respectively inputting voltage excitation signals to a focusing coil of the optical head torquer to be tested and a focusing coil of the standard optical head torquer to be tested so that the optical head torquer to be tested generates a focusing error signal to be tested, and the standard optical head torquer generates a standard focusing error signal; acquiring a first voltage when the optical head torquer to be measured is maximally displaced in the positive direction, a second voltage when the optical head torquer to be measured is maximally displaced in the negative direction and a third voltage when the vibration frequency of the optical head torquer to be measured is zero according to the focusing error signal to be measured; acquiring a standard focusing displacement range of the standard optical head torquer, and acquiring a standard voltage range from a linear region in the standard focusing error signal; and calculating the focusing displacement range of the optical head torquer to be measured according to the first voltage, the second voltage, the third voltage, the standard focusing displacement range and the standard voltage range.
In the detection method provided by the embodiment, voltage excitation signals are respectively input to the optical head torquer to be detected and the standard optical head torquer to be detected, so that the optical head torquer to be detected and the standard optical head torquer are respectively caused to generate a focusing error signal to be detected and a standard focusing error signal; and further, according to the difference of the two error signals, the focusing displacement range of the optical head torquer to be measured can be calculated and confirmed. The detection method can realize detection by utilizing A, B, C, D detectors of a photoelectric integrated detection integrated circuit (PIDC) of a DVD without building a detection system with a Doppler vibration meter, greatly reduces the detection cost, can realize the on-line detection of an optical head torquer to be detected, and can realize the detection on various production sites and installation sites, and the detection mode is flexible and convenient.
In some embodiments, the magnitude of the first voltage excitation signal is determined from the first voltage and the second voltage.
In some embodiments, the amplitude of the first voltage excitation signal is determined if the first voltage and the second voltage do not change when the amplitude of the driving voltage signal that produces the first voltage excitation signal is greater than the amplitude of the first voltage excitation signal.
In some embodiments, the focus error signal to be measured is characterized by the following equation:
FES＝Kf(Ka)(VA+VC)—(VB+VD)+offset1；
Wherein FES represents the focus error signal to be detected, and V A、VB、VC and V D are respectively voltage signals of four quadrants obtained by A, B, C, D detectors of a photoelectric integrated detection integrated circuit (PIDC); k f represents a gain value of the first voltage excitation signal, K a represents symmetry of the first voltage excitation signal, and offset1 is an offset of a voltage value of the focus error signal to be measured relative to a reference voltage.
In some embodiments, the focal displacement range of the optical head torquer to be measured is characterized by the following formula:
Xmax＝(Ut—Uref)Xs/Us；
Xmin＝(Uv—Uref)Xs/Us；
Wherein, X max is the positive maximum displacement of the optical head torquer to be measured in the focusing direction, X min is the negative maximum displacement of the optical head torquer to be measured in the focusing direction, U t represents the first voltage, U v represents the second voltage, U ref represents the third voltage, U s represents the standard voltage range, and X s represents the standard focusing displacement range.
In some embodiments, the characteristic parameter includes a tracking displacement range, and the detection method further includes: inputting a voltage excitation signal to a tracking coil of the optical head torquer to be tested so that the optical head torquer to be tested generates a tracking error signal to be tested; acquiring the number of intersection points of a curve and a transverse axis when the optical head torquer to be detected moves from the negative maximum displacement to the positive maximum displacement of the tracking direction according to the tracking error signal to be detected; the tracking displacement range is the product of the number of the intersection points and the track pitch of the standard DVD optical disc.
In some embodiments, the magnitude of the second voltage excitation signal is determined according to the number of intersecting points; if the amplitude of the driving voltage signal generating the second voltage excitation signal is larger than the amplitude of the second voltage excitation signal, the number of the crossed points is not changed, and the amplitude of the second voltage excitation signal is determined.
In some embodiments, the tracking error signal to be measured is characterized by the following equation:
TESDPD＝Kt(phase(VA+VC)—phase(VB+VD))+offset2
Wherein TES DPD represents the tracking error signal to be detected; v A、VB、VC and V D are voltage signals of four quadrants obtained by A, B, C, D four detectors of a photo-electric integrated detection integrated circuit (PIDC), respectively; phase (V A+VC) represents the sum of the phases of the voltage signals of the two quadrants obtained by the a and C detectors, phase (V B+VD) represents the sum of the phases of the voltage signals of the two quadrants obtained by the a and C detectors, K t represents the gain value of the second voltage excitation signal, and offset2 is the offset of the voltage value of the to-be-detected tracking error signal relative to the reference voltage.
In some embodiments, the first voltage excitation signal and the second voltage excitation signal are both triangular wave excitation signals.
Drawings
FIG. 1 is a schematic view of the optical path during testing of the optical head torquer.
Fig. 2 is a schematic diagram of a six-quadrant detector of a DVD optical pickup torquer.
FIG. 3 is a signal flow diagram during the optical head torquer test.
Fig. 4 is a schematic diagram of optical head torquer focus error signal generation.
Fig. 5 is a schematic view of a spot formed on PIDC in the far focus state.
FIG. 6 is a graph of the focus error signal "S" provided by one example of a test.
FIG. 7 is a graph of the optical head torquer tracking error signal and a corresponding spot effect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the following examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. The reagents not specifically and individually described in the present application are all conventional reagents and are commercially available; methods which are not specifically described in detail are all routine experimental methods and are known from the prior art.
Although the effective range of motion of the movable member is very small (both focus and tracking displacements are within 10 μm) during disc tracking by the optical head torquer, the optical head still requires large focus and tracking displacements during normal operation. For example, after the optical head is powered on, in order to determine whether a disc is present in the cartridge, the optical head torquer needs to perform disc detection, i.e., focus OK motion, and at this time, the displacement of the movable member in the focus direction is large (±300 μm or so). When the optical disc drive receives a multi-track read command or the next read track is far from the current track (typically within 10 tracks, or the optical head tracking stepper motor works), the displacement of the movable step in the tracking direction may reach ±20 μm or more. In addition, in the detection of the optical pickup torquer product, it is often necessary to detect the frequency characteristics of the movable member whose tracking displacement is within ±300 μm. Therefore, the focusing displacement range of the optical head torquer needs to be about + -500 μm, and the tracking displacement range needs to be about + -300 μm. In this range, whether the displacement-current (or displacement-voltage) relationship of the movable member is linear and the degree of linearity are also important indicators reflecting the performance of the optical pickup torquer.
Therefore, the embodiment of the application provides a method for detecting the characteristic parameters of the torquer of the optical head, wherein the characteristic parameters comprise a focusing displacement range. The detection method comprises the following steps: obtaining an optical head torquer to be tested and a standard optical head torquer; respectively inputting voltage excitation signals to a focusing coil of the optical head torquer to be tested and a focusing coil of the standard optical head torquer to be tested so that the optical head torquer to be tested generates a focusing error signal to be tested, and the standard optical head torquer generates a standard focusing error signal; acquiring a first voltage when the optical head torquer to be measured is maximally displaced in the positive direction, a second voltage when the optical head torquer to be measured is maximally displaced in the negative direction and a third voltage when the vibration frequency of the optical head torquer to be measured is zero according to the focusing error signal to be measured; acquiring a standard focusing displacement range of the standard optical head torquer, and acquiring a standard voltage range from a linear region in the standard focusing error signal; and calculating the focusing displacement range of the optical head torquer to be measured according to the first voltage, the second voltage, the third voltage, the standard focusing displacement range and the standard voltage range.
In the detection method provided by the embodiment, voltage excitation signals are respectively input to the optical head torquer to be detected and the standard optical head torquer to be detected, so that the optical head torquer to be detected and the standard optical head torquer are respectively caused to generate a focusing error signal to be detected and a standard focusing error signal; and further, according to the difference of the two error signals, the focusing displacement range of the optical head torquer to be measured can be calculated and confirmed. The detection method can realize detection by utilizing A, B, C, D detectors of the photoelectric integrated detection integrated circuit (PIDC) of the DVD without building a detection system with a Doppler vibration meter, greatly reduces the detection cost, can realize the on-line detection of the torquer of the optical head to be detected, and can realize the detection on various production sites and installation sites, and the detection mode is flexible and convenient.
Fig. 2 shows a schematic view of the optical path inside the optical head torquer during operation. The laser emitted by the laser passes through the diffraction grating, the polarization beam splitter, the collimator and the objective lens in sequence and then is focused on the disc information layer. The reflected light is focused on the photodetector PDIC after passing through the objective lens, collimator, polarizing beam splitter and cylindrical mirror in sequence. Fig. 3 shows the structure of the PDIC of the DVD torquer, and the embodiment of the present application can realize detection by using A, B, C, D four detectors therein.
FIG. 4 is a signal flow diagram during an optical head torquer test; the reflected light is irradiated on the PDIC to obtain A, B, C, D four paths of signals.
Fig. 5 shows a focus error signal "S" curve obtained by the test method provided by the embodiment. In the figure, when the distance between the objective lens and the disc information layer is equal to the focal length of the objective lens (this time, referred to as a positive focal state), the amounts of reflected light in the four quadrants of the photodetector are the same, so that the difference between the diagonal voltage sums is 0, and the Focus Error Signal (FES) is zero, which is the state corresponding to point 2 in the figure. When in the far focus state, i.e. the distance between the objective lens and the disc information layer is larger than the focal length of the objective lens, the sum of the voltages in quadrant a and quadrant C is smaller than the sum of the voltages in quadrant B and quadrant D at this time because the refractive power of the objective lens for light is reduced, and thus FES <0 corresponds to the point 3 state in fig. 6, and finally the spot formed on the PDIC is as shown in fig. 7. When in the near-focus state, FES >0 corresponds to point 1 in fig. 6.
Some embodiments provide that the focus error signal to be measured and the standard focus error signal are both characterized by the following formula:
FES＝Kf(Ka)(VA+VC)—(VB+VD)+offset1；
Wherein FES represents the focus error signal to be detected, and V A、VB、VC and V D are respectively voltage signals of four quadrants obtained by A, B, C, D detectors of a photoelectric integrated detection integrated circuit (PIDC); k f represents a gain value of the first voltage excitation signal, K a represents symmetry of the first voltage excitation signal, and offset1 is an offset of a voltage value of the focus error signal to be measured relative to a reference voltage. The reference voltage is a fe signal or a te signal generated by hardware.
In some embodiments, the magnitude of the first voltage excitation signal is determined from the first voltage and the second voltage.
In some embodiments, the amplitude of the first voltage excitation signal is determined if the first voltage and the second voltage do not change when the amplitude of the driving voltage signal that produces the first voltage excitation signal is greater than the amplitude of the first voltage excitation signal.
In practice, the symmetry of the curve may not be satisfactory due to circuit errors and external disturbances, and the symmetry and gain of the "S" curve may be varied by varying the parameters K f and K a. Meanwhile, changing the magnitude of the offset1 parameter may change the offset of the FES with respect to the reference voltage.
For example, fig. 5 shows a curve of "K f＝1.2,Ka =1.00" of the measured focus error signal "S" obtained at this time. The maximum value of the signal is 1.545V, the minimum value is 497.5mV, the peak value is 1.048V, and the reference voltage is 1.005V, and the symmetry of the maximum value and the minimum value of the curve relative to the reference voltage is good. If the symmetry is worse, the parameter K a can be adjusted until the symmetry meets the requirement. In addition, the gain size may be changed as desired, which may be accomplished by changing the parameter K f.
In order to determine the determination of K f, K a and offset1 in the FES characterization formula, the determination can be performed by a standard optical head torquer so as to eliminate the influence of the same set of test equipment, and thus, the more accurate focusing displacement range of the optical head torquer to be tested can be obtained.
The focusing displacement range testing process of the optical head torquer to be tested disclosed in some embodiments comprises the following steps:
1) Signal test of optical head torquer to be tested
And inputting a first voltage excitation signal with the amplitude of W to a focusing coil of the optical head torquer to be tested, so that the optical head torquer to be tested vibrates reciprocally along the focusing direction, and an S-shaped curve Fx of a focusing error signal is generated. The voltage range corresponding to the linear region of the moment to be measured is recorded at this time: the focus direction positive maximum displacement X max corresponds to the voltage signal U t and the focus direction negative maximum displacement X min corresponds to the voltage signal U v. The first voltage excitation signal amplitude W may be determined by the manufacturer, or the values thereof may be determined by determining that U t and U v are no longer changed when the driving voltage signal amplitude of the first voltage excitation signal is greater than W.
2) Signal test of standard optical head torquer
And inputting a first voltage excitation signal with the amplitude W to a focusing coil of the standard optical head torquer, so that the standard optical head torquer vibrates reciprocally along the focusing direction and generates an S-shaped curve Fs of a focus error signal. And the voltage range U s of the linear region of the curve Fs is recorded, in combination with the actual displacement range X s calibrated by the standard torquer.
3) Determining focusing displacement range of torquer of optical head to be tested
Xmax＝(Ut—Uref)Xs/Us；
Xmin＝(Uv—Uref)Xs/Us；
Wherein, X max is the positive maximum displacement of the optical head torquer to be measured in the focusing direction, X min is the negative maximum displacement of the optical head torquer to be measured in the focusing direction, U t represents the first voltage, U v represents the second voltage, U ref represents the third voltage, U s represents the standard voltage range, and X s represents the standard focusing displacement range.
In some embodiments, the characteristic parameter includes a tracking displacement range, and the detection method further includes: inputting a voltage excitation signal to a tracking coil of the optical head torquer to be tested so that the optical head torquer to be tested generates a tracking error signal to be tested; acquiring the number of intersection points of a curve and a transverse axis when the optical head torquer to be detected moves from the negative maximum displacement to the positive maximum displacement of the tracking direction according to the tracking error signal to be detected; the tracking displacement range is the product of the number of the intersection points and the track pitch of the standard DVD optical disc.
In some embodiments, the magnitude of the second voltage excitation signal is determined according to the number of intersecting points; if the amplitude of the driving voltage signal generating the second voltage excitation signal is larger than the amplitude of the second voltage excitation signal, the number of the crossed points is not changed, and the amplitude of the second voltage excitation signal is determined.
In some embodiments, during the tracking displacement reaction test of the torquer of the optical head to be tested, it is first ensured that the disc and the torquer are in a focusing state, i.e. the FES fluctuates within a small range, and then the generation of the focusing error signal can be completed. And the disc initially may continuously span multiple tracks due to the fact that the center of rotation of the disc and the center of tracking motion are not coincident, which occurs as shown in fig. 6. When testing the performance of the torquer, the torquer needs to be locked on a certain track, namely the tracking function is normally operated.
As shown in fig. 7, when the focused spot is in the middle of the track of the information layer of the optical disc (corresponding to the q-point state in fig. 7), the reflected laser beam passes through the objective lens and then irradiates the middle of the four photodetectors A, B, C, D in the middle of the PDIC. At this time, A, C and B, D have the same phase, tes=0; when the focused spot is on the left side of the information layer of the optical disc (corresponding to the state of the p-point in fig. 7), the reflected laser beam passes through the objective lens and irradiates the left side of the four photodetectors in the middle of the PDIC. A. The phase of the C detector signal sum is advanced from the phase of B, D detector signal sum by a positive phase, TES >0. Similarly, when the focus spot is on the right side of the information layer of the optical disc (corresponding to the state of the r-point in fig. 7), TES <0.
In some embodiments, the tracking error signal to be measured is characterized by the following equation:
TESDPD＝Kt(phase(VA+VC)—phase(VB+VD))+offset2
Wherein TES DPD represents the tracking error signal to be detected; v A、VB、VC and V D are voltage signals of four quadrants obtained by A, B, C, D four detectors of a photo-electric integrated detection integrated circuit (PIDC), respectively; phase (V A+VC) represents the sum of the phases of the voltage signals of the two quadrants obtained by the a and C detectors, phase (V B+VD) represents the sum of the phases of the voltage signals of the two quadrants obtained by the a and C detectors, K t represents the gain value of the second voltage excitation signal, and offset2 is the offset of the voltage value of the to-be-detected tracking error signal relative to the reference voltage.
The tracking displacement range test process of the optical head torquer to be tested disclosed in some embodiments comprises the following steps:
And inputting a second voltage excitation signal with the amplitude of V into the tracking coil of the optical head torquer to be tested, so that the optical head torquer to be tested vibrates reciprocally along the tracking direction, a sawtooth-shaped curve Fy of a tracking error signal is generated, and the number n of intersection points of the curve and a transverse shaft when the optical head torquer moves from the negative maximum displacement to the positive maximum displacement of the tracking direction is recorded. The value of V is determined by the manufacturer, and whether the value of the driving voltage signal is proper can be determined by judging whether n is not changed any more when the amplitude of the driving voltage signal is larger than V.
Therefore, the tracking displacement range (X t) is the product of the number of the intersection points and the track pitch (p) of the standard DVD optical disc; x t = n X p.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application.
Claims (9)
1. A method for detecting a torquer characteristic parameter of an optical head, the characteristic parameter including a focus displacement range, the method comprising:
obtaining an optical head torquer to be tested and a standard optical head torquer;
Respectively inputting voltage excitation signals to a focusing coil of the optical head torquer to be tested and a focusing coil of the standard optical head torquer to be tested so that the optical head torquer to be tested generates a focusing error signal to be tested, and the standard optical head torquer generates a standard focusing error signal;
Acquiring a first voltage when the optical head torquer to be measured is maximally displaced in the positive direction, a second voltage when the optical head torquer to be measured is maximally displaced in the negative direction and a third voltage when the vibration frequency of the optical head torquer to be measured is zero according to the focusing error signal to be measured;
acquiring a standard focusing displacement range of the standard optical head torquer, and acquiring a standard voltage range from a linear region in the standard focusing error signal;
and calculating the focusing displacement range of the optical head torquer to be measured according to the first voltage, the second voltage, the third voltage, the standard focusing displacement range and the standard voltage range.
2. The detection method according to claim 1, wherein the amplitude of the first voltage excitation signal is determined according to the first voltage and the second voltage.
3. The detection method according to claim 2, wherein the amplitude of the first voltage excitation signal is determined if the first voltage and the second voltage are unchanged when the amplitude of the driving voltage signal generating the first voltage excitation signal is larger than the amplitude of the first voltage excitation signal.
4. The detection method according to claim 1, wherein the focus error signal to be detected and the standard focus error signal are each characterized by the following formula:
FES＝Kf(Ka)(VA+VC)—(VB+VD)+offset1；
Wherein FES represents the focus error signal to be detected, and V A、VB、VC and V D are respectively voltage signals of four quadrants obtained by A, B, C, D detectors of a photoelectric integrated detection integrated circuit (PIDC); k f represents a gain value of the first voltage excitation signal, K a represents symmetry of the first voltage excitation signal, and offset1 is an offset of a voltage value of the focus error signal to be measured relative to a reference voltage.
5. The detection method according to any one of claims 1 to 4, wherein the focal displacement range of the torquer of the optical head to be detected is represented by the following formula:
Xmax＝(Ut—Uref)Xs/Us；
Xmin＝(Uv—Uref)Xs/Us；
Wherein, X max is the positive maximum displacement of the optical head torquer to be measured in the focusing direction, X min is the negative maximum displacement of the optical head torquer to be measured in the focusing direction, U t represents the first voltage, U v represents the second voltage, U ref represents the third voltage, U s represents the standard voltage range, and X s represents the standard focusing displacement range.
6. The detection method according to claim 1, the characteristic parameter including a tracking displacement range, the detection method further comprising:
inputting a voltage excitation signal to a tracking coil of the optical head torquer to be tested so that the optical head torquer to be tested generates a tracking error signal to be tested;
Acquiring the number of intersection points of a curve and a transverse axis when the optical head torquer to be detected moves from the negative maximum displacement to the positive maximum displacement of the tracking direction according to the tracking error signal to be detected;
the tracking displacement range is the product of the number of the intersection points and the track pitch of the standard DVD optical disc.
7. The detection method according to claim 5, wherein the amplitude of the second voltage excitation signal is determined according to the number of intersecting points;
If the amplitude of the driving voltage signal generating the second voltage excitation signal is larger than the amplitude of the second voltage excitation signal, the number of the crossed points is not changed, and the amplitude of the second voltage excitation signal is determined.
8. The detection method according to claim 5 or 6, wherein the tracking error signal to be detected is characterized by the following formula:
TESDPD＝Kt(phase(VA+VC)—phase(VB+VD))+offset2
Wherein TES DPD represents the tracking error signal to be detected; v A、VB、VC and V D are voltage signals of four quadrants obtained by A, B, C, D four detectors of a photo-electric integrated detection integrated circuit (PIDC), respectively; phase (V A+VC) represents the sum of the phases of the voltage signals of the two quadrants obtained by the a and C detectors, phase (V B+VD) represents the sum of the phases of the voltage signals of the two quadrants obtained by the a and C detectors, K t represents the gain value of the second voltage excitation signal, and offset2 is the offset of the voltage value of the to-be-detected tracking error signal relative to the reference voltage.
9. The detection method according to any one of claims 1 to 8, wherein the first voltage excitation signal and the second voltage excitation signal are both triangular wave excitation signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410255609.7A CN118111669A (en) | 2024-03-06 | 2024-03-06 | Method for detecting characteristic parameters of torquer of optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410255609.7A CN118111669A (en) | 2024-03-06 | 2024-03-06 | Method for detecting characteristic parameters of torquer of optical head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118111669A true CN118111669A (en) | 2024-05-31 |
Family
ID=91216095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410255609.7A Pending CN118111669A (en) | 2024-03-06 | 2024-03-06 | Method for detecting characteristic parameters of torquer of optical head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118111669A (en) |
-
2024
- 2024-03-06 CN CN202410255609.7A patent/CN118111669A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0141396B1 (en) | Access device for positioning a light beam to a desired guide groove of an optical memory apparatus | |
| US5361244A (en) | Optical head and information recording apparatus | |
| KR850001003B1 (en) | Focus detector for an optical disc playback system | |
| US6407968B1 (en) | Optical information recording/reproducing apparatus having focus error signal compensation | |
| JPH05120720A (en) | Information recording and reproducing device | |
| US20070159936A1 (en) | Optical head unit and optical disc apparatus | |
| KR950010419B1 (en) | Tracking signal generating apparatus of coarse acturator | |
| JP3720851B2 (en) | Optical scanning device | |
| KR930002880B1 (en) | Method and apparatus for adjusting target position for focusing light beam | |
| JPH10149548A (en) | Land/group detector | |
| JP3513125B2 (en) | Optical head and optical disk device | |
| CN118111669A (en) | Method for detecting characteristic parameters of torquer of optical head | |
| JPH07201050A (en) | Optical recording and reproducing device | |
| US5255252A (en) | Light spot position detector and optical head | |
| US7616539B2 (en) | Optical disc apparatus, tracking control method, and integrated circuit | |
| JP2000251280A (en) | Pickup performance measuring method and apparatus for optical disk | |
| JP2796888B2 (en) | Optical disk drive | |
| JPH08167160A (en) | Optical disk device | |
| JPH0528525A (en) | Track positional deviation signal generator for optical disk device and tracking controller | |
| JP4573329B2 (en) | Optical disk device | |
| US7957242B2 (en) | Servo parameter detection method and optical pickup device using the same | |
| KR20030035901A (en) | Optical disk device and recording/reproducing method | |
| KR100888590B1 (en) | Method and apparatus for detecting radial tilt | |
| JP3581941B2 (en) | Optical disc apparatus and method for adjusting light beam projection position | |
| JP2626644B2 (en) | Tracking method and optical disk device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |