CN100440328C - Optical disk device - Google Patents

Abstract

An optical disk apparatus for reproducing information from plural types of information carriers or for recording information to plural types of information carriers, has two or more light sources with different wavelengths, a converging part for converging a light beam emitted from each of the light sources on said information carrier, a movement part for moving the converged spot of the light beam converged by the converging part in a direction substantially perpendicular to the surface of the information carrier, a convergence condition detection part for outputting a signal corresponding to the convergence condition of the light beam on the information carrier, an amplitude detection part for measuring the amplitude of the signal of the convergence condition detection part, and a focus control part for driving the movement part in accordance with the output signal of the convergence condition detection part and for performing control so that the convergence condition of the light beam on the information carrier becomes substantially constant.

Description

Optical disc apparatus

The application is to be that June 1, application number in 1998 are 200410003709.3 divide an application the applying date.

Technical field

The present invention relates to a kind of optical disc apparatus, be used for signal is recorded information carrier in the mode of light, and utilize the light beam of light sources such as laser to reproduce the signal of record.

Background technology

The optical disc apparatus of playback CD disc and CD-ROM uses the lasing light emitter of wavelength as 780nm usually.

Yet playback high density compact disc (this CD is compared with CD, and density is higher, and capacity is bigger, abbreviates SD as) uses the lasing light emitter of wavelength as 650nm.

A kind of device has been proposed, the short wavelength laser that its device has the long wavelength laser of 780nm to be used for CD and 650nm is used for compact disc, thereby, the long wavelength laser of 780nm be used to reset CD and CD-R, the 650nm short wavelength laser compact disc SD that is used to reset.

In a kind of like this device, not understanding the disc that has been encased in this device is CD or compact disc SD.In order to distinguish, all connect these two laser instruments, the line focusing of going forward side by side servocontrol and tracking control, thus check this dish of whether can resetting.

Yet; under the situation of CD-R of having packed into; if throwed short wavelength's laser; and carry out the control of focus control and tracking servo; then the light beam of laser instrument is assembled usually; and project on the disc record film 1/4th and enclose the zone of 1/2nd circle scopes, thereby, caused the problem of having wiped the information that has write down.Even wiping seriously of this information can not recover to attempting error correction, may not reproduce these information.Wipe by underlying cause and produce.Have best reflection characteristic because the organic coloring layer of CD-R is usually designed on 780nm, if projection 650nm or shorter laser, then light will not be reflected but will be absorbed.Therefore, be difficult to detect catoptrical intensity, thereby be difficult to reproduce this information corresponding to the information of mark on the recording film.In addition, it is little that light beam spot becomes, the power height of each unit area, and recording film itself has absorption characteristic, thereby, the information that may wipe record.

And, in above-mentioned conventional optical disc device, when the CD playback speed is increased to 6X, 12X and 24X, square the increasing of disc oscillating acceleration and eccentric acceleration and disc playback speed (rotating speed) with being directly proportional.Therefore, different along with various discs and various disc cartridges, oscillating acceleration and eccentric acceleration may exceed the scope that focus control and tracking ride gain allow, thereby can not control, and may produce the problem that can not start.

And, spindle drive motor at high speed rotating (for example 24X) in the scope of low speed rotation (for example standard speed),, be difficult to have permanent torque.In addition, spindle drive motor itself has multiple.Consider these factors, the Spin Control of disc become unstable, this unsettled be controlled to have produced in the reproducing signal beat, thereby produce the low problem of performance.

Summary of the invention

The present invention plans to solve the problem that runs in the above-mentioned conventional art, proposes the start-up operation control method of a kind of reproduction (or record) CD, CD-R and novel high-density disk.In addition, the present invention also provides a kind of and stably carries out the method for focus control and tracking control and stably be rotated the method for control, and provides a kind of with the high-performance playback with write down the device of novel high density compact disc and play CD

In the present invention, distinguish the type of normally before focus control and tracking control, determining disc.The light beam of assembling is mapped to the time (several milliseconds) of lacking very much on the disc record face.Even therefore one of information flag loses, also can proofread and correct the mark of losing fully, thereby when information reproduction, can not have problems.

In addition, according to the present invention, in providing two or more devices with long and short long wavelength laser, for example, in the device that provides three laser instruments, at first throw the light of the longest laser instrument of wavelength 1, under the situation of not carrying out the control of focus control and tracking, distinguish, with the disc that determine to load whether CD, CD-R.If not CD, CD-R, then then throw the light of the long laser instrument 2 of wavelength second, same, under the situation of not carrying out the control of focus control and tracking, distinguish, determine whether high-density disk of the disc that loads.If disc is not a high-density disk, then throw the light of the shortest laser instrument of wavelength, same, under the situation of not carrying out the control of focus control and tracking, distinguish whether what determine loading is the super-high density disc.Distinguish with such order.When the light time of each laser instrument of projection, and when utilize laser instrument to determine to load be the disk types that will reset the time, at first carry out focus control and tracking and control, so that carry out binary operation and error correction, the information on the reproduction dish.

And in the present invention, during above-mentioned distinguishing, the device (for example CD-RW etc. coils the existing compatible apparatus of sheet again) with high reproducing power is configured to low power transmissions.Therefore, though since distinguish wrong short wavelength's laser projections to disc, for example project on the CD-R etc., can prevent that also information from being wiped fully.

Below, the structure relevant with the application described.

First invention of the present invention is a kind of optical disc apparatus, be used for information reproduction from the various types of information carrier, or be used for information is recorded the various types of information carrier, it comprises two or more light sources with different wave length, the convergence apparatus of the beam convergence that makes each described light emitted to the described information carrier, the mobile device that the convergence luminous point of the described light beam that described convergence apparatus is assembled moves on the direction of described information carrier surface in perpendicular, the convergence condition detection apparatus of the signal of situation is assembled in output on described information carrier corresponding to described light beam, detect the amplitude detecting device of amplitude of the described signal of described convergence condition detection apparatus, and focus control device, be used for driving described mobile device according to the described output signal of described convergence condition detection apparatus, and control, make the convergence situation of described light beam on described information carrier constant substantially, when starting or restarting described optical disc apparatus, before driving described focus control device, has one of described light source of predetermined wavelength if connect, and driving described mobile device makes described convergence apparatus near leaving described information carrier then or leaving then near described information carrier, described optical disc apparatus is just distinguished, determines the type of the information carrier of described loading according to the signal of described amplitude detecting device; If have the described light source of described predetermined wavelength and the Type-Inconsistencies of the information carrier of the described loading of having been distinguished, then connect another light source with different wave length, described optical disc apparatus is finally found out the consistent light source of type with the information carrier of described loading, drives described focus control device then.

Above-mentioned first kind of structure for first kind of optical disc apparatus according to the present invention, connecting wavelength is the laser instrument of 780nm, it is as the long CD of wavelength, be used for CD, CD-R, the light beam that this laser instrument produces is by the convergent lens as convergence apparatus, the line convergence of going forward side by side, project loading as on the CD of information carrier.In addition, drive focus actuator, and measure from assembling the amplitude of the focus error signal that when light beam shifts near or move apart CD, obtains (FE) that condition detection apparatus sends here as mobile device.Measured value and the predetermined value of distinguishing are compared,, determine that CD is CD, CD-R or SD to distinguish.If the CD that loads is CD, CD-R, then carry out the control of focus control and tracking immediately, read the information (TOC information etc.) on the CD, enter dormant state.If the CD that loads is SD rather than CD, then turn-off the light source of 780nm wavelength, connect another short wavelength's light source (for example 650nm).The light beam that light source is produced is assembled by the convergent lens as convergence apparatus, and project loading as on the CD of information carrier, carry out the control of focus control and tracking, read the information (control session information etc.) on the CD, enter dormant state.

Second invention of the present invention is a kind of optical disc apparatus, be used for information reproduction from the various types of information carrier, or be used for information is recorded the various types of information carrier, it comprises two or more light sources with different wave length, the convergence apparatus of the beam convergence that makes each described light emitted to the described information carrier, the mobile device that the convergence luminous point of the described light beam that described convergence apparatus is assembled moves on the direction of described information carrier surface in perpendicular, the convergence condition detection apparatus of the signal of situation is assembled in output on described information carrier corresponding to described light beam, output is corresponding to the light summation pick-up unit of the signal of the reflection light quantity of described information carrier, and focus control device, be used for driving described mobile device according to the described output signal of described convergence condition detection apparatus, and control, make the convergence situation of described light beam on described information carrier constant substantially; When starting or restarting described optical disc apparatus, before driving described focus control device, has one of described light source of predetermined wavelength if connect, and driving described mobile device makes described convergence apparatus near leaving described information carrier then or leaving then near described information carrier, described optical disc apparatus is just distinguished, determine the type of the information carrier of described loading according to the signal of described light summation pick-up unit, if have the described light source of described predetermined wavelength and the Type-Inconsistencies of the information carrier of the described loading of having been distinguished, then connect another light source with different wave length, described optical disc apparatus is finally found out the consistent light source of type with the information carrier of described loading, drives described focus control device then.

Above-mentioned second kind of structure for second kind of optical disc apparatus according to the present invention, connecting wavelength is the laser instrument of 780nm, it is as the long light source of wavelength, be used for CD, CD-R, the light beam that this light source produces is by the convergent lens as convergence apparatus, the line convergence of going forward side by side, project loading as on the CD of information carrier.In addition, drive focus actuator, and measure the amplitude of the light summation signal of sending here from the light summation pick-up unit (AS) that when light beam shifts near or move apart CD, obtains as mobile device.Measured value and the predetermined value of distinguishing are compared,, determine that CD is CD, CD-R or SD to distinguish.If the CD that loads is CD, CD-R, then carry out the control of focus control and tracking immediately, read the information (TOC information etc.) on the CD, enter dormant state.If the CD that loads is SD rather than CD, then turn-off the light source of 780nm wavelength, connect another short wavelength's light source (for example 650nm).The light beam that light source is produced is assembled by the convergent lens as convergence apparatus, and project loading as on the CD of information carrier, carry out the control of focus control and tracking, read the information (control session information etc.) on the CD, enter dormant state.

The 3rd invention of the present invention is a kind of optical disc apparatus, be used for information reproduction from the various types of information carrier, or be used for information is recorded the various types of information carrier, it comprises two or more light sources with different wave length, the convergence apparatus of the beam convergence of each described light emitted to the described information carrier, the mobile device that the convergence luminous point that makes the described light beam that described convergence apparatus assembles moves on the direction of described information carrier surface in perpendicular, the convergence condition detection apparatus of the signal of situation is assembled in output on described information carrier corresponding to described light beam, the information signal amplitude of detection record on described information carrier or the reproducing signal pick-up unit of the signal amplitude that obtains of the envelope detected of described information, and focus control device, be used for driving described mobile device according to the described output signal of described convergence condition detection apparatus, and control, make the convergence situation of described light beam on described information carrier constant substantially; When starting or restarting described optical disc apparatus, before driving described focus control device, has one of described light source of predetermined wavelength if connect, and driving described mobile device makes described convergence apparatus near leaving described information carrier then or leaving then near described information carrier, described optical disc apparatus is just distinguished, determines the type of the information carrier of described loading according to the signal of described reproducing signal pick-up unit; If have the described light source of described predetermined wavelength and the Type-Inconsistencies of the information carrier of the described loading of having been distinguished, then connect another light source with different wave length, described optical disc apparatus is finally found out the consistent light source of type with the information carrier of described loading, drives described focus control device then.

For above-mentioned according to the present invention above-mentioned the third structure of the third optical disc apparatus, connecting wavelength is the laser instrument of 780nm, it is as the long light source of wavelength, be used for CD, CD-R, the light beam that this light source produces is by the convergent lens as convergence apparatus, the line convergence of going forward side by side, project loading as on the CD of information carrier.In addition, drive focus actuator, and measure the amplitude of the RF envelope signal of sending here from the reproducing signal pick-up unit (RFENV) that when light beam shifts near or move apart CD, obtains as mobile device.Measured value and the predetermined value of distinguishing are compared,, determine that CD is CD, CD-R or SD to distinguish.If the CD that loads is CD, CD-R, then carry out the control of focus control and tracking immediately, read the information (TOC information etc.) on the CD, enter dormant state.If the CD that loads is SD rather than CD, then turn-off the light source of 780nm wavelength, connect another short wavelength's light source (for example 650nm).The light beam that light source is produced is assembled by the convergent lens as convergence apparatus, and project loading as on the CD of information carrier, carry out the control of focus control and tracking, read the information (control session information etc.) on the CD, enter dormant state.

The 4th invention of the present invention is a kind of optical disc apparatus, be used for information reproduction from the various types of information carrier, or be used for information is recorded the various types of information carrier, it comprises the whirligig that rotates described information carrier, two or more light sources with different wave length, the convergence apparatus of the beam convergence of each described light emitted to the described information carrier, the mobile device that the convergence luminous point that makes the described light beam that described convergence apparatus assembles moves on the direction of described information carrier surface in perpendicular, and the convergence condition detection apparatus of the signal of situation is assembled in output on described information carrier corresponding to described light beam; Starting or restarting described optical disc apparatus and described whirligig when keeping not working, if connect each described light source, projection is corresponding to the light of described light source, and driving described mobile device makes described convergence apparatus near leaving described information carrier then or leaving then near described information carrier, described optical disc apparatus is just distinguished, according to the signal distinguishing that obtains from preset device whether described information carrier is arranged, wherein, the signal that obtains from described preset device is: the signal of (1) described convergence condition detection apparatus, (2) corresponding to the light summation signal of described formation carrier reflects light quantity, (3) be recorded in the information signal that information signal on the described information carrier or described information signal envelope detected obtain, or make up the signal that a plurality of signals obtain in these signals.

Above-mentioned the 4th kind of structure for the 4th kind of optical disc apparatus according to the present invention, when the spindle drive motor as CD rotating apparatus quits work, at first connect the laser instrument that wavelength is 780nm, by drive as the focus actuator of first mobile device with respect to disc upwards downwards (near or leave) move convergent lens as convergence apparatus, detect the amplitude of the convergence errors signal that when mobile, produces, light summation signal, RF signal etc.According to detected value, optical disc apparatus is distinguished, determines whether to be mounted with disc.Then, connect 650nm short wavelength's laser instrument, by drive as the focus actuator of first mobile device with respect to disc upwards downwards (near or leave) move convergent lens as convergence apparatus, detect the amplitude of the focus error signal that when mobile, produces, light summation signal, signal RF etc.According to detected value, optical disc apparatus is distinguished, determines whether to be mounted with disc.As mentioned above, utilize the different wavelength of laser device to distinguish.Therefore, if loaded disc, when laser instrument of excitation, detected amplitude becomes significantly, thereby can improve the degree of accuracy that detects and distinguish.In addition because spindle drive motor quits work, even short wavelength's laser projections to painted disc such as CD-R etc., also can be restricted to several microns or littler size that can error correction to luminous point, thereby avoid jeopardizing the problem of the data of record.In addition, because during distinguishing, hold the rotating disk sheet of disc and the anchor clamps of clamping disc and do not rotate, so if the infringement that rotating disk sheet and anchor clamps rotation may cause can prevent noise and not load disc the time.

The 5th invention of the present invention is a kind of optical disc apparatus, be used for information reproduction from the various types of information carrier, or be used for information is recorded the various types of information carrier, it comprises two or more light sources with different wave length, the convergence apparatus of the beam convergence that makes each described light emitted to the described information carrier, the mobile device that the convergence luminous point of the described light beam that described convergence apparatus is assembled moves on the direction of described information carrier surface in perpendicular, the convergence condition detection apparatus of the signal of situation is assembled in output on described information carrier corresponding to described light beam, detect the amplitude detecting device of amplitude of the described signal of described convergence condition detection apparatus, and focus control device, described output signal according to described convergence condition detection apparatus drives described mobile device, and control, make the convergence situation of described light beam on described information carrier constant substantially; When starting or restarting described optical disc apparatus, before driving described focus control device, make described convergence apparatus near leaving described information carrier then or leaving if drive described mobile device then near described information carrier, and connect each described light source, projection is corresponding to the light of the wavelength of described light source, just the signal storage that obtains from described amplitude detecting device under this emission situation to memory storage, described optical disc apparatus is distinguished, determine the type of the information carrier of described loading according to being stored in data in the described memory storage, described optical disc apparatus is found out the consistent light source of type with the information carrier of described loading, drives described focus control device then.

Above-mentioned the 5th kind of structure for the 5th kind of optical disc apparatus according to the present invention, connecting wavelength is the laser instrument of 780nm, it is as the long light source of wavelength, be used for CD, CD-R, the light beam that this light source produces is by the convergent lens as convergence apparatus, the line convergence of going forward side by side, project loading as on the CD of information carrier.In addition, drive focus actuator, and measure from assembling the amplitude of the focus error signal that when light beam shifts near or move apart CD, obtains (FE) that condition detection apparatus sends here as mobile device.The value that records is stored into as among the RAM in the DSP microprocessor of memory storage.Then, turn-offing wavelength is the light source of 780nm, connects another light source of wavelength short (for example 650nm).The light beam that this light source produces is by the convergent lens as convergence apparatus, and the line convergence of going forward side by side projects being used as on the CD of information carrier of loading.Drive focus actuator, and measure from assembling the amplitude of the focus error signal that when light beam shifts near or move apart CD, obtains (FE) that condition detection apparatus sends here.The value that records is stored into as among the RAM in the DSP microprocessor of memory storage.Relatively the amplitude of Cun Chu each FE signal is compared to each other, and carries out arithmetical operation, to distinguish, determines the type of institute's loading optical disk.According to the result who distinguishes, predetermined start-up parameter is set.Carry out the control of focus control and tracking, read the information (TOC information etc.) on the CD, enter dormant state.

The 6th invention of the present invention is a kind of optical disc apparatus, be used for information reproduction from the various types of information carrier, or be used for information is recorded the various types of information carrier, it comprises two or more light sources with different wave length, the convergence apparatus of the beam convergence that makes each described light emitted to the described information carrier, the mobile device that the convergence luminous point of the described light beam that described convergence apparatus is assembled moves on the direction of described information carrier surface in perpendicular, the convergence condition detection apparatus of the signal of situation is assembled in output on described information carrier corresponding to described light beam, output is corresponding to the light summation pick-up unit of the signal of the reflection light quantity of described information carrier, and focus control device, be used for driving described mobile device according to the described output signal of described convergence condition detection apparatus, and control, make the convergence situation of described light beam on described information carrier constant substantially; When starting or restarting described optical disc apparatus, before driving described focus control device, make described convergence apparatus near leaving described information carrier then or leaving if drive described mobile device then near described information carrier, and connect each described light source, projection is corresponding to the light of the wavelength of described light source, just the signal storage that obtains from described light summation pick-up unit under this emission situation to memory storage, described optical disc apparatus is distinguished, determine the type of the information carrier of described loading according to being stored in data in the described memory storage, described optical disc apparatus is found out the consistent light source of type with the information carrier of described loading, drives described focus control device then.

Above-mentioned the 6th kind of structure for the 6th kind of optical disc apparatus according to the present invention, connecting wavelength is the laser instrument of 780nm, it is as the long light source of wavelength, be used for CD, CD-R, the light beam that this light source produces is by the convergent lens as convergence apparatus, the line convergence of going forward side by side, project loading as on the CD of information carrier.In addition, drive focus actuator, and measure light summation signal (AS) amplitude of sending here from the light summation pick-up unit that when light beam shifts near or move apart CD, obtains as mobile device.The value that records is stored into as among the RAM in the microprocessor of memory storage DSP.Then, turn-offing wavelength is the light source of 780nm, connects another light source of wavelength short (for example 650nm).The light beam that this light source produces is by the convergent lens as convergence apparatus, and the line convergence of going forward side by side projects being used as on the CD of information carrier of loading.Drive focus actuator, and measure light summation signal (AS) amplitude of sending here from the light summation pick-up unit that when light beam shifts near or move apart CD, obtains.The value that records is stored into as among the RAM in the DSP microprocessor of memory storage.The amplitude of Cun Chu each AS signal relatively, and carry out arithmetical operation, to distinguish, determine the type of institute's loading optical disk.According to the result who distinguishes, predetermined start-up parameter is set.Carry out the control of focus control and tracking, read the information (TOC information etc.) on the CD, enter dormant state.

The 7th invention of the present invention is a kind of optical disc apparatus, be used for information reproduction from the various types of information carrier, or be used for information is recorded the various types of information carrier, it comprises two or more light sources with different wave length, the convergence apparatus of the beam convergence of each described light emitted to the described information carrier, the mobile device that the convergence luminous point that makes the described light beam that described convergence apparatus assembles moves on the direction of described information carrier surface in perpendicular, the convergence condition detection apparatus of the signal of situation is assembled in output on described information carrier corresponding to described light beam, the information signal amplitude of detection record on described information carrier or the reproducing signal pick-up unit of the amplitude of the signal that obtains of the envelope detected of described information, and focus control device, described output signal according to described convergence condition detection apparatus drives described mobile device, and control, make the convergence situation of described light beam on described information carrier constant substantially; When starting or restarting described optical disc apparatus, before driving described focus control device, make described convergence apparatus near leaving described information carrier then or leaving if drive described mobile device then near described information carrier, and connect each described light source, projection is corresponding to the light of the wavelength of described light source, just the signal storage that obtains from described reproducing signal pick-up unit under this emission situation to memory storage, described optical disc apparatus is distinguished, determine the type of the information carrier of described loading according to being stored in data in the described memory storage, described optical disc apparatus is found out the consistent light source of type with the information carrier of described loading, drives described focus control device then.

Above-mentioned the 7th kind of structure for the 7th kind of optical disc apparatus according to the present invention, connecting wavelength is the laser instrument of 780nm, it is as the long light source of wavelength, be used for CD, CD-R, the light beam that this light source produces is by the convergent lens as convergence apparatus, the line convergence of going forward side by side, project loading as on the CD of information carrier.In addition, drive focus actuator, and measure the amplitude of the RF envelope signal of sending here from the reproducing signal pick-up unit (RFENV) that when light beam shifts near or move apart CD, obtains as mobile device.The value that records is stored into as among the MRA in the DSP microprocessor of memory storage.Then, turn-offing wavelength is the light source of 780nm, connects another light source of wavelength short (for example 650nm).The light beam that this light source produces is by the convergent lens as convergence apparatus, and the line convergence of going forward side by side projects being used as on the CD of information carrier of loading.Drive focus actuator, and measure from the amplitude of the next RF envelope signal (RFENV) that when light beam shifts near or move apart CD, obtains of reproducing signal pick-up unit.The value that records is stored into as among the RAM in the DSP microprocessor of memory storage.The amplitude of Cun Chu each RFENV signal relatively, and carry out arithmetical operation, to distinguish, determine the type of institute's loading optical disk.According to the result who distinguishes, predetermined start-up parameter is set.Carry out the control of focus control and tracking, read the information (TOC information, control session information etc.) on the CD, enter dormant state.

The optical disc apparatus of the 8th invention of the present invention comprises makes the whirligig of information carrier with the desired speed rotation, assemble the convergence apparatus of the light beam on the described information carrier, make first mobile device of convergence luminous point to move on the direction that is basically perpendicular to described information carrier face of the described light beam of described convergence apparatus convergence, output is corresponding to the focusing-error detecting device of the signal of the convergence situation of described the above light beam of information carrier, described output signal according to described focusing-error detecting device drives described first mobile device, and control the substantially invariable focus control device of convergence situation of the described light beam that makes on the described information carrier, second mobile device that the described convergence luminous point of the described light beam that described convergence apparatus assembles is moved on the direction that is substantially perpendicular to described information carrier session, output is corresponding to the session error detecting apparatus of the signal that concerns between described light beam and the described session, and drive described second mobile device according to the described output signal of described session error detecting apparatus, and control, the described convergence luminous point that makes the described light beam on the described information carrier is suitably along the Electronic Traction Control System of described session scanning; When just starting described optical disc apparatus, after driving described whirligig, before described information carrier reaches desired speed, encourage described focus control device or described Electronic Traction Control System.

Above-mentioned the 8th kind of structure for the 8th kind of optical disc apparatus according to the present invention, before the rotating speed of the CD that is used as information carrier reaches predetermined value, promptly, before eccentric acceleration and oscillating acceleration change greatly, carry out the control of focus control and tracking, read the information (TOC, control tracking information etc.) on the CD.After rotating speed reaches predetermined value, enter dormant state.

The optical disc apparatus of the 9th invention of the present invention comprises makes the whirligig of information carrier with the desired speed rotation, assemble the convergence apparatus of the light beam on the described information carrier, make first mobile device of convergence luminous point to move on the direction that is basically perpendicular to described information carrier face of the described light beam of described convergence apparatus convergence, output is corresponding to the focusing-error detecting device of the signal of the convergence situation of described the above light beam of information carrier, described output signal according to described focusing-error detecting device drives described first mobile device, and control the substantially invariable focus control device of convergence situation of the described light beam that makes on the described information carrier, second mobile device that the described convergence luminous point of the described light beam that described convergence apparatus assembles is moved on the direction that is substantially perpendicular to described information carrier session, output is corresponding to the session error detecting apparatus of the signal that concerns between described light beam and the described session, and drive described second mobile device according to the described output signal of described session error detecting apparatus, and control, the described convergence luminous point that makes the described light beam on the described information carrier is suitably along the Electronic Traction Control System of described session scanning; If when beginning to start described optical disc apparatus, make with described whirligig described information carrier reached desired speed after described focus control device or described Electronic Traction Control System still can not work, then reduce the rotating speed of described whirligig, encourage described focus control device or described Electronic Traction Control System once more.

For above-mentioned the 9th kind of structure of the 9th kind of optical disc apparatus, with the CD of desired speed rotation as described information carrier according to the present invention.Under this rotating speed, insert the control of focus control and tracking.If access failure can not encourage the control of focus control and tracking, then reduce the rotating speed of disc, carry out the control of focus control and tracking once more.If under this rotating speed, encouraged the control of focus control and tracking, then read the information (TOC, control tracking information etc.) on the CD, enter dormant state.

The optical disc apparatus of the of the present invention ten invention comprises the whirligig of rotating information carrier, the gain conversions device of controlling the described rotating control assembly gain of rotating control assembly, conversion that described whirligig is rotated with desired speed, the rotation-speed measuring device of the described whirligig rotating speed of measurement, and rotating speed measurement mechanism switching time, be used for measuring the first predetermined rotating speed and bring up to the predetermined needed time of second rotating speed according to the measured value of described rotation-speed measuring device; Change described gain according to the described rotating speed value that measurement mechanism records switching time.

For the above-mentioned ten kind of structure of the tenth kind of optical disc apparatus, when being used as the CD of information carrier, measuring first rotating speed and bring up to the required time of second rotating speed with the desired speed rotation according to the present invention.According to the ride gain of the time conversion that records as the spindle drive motor of whirligig.

The optical disc apparatus of the 11 invention of the present invention comprise rotating information carrier whirligig, make the rotating speed of described conversion equipment be predetermined value rotating control assembly, change described rotating control assembly gain the gain modifier, measure described whirligig rotating speed rotation-speed measuring device, measure the described rotating speed that records becomes the time interval of second desired speed from first desired speed rotation change time interval measurement device according to the output of described rotation-speed measuring device; Described optical disc apparatus reaches the rotating speed required time according to described rotation change time interval measurement device described and judges and have or not described information carrier.

For above-mentioned the 11 kind of structure of the 11 kind of optical disc apparatus, when being used as the CD of information carrier, measuring first rotating speed and bring up to the required time of second rotating speed with the desired speed rotation according to the present invention.Determine whether to have loaded disc according to measured value.Therefore, can reach at the rotating speed of time of turning motor and motor in the cycle between time of predetermined value and determine to have or not disc, thereby can shorten the time of startup.

In the described optical disc apparatus, exchange described a plurality of light sources of different wave length with the order of the light source short from the long light source of ripple to wavelength.

Described optical disc apparatus is at first connected one of described light source of predetermined wavelength with low-power, after confirming that described information carrier is arranged power is brought up to predetermined extent.

In the described optical disc apparatus, the type of the described information carrier consistent with the longest described light source of wavelength is CD, CD-R or CD-RW.

In the described optical disc apparatus, described light source is the light source of long wavelength's light source and the described long wave length of wavelength ratio.

Description of drawings

Fig. 1 is the structured flowchart according to optical disc apparatus of the present invention;

Fig. 2 is the part block diagram according to photoelectric detector in the optical disc apparatus of the present invention;

Fig. 3 shows in detail traditional C D and is loaded into the portion waveshape that obtains when optical disc apparatus according to the present invention is gone forward side by side line focusing control;

Fig. 4 shows in detail novel high density CD and is loaded into the portion waveshape that obtains according to line focusing when control of going forward side by side in the optical disc apparatus of the present invention;

Fig. 5 is the process flow diagram according to the start-up course of first embodiment of the invention;

Fig. 6 is the process flow diagram according to the start-up course of second embodiment of the invention;

Fig. 7 is the process flow diagram according to the start-up course of third embodiment of the invention;

Fig. 8 is the curve map of disc oscillating acceleration and focus control open loop frequency characteristic;

Fig. 9 is the curve map of eccentric acceleration of disc and focus control open loop frequency characteristic;

Figure 10 is the process flow diagram according to the start-up course of fourth embodiment of the invention;

Figure 11 is the process flow diagram according to the start-up course of fifth embodiment of the invention;

Figure 12 is the curve map that changes relevant characteristic with spindle drive motor torque and start-up time;

Figure 13 is the detailed diagram according to spindle drive motor control section among Fig. 1 of sixth embodiment of the invention;

Figure 14 is the structured flowchart of the optical disc apparatus of the 5th to the 7th embodiment according to the present invention;

Figure 15 shows each traditional C D and novel high-density disk is loaded into according in the optical disc apparatus of the present invention, and the signal waveform of assembling and obtaining when throwing every kind of different wavelength of laser;

Figure 16 shows each traditional C D and novel high-density disk is loaded into according in the optical disc apparatus of the present invention, and the signal value of assembling and obtaining when throwing every kind of different wavelength of laser, these signal values are stored among the RAM, and Figure 16 also shows the feature level of these values.

Symbol description

1,780nm laser instrument

2,650nm laser instrument

3, laser control circuit

4, laser control circuit

5, coupled lens

6, coupled lens

7, the relevant polarizer of wavelength

8, polarization beam apparatus

9, driver

10, convergent lens

11, light beam

12, disc

13, spindle drive motor

14, main shaft control circuit

15, photoelectric detector

20, current/voltage switching amplifier

21, totalizer

22, comparer

23, phase comparator

24, low-pass filter

25, totalizer

26, totalizer

27, differential amplifier

28, low-pass filter

29, envelope detected circuit

30, AD converter

31, AD converter

32, AD converter

33, AD converter

34, digital signal processor (DSP)

35, DA converter

36, driving circuit

37, DA converter

38, driving circuit

41, gain-adjusted part

42, Hall equipment

43, comparer

Embodiment

Embodiments of the invention are described with reference to the accompanying drawings.In the drawings, the parts of identical function are represented with identical reference code.

Fig. 1 is the block diagram of optical disc apparatus, and it has two kinds of lasing light emitters of different wave length, and the disc of two or more types of playback different densities is such as CD and SD.

As shown in Figure 1, optical disc apparatus of the present invention has optical system, and light beam is projected on the disc 12 as information carrier.This optical system comprise the long wavelength lasing light emitter 1, the output light of light source 1 is converted to coupled lens 5, the short wavelength's of directional light lasing light emitter 2, the output light of light source 2 is converted to the relevant polarizer 7 of coupled lens 6, wavelength, polarization beam apparatus 8, driver 9, convergent lens 10, the laser control circuit 3 of control lasing light emitter 1 and the laser control circuit 4 of control lasing light emitter 2 of directional light.The signal of digital signal processor 34 is controlled lasing light emitter 1 and 2 by laser control circuit 3,4.

Coupled lens 5 becomes directional light to the Beam Transformation that laser instrument 1 produces.This directional light also by polarization beam apparatus 8, makes convergent lens 10 focusing and tracking direction on move forward into line convergence by driver 9 by the relevant polarizer 7 of wavelength, forms light beam spot on disc 12.

Use similar methods, the Beam Transformation that laser instrument 2 produces is become directional light by coupled lens 6.This directional light also by polarization beam apparatus 8, makes convergent lens 10 in focusing and tracking direction move forward into line convergence by driver 9 by the relevant polarizer 7 of wavelength, forms light beam spot on disc 12.Light beam 11a, the 11b that laser instrument 1,2 produces projects respectively on the disc 12 that is rotated by disc motor 13.According to the type of loading disc, select to use these two kinds of light beams.

When having loaded the disc of traditional density, for example CD and CD-R, then connecting wavelength according to the control signal of digital signal processor 34 by laser control circuit 3 is the lasing light emitter 1 of 780nm.When having loaded novel high-density disk, SD for example, then connecting wavelength according to the control signal of digital signal processor 34 by laser control circuit 4 is the lasing light emitter 2 of 650nm.

This optical disc apparatus is provided with four and cuts apart photoelectric detector 15, as receiving disc 12 catoptrical parts.In addition, the reflected light of disc 12 enters four and cuts apart photoelectric detector 15 by convergent lens 10 and polarization beam apparatus 8.Photoelectric detector 15 structures were illustrated by the cut-off rule among Fig. 2 in four minutes.Totalizer 21a is by current/ voltage switching amplifier 20a, and 20c produces the signal of expression two quadrature components (being A and C) sum.Totalizer 21b is by current/ voltage switching amplifier 20b, and 20d produces the signal of another expression two quadrature components (being B and D) sum.Difference signal by differential amplifier 27 obtains between these two signals wherein forms astigmatism, thereby obtains focus error signal FE.In addition, comparer 22a, 22b becomes binary signal to two conversion of signals of 4 quadrature component sums of expression respectively, phase comparator 23 is the phase place of each binary signal relatively, utilize the noise in 23 outputs of low-pass filter 24 filtering phase comparators, thereby obtain phase differential tracking signal TE (tracking error signal).

And totalizer 25 obtains four and cuts apart the summation that photoelectric detector 15 passages (detecting device) A to D goes up light quantity, and the signal of expression summation can pass through low-pass filter 28, to produce light summation signal AS.Totalizer 26 obtains the expression summation in a similar manner at high frequency band same signal carries out envelope detected to it, produces RF envelope detected signal RFENV.Signal to totalizer 26 carries out gain control, equilibrium etc., makes it become the signal that reads disc 12 information.But this is not directly related with the present invention, has therefore omitted further describing it.

Signal FE, the TE, AS and the RFENV that produce as mentioned above are input to digital signal processor (DSP) 34.Digital signal processor 34 receives FE or TE as input signal, and comprises the digital filtering operation that adds, delays time and take advantage of etc., thereby finishes the low-frequency gain compensation and the phase compensation of intersecting nakedness near gain, so that carry out focus control and tracking control.After this, digital signal processor 34 is delivered to driving circuit 36 to focus control signal by DA converter 35.Driving circuit 36 electric currents amplify the control signal that receives from DA converter 35, and signal is delivered to driver 9, to carry out focus control.In addition, digital signal processor 34 is delivered to driving circuit 38 to the tracking control signal by DA converter 37.Driving circuit 38 electric currents amplify the control signal that receives from DA converter 37, and this signal is delivered to driver 9, to carry out tracking control.

Distinguish the method for CD and SD when describing first to the 3rd embodiment start-up operation in detail, comprise the control of laser instrument according to the present invention below with reference to Fig. 1 and Fig. 2 and Fig. 3 and Fig. 4.Fig. 3 shows in the start-up operation of adorning CD, according to lasing light emitter 1 and 2 of connecting in turn of the present invention, and convergent lens 10 obtains when mobile up and down on focus direction during start-up operation when having loaded CD signal FE, AS and the waveform of RFENV and the waveform of the drive signal of driver 9 on focus direction.Fig. 4 shows in the start-up operation of adorning SD, connect in turn lasing light emitter 1 and 2 according to of the present invention, and convergent lens 10 signal FE, the AS and the waveform of RFENV and the waveform of the drive signal of driver 9 on focus direction that when focus direction moves up and down, obtain.

The structure of first embodiment is described below.As shown in Figure 3 and Figure 4, the characteristic of the long wavelength laser 1 of 780nm is applicable to CD, and the characteristic of the short wavelength laser 2 of 650nm is applicable to SD.Yet,, do not know to connect which laser instrument if CD and SD almost do not have difference on physical dimension.

In first embodiment, as shown in Figure 5, at first signal is delivered to laser control circuit 3 from DSP34, connect long wavelength's laser instrument 1 (step S1).Then, mobile convergence lens 10 (step S2) up and down.If loaded CD or CD-R this moment in device, then the amplitude of the last S shape signal that produces of FE will become greater than predetermined fiducial value, and as shown in Figure 3 (step S3, S4).According to this amplitude, the disc 12 that DSP34 detects loading is CD or CD-R, drives convergent lens 10 and is moved downward to extreme lower position, and moving up then, (step S5 S6), and detects the level (step S7) that FE goes up the S shape signal that produces.DSP34 starts wave filter work, so that focus on, and drive signal is delivered to DA converter 35, closed focus control loop (step S8).And, closed tracking control loop (step S9), (step 10) is carried out search operation, light beam is shifted to needed session, reads necessary information (TOC information etc.), enters dormant state (step S11) to read address information on the disc 12.

If do not load disc, then do not produce signal (step S 16), be defined as " no disc ", turn-off laser instrument, enter the state (step S17) of waiting for the sabot sheet.

Under the situation of high-density disk SD of having packed into, when connecting long wavelength laser, the amplitude of the S shape signal of the last generation of FE becomes less than predetermined value, (step S4) as shown in Figure 4.According to this amplitude, DSP34 determines that the disc 12 that loads is not CD or CD-R, drive convergent lens 10 to moving down into extreme lower position, send shutoff (OFF) signal to drive circuit for laser 3, send connection (ON) signal to drive circuit for laser 4, thereby turn-offing wavelength is the laser instrument 1 (step S12) of 780nm, and connecting wavelength is the laser instrument 2 (step S13) of 650nm.When convergent lens 10 moves up and down again under this state (step S14), the level of the S shape signal of the last generation of FE becomes and is higher than predetermined fiducial value (a) (step S15).(if this level is lower than predetermined value a, then enters the state of step S19 and S17).DSP34 detects this level, determines that the disc that loads is SD (step S18), drives convergent lens 10, makes it be moved down into its extreme lower position again.DSP34 drives convergent lens 10, make it move up again (step S20, S21), detect the level (step S22) that FE goes up the S shape signal that produces, start wave filter work, focus on, drive signal is delivered to DA converter 35, closed focus control loop (step S23).And closed tracking control loop (step S24) reads the address information (step S25) on the disc 12, carries out search operation, and the light velocity is moved on on the needed session, reads necessary information (control session information etc.), enters dormant state (step S26).In addition, in order to deal with the variations such as reflectance of disc, the S shape amplitude that produces during measurement moves down convergent lens 10 before the amplitude leyel that detects the S shape signal on the FE in the gain of DSP34 internal conversion multiplier (not shown) and attenuator (not shown), makes amplitude become predetermined amplitude.By said structure, can stably carry out focus control to CD and SD, can be not a lot of prolonging start-up time.

Below, second embodiment is described.

As the situation of first embodiment, as shown in Figure 3 and Figure 4, the long wavelength laser 1 of 780nm is applicable to CD, and the short wavelength laser 2 of 650nm is applicable to SD.Yet,, do not know to connect which laser instrument if CD and SD almost do not have difference on physical dimension.Therefore, as shown in Figure 6, at first signal is delivered to laser control circuit 3 from DSP 34, connect long wavelength's laser instrument 1 (step S1).Then, move up and down convergent lens 10 (step S2).If loaded CD or CD-R this moment in device, then the amplitude of the last U-shaped signal that produces of AS will become greater than predetermined fiducial value, and as shown in Figure 3 (step S3, S4).According to this amplitude, the disc 12 that DSP34 detects loading is CD or CD-R, drives convergent lens 10 and is moved downward to extreme lower position, and moving up then, (step S5 S6), and detects the level (step S7) that FE goes up the S shape signal that produces.DSP 34 starts wave filter work, so that focus on, and drive signal is delivered to DA converter 35, closed focus control loop (step S8).And, closed tracking control loop (step S9), (step 10) is carried out search operation, light beam is shifted to needed session, reads necessary information (TOC information etc.), enters dormant state (step S11) to read address information on the disc 12.

If do not load disc, then do not produce signal (step S16), be defined as " no disc ", turn-off laser instrument, enter the state (step S17) of waiting for the sabot sheet.

Under the situation of high-density disk SD of having packed into, the amplitude of the U-shaped signal of the last generation of AS becomes less than predetermined value, as shown in Figure 4 (step S4).According to this amplitude, DSP34 determines that the disc 12 that loads is not CD or CD-R, drive convergent lens 10 to moving down into extreme lower position, send shutoff (OFF) signal to drive circuit for laser 3, send connection (ON) signal to drive circuit for laser 4, thereby turn-offing wavelength is the laser instrument 1 (step S12) of 780nm, and connecting wavelength is the laser instrument 2 (step S13) of 650nm.When convergent lens 10 moves up and down again under this state (step S14), the level of the U-shaped signal of the last generation of AS becomes and is higher than predetermined fiducial value b.(if this level is lower than predetermined fiducial value b, then enters the state of step S19 and S17).DSP 34 detects this level, and (step S15 S18), determines that the disc that loads is SD, drives convergent lens 10, makes it be moved down into its extreme lower position again.DSP34 drives convergent lens 10, make it move up again (step S20, S21), detect the level (step S22) that FE goes up the S shape signal that produces, start wave filter work, focus on, drive signal is delivered to DA converter 35, closed focus control loop (step S23).And closed tracking control loop (step S24) reads the address information (step S25) on the disc 12, carries out search operation, and the light velocity is moved on on the needed session, reads necessary information (control session information etc.), enters dormant state (step S26).

In addition, in order to deal with the variations such as reflectance of disc, U-shaped amplitude on the AS that during measurement moves down convergent lens 10 before the amplitude leyel that detects the S shape signal on the FE, produces, to the gain of AS, make amplitude become predetermined amplitude at DSP34 internal conversion multiplier (not shown) or attenuator (not shown).And, by size, to the gain of FE, can stably carry out focus control to CD and SD at DSP internal conversion multiplier (not shown) or attenuator (not shown) according to the ratio of gains, can be a lot of prolonging start-up time.

The 3rd embodiment is described below.As first and second embodiment, as shown in Figure 3 and Figure 4, the characteristic of the long wavelength laser 1 of 780nm is applicable to CD, and the characteristic of the short wavelength laser 2 of 650nm is applicable to SD.Yet,, do not know to connect which laser instrument if CD and SD almost do not have difference on physical dimension.Therefore, as shown in Figure 7, at first signal is delivered to laser control circuit 3 from DSP 34, connect long wavelength's laser instrument 1 (step S1).Then, move up and down convergent lens 10 (step S2).If loaded CD or CD-R this moment in device, then the amplitude of the last V-arrangement signal that produces of RFENV will become greater than predetermined fiducial value, and as shown in Figure 3 (step S3, S4).According to this amplitude, the disc 12 that DSP34 detects loading is CD or CD-R, drives convergent lens 10 and is moved downward to extreme lower position, and moving up then, (step S5 S6), and detects the level (step S7) that FE goes up the S shape signal that produces.DSP34 starts wave filter work, so that focus on, and drive signal is delivered to DA converter 35, closed focus control loop (step S8).And, closed tracking control loop (step S9), (step 10) is carried out search operation, light beam is shifted to needed session, reads necessary information (TOC information etc.), enters dormant state (step S11) to read address information on the disc 12.If do not load disc, then do not produce signal, be defined as " no disc ", turn-off laser instrument, enter the state of waiting for the sabot sheet.

Under the situation of high-density disk SD of having packed into, when connecting long wavelength laser, the amplitude of the V-arrangement signal of the last generation of RFENV becomes less than predetermined value, as shown in Figure 4 (step S4).According to this amplitude, DSP34 determines that the disc 12 that loads is not CD or CD-R, drive convergent lens 10 to moving down into extreme lower position, send shutoff (OFF) signal to drive circuit for laser 3, send connection (ON) signal to drive circuit for laser 4, thereby turn-offing wavelength is the laser instrument 1 (step S12) of 780nm, and connecting wavelength is the laser instrument 2 (step S13) of 650nm.When convergent lens 10 moves up and down again under this state (step S14), the level of the V-arrangement signal of the last generation of RFENV becomes and is higher than predetermined fiducial value c (step S15).(if this level is lower than predetermined value c, then enters the state of step S19 and S17).DSP 34 detects this level, determines that the disc that loads is SD (step S18), drives convergent lens 10, makes it be moved down into its extreme lower position again.DSP34 drives convergent lens 10, make its (step S20 that moves up again, S21), detect FE and go up the level of the S shape signal that produces or the peak level (step S22) of RFENVE signal, start wave filter work, focus on, drive signal is delivered to DA converter 35, closed focus control loop (step S23).And closed tracking control loop (step S24) reads the address information (step S25) on the disc 12, carries out search operation, and the light velocity is moved on on the needed session, reads necessary information (control session information etc.), enters dormant state (step S26).

In addition, in order to deal with the variations such as reflectance of disc, V-arrangement amplitude on the RFENV that during measurement moves down convergent lens 10 before the peak level of amplitude leyel that detects the S shape signal on the FE or RFENV, produces, to the gain of RFENV, make amplitude become predetermined amplitude at DSP34 internal conversion multiplier (not shown) or attenuator (not shown).And, by size, to the gain of FE, can stably carry out focus control to CD and SD at DSP internal conversion multiplier (not shown) or attenuator (not shown) according to the ratio of gains, can be a lot of prolonging start-up time.

In above-mentioned first to the 3rd embodiment, when after the disc of determining loading is not CD or CD-R, connecting the laser instrument of 650nm wavelength, the emissive power of laser instrument is reduced to the information that to wipe on the CD-R, predetermined access level is set and corresponding to the gain of emissive power, after final definite disc that loads is not CD-R, make power turn back to its particular level.By such setting, the reliability of these embodiment can further improve.

In addition, can utilize this structure, make up the measured value of RFENV amplitude among the measured value of AS amplitude in the measured value, second embodiment of FE amplitude among first embodiment and the 3rd embodiment, they are carried out arithmetical operation, the difference of disk types is depended in generation, and according to the result of arithmetical operation, setting will be by the type of disc and the initial setting up value of laser type conversion.

And, in first to the 3rd embodiment of the present invention, as an example with two wavelength laser instrument that is 780nm and 650nm.Yet the present invention also can change by said process according to the order of sequence with three or more different wavelength of laser devices.And the present invention can be the laser instrument of 650nm or 635nm with wavelength also, and the long blue laser of short filter.Therefore the present invention is not limited to all these wavelength.

In addition,, then can convert long wavelength laser to short wavelength laser very fast, shorten start-up time if keep the excitation focus control.Especially,, then before conversion, in the focus control system, add and subtract an off-set value, just can obtain stable conversion if because the difference of substrate thickness etc. causes focal position to be offset a certain amount.

When such as disc carrier such as CD in the desktop PC time, disc is just by mechanical grip, and is loaded in the common box.Therefore, main shaft rotates if there is disc, and then the rotating disk sheet of spindle drive motor side may contact with anchor clamps on opposition side, thereby might produce noise or be damaged.

For addressing this problem, as embodiment 4, stop at spindle drive motor, promptly under the situation that the disc of Zhuan Zaiing is static, at first signal is delivered to laser control circuit 3 from DSP34, connect long wavelength's laser instrument 11.Then, move up and down convergent lens 10.If this moment, CD or CD-R were loaded in the optical disc apparatus, then as shown in Figure 3, even when disc is static, the amplitude that the amplitude of the S shape signal of the last generation of FE and AS go up the U-shaped signal that produces also becomes greater than their predetermined value.According to this situation, DSP determines that the disc 12 that loads is CD or CD-R.If signal level is less than their predetermined value, then DSP determines that the disc 12 that loads is SD, or does not load disc.DSP drives convergent lens 10, makes it move to its extreme lower position, sends cut-off signals to drive circuit for laser 3, sends connection signal to drive circuit for laser 4, is the laser instrument 1 of 780nm thereby turn-off wavelength, and connecting wavelength is the laser instrument 2 of 650nm.In this case, move down convergent lens 10 on.If the amplitude of the S shape signal of the last generation of FE and AS go up the amplitude of the U-shaped signal that produces and become greater than they predetermined values separately, then DSP34 determines that the disc that loads is SD.In addition, if the level of signal less than their predetermined value, then DSP 34 is defined as " no disc " and is loaded, and enters the state of waiting for disc carrier.

When being judged to be disc, DSP 34 makes the spindle drive motor rotation, carries out once more distinguishing according to one of first to the 3rd embodiment, with the type of definite disc, thereby can prevent that spindle drive motor is damaged, and can improve the accuracy of distinguishing.

As previously mentioned, various discs with identical appearance size have recently been proposed, disc for example of future generation and can write down CD, and standardization.Five, the 6th and the 7th embodiment relates to the practical methods of distinguishing with definite disk types.By these methods, can record information on the various discs or information reproduction from the various discs with a driver.Figure 14 is the structured flowchart of the 5th, the 6th and the 7th embodiment.These the 5th, the 6th also can equally with first to fourth embodiment use DSP 34 with the 7th embodiment, and finish with the program of the microcomputer 51 of the whole device of control.In addition, situation as Fig. 3 and Fig. 4 is the same, FE, the AS that each wavelength that Figure 15 shows emission individual layer SD, capacity that to be the laser of 780nm and laser projections that wavelength is 650nm be higher than CD to CD, density obtain when going up greater than the double-deck SD-W of CD and CD-RW (can write CD) and the waveform of RF signal.Below with reference to Figure 14 and Figure 15 the 5th, the 6th and the 7th embodiment is described.

The 5th embodiment is described below.When hypothesis is reset four types disc (for example traditional CD, SD, SD-W and CD-RW) according to the device of embodiment five, at first signal is delivered to laser control circuit 3 from DSP 34, connect long wavelength's laser instrument 1.Then, move up and down convergent lens 10.If loaded disc this moment in device, then upward the amplitude of the S shape signal of generation will be different with the type of disc for FE, as shown in figure 15.The amplitude of FE signal (maximum or minimum value) is presented to DSP 34 by AD converter 33, this value is sent to microcomputer (CPU) 51 by bus, CPU 51 stores the amplitude of the FE that obtains among its interior RAM into.FE amplitude during usually, only with long wavelength laser just can pick out CD and CD-R.After this, DSP 34 drives convergent lens 10 and is moved downward to extreme lower position, and move up then, and detect the level that FE goes up the S shape signal that produces, or the peak level of detection signal RFENV.DSP34 starts wave filter work, so that focus on, and drive signal is delivered to DA converter 35, closed focus control loop.And closed tracking control loop reads the address information on the disc 12, carries out search operation, light beam is shifted to needed session, reads necessary information (TOC information etc.), enters dormant state.

Under the situation that is not CD, CD-R, signal is sent to laser control circuit 4 from DSP 34, connect short wavelength's laser instrument 2.Then, move up and down convergent lens 10.The amplitude of the S shape signal of the last generation of FE is different with the type of disc, as shown in figure 15.The amplitude of the FE signal that this amplitude also obtains during long wavelength laser with projection is different.As wavelength is the situation of 780nm, the amplitude of signal FE (maximum or minimum value) is presented to DSP 34 by AD converter 33, this value is sent to microcomputer (CPU) 51 by bus, and CPU 51 stores the amplitude of the FE that obtains among its interior RAM into.

CPU51 carries out subtraction (owing to being easy to handle, so require subtraction basically to the FE value of storage on these wavelength.Yet this processing in the present invention is not limited to subtraction.), the result of subtraction is compared with the predetermined value of distinguishing, the type of determining the disc of current loading is SD, SD-W or CD-RW.

It is that the laser of 780nm and laser projections that wavelength is 650nm are to every type disc that Figure 16 shows wavelength, and moving up and down the amplitude of the signal that convergent lens obtains when obtaining oscillogram shown in Figure 15, Figure 16 also shows the value of distinguishing corresponding to this amplitude.Shown in Figure 15 and 16 (1), under the situation of SD (individual layer), the amplitude of FE when the 780nm is stored as SFE78, the amplitude of FE is stored as SFE65 during 650nm.Obtain difference between these amplitudes by subtraction, and compare with predetermined level FA and FB.If it is SD (individual layer) that this difference in the scope of FB to FA, then can identify disc.In addition, under the situation of SD-W (bilayer), the amplitude of FE is stored as DFE78 during 780nm, and the amplitude of FE is stored as DFE65 during 650nm.Obtain difference between these amplitudes by subtraction, and compare with predetermined level FB and FC.If it is SD-W (bilayer) that this difference in the scope of FC to FB, then can identify this disc.And under the situation of CD-RW, the amplitude of FE is stored as WFE78 during 780nm, and the amplitude of FE is stored as WFE65 during 650nm.Obtain difference between these amplitudes by subtraction, and compare with predetermined level FC.If it is CD-RW that this difference less than FC, then can identify this disc.

The 6th embodiment is described below.When hypothesis is reset four types disc (for example traditional CD, SD, SD-W and CD-RW) according to the device of embodiment six, as according to the situation of the device of the 5th embodiment, at first signal is delivered to laser control circuit 3 from DSP 34, connect long wavelength's laser instrument 1.Then, move up and down convergent lens 10.If loaded disc this moment in device, then upward the amplitude of the S shape signal of generation will be different with the type of disc for FE, as shown in figure 15.The amplitude of AS signal (maximum or minimum value) is presented to DSP 34 by AD converter 33, this value is sent to microcomputer (CPU) 51 by bus, CPU 51 stores the amplitude of the FE that obtains among its interior RAM into.AS amplitude during usually, only with long wavelength laser just can pick out CD and CD-R.After this, DSP 34 drives convergent lens 10 and is moved downward to extreme lower position, and move up then, and detect the level that FE goes up the S shape signal that produces, or the peak level of detection signal RFENV.DSP34 starts wave filter work, so that focus on, and drive signal is delivered to DA converter 35, closed focus control loop.And closed tracking control loop reads the address information on the disc 12, carries out search operation, light beam is shifted to needed session, reads necessary information (TOC information etc.), enters dormant state.Then, under the situation that is not CD, CD-R, signal is sent to laser control circuit 4 from DSP 34, connect short wavelength's laser instrument 2.Then, move up and down convergent lens 10.The amplitude of the U-shaped signal of the last generation of AS is different with the type of disc, as shown in figure 15.The amplitude of the AS signal that this amplitude also obtains during long wavelength laser with projection is different.As wavelength is the situation of 780nm, the amplitude of signal FE (maximum or minimum value) is presented to DSP 34 by AD converter 33, this value is sent to microcomputer (CPU) 51 by bus, and CPU 51 stores the amplitude of the FE that obtains among its interior RAM into.

CPU51 carries out subtraction (owing to being easy to handle, so require subtraction basically to the FE value of storage on these wavelength.Yet this processing in the present invention is not limited to subtraction.), the result of subtraction is compared with the predetermined value of distinguishing, the type of determining the disc of current loading is SD, SD-W or CD-RW.

As previously mentioned, it is that the laser of 780nm and laser projections that wavelength is 650nm are to every type disc that Figure 16 shows wavelength, and moving up and down the amplitude of the signal that convergent lens obtains when obtaining oscillogram shown in Figure 15, Figure 16 also shows the value of distinguishing corresponding to this amplitude.Shown in Figure 15 and 16 (2), under the situation of SD (individual layer), the amplitude of AS when the 780nm is stored as SAS78, the amplitude of AS is stored as SAS65 during 650nm.Obtain difference between these amplitudes by subtraction, and compare with predetermined level AA and AB.If it is SD (individual layer) that this difference in the scope of AB to AA, then can identify disc.In addition, under the situation of SD-W (bilayer), the amplitude of AS is stored as DAS78 during 780nm, and the amplitude of AS is stored as DAS65 during 650nm.Obtain difference between these amplitudes by subtraction, and compare with predetermined level AB and AC.If it is SD-W (bilayer) that this difference in the scope of AC to AB, then can identify this disc.And under the situation of CD-RW, the amplitude of AS is stored as WAS78 during 780nm, and the amplitude of AS is stored as WAS65 during 650nm.Obtain difference between these amplitudes by subtraction, and compare with predetermined level AC.If it is CD-RW that this difference less than AC, then can identify this disc.

The 7th embodiment is described below.When hypothesis is reset four types disc (for example traditional CD, SD, SD-W and CD-RW) according to the device of embodiment seven, as the same with the situation of the device of embodiment six according to embodiment five, at first signal is delivered to laser control circuit 3 from DSP 34, connect long wavelength's laser instrument 1.Then, mobile convergence lens 10 up and down.If loaded disc this moment in device, then produce RF as shown in figure 15.Yet, by envelope detected circuit 29, on the output signal RFENV of envelope detected circuit 29, producing the V-arrangement signal, the amplitude of V-arrangement signal is different with the type of disc.The amplitude of signal RFENV (maximum or minimum value) is presented to DSP 34 by AD converter 33, this value is sent to microcomputer (CPU) 51 by bus, CPU 51 stores the amplitude of the FE that obtains among its interior RAM into.Signal RFENV amplitude during usually, only with long wavelength laser just can pick out CD and CD-R.After this, DSP 34 drives convergent lens 10 and is moved downward to extreme lower position, and move up then, and detect the level that FE goes up the S shape signal that produces, or the peak level of detection signal RFENV.DSP34 starts wave filter work, so that focus on, and drive signal is delivered to DA converter 35, closed focus control loop.And closed tracking control loop reads the address information on the disc 12, carries out search operation, light beam is shifted to needed session, reads necessary information (TOC information etc.), enters dormant state.Then, under the situation that is not CD, CD-R, signal is sent to laser control circuit 4 from DSP 34, connect short wavelength's laser instrument 2.Then, move up and down convergent lens 10.The amplitude of the V-arrangement signal of the last generation of RFENV is different with the type of disc, as shown in figure 15.The amplitude of the signal RFENV that this amplitude also obtains during long wavelength laser with projection is different.As wavelength is the situation of 780nm, the amplitude of signal RFENV (maximum or minimum value) is presented to DSP 34 by AD converter 33, this value is sent to microcomputer (CPU) 51 by bus, and CPU 51 stores the amplitude of the FE that obtains among its interior RAM into.

CPU51 carries out subtraction (owing to being easy to handle, so require subtraction basically to the FE value of storage on these wavelength.Yet this processing in the present invention is not limited to subtraction.), the result of subtraction is compared with the predetermined value of distinguishing, the type of determining the disc of current loading is SD, SD-W or CD-RW.

It is that the laser of 780nm and laser projections that wavelength is 650nm are to every type disc that Figure 16 shows wavelength, and upwards moving down the amplitude of the signal that convergent lens obtains when obtaining oscillogram shown in Figure 15, Figure 16 also shows the value of distinguishing corresponding to this amplitude.Shown in Figure 15 and 16 (3), under the situation of SD (individual layer), the amplitude of RFENV when the 780nm is stored as SRF78, the amplitude of RFENV is stored as SRF65 during 650nm.Obtain difference between these amplitudes by subtraction, and compare with pre-value level RA and RB.If it is SD (individual layer) that this difference in the scope of RB to RA, then can identify disc.In addition, under the situation of SD-W (bilayer), the amplitude of RFENV is stored as DRF78 during 780nm, and the amplitude of RFENV is stored as DRF65 during 650nm.Obtain difference between these amplitudes by subtraction, and compare with predetermined level RB and RC.If it is SD-W (bilayer) that this difference in the scope of RC to RB, then can identify this disc.And under the situation of CD-RW, the amplitude during 780nm is stored as WFR78, and the amplitude during 650nm is stored as WFR65.Obtain difference between these amplitudes by subtraction, and also predetermined level RC compares.If it is CD-RW that this difference less than RC, then can identify this disc.

By making up the 5th, the 6th and the 7th embodiment, can improve the accuracy of distinguishing, can use various laser heads, also can in various discs, distinguish.For example, DSP 34 is configured to the amplitude of detection signal FE, AS, RFENV and TE, and the CPU storage is corresponding to all amplitudes of the laser instrument of every kind of wavelength.FE, RFENV when FE, the RFENV in the time of will removing the emission long wavelength laser with the AS amplitude of emission during short wavelength laser, the amplitude of TE and the value that obtains and the AS amplitude during with the emission long wavelength laser are removed the emission short wavelength laser, the amplitude of TE and the value that obtains compares promptly deduct the value of last acquisition from back one value that obtains.According to the gained result, distinguish, determine the type of disc.For this structure,, also can distinguish accurately even changed the reflectance of disc by being stained with dirt or dust thereon.

At read-only disc (ROM) with have under the situation of the CD-R (RAM) of leading line session and swinging signal with pit track, the S/N that the method for recommending detects session error signal (TEpp) than and amplitude on can produce difference, and the phase correlation method S/N that detects session error signal (TEph) than and amplitude also can produce difference.Therefore, by the excitation focus control, and the noise pulse width when detecting the amplitude of each signal TE or binary representation, can pick out ROM CD and RAM CD according to detected value.And FE goes up the level that crosses signal (line signal more) that produces in the time of also can crossing session according to light beam, distinguishes.

In addition, under the data conditions of not wiping on the CD-R (owing to reasons such as disc stops the rotation, laser power, wavelength), can project the light beam of the laser instrument of two long and short wavelength on CD and the CD-R, thereby the signal on all discs can be captured in these two kinds of wavelength the time.Adopt this structure, can distinguish disc by single job.

In above-mentioned these embodiment, playback CD (CD-R), D, SD-W and CD-RW disc have been described.Yet; be used for resetting in the device of two or more discs (comprise present adaptable PD, MO and MD and available DVD and high density MO etc. on the market) in the future being provided with two or more different wavelength of laser devices; by using these embodiment; and with the light source of suitable wavelength; can distinguish disc, protect disc simultaneously.

The same with the situation of the 4th embodiment as first to the 3rd embodiment, the 6th and the 7th embodiment narrates as example with the laser instrument of two wavelength 780nm and 650nm.Yet the present invention can change said process by order, is used for two or more different wavelength of laser devices.The present invention also can be used for the laser instrument that wavelength is 650nm or 635nm, and the shorter blue laser of wavelength.Therefore the present invention is not limited by wavelength fully.

In addition, in the superincumbent description, the amplitude of signal is stored among the built-in RAM of CPU.Yet if the capacity of the capacity of DSP and RAM is enough, these amplitudes also can be stored among the built-in RAM of DSP.In addition, if the storage lot of data then can be provided with the external RAM that DSP or CPU can accesses.

Below, with reference to Fig. 1 and Fig. 8 and Fig. 9 the 8th and the 9th embodiment is described, their start-up course has focus control and tracking control inserts feature regularly.Fig. 8 is the curve map of focus control open-loop gain characteristic, and disc oscillating acceleration characteristic.Fig. 9 is the curve that tracking is followed the tracks of open-loop gain feature and the eccentric acceleration characteristic of disc.

Situation about expressing as CD is the same, and spindle drive motor arrives time of desired rotating speed when operation start elongated along with the raising of playback speed (disc rotation speed).Along with the raising of rotating speed, the oscillating acceleration of disc and eccentric acceleration also with the increasing square pro rata of rotating speed.Shown in Fig. 8 and 9, if compare with the servocontrol open-loop gain, it is high that the acceleration of disc becomes, and then is difficult to insert the control of focus control and tracking.

Figure 10 shows the start-up course according to the device of the 8th embodiment.This process is described below.When disc carrier was gone into device, the microcomputer (not shown) was carried out setting up procedure and is controlled to carry out system, and spindle drive motor was connected (ON) order slave microcomputer to be sent to DSP34.After the spindle drive motor that receives microcomputer was connected order, DSP34 obtained connection signal from predetermined port, and started spindle drive motor 13 (step S1) by main shaft control circuit 14 (step S1).After obtaining this order, DSP34 carries out speed control according to the FG of spindle drive motor 13, makes the rotating speed of spindle drive motor 13 become predetermined value (step S2).Reach the needed time of desired speed in the scope of 500ms to 1500ms.During this period, the microcomputer adjoining land sends order to DSP34.According to these orders, and DSP34 connection laser instrument (step S2, S4), the connection focus control (step S5, S6, S7), the control of connection tracking (step S8, S9, S10, S11, S12).When beginning to insert focus control, owing to the laser turn-on time is several milliseconds, so the spindle drive motor rotating speed is not also brought up to predetermined value.At this moment, insert tracking control (step S5) immediately.Then, connect tracking control.Owing to insert the needed time of focus control in the scope of 200ms to 500mn, even when tracking control inserts beginning, the rotating speed of spindle drive motor still is lower than predetermined value.

Therefore, the eccentric acceleration of disc and oscillating acceleration falls into or approximate falling in the open-loop gain following range of all kinds of controls, the access of control can be because of failure.Specifically, under the situation of quite lacking the start-up time of spindle drive motor, control system is learnt, and promptly measures a tachometer value and brings up to the needed time of another tachometer value, and according to this time conversion driving gain (this is relevant with the 9th embodiment, will be described below).Present embodiment was configured between the learning period, inserted focus control and tracking control when predetermined rotating speed.

Figure 11 illustrates the start-up course according to the device of the 9th embodiment.This process is described below.In the time of in the disc carrier auto levelizer, carry out setting up procedure, to carry out system's control by microcomputer (not shown).Microcomputer is connected order to spindle drive motor and is sent to DSP34.After the spindle drive motor that receives microcomputer was connected order, DSP34 obtained connection signal from predetermined port, and started spindle drive motor 13 (step S1) by main shaft control circuit 14.After obtaining this order, DSP34 carries out speed control according to the FG of spindle drive motor 13, makes the rotating speed of spindle drive motor 13 become predetermined value (step S2).After the rotating speed of motor reaches predetermined value, and DSP34 connection laser instrument (step S3, S4, S5), the connection focus control (step S6, S7, S8), the control of connection tracking (step S9, S10, S11).At this moment, under and the situation that swing is less eccentric at disc, be not difficult to insert the control of focus control and tracking, desired session on the search disc reads necessary information, enter stand-by state (step S12, S13).Yet if swing and off-centre are bigger, it is big that oscillating acceleration and eccentric acceleration become, and just can not insert the control of focus control or tracking.Therefore, when DSP34 detect focus control insert make mistakes or tracking control insert and stagger the time (step S8, S11), just the rotating speed of target that passes to spindle drive motor be reset to than low value (for example, 1/2) (step S14, S15).Can detect focus control by the whole bag of tricks inserts and to make mistakes or tracking control inserts and makes mistakes.For example, usually be lower than its predetermined level or insert and make mistakes by finding not have the tracking error signal to detect focus control by the level of finding the RFENV signal.In addition, common binary signal counting by discovery tracking error signal reaches or detects tracking control access greater than predetermined value and make mistakes.

Utilize focus control to insert to make mistakes or tracking control connects error signal of a specified duration and detects at DSP34, so that rotating speed of target is turned down, thereby reduce after the rotating speed, move up and down convergent lens 10 once more, insert the control of focus control and tracking in succession.For example,, oscillating acceleration and eccentric acceleration are reduced to 1/4th, thereby even when swing and off-centre are big, also can control access operation by rotating speed is reduced by half.After the tracking access operation, search for desired session, rotating speed is brought up to predetermined value, carry out expectant control simultaneously, read necessary information, enter stand-by state (step S13).

The tenth embodiment of the present invention is described below.Figure 12 is the performance diagram of motor start-up torque and the variation of the start-up time when reaching a certain rotating speed.

As shown in figure 12, change and different with motor torque start-up time, and the variation of torque will cause the change in gain of Rotable Control System.Therefore, because of reasons such as interference can change rotating speed, in reproducing signal, produce shake.The tenth embodiment relates to a kind of learning method, to absorb the variation of rotary system.Figure 13 is spindle drive motor 13, main shaft control circuit 14 and a DSP34 detailed diagram shown in Figure 1.

When device starts the disc rotate command from CPU (not shown) when sending to DSP34, DSP34 sends rotate commands by main shaft control circuit 14 to spindle drive motor 13.Because spindle drive motor is provided with Hall device, has the signal FG (being 6 pulses in the present embodiment) of N pulse so each rotation produces, and offer DSP34.After signal FG is provided, become sometime value or more hour, DSP34 detects in the signal period, determine that motor stops or rotating.

And DSP34 calculates and is provided with the target period (target frequency) of FG with respect to the intended target rotational speed of CPU appointment, and drive signal is sent to spindle drive motor by main shaft control circuit 14, makes input signal FG have this cycle (step).Main shaft control circuit 14 has gain adjustment member 41, and predetermined gain is set when initial.

The method that the torque of study spindle drive motor changes is described below.As mentioned above, if the gain of the driving torque of motor and control circuit changes, then reach the needed time of a certain gyro frequency will change.Because the FG signal is offered DSP34, and the one-period of measuring-signal always, so that carry out frequency control, so can go out current rotating speed by cycle detection on the contrary.For example, measure rotating speed and bring up to the required time of 500rpm from 0rpm (halted state).Corresponding to Measuring Time, and the gain that is provided with in adjustment member 41 is stored in the ROM of DSP34, and it is for reference to make table value.On the other hand, obtain relational expression, the DSP34 core is carried out arithmetical operation, can obtain gain, and the gain of inserting in the DSP34 is provided with among the RAM.

As mentioned above, on gain adjustment member 41, obtain the value of setting the start-up time that is provided with according to spindle drive motor, can absorb adverse influences such as torque variation, backlash, friction, thereby can obtain stable rotation control.

Mention in the description to present embodiment in the above, measure rotating speed and bring up to the required time of 500rpm from 0rpm.Yet, just turn-offing and energized, or after the resetting during the device operation, spindle drive motor is because inertia continues rotation.Therefore, become 0 or stop the rotation by the time, then need long time to operate again if rotating speed is waited until by system.Change the required time if present embodiment is configured to measure between two rotating speeds, for example measure the required time, even then turn-offing and during energized, also can eliminate the stand-by period from 300rpm to 500rpm.Therefore, can measure startup (rotation change) time value A, B and the C of main shaft exactly.In addition, the playback speed by according to CD etc. can be arranged on the rotational speed of having known on 2, might know torque accurately, can carry out more stable control.And especially, by on 2 o'clock rotating speed being set, making is the twice of low speed at a high speed, can utilize software to handle simply, measures accurately.

In addition, have under the situation of various playback speed patterns (for example 8cm single face disc play mode and 12cm disc play mode and mode standard, 2 times of velocity modes and 8 times of velocity modes) at single assemblies such as for example CD players, by various disk types (diameter) or various playback speed are learnt, can obtain more stable rotation control system.

Utilize first to the 7th above-mentioned embodiment, when having protected the information that for example has been recorded on the CD-R, can carry out recording playback novel high-density disk.And the type of the disc that has loaded during with startup is irrelevant, can start into standby mode to optical disc apparatus, can identify disc immediately, is convenient to reproduce (record).Have bigger swing or eccentric disc even used, utilize the 8th embodiment, also can after firm start-up operation, before rotating speed is still low, insert focus control and tracking control, thereby can carry out high-speed starting and high-speed retrieval.Equally,, utilize the 9th embodiment, can reduce rotating speed, insert, rotating speed is returned to its predetermined value, thereby can guarantee high-speed retrieval when having bigger swing or eccentric disc when causing the control access failure owing to having used.And, used at 2 by utilization between the rotating speed change time with change and variation that the FG that carries out speed control measures motor torque, can understand motor exactly, and not raise the cost, can constitute the stable rotation control system.

According to the above embodiments four, by measuring the speed-raising time of motor, utilize measured value, can identify disc and whether exist.When not having disc, the inertia of motor is little, reaches desired speed fast, or becomes out of hand, thereby has prevented locking.Therefore, if the preset range that exceeds of the speed-raising time of motor then can be defined as not loading disc.Discern in this way and have or not disc to exist, can carry out two steps simultaneously, i.e. actuating motor, identification has or not disc to exist, thereby can shorten start-up time.

Show that above in the present invention, projecting laser and do not insert the control of focus control and tracking is discerned, and determines whether to have loaded high-density disk or super-high density disc.Convergent beam shines the time (several milliseconds or shorter) very short on the disc record face.Therefore, even owing to shone light beam one of information flag is lost, this mark of losing also can be corrected, and can not have problems when information reproduction.

In addition, in the present invention, the type of identification disc is simultaneously with the sequential firing laser of long wavelength laser to short wavelength laser.Therefore, short wavelength laser can not project (CD-R etc.) on the recording medium.Therefore, the CD that can reset and can not reset with a short wavelength laser can prevent that short wavelength laser from wiping the information on the record disc (for example CD-R).

In the present invention, also the device of high reproducing power (being used for the reproduction compatible apparatus such as discs such as CD-RW) is configured between above-mentioned recognition phase with low power transmissions.Therefore, though since identification error and short wavelength's laser projections to such as on the discs such as CD-R, also can prevent erasure information fully.

In addition, in the present invention, can have big swing or eccentric disc by high-speed replay.

In the present invention, also used at 2 by utilization between the rotating speed change time with change and variation that the FG that carries out speed control measures motor torque, can understand motor exactly, and not raise the cost, can constitute the stable rotation control system.

Therefore, generally speaking, the present invention can carry out high-speed retrieval to traditional disc (for example CD and CD-R) reliably, also can reproduce and record novel high-density disk reliably in the same way.

Claims (1)

1, a kind of optical disc apparatus comprises:

Whirligig makes the information carrier rotation according to predetermined rotational speed;

Convergence apparatus is assembled the light beam of described information carrier surface;

First mobile device perpendicular to the direction of described information carrier surface, moves the convergence zone of the described light beam of described convergence apparatus convergence according in fact;

Focusing-error detecting device is exported a focus error signal, and is corresponding with the convergence situation of the described light beam of described information carrier surface;

Focus control device drives described first mobile device according to the described focus error signal of described focusing-error detecting device, and realizes control, thereby makes the convergence situation of the described light beam on the described information carrier become basicly stable;

Second mobile device according to the direction that is basically perpendicular to the track on the described information carrier, moves the described convergence zone of the described light beam of described convergence apparatus convergence;

The trajectory error pick-up unit, output is corresponding to a trajectory error signal that concerns between described light beam and the described track;

The TRAJECTORY CONTROL device, the described trajectory error signal according to described trajectory error pick-up unit drives described second mobile device, and realizes control, thus the described convergence zone that makes the described light beam on the described information carrier is along described track scanning; Wherein,

When just starting described optical disc apparatus, before described information carrier reaches predetermined rotational speed, and after described whirligig is driven, start described focus control device or described TRAJECTORY CONTROL device; And

Insert and to make mistakes or described TRAJECTORY CONTROL device detects tracking control and inserts when makeing mistakes when described focusing-error detecting device detects focus control, be set to insert focus control and also insert tracking control after the low rotational speed that makes described information carrier reduces in target rotational speed by described whirligig.

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