CN100476963C - Optical disc apparatus - Google Patents

Optical disc apparatus Download PDF

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Publication number
CN100476963C
CN100476963C CNB2007100054054A CN200710005405A CN100476963C CN 100476963 C CN100476963 C CN 100476963C CN B2007100054054 A CNB2007100054054 A CN B2007100054054A CN 200710005405 A CN200710005405 A CN 200710005405A CN 100476963 C CN100476963 C CN 100476963C
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focus
mentioned
drive
inclination
output
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CN101004924A (en
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近藤健二
久世雄一
藤亩健司
山田真一
渡边克也
阿部雅祥
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

An optical disc apparatus comprises: rotating means, a light source, converging means, focus error detecting means for detecting a difference between said data side and the focus of the light beam converged by said converging means; focus direction transferring means for transferring said converging means in a direction perpendicular to said data side; focus controlling means for driving said focus direction transferring means based on the output of said focus error detecting means in such a way that said light beam converges on said data side in a predetermined state; tracking direction transferring means for transferring said light source in the radius direction of said information recording medium; and tilt calculating means for calculating average values of the outputs of said focus controlling means obtained for a period of time, which is an integer multiple of a period during which said information recording medium makes one rotation at two different points in said radius direction and calculating an inclination of said data side based on said average values at said two different points.

Description

Optical disc apparatus
The application is that application number is 02157053.1, the applying date is on Dec 19th, 2002, the application people is the scheme application of the application for a patent for invention of optical disc apparatus for Panasonic Electric Equipment Industrial Co.,Ltd, denomination of invention.
Technical field
The present invention relates to a kind of optical disc apparatus, is to utilize light beam at recording medium identifying recording layers such as CDs, and the optical disc apparatus that is reproduced in the data that write down on the recording medium.Particularly have the optical disc apparatus of control for the mechanism of the incident angle of the light beam of the data surface of recording medium about it.
Background technology
In optical disc apparatus, the optical axis for to the light beam of the recording medium irradiation of optical disc apparatus etc. is called the pitch angle to data surface from the angle that vertically staggers, and is not the pitch angle that zero situation calls run-off the straight.Along with the recording density raising of recording mediums such as CD, the control pitch angle becomes important problem.During the run-off the straight angle,, thereby guarantee that the performance of optical disc apparatus just becomes difficult because the record or the deterioration of beating of reproducing signal become significantly.
Fig. 1 (a) and (b), the cross section of the light beam of projection on the optical disc data face when when being illustrated in the pitch angle and not taking place and pitch angle takes place.In addition, Fig. 2 (a) and (b) is expression beating and the performance plot of error rate with respect to the reproducing signal of tilt quantity.From Fig. 1 and Fig. 2 as can be known, owing to tilt to produce coma aberration, its result causes the deterioration of beating of reproducing signal and the rising of error rate.
When surpassing permissible value, can not carry out the record and the reproduction of optimum condition, and produce the low problem of reliability of data by the aberration that tilts to produce.In addition, with respect to the permission amplitude of the aberration at this pitch angle, along with the recording density of CD increases and narrows down, the record-playback performance of the guaranteeing device difficulty that just becomes.
In order to ensure performance to the record-playback of high density compact disc, the position of being not only the machinery of optical system and drive system coincide and adjusts, sensor special also to be set detect the pitch angle, by importing the inclination control of suitably tilt shaven head or object lens, revise the pitch angle, the optical disc apparatus of realizing best record and reproduction was just known from the past.
Fig. 3 is the calcspar of the formation of this optical disc apparatus in the past of expression.Below, the focus control of optical disc apparatus shown in Figure 3 and the control of tilting are described.
The light beam that sends from the light source 1 of semiconductor laser etc. by beam splitter 3, shines on the data surface (signal recording surface) as the CD 2 of recording medium by object lens 4 packs as the bunching system of pack light beam.By the back light of the light beam of the data surface diffraction reflection of CD 2,, receive light and detect by detecting device 5 as the reception electro-optical device that receives back light by beam splitter 3 reflections.Object lens 4 can change the pack state of the light beam on the data surface of CD 2 by moving to vertical direction (following this direction is called focus direction) as the focusing executive component 6 of mobile device with respect to data surface.
By the detection signal of the back light of exporting from detecting device 5, be input to as the FE signal generating unit 7 of generation corresponding to the focusing-error detecting device of the focus error signal (FE signal) of the pack state of the light beam on the data surface of CD 2, generate the FE signal.The FE signal is imported into phase compensation portion 8, and for example the phase deviation that is made of the digital filter of DSP (digital signal processor) after low territory off-centre circuit passes through, is exported as focus drive signal.Focus drive signal is exaggerated at focusing drive division 9, drives by amplifying signal and focuses on executive component 6, realizes making the pack State Control of the light beam on the optical disc data face for always being in the focus control of the pack state of regulation.
Below, the inclination control of the optical disc apparatus in the past of key diagram 3.Detection shines the inclination sensor 10 of the inclination of the optical axis of light beam of CD 2 and data surface, by towards the light source 42 of the radiative light emitting diode of data surface of CD 2 etc. and receive the reflected light that comes from data surface, the detecting device 43 of output detection signal constitutes.
Shine the inclination executive component 11 of optical axis tiling arrangement of optical axis of the light beam of CD 2 as fascinating,, can change CD 2 and shine the inclination of the optical axis of the light beam on the CD 2 by the shaven head 12 that fascinates.Tilt signals generating unit 13 is used the detection signal that comes out from inclination sensor 10, generates the tilt signals corresponding to the inclination of the data surface of CD 2 and optical axis.Inclination control part 14 collect tilt signals with inclination executive component drive signal output to inclination executive component 11, thus, illumination beam orthogonally always on the signal recording surface of CD 2 has been realized the inclination control of control shaven head 12.
In inclination control in the past, problem shown below is arranged.
In the tilt detection of using inclination sensor, make detection position and the position consistency that shines the light beam on the optical disc data face by inclination sensor, be difficult on spatial configuration.Be because the vertical lower shaven head (particularly object lens 4) of the irradiation position on the optical disc data face always exists.Therefore, inclination sensor detects is the inclination of CD that separates the position of some distances from light-beam position.Its result, when the data surface of CD 2 was curve form, inclination sensor can not correctly detect the pitch angle of light-beam position, and produce the problem that can not carry out correct inclination control.
In addition, each its characteristic by inclination sensor is discrete, and the configuration error when between the driving mechanism of inclination sensor and rotation shaven head 12 and CD, producing assembling etc., between pitch angle of detecting by inclination sensor and actual pitch angle, produce dislocation (zero migration).In order to make this zero migration is below the setting, in the assembling procedure of device each optical disc apparatus is all needed to do accurate adjustment.Its result, the problem that rises with regard to the production cost that produces optical disc apparatus.
And then, even in the assembling procedure of device, adjust zero migration, also can produce error by the frequent variation and the temperature characterisitic of inclination sensor.By the error after such assembling, also be created in the problem that inclination sensor can not be done correct inclination control.
How little by the strong request profile information machine of market sale in recent years is.But in above-mentioned optical disc apparatus in the past,, make bare headed miniaturization just become difficult in order to ensure the installing space of inclination sensor.Therefore, make the optical disc apparatus miniaturization just become difficult.In addition, inclination sensor itself also constitutes the essential factor of the cost rising that makes optical disc apparatus.
The object of the present invention is to provide, solve at least one of above-mentioned problem, can correctly carry out the record of data, the optical disc apparatus of reproduction by appropriate tilt control.
Summary of the invention
Optical disc apparatus of the present invention, it has: the whirligig of rotary information recording medium, with light source towards the data surface illumination beam of information recording carrier, bunching system with the above-mentioned light beam of pack, and the focusing-error detecting device that staggers between detection and above-mentioned data surface and the beam focus by above-mentioned bunching system pack, with the focus direction mobile device that above-mentioned bunching system is moved to the direction vertical with above-mentioned data surface, with the state pack of above-mentioned light beam on above-mentioned data surface with regulation, drive the focus control device of above-mentioned focus direction mobile device based on the output of above-mentioned focusing-error detecting device, with the tracking direction mobile device of the radial direction that above-mentioned light source is moved to above-mentioned information recording carrier, with above-mentioned radial direction different 2 try to achieve respectively integral multiple during above-mentioned information recording carrier rotated for 1 week during the output mean value of the above-mentioned focus control device that obtains, based on above-mentioned 2 different mean value, ask the inclination calculation element of the inclination of above-mentioned data surface.
In certain desirable embodiment, above-mentioned whirligig, when being positioned at all sides of above-mentioned information recording carrier with above-mentioned light source relatively, situation rotational speed when being positioned at outer circumferential side makes the rotation of above-mentioned information recording carrier with diminishing, and comparison became little when the value that makes above-mentioned multiple and above-mentioned light source were positioned at all side of above-mentioned information recording carrier when being positioned at outer circumferential side.
The incline controller of object lens of the present invention has, output drives the 1st drive unit of the motivation value of the 1st focus direction mobile device that the end make object lens moves to its focus direction, drive the 2nd drive unit of the motivation value of the 2nd focus direction mobile device that the other end make object lens moves to its focus direction with output, with the motivation value that detects above-mentioned the 1st drive unit and above-mentioned the 2nd drive unit, export their drive level device for detecting difference of difference and the difference that makes above-mentioned motivation value value ground for regulation, control the control device of above-mentioned the 1st drive unit and above-mentioned the 2nd drive unit.
In certain desirable embodiment, above-mentioned control device is a reference level with the difference in the above-mentioned motivation value of the state that stops above-mentioned the 1st drive unit and above-mentioned the 2nd drive unit, controls above-mentioned the 1st drive unit and above-mentioned the 2nd drive unit.
In certain desirable embodiment, above-mentioned control device, make above-mentioned the 1st focus direction mobile device and above-mentioned the 2nd focus direction mobile device respectively when the dialysis of above-mentioned the 1st drive unit and above-mentioned the 2nd drive unit electricity is opened, to be reference level to the difference of the motivation value of above-mentioned the 1st focus direction mobile device and above-mentioned the 2nd focus direction mobile device output above-mentioned motivation value when being zero respectively, control above-mentioned the 1st drive unit and above-mentioned the 2nd drive unit.
In certain desirable embodiment, the incline controller of object lens makes the said reference level upgrade at interval with official hour.Perhaps and then have a temperature sensor, change to setting when above, upgrade the said reference level in the output of said temperature sensor.
In addition, optical disc apparatus of the present invention, have: the object lens of pack light beam, the 1st focus direction mobile device that moves to its focus direction with a end with above-mentioned object lens, with the 2nd focus direction mobile device that the other end of above-mentioned object lens is moved to its focus direction with at above-mentioned one of them described object lens inclining control device.
In certain desirable embodiment, above-mentioned optical disc apparatus, and then have: the whirligig of rotary information recording medium, with light source towards the data surface illumination beam of information recording carrier, and the focusing-error detecting device that staggers between above-mentioned data surface of detection and the beam focus by above-mentioned bunching system pack, tracking direction mobile device with the radial direction that above-mentioned light source is moved to above-mentioned information recording carrier, with 2 different outputs of trying to achieve above-mentioned focus control device respectively at above-mentioned radial direction, based on above-mentioned 2 different output, ask the inclination calculation element of the inclination of above-mentioned data surface; Based on the result of calculation of above-mentioned inclination calculation element, the value of decision afore mentioned rules.
Focusing drive device of the present invention, have, output drives the drive unit of the motivation value of the focus direction mobile device that object lens are moved to its focus direction, with the drive level pick-up unit that detects above-mentioned motivation value, above-mentioned motivation value is output as reference level with the above-mentioned drive level pick-up unit that is set at zero state, and based on the DC level of the output of the above-mentioned drive unit of said reference level trim.
In addition, focusing drive device of the present invention has, output drive the focus direction mobile device that object lens are moved to its focus direction motivation value drive unit and detect the drive level pick-up unit of above-mentioned motivation value; Above-mentioned drive level pick-up unit when stopping the action of above-mentioned drive unit in specified time limit is output as reference level, based on the DC level of the output of the above-mentioned drive unit of said reference level trim.
In addition, focusing drive device of the present invention has, output drive the focus direction mobile device that object lens are moved to its focus direction motivation value drive unit and detect the drive level pick-up unit of above-mentioned motivation value; When electric dialysis is opened from above-mentioned focus direction mobile device with above-mentioned drive level pick-up unit, above-mentioned drive level pick-up unit in the time of serving as zero with the motivation value that will export to above-mentioned focus direction mobile device is output as reference level, revises the DC level of the output of above-mentioned drive unit based on the said reference level.
In certain desirable embodiment, focusing drive device is upgraded the said reference level at interval with official hour.Perhaps, and then has a temperature sensor, become the tracking direction mobile device that the radial direction of breath recording medium moves in the output of said temperature sensor, and generate the tracking error detecting device of the tracking error signal that staggers between the position of expression by the light beam of above-mentioned object lens pack and regulation, with be output as the relation ground of regulation, the control module device of the above-mentioned drive unit of control at above-mentioned one of them described tracking drive unit and above-mentioned tracking error signal and above-mentioned drive level pick-up unit.
In certain desirable embodiment, above-mentioned optical disc apparatus, and then have: the whirligig of rotary information recording medium and shine the light source of above-mentioned light beam towards the data surface of information recording carrier.
The incline controller of object lens of the present invention has: output drive to change object lens inclination the object lens inclining device motivation value drive unit and detect the drive level pick-up unit of above-mentioned motivation value; Above-mentioned motivation value is output as reference level with the above-mentioned drive level pick-up unit that is set at zero state, revises the DC level of the output of above-mentioned drive unit based on the said reference level.
In addition, the incline controller of object lens of the present invention has: output drive to change object lens inclination the object lens inclining device motivation value drive unit and detect the drive level pick-up unit of above-mentioned motivation value; Be output as reference level with the above-mentioned drive level pick-up unit of action when stop specified time limit, revise the DC level of the output of above-mentioned drive unit based on the said reference level above-mentioned drive unit.
In addition, the incline controller of object lens of the present invention has: output drive to change object lens inclination the object lens inclining device motivation value drive unit and detect the drive level pick-up unit of above-mentioned motivation value; With above-mentioned drive level pick-up unit when the dialysis of the tilting gearing of object lens electricity is left, above-mentioned drive level pick-up unit when will be set at zero to the motivation value of above-mentioned tracking direction mobile device output is output as reference level, revises the DC level of the output of above-mentioned drive unit based on the said reference level.
In certain desirable embodiment, the incline controller of object lens makes the said reference level upgrade at interval with official hour.Perhaps, and then have temperature sensor, change to setting when above, upgrade the said reference level in the output of said temperature sensor.
In addition, optical disc apparatus of the present invention, have: the object lens of pack light beam, object lens inclining device with the inclination that changes object lens, the value ground that is output as regulation with incline controller and above-mentioned drive level pick-up unit, the control module device of the above-mentioned drive unit of control at above-mentioned one of them described object lens.
The tracking direction mobile device that the radial direction of breath recording medium moves, and generate the tracking error detecting device of the tracking error signal that staggers between the position of expression by the light beam of above-mentioned object lens pack and regulation, with be output as the relation ground of regulation, the control module device of the above-mentioned drive unit of control at above-mentioned one of them described tracking drive unit and above-mentioned tracking error signal and above-mentioned drive level pick-up unit.
In certain desirable embodiment, above-mentioned optical disc apparatus, and then have: the whirligig of rotary information recording medium and shine the light source of above-mentioned light beam towards the data surface of information recording carrier.
The incline controller of object lens of the present invention has: output drive to change object lens inclination the object lens inclining device motivation value drive unit and detect the drive level pick-up unit of above-mentioned motivation value; Above-mentioned motivation value is output as reference level with the above-mentioned drive level pick-up unit that is set at zero state, revises the DC level of the output of above-mentioned drive unit based on the said reference level.
In addition, the incline controller of object lens of the present invention has: output drive to change object lens inclination the object lens inclining device motivation value drive unit and detect the drive level pick-up unit of above-mentioned motivation value; Be output as reference level with the above-mentioned drive level pick-up unit of action when stop specified time limit, revise the DC level of the output of above-mentioned drive unit based on the said reference level above-mentioned drive unit.
In addition, the incline controller of object lens of the present invention has: output drive to change object lens inclination the object lens inclining device motivation value drive unit and detect the drive level pick-up unit of above-mentioned motivation value; With above-mentioned drive level pick-up unit when the dialysis of the tilting gearing of object lens electricity is left, above-mentioned drive level pick-up unit when will be set at zero to the motivation value of above-mentioned tracking direction mobile device output is output as reference level, revises the DC level of the output of above-mentioned drive unit based on the said reference level.
In certain desirable embodiment, the incline controller of object lens makes the said reference level upgrade at interval with official hour.Perhaps, and then have temperature sensor, change to setting when above, upgrade the said reference level in the output of said temperature sensor.
In addition, optical disc apparatus of the present invention, have: the object lens of pack light beam, object lens inclining device with the inclination that changes object lens, the value ground that is output as regulation with incline controller and above-mentioned drive level pick-up unit, the control module device of the above-mentioned drive unit of control at above-mentioned one of them described object lens.
In certain desirable embodiment, above-mentioned optical disc apparatus, and then have: the whirligig of rotary information recording medium and shine the light source of above-mentioned light beam towards the data surface of information recording carrier.
In addition, optical disc apparatus of the present invention, have: towards the light source of the data surface illumination beam of information recording carrier, bunching system with the pack light beam, move the mobile device of above-mentioned bunching system with the variable in distance that makes above-mentioned bunching system and above-mentioned data surface, with the reception electro-optical device of reception from the back light of above-mentioned data surface beam reflected, with based on the signal that sends from above-mentioned reception electro-optical device, the focusing-error detecting device of the signal of the pack state of the light beam on the data surface of the above-mentioned information recording carrier of generation response, with based on the signal that sends from above-mentioned focusing-error detecting device to above-mentioned mobile device output drive signal, the focus control device that above-mentioned light beam is controlled for the pack state of regulation, with the tilting gearing that above-mentioned bunching system is tilted, with at least 1 calculating formula using for the shape of calculating above-mentioned data surface based on above-mentioned drive signal decision, use the calculating formula of above-mentioned decision try to achieve above-mentioned data surface tilt quantity the inclination calculation element and according to above-mentioned tilt quantity, drive tilting gearing, with respect to above-mentioned data surface, light beam vertically shines and the incline controller controlled substantially.
In certain desirable embodiment, above-mentioned inclination calculation element based on the above-mentioned drive signal of trying to achieve later in decision aforementioned calculation formula, upgrades the calculating formula of above-mentioned decision.
In certain desirable embodiment, above-mentioned inclination calculation element, after above-mentioned information recording carrier is encased in above-mentioned optical disc apparatus, before writing down for above-mentioned information recording carrier and reproducing, carry out: the initial detecting of the drive signal of carrying out in order to determine the aforementioned calculation formula and for above-mentioned information recording carrier at record with in reproducing, the additional detection of the drive signal of carrying out for the renewal of aforementioned calculation formula.
In certain desirable embodiment, above-mentioned inclination calculation element is a plurality of check points that the different radial location of above-mentioned data surface is set, the drive signal decision aforementioned calculation formula of the focus control device that obtains when the above-mentioned data surface of irradiation based on above-mentioned light beam.
In certain desirable embodiment, above-mentioned inclination calculation element, for above-mentioned information recording carrier at record with in reproducing, each above-mentioned light beam arrive or by above-mentioned a plurality of check points one of them the time, all carry out the detection of drive signal and the renewal of aforementioned calculation formula.
In certain desirable embodiment, above-mentioned inclination calculation element, before above-mentioned initial detecting, the above-mentioned drive signal of a plurality of position probing at the radial direction of above-mentioned information recording carrier, judge the warped shapes of above-mentioned data surface from testing result, based on the result of above-mentioned judgement, decision detects the position of the check point of drive signal in above-mentioned initial detecting and above-mentioned additional detection.
Above-mentioned inclination calculation element, warped shapes to above-mentioned data surface, when being judged as the 1st shape, configuration at a plurality of check points of above-mentioned initial detecting and above-mentioned additional detection, compare with the middle perimembranous of above-mentioned data surface, perimembranous and peripheral part are setting to high-density within it, to the warped shapes of above-mentioned data surface, when being judged as the 2nd shape, being equally spaced in interior perimembranous, middle perimembranous and peripheral part in the position of a plurality of check points of above-mentioned initial detecting and above-mentioned additional detection and setting.
In certain desirable embodiment, optical disc apparatus, and then the error detecting apparatus that reads in error that produces when having the write error that detection produces or being reproduced in the data that write down on the above-mentioned data surface when above-mentioned data surface identifying recording layer, to detection, carry out based on the signal of above-mentioned error detecting apparatus in the employed above-mentioned drive signal of renewal of the aforementioned calculation formula of above-mentioned additional detection.
In certain desirable embodiment, above-mentioned error detecting apparatus, and then have the symbol error that detects the symbol error correct the data of reproducing from above-mentioned information recording carrier and correct device, when the symbol error number of correcting device whenever above-mentioned symbol error surpasses setting, carry out above-mentioned additional detection.
In certain desirable embodiment, above-mentioned error detecting apparatus has the error in address pick-up unit of the reconstruction error of the address information that detects the positional information be equivalent to above-mentioned data surface, and above-mentioned reconstruction error whenever surpasses stated number and just carries out above-mentioned additional detection.
In certain desirable embodiment, optical disc apparatus, have from the snubber assembly of the data and the data of the temporary transient put of difference above-mentioned information recording carrier of above-mentioned information recording carrier reproduction, carry out above-mentioned additional detection based on the data volume that leaves above-mentioned snubber assembly in.
In certain desirable embodiment, in the time interval of the detection of the above-mentioned drive signal of above-mentioned additional detection, the situation of reproducing data from above-mentioned information recording carrier be different in situation to above-mentioned information recording carrier record data.
In certain desirable embodiment, optical disc apparatus, and then have temperature sensor, when changing, the output of said temperature sensor carries out above-mentioned additional detection more than setting.
In certain desirable embodiment, the calculating formula of above-mentioned inclination calculation element contains the warping function of the inclination of approximate above-mentioned data surface, in above-mentioned additional detection, sets the number of times of above-mentioned warping function when upgrading the aforementioned calculation formula.
In certain desirable embodiment, optical disc apparatus, and then have and make the whirligig of above-mentioned information recording carrier with the rotation number rotation of regulation, the above-mentioned drive signal of focus control device output, be above-mentioned information recording carrier rotate integral multiple during 1 week during mean value.
In certain desirable embodiment, optical disc apparatus, and then have: make above-mentioned information recording carrier with the whirligig of the rotation number rotation of regulation and for above-mentioned information recording carrier when writing down and reproduce, to above-mentioned whirligig control its linear velocity serve as necessarily, when the above-mentioned initial detecting, above-mentioned whirligig is controlled its angular velocity is certain rotating control assembly.
In certain desirable embodiment, above-mentioned inclination calculation element when one of above-mentioned a plurality of check points carry out the detection of above-mentioned drive signal more than 2 times, uses the mean value of the value of the drive signal that so far obtains, and carries out the renewal of aforementioned calculation formula.
In certain desirable embodiment, above-mentioned inclination calculation element, when one of above-mentioned a plurality of check points carry out the detection of above-mentioned drive signal more than 2 times, the value of the drive signal that obtains for detection so far, if beyond the specialized range, then the testing result of its drive signal is judged as incorrectly, stops the renewal of aforementioned calculation formula.
In certain desirable embodiment, above-mentioned at least 1 calculating formula, contain the approximate data face warpage warping function and be illustrated in the inclination approximate function of inclination of the optional position of radial direction.
In certain desirable embodiment, the calculating formula of above-mentioned inclination calculation element contains polygronal function.
In certain desirable embodiment, above-mentioned inclination calculation element, to above-mentioned information recording carrier at record with when reproducing, whenever above-mentioned light beam arrive or by above-mentioned a plurality of check points one of them the time, carry out the detection of drive signal, the value of all drive signals of using when correction determines above-mentioned polygronal function based on testing result is upgraded polygronal function based on the value of the drive signal of revising.
In certain desirable embodiment, the middle perimembranous of the configuration of a plurality of check points in above-mentioned initial detecting and above-mentioned additional detection and above-mentioned data surface is the high setting of density in interior perimembranous and peripheral part relatively.
In certain desirable embodiment, when the data surface of above-mentioned information recording carrier has the 1st and the 2nd recording layer, the inclination calculation element determines respectively in order to calculate the above-mentioned the 1st and the shape of the 2nd recording layer and 1 calculating formula using at least, uses the calculating formula of above-mentioned decision to ask the tilt quantity of the above-mentioned the 1st and the 2nd recording layer and above-mentioned bunching system.
In certain desirable embodiment, above-mentioned mobile device, be to make above-mentioned bunching system omit a pair of focusing executive component that vertical direction drives for above-mentioned data surface, above-mentioned tilting gearing is the above-mentioned a pair of focusing executive component that drives above-mentioned bunching system for above-mentioned data surface obliquely.
In certain desirable embodiment, above-mentioned mobile device, be to make above-mentioned bunching system omit a pair of focusing executive component that vertical direction drives for above-mentioned data surface, above-mentioned tilting gearing is the inclination executive component that drives above-mentioned bunching system for above-mentioned data surface obliquely.
The control method of optical disc apparatus of the present invention, include: for the pack normality of the light beam on the data surface that keeps shining information recording carrier for regulation, make the step of the bunching system of the above-mentioned light beam of pack in the direction driving vertical with above-mentioned data surface, step with the mean value of the drive signal of the above-mentioned bunching system that obtains during the integral multiple of asking driving during above-mentioned information recording carrier rotated for 1 week, with ask above-mentioned mean value respectively different 2 of the radial direction of above-mentioned information recording carrier, based at above-mentioned 2 different mean value, ask above-mentioned data surface inclination step and based on the inclination of above-mentioned data surface, change the step of the inclination of above-mentioned bunching system.
The method for controlling oblique of object lens of the present invention, include: the step that drives the two ends of object lens to its focus direction, with the step of the difference of the drive signal that detect to drive above-mentioned two ends with to make the difference of above-mentioned drive signal be the step that above-mentioned the 1st drive unit and above-mentioned the 2nd drive unit are controlled in setting ground.
In addition, the driving method of object lens of the present invention, include: output makes object lens move and drive the step of the drive signal of mobile device to prescribed direction, with the step that detects above-mentioned drive signal and make above-mentioned drive signal be set at zero state, with the value that detects by above-mentioned detection step be reference level, based on the step of the DC level of the above-mentioned drive signal of said reference level trim.
In addition, the driving method of object lens of the present invention, include: output makes object lens move and drive the step of the drive signal of mobile device to prescribed direction, with the step that detects above-mentioned drive signal and so that the output of above-mentioned drive signal be reference level, revise the step of the DC level of drive signal based on the said reference level by the value that the above-mentioned detection step when stop specified time limit detecting.
In addition, the driving method of object lens of the present invention, include: output makes object lens move and drive the step of the drive signal of mobile device to prescribed direction, the value that detects with the step that detects above-mentioned drive signal with when the device and above-mentioned mobile device of the above-mentioned drive signal of output are opened in electric dialysis, with the above-mentioned detection step when making above-mentioned drive signal serve as zero is reference level, revise the step of the DC level of drive signal based on the said reference level.
In certain desirable embodiment, the direction of afore mentioned rules is a focus direction.
In certain desirable embodiment, the direction of afore mentioned rules is a tracking direction.
In certain desirable embodiment, the direction of afore mentioned rules is a vergence direction.
In addition, the control method of optical disc apparatus of the present invention, include: in order to change the pack state of the light beam on the data surface that shines information recording carrier, make the step of the bunching system of the above-mentioned light beam of pack to the direction driving vertical with above-mentioned data surface, with the step of reception from the back light of above-mentioned data surface beam reflected, with based on the signal that sends from above-mentioned reception electro-optical device, the step of the signal of the pack state of the light beam on the data surface of the above-mentioned information recording carrier of generation response, with signal based on the above-mentioned pack state of response, to the device output drive signal that moves above-mentioned bunching system, make above-mentioned light beam be the step of the pack state ground control of regulation, with at least 1 calculating formula using for the shape of calculating above-mentioned data surface based on above-mentioned drive signal decision, use the calculating formula of above-mentioned decision ask above-mentioned data surface and above-mentioned bunching system tilt quantity step and according to above-mentioned tilt quantity, drive the device of the inclination that changes above-mentioned bunching system, light beam is vertically shone substantially and the step controlled for above-mentioned data surface.
In addition, the control method of optical disc apparatus of the present invention, include: with the light beam of the data surface that shines above-mentioned information recording carrier is the state that the pack state of regulation carries out focus control, be different a plurality of positions of the radial direction of above-mentioned information recording carrier, obtain the step (A) of the focus drive signal that when the above-mentioned data surface of above-mentioned light beam irradiates, obtains, with value based on above-mentioned a plurality of focus drive signals of obtaining, the step (B) of at least 1 calculating formula that decision is used for the shape of calculating above-mentioned data recording surface and use the calculating formula of above-mentioned decision, ask the tilt quantity of above-mentioned data recording surface, change the step (C) of the inclination of object lens based on the tilt quantity of trying to achieve.
In certain desirable embodiment, and then include: execution in step (B) back, with the state that carries out focus control, be above-mentioned information recording carrier radial direction the assigned position more than at least 1, obtain the step (D) of the focus drive signal that obtains when the above-mentioned data surface of above-mentioned light beam irradiates, with based on the value of the focus drive signal of obtaining in step (D) and step (A), upgrade the step (E) of aforementioned calculation formula and based on the calculating formula of upgrading, ask the tilt quantity of above-mentioned data recording surface, change the step (F) of the inclination of object lens based on the tilt quantity of trying to achieve.
In certain desirable embodiment, whenever arrive or by above-mentioned light beam in the position of the regulation more than at least 1 of the radial direction of above-mentioned information recording carrier one of them the time, execution above-mentioned steps (D)～(F).
In certain desirable embodiment, what produce when detecting the write error that produces or being reproduced in the data that write down on the above-mentioned data surface when above-mentioned data surface identifying recording layer reads in error, based on testing result, carries out above-mentioned steps (D)～(F).
In certain desirable embodiment, the amount of the data above-mentioned information recording carrier is carried out above-mentioned steps (D)～(F) based on data of reproducing from above-mentioned information recording carrier and the temporary transient put of difference.
In certain desirable embodiment, detect the temperature in the above-mentioned optical disc apparatus, be that setting is carried out above-mentioned steps (D)～(F) when above in variation of temperature.
In certain desirable embodiment, in above-mentioned steps (A) with obtain the position of focus drive signal (D), than the middle perimembranous of above-mentioned information recording carrier, in its peripheral part configuration De Gengmi.
In certain desirable embodiment, the aforementioned calculation formula contains polygronal function.
In certain desirable embodiment, in above-mentioned steps (D), one of them obtains above-mentioned focus drive signal at above-mentioned assigned position more than at least 1, based on the above-mentioned focus drive signal of in step (D), obtaining, revise the above-mentioned focus drive signal of in step (A), obtaining fully, carry out above-mentioned steps (E) based on the focus drive signal of revising.
In certain desirable embodiment, above-mentioned information recording carrier carry out 1 integral multiple during the rotation during obtain above-mentioned focus drive signal, use its mean value as the value of focus drive signal.
The recording medium of embodied on computer readable of the present invention is recorded in the program that is executed in each step of stipulating in above-mentioned one of them described method in the computing machine.
In addition, the present invention also provides such optical disc apparatus:
A kind of optical disc apparatus, it has: the whirligig of rotary information recording medium, light source to the data surface illumination beam of described information recording carrier, the bunching system of the described light beam of pack, detect the focusing-error detecting device that staggers between the focus of described data surface and the light beam by described bunching system pack, the first focus direction mobile device that one end of described bunching system is moved to the direction vertical with described data surface, the second focus direction mobile device that the other end of described bunching system is moved to the direction vertical with described data surface, on described data surface, to make the mode of described light beam with the state pack of regulation, the focus control device that drives to equidirectional based on the output of described focusing-error detecting device and with the described first focus direction mobile device and the described second focus direction mobile device, the tracking direction mobile device that described light source is moved on the radial direction of described information recording carrier, try to achieve respectively on different 2 of described radial direction integral multiple during described information recording carrier rotated for 1 week during the mean value of output of the described focus control device that obtains, and based on described 2 different mean value, obtain the inclination calculation element of the inclination of described data surface, according to the output of described inclination calculation element, the incline controller that the described first focus direction mobile device and the described second focus direction mobile device are driven round about and described bunching system is tilted diametrically.
Preferably, described whirligig makes described information recording carrier rotation, so that compare when being positioned at all sides of described information recording carrier with described light source, the rotational speed of described information recording carrier is little when described light source is positioned at the outer circumferential side of described information recording carrier, compare when being positioned at all sides of described information recording carrier with described light source, the value of described integral multiple is little when described light source is positioned at the outer circumferential side of described information recording carrier.
Preferably, also have the drive level device for detecting difference, this drive level device for detecting difference detects the motivation value of described first focus direction mobile device and the described second focus direction mobile device, and exports detected each motivation value,
Described incline controller is according to the output of described inclination calculation element so that the output of described drive level device for detecting difference become regulation value mode and described first focus direction mobile device and the described second focus direction mobile device are driven round about.
Preferably, described incline controller is so that the described drive level device for detecting difference of the state that described first focus direction mobile device and the described second focus direction mobile device stop to be output as reference level.
Preferably, described reference level is upgraded at interval with official hour.
Preferably, also be provided with temperature sensor, change to when the output of described temperature sensor under the situation more than the value of regulation, upgrade described reference level.
Description of drawings
Fig. 1 (a) is when dish does not have run-off the straight, and expression projects to the cross section of the light beam on the data surface of dish, (b) is when the dish run-off the straight, and expression projects to the cross section of the light beam on the data surface of dish.
Fig. 2 (a) and (b) be at dish during run-off the straight, the tilt quantity of indicating panel and reproducing signal beats and the figure of the relation of error rate respectively.
Fig. 3 is the calcspar of expression according to the formation of the optical disc apparatus of conventional art.
Fig. 4 (a) be expression during run-off the straight object lens 4 and with the mode chart of the relative position of the data surface of CD 2, (b) be the position and and the mode chart of the relation between the focus drive signal value of its position of expression shaven head.
Fig. 5 is the calcspar of the 1st embodiment of expression optical disc apparatus of the present invention.
Fig. 6 is the vertical view that is illustrated in the executive component of optical disc apparatus shown in Figure 5.
Fig. 7 is the calcspar that is illustrated in the drive current portion of optical disc apparatus shown in Figure 5.
Fig. 8 represents focus drive signal and rotates the waveform of 1 ring signal.
Fig. 9 is the calcspar of the 2nd embodiment of expression optical disc apparatus of the present invention.
Figure 10 is the vertical view that is illustrated in the executive component of optical disc apparatus shown in Figure 9.
Figure 11 is the calcspar of the 3rd embodiment of expression optical disc apparatus of the present invention.
Figure 12 is the calcspar of the 4th embodiment of expression optical disc apparatus of the present invention.
Figure 13 is the calcspar of the 5th embodiment of expression optical disc apparatus of the present invention.
Figure 14 is the mode chart of the shape of expression CD.
Figure 15 is the mode chart of expression optical disc shapes and its approximate function.
Figure 16 is the figure that is illustrated in initial detecting and replenishes the position of the check point that detects.
Figure 17 is the process flow diagram of the order of expression initial detecting.
Figure 18 is the process flow diagram that expression replenishes the order that detects.
Figure 19 is the figure of position of check point that is illustrated in the variation of the 1st embodiment.
Figure 20 is the figure of expression warping function.
The figure of Figure 21 inclination approximate value that to be expression obtain from the function of Figure 19.
Figure 22 is the process flow diagram that expression replenishes the order that detects.
Figure 23 is the calcspar of the 6th embodiment of expression optical disc apparatus of the present invention.
Figure 24 is the process flow diagram that expression replenishes the order that detects.
Figure 25 is the process flow diagram that expression replenishes other orders that detect.
Figure 26 is the process flow diagram that expression replenishes other orders that detect.
Figure 27 is the calcspar of the 7th embodiment of expression optical disc apparatus of the present invention.
Figure 28 is the figure that changes the time of reading the data volume in the memory buffer in the expression reproducing movement.
Figure 29 is the figure that changes the time of writing the data volume in the memory buffer in the expression operation of recording.
Figure 30 is the process flow diagram that expression replenishes the order that detects.
Figure 31 is the mode chart of the warpage state of indicating panel.
Figure 32 is the mode chart of the expression warping function and the relation of the dish warped shapes of reality.
Figure 33 is the figure that changes the time of reading the data volume in the memory buffer in the expression reproducing movement.
Figure 34 is the figure that changes the time of writing the data volume in the memory buffer in the expression operation of recording.
Figure 35 is when representing reproduction and the figure of the difference in the time interval of the warping function renewal of record.
Among the figure: 1, the 42-light source, 2, the 100-CD, 3, the 110-beam splitter, 4, the 103-object lens, 5,43, the 113-detecting device, 6,106-focuses on executive component, 7,115-focus error signal generating unit (FE signal generating unit), 8,9-focus control portion, the 10-inclination sensor, 11-inclination executive component, 12, the 114-shaven head, 13-tilt signals generating unit, 14-inclination control part, 15a, 15b-focuses on executive component, 16a, 125-the 1st focuses on drive division, 16b, 126-the 2nd focuses on drive division, 17-shaven head transfer shaft, 18,118-transfers motor, 19-scrambler, 20-direct motor drive portion, 21,130-microprocessor (microcomputer), the 22-focus memory, 23,120,122,123-subtraction portion, 24, the 124-addition operation division, 25, the 102-motor control part, 26,131-rotates test section, 27, the 101-motor, 28-EEPROM, 29-addition enlarging section, 30-equalizer (EQ), 31-data limiter, 32-PLL portion (PLL), the 33-demodulation section, 34-ID reading part, 35-mistake are corrected portion (ECC), and 36-simulates address counter, 37-reads memory buffer, the 38-principal computer, 39-writes memory buffer, the 40-modulation portion, 41-laser diode drive division (LD drive division), the 105-completely reflecting mirror, 106-light beam, 107-1/4 wavelength plate, the 108-coupled lens, 109-laser, 111-detects lens, 112-cylindrical lens, 116,121-phase compensation portion, 127,128-drive current test section, 135-the 1st focuses on and uses coil, and 136-the 2nd focuses on and uses coil.
Embodiment
For the inclination of the beam axis of optical disc data face, can divide into the radial direction of CD and the circumferencial direction of CD.Influence by the inclination of circumferencial direction wherein brings generally constitutes the reproducing signal treatment circuit by signal Processing with removing.In the present invention, dispose the inclination of the radial direction of CD.Below, in the present patent application book, the inclination (inclination of footpath direction) of the radial direction of CD is called to tilt or the pitch angle simply.
At first the detection as the pitch angle of the focus drive signal of the technology of common utilization is used in explanation in an embodiment of the present invention.The mode chart of the relative position of the object lens 4 when Fig. 4 (a) is the expression run-off the straight and the data surface of CD 2, Fig. 4 (b) are the position of expression shaven head and the mode chart of the relation between the focus drive signal value of its position.As reference Fig. 3 explanation, in optical disc apparatus, on the data surface of CD 2, drive the focusing executive component by the pack state that makes light beam always be regulation, carry out focus control.Thereby when carrying out focus control, the distance of the data surface of CD 2 and object lens 4 has nothing to do with radial location and is constant (L).When CD 2 tilted, because the position change of corresponding its object lens 4, the difference in the position of the object lens 4 of radial location d1 and d2 was Zr.
This Zr equates with poor Zd at the height of the data surface of the radial location d1 of CD 2 and d2.Because with respect to the cant angle theta d of surface level of dish, the angle θ r that becomes with surface level with the line of the position of the object lens 4 that are connected radial location d1 and d2 equates, can obtain the inclination of the data surface of CD 2 by following formula (1) from the poor R of Zr and radial location d1 and d2.
θd＝θr＝tan -1(Zr/R) (1)
In addition, the relation of displacement that focuses on the focus drive signal value of driving input of executive component and object lens 4 as control is because known in advance, and the position of the focus direction of object lens 4 can be obtained from the focus drive signal value.Here, making the pass between the addendum modification of focus direction of focus drive signal value and object lens 4 is pf, is Vs in the difference of the focus drive signal value of radial location d1 and d2, and according to formula (1), θ d is represented by following formula (2).
θd＝tan -1(Pf×Vs/R) (2)
For example the inclination that produces owing to the CD 2 at CD or DVD is about 1 degree, does not also almost have error even θ d is similar to like that as shown in the formula (3).
As more than, for the variation of the focus drive signal value of radial location, with roughly of equal value for being changed to of the amount of warpage of the data surface of radial direction.Therefore, utilize this relation, the focus drive signal value of the radial location by detecting each regulation can detect pitch angle radially.
In following embodiment, calculate radially inclination from this focus drive signal value (signal), use its result of calculation explanation the tilt optical disc apparatus and the control method of control.Particularly the 1st to the 4th embodiment mainly is the control method about light beam, and the 5th to the 7th embodiment mainly is about the method based on the tilt correction at the pitch angle of the tilt detection of optical disc data face and detection.
(the 1st embodiment)
Fig. 5 is the calcspar of expression according to the 1st embodiment of optical disc apparatus of the present invention.In optical disc apparatus 801, CD 100 is installed on the motor 101 corresponding to whirligig, with the rotation number rotation of regulation.Motor 101 is by the Be Controlled corresponding to the motor control part 102 of rotating control assembly.The rotation number of motor 101 is set by microcomputer 130 (below be designated as microcomputer 130).Rotation test section 131 is just exported pulse during 1 rotation of motor 101 every dos.Below this signal is designated as 1 rotating signal (PG).1 rotating signal is sent to microcomputer 130.
CD 100 has the substrate of specific thickness, to the data surface illumination beam as the one side of substrate.At data surface, form by the concavo-convex spiral helicine magnetic track that forms.At shaven head 114, be equipped with: object lens 103, the laser 109 for the light source of outgoing beam, coupled lens 108, beam splitter 110,1/4 wavelength plate 107, completely reflecting mirror 105, detect lens 111, cylindrical lens 112, detecting device 113, executive component 104.
Transfer motor 118, the function as the tracking direction mobile device is arranged, shaven head 114 radial directions to CD 100 (direction about among the figure) are moved.Transfer motor 118 by microcomputer 130 controls.
After the light beam 106 that sends from laser 109 becomes directional light by coupled lens 108,, reflected, shine on the data surface of CD 100 by object lens 103 packs by completely reflecting mirror 105 by beam splitter 110,1/4 wavelength plate 107.
The reflected light of the data surface reflection by CD 100, at object lens 103 by being reflected by completely reflecting mirror 105, pass through at 1/4 wavelength plate 107, beam splitter 110, detection lens 111 and cylindrical lens 112, incide by on the detecting device 113 that is constituted by the light reception element of a plurality of cutting apart (being 4 in the present embodiment).Object lens 103 are installed on the movable part (below be designated as lens carrier) of executive component 104.Executive component 104 contains the 1st focusing uses coil 135 and the 2nd to focus on coil the 136, the 1st focusing permanet magnet (not shown) and the 2nd focusing permanet magnet (not shown).Executive component 104 and the 1st focuses on coil 135 and executive component 104 and the 2nd focusing has function as the 1st focus direction control device and the 2nd focus direction control device respectively with coil 136.The 1st focus direction control device and the 2nd focus direction control device have the function as the focus direction mobile device.
The 1st focuses on coil 135 and the 2nd focusing coil 136, is installed in the fixed part of executive component 104.In addition, the 1st focusing focuses on permanet magnet and the 2nd and uses permanet magnet, is installed on the lens carrier respectively.
The 1st focuses on coil 135 and the 2nd focusing coil 136, clamps the radial direction that object lens 103 are configured in CD 100.In addition, in Fig. 5, owing to correctly illustrate difficulty, the 1st focusing focuses on coil 135 and the 2nd uses coil 136 for object lens 103, is illustrated in to be positioned at one-sided position.
The 1st focusing at executive component 104 focuses on drive division 126 with coil 136 uses as the 1st focusing drive division 125 of the 1st drive unit with as the 2nd of the 2nd drive unit with coil 135 and the 2nd focusing, when applying equal voltage, use coil 135 and the 2nd to focus on the big or small together electric current of moving phase in the coil 136 in the 1st focusing, the 1st focusing focuses on coil 135 and the 2nd and uses the equal magnetic flux of coil 136 generations.The magnetic flux separately that produces focuses on permanet magnet the 1st and gives identical influence with the 2nd magnetic flux that focuses on permanet magnet.Thus, object lens 103 move to the direction vertical with the data surface of CD 100 (above-below direction among the figure), below, this direction is called focus direction.
The 1st focusing at executive component 104 uses the 1st focusing drive division 125 and the 2nd to focus on drive division 126 with coil 135 and the 2nd focusing with coil 136, when applying different voltage, make the 1st focus on coil 135 and the 2nd focus on drive current with coil 136 produce poor, to focus on the magnetic flux that produces with coil 135 and the 2nd focusing in the 1st and dissimilate with the influence that the magnetic flux of permanet magnet gives with the corresponding focusing of the magnetic flux of coil 136 generations.Therefore, at the radial direction of CD, the inboard of object lens 103 is different with the addendum modification of the focus direction in the outside.Its result, object lens 103 tilt to the radial direction of CD 100.With respect to the optical axis of light beam 106, when the radial direction of the optical axis direction CD 100 of object lens 103 tilts, produce coma aberration at radial direction.In addition, CD 100 when radial direction tilts, produces coma aberration at radial direction with respect to the optical axis of light beam 106.
Like this, it is poor with the drive current of coil 136 to focus on coil 135 and the 2nd focusing the 1st, tilts to radial direction by making object lens 103, can offset by CD 100 and produce coma aberration when radial direction tilts.That is,, correspondingly with it also can guarantee the reproducing characteristic and the recording characteristic of good data by inclination object lens 103 reduction coma aberrations even CD 100 tilts.
Detecting device 113 is formed by 4 light reception elements.From the reflected light that the CD that incides on the detecting device 113 comes out, be sent to focus error signal generating unit 115 (below be designated as FE signal generating unit 115).FE signal generating unit 115 as focusing-error detecting device, generates the focus error signal (below be designated as the FE signal) of the dislocation between the data surface of the focus of expression light beam 106 and CD 100.
Optical system shown in Figure 5 constitutes the detection mode of the FE signal that is commonly referred to as Astigmatism methord.The FE signal is sent to phase compensation portion 116.Phase compensation portion 116 is the filtrators that advance the phase place of stablizing the focus control system.Focus drive signal as the output of phase compensation portion 116 is sent to microcomputer 130.In addition, the side by addition operation division 124+terminal and subtraction portion 123+terminal, be sent to the 2nd respectively and focus on drive division 126 and the 1st and focus on drive division 125.
Addition operation division 124 output additive operations each+value of the signal of terminal input.Subtraction portion 123, output from be input to+the signal subtraction computing of terminal is input to-value of the signal of terminal.
By backfeed loop according to Astigmatism methord, focus on coil 135 and the 2nd focusing mobile respectively same current of coil 136 ground the 1st, the 1st focuses on drive division 125 and the 2nd focusing drive division 126 output voltages.
In addition, drive current test section 127, drive current test section 128 detect respectively the 1st and focus on coil the 135, the 2nd focusing amount of drive current that flows in the coil 136.Phase compensation portion the 116, the 1st focusing drive division 125 and the 2nd focusing drive division 126 have the function as focus control device, because the electric current of the FE signal that staggers between the data surface for the focus of representing light beam 106 and CD 100 equally is flowing in the 1st focusing and focuses on in the coil 136 with coil 135 and the 2nd, the focus of light beam 106 always is positioned at the data surface ground of CD 100, is controlled by object lens 103.
Drive current test section 127 and drive current test section 128 detect to focus on coil 135 and the 2nd the 1st and focus on the drive current that flows with in the coil 136, deliver to subtraction portion 120+terminal, a side-terminal (being expressed as the terminal of " 1 " among the figure).The opposite side of subtraction portion 120-terminal (being expressed as the terminal of " 2 " among the figure), be connected on the microcomputer 130.Subtraction portion 120, output is from the input signal values of the 2-terminal of input signal subtraction of+terminal.Thereby, from microcomputer 130 input-when the input signal of terminal was zero, the output of subtraction portion 120 was illustrated in the 1st and focuses on coil 135 and the 2nd and focus on poor with the drive current that flows in the coil 136.This signal remembered below do the drive current difference signal.In addition, relevant microcomputer 130 signal that is set in subtraction portion 120-terminal is narrated in the back.The drive current difference signal, be sent to subtraction portion 122-terminal.Drive current test section 127, drive current test section 128 and subtraction portion 120 have the function as the device of the drive level difference of the inclination that detects the control object lens.
Microcomputer 130 from difference and its interval of 2 of the output of 2 phase compensation portion 116 of the different radial direction of CD 100, detects the pitch angle into the inclination of the radial direction of CD 100.Moving by transferring motor 118 of radial direction to shaven head 114 undertaken.
The tilt quantity of object lens 103 (pitch angle), by microcomputer 130 be set in subtraction portion 122+the terminal place.
The output of subtraction portion 122, by phase compensation portion 121 be sent to subtraction portion 123-side of terminal and addition operation division 124+the terminal place.The output of phase compensation portion 121, by be sent to subtraction portion 123-terminal and addition operation division 124+the terminal place, make the 1st focus on coil 135 and the 2nd focus on drive current with coil 136 produce poor.
Thereby, the level of drive current difference signal, by microcomputer 130 be controlled to be be set in subtraction portion 120+level of terminal equates.Thus, object lens 103 are the inclination that response is set in the level of subtraction portion 122+terminal by microcomputer 130.That is, the inclination of object lens 103 response CDs 100 and Be Controlled.Phase compensation portion 121 is the stable phase compensation filtrators of control system that make driving current signal.Like this, phase compensation portion 121, subtraction portion 122, subtraction portion 123, addition operation division 124 and microcomputer 130 have the function of the control device of the inclination of controlling object lens.
In addition, drive current test section 127 focuses on the formation that drive division 125 is opened with coil 135 electric dialysis from the 1st focusing for making the 1st.In addition, similarly the drive current test section 128, focus on the formation that drive division 126 is opened with coil 136 electric dialysis from the 2nd focusing for making the 2nd.By the terminal c that makes drive current test section 127,128 is high level, can set the state that its electric dialysis is opened.
The output of the subtraction portion 120 of the state of opening in this electricity dialysis, the circuit skew of expression drive current test section 127,128 and subtraction portion 120.In addition, microcomputer 130 to subtraction portion 120-signal of terminal input, be set at zero level.Details are narrated in the back.
Microcomputer 130 is the output that the state of high level is taken into subtraction portion 120 at the terminal c that makes drive current test section 127, drive current test section 128, is zero in order to make the value that is taken into, adjust to subtraction portion 120-level of the signal of terminal input.Thereby the skew of drive current difference signal is removed.
Below, describe the action of each calcspar in detail.Fig. 6 be to the executive component 104 of optical disc apparatus 801 from vertical view.Focusing is connected in series with coil b203 with coil a201 and focusing, constitutes the 1st and focuses on coil 135.Focusing is connected in series with coil d205 with coil c204 and focusing, constitutes the 2nd and focuses on coil 136.Clamp object lens 103, use coil 135 and the 2nd to focus on coil 136 in radial direction (above-below direction among the figure) configuration the 1st focusing of dish.
The fixing lens carrier 200 of object lens 103 is connected to the fixed part (not having diagram) of shaven head 114 by lead 180.In addition, the 1st focus on the fixed part that also is installed in shaven head 114 with coil 135 and the 2nd focusing with coil 136.The 1st focuses on permanet magnet 201 and the 2nd focusing permanet magnet 206, is installed on the lens carrier 200.
Make the 1st to focus on the drive current of coil 135 and focusing on when flowing, focus on the magnetic flux that produces with coil 135 and be reverse by the 2nd direction that focuses on the magnetic flux that produces with coil 136 the 1st with the opposite direction of the drive current of coil 136 with the 2nd.Thereby the 1st to focus on the direction that influence and the 2nd that the magnetic flux with permanet magnet 201 is subjected to focuses on the influence that the magnetic flux with permanet magnet 206 is subjected to be reverse.In order to make the data surface of lens carrier 200 near CD 100, focus on the drive current that flows in the coil 135 the 1st, for the data surface from CD 100 keeps away, when in the 2nd focusing usefulness coil 136, flowing drive current, near the data surface of CD 100, the outer circumferential side of lens carrier 200 leaves from the data surface of CD 100 interior all sides of lens carrier 200 (disposing the 1st side that focuses on coil 135).Promptly, the optical axis direction outer circumferential side of object lens 103 tilts.
In addition, for the data surface of lens carrier 200 from CD 100 keeps away, focus on the drive current that flows in the coil 135 the 1st, for data surface near CD 100, when in the 2nd focusing usefulness coil 136, flowing drive current, interior all sides of lens carrier 200 (disposing the 1st side that focuses on coil 135) keep away from the data surface of CD 100, and the outer circumferential side of lens carrier 200 is near the data surface of CD 100.Promptly, all inclinations are oblique in the optical axis direction of object lens 103.
When making the 1st to focus on drive current and the 2nd with coil 135 to focus on direction with the drive current of coil 136 be identical, the 1st focus on the magnetic flux of coil 135 generations be identical by the 2nd focusing with the direction of the magnetic flux of coil 136 generations.Thereby for identical, lens carrier 200 does not move to focus direction the direction of the influence that the magnetic flux of influence that the magnetic flux of the 1st permanet magnet 201 is subjected to and the 2nd permanet magnet 206 is subjected to obliquely yet.That is, make the 1st to focus on coil 135 and the 2nd and focus on when driving with same-phase respectively with coil 136, object lens 103 move inclination when driving with antiphase to focus direction.
Making as focus on coil 135 and the 2nd focusing for the 1st of the output of the subtraction portion 120 of the inclination of object lens 103 here, is Pt with the pass of the difference of the drive current of coil 136.Make object lens 103 only during cant angle theta r, subtraction portion 120+the terminal place sets the value by the Y of formula (4) expression.
Y＝θr×Pt (4)
Thus, subtraction portion 122+terminal and-level of terminal is for equating.Thereby the inclination of object lens 103 is Ur.Below, the action of drive current test section 127 and 128 is described.
Fig. 7 is the calcspar of the formation of expression drive current test section 127.One side of terminal 250 connection subtraction portions 120-terminal, terminal 251 connects the 1st and focuses on drive division 125, and terminal 252 connects the 1st focusing coil 135, and terminal 253 connects microcomputers 130.In a word, terminal 250 is equivalent to the terminal d of drive current test section 127 shown in Figure 5.Equally, terminal 251 corresponding terminal b, terminal 252 corresponding terminal a, terminal 253 corresponding terminal c.
Switch 256,257,258 for example to the signal of separately terminal c input high level the time, is the formation of cutting out.Counter-rotating portion 259 is counter-rotating incoming level and the digital circuit exported.
Focus on drive division 125 by the 1st and focus on in the coil 135 during streaming current the 1st, on resistance 255 also moving phase with the electric current of size.Descend in the two ends of resistance 255 generation voltage difference by voltage.The terminal a of resistance 255 is connected on the terminal a of switch 257, and the terminal b of resistance 255 is connected on the terminal a of switch 258.The terminal a of switch 256 is connected on subtraction portion 254-terminal, the terminal b of switch 256 be connected to subtraction portion 254+terminal on.The value that subtraction portion 254 will get from the incoming level of the incoming level subtraction-terminal of+terminal outputs on the terminal 250.
Usually, terminal 253 is set at low level by microcomputer 130.Thereby switch 256 is opened, and switch 257,258 cuts out.Thus, to subtraction portion 254+terminal send the signal of the terminal a of resistance 255, to subtraction portion 254-terminal send the signal of the terminal b of resistance 255.The output of subtraction portion 254, the level that the voltage of expression resistance 255 descends.That is, being illustrated in the 1st focuses on value of current flowing in the coil 135.
The formation of drive current test section 128 also is identical with the formation of drive current test section 127.Thus, the output of drive current test section 128 is illustrated in the 2nd focusing value of current flowing in the coil 136.
Thereby, terminal 253 (or terminal c of drive current test section 127,128) by microcomputer 130 drive current test sections is when being low level, the output of subtraction portion 120 is illustrated in the 1st and focuses on coil 135 and the 2nd and focus on poor with value of current flowing in the coil 136.
Below, the action of terminal 253 (or terminal c of drive current test section 127,128) when being set at high level by microcomputer 130 drive current test sections is described.The terminal c of switch 256 was a high level when terminal 253 was high level, and switch 256 cuts out.In addition, the terminal c of switch 257,258 is that low level switch 257,258 is opened.Thereby, connect subtraction portion 254+terminal and-terminal.That is, the input difference of subtraction portion 254 is zero.At this moment, the output of subtraction portion 254 is illustrated in the skew of the output signal of the subtraction portion 254 when the 1st focusing is zero with coil 135 mobile drive currents.
The action of drive current test section 128 is also same with drive current test section 127.Thus, the skew of the output signal of drive current test section 128 is represented in the output of drive current test section 128.
Thereby, terminal 253 (or terminal c of drive current test section 127,128) by microcomputer 130 drive current test sections 127,128 is when being high level, the output of subtraction portion 120 is the signal from the skew of the output signal of the skew subtraction drive current test section 127 of the output signal of drive current test section 128.
Represent the signal of skew of the detection system of this drive current difference signal, be sent to microcomputer 130.Microcomputer 130, with this off-set value be set in subtraction portion 120-terminal on.Thereby, even the output signal of skew drive current test section 127 and drive current test section 128, the 1st focus on coil 135 and the 2nd focus on the difference of the drive current of coil 136 by correctly be controlled to be respond be set in subtraction portion 122+magnitude of voltage of terminal poor.
The mensuration of the skew of the detection system of this drive current difference signal if the timer by microcomputer 130 band is for carrying out constituting with the interval of regulation, also can be carried out corresponding its control even skew is done temporal variation by all major reasons.In addition, usually the skew of circuit is changed by the temperature of circuit.Therefore, the temperature in the monitoring optical disc apparatus 801 based on its temperature, also can be carried out the mensuration of skew of the detection system of drive current difference signal.Particularly, as shown in Figure 5, both are arranged in the optical disc apparatus 801 to the A/D translation circuit 186 of microcomputer 130 inputs in the output that makes temperature sensor 185 and A/D transformation temperature sensor 185, change to time more than the setting with its output and adjust (time of changing of the temperature range of regulation is adjusted in a word), measure the skew of the detection system of drive current difference signal.According to such formation,, also can carry out the control corresponding with it even the temperature variation that is offset by circuit changes in time.
In addition,, open and switch 256 closing state are carried out, but carry out also passable to stop the 1st state that focuses on the action of drive division 125 with switch 257,258 to the skew of drive current test section 127.Be because the electric current that the 1st action that focuses on drive division 125 is flowed in the 1st focuses on coil 135 when stopping is zero.At this moment drive current test section 128 and the 2nd focuses on drive division 126 and also does setting similarly.
Below, the action of detection as the microcomputer 130 at the pitch angle of the inclination of the radial direction of dish 100 is described.As reference Fig. 4 explanatorily, the cant angle theta d of CD 100, to be Pf with respect to the contextual definition of the addendum modification of the focus direction of the object lens 103 of the variation of the output of phase compensation portion 116, to be defined as Vs in the difference of the output level of the phase compensation portion 116 of radial location d1 and d2, when the distance of radial location d1 and d2 is corresponded to R, represent by formula (3).
θd＝Pf×Vs/R (3)
Thereby, from formula (3) and formula (4), subtraction portion 122+the cant angle theta o of object lens 103 when terminal is set the voltage Ys of formula (5), be θ d as the formula (6).
Ys＝Pf×Vs×Pt/R (5)
θo＝Ys/Pt
＝Pf×Vs×Pt/(R×Pt)
＝θd (6)
Use Fig. 8 explanation by the action of asking the position of object lens 103 from the focus drive signal of phase compensation portion 116 outputs.In Fig. 8, the output of waveform (a) expression phase compensation portion 116, waveform (b) expression is from the signal that rotates a circle of rotation test section 131 outputs.Owing to usually end tank wobble is arranged at CD 100, respond it, object lens 103 are in the focus direction displacement.Thereby, shown in waveform (a), spiral circle during the output change of phase compensation portion 116.The frequency of change, more than the gyro frequency for CD 100, and, since with the signal Synchronization that rotates a circle, can correctly remove the variance components of the end tank wobble etc. of dish by the output of the time T average phase compensation section 116 that rotates a circle at CD 100.That is, only can correctly detect the DC composition.In addition, owing to finish mensuration and can shorten minute in the time that CD 100 rotates a circle.
Microcomputer 130, based on the signal that rotates a circle stride across time T during integration as the focus drive signal of the output of phase compensation portion 116, detect V by make division arithmetic with time T as the DC composition.
As above-mentioned, the 1st focuses on drive division 125 and the 2nd focuses on the amplification factor of drive division 126 because known in advance can calculating in the 1st focusing uses coil 135 and the 2nd to focus on value of current flowing in the coil 136.In addition, because also known in advance measuring the V average height of object lens 103 as can be known with respect to the relation of the addendum modification of the object lens 103 of the variation of drive current.
Microcomputer 130 makes shaven head 114 move the difference in height of asking at 2 object lens 103 to radial direction, asks the inclination of CD 100 based on the distance of 2 radial directions.And, the inclination of the CD 100 that response detects, by set subtraction portion 122+the level inclination object lens 103 of terminal.
In the device of reality, the above-mentioned Pf value of each executive component is discrete.Just action at this moment describes.The Pf of the executive component of standard is being remembered in the device of reality, the calculating of the inclination of being coiled by this value.Here, the value of actual executive component relatively is decided to be low Pfd with Pf.In addition, will be defined as Zs, the difference of the output of phase compensation portion 116 will be defined as Vsd in the difference of the position of the object lens 103 of radial location d1 and d2.In addition, the inclination of Shi Ji dish is defined as θ r.Vsd uses the relation of formula (3) to be represented by formula (7).
Vsd＝Zs/Pfd (7)
Thus, the cant angle theta sd of the dish of detection is represented by formula (8) from formula (3).
θsd＝Pf×Vsd/R
＝Pf×Zs/(R×Pfd) (8)
Thus, by formula (4) and formula (8), the Ysd of formula (9) be set at subtraction portion 122+the terminal place.
Ysd＝Pf×Zs×Pt/(R×Pfd) (9)
Here, as with respect to the variable quantity of the difference of the drive current of the output of the subtraction portion 120 of the inclination of object lens 103 concern Pt also since executive component disperse.Yet in executive component 104, the drive system of focus direction and the drive system of inclination realize by same composed component.If with respect to the sensitivity step-down of the displacement of the focus direction of drive current, pro rata, the sensitivity of inclination just descends.Because, being Pt as contextual definition with respect to the variable quantity of the difference of the drive current of the output of the subtraction portion 120 of the variation of the inclination of object lens 103, is the contextual definition with respect to the addendum modification of the focus direction of the object lens 103 of the variation of the output of phase compensation portion 116 Pf, if Pf reduces, Pt increases inversely.When the executive component as imagination was Ptd for the contextual definition of the variable quantity of the difference of the drive current of the output of the subtraction portion 120 of the variation of the inclination of object lens 103, Ptd was formula (10).
Ptd＝Pf×Pt/Pfd (10)
The cant angle theta od of the reality of object lens 103 by formula (4), formula (9) and (10), obtains following formula (11).
θod＝Ysd/Ptd
＝Pf×Zs×Pt/(R×Pfd×Pyd)
＝Pf×Zs×Pt×Pfd/(R×Pfd×Pf×Pt)
＝Zs/R
＝Ur (11)
As the formula (11), even each executive component Pf is different with Pt, the inclination of CD 100 also is θ r.That is, the inclination of object lens 103 can be correctly controlled in the inclination of response CD 100.
Like this,,, obtain focus drive signal, the signal of obtaining during striding across on average respectively that CD 100 rotates a circle by focus control at the 2 different points of the radial direction of CD 100 according to present embodiment.By average focus drive signal value, the influence of the end tank wobble of CD is removed.The focus drive signal value that 2 quilts are average poor is because poor corresponding at the height of 2 object lens 103 based on the distance of 2 radial directions, tried to achieve the inclination of CD 100.Based on the inclination of trying to achieve, by driving executive component 104, make the object lens can be consistent with the inclination of CD 100, light beam can vertically be shone with respect to CD 100.Thus, can realize correctly to carry out the record of data, the optical disc apparatus of reproduction.
In addition, the new element that does not need the inclination of objective lens.Therefore, can not produce owing to use new element, and cost rises, the adjustment when increasing assembling increases the problem of the main cause and so on of regular error.And then, can make bare headed miniaturization.
At present embodiment, the focusing executive component that uses for the inclination of asking CD 100 uses as the executive component that makes object lens inclining especially.Therefore, even focus on the influence that the temperature of executive component around being subjected to brought, owing to be subjected to same affect, and its influence is disappeared as the executive component that makes object lens inclining.In addition, focus on between the coil 136 with coil 135 and the 2nd in the 1st focusing that constitutes the focusing executive component, even produce as the driving poor sensitivity that focuses on executive component, when driving as making the executive component of object lens inclining, it drives poor sensitivity and is disappeared.
In addition, detect respectively by drive current test section 127 and drive current test section 128 and to focus on drive division 125 and the 2nd the 1st and focus on the drive current that drive division 136 flows, obtain driving current signal as these differences by subtraction portion 120.This driving current signal, the level of the signal that the inclination of corresponding CD 100 and object lens 103 are set with microcomputer obliquely is consistent, because control the 1st focuses on drive division 125 and the 2nd and focuses on drive division 136, there is skew also can correctly adjust the inclination of object lens even focus on drive division 136 at the 1st focusing drive division 125 and the 2nd.
In addition, microcomputer 130, be set at noble potential by terminal c, make the 1st focusing focus on drive division 125 and the 2nd and focus on, can open from the 120 electric dialysis of subtraction portion with coil 136 and the 2nd focusing drive division 136 with coil 135 and the 1st with drive current test section 127 and drive current test section.At this moment, from drive current test section 127 and drive current test section 128 signal, be illustrated in the skew of the output signal of drive current test section 127 when the 1st focuses on coil 135 and the 2nd that to focus on coil 136 mobile drive currents be zero and drive current test section 128 to 120 inputs of subtraction portion.
Thereby, be output as benchmark and control with the subtraction portion 120 of this moment, by microcomputer 130 this output valve is input to the negative terminal of subtraction portion 120, the skew of drive current test section 127 and drive current test section 128 is eliminated.
In addition, in the present embodiment, in microcomputer 130, asked CD 100 rotate a circle during the mean value of focus drive signal of phase compensation portion 116, seek only during output average of phase compensation portion 116, even CD 100 rotate a circle during the integral multiple more than 2, can obtain the effect identical with present embodiment.
In addition, it is constant usually making the linear velocity that is called as CLV, rotary CD 100, and when carrying out the record-playback of data, relatively interior week is little in the rotation number of the CD of periphery.Here, ask minute marquis when inner periphery and the outer periphery are limited in the regulation certain hour of mean value of the output of phase compensation portion 116, making the minute in interior week is the CD time in rotation n week, making the minute in periphery is the CD time in rotation m week, m below the n (all be zero above integer), determine m and n also can.By like this, in the minute that limits, can carry out more high-precision test.
(the 2nd embodiment)
Fig. 9 is the calcspar of the 2nd embodiment of expression optical disc apparatus of the present invention.In optical disc apparatus shown in Figure 9 802, same with the 1st embodiment, in identical inscape, give identical reference marks.
In optical disc apparatus 802, object lens 103 are installed in the movable part of executive component 309.Executive component 309 contains focusing coil 352, follows the tracks of with coil 351, tilts to use coil 350 and 4 permanet magnet (not shown).Focus on and use coil 352, follow the tracks of with coil 351, tilt with the corresponding focus direction mobile device of coil 350 difference, tracking direction mobile device, object lens inclining device.
Use when focusing on drive divisions 302 and applying voltage streaming current in coil, generation magnetic flux to focusing on coil 352.By focusing on the flux interaction that produces with coil 352 in the magnetic flux of permanet magnet, object lens 103 move to focus direction.Equally, use when following the tracks of drive divisions 306 and applying voltage streaming current in coil, generation magnetic flux to following the tracks of with coil 351.By following the tracks of the flux interaction that produces with coil 351, the radial direction of object lens 103 crosscut CDs 100, be that magnetic track ground (in the drawings to the left and right) on the CD 100 is mobile in the magnetic flux of permanet magnet.In addition, when using pitch drives portions 308 to apply voltage with coil 350 to inclination, object lens 103 tilt to the radial direction (left and right directions in the drawings) of CD 100, and in a word, focusing drive division 302, tracking drive division 306, pitch drives portion 308 have the function of drive unit respectively.
As the FE signal of the output of FE signal generating unit 115, be sent to by phase compensation portion 116, subtraction portion 301, switch 380 and focus on drive division 302.Focus on drive division 302, the electric current of response input signal is focused on coil 352 by drive current test section 310 flow directions as the drive level pick-up unit.Drive current test section 310 detects the electric current that flows with on the coil 352 focusing on.At this moment, the terminal a of switch 380 is in the state that is connected with terminal d.By such formation, object lens 103, the focus of control bundle 106 often is positioned on the data surface of CD 100.In a word, phase compensation portion 116 and focusing drive division 302 have the function as focus control device.In addition, phase compensation portion 116 has the function as focus control key element device.
Microcomputer 313, make the terminal b of switch 380 and terminal d tie-time Ts during, be taken into output at the drive current test section 310 of this state.The terminal b of switch 380, owing to be set in zero level, at the signal that focuses on drive division 302 input zero levels.Thereby in the output of the drive current test section 310 of this state, expression focuses on the skew of the output of drive division 302.In addition, the skew of the output of drive current test section 310 is zero.Below, this signal is designated as shifted signal.Microcomputer 313, with the shifted signal that is taken into send into subtraction portion 301-terminal.Thus, can eliminate focus on drive division 302 bias effect, the electric current of the output of response phase compensation section 116 is correctly focusing on flowing on the coil 352.That is, because for the outer skew of disturbing is eliminated, the control accuracy of focus control uprises.
Above-mentioned drive current test section 310 and focus on the mensuration of the skew of drive division 302, the state that stops in the action of focus control carries out.Time T s for example is decided to be below the 10 μ s, also can carries out at the state that makes the focus control action.
Microcomputer 313, identical with the 1st embodiment, from the difference of the output of 2 phase compensation portion 116 of the different radial direction of CD 100 and the inclination that the radial direction of CD 100 is detected at its interval of 2.Microcomputer 313 is tilting with flowing in the coil 350 by the electric current that makes the inclination that responds the dish that detects, and makes object lens 103 inclinations.For this reason microcomputer 313 with the current value of necessity be set in subtraction portion 307+terminal.Switch 382, as the drive current test section 314 of drive level pick-up unit and the formation and the action of pitch drives portion 308, be with switch 380, drive current test section 310 with to focus on drive division 302 identical.Thereby, can eliminate the influence of the skew of pitch drives portion 308, microcomputer 313 response be set in subtraction portion 307+electric current of the level of terminal correctly tilting with flowing in the coil 351.That is, the adjustment precision of the inclination of object lens 103 uprises.
Optical system shown in Figure 9 usually constitutes the detection mode of the tracking error signal that is known as the method for recommending.Below, tracking error signal is designated as the TE signal.As the TE signal generating unit 303 of tracking error detecting device, detect the departing from of magnetic track of output beam 106 and CD 100 by the method for recommending.The TE signal is sent to by phase compensation portion 304 and subtraction portion 305 and switch 381 and follows the tracks of drive division 306.Following the tracks of with coil 351 streaming currents by following the tracks of drive division 306.Thereby the focus of light beam 106 is controlled on the magnetic track of CD 100.Phase compensation portion 304 has the function as the controlling element device, and phase compensation portion 304 and tracking drive division 306 constitute follow-up control apparatus.
Microcomputer 313, will as the offset setting of the drive current test section 311 of following the tracks of drive division 306 and drive level pick-up unit subtraction portion 305-the terminal place.In addition, switch 381, drive current test section 311 and follow the tracks of the formation and the action of drive division 306 are with switch 380, drive current test section 310 and to focus on drive division 302 identical.Thereby, can eliminate the influence of the skew of following the tracks of drive division 306, the electric current of the output of response phase compensation section 304 is correctly being followed the tracks of with flowing in the coil 351.That is, the control accuracy of tracking Control uprises.
Below, be elaborated with regard to executive component 309.Figure 10 is in the optical disc apparatus of present embodiment, and the figure of the formation of executive component 309 is described, specifically the figure that executive component 309 is seen from above.The fixing lens carrier 401 of object lens 103 is connected to the fixed part (not having diagram) of shaven head 400 by lead 404.In addition, permanet magnet 402,403 is installed on the lens carrier 401.Executive component 309 have 4 focusing with coil 405a, 405b, 405c, 405d, 4 tracking with coil 406a, 406b, 406c, 406d, 4 inclinations with coil 407a, 407b, 407c, 407d.Each coil by on iron core, is installed in the fixed part of shaven head 400.In addition, form the ring of magnetic flux by iron core and the permanet magnet relative with each iron core.
Focus on coil 405a, 405b, 405c, 405d, be connected in series, constitute to focus on and use coil 352.On focusing on, use when focusing on drive division 302 and applying voltage streaming current in coil, the generation magnetic flux with coil 352.By focusing on the flux interaction that produces with coil 352 in the magnetic flux of permanet magnet, object lens 103 move to the focus direction of CD 100.
Equally, follow the tracks of, be connected in series, constitute and follow the tracks of with coil 351 with coil 406a, 406b, 406c, 406d.On following the tracks of, use when following the tracks of drive division 306 and applying voltage streaming current in coil, the generation magnetic flux with coil 351.By following the tracks of the flux interaction that produces with coil 351 in the magnetic flux of permanet magnet, the radial direction of object lens 103 crosscut CDs 100, be on the CD 100 magnetic track move.
Tilt with coil 407a, 407b, 407c, 407d, be connected in series, constitute and tilt with coil 350.The direction of magnetic flux that produces by coil 407a, 407b when using pitch drives portion 308 to apply voltage on tilting with coil 350 and the magnetic flux by coil 407c, 407d generation is connecting coil on the contrary.Thereby object lens 103 tilt to the radial direction of dish 100.
Above-mentioned focusing drive division 302, the mensuration of following the tracks of the skew of drive division 306, pitch drives portion 308 and drive current test section 310,311,314, the timer of being with by microcomputer 313 carries out with the interval of regulation.In addition, usually, the skew of circuit and since by the temperature variation of circuit as among the 1st embodiment explanatorily, temperature sensor is set, its output changes to setting when above, the action of mensuration of carrying out circuit skew is also passable.
Like this, according to present embodiment,, during regulation, be set at zero by the input that will focus on drive division 302, the shifted signal of drive current test section 310 output driving current test sections 310 by switch 380., make from phase compensation portion 116 and replenish in subtraction portion 301 as reference value with this shifted signal, in a word, eliminate skew to the DC level of the signal that focuses on drive division 302 inputs.Therefore, also can improve the precision of focus control even produce skew at focusing drive division 302.In addition, control the skew of eliminating similarly at each drive division, can improve each control accuracy in tracking Control and inclination.
(the 3rd embodiment)
Figure 11 is the calcspar of the 3rd embodiment of expression optical disc apparatus of the present invention.In optical disc apparatus shown in Figure 11 803, in identical inscape, give identical reference marks with the 2nd embodiment.
In optical disc apparatus 803,, sent to focusing on drive division 302 by phase compensation portion 116 and subtraction portion 500 as the FE signal of the output of FE signal generating unit 115.Focus on drive division 302, the electric current that responds input signal is focused on coil 352 by drive current test section 310 flow directions.Drive current test section 310 detects the electric current that flows with in the coil 352 focusing on.The output of drive current test section 310, to a side of microcomputer 506 and subtraction portion 500-terminal (terminal of expression " 1 " among the figure).At this moment the terminal a of switch 501 is the state that is connected with terminal d.In addition, by microcomputer 506 the opposing party of subtraction portion 500-terminal (terminal of expression " 2 " among the figure) is set at zero level.
Focusing on drive division 302, the output of the output of input phase compensation section 116 and drive current test section 310 poor.Thereby subtraction portion 500 is output as the relation of regulation and controls focusing coil 352 (being zero in the present embodiment).That is, the electric current of the output of response phase compensation section 116 is focusing on flowing in the coil 352.Thus, object lens 103, the focus of control bundle always is positioned on the data surface of CD 100.
Below with regard to microcomputer 506 be located at subtraction portion 500-the terminal terminal of (among the figure expression " 2 ") describes.Microcomputer 506 is opened the terminal a of switch 501 and terminal d during time T p, be taken into the output at the drive current test section 310 of this state.In the output of the drive current test section 310 of this state, the skew of the output of expression drive current test section 310.Microcomputer 506 with the offset level of the output of the drive current test section 310 that is taken into deliver to subtraction portion 500-terminal.Thereby, can eliminate the influence of the skew of drive current test section 310, the electric current of the output of response phase compensation section 116 is focusing on correctly flowing in the coil 352.That is, because the skew of eliminating as external disturbance improves the control accuracy of focus control.
In addition, the mensuration of the skew of above-mentioned drive current test section 310, the state that stops in the action of focus control carries out.If make time T p, also can carry out at the state that makes the focus control action for example for below several 10 μ s.
Microcomputer 506, identical with the 2nd embodiment, from the difference of the output of 2 phase compensation portion 116 of the different radial direction of CD 100 and the inclination that the radial direction of CD 100 is detected at its interval of 2.Tilting with flowing in the coil 350 by the electric current that makes the inclination that responds the dish that detects, making object lens 103 inclinations.Current value is set in subtraction portion 504+terminal.The formation and the action of subtraction portion 504, switch 505, drive current test section 314 and pitch drives portion 308, be with subtraction portion 500, switch 501, drive current test section 310 with to focus on drive division 302 identical.Thereby, can eliminate the influence of the skew of drive current test section 314, thus, microcomputer 506 to should be set in subtraction portion 504+electric current of the level of terminal correctly tilting with flowing in the coil 351.That is, the adjustment precision of the inclination of object lens 103 uprises.
The TE signal is sent to tracking drive division 306 by phase compensation portion and subtraction portion 502.Follow the tracks of drive division 306, make the electric current of response input signal flow to tracking coil 351 by drive current test section 311.Thereby the focus of light beam 106, Be Controlled are on the magnetic track of dish 100.
Microcomputer 506, the offset setting that makes drive current test section 311 subtraction portion 502-terminal (terminal of expression " 2 " among the figure) on.The formation and the action of subtraction portion 502, switch 503, drive current test section 306 and electric drive current test section 311, be with subtraction portion 500, switch 501, to focus on drive division 302 identical with drive current test section 310.Thereby, can eliminate the influence of the skew of following the tracks of drive division 306, the electric current of the output of response phase compensation section 304 is correctly being followed the tracks of with flowing in the coil 351.That is, the control accuracy of tracking Control uprises.
According to such present embodiment, open during regulation by making switch 501, stop to focus on the action of drive division 302.During this, the signal indication skew of drive current test section 310 outputs.Thereby, be benchmark with this skew, the output by making phase compensation portion 116 is replenished by subtraction portion 500, is eliminated from the skew of the output driving current test section 310 of phase compensation portion 116.Its result can improve the precision of focus control.In addition, in the tracking Control and the control of tilting, the skew of each drive current test section similarly is eliminated, and can improve each control accuracy.
(the 4th embodiment)
Figure 12 is the calcspar of the 4th embodiment of expression optical disc apparatus of the present invention.In optical disc apparatus shown in Figure 12 804, in the inscape identical, give identical reference marks with the 2nd embodiment.
In optical disc apparatus 804,, sent to focusing on drive division 302 by phase compensation portion 116 and subtraction portion 500 as the FE signal of the output of FE signal generating unit 115.Focus on drive division 302, the electric current that responds input signal is being focused on coil 352 by drive current test section 600 flow directions.As the drive current test section 600 of drive current pick-up unit, detect the electric current that flows with in the coil 352 focusing on.With the formation and the action of the drive current test section 127 that uses at the 1st embodiment is identical.The output of drive current test section 600, to a side of microcomputer 603 and subtraction portion 500-terminal (terminal of expression " 1 " among the figure) sends.By microcomputer 603 the opposing party of subtraction portion 500-terminal (terminal of expression " 2 " among the figure) is set at zero level.
Focusing on drive division 302, the output of the output of input phase compensation section 116 and drive current test section 600 poor.Thereby subtraction portion 500 is output as and controls the electric current that focuses on coil 352 zeroly.That is, the electric current of the output of response phase compensation section 116 is focusing on flowing in the coil 352.Thus, object lens 103 always are positioned on the data surface of CD 100 focus of light beam 106.
Below with regard to microcomputer 603 be set in subtraction portion 500-signal of terminal describes.Microcomputer 603 makes the terminal c of drive current test section 600 be noble potential during time T q.Microcomputer 603 is taken into the output at the terminal d of the drive current test section 600 of this state.In the output of the drive current test section 600 of this state,, represent the skew of the output signal of drive current test section 600 as like that in the 1st embodiment explanation.
Microcomputer 603 with the offset level of the output of the drive current test section 600 that is taken into deliver to subtraction portion 500-terminal.Thereby, can eliminate the influence of the skew of drive current test section 600, the electric current of the output of response phase compensation section 116 is focusing on correctly flowing in the coil 352.That is,, the control accuracy of focus control is improved owing to be eliminated as the skew of external disturbance.
The mensuration of the skew of above-mentioned drive current test section 600, the state that stops in the action of focus control carries out.In addition, if time T q is decided to be below several 10 μ s, also can carry out at the state that makes the focus control action.
Identical with the 2nd embodiment, microcomputer 603 is from the difference of the output of 2 phase compensation portion 116 of the different radial direction of CD 100 and the inclination that the radial direction of CD 100 is detected at its interval of 2.
Microcomputer 603 is tilting with flowing in the coil 350 by the electric current that makes the inclination that responds the dish that detects, and makes object lens 103 inclinations.Current value is set in subtraction portion 504+terminal.Subtraction portion 504, as the drive current test section 602 of drive level pick-up unit and the formation and the action of pitch drives portion 308, be with subtraction portion 500, drive current test section 600 with to focus on drive division 302 identical.Thereby, can eliminate the influence of the skew of drive current test section 602, microcomputer 603 response be set in subtraction portion 504+electric current of the level of terminal correctly tilting with flowing in the coil 351.That is, the adjustment precision of the inclination of object lens 103 uprises.
The TE signal is sent to tracking drive division 306 by phase compensation portion 304 and subtraction portion 502.By following the tracks of drive division 306, electric current flows with coil 351 in tracking.Thereby the focus of light beam 106, Be Controlled are on the magnetic track of dish 100.
Subtraction portion 502, follow the tracks of drive division 306 and as the formation and the action of the drive current test section 601 of drive level pick-up unit, be with subtraction portion 500, to focus on drive division 302 identical with drive current test section 600.Thereby, can eliminate the influence of the skew of drive current test section 601, the electric current of the output of response phase compensation section 304 is correctly being followed the tracks of with flowing in the coil 351.That is, the control accuracy of tracking Control uprises.
Like this, according to present embodiment, microcomputer 603 is set in high level by the terminal c that makes drive current test section 600, focusing drive division 302 and the 2nd is focused on can open from the 500 electric dialysis of subtraction portion with coil 352.At this moment, from the signal of drive current test section 600, be illustrated in the skew of the output signal of the drive current test section 600 when focusing is zero with coil 352 mobile drive currents to 500 inputs of subtraction portion.
Thereby, be that benchmark makes this output valve be input to the negative terminal of subtraction portion 500 by microcomputer 603 with controlling with subtraction portion 500 at this moment, the skew of drive current test section 600 is cancelled, and can improve the precision of focus control.In addition, in the tracking Control and the control of tilting, the skew of each drive current test section similarly is eliminated, and can improve each control accuracy.
(the 5th embodiment)
Figure 13 is the calcspar of the 5th embodiment of expression optical disc apparatus of the present invention.In optical disc apparatus shown in Figure 13 805, CD 2 is installed on the motor 27 corresponding to whirligig, with the rotation number rotation of regulation.The rotation number of motor 27 is set by microcomputer 21, and the linear velocity that for example makes motor 27 is for controlling by the dish motor control part 25 corresponding to rotating control assembly definitely. Rotation test section 26,1 all rotating signals are just exported in motor 27 every do 1 week rotations.
Focus on executive component 15a, 15b, clamp the radial direction that object lens 4 are installed in CD 2.Focus on executive component 15a, 15b respectively as shown in Figure 6, contain focusing on the lens carrier that is located at regulation object lens 4 with permanet magnet and focusing coil.
When the 1st focused on drive division 16a and the 2nd and focus on the same focus drive signal of drive division 16b input, the 1st focuses on drive division 16a and the 2nd focused on drive division 16b and moves to focus direction ground and drive object lens 4.Focus on executive component 15a, 15b, corresponding to the 1st focus direction mobile device and the 2nd focus direction mobile device, these constitute the focus direction mobile device together.
In addition, when the 1st focuses on drive division 16a and the 2nd and focuses on the drive division 16b input phase focus drive signal different with signal level, because driving the 1st focuses on the sense of current of drive division 16a and the 2nd focusing drive division 16b and varies in size, the inboard of object lens 4 is different with the addendum modification of the focus direction in the outside.Object lens 4 are tilted to CD 2 radial directions (or radial direction).In a word, focus on executive component 15a, 15b, constitute the tilting gearing of inclination as the object lens of bunching system.
As described in the technology in the past, when the optical axis direction radial direction that CD 2 is equivalent to light beam tilts, produce coma aberration at radial direction.On the contrary, even the radial direction with respect to the optical axis direction CD 2 of the optical axis object lens 4 of light beam tilts, owing to produce coma aberration at radial direction, focus on drive division 16a to the 1st and focus on the different focus drive signal of drive division 16b input phase with the 2nd, by object lens 4 are tilted to radial direction, can offset the coma aberration that CD 2 produces by tilting to radial direction.Reduce coma aberration by inclination object lens 4 like this, can realize good record and reproduction.
Transfer motor 18, be installed in shaven head and send on the axle 17, send axle 17, have the function that makes the bare headed 12 tracking direction mobile devices that move to the radial direction of CD 2 by driving these handovers motor 18 rotation shaven heads.Transferring motor 18, installing and transferring the scrambler 19 of the synchronous production burst signal of rotation of motor 18, the pulse signal that output is synchronous with rotation.Be input to microcomputer 21 from the output of scrambler 19, can detect the rotation angle of motor by count pulse.Owing to transfer the amount of movement of the rotation angle of motor 18, can detect the radial location (specifically by the radial location of the CD 2 of light beam irradiates) of shaven head 12 by the output of scrambler 19 corresponding to shaven head 12.
From the focus drive signal that phase compensation portion 8 comes out, ask to conduct the microcomputer 21 of inclination calculation element of tilt quantity and subtraction portion 23 a side+terminal and addition operation division 24+the terminal input.Microcomputer 21 has the focusing memory of remembering as numeric data with the focus drive signal of input and radial location 22, differentiate present radial location whether and be the radial location of the regulation that detects focus drive signal and set, if the radial location of the regulation of setting, remember at any time as numeric data with the relation of the flip-flop of radial location and focus drive signal and to focus on the memory 22.By microcomputer 21, detect the flip-flop of focus drive signal, use the approximate warping function of warped shapes of detected value decision dish, the order of trying to achieve the order of the inclination approximate function that obtains from warping function and upgrading warping function and inclination approximate function describes in detail below.
Microcomputer 21 is calculated inclination approximate value in radial location by the inclination approximate function of trying to achieve, and generates the output inclination driving signal from the inclination approximate value.Inclination driving signal, be imported into subtraction portion 23-terminal and addition operation division 24+terminal.Subtraction portion 23 from be input to+the signal subtraction computing of terminal is input to-signal of terminal, focuses on drive division 16b output to the 2nd.The value output that addition operation division 24 is input to additive operation the signal of 2+terminal focuses on drive division 16a to the 1st.
Realized by above, on the CD signal face light beam always be controlled as regulation the pack state focus control and reduce the inclination control of the inclination of the coma aberration ground control object lens that bring by inclination.The 8, the 1st focusing drive division 16a of phase compensation portion and the 2nd focusing drive division 16b have the function as focus control device like this, and microcomputer 21, subtraction portion 23, addition operation division the 24, the 1st focus on drive division 16a and the 2nd focusing drive division 16b has the function of controlling as inclination.
As illustrating among the 1st embodiment, will be from the flip-flop of the focus drive signal of phase compensation portion 8 output because the control of tilting.Fig. 8 (a) expression is from the waveform of the focus drive signal of phase compensation portion 8 outputs, and Fig. 8 (b) expression is from the waveform of 1 all rotating signals of rotation test section 26 outputs.In figure separately, the longitudinal axis and transverse axis, output of expression signal and time.Shown in Fig. 8 (a), owing on the dish of rotation, produce end tank wobble, follow end tank wobble in the focus control action, object lens 4 are in the focus direction displacement.Therefore, disc spins between 1 week focus drive signal and end tank wobble synchronously change.As the change essential factor of the focus drive signal beyond the end tank wobble, also can consider to produce scar and groove on the surface of rotating disc.But the change of the focus drive signal that is brought by these influence is more than the gyro frequency.Thereby, by swing circle T averaged focus drive signal, can remove or the mean variation composition in 1 week of coiling, only can detect the flip-flop of focus drive signal necessary in tilting to calculate.In addition, by in tilt detection, using testing result, can detect the inclination of the radial direction of correct CD 2.The focus drive signal of equalization is called the focus drive signal value.
Below, explain method and the formation of asking inclination from the focus drive signal value.Representing the warped shapes of the general CD 2 of CD, DVD, is not the simple rectilinear form of representing at Fig. 4, and as shown in figure 14, for example, with relatively near the warpage periphery is big near interior week, warpage diminishes near most peripheral.Like this, warpage produces of course not in the same manner at radial direction.In addition, the shape of warpage, because of each CD 2 different.In the present embodiment, will be similar to by the function of trying to achieve in the warped shapes that dish produces from the focus drive signal value.Therefore, for the additional precision of inclination that improves object lens 4, the approximation quality height of the function of the warped shapes of expectation decision CD 2 more.
As shown in figure 14, during with 1 approximation to function, the straight line of warped shapes and 1 function is seldom for consistent zone in warped shapes that will dish.To this, for example, during with 3 approximations to function, the straight line of warped shapes and 3 functions is unanimous on the whole in warped shapes that will dish.Like this, preferably be similar to warped shapes with the high function of number of times.
Figure 15 is that expression will be with the warped shapes of the dish shown in the solid line example by 1 approximation to function.As shown in figure 15, the interval of approximate point is with the warped shapes of 3 relatively wide approximate dishes the time, obtain the approximate function represented by straight line L1, the interval of approximate point obtains the approximate function of being represented by straight line L2 with the warped shapes of 5 relatively narrow approximate dishes the time.By Figure 15, narrow its approximation quality in interval of approximate as can be known point is then high.
As known from the above, uprise, make the change of using at operate approximately of counting many,, can improve approximation quality if the interval of approximate point is narrowed down by the number of times that makes approximate function.
But, approximate point is become for a long time, for the necessary time of the warped shapes of inferring dish just elongated.In addition, same because for the number of the approximate point of decision approximate function necessity also becomes many if the number of times of approximate function uprises, for the necessary time of the warped shapes of inferring dish just elongated.Its result, the start-up time that produces optical disc apparatus is with regard to elongated problem.
In the present embodiment, in order to address these problems simultaneously, for CD be divided into write down and reproduce before the initial detecting carried out and writing down and reproduce in 2 stages of the additional detection carried out, the detection of the warped shapes of coiling (warpage).For example, in initial detecting, only detect interior week write read and the warped shapes of the zone of using such as writing afterwards of control information.Thus, reduce the detection time of detecting when counting the shortening startup.Thereafter, at record with in the additional detection in reproducing, in order to stride the detection that full Zhou Tigao approximation quality appends.Shorten the detection time when starting thus, and approximate accurately dish warped shapes becomes possibility.
In addition, initial detecting is with after case for disk is to the optical disc apparatus 805, before carrying out operation of recording or reproducing movement always one of them begins for CD.Usually, initial detecting is carried out based on the packed action of CD, no matter whether the operator has carried out record or reproduced operation, case for disk is all automatically carried out after to the optical disc apparatus 805.But, based on operator's record or reproduce operation, for CD write down or reproduce operation before operation also passable.When the CD of having made initial detecting was placed at optical disc apparatus 805, it was also passable to omit initial detecting when writing down next time or reproducing.
In addition, replenish and detect, CD is carried out at record or in reproducing.This what is called " record or reproduce in " not necessarily mean write down continuously or reproducing movement in the middle of, and during the optical disc apparatus 805 a series of records or reproducing movement that typically stop to the rotation of CD when meaning for CD from opening entry or reproducing movement.Thereby, for example, replenish the detection shaven head and search when moving, and when being in temporary transient halted state, carry out also passable.
Below, ask the concrete method of inclination approximate function and its formation to be described in detail with regard to microcomputer 21 from the focus drive signal of its detection.At microcomputer 21, by the data of memory focus memory 22 in, for as relation at the focus drive signal value y of the output of the focus control portion 8 of the radial location x of check point and its position, be similar to the warping function y=f (x) of regulation.When making warping function be 2 times, f (x) is represented by following formula (12).
f(x)＝ax 2+bx+c (12)
Be the decision of coefficient a, b and c, can use various approximation methods.For example, application least square method coefficient of determination a, b, c also can.When certain radial location xi focus drive signal value is yi, and depart from vi with following formula (13) expression at the value of the warping function f of xi (x) and actual value yi.
vi＝f(xi)-yi＝axi 2+bxi+c-yi (13)
The summation of the quadratic power of the vi that related detection point is whole is when determining the value of a, b, c minimumly, by the average position of cardinal principle of the curve negotiating check point of formula (12) expression.Like this, can calculate the radial location of approximate check point and at the warping function y=f (x) of the regulation of the relation of the focus drive signal value y of its position.
From tilting, can ask inclination approximate function z=g (x) by the differential warping function corresponding to the inclination of warpage.When using a, b, c, inclination approximate function z=g (x) represents by following formula (14).
z＝g(x)＝df(x)/dx＝2ax+b (14)
Thereby, at microcomputer 21, the summation that the data that use is come out from focus memory 22 are exported with the quadratic power of the vi of formula (13) expression is the value that determines a, b, c minimumly, ask inclination approximate function z=g (x), utilize oblique approximate function to inclination, calculate the inclination approximate value in present radial location.With inclination approximate value serve as basis generate, output inclination driving signal thereafter.
The order of the additional detection after the following describes initial detecting and starting.For initial detecting with replenish to detect,, preestablish the radial location (check point) that detects necessary focus drive signal in order to do power and approximate treatment at the used approximate function of microcomputer 21.In addition, set the check point and the additional check point that detects of initial detecting respectively.
Figure 16 is the example of position of check point of focus drive signal value that is illustrated in the radial direction of dish.As shown in figure 16, in initial detecting, obtain the focus drive signal value at the some A on the interior week of CD, the some C on the most peripheral and the some B that is positioned at above-mentioned centre at 2.In replenish detecting, add some A, B, the C of initial detecting in addition, some D, E in the centre of the point that is positioned at these obtain the focus drive signal value.The data of the positional information of the check point of relevant setting are among the EEPROM28 of ROM that is stored at microcomputer 21 (there be not diagram) or connection microcomputer 21.
In the present embodiment, for easy explanation, the number of times that makes warping function is 2, so make in initial detecting and the interval of the check point that uses in replenish detecting as previously mentioned as uniformly-spaced describing, but the invention is not restricted to the kind of the power or the function of this approximate function.The characteristic of the general warped shapes of consideration dish in addition is narrowing down as the interior week of the warped shapes of complexity and the interval that periphery makes check point, also passable at the middle Zhou Biankuan of simple warped shapes.By such practice, can improve approximate value expeditiously with respect to the majority amount of check point, can give correspondence for the dish of various warpages, sagging shape.As the interior week here, middle week and periphery, refer to the radial direction of CD roughly medial region, middle section and the exterior lateral area of 3 timesharing such as grade.
In addition, in initial detecting, at first, in order to hold all warped shapes of CD, also can with the focus drive signal value of the interval detection radius direction of regulation.And based on testing result, the warped shapes of decision dish is set best check point by its warped shapes and also can.For example, as the warped shapes of dish, preestablish than middle perimembranous in bigger the 1st shape of interior perimembranous and peripheral part warpage with about equally curvature the 2nd shape in the integral disc warpage.When being judged as the 1st shape, with the check point of relatively interior perimembranous of middle perimembranous and a plurality of setting focus drive signal of peripheral part density the earth value.In addition, when being judged as the 2nd shape, be the check point of roughly equally spaced a plurality of setting focus drive signal values at middle perimembranous, interior perimembranous and peripheral part.Below, at the check point of setting, carry out initial detecting and replenish detection.By such practice, can improve approximate value expeditiously with respect to the majority amount of check point, can give correspondence for the dish of various warpages, sagging shape.
Below, the processing of the microcomputer 21 of the initial detecting when device starts at first is described.Figure 17 is the process flow diagram of the action of explanation initial detecting.At the state of focus control action, transfer motor 18 by microcomputer 21 controls, make shaven head 12 check point A move (S1) to radial direction.Shaven head 12 arrives check point A, behind the finishing time of the swing of process correction object lens 4, by 1 the swing circle averaged focus drive signal of microcomputer 21 at dish, carries out the detection (S2) of the flip-flop of focus drive signal.Relation between its testing result and the radial location is remembered in focus memory 22 (S3) as numeric data.
Below shaven head 12 is shifted to check point B (S4), detected the flip-flop (S5) of focus drive signal.The relation of testing result and radial location is remembered in storer 22 (S6).And then shaven head 12 shifted to check point C (S7), carry out the detection (S8) of the flip-flop of focus drive signal.With the relation of testing result and radial location as initial detecting data accumulating (S9) in storer 22.If the detection at all check point ABC is finished, finish the processing of initial detecting.Use the initial detecting data by above order microcomputer 21, calculate 2 warping functions (formula (12)).And, ask inclination approximate function (formula (13)).
In the device action, use the inclination approximate function that obtains, the position of corresponding shaven head 12 is asked the inclination approximate value one by one.And, generate inclination driving signal from the inclination approximate value, to subtraction portion 23 and addition operation division 24 outputs.The 1st focusing drive division and the 2nd focuses on drive division and will export to executive component 15a and 15b based on the drive current of inclination driving signal.Thus, object lens 4 respond the inclination of CDs 2 and tilt, and reduce or the elimination coma aberration.
In addition as previously mentioned, moving shaven head 12 in the radial location of stipulating in initial detecting detects.At this moment, when the Spin Control of motor is certain (CLV) mode of linear velocity, change the rotation number of motor every the radial location of regulation.Therefore, the detection of focus drive signal is necessary to carry out behind the finishing time through necessity before being stabilized in setting in the rotation number of motor, thereby increases detection time.At this moment, control, carry out above-mentioned initial detecting, avoid the increase of detection time, can shorten the start-up time of device if keep identical rotation number in certain (CAV) mode of angular acceleration.In addition, when starting the shaven head multidigit in interior all sides.Therefore, rotation number with the interior week of setting when starting is carried out the control of angular acceleration, maintaining the state of its rotation number, if carry out above-mentioned initial detecting, can improve the reliability of the recording of information of the reproduction of control data in necessary interior week and INDEX and DMA etc. in the system of optical disc apparatus.In addition, full week guarantee tilt accuracy owing to stride dish, can improve the system balancing of device integral body by processing in the additional detection of following explanation.
Below just replenish to detect and describe.Additional detection is the detection of carrying out in device action.Figure 18 is the process flow diagram that expression replenishes the action that detects.In the device action, at the state of focus control action, it serves as that current bare headed 12 the radial location in basis is the radial location of representing at the check point A～E of regulation (S1) that microcomputer 21 judges whether with the signal that sends from scrambler 19.Current radial location is if one of them radial location of check point A～E, and the flip-flop of carrying out focus drive signal detects (S2).And then, detecting before it with the same radial location of the check point of now, judge whether that its numeric data remembered in focus memory 22 (S3).Its result, if being carried out before it to detect in same radial location abandons these data (S4), with the relation of the testing result of now and radial location as the numeric data memory in focus memory 22, carry out the renewal (S5) of data.
In addition,, do not carry out S4 if be not carried out detection before it in same radial location, with the relation of the testing result of now and radial location as the numeric data memory in focus memory 22 (S5).Above processing, the radial location that each shaven head 12 is represented to the check point A～E of regulation moves all and is performed, microcomputer 21 by replenish to detect using numeric data and the initial detecting data of being remembered, calculates, upgrades 2 warping functions and inclination approximate function (S6) again.And then microcomputer 21 uses the inclination approximate function that is updated, and always generates, exports the inclination driving signal (S7) in the radial location of now.Inclination driving signal object lens 4 response dishes by output are made optimum tilt, can realize good reproduction and record.
Below like this, whenever replenishing detection, warping function and inclination approximate function just are updated, based on the function that the upgrades control of tilting.Thereby, after the initial detecting, detect up to carrying out to replenish at first, calculate pitch drives value, the control of tilting by inclination approximate function by the initial detecting decision.Thereafter each the execution replenished detection and all upgraded the inclination approximate function, calculates the pitch drives value based on the inclination approximate function that upgrades, by the control of tilting of new calculated value.The approximation quality of the inclination approximate function that is updated owing to the number increase of the approximate point that uses in approximate treatment, relatively is identical or higher than its precision with its inclination approximate function in the past.
Above-mentioned initial detecting and the additional order that detects by microcomputer 21, are undertaken by each inscape of controlling optical disc apparatus 805 successively.The program that its order is carried out in microcomputer 21 is stored in the recording medium of embodied on computer readable of EFPROM28 and ROM, RAM not shown in the figures, hard disk, magnetic recording media etc.
In addition in the present embodiment, when same radial location is carried out the detection of focus drive signal, ask the mean value of the result that remembers previously and current testing result, make memory also passable in focus memory 22.According to such practice, on average can reduce the influence of the detection error that can not eliminate from focus drive signal etc. at 1 swing circle of dish.
In addition, the focus drive signal value that use to detect, the related coefficient of the warping function that has relatively upgraded and upgrade before related coefficient, the latter's value than the former hour, the approximation quality of the warping function that has upgraded be judged as worsen also passable.At this moment, the focus drive signal value of detection is handled as abnormal data, does not make memory in focus memory 22.Thus, owing to can reduce or remove because focusing departs from and by the influence that the incorrect testing result that vibratory impulse brings is calculated, can expect to improve the reliability for the detected value of focus drive signal.Perhaps, the related coefficient of the warping function that has relatively upgraded and upgrade before related coefficient, the latter's value than the former hour, related coefficient is on the related coefficient before upgrading, and changes the coefficient of warping function of the number of times changes persuing number of times more of warping function.And, use the warping function of the number of times that upgrades also can in the inclination control afterwards.Thus, the approximation quality of warping function uprises, the control of can more correctly tilting.
As described above, according to present embodiment, be divided into initial detecting, replenish 2 stages of detection by making tilt detection, it is possible that the shortening of the detection time when starting and raising approximation quality are set up simultaneously.
In addition, owing to after startup, detect the warped shapes of detection dish at any time as a supplement, by the temperature characterisitic of CD 2 etc., after initial detecting, even when the warped shapes of CD 2 changes frequently, the inclination that also can suitably detect, replenish CD 2.
In the present embodiment, use the warped shapes of 1 approximation to function CD 2.But, CD 2 is divided into a plurality of zones at radial direction, per minute every the zone all use different approximations to function also passable.In addition, the warped shapes of CD 2 also can with piecewise linear approximation.Below, as the variation of present embodiment, the approximate optical disc apparatus of warping function that is made of broken line with the warped shapes with CD 2 is described.
By the optical disc apparatus of variation, have by the structure shown in the calcspar of Figure 13.Figure 19 represents the warped shapes of CD 2.In optical disc apparatus, as shown in figure 19,, detect the focus drive signal value at check point A～G by variation.Check point A～G compares with middle perimembranous, and at interior perimembranous and peripheral part, it is big that the density of check point becomes, and separates configuration with unequal interval.As implied above, the warpage in that CD 2 produces usually, owing to become big in interior all sides and outer circumferential side, in the zone of interior all sides and outer circumferential side, becomes big by the density that makes check point, with all warped shapes of can the approximation quality high CD of few check point 2.In the situation of 5 inches CDs of CD and DVD etc., for example, from the center of dish, at position configuration check point A～G of 23mm, 26mm, 31mm, 45mm, 50mm, 55mm, 58mm.The positional information of these check points is remembered in optical disc apparatus in advance.In addition, in order to see easily, Figure 19, the relative distance between check point is not correctly represented for these values.
In the initial detecting when starting, as shown in figure 18,, transfer motor 18, make shaven head 12 check point A move (S1) to radial direction by microcomputer 21 controls at the state of focus control action.Shaven head 12 arrives check point A, behind the finishing time of the swing of process correction object lens 4, by 1 the swing circle averaged focus drive signal of microcomputer 21 at dish, carries out the detection (S2) of the flip-flop of focus drive signal.Relation between its testing result and the radial location is remembered in focus memory 22 (S3) as numeric data.
Below shaven head 12 is shifted to check point B (S4), detected the flip-flop (S5) of focus drive signal.The relation of testing result and radial location is remembered in storer 22 (S6).And then shaven head 12 shifted to check point C (S7), carry out the detection (S8) of the flip-flop of focus drive signal.With the relation of testing result and radial location as initial detecting data accumulating (S9) in storer 22.In Figure 18, do not illustrate, but, shaven head 12 is moved to check point D, E, F, G,, carry out the detection of the flip-flop of focus drive signal at check point separately by same order.If the detection at whole check point A～G is finished, finish the processing of initial detecting.
Below, microcomputer 21 will be asked the warping function that is made of broken line shown in Figure 20 being connected with straight line from the focus drive signal value in the check point of the data adjacency of the focus drive signal value of each check point and radial location.And, ask the inclination approximate function by the warping function that differential is tried to achieve.
In the device action, use the inclination approximate function that obtains, the position of corresponding shaven head 12 is asked the inclination approximate value one by one.And, generate inclination driving signal from the inclination approximate value, to subtraction portion 23 and addition operation division 24 outputs.The 1st focusing drive division and the 2nd focuses on drive division and will export to executive component 15a and 15b based on the drive current of inclination driving signal.Thus, object lens 4 respond the inclination of CDs 2 and tilt, and reduce or the elimination coma aberration.
Figure 21 uses the inclination approximate function, is illustrated in the inclination (inclination of warping function) of each mid point (from the center of dish, the position of 24.5mm, 28.5mm, 38mm, 47.5mm, 52.5mm, 56.5mm) of check point A～G.As shown in figure 21, for negative, correctly represent the warped shapes of CD shown in Figure 19 2 in the value of leaving the inclination of 38mm outer circumferential side from the center of dish.
Below, the order of the additional detection after starting is described., when using broken line, detect replenishing as warping function,, the warping function integral body that is made of broken line can not be upgraded by the focus drive signal value of having upgraded even be updated in the focus drive signal value of 1 check point.Therefore, in variation, when replenishing detection, use other function in order to upgrade warping function.
Behind the optical disk start-up, the warped shapes of CD 2 changes one of essential factor greatly, is the variation of temperature of environment on every side.According to test findings, be r with the position of the radial direction of CD 2, behind time Δ t, at the changes delta y of the warped shapes of position r, can be approximate by following formula (15).
Δy＝a×(r-RO) (15)
Here, a is a proportionality constant, and RO is the indeclinable radial location of warped shapes.For example, RO is the circumferential position of terminal block.Warped shapes because can be by focus drive signal value performance, behind Δ t, at the changes delta f of the focus drive signal value of position r, be a proportionality constant with A, can be represented by following formula (16).
Δf＝A×(r-RO) (16)
Thereby, if know the focus drive signal value when one of them initial detecting of check point A～G and replenish the focus drive signal value that detects, because Δ f is known, in position r substitution formula (16), can try to achieve proportionality constant A with the radial direction of Δ f and check point.
Below, use the proportionality constant A that tries to achieve, from the focus drive signal value Δ f that formula (16) is calculated at other check points A～G, the focus drive signal value of focus drive signal value during from initial detecting and then other check point A～G of calculating when replenishing detection.Use is upgraded warping function in the focus drive signal value of the check point of measuring and the focus drive signal value of other check points A～G that calculates, and then upgrades the inclination approximate function.And, ask the inclination approximate value from corresponding bare headed 12 the position of upgrading of inclination approximate function, and then generate inclination driving signal.
Such order is put in order with reference to Figure 22.In the device action, at the state of focus control action, it serves as that current bare headed 12 the radial location in basis is in the radial location (S1) shown in the check point A～E of regulation that microcomputer 21 judges whether with the signal that sends from scrambler 19.Current radial location is if one of them radial location of check point A～E, and the flip-flop of carrying out focus drive signal detects (S2).
Below, the difference of the focus drive signal value that detects with the focus drive signal value when the initial detecting of this check point with at step S2 is Δ f, is r with the position of this check point, and the substitution formula is asked proportionality constant A in (16), and decision formula (16) is (S3).Use formula (16), the Δ f (S4) that asks at other check points.Focus drive signal value when the Δ f that tries to achieve is added initial detecting is updated in the focus drive signal value (S5) by each check point beyond the point of step S2 detection.
Use is upgraded warping function and inclination approximate value (S6) by the focus drive signal value of step S2 detection and the focus drive signal value of being tried to achieve by step S5.And then, according to the position of shaven head 12, ask the inclination approximate value one by one, from its value, generate inclination driving signal (S7).
In addition, in step as shown in figure 22, in the device action, shaven head replenishes detection when arriving by radial location shown in the check point A～G of regulation.But, as illustrating among the following embodiment, even when when carrying out at the shaven head record and reproducing, using, when having mobile shaven head can replenish the time of detecting, uprush at nearest check point A～G at the magnetic track that carries out record-playback, it is also passable to replenish detection.After device started, particularly dish was subject to big temperature variation, and the possibility of the warped shapes variation of dish is arranged.At this moment, the operating state of pipe unit not, after device started, it was also passable to replenish detection at every official hour (for example per 2 to 3 minutes).
By such present embodiment, for CD be divided into before writing down and reproducing and write down and reproduce in 2 stages, tilt quantity that can the detection dish.In the initial detecting before writing down and reproducing, count, can shorten detection time, in the additional detection in record, reproduction,, can improve the approximation quality of the function of the warped shapes that is similar to dish by the detection of appending by reducing to detect.Thus in the warped shapes of the recording medium that can be similar to CD etc. accurately and when realizing appropriate tilt control, the shortening of detection time in the time of also can realizing starting.In addition, owing to can upgrade warping function and inclination approximate function by replenishing detection, in record and the reproduction, even the tilt variation of CD also can suitably be carried out the inclination control of object lens.
(the 6th embodiment)
Figure 23 is the calcspar of the 6th embodiment of expression optical disc apparatus of the present invention.In optical disc apparatus shown in Figure 23 806, in the inscape identical, give identical reference marks with the 5th embodiment.
In optical disc apparatus 806, from receive each detection signal of detecting device 5 outputs of being separated in the light zone a plurality ofly, in additive operation enlarging section 29,, become reproducing signal (RF signal) by additive operation and amplification, be imported in the equalizer (EQ) 30.
Equalizer 30 makes reproducing signal in this signal band domain waveform equalization, and the signal of handling is outputed to data limiter (DSL) 31.Data limiter (DSL) 31, with the wave shape equalization change reproducing signal and memory in advance specified level relatively, generate 2 value data-signals based on its result by 2 values, make 2 value data-signals output to PLL circuit (PLL) 32.PLL circuit 32 meets the frequency control and the phase control of the clock signal of 2 value data-signals, makes 2 value data-signals and clock signal synchronous.Generate data window from this clock signal synchronous, extract the data of distinguishing in its window out, export to demodulation section 33 and ID reading part 34 as synchronized data signal.Demodulation section 33, the demodulation synchronized data signal outputs to demodulating data in the error revising circuit (ECC) 35 of correcting device as error in label.Error revising circuit 35 carries out the error revising of demodulating data, the data-signal (DATA) that output is corrected.
As the microcomputer 21 of error detecting apparatus, monitoring error revising circuit 35 in addition, by the data counts margin of error before and after relatively correcting, from margin of error error of calculation rate.ID reading part 34, the sector ID from synchronized data signal detects sector address signal, and the address information that will be equivalent to current scanning position outputs to main frame.In addition, ID reading part 34, in the time can not detecting sector address signal, the sevtor address that detects before utilizing and the clock of PLL circuit 32 replenish the non-detectable sevtor address of output.Like this sevtor address that replenishes is called the simulation address.Microcomputer 21 is being monitored ID reading part 34, and the number of times of calculating the simulation address is outputed in the simulation address counter 36 as the error in address pick-up unit.
In the present embodiment, identical with the 5th embodiment, initial detecting and 2 stages of the additional detection in the device action of being divided into when starting are detected.Particularly in the present embodiment, in the method that realize to replenish detects and realize in its formation feature being arranged.Relevant initial detecting is by with the common method of the 5th embodiment with constitute and can realize.
Additional detection at present embodiment is carried out in device action.Figure 24 is the process flow diagram of order of representation.Microcomputer 21 monitoring error revising circuit 35, whether the error in judgement rate surpasses setting (S1).The relevant regulations value for example when the DVD device, is set in from 1 * 10 as bit error -3To 5 * 10 -3The left and right sides is proper.This results from and be limited to 5 * 10 on 1 its possible bit error of error revising in the DVD device -3About.But the setting of setting other is also passable.
If error rate surpasses predefined setting, carry out the detection (S2) of the flip-flop of focus drive signal, and then with the relation of this testing result and radial location as remembering in focus memory 22 (S3) with Value Data.Replenish and detect, whenever confirming that error rate surpasses setting and just carries out, microcomputer 21 uses the numeric data and the initial detecting data that detect memory by replenishing, calculates, upgrades warping function and inclination approximate function (S4) once more.And then microcomputer 21 uses the inclination approximate function that has upgraded, and always generates, exports the inclination driving signal (S5) in current radial location.By the inclination driving signal of output, make optimum tilt according to the surface configuration object lens 2 of CD 2, can realize good reproduction.
According to present embodiment, the increase of mismatch error rate is carried out replenishing at any time detecting.Therefore, the precision of the warping function during to reproduction worsens suitably and detects in real time, can upgrade warping function and inclination approximate function.Its result makes by the renewal that replenishes the warping function that detects, and can be reflected at any time in the control.
In addition,, be not only above-mentioned error rate, promptly use simulation address 36 also can realize in the judgement of the time-delay of the execution of the additional detection of present embodiment.Figure 25 is the process flow diagram that the order of the additional detection of simulating address 36 is used in expression.The additional detection of using simulation address 36 is described with this figure.
Microcomputer 21 judges whether the count value of the simulation address of detecting 36 surpasses predefined count value (S1), carries out the detection (S2) of the flip-flop of focus drive signal when surpassing the count value of regulation.And, remember in focus memory 22 (S3) as numeric data with the relation of testing result and radial location.Replenish and detect, the count value that surpasses regulation whenever the count value of confirming simulation address 36 is just carried out.Microcomputer 21 uses the numeric data and the initial detecting data that detect memory by replenishing, calculates, upgrades warping function and inclination approximate function (S4) once more.And then microcomputer 21 use inclination approximate functions, always generate, export inclination driving signal (S5) in the radial location of current light beam.According to the inclination driving signal of output, object lens 2 are tilted, can realize good reproduction and record.
Below like this, cooperate the increase of simulation address counting,, suitably and in real time detect the deterioration of the precision of warping function, can upgrade warping function and inclination approximate function by replenishing detection at any time.By the renewal that replenishes the warping function that detects, be reflected at control at any time.
In addition, above-mentioned additional detection has been judged its execution by error rate and simulation address counter in the optical disc apparatus action.But, because the warpage of CD 2 changes according to temperature, make temperature sensor 185 and the A/D conversion is done in the output of temperature sensor 185 and be arranged on optical disc apparatus 806 to the A/D translation circuit 186 of microcomputer 130 inputs, whether the output of being judged temperature sensor by microcomputer 21 has changed more than the predefined setting, carries out by the renewal that replenishes the warping function that detects also passable.Figure 26 is the process flow diagram of order of the additional detection of expression serviceability temperature sensor, and the additional detection of serviceability temperature sensor is described with this figure.
Microcomputer 21 to the variation of temperature amount that detects by temperature sensor 185, judges whether to surpass predefined setting (S1), carries out the detection (S2) of the flip-flop of focus drive signal when surpassing setting.Relation with this testing result and radial location is remembered in focus memory 22 (S3) as numeric data.Replenish and detect, the value that surpasses regulation whenever the temperature variation of confirming to be detected by temperature sensor is just carried out.Microcomputer 21 uses the numeric data and the initial detecting data that detect memory by replenishing, calculates, upgrades warping function and inclination approximate function (S4) once more.And then the inclination approximate function of microcomputer 21 use renewals, always generate, export inclination driving signal (S5) in the radial location of now.According to the inclination driving signal of output, object lens 2 are tilted, can realize good reproduction and record.
Like this, the serviceability temperature sensor replenishes detection by cooperating temperature variation, and suitable detection by the tilt variation of the CD 2 of the temperature characterisitic generation of CD 2, can be upgraded warping function after startup.In addition, upgrade, be reflected at any time in the control by replenishing the warping function and the inclination approximate function that detect.
According to present embodiment, error reaches additional address, when being the error in address generation, suitably upgrades warping function and inclination approximate function, carries out the calculating again of pitch drives value.Therefore, be equivalent to the warpage of part and the external disturbance of inclination (for example irregular inclination of the inclination executive component that is brought by scar etc.) in generation, the reading and write of this partial data is called possibility.
Particularly in the reproduction of animation data, record, to handle when needing the time in the renewal of this warping function, data interruption is easy to generate the problem of observations such as message block noise.But as use present embodiment be 1 owing to replenish the point that detects by 1 time, then be not created in the reproduction of animation data, the data interruption in the record.
According to such present embodiment, the corresponding contained error ratio of data when reproducing or write down, owing to carry out the renewal of warping function, appropriate tilt control at any time all becomes possibility, can reproduce or record with good state.Data write or reliability of reading thereby can improve.
(the 7th embodiment)
Figure 27 is the calcspar of the 7th embodiment of expression optical disc apparatus of the present invention.At optical disc apparatus shown in Figure 27 8067, in the inscape identical, give identical reference marks with the 6th embodiment.
When optical disc apparatus 807 carries out reproducing movement, the reproduction data-signal (DATA) behind the error revising of error revising circuit 35 output, input is stored into as making reproduces the reading in the buffer memory 37 of snubber assembly that data deposit temporarily.Be stored in the reproduction data of reading in the buffer memory 37,, output in the principal computer 38 by microcomputer 21 according to the requirement of sending from principal computer 38.By such processing, optical disc apparatus 807 can reproduce the signal that is recorded on the CD.In addition, buffer memory 37 is read in microcomputer 21 monitorings, can detect and be stored in the data volume of reading in the buffer memory 37.
In addition, optical disc apparatus 807 from the record data of principal computer 38 output, is stored in the compose buffer storer 39 as the snubber assembly of interim folding and unfolding record data when carrying out operation of recording.Be stored in the record data in the compose buffer storer 39, output in the modulation portion 40, by the modulation system modulation of regulation by microcomputer 31.Modulated data output to make and are equipped in the luminous LD drive division of the light source 1 of shaven head in 12 (laser and utmost point pipe drive division) 41.Light source 1 sends the light beam of corresponding drive signal of coming out from LD drive division 41, by the light beam irradiates sent to the record surface of CD 2 on the record surface of CD 2 tracer signal.In addition, microcomputer 21 monitoring compose buffer storeies 39 can detect the data volume that is stored in the compose buffer storer 39.
The following describes as the data of the feature of present embodiment and read and write and replenish the time-delay that detects.Speed definition that will the data input and output between the region memorizer at CD 2 and buffering be Vin, be Vout with the speed definition of the data input and output between buffer memory and the principal computer 38.Owing to guaranteeing that a little the execution time that deals with again guarantees performance, usually, make the speed of Vin＞Vout ground setting data input and output.Optical disc apparatus 807 also will satisfy this relation.
The time of reading the data volume in the buffer memory 37 that Figure 28 is illustrated in the reproducing movement of optical disc apparatus 807 changes.(time t0～t1), the data of reading from CD 2 are sent to be read the buffer memory 37 between shaven head 12 carried out the reading duration of data from CD 2.At this moment, the data volume of reading in the buffer memory 37 increases with the speed of Vin-Vout.(time t1～t2), the data volume of reading in the buffer memory 37 reduces with the speed of Vout by the intercourse of reading of shaven head 12 data.
In the reproducing movement of optical disc apparatus 807, from read buffer memory 37 to the reproduction data of principal computer 38 output do not interrupt yet can, the interruption of reproducing data is that to read data volume in the buffer memory 37 be state (time t3) below 0.Thereby, reading the data volume in the buffer memory 37, the amount M1 that does not always reduce to regulation controls the trigger of reading action followingly also can.The amount M1 of relevant regulations for example in DVD, is set in that composition error is corrected symbol and the capacity of 1 product code 1ECC (Error Correcyion Code) message block of making is suitable.But capacity M1 is that the capacity value in addition of 1ECC message block is also passable.
Will the time t4 in the reproducing movement of optical disc apparatus 807 read data volume in the buffer memory 37 be defined as Mr (＞M1),
T1＝(Mr-M1)/Vout (17)
During the time T 1 of Ji Suaning, shaven head 12 interrupts reading of data, can carry out other processing thus.Following this time T 1 is called time T 1 more than needed.
In other words, even interrupt the action of reading of data,, do not interrupt to the reproduction data of principal computer 38 outputs if data volume shaven head 12 in for the time t5 of M1 of reading thereafter in the buffer memory 37 begins the action of reading of data again at time t4 shaven head 12.
Figure 29 in addition, the time that is illustrated in the data volume in the compose buffer storer 39 in the operation of recording of optical disc apparatus 807 changes.In the operation of recording of optical disc apparatus 807, be sent to the speed of compose buffer storer 39 with Vout from principal computer 38 data.Therefore (time t6～t7), the data volume in the compose buffer storer 39 increases with the speed of Vout shaven head 12 during the writing of optical disc data not carrying out.
In addition, shaven head 12 carries out that (time t7～t8), the data volume in the compose buffer storer 39 reduced with the speed of Vin-Vout during data write.In the operation of recording of optical disc apparatus 807, be necessary all record data from principal computer 38 outputs are written on the CD 2.For this reason, the data volume in the compose buffer storer 39 reaches the size of buffer memory, if avoid not having reception also passable from the state (t9) of the spatial capacity of the record data of principal computer 38 outputs in compose buffer storer 39.Thereby being stored in data volume in the compose buffer storer 39, to be no more than the amount M2 of regulation also passable.The amount M2 of regulation is suitable about half of the big or small MW of compose buffer storer 39.
This produces the write activity that deals with shaven head 12 again and is interrupted in the operation of recording of device, be to consider that once more data have the amount that is stored in the possibility in the compose buffer storer 39.In addition, the amount M2 of this regulation is that value beyond about half of big or small MW of compose buffer storer 39 is also passable.
To be defined as in the data volume in the compose buffer storer 39 of time t8 in the operation of recording of device Mw (＜M2),
T2＝(M2-Mw)/Vout (18)
During the time T 2 of Ji Suaning, shaven head 12 interrupts write activity, can carry out other processing thus.Following this time T 2 is called time T 2 more than needed.
In other words, at time t8, even shaven head 12 interrupts write activity, the data volume in the compose buffer storer is in the time t10 that is M2 thereafter, if shaven head 12 begins write activity again, the record data of exporting from principal computer 38 all are recorded in the CD 2.
More than data volume Mw in the compose buffer storer 39 of the reproducing movement of reading data volume Mr in the buffer memory 37 and optical disc apparatus of reproducing movement by being conceived to optical disc apparatus, can calculate and can interrupt time T more than needed 1, the T2 that shaven head 12 is read action and write activity, it is possible carrying out tilt detection in this time.
In the present embodiment, identical with the 5th and the 6th embodiment, initial detecting and 2 stages of the additional detection in the device action of being divided into when starting are carried out tilt detection.Initial detecting and the 5th and the 6th embodiment similarly carry out, and replenish to detect and carry out in above-mentioned time T 1 more than needed, T2.Figure 30 is the process flow diagram of sequence of movement of the additional detection of expression optical disc apparatus 807.
At first, consider that optical disc apparatus 807 carries out the situation of reproducing movement.Microcomputer 21 judges whether that the current data volume Mr that reads in the buffer memory 37 has surpassed the capacity M1 (S1) that stipulates.Data volume Mr from now when surpassing the capacity M1 of regulation calculates the time T of being calculated by formula (17) more than needed 1 (S2).Microcomputer 21 moves from current position with interior 12 in time T 1 more than needed, carries out the detection of the flip-flop of focus drive signal in this position, judges whether that once more bare headed 12 can get back to the check point (S3) of current position.When the check point that can carry out was arranged, shaven head 12 interrupted reading action (S4), moves to and is judged as the above-mentioned check point (S5) that can carry out processing.Carry out the detection (S6) of the flip-flop of focus drive signal at the check point microcomputer 21 that moves, its testing result and radial location relation are remembered in focus memory 22 (S7) as numeric data.Thereafter, shaven head 12 moves to original radial location (S8), begins to read action (S9) once more.
In addition, when optical disc apparatus 807 carried out operation of recording, microcomputer 21 judged at first whether the data volume Mw in the current compose buffer storer 39 is lower than the capacity M2 (S1) of regulation.Calculate the time T of calculating by formula (18) from the data volume Mw of now more than needed 2 (S2).Microcomputer 21 moves from current position with interior 12 in time T 2 more than needed, carries out the detection of the flip-flop of focus drive signal in this position, judges whether that once more bare headed 12 can get back to the check point (S3) of current position.When the check point that can carry out was arranged, shaven head 12 interrupted write activity (S4), moves to and is judged as the above-mentioned check point (S5) that can carry out processing.Carry out the detection (S6) of the flip-flop of focus drive signal at the check point microcomputer 21 that moves, its testing result and radial location relation are remembered in focus memory 22 (S7) as numeric data.Thereafter, shaven head 12 moves to original radial location (S8), begins write activity (S9) once more.
During the reproduction of such device and the additional detection during record, shaven head 12 moves to regulation from current position check point is more than needed from be stored in the data capacity of reading buffer memory 37, the compose buffer storer 39 and judge, carry out the time whether D. C. value that detects focus drive signal is arranged as far as possible.
And then microcomputer 21 uses the numeric data and the initial detecting data that detect memory by replenishing, calculates, upgrades warping function and inclination approximate function (S10) once more.Microcomputer 21 uses the inclination approximate function that is updated, and always generates, exports the inclination driving signal (S11) in the radial location of now.Inclination driving signal by output tilts object lens 4, can realize good reproduction and record.Like this, by the warping function that replenishes detection and the renewal of inclination approximate function, be reflected at any time in the control.
Below, illustrate that optical disc apparatus 807 makes the inclination control of the object lens that reproduction can be so that more the high power quick-action be done compared with record.In this situation, utilization read buffer memory 37, compose buffer storer 39 by change reproduce and record in time interval of renewal of warping function and inclination approximate function, the renewal of warping function that can be suitable and inclination approximate function and reproduce and record in the guaranteeing of suitable approximation quality.As high power speed,, be called than predetermined rotational speed rotating disc soon also in order to improve when record and data when reproducing are passed on speed.
Figure 31 is the warped shapes of the warpage of the indicating panel dish when being linearity.At this moment, because supposition dish warpage is linearity, the optional position between the check point O of the I in interior week of dish and periphery tilts for constant.Thereby the initial detecting during by startup detects the flip-flop at the focus drive signal of check point I, the J of interior perimembranous, by calculating, can calculate warping function and inclination approximate function.But actual dish warpage is owing to usually become big more to peripheral part more, and warping function is different with actual warped shapes.
Figure 32, expression warping function and certain dish warped shapes.As seen from the figure, nearby approximate error is little at check point I, the J in interior week, but nearby nearby approximate error is big than check point I, J at the check point M in middle week, the check point O of most peripheral nearby so that approximate error become big.In a word, when straight line is used as the set-back function, become big more to peripheral part more.
Thereby to CD 2 during with high power speed successively reproducing and continuous recording, because shaven head also accelerates to the speed that the peripheral direction of dish moves, rotational speed is high more, is necessary more to shorten to replenish the interval of detecting and upgrade warping function and inclination approximate function continually.
Figure 33 changes the time of reading the data volume in the memory buffer 37 that is illustrated in the reproducing movement of optical disc apparatus.In the reproducing movement of device, data volume shaven head 12 in reaching the time t12 that reads buffer memory size MR of reading in the memory buffer 37 interrupts reading when moving, and the data volume in the memory buffer 37 reduces with the speed of Vout.Thereafter, the data volume in reading memory buffer 37 is among the time t13 of M1, if shaven head 12 begins to read action once more, the reproduction data that output to principal computer 38 are not interrupted.
Thereby, replenish detection between t12～t13 between at this moment, can upgrade warping function.Thereafter, shaven head 12 read action when beginning once more, in reading memory buffer 37 with the speed storage data of Vin-Vout.When the data volume in reading memory buffer 37 can be had more than needed, interruption shaven head 12 is read action once more became possibility, can carry out the renewal of warping function and inclination approximate function once more.Thereby, be updated in time interval of the warping function in the reproducing movement of device, depend on as can be known at the speed Vin-Vout that reads memory buffer 37 store data inside.
In addition, Figure 34 changes the time of writing the data volume in the memory buffer 39 that is illustrated in the operation of recording of device.In the operation of recording of optical disc apparatus, the data volume in writing memory buffer 39 is when shaven head 12 interrupts write activities among the time t14 of O, and the data volume of writing in the memory buffer 39 increases with the speed of Vout.Thereafter, the data volume in writing memory buffer 39 reaches among the time t15 of M2, if shaven head 12 begins write activity once more, will can all record on the CD 2 from the record data of principal computer 38 outputs.
Thereby, from this time t14 to replenishing detection the t15, can upgrade warping function.The data volume of writing when beginning shaven head 12 write activity once more thereafter, in the memory buffer 39 reduces with the speed of Vin-Vout.When the capacity of writing memory buffer can be had more than needed, interrupting bare headed 12 write activities once more became possibility, can upgrade warping function once more.Thereby, in the time interval of the warping function when being updated in record, depend on as can be known and write the speed Vin-Vout that memory buffer 39 interior data reduce.
Figure 35 is illustrated in than record-playback to change for the data volume times of reading memory buffer 37 in the optical disc apparatus of going back high power speed and write in the memory buffer 39.Vin when reproducing is Vin1, and the Vin during with record is Vin2, owing to be high power speed more, the relation establishment of Vin1＞Vin2 compared with record-playback.Relation in the reproducing movement of device, is read the speed Vin-Vout that the data volume in the memory buffer 37 increases thus, and the speed Vin2-Vout that reduces than the data volume of writing in the memory buffer 39 in the record of device becomes bigger.
Here, shaven head 12 interrupts reading the time-delay of action, reads memory buffer 37 interior data volume conducts and reaches the time-delay of reading buffer memory size MR, and shaven head 12 interrupts the time-delay of write activity, is the zero time as the data volume of writing in the memory buffer 39.In addition, be stored in the maximum of reading the data memory buffer 37 in the action and in the write activity of shaven head 12, be stored in the maximum of writing the data in the memory buffer 39 reading of shaven head 12 equal,
MR-M1＝M2 (19)
Relation set up.At this moment, by Figure 21, in the time interval of the warping function when upgrading high power speed and reproducing, the time interval of the warping function when being updated in record relatively will lack as can be known.
In a word, the time interval of the warping function when being updated in high power speed and reproducing is compared and can shorten during with record, and this can satisfy from remaining on and reproduces and the necessity of the viewpoint of the suitable approximation quality of record.
Like this, according to present embodiment, utilize and to read memory buffer 37, to write the data of storage in the memory buffer 39, judgement can be interrupted shaven head 12 and reads time-delay with write activity, can replenish detection at any time.Thereby the reproducing movement of optical disc apparatus is interrupted to the flowing of the reproduction data of principal computer output, in addition, in the operation of recording, do not interrupt carrying out the renewal of warping function and inclination approximate function, can carry out appropriate tilt control from the flowing of the record data of principal computer output.
In addition, particularly in the CD-R/RW that also will do reproduction, in the optical disc apparatus as representative, in reproduction and record, can guarantee the approximation quality of warping function with the high power quick-action than record.
Like this owing to always can reproduce and record with good state, present embodiment makes the coded data that needs successional computing machine and music information be fit to for the reproduction of the data of numeralization and record.
In addition, from above-mentioned the 1st to the 7th embodiment, illustrated that CD uses the present invention of the CD with 1 recording layer.But the present invention also can dispose the CD with the recording layer more than 2 layers.When CD is that 2 layers of CD of the 1st and the 2nd data record layer are arranged, detect the inclination of recording layer separately, based on testing result, object lens can tilt.In addition, among the from the 5th to the 7th embodiment, above-mentioned initial detecting action and the additional data record layer that moves for separately that detects are carried out, determine that respectively warping function and inclination approximate function are also passable.But, in the quantity of the check point of initial detecting for a long time,, by carrying out initial detecting, elongated equally in the time that initial detecting needs for 2 data recording layers.Elongated when becoming problem in the time that initial detecting needs, for example use check point A～G to carry out initial detecting as mentioned above for the 1st data record layer, for the 2nd data record layer, only use check point E～G to carry out initial detecting.And,, use in focus drive signal value for the check point A～D of the 1st data record layer in focus drive signal value for the check point A～D of the 2nd data record layer.Even data record layer is 2 layers of interior all side at CD 2, the difference of warping function is little, is because the pitch angle of 2 data recording layers comes down to equate.By using such detection method,, also can keep accuracy of detection substantially even shorten detection time.
In addition,, measurement is not set focuses on the circuit of the drive current of drive division 16b output, but adopt the formation of the 1st embodiment, detect drive current and can yet from the 1st focusing drive division 16a and the 2nd from above-mentioned the 5th to the 7th embodiment.In a word, the from the 5th to the 7th embodiment can make up with the 1st embodiment harmoniously.In addition, as the device of inclination object lens, adopt and tilt also can with coil.At this moment, based on the inclination approximate value of trying to achieve from the inclination approximate function, decision drives the drive current with coil, and object lens are tilted according to the warped shapes of dish.In a word, the 5th to the 7th embodiment and the 1st to the 4th can both make up by embodiment harmoniously.
In addition, at the control method of the optical disc apparatus that from above-mentioned the 1st to the 7th embodiment, illustrates and the driving method of object lens etc., its program of carrying out in microcomputer of order is stored in the recording medium that computing machines such as EEPROM and ROM, RAM, hard disk, magnetic recording media can read.
According to the present invention,, also can make the inclination of object lens response CD and tilt even produce the inclination that brings by warpage etc. at the optical disc data face.Therefore, realize correctly to carry out the record of data, the optical disc apparatus of reproduction by appropriate tilt control.
In addition, reduce the influence that the skew by drive division that drives object lens and control part brings, can realize high-precision control.

Claims (6)

1. optical disc apparatus is characterized in that having:
The whirligig of rotary information recording medium,
To the light source of the data surface illumination beam of described information recording carrier,
The bunching system of the described light beam of pack,
Detect the focusing-error detecting device that staggers between the focus of described data surface and the light beam by described bunching system pack,
The first focus direction mobile device that one end of described bunching system is moved to the direction vertical with described data surface,
The second focus direction mobile device that the other end of described bunching system is moved to the direction vertical with described data surface,
On described data surface, to make the mode of described light beam with the state pack of regulation, the focus control device that drives to equidirectional based on the output of described focusing-error detecting device and with the described first focus direction mobile device and the described second focus direction mobile device
The tracking direction mobile device that described light source is moved on the radial direction of described information recording carrier,
Try to achieve respectively on different 2 of described radial direction integral multiple during described information recording carrier rotated for 1 week during the mean value of output of the described focus control device that obtains, and based on described 2 different mean value, obtain the inclination calculation element of the inclination of described data surface
According to the output of described inclination calculation element, described first focus direction mobile device and the described second focus direction mobile device are driven the incline controller that described bunching system is tilted diametrically round about.
2. optical disc apparatus as claimed in claim 1, it is characterized in that, described whirligig makes described information recording carrier rotation, so that compare when being positioned at all sides of described information recording carrier with described light source, the rotational speed of described information recording carrier is little when described light source is positioned at the outer circumferential side of described information recording carrier, compare when being positioned at all sides of described information recording carrier with described light source, the value of described integral multiple is little when described light source is positioned at the outer circumferential side of described information recording carrier.
3. optical disc apparatus as claimed in claim 1, it is characterized in that, also has the drive level device for detecting difference, this drive level device for detecting difference detects the motivation value of described first focus direction mobile device and the described second focus direction mobile device, and export the poor of each detected described motivation value
Described incline controller drives described first focus direction mobile device and the described second focus direction mobile device so that the output of described drive level device for detecting difference becomes the mode of the value of regulation round about according to the output of described inclination calculation element.
4. optical disc apparatus as claimed in claim 3, it is characterized in that described incline controller is so that the described drive level device for detecting difference of the state that described first focus direction mobile device and the described second focus direction mobile device stop to be output as reference level.
5. optical disc apparatus as claimed in claim 4 is characterized in that described reference level is upgraded at interval with official hour.
6. optical disc apparatus as claimed in claim 4 is characterized in that, also is provided with temperature sensor, changes to when the output of described temperature sensor under the situation more than the value of regulation, upgrades described reference level.
CNB2007100054054A 2001-12-19 2002-12-19 Optical disc apparatus Expired - Fee Related CN100476963C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001385808 2001-12-19
JP2001385808 2001-12-19
JP2002005592 2002-01-15

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CNB021570531A Division CN1308938C (en) 2001-12-19 2002-12-19 CD apparatus

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CN100476963C true CN100476963C (en) 2009-04-08

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