CN1176460C - Optical disk device - Google Patents

Optical disk device Download PDF

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Publication number
CN1176460C
CN1176460C CNB001030310A CN00103031A CN1176460C CN 1176460 C CN1176460 C CN 1176460C CN B001030310 A CNB001030310 A CN B001030310A CN 00103031 A CN00103031 A CN 00103031A CN 1176460 C CN1176460 C CN 1176460C
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China
Prior art keywords
signal
lens
mentioned
channel
test section
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CNB001030310A
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Chinese (zh)
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CN1273413A (en
Inventor
渡边克也
司
藤亩健司
通
石桥广通
冈田雄
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication of CN1273413A publication Critical patent/CN1273413A/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0912—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by push-pull method
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/094—Methods and circuits for servo offset compensation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor

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  • Optical Recording Or Reproduction (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

To perform tracking control with a high degree of reliability by driving a moving part of an optical head and controlling it so that a light beam correctly scans on the track according to an output signal of a phase difference track deviation detecting part for converting the deviation into a signal corresponding to a positional relation between the optical beam and the track. Reflected light from a disk 101 is made incident to 4-split photo- detector 114 via a condenser lens 113. A matrix computing element 116 calculates sums of various combinations of the detecting parts A-D of the 4-split photo-detector 114, and generates a phase difference tracking error signal (signal TE). An A/D 112 converts the signal TE, and inputs a signal phTE to a DSP 132, and the DSP 132 outputs a signal TRD and makes a current flow through a tracking actuator 103 via a synthesizing circuit 133 and a driving circuit 134. The converging lens 105 is driven in the tracking direction, and tracking control is performed so that a light beam pot 107 correctly scans the tracks.

Description

Optical disc apparatus
Technical field
The present invention relates to a kind of optical disc apparatus, be used to use the optical disc apparatus of the signal that light source such as laser optical ground tracer signal and regenerate this signal that is recorded or regeneration on information carrier writes down in advance optically, particularly have the control bundle spot optical disc apparatus of the tracking Control of scanning channel correctly.
Background technology
In the optical disc apparatus that record regenerating is used, use light sources such as laser optical ground tracer signal and this signal that is recorded of regenerating on information carrier of optical head.In the special-purpose optical disc apparatus of regeneration, the signal that light sources such as the laser regeneration of use optical head is write down in advance optically.In CD, signal is formed shapes such as groove line along channel.In record regenerating, carry out tracking Control, optical head is controlled as along channel and moves.In the past, handlebar had been introduced phase differential and had been followed the tracks of the follow-up control apparatus (reporting OPE96-150 (1997-02) with reference to electronic information communication association skill) of detection method and control mode of learning thereof as the follow-up control apparatus that is used to CD-ROM driving, DVD-ROM driving etc.In the past follow-up control apparatus describes to this with Fig. 1～Fig. 4 below.
Fig. 1 represents the detection principle of phase differential tracking error signal (hereinafter referred to as phase differential TE signal).When bundle spot that optical head produces by the groove line of the formation channel on the CD on the time, its catoptrical intensity apperance changes in time.Hot spot is expressed in the drawings along 3 situations that the groove line moves.Shown in the upside of figure, when the center of hot spot by the groove line was the center of channel, the apperance left and right symmetrically changed.When the left side at the center of hot spot by the groove line, apperance is docile and obedient the clockwise rotation change, and when the right side of hot spot by vis-a-vis, apperance is docile and obedient contrary pin direction rotation change.So along with the center that the bundle spot departs from the groove line, the rotation change of this apperance becomes more obvious.Phase difference method is exactly a method of utilizing the change-detection tracking error signal of this apperance, uses 4 subregion photodetectors.Shown in the downside of figure, the diagonal angle and 2 signal phases that obtain by 4 surveyed areas of photodetector are compared, from the position deviation between the center that the leading amount or the hysteresis of phase place detects bundle spot and groove line.
Generation principle and modification method thereof to the biasing of this phase differential tracking error describes below.By means of tracking Control, corresponding with this mobile phase when mobile thing lens make hot spot follow the tracks of channel prejudicially, the reflected light on the photodetector also moves.The degree of depth at the groove line is under the situation of λ/4 (λ is the wavelength of light beam), and catoptrical apperance becomes symmetry for optical axis center, even if the reflected light on the photodetector moves, also can detect correct tracking error signal.But under the degree of depth of groove line was the situation different with λ/4, catoptrical apperance did not become symmetry for optical axis center, therefore, when the reflected light on the photodetector moves, produces biasing on tracking error signal.
Fig. 2 is the generation principle that is used to illustrate this biasing, expression bundle spot in channel in the heart and be positioned at the groove line the end situation the reflected light apperance and under this state the waveform of each detection signal on photodetector during across the groove line.Photodetector is made up of the photo detection area A～D of 4 subregions.The thing lens that focus the beam on the CD are arranged possessing on the optical head, but shown in (b), the degree of depth at the groove line is under the situation of λ/4, even if therefore the displacement of the lens of lens causes the light beam apperance on the photodetector to move, the phase difference between signals of the signal of regional A, the B of photodetector and zone C, D can not produce yet.Under the degree of depth of the groove line situation different with λ/4, if do not have lens displacements then shown in (c), the phase difference between signals of the signal of regional A, the B of photodetector and zone C, D can not produce, if but lens displacements is arranged then as (d) shown in, generation phase differential when the light beam apperance on the photodetector moves.At this moment, the signal of regional A, the B of photodetector is also different with the level of the signal of zone C, D, therefore, produces biasing on phase differential TE.
As shown in Figure 3, the biasing of moving the tracking error signal caused of thing lens is by regulating among 4 photo detection areas along phase place (phase place of the tangential direction) cancellation of the signal of 2 the photo detection areas outputs in the front and back of radially dividing of CD.That is to say, make the leading or hysteresis of phase place by the signal of 2 front or rear zone outputs, from the signal plus of the photo detection area at each diagonal angle and respectively signal 2 values in (A+C) and zone (B+D), detect the phase differential of 22 value signals by phase comparator, obtain phase differential tracking error (TE) signal by low-pass filter again.
The symmetric example that Fig. 4 represents to change this phase adjusted amount and measures the tracking error signal that moves for lens.Like this, in follow-up control apparatus in the past, the biasing of (in the lens displacement) for because of the irregular mobile lens that produces of the groove line degree of depth that when CD is shaped, produces the time, only by means of the correction of phase adjusted amount to lens displacement carry out tracking Control, produce the good tracking error signal of symmetry.
Also have, the device that uses 3 bundle modes is as other the follow-up control apparatus that is adopted among the CD-ROM.Used 3 to restraint the follow-up control apparatus in the past of modes with Fig. 5 and Fig. 6 for this, carried out simple declaration.3 bundle modes use diffraction grating to generate 2 secondary bundle A, B of ± 1 diffraction light in the front and back of the main beam of regeneration middle signal on position as shown in Figure 6.2 secondary bundle A, B are only striding a little a little on channel (groove line), remaining part to portion (not having groove line part), arrives photodetector after the light beam of this part is reflected at so-called mirror.
Each signal of this photodetector is imported into differential amplifier shown in Figure 5 169, can obtain offset signal.Shown in Fig. 5 (b), when main beam scanning channel center, detect identical light quantity from 2 secondary bundle A, B, therefore, the road offset signal is 0.When main beam departed from channel center, shown in Fig. 5 (a), (c), the diffraction that the information track line of 2 secondary bundle A, B is produced became uneven, with the situation of the polarity of this Fig. 5, (a) for+, the situation of (c) for-can obtain dipolar error signal.Promptly can obtain being partial to the information on which limit of 1 channel (groove line string) and the information of bias.This information shows as the polarity and the amplitude of 3 bundle channel offset signal.So, can realize tracking Control by the thing lens being controlled according to this 3 bundle channel offset signal.
3 bundle channel offset signal are not subject to the influence of irregular and disc tilt of the groove line of CD in general, but amplitude can change the biasing that imbalance produced that produces or photodetector irregular by the intensity of pair bundle A, B with the reflectivity of CD.In follow-up control apparatus in the past, revise this biasing by means of on differential amplifier, adding the differential gain balancing circuitry and applying bias voltage etc.
When the follow-up control apparatus of phase differential was in the past used in explanation, in optical disc apparatus, optical head was made up of opticses such as thing lens, polarization element, photodetectors.Under normal condition, shown in Fig. 7 (a), the thing lens are positioned at the center of photodetector.But, shown in Fig. 7 (b), the alignment error of optics can cause producing depart from (optical axis falls through) of thing lens center under original state, set under the vertical situation at device, the thing lens can be because of conducting oneself with dignity into hang, under original state, the thing lens may move apart the center (claiming that this state is the lens displacements) of thing lens significantly.In the case, the hot spot of reflecting bundle departs from photodetector and imaging.
The lens displacement can produce following such problem in regenerate special-purpose CD or regeneration zone thus.
1) under original state, the output of each photodetector is little, can't carry out 2 values, and can not generate the phase differential tracking error signal can not control.
2) tracking Control is to carry out work on the position that has been shifted, therefore, can produce channel departs from, it is unstable that control becomes, the amplitude of RF (radio frequency) signal that comprises address signal, data-signal is low, the biasing of regenerated signal, shake deterioration, and meeting such as the increase of error rate generation also causes and can't regenerate.
As above illustrated, in follow-up control apparatus in the past, revise (with reference to Fig. 3) by means of the operation of the symmetry of the tracking error signal of accompaniment lens displacements only being carried out the phase adjusted amount and make and only become optimum condition.But this is modified to the state that has been shifted at lens following to symmetric correction.Therefore, above-mentioned 1), 2) problem cause the tracking Control instability, have the such problem of regenerability variation.
Also have, in record regenerating zone or CD-R, carry out the lens displacement from the original state shown in Fig. 8 (a) at the regeneration reserved area and revise, but when moving to posting field, become the state shown in Fig. 8 (b), the center of lens is consistent with the center of photodetector.But, the symmetry variation of recommending offset signal in record regenerating zone, channel center and beam center stagger, and promptly produce and depart from, and it is unstable that tracking Control becomes.Also have,, be recorded in the read rate variation of the borderline address signal of the shake deterioration of the information signal on the channel, the ridge that is written in channel and slot part, bring obstacle for stable signal regeneration along with this road departs from.
Summary of the invention
Even if an object of the present invention is to provide produce the optical axis that is caused by initial thing lens displacement fall through (optical axis deviation) also can carry out the optical disc apparatus of the high tracking Control of reliability.
Another object of the present invention is to provide the optical disc apparatus that carries out the high tracking Control of reliability under the situation of staggering on the posting field because of channel center and beam spot center on the lens that displacement the caused displacement correction back CD of initial thing lens but (producing the road departs from).
In the 1st optical disc apparatus that the present invention is correlated with, optical head possesses handlebar and faces toward the lens that information carrier focuses on by the light beam that light source produces; Moving part makes optical head move towards vertical with channel on the information carrier in fact direction; Photodetector has the test section that is divided into a plurality of zones and divide the reflected light that detects from the information carrier of light beam on a plurality of zone; Phase difference detection portion detects the phase differential of signal detected on a plurality of zones of photodetector; The phase differential channel departs from test section the position that is changed to by the detected phase difference variable of phase difference detection portion with light beam and interchannel is concerned corresponding signal; The output signal that the phase differential tracking control section departs from test section according to the phase differential channel drives moving part and control bundle scanning channel correctly.Also have, the lens displaced portions be added in offset signal on the moving part and the lens that make above-mentioned optical head towards vertical with the channel in fact only mobile ormal weight of direction, lens displacement correction portion is set in the said lens displaced portions to the flip-flop that appears on the output signal that the phase differential channel departs from test section for minimum offset signal.
In this optical disc apparatus, possessing such as phase difference detection portion has the phase adjusted of control phase difference portion, lens displacements correction portion makes phase adjusted portion be changed ormal weight and detected phase differential in phase difference detection portion by desired value, depart from the conversion of test section institute at the phase differential channel signal on the flip-flop that occurs be set in the lens displaced portions for the offset signal of minimum.
Phase difference detection portion preferably possesses the phase adjusted of control phase difference portion is arranged, lens displacement correction portion is obtained the 1st function and the expression phase adjusted portion lens displaced portions under the 2nd the setting value amount of movement that is caused and the 2nd function that departs from the relation of the flip-flop that occurs on the output signal of test section at channel of the lens displaced portions of expression phase adjusted portion under the 1st setting value amount of movement that is caused and the relation that departs from the flip-flop that occurs on the output signal of test section at channel, intersection point according to the 1st and the 2nd function is obtained offset signal, and the flip-flop of determining on the output signal that present channel departs from test section is minimum offset signal.
This optical disc apparatus preferably also possesses has channel to depart from the biasing correction portion, obtaining after the offset signal of lens displaced portions by means of lens displacement correction portion, revise flip-flop, the output signal that makes the phase differential channel depart from test section becomes symmetrical for reference potential.
But the 2nd optical disc apparatus related to the present invention is a kind of regeneration reserved area with the embossing that has write down information in advance and the optical disc apparatus that is used for information carrier in 2 kinds of zones that is formed and undertaken by mark the posting field of information record by pilot channel on channel.In this optical disc apparatus, optical head possesses the lens that light beam that handlebar produces by light source focuses on facing to information carrier, and moving part makes above-mentioned optical head move towards vertical with channel on the information carrier in fact direction.Photodetector has the test section that is divided into a plurality of zones and divide the reflected light that detects from the information carrier of light beam on a plurality of zone, phase difference detection portion detects the phase differential of each signal on the zoning of above-mentioned photodetector, and the 1st channel departs from test section according to concerning corresponding signal by the light beam on the regeneration reserved area of detected phase differential generation of above-mentioned phase difference detection portion and information carrier and the position of interchannel.Also have, push-pull-detection portion detects the intensity of the light beam of diffraction on channel, and test section generates light beam on the posting field with information carrier according to the detection signal of above-mentioned push-pull-detection portion and the position of interchannel concerns corresponding signal but the 2nd channel departs from.Also have, the output signal that the phase differential tracking control section departs from test section according to above-mentioned the 1st channel drives above-mentioned moving part and the control bundle channel on the scan information carrier correctly.Also have, recommend output signal that tracking control section departs from test section according to above-mentioned the 2nd channel and drive above-mentioned moving part and the control bundle channel on the scan information carrier correctly.The lens displaced portions is added in offset signal on the above-mentioned moving part and above-mentioned optical head is moved towards vertical with channel on the information carrier in fact direction, and lens displacement correction portion makes light beam be positioned on the regeneration reserved area of information carrier when device starts earlier and the flip-flop that appears on the output signal that above-mentioned the 1st channel departs from test section is set in the said lens displaced portions for minimum offset signal.
In this optical disc apparatus, possessing such as phase difference detection portion has the phase adjusted of control phase difference portion, lens displacement correction portion makes phase adjusted portion be changed ormal weight and detected phase differential in phase difference detection portion by desired value, is set in the lens displaced portions depart from the flip-flop that occurs on the detection signal of test section at the 1st channel for minimum offset signal.
Phase difference detection portion preferably possesses the phase adjusted of control phase difference portion is arranged, lens displacement correction portion is obtained the 1st function and the expression phase adjusted portion lens displaced portions under the 2nd the setting value amount of movement that is caused and the 2nd function that departs from the relation of the flip-flop that occurs on the detection signal of test section at the 1st channel of the lens displaced portions of expression phase adjusted portion under the 1st setting value amount of movement that is caused and the relation that departs from the flip-flop that occurs on the detection signal of test section at the 1st channel, intersection point according to the 1st and the 2nd function is obtained offset signal, and the flip-flop of determining on the detection signal that present the 1st channel departs from test section is minimum offset signal.
In this optical disc apparatus, preferably also possessing has channel to depart from the biasing correction portion, when optical disc apparatus starts, light beam is moved on the regeneration reserved area of information carrier, after lens displacement correction portion has been set offset signal, light beam is moved on the write down usefulness zone of information carrier, revise the flip-flop that the 2nd channel departs from test section.
In the 3rd optical disc apparatus related to the present invention, optical head possesses the lens that light beam that handlebar produces by light source focuses on facing to information carrier, and moving part makes above-mentioned optical head move towards vertical with channel on the information carrier in fact direction.3 bundle generating units are divided into the secondary bundle of leading secondary bundle and main beam and hysteresis to above-mentioned light beam, 3 bundle channels depart from test section and concern corresponding signal according to the position that the output difference of the leading secondary bundle of being divided by above-mentioned 3 bundle generating units and the secondary bundle that lags behind generates with above-mentioned main beam and interchannel, and the output signal that 3 bundle tracking control section depart from test section according to above-mentioned 3 bundle channels drives above-mentioned moving part and control bundle scanning channel correctly.Also have, the lens displaced portions be added in offset signal on the above-mentioned moving part and the lens that make above-mentioned optical head towards vertical with above-mentioned channel in fact direction mobile ormal weight only, lens displacement correction portion above-mentioned 3 bundle channels are departed from test section conversion the amplitude of the signal offset signal that becomes maximum be set in the said lens displaced portions.
This optical disc apparatus, preferably also possessing has channel to depart from the biasing correction portion, after having set the offset signal of lens displaced portions by means of lens displacements correction portion, revise remaining biasing, make 3 bundle channels depart from test section conversion signal for the reference potential symmetry that becomes.
The 4th optical disc apparatus related to the present invention is a kind of regeneration reserved area with the embossing that has write down information in advance and by concavo-convex Address Part with but pilot channel forms and carry out the optical disc apparatus that is used for information carrier of 2 kinds of information areas of the posting field of information record on above-mentioned pilot channel.In this optical disc apparatus, optical head possesses the lens that light beam that handlebar produces by light source focuses on facing to information carrier, and moving part makes above-mentioned optical head move towards vertical with channel on the information carrier in fact direction.Photodetector has the test section that is divided into a plurality of zones and divide the reflected light that detects from the information carrier of light beam on a plurality of zone, phase difference detection portion detects the phase differential of each signal on the zoning of above-mentioned photodetector, and the 1st channel departs from test section according to concerning corresponding signal by the light beam on the regeneration reserved area of detected phase differential generation of above-mentioned phase difference detection portion and information carrier and the position of interchannel.Also have, push-pull-detection portion detects the intensity of the light beam of diffraction on the channel of light beam, and test section generates light beam on the posting field with information carrier according to the signal of above-mentioned push-pull-detection portion and the position of interchannel concerns corresponding signal but the 2nd channel departs from.The output signal that the phase differential tracking control section departs from test section according to above-mentioned the 1st channel drives above-mentioned moving part and control bundle scanning channel correctly.Also have, recommend output signal that tracking control section departs from test section according to above-mentioned the 2nd channel and drive above-mentioned moving part and control bundle scanning channel correctly.But reproducing unit is by means of the Address Part and the information of regenerative recording on the posting field of information carrier of the signal regeneration information carrier of above-mentioned photodetector.The lens displaced portions is added in offset signal on the above-mentioned moving part and the lens of above-mentioned optical head is moved towards vertical with above-mentioned channel in fact direction.The biasing correction portion is applied to offset signal recommends on the tracking control section.Lens displacements correction portion is set in the said lens displaced portions to the flip-flop that appears on the signal that above-mentioned the 1st channel departs from test section for minimum offset signal.Characteristics Detection portion initial lens displacement according to the Characteristics Detection of the regenerated signal of being regenerated by reproducing unit, and lens displacement adjusting portion is regulated detected initial lens displacement by Characteristics Detection portion makes the characteristic of regenerated signal become the best.
In this optical disc apparatus, such as being the composition that rocks based on the regenerated signal of the information of reproducing unit by the detected characteristic of Characteristics Detection portion, lens displacement adjusting portion has applied the biasing back in said lens displacement correction portion and has regulated above-mentioned biasing correction portion and make that rocking composition becomes minimum.
In this optical disc apparatus, such as by the error rate of the detected characteristic of Characteristics Detection portion for the regenerated signal of the information of being regenerated by information regeneration portion, said lens displacement adjusting portion has applied the biasing back in said lens displacement correction portion and has regulated the above-mentioned balance portion that recommends and makes error rate become minimum.
In this optical disc apparatus, such as by the detected characteristic of Characteristics Detection portion be reproducing unit regeneration address signal rock composition, said lens displacement adjusting portion has applied the biasing back in said lens displacement correction portion and has regulated above-mentioned push-pull-detection portion and make that rocking composition becomes minimum.
In this optical disc apparatus, such as the error rate that by the detected characteristic of Characteristics Detection portion is the address reproducing unit address signal of being regenerated, said lens displacement adjusting portion has applied the biasing back in said lens displacement correction portion and has regulated the above-mentioned balance portion that recommends and makes the error in address rate become minimum.
In this optical disc apparatus, lens displacement adjusting portion preferably possesses the balance portion that recommends that has operation the 2nd channel to depart from the gain balance of test section and apply biasing.
In this optical disc apparatus, when being preferably in the optical disc apparatus startup light beam is moved on the regeneration reserved area of information carrier, after scioptics displacement correction portion had detected the offset signal of lens displaced portions, went up and startup lens displacement adjusting portion in the write down usefulness zone that light beam is moved to information carrier.
In this optical disc apparatus, the offset signal that lens displacement correction portion sets preferably defines within the limits prescribed.
In this optical disc apparatus, the symmetry that the offset signal that lens displacements correction portion sets preferably defines the 2nd road offset signal on the write down usefulness zone that becomes to make information carrier within the limits prescribed.
In the 5th optical disc apparatus related to the present invention, optical head possesses the lens that light beam that handlebar produces by light source focuses on facing to information carrier, and moving part makes above-mentioned optical head move towards vertical with channel on the information carrier in fact direction.Photodetector has the test section that is divided into a plurality of zones and divide the reflected light that detects from the information carrier of light beam on a plurality of zone, channel depart from test section the output transform of above-mentioned photodetector for concerning corresponding road offset signal with the position of light beam and interchannel, the output signal that the channel tracking control part departs from test section according to above-mentioned channel drives above-mentioned moving part and control bundle scanning channel correctly.The lens displaced portions is added in offset signal on the above-mentioned moving part and makes above-mentioned optical head towards vertical with above-mentioned channel in fact direction mobile ormal weight only.Characteristics Detection portion detects the characteristic of the regenerated signal of being regenerated by reproducing unit, and lens displacement adjusting portion is set on the said lens displaced portions according to by the detected characteristic of Characteristics Detection portion the regenerated signal characteristic being become best offset signal.
In this optical disc apparatus, such as the inspection of above-mentioned Characteristics Detection portion by to above-mentioned photodetector and signal carry out the waveform equivalence the regenerated signal handling part and output signal 2 values of above-mentioned regenerated signal handling part and detect and synchronous regeneration time clock between the test section that rocks that rocks forms, the said lens offset signal that the adjusting portion handle rocks to minimum that is shifted is set on the said lens displaced portions.
In this optical disc apparatus, detect above-mentioned photodetector and amplitude signal such as above-mentioned Characteristics Detection portion, said lens displacement adjusting portion handle and signal amplitude are set on the said lens displaced portions for maximum offset signal.
In this optical disc apparatus, such as the inspection of above-mentioned Characteristics Detection portion by to above-mentioned photodetector carry out the regenerated signal handling part of waveform equivalence with signal, 2 value portions of output signal 2 values of above-mentioned regenerated signal handling part, the synchronous phase-locked portion of signal and regeneration time clock that makes above-mentioned 2 value portions, decipher and carry out the error correction portion of error correction and error count portion that the mistake that produces when the error correction that is caused by above-mentioned error correction portion is detected and counts forms by above-mentioned phase-locked output signal to the 2 value portions relevant with phase-locking.Said lens displacement adjusting portion becomes minimum or wrong number to the wrong number of being counted by above-mentioned error count portion and becomes minimum scope and become maximum offset signal and be set on the said lens displaced portions.
This optical disc apparatus, preferably also possessing has the biasing correction portion, after having set the offset signal of lens displaced portions by means of lens displacement correction portion, revises the biasing of the remainder of road offset signal.
Description of drawings
Fig. 1 is the mode chart that is used to illustrate the detection principle that the phase differential of conventional art is followed the tracks of.
Fig. 2 is used to illustrate that biasing that the phase differential of conventional art is followed the tracks of produces the mode chart of principle.
Fig. 3 is the block scheme of the formation of the detection of the phase differential tracking of expression conventional art and the correction circuit of setovering thereof.
Fig. 4 is the performance plot of expression for the symmetric variation of TE that biasing produced of the phase differential tracking of the lens displacement of conventional art.
Fig. 5 is the circuit diagram that is used to illustrate 3 bundle tracking detection modes in the past.
Fig. 6 follows the tracks of the mode chart of the position relation of the light beam of detection modes and channel for expression is used to illustrate in the past 3 bundles.
The lens center that Fig. 7 solves problem of the present invention for expression is used to illustrate and the mode chart of the relation of the position between the photodetector center.
The lens center that Fig. 8 solves problem of the present invention for expression is used to illustrate and the mode chart of the relation of the position between photodetector center and the channel center.
Fig. 9 is the block scheme of expression based on the formation of the optical disc apparatus of embodiments of the invention 1.
Figure 10 is the oscillogram that is used to illustrate the phase differential tracking error signal of embodiments of the invention 1.
Figure 11 is the performance plot of each variation of handling of the characteristic of lens displacement in the tracking and controlling method on the expression embodiments of the invention 1 and phase differential TE biasing.
Figure 12 is the process flow diagram of the tracking and controlling method on the embodiments of the invention 1.
Figure 13 is the performance plot that lens are shifted and phase differential TE setovers on the embodiments of the invention 1.
Figure 14 is the oscillogram that is used to illustrate the phase differential tracking error signal of embodiments of the invention 1.
Figure 15 is the performance plot that lens are shifted and phase differential TE setovers on the embodiments of the invention 1.
Figure 16 is the oscillogram that is used to illustrate the phase differential tracking error signal of embodiments of the invention 1.
Figure 17 is the performance plot that lens are shifted and phase differential TE setovers on the embodiments of the invention 1.
Figure 18 is the oscillogram that is used to illustrate the phase differential tracking error signal of embodiments of the invention 1.
Figure 19 is the performance plot that lens are shifted and phase differential TE setovers on the embodiments of the invention 1.
Figure 20 is used to illustrate the lens displacement of other tracking and controlling method of embodiments of the invention 1 and the performance plot that phase differential TE setovers.
Figure 21 is the process flow diagram of the tracking and controlling method on the embodiments of the invention 1.
Figure 22 is the block scheme of expression based on the formation of the optical disc apparatus of embodiments of the invention 2.
Figure 23 is the mode chart of the CD used on embodiments of the invention 2.
Figure 24 is the oscillogram that is used to illustrate the push-pull tracking error signal of embodiments of the invention 2.
Figure 25 is the process flow diagram of the tracking Control of embodiments of the invention 2.
Figure 26 is the block scheme of expression based on the formation of the optical disc apparatus of embodiments of the invention 3.
Figure 27 is 3 oscillograms of restrainting tracking error signals that are used to illustrate embodiments of the invention 3.
Figure 28 is amplitude, the symmetric performance plot for 3 bundle tracking error signals of lens displacement that is used to illustrate embodiments of the invention 3.
Figure 29 is that other that be used to illustrate embodiments of the invention 3 constitutes, amplitude, the symmetric performance plot for the push-pull tracking error signal of lens displacement of effect.
Figure 30 is the process flow diagram of the tracking Control of embodiments of the invention 3.
Figure 31 is the block scheme of expression based on the formation of the optical disc apparatus of embodiments of the invention 4.
Figure 32 is the block scheme of the formation of signal processing circuit part in the optical disc apparatus on the expression embodiments of the invention 1.
Figure 33 is the performance plot for the dither signal of lens displacement that is used to illustrate embodiments of the invention 4.
Figure 34 is the amplitude characteristic figure for the RF signal of lens displacement that is used to illustrate embodiments of the invention 4.
Figure 35 is the performance plot for the margin of error of lens displacement that is used to illustrate embodiments of the invention 4.
Figure 36 is the process flow diagram of the tracking Control of embodiments of the invention 4.
Figure 37 is the block scheme of the formation of expression embodiments of the invention 5.
Figure 38 is the performance plot for the dither signal of lens displacement that is used to illustrate embodiments of the invention 5.
Figure 39 is the amplitude characteristic figure for the RF signal of lens displacement that is used to illustrate embodiments of the invention 5.
Figure 40 is the performance plot for the margin of error of lens displacement that is used to illustrate embodiments of the invention 5.
Among the figure, 101: CD, 102: motor, 103: tracking regulator, 104: focusing regulator, 105: condenser lens, 106: the polarizing hologram element, 107: beam spot, 108: laser, 114: the subregion photodetector, 115: prime amplifier, 116: matrix operation device, 117: phase regulator, 118: comparer, 119: the phase differential balancing circuitry, 120: phase comparator, 123: phase regulator, 124: comparer, 125: tangential phase comparator, 132: digital signal processor, 133: hybrid circuit, 134: driving circuit, 135: driving circuit, 136: driving circuit, 137: horizontal motor, 150: recommend balancing circuitry, 151: differential amplifier, 152: low-pass filter, 160:2 subregion photodetector, 161: prime amplifier, 170: analog signal processing circuit, 181: envelope detection circuit, 1700: error counter, 1701:AGC, 1702: the waveform equivalent circuit, 1703:2 value circuit, 1704:PLL circuit, 1705: code translator ECC (error correction code) circuit.
Embodiment
With reference to the accompanying drawings embodiments of the invention are described.Also have, in the accompanying drawings, identical reference marks is represented same or equivalence.
Embodiment 1
Fig. 9 represents the formation of the optical disc apparatus (optical recording/reproducing apparatus) on the embodiment 1.In this optical disc apparatus, (optical axis deviation) also can detect the signal suitable with this amount of movement and be proofreaied and correct even if the optical axis that generation is caused by initial thing lens displacement falls through, making the lens displacement is 0, even the thing lens normally are positioned at the center, become the state shown in Fig. 7 (a), obtain good tracking signal and RF signal, carry out the high tracking Control of reliability.
At first, elemental motion is described.In Fig. 9, as the CD 101 of information carrier by the rotating speed rotation of CD motor 102 with regulation.Digital signal processor (DSP) 132 outputs to horizontal motor 137 to horizontal drive signal TRSD by driving circuit 136, makes optical head moving radially and moving toward the channel that configures along CD 101.Be used for the optical system that beam spot 107 shines on the CD 101 is made up of light source 108, coupled lens 109, polarized beam splitting device 110, polarizing hologram element 106 and the condenser lens 105 of semiconductor laser etc.The light beam 140 that is sent by light source 108 becomes directional light by coupled lens 109, then, this directional light is after being reflected on the polarized beam splitting device 110, again by polarizing hologram element 106, focus on by condenser lens 105, beam spot 107 is formed on the information track of CD 101.By condenser lens 105, polarizing hologram element 106, polarized beam splitting device 110, incide photodetector 114 by collector lens 113 from the reflected light of the beam spot 107 of CD 101 again.Photodetector 114 possesses 4 zones detecting incident light, and the output of these 4 test section A～D is imported into prime amplifier 115a～115d respectively, and electric current is converted into voltage, is imported into matrix operation device 116 then.The various combinations of the test section A～D of 116 pairs of photodetectors 114 of matrix operation device are carried out and computing, illustrated as the back, generate phase differential tracking error signal (hereinafter referred to as phase signal TE), tangential phase signal (hereinafter referred to as the TG signal) and focus error signal (not shown) according to this computing.
Secondly, generation and the tracking Control to phase differential tracking error signal (TE) describes.Be output to phase regulator 117a, 117b as the A+C of the diagonal sum of the surveyed area A～D of photodetector 114 and the sum signal of B+D by means of matrix operation device 116.Phase regulator 117a, 117b for example regulate the biasing that the phase differential because of the irregular tangential direction that produces of the groove line degree of depth causes by the retardation/leading amount that changes wave filter.Phase regulator 117a, 117b can be in the time-axis direction inhibit signals by means of the conditioning signal GBAL that exports from DSP132.From the signal of phase regulator 117a, 117b output respectively by means of comparer 118a, 118b by 2 values and be converted into pulse signal, the phase differential balancing circuitry 119 through the biasing of correction circuit etc. is imported into phase comparator 120 again.The pulse signal that phase comparator 120 is relatively imported, the road that detects with beam spot 107 departs from corresponding phase differential, and the phase differential that is detected is by LPF (low-pass filter) 121 smoothedization and generate phase differential TE.Phase differential TE is transformed by AD transducer 122 then, is imported into DSP132 as phTE.DSP132 carries out the wave filter computing of carrying out phase compensation and low pass compensation to the phase differential TE that is imported, by built-in DA transducer output drive signal TRD.Drive signal TRD is imported into driving circuit 134 by hybrid circuit 133, is amplified by electric current by means of driving circuit 134, makes electric current flow to tracer element 103.Thus condenser lens 105 is driven on the tracking direction.Like this, carry out tracking Control and make light beam scanning channel correctly on the CD 107.(as the back was illustrated, this driving circuit 134 also was used in the time will driving the displacement of bias LSD control lens according to the tracking that is input to hybrid circuit 133.)
Generation to tangential phase signal (TG signal) describes below.Matrix operation device 116 outputs to the sum signals at A+B that is divided on the tangential direction and C+D on phase-adjusted phase regulator 123a, the 123b that carries out with the phase regulator 117a that regulates the biasing that is produced by the phase differential in the tangential direction on the phase differential TE, 117b interlock, by 2 values and be converted into pulse signal, tangential phase comparator 125 detects the phase differential of each pulse signal that is transformed by comparer 124a, 124b in the output of phase regulator 123a, 123b.Phase regulator 123a, 123b are the same with phase regulator 117a, 117b can be leading by means of the hysteresis of the GBAL Signal Regulation phase place of exporting from DSP132.By tangential phase comparator 125 detected tangential phase differential by LPF (low-pass filter) 126 smoothedization and generate tangential phase signal TG.This TG signal is imported into DSP132 by AD transducer 127.DSP132 can detect the amount of phase difference of tangential direction by means of the TG signal, and control phase regulator 123a, 123b and 117a, 117b make this TG signal become 0.Can eliminate the phase differential and the thing followed biasing of tangential direction thus.
Also have, in focus control, the difference of the signal of diagonal sum A+C, B+D by obtaining 4 subregion photodetectors 114 generates and is input to DSP132 based on the focus error signal of astigmatism method and this focus error signal.Focus error signal is output as drive signal FOD through the wave filter computing, is amplified by electric current and drives focusing regulator 104 by means of driving circuit 135.Realize focus control thus.But this focus control system and the present invention do not have direct relation, therefore, omit diagram and explanation.
When starting, when making focus control work under original state (tracking Control is not worked), phase differential TE signal such shown in Figure 10 (b) is output from phase comparator 120 by LPF121.Even if be under zero the situation in lens displacements, symmetry also can be because of irregular etc. the circuit bias of the circuit gain of initial photodetector and prime amplifier variation (situation of Figure 10 (b) is for producing the situation that 50% symmetry departs from because of biasing) like that shown in Figure 10 (b).Also have, the shape of the light beam on the 4 subregion photodetectors 114 particularly produces the phase differential of radially dividing the tangential direction that obtains along CD 101 because of irregular (particularly the groove line degree of depth is irregular) of the information track line on the CD produces imbalance.Thus, when making lens be shifted positive and negative 300 μ m like that respectively as Figure 10 (a) or (c), the biasing of phase differential TE produces, and symmetry is compared with the state that does not have the lens displacement and departed from.Also have, setting under the vertical situation, when the initial lens displacement composition that is produced when the sagging or optical axis deviation of lens etc. exists, bring offset change to become uneven thus for the displacement of the lens of phase differential TE, these are applied and the serious variation of symmetry, in the case,, the importing of tracking or enter, the control of saltus step etc. becomes unstable.
In the tracking and controlling method of present embodiment, from the essential factor of the symmetry variation that makes such phase differential tracking error (TE) (this difference with the diagonal sum A+C of 4 subregion photodetectors 114 and B+D is relevant), separate the biasing that causes because of circuit is irregular with by the lens displacement that distinctive tangential phase differential in the phase differential tracking error causes, extract the go forward side by side line trace control of its initial lens shift amount out, be adjusted to best tracing positional.Thus, even if initial lens displacement is arranged, also can guarantee best regenerated signal and lens displacement tolerable limit.Figure 11 is illustrated in the lens displacement in this a series of tracking Control action and the symmetric relationship change of phase differential tracking error (TE).Figure 12 represents the process flow diagram that this tracking Control is handled.Tracking Control is to be carried out through 4 states shown in Figure 11.These 4 states be original state 1., state that conditioning signal GBAL optimally is adjusted to TG=0 2., further regulate PHTBAL make state that symmetry matches 3., the state that deliberately GBAL postponed behind the ormal weight to seek the lens displacement by the point that detects symmetry 0 4..Why 1. original state the state of not regulating yet, and (GBAL=0 PHTBAL=0), under this state, supposes to exist tangential phase differential TG=a.Next state 2. in, DSP132 for phase regulating circuit 123a, 123b optimally adjustment signal GBAL make TG=0 (S5～S6).Under this state, the biasing that causes because of circuit is irregular is separated, even if the lens displacement is arranged, phase differential tracking error (TE) also can keep certain asymmetry.Next state 3. in, DSP132 obtains remaining biasing, for this is revised, phase differential balancing circuitry 119 is regulated PHTBAL, and symmetry is matched, the positive and negative amplitude of phase differential (TE) is equated (S7～S8).Under this state, for the characteristic basically identical of the phase differential TE of lens displacements on X-axis.Next state 4. in, deliberately GBAL is postponed ormal weight, seek lens shift signal LSD (S9～S12) by the point that detects symmetry 0.The lens shift amount is revised as following the tracks of driving biasing LSD setting by the tracing positional that handle is suitable with the correction of lens displacement, then, GBAL is reverted to initial value (S13).Thus, the symmetry for the phase differential TE of lens displacements overlaps with X-axis basically.And, be that target is carried out tracking Control with the tracing positional of the best, even if there is the lens displacement also can not increased the phase differential TE of the symmetry of biasing.
With Fig. 9 and Figure 10～Figure 19 the tracking and controlling method that the lens on the embodiments of the invention 1 are shifted is elaborated below.
At first, describe with Figure 10 and Figure 13, when device during energized, spindle drive motor 102 is driven, and (LD) 108 is luminous for light source, carries out the focus control (S1 among Figure 12～S4) with the focus state control bundle spot of regulation on CD 101.As mentioned above, shown in Figure 10 (b), even if there is not the lens displacement, the output of the phase differential TE that is generated under this state becomes asymmetric for reference potential because of biasing, and then makes offset change because of lens are shifted.Figure 13 is the performance plot of the symmetric relation of this lens shift amount of expression and phase differential TE.Why this original state the state of not regulating yet is the state of GBAL=0 and TG=a, is the represented position of 2B point.When lens displacements produced ,-300 μ m were at the 2A of Figure 13 point place, asymmetry be 90% ,+300 μ m at the 2C of Figure 13 point place, asymmetry is-20%.Know that experimentally lens are shifted therewith that the pass of asymmetry is the 1. such linear relationship of straight line.Figure 10 (a), (c) be illustrated in lens and be shifted ± the 2A point of 300 μ m, the phase differential TE at 2C point place and the waveform of TG signal.
But as shown in Figure 9, this phase differential TE is taken into DSP132 by AD transducer 122, can go out this asymmetry as bias detection.Also have, the tangential phase signal (TG signal) that is generated by tangential phase comparator 125 and LPF126 produces with the DC signal as shown in Figure 10, is taken into DSP132 by AD transducer 127 equally, can detect tangential amount of phase difference.
DSP132 is taken into above-mentioned TG signal by AD transducer 127, and tangential balanced signal GBAL is outputed to phase regulator 117a, 117b and 123a, 123b, seeks the output valve that above-mentioned TG is almost 0 GBAL, sets GBAL=a.Figure 14 is for representing the phase differential TE signal at this moment and the oscillogram of TG signal, and Figure 15 is the performance plot of expression for the symmetry variation of the phase differential TE of lens displacement.As Figure 14 and shown in Figure 15, when GBAL is conditioned and during the almost nil level of TG signal, even if the lens displacement is arranged, phase differential TE also can keep certain 20% asymmetry.Therefore, in asymmetry, lens have been shifted ± and the 4A point of 300 μ m and 4C point be almost with the 4B point of lens displacement 0 and come on the straight line of constant (S5, S6).
Then, the amplitude of the peak/paddy by detecting phase differential TE or calculate the resulting positive and negative area of integrated waveform and obtain remaining 20% biasing.DSP132 outputs to phase differential balancing circuitry 119 to balance corrected signal PHGBAL value, revises the biasing of being tried to achieve.As shown in figure 16, can generate the phase differential TE (S7, S8) that positive and negative amplitude equates by calculating, set the amplitude that makes the phase differential TE that on above-mentioned sawtooth wave, exports for the output of the PHGBAL of reference potential symmetry.Under this state, GBAL also is adjusted to a, therefore, as shown in figure 17, for the characteristic basically identical of the phase differential TE of lens displacements on X-axis.
Then, DSP132 manages tangential balanced signal is changed over ormal weight GBAL=b (S9).Thus, have again as the 3. such characteristic of linear change of the straight line of Figure 19 for the symmetry of lens displacements, and, the sensitivity of the phase differential TE that is shifted for lens can suitably be regulated.At this moment, shown in Figure 18 (a), the optical axis that phase differential TE is caused because of the assembly error of optical system etc. again falls through or the sagging initial lens displacement that produces of the condenser lens when vertically being provided with causes biasing (asymmetry) Q to produce.As mentioned above, the symmetry (amount of bias) of lens displacement and phase differential TE has linear characteristic, therefore, can easily detect the tracking driving biasing LSD that the phase differential TE that sends as an envoy to becomes symmetry (being biased to 0).
Thus, the amplitude of=0 o'clock phase differential TE of lens displacement becomes positive and negative like that and equates shown in Figure 18 (b), therefore, by revising (S10, S11, S12) to the suitable tracing positional of the correction of lens displacement therewith to the lens shift amount as following the tracks of driving biasing LSD setting, after the correction output of lens displacement, GBAL is reverted to initial value (S13), overlap with X-axis basically for the symmetry of the phase differential TE of lens displacements.Resulting phase differential TE is symmetrical, is that target is carried out tracking Control with the tracing positional of the best, and, even if lens displacement also not increasing biasing is arranged.Even have initial optical axis to fall through or the vertical sagging lens displacement that causes also can be guaranteed best regenerated signal and lens displacement tolerable limit thereof.
In the above-described embodiments, initial correction GBAL furnishing the best of revising tangential phase differential TG.But, even do not obtaining the lens displacement correction (follow the tracks of and drive bias LSD) that best GBAL also can obtain the best at first.Below, embodiment describes to this conversion.As shown in figure 20, why original state the state of not regulating (GBAL=0, PHTBAL=0) yet, under this state, supposes to exist tangential phase differential TG=a.At first, secondly initial tangential phase differential correction GBAL=0 is with the biasing characteristic of approximation of function phase differential tracking error (TE),, stagger GBAL=d behind the ormal weight of tangential phase differential correction, with the biasing characteristic of approximation of function phase differential tracking error (TE).Then, obtain i.e. tracking driving bias LSD on the P point that equates of the biasing Dp of 2 functions at its intersection point P.Method high precision and obtain the correction LSD of best lens displacement more quickly more thus.
Figure 21 represents the process flow diagram of this tracking and controlling method.(the step S1～S4 in the process flow diagram of S101～S104) and Figure 12 is identical in action before carrying out focus control.Then, suppose tangential phase differential correction GBAL=0 (S105).Then, make the lens displacement increase by 1 step, instrumentation, storage are carried out in the biasing of phase differential TE.Lasting these steps before the sampling that reaches stated number (S105～S108).Then, with the characteristic (S109) of approximation of function GBAL=0.Then, suppose tangential phase differential correction GBAL=d (S110).Then, make the lens displacement increase by 1 step, instrumentation, storage are carried out in the biasing of phase differential TE.Lasting these steps before the sampling that reaches stated number (S111～S113).Then, with the characteristic (S114) of approximation of function GBAL=d.Then, obtain intersection point P and definite driving bias LSD (S115) that follows the tracks of of resulting 2 functions.
Embodiment 2
The figure that Figure 22 describes for the optical disc apparatus to the embodiments of the invention 2 that are used for CD-R (hereinafter referred to as RW dish) 101.This optical disc apparatus is for adding the device behind the circuit 150～153 that is used to recommend balance in the device of Fig. 9.The identical identical symbol of part mark of optical disc apparatus with the embodiment 1 of Fig. 9.In this optical disc apparatus, initial lens displacement is arranged, therefore, but departing from the posting field under the situation of (producing the road departs from) at channel center and beam spot center that the lens displacement is revised on the CD of back, depart from the road is 0 to be under the state that has been corrected of lens displacements, make beam spot be centered close to channel center's (state of Fig. 8 (c)) by carrying out tracking Control and adjusting, promptly 1) recommends offset signal and be symmetry for reference potential, 2) the shake minimum or the error of regenerated signal become minimum, 3) address signal of interchannel is the most readable, can move to control center on the good position of the characteristic of regenerated signal, provide reliability high device.
Below RW dish 101 is described.Shown in Figure 23 (a), the introducing portion of inner ring (the ROM zone: information regional A) is formed as embossing, the concavo-convex guiding groove channel that carries out the information record by means of phase transformation etc. in the user data portion in its outside (RW zone: be formed spiral fashion in the area B～C).With obtain light beam on this concavo-convex channel ± push-pull tracking error signal (recommending TE) of the difference of the reflection strength of 1 diffraction light carries out the tracking Control on CD 101.
Below the generation of recommending TE is described.The sum signal of A-D that is divided on tracking direction and B+C is output by matrix operation device 116.Should each output with beam spot on channel with concavo-convex guiding groove+light intensity of 1 light and-1 light is corresponding.Recommend balancing circuitry 150 and regulate symmetric balance by the gain of regulating each input signal.Then, differential amplifier 151 is recommended TE (PPTE) from both difference generations.Recommend balancing circuitry 150 and be conditioned by means of the signal PPTBAL from DSP132 output, the TE that recommends that has regulated balance is imported into DSP132 through LPF152 and AD transducer 153.DSP132 carries out the wave filter computing of carrying out phase compensation and low pass compensation to the TE that recommends that is imported, by built-in DA output drive signal TRD.The TRD that is output is imported into driving circuit 134 by hybrid circuit 133, is amplified by electric current by means of driving circuit 134, makes electric current flow to tracer element 103.Driving condenser lens 105 thus carries out tracking Control and makes the light beam on the CD 107 correctly scan concavo-convex channel.
Figure 25 represents the process flow diagram to the tracking Control of RW CD on the embodiment 2.When power connection (S201), spindle drive motor is driven (S202).Then, DSP132 outputs to horizontal motor 137 to horizontal drive signal TRSD by driving circuit 136, make condenser lens 105 grades move to inner ring and make light beam 107 be positioned at CD 101 inner ring embossing portion regional A (introducing portion) (S203).Then, the same with step S4～813 of Figure 11 of embodiment 1, to by the GBAL in embossing portion, PHTBAL and drive the displacement of the biasing lens that LSD caused and regulate (S206～S214).Thus, by push-pull tracking error (TE) being revised by driving the lens displacement that is caused of setovering.
Then, stop focus control (S215), give horizontal motor 137 drive signals to the outer ring, light beam 107 is positioned at by on the concavo-convex channel of the channel of the outside regulation of the A of embossing portion such as area B (8216) by driving circuit 136.Carry out focus control (S217) on this RW area B once more, such as shown in figure 24 recommending followed the tracks of offset signal (recommending TE) and is output from differential amplifier 125.The biasing PPOFS that recommends TE that this is output makes lens displacements be adjusted to the best in embossing portion, and therefore, the essential factor of biasing all is that the deviation by optical system and Circuits System causes.Therefore, calculating PPTE biasing back (S218), the ppTBAL value of correction being recommended balance from DSP132 is revised the biasing POFS (S219) that recommends TE toward recommending balancing circuitry 150 outputs.Carry out tracking Control then, keep action (flyback action), become the order waiting status on the enterprising trade of the channel of regulation.
Embodiment 3
Figure 26 represents the optical disc apparatus of inventive embodiment 3.Here, especially 3 restraint tracking error signals and describe as example with what on CD etc., uses.To enclosing identical symbol and omit its explanation with the same part of Fig. 9.In this device, realize the tracking detection of 3 bundles and the method for tracking Control and the displacement of lens in this case tracking Control thereof.
This optical disc apparatus uses by the surveyed area F of 2 subregions, the photodetector 160 that E forms.Light beam is diffracted into main beam 107M by means of polarizing hologram element 106 and is used for 3 bundles on CD 101 follows the tracks of pair bundle 107S1, the 107S2 that detects, and is separated to focus on.Reflected light from pair bundle 107S1,107S2 is irradiated onto respectively on the 2 subregion photodetectors 160.The signal of surveyed area F, E is carried out the current-voltage conversion by prime amplifier 161a, 161b respectively, and magnitude of voltage is imported into differential amplifier 163 by matrix operation circuit 116 via balance adjustment circuit 162.The output of differential amplifier 163 is that 3 bundle tracking error signals (TE3B) are output on the DSP132 via LPF164 and AD transducer 165 as the secondary light quantity difference signal of restrainting S1, S2.
Here, when beam center under original state during because of the center of lens displacements substantial deviation lens center and photodetector, the hot spot of reflecting bundle departs from photodetector and imaging.Therefore, the asymmetrical 3 bundle tracking errors (TE) of biasing that become as shown in Figure 27 generation.Also because of the lens displacement changes, its characteristic becomes the such characteristic of Figure 28 (a) and (b) for this 3 bundle its amplitude of TE and biasing.As shown in figure 28, the lens shift amount in the time of can becoming maximum by the amplitude of seeking and set 3 bundle TE is followed the tracks of driving bias 3BLSD and as the regulated value of the best biasing is revised.At this moment, be not under 0 the situation in the biasings of 3 bundle TE, remaining biasing 3BOFS is the biasing outside the lens displacement, therefore, can revise and obtains 3 good bundle TE by the 3BTBAL that revises this biasing is outputed to balance adjustment circuit 162 from DSP132.Searching at the lens shift amount of above-mentioned 3 bundle TE when becoming maximum is had various methods, for example has 1) some amplitude of instrumentation is with respect to the relation of lens displacement and this close method, 2 of obtaining the lens shift amount of this approximate function when maximum like the function that becomes regulation again) to the positive and negative mobile ormal weight of lens shift amount and obtain the method, 3 of the lens shift amount corresponding with the intermediate point that equates of amplitude on the point after moving) make the increase of lens shift amount or reduce ormal weight and obtain amplitude from the method for the limit that is increased to minimizing etc.Present embodiment is the peaked method of asking of tracking error amplitude, and is unrestricted.
Also have, the push-pull tracking error among the embodiment 2 (TE) also has characteristic much at one like that shown in Figure 29 (a) and (b), and therefore, embodiment 3 also can be adapted to regulate the method that TE makes it to become maximum of recommending on the RW dish among the embodiment 2.
Figure 30 represents the flow process of the tracking Control on the embodiment 3.(S1～S4), when the device energized, spindle drive motor 102 is driven, and (LD) 108 is luminous for light source, carries out the focus control (S301～S304) with the focus state control bundle spot of regulation on CD 101 with the flow process of Figure 12 of embodiment 1.Then, the driving biasing 3BLSD (S305) when searching 3 bundle TE become maximum sets its corresponding driving biasing 3BLSD (S306).Then, instrumentation 3 bundle biasings (S307) output to the 3BTBAL that obtains balance adjustment circuit 162 and regulate biasing (S308).
Embodiment 4
Figure 31 represents the formation based on the optical disc apparatus of embodiment 4.In Figure 31, to enclosing identical symbol and omit its explanation with the same part of the optical disc apparatus (Fig. 9) of embodiment 1.Tracking Control by by DSP132 to phase differential tracking error (TE) or recommend TE and carry out filtering operation and handle and to realize.Matrix operation portion 116 also outputs to output analog signal processing circuit 170 and envelope detection circuit 181 to the full plus signal of the A+B+C+D of 4 subregion photodetectors 114 as the RF signal.Analog signal processing circuit 170 is being recorded in signal on the CD 101 as information regeneration.
Figure 32 represents that the inside of analog signal processing circuit 170 constitutes.The waveform equivalent circuit 1702 that the RF signal that is transfused to amplitude on agc circuit 1701 becomes certain back frequency by emphasizing signal band is imported into partition data circuit 1703.Partition data circuit 1703 partition datas also are transformed into 2 value signals.2 value signals are imported into PLL circuit 1704, carry out frequency control and phase control to being used to extract the data synchronization clock out.Also have, 2 value signals are output to main frame 1709 by main frame I/F (interface) circuit 1706 as regenerating information again by means of code translator/ECC circuit 1705 decoded and error correctings.The phase error of the phase comparator of PLL circuit 1704 (not shown) is equivalent to rocking of data and clock, therefore, rocks testing circuit 1707 phase data is transformed into voltage, outputs to DSP132 by AD transducer 183 as rocking signal JIT again.DSP132 can detect this level that rocks signal.
Rock signal JIT and the actual proportional relation of rocking, hour level is low when rocking, when rocking level height when big.Figure 33 represents that this rocks the relation of signal JIT and lens displacement.Also have, waveform equivalent circuit 1702 can become its characteristic programmable.In Figure 33, solid line is the displacement of the lens under the characteristic that sets and the characteristic of rocking signal when actual signal regenerate, dotted line is in the characteristic that the lens under the situation about having set more on the low side for the degree of emphasizing of the signal band of waveform equivalent circuit 1702 are shifted and rock signal.Under the situation of the solid line of Figure 33, DSP132 can detect the flex point a, the b that rock signal and obtain best lens shift position by detecting this mid point c of 2.Also have, in order further to improve precision, deliberately the setting of converted-wave equivalent circuit 1702 makes its characteristic become the characteristic of dotted line, by means of approximation of function or obtain and rock 2 the mid point that signal amplitude equates and detect this minimal point P, set promptly to follow the tracks of and drive bias LSD with the corresponding lens displacement of this adjusting position correction.
Also have, the RF signal that is imported into analog signal processing circuit 170 also is imported into envelope detection circuit 181, and DSP132 can detect the amplitude of RF signal by AD transducer 182.It is such that lens displacements and RF amplitude are that relation that the RF envelope detection circuit is exported RFENV becomes Figure 34, become the lens shift position that maximum point detects the best by seeking RFENV with DSP132, the same with above-mentioned situation of rocking, set the lens displacement correction suitable and promptly follow the tracks of driving bias LSD with this lens shift position.
Also have, code translator/error correcting circuit 1705 is input to the wrong counting number circuit 1700 that the mistake (ERR) that is taken place is counted.Mistake counting number circuit 1700 is input to DSP132 to the number that makes a mistake.The relation of lens displacements and wrong number becomes as the characteristic of Figure 35, by obtain and set a that wrong number sharply begins to increase, the lens shift amount of mid point c of lens shift amount on the b is promptly followed the tracks of and is driven the lens shift position that bias LSD can be adjusted to the best.The same with embodiment 2,3, after rocking JIT, envelope RFENV or wrong number ERR with these lens displacements regulated, the biasing of the remainder of instrumentation phase differential TE and from DSP132 output corrected signal to the phase differential balancing circuitry.Obtain good phase differential tracking signal thus.
The process flow diagram of the tracking Control of the 3 class lens displacement on Figure 36 (a) and (b), (c) expression embodiment 4.Also have, though here phase differential tracking error (TE) is described, for recommend TE or 3 bundle TE carry out the situation of tracking Control also can be suitable equally.
In the flow process of Figure 36 (a), when device during energized, spindle drive motor 102 is driven, the 108 luminous (S401～S403) of light source (LD).Then, on CD 101, carry out focus control, make tracking Control work (S404), seek and rock the tracking driving biasing (S405A) of JIT, this is set follow the tracks of the LSD (S406) that setovers for minimum with the focus state control bundle spot of regulation.Then, stop tracking Control (S407), instrumentation phase differential TE setover (S408).Then, set PHGBAL (S409), start tracking Control (S410).
Compare with (a), the flow process of Figure 36 (b) and (c) is just different on the content of step S405A.In (b), seek the RF amplitude, i.e. RF envelope detection circuit output RFEMV is almost maximum tracking and drives biasing (S405B), and in (c), the location of mistakes is counted ERR and is almost minimum and tolerable limit drives biasing (S405C) for maximum tracking.
Embodiment 5
Figure 37 represents the formation based on the optical disc apparatus of embodiments of the invention 5.In Figure 37, to enclosing identical symbol and omit its explanation with the same part of Figure 22 of formation of the optical disc apparatus of the Figure 31 of the formation of the optical disc apparatus of expression embodiment 4 and expression embodiment 2.Also have, in Figure 37, signal processing circuit 170 is the same with content shown in Figure 32.
When power connection, DSP132 outputs to horizontal motor 137 to horizontal drive signal TRSD by driving circuit 136, makes condenser lens 105 grades move to inner ring and makes light beam 107 be positioned at the regional A (introducing portion) of the inner ring embossing portion of CD 101.Then, the same with embodiment 1,2, to regulating by the GBAL in embossing portion, PHTBAL and the displacement of the driving biasing lens that LSD caused, setting thus the best lens of phase differential tracking error (TE) are shifted.Then, stop focus control once more, give horizontal motor 137 drive signals to the outer ring, light beam 107 is positioned on the concavo-convex channel by the channel of the outside regulation of the A of embossing portion such as area B by driving circuit 136.When carrying out focus control once more on this RW area B, such as shown in figure 24 tracking signal (recommending TE) of recommending is output from differential amplifier 125.Formation so far is the same with embodiment 2 with processing, but in embodiment 2, after the lens displacement is met by the best in the embossing portion, correction is recommended the PPTBAL value of balance from DSP132 and recommend the biasing PPOFS of TE and make tracking Control stable toward recommending balancing circuitry 150 outputs, revising.In present embodiment 5, the formation that the signal regeneration performance is improved is described.
The signal that rocks that rocks testing circuit 1707 outputs from signal processing circuit 170 is imported into DSP132 through AD transducer 183.DSP132 can detect this level that rocks signal.Rock signal JIT and the actual proportional relation of rocking, hour level is low when rocking, when rocking level height when big.Figure 38 represents to setover and rock relation between the signal JIT because of the tracking that the output from the PPTBAL of DSP132 changes.Also have, the waveform equivalent circuit can become its characteristic programmable.In Figure 38, solid line is tracking under the characteristic that sets and the characteristic of rocking signal when actual signal regenerate, dotted line is in the characteristic that the lens under the situation about having set more on the low side for the degree of emphasizing of the signal band of waveform equivalent circuit are shifted and rock signal.Under the situation of the solid line of Figure 38, DSP132 obtains best tracking Control position by detecting flex point a, b and logical this mid point c of 2 that measures of rocking signal.Also have, in order further to improve precision, deliberately the setting of converted-wave equivalent circuit makes its characteristic become the characteristic of dotted line, by means of approximation of function or obtain and rock 2 the mid point that signal amplitude equates and detect this minimal point P, set and the corresponding tracking biasing of this adjusting position modified value PPTBAL.
Also have, the RF signal that is imported into signal processing circuit 170 also is imported into envelope detection circuit 181, and DSP132 can detect the amplitude of RF signal by AD transducer 182.It is such that tracking biasing that changes because of the output from the PPTBAL of DSP132 and RF amplitude are that relation that the RF envelope detection circuit is exported RFENV becomes Figure 39.Become the lens shift position that maximum point detects the best by seeking RFENV with DSP132, the same with above-mentioned situation of rocking, set the tracking biasing modified value PPTBAL suitable with this tracking Control position.
Also have, also have, code translator/error correcting circuit 1705 is input to the wrong counting number circuit 1700 that the mistake (ERR) that is taken place is counted.Mistake counting number circuit 1700 is input to DSP132 to the number that makes a mistake.It is such that the tracking biasing that changes because of PPTBAL output and the relation of margin of error become the characteristic of Figure 40, by obtaining and set the tracing positional that a that wrong number sharply begins to increase, the tracking amount of bias PPTBAL of mid point c of lens shift amount on the b can be adjusted to the best.The same with embodiment 2, after with phase differential TE lens displacements being regulated on the embossed area, determine to rock or margin of error becomes minimum or data (RF) signal becomes maximum tracking Control position.Promptly becoming on the best position operation in the regenerability of the signal that is recorded recommends balancing circuitry and regulates.Also have, but address signal must be recorded on the posting field in advance.Thereby, detect the record position of this address signal, determine the control position, make the amplitude that the regeneration of address signal is rocked or margin of error becomes minimum or address signal become maximum.Becoming on the best position operation in the regenerability of address signal recommends balancing circuitry and regulates.Thus, under the state that lens displacements has been corrected, can improve the quality of regenerated signal, and can guarantee the reliability of device.
Also have, at this moment, desirable can obtain recommending TE be biased to 0 signal promptly for signal also stable in the control of reference potential symmetry.But in fact, the detection efficiency possibility of the A～D of photodetector 114 circuit bias inconsistent or prime amplifier 115a～115d and matrix operation device may be inconsistent, therefore, when position that the control position is improved facing to regenerated signal, because of the push-pull channel offset signal becomes on the position that asymmetric, controlled target has been in partially, so it is unstable that tracking Control may become.Under these circumstances, as long as be unlikely to make the symmetry extreme difference that becomes just passable according to the clipping lever (limiter) of the set amount of PPTBAL input regulation.Thus, under the state of the security of having guaranteed necessary tracking Control, can improve the quality of signal.
According to the present invention, move the optical axis that causes and fall through even if produce along with the alignment error of optics or the thing lens because of initial that brought vertically are set, also can detect the signal suitable with this amount of movement is also revised, even make that amount of movement is that 0 thing lens normally are positioned on its position, obtains good tracking signal and RF signal.

Claims (24)

1. optical disc apparatus is characterized in that by forming with lower member: optical head, and it possesses the lens that light beam that handlebar produces by light source focuses on facing to information carrier; Moving part is used to make above-mentioned optical head to move towards the direction vertical with channel on the information carrier; Photodetector, it has the test section that is divided into a plurality of zones, is used for dividing on a plurality of zones the reflected light that detects from the information carrier of light beam; Phase difference detection portion is used to detect the phase differential of signal detected on a plurality of zones of above-mentioned photodetector; The phase differential channel departs from test section, is used for the position that is changed to by the detected phase difference variable of above-mentioned phase difference detection portion with light beam and interchannel is concerned corresponding signal; Phase differential tracking control section, its output signal that departs from test section according to above-mentioned phase differential channel drive above-mentioned moving part and control bundle scanning channel correctly; The lens displaced portions, the lens that are used for being added on the above-mentioned moving part to offset signal and make above-mentioned optical head are towards the direction vertical with above-mentioned channel mobile ormal weight only; Lens displacements correction portion is used for the flip-flop that appears on the output signal that above-mentioned phase differential channel departs from test section is set in the said lens displaced portions for minimum offset signal.
2. optical disc apparatus according to claim 1, it is characterized in that phase difference detection portion possesses the phase adjusted of control phase difference portion is arranged, lens displacements correction portion makes phase adjusted portion be changed ormal weight and detected phase differential in phase difference detection portion by desired value, depart from the conversion of test section institute at the phase differential channel signal on the flip-flop that occurs be set in the lens displaced portions for the offset signal of minimum.
3. optical disc apparatus according to claim 2, it is characterized in that lens displacements correction portion obtains the 1st function and the expression phase adjusted portion lens displaced portions under the 2nd the setting value amount of movement that is caused and the 2nd function that departs from the relation of the flip-flop that occurs on the output signal of test section at channel of the lens displaced portions of expression phase adjusted portion under the 1st setting value amount of movement that is caused and the relation that departs from the flip-flop that occurs on the output signal of test section at the phase differential channel, intersection point according to the 1st and the 2nd function is obtained offset signal, and the flip-flop of determining on the output signal that present channel departs from test section is minimum offset signal.
4. optical disc apparatus according to claim 2, it is characterized in that also possessing and have channel to depart from the biasing correction portion, obtaining in the offset signal of lens displaced portions by means of lens displacement correction portion, revise flip-flop, the output signal that makes the phase differential channel depart from test section becomes symmetrical for reference potential.
5. optical disc apparatus, but be a kind of regeneration reserved area with the embossing that has write down information in advance and the optical disc apparatus that is used for information carrier in 2 kinds of zones that forms and on channel, undertaken the posting field of information record by pilot channel by mark, it is characterized in that by forming with lower member: optical head, it possesses handlebar and faces toward the lens that information carrier focuses on by the light beam that light source produces; Moving part is used to make above-mentioned optical head to move towards the direction vertical with channel on the information carrier; Photodetector, it has the test section that is divided into a plurality of zones, is used for dividing on a plurality of zones the reflected light that detects from the information carrier of light beam; Phase difference detection portion is used to detect the phase differential of each signal on the zoning of above-mentioned photodetector; The 1st channel departs from test section, and it is according to concerning corresponding signal by the light beam on the regeneration reserved area of detected phase differential generation of above-mentioned phase difference detection portion and information carrier and the position of interchannel; Push-pull-detection portion, it detects the intensity of the light beam of diffraction on channel; The 2nd channel departs from test section, but its detection signal according to above-mentioned push-pull-detection portion generates light beam on the posting field with information carrier and the position of interchannel concerns corresponding signal; Phase differential tracking control section, its output signal that departs from test section according to above-mentioned the 1st channel drive above-mentioned moving part and the control bundle channel on the scan information carrier correctly; Recommend tracking control section, its output signal that departs from test section according to above-mentioned the 2nd channel drives above-mentioned moving part and the control bundle channel on the scan information carrier correctly; The lens displaced portions is used for being added on the above-mentioned moving part to offset signal and above-mentioned optical head is moved towards the direction vertical with channel on the information carrier; Lens displacements correction portion, it makes light beam be positioned on the regeneration reserved area of information carrier when device starts earlier and the flip-flop that appears on the output signal that above-mentioned the 1st channel departs from test section is set in the said lens displaced portions for minimum offset signal.
6. optical disc apparatus according to claim 5, it is characterized in that phase difference detection portion possesses the phase adjusted of control phase difference portion is arranged, lens displacement correction portion makes phase adjusted portion be changed ormal weight and detected phase differential in phase difference detection portion by desired value, is set in the lens displaced portions depart from the flip-flop that occurs on the detection signal of test section at the 1st channel for minimum offset signal.
7. optical disc apparatus according to claim 6, it is characterized in that lens displacements correction portion obtains the 1st function and the expression phase adjusted portion lens displaced portions under the 2nd the setting value amount of movement that is caused and the 2nd function that departs from the relation of the flip-flop that occurs on the detection signal of test section at the 1st channel of the lens displaced portions of expression phase adjusted portion under the 1st setting value amount of movement that is caused and the relation that departs from the flip-flop that occurs on the detection signal of test section at the 1st channel, intersection point according to the 1st and the 2nd function is obtained offset signal, and the flip-flop of determining on the detection signal that present the 1st channel departs from test section is minimum offset signal.
8. optical disc apparatus according to claim 6, it is characterized in that also possessing and have channel to depart from the biasing correction portion, when optical disc apparatus starts, light beam is moved on the regeneration reserved area of information carrier, when lens displacement correction portion has been set offset signal, light beam is moved on the write down usefulness zone of information carrier, revise the flip-flop that the 2nd channel departs from test section.
9. optical disc apparatus is characterized in that by forming with lower member: optical head, and it possesses the lens that light beam that handlebar produces by light source focuses on facing to information carrier; Moving part is used to make above-mentioned optical head to move towards the direction vertical with channel on the information carrier; Photodetector, it has the test section that is divided into a plurality of zones, is used for dividing on a plurality of zones the reflected light that detects from the information carrier of light beam; 3 bundle generating units are used for above-mentioned light beam is divided into the secondary bundle of leading secondary bundle and main beam and hysteresis; 3 bundle channels depart from test section, and the position that its output difference according to the leading secondary bundle of being divided by above-mentioned 3 bundle generating units and the secondary bundle that lags behind generates with above-mentioned main beam and interchannel concerns corresponding signal; 3 bundle tracking control section, its output signal that departs from test section according to above-mentioned 3 bundle channels drive above-mentioned moving part and control bundle scanning channel correctly; The lens displaced portions, the lens that are used for being added on the above-mentioned moving part to offset signal and make above-mentioned optical head are towards the direction vertical with above-mentioned channel mobile ormal weight only; Lens displacements correction portion, be used for above-mentioned 3 bundle channels depart from test section conversion the amplitude of the signal offset signal that becomes maximum be set in the said lens displaced portions.
10. optical disc apparatus according to claim 9, it is characterized in that also possessing and have channel to depart from the biasing correction portion, when having set the offset signal of lens displaced portions by means of lens displacement correction portion, revise remaining biasing, make 3 bundle channels depart from test section conversion signal for the reference potential symmetry that becomes.
11. optical disc apparatus, be a kind of regeneration reserved area with the embossing that has write down information in advance and by concavo-convex Address Part with but pilot channel forms and carry out the optical disc apparatus that is used for information carrier of 2 kinds of information areas of the posting field of information record on above-mentioned pilot channel, it is characterized in that by forming with lower member: optical head, it possesses handlebar and faces toward the lens that information carrier focuses on by the light beam that light source produces; Moving part is used to make above-mentioned optical head to move towards the direction vertical with channel on the information carrier; Optical detection part, it has the test section that is divided into a plurality of zones, and is used for dividing on a plurality of zones the reflected light that detects from the information carrier of light beam; Phase difference detection portion, it detects the phase differential of each signal on the zoning of above-mentioned photodetector; The 1st channel departs from test section, and it is according to concerning corresponding signal by the light beam on the regeneration reserved area of detected phase differential generation of above-mentioned phase difference detection portion and information carrier and the position of interchannel; Push-pull-detection portion, it detects the intensity of the light beam of diffraction on the channel of light beam; The 2nd channel departs from test section, but its signal according to above-mentioned push-pull-detection portion generates light beam on the posting field with information carrier and the position of interchannel concerns corresponding signal; Phase differential tracking control section, its output signal that departs from test section according to above-mentioned the 1st channel drive above-mentioned moving part and control bundle scanning channel correctly; Recommend tracking control section, its output signal that departs from test section according to above-mentioned the 2nd channel drives above-mentioned moving part and control bundle scanning channel correctly; Reproducing unit, but it is according to the address and the information of regenerative recording on the posting field of information carrier of the signal regeneration information carrier of above-mentioned photodetector; The lens displaced portions is used for being added on the above-mentioned moving part to offset signal and the lens of above-mentioned optical head is moved towards the direction vertical with above-mentioned channel; Lens displacements correction portion is used for offset signal is applied to the biasing correction portion of recommending on the tracking control section, the flip-flop that appears on the signal that above-mentioned the 1st channel departs from test section is set in the said lens displaced portions for the offset signal of minimum; Characteristics Detection portion, its Characteristics Detection according to the regenerated signal of being regenerated by reproducing unit goes out initial lens displacement; Lens displacement adjusting portion, it regulates detected initial lens displacement by Characteristics Detection portion makes the characteristic of regenerated signal become the best.
12. optical disc apparatus according to claim 11, it is characterized in that by the rock composition of the detected characteristic of above-mentioned Characteristics Detection portion said lens displacement adjusting portion has applied the biasing back in said lens displacement correction portion and regulated above-mentioned biasing correction portion and make that rocking composition becomes minimum for the regenerated signal of the information of regenerating based on reproducing unit.
13. optical disc apparatus according to claim 11, it is characterized in that the error rate of the detected characteristic of above-mentioned Characteristics Detection portion for the regenerated signal of the information of being regenerated by information regeneration portion, said lens displacement adjusting portion has applied the biasing back in said lens displacement correction portion and has regulated above-mentioned push-pull-detection portion and makes error rate become minimum.
14. optical disc apparatus according to claim 11, it is characterized in that by the detected characteristic of above-mentioned Characteristics Detection portion be reproducing unit regeneration address signal rock composition, said lens displacement adjusting portion has applied the biasing back in said lens displacement correction portion and has regulated above-mentioned push-pull-detection portion and make that rocking composition becomes minimum.
15. optical disc apparatus according to claim 11, it is characterized in that the detected characteristic of above-mentioned Characteristics Detection portion was the error rate of the reproducing unit address signal of regenerating, said lens displacement adjusting portion has applied the biasing back in said lens displacement correction portion and has regulated above-mentioned push-pull-detection portion and makes the error in address rate become minimum.
16. optical disc apparatus according to claim 11 is characterized in that the balance portion that recommends that lens displacement adjusting portion possesses to be had operation the 2nd channel to depart from the gain balance of test section and apply biasing.
17. optical disc apparatus according to claim 11, it is characterized in that when optical disc apparatus starts, light beam being moved on the regeneration reserved area of information carrier, when scioptics displacement correction portion had detected the offset signal of lens displaced portions, went up and startup lens displacement adjusting portion in the write down usefulness zone that light beam is moved to information carrier.
18. optical disc apparatus according to claim 17 is characterized in that the offset signal that lens displacement correction portion sets limits within the limits prescribed.
19. optical disc apparatus according to claim 18 is characterized in that symmetry that offset signal that lens displacements correction portion sets is defined as the 2nd road offset signal on the write down usefulness zone that makes information carrier within the limits prescribed.
20. an optical disc apparatus is characterized in that by forming with lower member: optical head, it possesses handlebar and faces toward the lens that information carrier focuses on by the light beam that light source produces; Moving part is used to make above-mentioned optical head to move towards the direction vertical with channel on the information carrier; Photodetector, it has the test section that is divided into a plurality of zones, is used for dividing on a plurality of zones the reflected light that detects from the information carrier of light beam; Channel departs from test section, is used for the output transform of above-mentioned photodetector is concerned corresponding road offset signal for the position with light beam and interchannel; Channel tracking control part, its output signal that departs from test section according to above-mentioned channel drive above-mentioned moving part and control bundle scanning channel correctly; The lens displaced portions is used for being added on the above-mentioned moving part to offset signal and makes above-mentioned optical head towards the direction vertical with above-mentioned channel mobile ormal weight only; Characteristics Detection portion, it detects the characteristic of the regenerated signal of being regenerated by reproducing unit; Lens displacement adjusting portion is used for being set in the said lens displaced portions according to by the detected characteristic of Characteristics Detection portion the regenerated signal characteristic being become best offset signal.
21. optical disc apparatus according to claim 20, it is characterized in that the inspection of above-mentioned Characteristics Detection portion by to above-mentioned photodetector and signal carry out the waveform equivalence the regenerated signal handling part, output signal 2 values of above-mentioned regenerated signal handling part and detect and synchronous regeneration time clock between the test section that rocks that rocks forms, the said lens offset signal that the adjusting portion handle rocks to minimum that is shifted is set on the said lens displaced portions.
22. optical disc apparatus according to claim 20 is characterized in that above-mentioned Characteristics Detection portion detects above-mentioned photodetector and amplitude signal, said lens displacement adjusting portion handle and signal amplitude are set on the said lens displaced portions for maximum offset signal.
23. optical disc apparatus according to claim 20, it is characterized in that the inspection of above-mentioned Characteristics Detection portion is by above-mentioned photodetector carried out the regenerated signal handling part of waveform equivalence with signal, 2 value portions of output signal 2 values of above-mentioned regenerated signal handling part, make the signal and the synchronous phase-locked portion of regeneration time clock of above-mentioned 2 value portions, by above-mentioned phase-locked the error correction portion that error correction was deciphered and carried out to the output signal to the 2 value portions relevant with phase-locking, the error count portion that the mistake that produces when the error correction that is caused by above-mentioned error correction portion is detected and counts forms, and said lens displacement adjusting portion becomes minimum or wrong number to the wrong number of being counted by above-mentioned error count portion and becomes minimum scope and become maximum offset signal and be set on the said lens displaced portions.
24. optical disc apparatus according to claim 20 is characterized in that also possessing the biasing correction portion is arranged, and when having set the offset signal of lens displaced portions by means of lens displacement correction portion, revises the biasing of the remainder of road offset signal.
CNB001030310A 1999-03-02 2000-03-01 Optical disk device Expired - Fee Related CN1176460C (en)

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JP5407899 1999-03-02
JP054078/1999 1999-03-02

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KR20030066465A (en) * 2002-02-05 2003-08-09 마츠시타 덴끼 산교 가부시키가이샤 Apparatus for controlling tracking and optical disc device
JP4050738B2 (en) * 2003-11-07 2008-02-20 松下電器産業株式会社 Address signal position detecting device, optical disk reproducing device, and address signal position detecting method

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