CN1460251A - Optical disk device - Google Patents
Optical disk device Download PDFInfo
- Publication number
- CN1460251A CN1460251A CN02800855.3A CN02800855A CN1460251A CN 1460251 A CN1460251 A CN 1460251A CN 02800855 A CN02800855 A CN 02800855A CN 1460251 A CN1460251 A CN 1460251A
- Authority
- CN
- China
- Prior art keywords
- laser beam
- output
- rotational speed
- optical disc
- disc apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
An optical disk device in which the write output of the laser beam can be adequately set. The optical disk device (1) comprises a rotation drive mechanism for rotating an optical disk (2) loaded in the rotation drive mechanism at plural rotational speeds and an optical head (3) for irradiating the optical disk (2) with a laser beam so as to record information. While varying the output level of the laser beam stepwise, a trial of write of information on the optical information is carried out so as to determine the output of the laser beam for recording information on the optical disk (2). In order to determine the output of the laser beam corresponding to the rotational speed of the optical disk (2), a maximum output of the laser beam corresponding to the rotational speed of the optical disk (2) and a minimum output of the laser beam higher than zero are determined. The minimum variation unit of the output of the laser beam is the quotient of the division of the difference between the maximum and minimum outputs by a predetermined value, and the trial of write on the optical disk (2) is performed according to the quotient.
Description
Technical field
The present invention relates to optical disc apparatus.
Background technology
The optical disc apparatus that the CD that can carry out record reproducing to CD-R etc. carries out record reproducing is well-known.
This optical disc apparatus comprises: rotary drive mechanism is equipped with CD and it is rotated with multistage rotational speed (revolution); The shaven head (light picker), for the CD of described installation, by its radial direction movably mode be provided with, come recorded information (data) to the CD illuminating laser beam; And bare headed travel mechanism, be furnished with and make this shaven head at the sliding motor that moves in the radial direction.
Shaven head comprises: bare headed body (light picker body), be furnished with laser diode and split photodiode; Object lens are supported by pendulum spring, can carry out displacement (moving) respectively on the radial direction of CD and optical axis direction (turning axle direction) so that should the shaven head body; Focus actuator makes object lens at the enterprising line displacement of optical axis direction; And the tracking actuator, make object lens carry out displacement in the radial direction.
In such optical disc apparatus with information writing function, in fact the information of carrying out to write (record) preceding, need obtain the only recording power that is fit to characteristic and environmental baseline intrinsic on this CD (laser beam write output).
The situation of obtaining this only recording power is called OPC (Optimum Power Control; Best power control).In OPC, the output (laser output) that writes that is classified to change laser beam tries to write, and the laser output that wherein can optimumly write is defined as the laser output of suitable (optimum).
But in existing optical disc apparatus, when trying to write, therefore the output variable quantity of the laser beam when exporting with writing of 1 rank variation laser beam can not determine suitable laser output greatly accurately.
Particularly in existing optical disc apparatus, when trying to write, how the rotational speed of the output variable quantity CD of the laser beam when making the writing output and change with 1 rank of laser beam all fixes, but suitable laser output dependence is in the rotational speed of CD, for example, the rotational speed of CD is low more, suitable laser output is just low more, so when the rotational speed of CD is hanged down, with respect to the suitable laser output that will determine, the output variable quantity of the laser beam the when output of laser beam is changed with 1 rank increases, and can not determine accurately that suitable laser exports.
Summary of the invention
The object of the present invention is to provide a kind of optical disc apparatus, can reliably writing of laser beam be exported and be set at desired value, particularly, can both reliably writing of laser beam be exported and be set at desired value regardless of the rotational speed of CD.
To achieve these goals, optical disc apparatus of the present invention comprises the rotary drive mechanism that CD is installed and makes its rotation and can be with the shaven head of laser radiation recorded information to the CD, described CD write down or carry out record reproducing by described shaven head, it is characterized in that:
Make the output of described laser beam be classified to change and on described CD, try to write, the output of the laser beam when determining on described CD recorded information;
The output variable quantity of the laser beam the when output of described laser beam is changed with least unit is with the difference value of the minimum output valve of the maximum output valve of described laser beam and the described laser beam value divided by the setting gained,
Set the minimum output valve of described laser beam greater than 0.
Preferably when described examination is write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank is with the difference value of the minimum output valve of the maximum output valve of described laser beam and described laser beam n (n the is a natural number) value doubly divided by the value of setting gained.
Preferably when described examination is write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank be difference value with the minimum output valve of the maximum output valve of described laser beam and described laser beam divided by setting after the value of gained.
Another form of the present invention provides a kind of optical disc apparatus, comprise and CD is installed and makes it with the rotary drive mechanism of multistage rotational speed rotation and with the shaven head of laser radiation recorded information to the CD, described CD write down or carry out record reproducing by described shaven head, it is characterized in that:
Make the output of described laser beam be classified to change and on described CD, try to write, the output of the laser beam when determining on described CD recorded information;
The output variable quantity of the laser beam the when output of described laser beam is changed with least unit be the difference value of minimum output valve of the described laser beam set with the maximum output valve of described laser beam with according to the rotational speed of described CD divided by setting after the value of gained;
In the multistage rotational speed of described CD, at least in a rotational speed, the minimum output valve of the described laser beam that will set according to the rotational speed of described CD is set greater than 0.
Preferably when described examination is write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank be difference value with the minimum output valve of the maximum output valve of described laser beam and described laser beam divided by setting after n (n the is a natural number) value doubly of value of gained.
In this case, preferably how the rotational speed of the described CD of value of described n all fixes.
Preferably when described examination is write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank be difference value with the minimum output valve of the maximum output valve of described laser beam and described laser beam divided by setting after the value of gained.
Preferably the minimum output valve of the described laser beam that will set according to the rotational speed of described CD is set at 0 during minimum rotational speed in the multistage rotational speed of described CD.
Preferably the maximum output valve of described laser beam is set according to the rotational speed of described CD.
Preferably the rotational speed of described CD is set lowly more, and the maximum output valve of described laser beam is set to low more value.
Preferably the rotational speed of described CD is set lowly more, and the difference value of the maximum output valve of described laser beam and the minimum output valve of described laser beam is more little.
Preferably the rotational speed of described CD is set lowly more, and the output variable quantity of the laser beam when changing the output of described laser beam with least unit is more little.
Preferably how the rotational speed of the described CD of maximum output valve of described laser beam all fixes.
Preferably the rotational speed of described CD is set lowly more, and the minimum output valve of described laser beam is set to low more value.
How the rotational speed of the described CD of preferably described setting all fixes.
Another form of the present invention provides a kind of optical disc apparatus, comprise and CD is installed and makes it with the rotary drive mechanism of multistage rotational speed rotation and can be with the shaven head of laser radiation recorded information to the CD, described CD write down or carry out record reproducing by described shaven head, it is characterized in that:
Make the output of described laser beam be classified to change and on described CD, try to write, the output of the laser beam when determining on described CD recorded information;
The output variable quantity of the laser beam the when output of described laser beam is changed with least unit be the maximum output valve of the laser beam that will set according to the rotational speed of described CD divided by setting after the value of gained.
In this case, preferably when described examination is write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank be the maximum output valve of the laser beam that will set according to the rotational speed of described CD divided by setting after n (n the is a natural number) value doubly of value of gained.
Preferably how the rotational speed of the described CD of value of described n all fixes.
Preferably when described examination is write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank be the maximum output valve of the laser beam that will set according to the rotational speed of described CD divided by setting after the value of gained.
Preferably the rotational speed of described CD is set lowly more, and the maximum output valve of described laser beam is set to low more value.
How the rotational speed of the described CD of preferably described setting all fixes.
Another form of the present invention provides a kind of optical disc apparatus, comprise and CD is installed and makes it with the rotary drive mechanism of multistage rotational speed rotation and with the shaven head of laser radiation recorded information to the CD, described CD write down or carry out record reproducing by described shaven head, it is characterized in that:
Make the output of described laser beam be classified to change and on described CD, try to write, the output of the laser beam when determining on described CD recorded information;
The output variable quantity of the laser beam the when output of described laser beam is changed with least unit is set according to the rotational speed of described CD.
Preferably the rotational speed of described CD is set lowly more, and the variable quantity of the laser beam the when output of described laser beam is changed with least unit is just more little.
The output that preferably makes described laser beam changes with 15 grades level, and tries to write on described CD.
The adjustment digital-to-analog converter that preferably has the output variable quantity of adjusting described laser beam.
Preferably described adjustment digital-to-analog converter is for handling the digital-to-analog converter of 8 Bit datas.
Preferably carrying out described examination on the test zone of interior all side settings of described CD writes.
In following examples that the reference accompanying drawing carries out, purpose of the present invention, structure and effect outside above-mentioned will become clear and definite.
Description of drawings
Fig. 1 is the block scheme of the 1st embodiment of expression optical disc apparatus of the present invention.
Fig. 2 is the control operation process flow diagram of the control module that writes when output of the definite laser beam among the 1st embodiment of expression optical disc apparatus of the present invention.
Fig. 3 is the control operation process flow diagram of the control module that writes when output of the definite laser beam among the 2nd embodiment of expression optical disc apparatus of the present invention.
Embodiment
Below, the preferred embodiment shown in explains optical disc apparatus of the present invention with reference to the accompanying drawings.
Fig. 1 is the block scheme of the 1st embodiment of expression optical disc apparatus of the present invention.
Optical disc apparatus 1 shown in the figure is that CD (CD-R, CD-RW etc.) 2 is carried out the drive unit of record reproducing.
In CD 2, form not shown spiral helicine presetting slot (WOBBLE: swing).
This presetting slot crawled and advances with the cycle (is 22.05kHz when fast at 1 times) of regulation, write down ATIP (Absolute Time In Pre-Groove simultaneously in this presetting slot; Absolute time in the presetting slot) information (temporal information).In this case, atip information is by bi-phase modulated, and then carries out FM modulation and record with the carrier frequency of 22.05kHz.
This presetting slot has the function of the gathering sill of hole to CD 2/island when forming (hole/island record).In addition, this presetting slot can be used for resetting, the determining etc. of the rotational speed control of CD 2, the record position (absolute time) on the CD 2.
Optical disc apparatus 1 has the rotary drive mechanism that CD 2 is installed and it is rotated with multistage rotational speed (revolution).This rotary drive mechanism is mainly by the driver 23 of the spindle motor 11 of rotating disk rotation usefulness, drives spindle motor 11 and be fixed on the turning axle of spindle motor 11 and the not shown rotating disk of fixing disc 2 etc. constitutes.
In addition, optical disc apparatus 1 comprises: shaven head (light picker) 3, with respect to the CD 2 (rotating disk) of described installation, can move in the radial direction (radial direction of rotating disk) of CD 2; Shaven head travel mechanism makes this shaven head 3 move in the radial direction described; Control module (CPU) 9; RF amplifier IC40; Servo structure processor (DSP) 51; Demoder 52; Storer (for example, RAM etc.) 53; Card for laser control unit 54; And scrambler 55.Below, abbreviate the radial direction of described CD 2 as ' radial direction '.
Described bare headed travel mechanism mainly is made of sliding motor 7, the driver 22 that drives sliding motor 7, the straight-line not shown Poewr transmission mechanism etc. that makes the rotational delay transmission of sliding motor 7 and this rotation motion is changed into shaven head 3.
Shaven head 3 comprises: not shown bare headed body (light picker body), be furnished with the laser diode (light source) 5 and the split photodiode (light accepting part) 6 that produce laser beam; And not shown object lens (condenser lens).The driving of this laser diode 5 is by card for laser control unit 54 controls.
Card for laser control unit 54 has the D/A transducer (digital-to-analog converter) 541 of adjusting usefulness, adjusts the D/A transducer 541 of usefulness by this, the output variable quantity of the laser beam when adjustment makes the output of laser beam change with least unit.
Object lens are supported by the not shown pendulum spring that is provided with on the bare headed body (parts of energizing), with respect to bare headed body, can be respectively at optical axis direction (the turning axle direction of CD 2 (the rotating disk)) top offset of radial direction and object lens.Below, abbreviate the optical axis direction of described object lens as ' optical axis direction ', abbreviate the turning axle direction of described CD 2 as ' turning axle direction '.
With object lens be configured in predefined object lens on the bare headed body reference position (mid point), be on the middle position.Below, abbreviate the reference position of described object lens as ' reference position '.
If object lens depart from the reference position, then these object lens are energized to the reference position by the recuperability of pendulum spring.
In addition, shaven head 3 has the actuator 4 that makes object lens carry out displacement (moving) with respect to bare headed body.This actuator 4 by make object lens with respect to bare headed body at the tracking actuator 41 of radial direction top offset and object lens are constituted in the focus actuator 42 of optical axis direction (turning axle direction) top offset.
This actuator 4, promptly follow the tracks of actuator 41 and focus actuator 42 and drive by driver 21 respectively.
At OPC (Optimum Power Control; Best power control) in, write output (laser output) by what this control module 9 was determined the suitable laser beam corresponding with the rotational speed of CD 2.Have, the back will illustrate OPC again.
In this optical disc apparatus 1, connect external device (ED) (for example, computing machine) by coming illustrated interface control part detachable ground, can between optical disc apparatus 1 and external device (ED), communicate.
This optical disc apparatus 1 with the writing speed (writing speed) of data, when promptly writing data (signal) with respect to CD 2 rotational speed (revolution) of the CD 2 of (during record) be set at m the level (m is the integer more than 2) rotational speed.
For example, the rotational speed of CD 2 can be set at any one of 1 times of speed (minimum speed), 2 times of speed, 4 times of speed, 16 times of speed etc.
N doubly speed (N is the integer more than 2) is to be the N rotational speed doubly of this benchmark rotational speed of benchmark rotational speed (benchmark revolution) with 1 times of speed (minimum speed).
Below, the effect of optical disc apparatus 1 is described.
Optical disc apparatus 1 moves to target letter mark (destination address) with shaven head 3, in this target letter mark, carry out focus control, tracking Control, slip control and revolution control (rotational speed control), the information (data) to CD 2 of carrying out simultaneously writes (record) and reads (playback) from the information (data) of CD 2 etc.
When CD 2 identifying recording layers (signal), the presetting slot that forms on the CD 2 is reset (reading), then, come record data along this presetting slot.
By not shown interface control part, if the data (signal) of record on the CD 2 are input to optical disc apparatus 1, then these data are imported into scrambler 55.
In this scrambler 55, described data are encoded, with so-called EFM (Eight to FourteenModulation; Eight to 14 modulation) modulation system is modulated, and forms ENCORDE EFM signal.
This ENCORDE EFM signal is by the signal of the pulse formation of the length (cycle) of 3T～11T, is input to card for laser control unit 54 from scrambler 55.
In addition, the WRITE POWER signal (voltage) of simulating signal is exported from the not shown D/A transducer that is built in control module 9, is input to card for laser control unit 54.
Card for laser control unit 54 will switch to high level (H) and low level (L) and output from the level of the WRITEPOWER signal of controlling unit 9, thus the driving of the laser diode 5 of control shaven head 3 according to ENCORDE EFM signal.
Specifically, card for laser control unit 54 during the level of ENCORDE EFM signal is high level (H), make the level of WRITE POWER signal be high level (H) and output.That is, improve the output (formation writes output) of laser.Then, during the level of ENCORDE EFM signal was low level (L), the level that makes WRITE POWER signal was low level (L) and output.That is, reduce the output (turn back to and read output) of laser.
Thus, in CD 2, when the level of ENCORDE EFM signal is high level (H), writes the hole of specified length, and when the level of ENCORDE EFM signal is low level (L), write the island of specified length.
Like this, in the letter mark of the regulation of CD 2, write data (record).
Carry out record successively to the data of this CD 2 along presetting slot from interior all side direction outer circumferential sides.
In scrambler 55, except above-mentioned ENCODE EFM signal, also generate the ENCODE EFM signal (EFM signal at random) of regulation.This at random the EFM signal in determining the OPC that writes output (Optimum Power Control) of laser beam, be used for the output adjustment (power control) of the laser the when examination of test zone write.
The following describes OPC.At CD-R (Compact Disc-Recordable; Small-sized readable dish) in the CD 2, in interior all sides of program area, what have the ATIP specific information reads in zone, PMA (ProgramMemory Area; Program storage area), PCA (Power Calibration Area; Power calibration area) to be set successively from the such order of the inside all sides of outer circumferential side.PMA is the zone that writes of beginning, concluding time of letter mark etc.
In addition, PCA also further divides into test zone (Test Area) that tries to write and the counting region (Count Area) of writing down its count number.
In OPC, carry out test zone is tried to write.When test zone was tried to write, the described signal of EFM at random was input to card for laser control unit 54 from scrambler 55.In control module 9, generate the WRITE POWER signal of the level of 15 ranks (multi-level), the not shown D/A transducer of this WRITE POWER signal from be built in control module 9 is input to card for laser control unit 54.
Then, card for laser control unit 54 will switch to high level (H) and low level (L) and output, the driving of the laser diode 5 of control shaven head 3 thus from the WRITE POWER signal level of control unit 9 according to the described signal of EFM at random.WRITE POWER signal with 15 other level of level carries out this control respectively.
Like this, carry out the examination of test zone is write with 15 other outgoing laser beams of level (the output branch rank ground of laser beam is changed).This examination is write and can be carried out repeatedly (for example, 100 times).When whenever once trying to write, the mark that this examination of expression is write is set in the counting region.
In OPC, will be at random side-play amount between the waveform center of signal of the signal of 3T in the EFM signal and 11T when being made as β, in the 15 kind βs corresponding with other WRITE POWER signal of these 15 levels, to determine that (decision) is suitable laser output with the output (laser output) of the pairing laser beam of predefined setting β 0 (for example, 4%) immediate β.
That decides suitable laser beam like this writes output (laser output), and writes data with this laser output to CD 2.
Here, suitable laser output dependence is in the rotational speed of CD 2, and for example, the rotational speed of CD 2 is low more, and suitable laser output is confirmed as low more value.
Therefore, use in the D/A transducer 541 in the adjustment of card for laser control unit 54, before carrying out test zone examination write, if at first set the rotational speed of CD 2, then set the laser beam corresponding with this rotational speed maximum output valve A1 and with the minimum output valve B1 of the corresponding laser beam of this rotational speed, according to the difference of the minimum output valve B1 of the maximum output valve A1 of this laser beam and laser beam, the output variable quantity D1 of the laser beam when setting the output that makes laser beam and changing with least unit.
Conceptive, with the difference value of the minimum output valve B1 of the maximum output valve A1 of laser beam and laser beam divided by setting C1 after the value of gained be the output variable quantity D1 of the laser beam the when output of laser beam is changed with least unit.Below, the output variable quantity of the laser beam the when output that makes laser beam is changed with least unit abbreviates ' least unit variable quantity ' as.
In this optical disc apparatus 1, in multi-level rotational speed, at least in a rotational speed, the minimum output valve B1 of the laser beam that will set according to the rotational speed of CD 2 sets greater than 0.
But, the minimum output valve B1 of described laser beam preferably in the rotational speed of CD 2 minimum rotational speed (minimum speed), for example 1 times be set to 0 when fast.
Particularly the minimum output valve B1 of laser beam is set to 0 when the rotational speed of CD 2 is minimum, and when rotational speed in addition, preferably sets greater than 0.
In addition, the rotational speed of CD 2 is set lowly more, and the maximum output valve A1 of described laser beam and the minimum output valve B1 of laser beam are set to low more value respectively.
Here, preferably the difference value of the minimum output valve B1 of the maximum output valve A1 of laser beam and laser beam with the rotational speed of CD 2 set low more just more little the come maximum output valve A1 of setting laser bundle and the minimum output valve B1 of laser beam.That is, preferably the rotational speed of CD 2 is set lowly more, and the variable quantity D1 of least unit is more little.
Thus, in the rotational speed of all CDs 2,, can fully set the variable quantity D1 of least unit with respect to suitable laser output littlely.
Have, in the present embodiment, the maximum output valve A1 of laser beam sets according to the rotational speed of CD 2, but the invention is not restricted to this again, for example, also can be the rotational speed regardless of CD 2, and maximum output valve A1 is the structure of fixing.
Here, described setting C1 determines with the performance of D/A transducer 541 by handling to adjust.In the present embodiment, adjustment can be handled the data of 8 bits (256) with D/A transducer 541.That is, in the present embodiment, setting C1 for example is 256.
In addition, regardless of the rotational speed of CD 2, this setting C1 can fix.
Have again, in the present embodiment, adjust and to handle the data of 8 bits, but the invention is not restricted to this, for example, also can handle the data of 16 bits or the data of 4 bits with D/A transducer 541.
In the examination of test zone was write, the output variable quantity of the laser beam when 1 rank changes was n (n the is a natural number) value doubly of the variable quantity D1 of least unit.Have again, in the present embodiment, illustrate with n=1.
In addition, for example determine the value of described n when CD 2 is installed, regardless of the rotational speed of CD 2, the value of described n is all fixed, even fix in same rotational speed, but in the present invention, the value of n can not fixed yet yet.
As mentioned above, according to the rotational speed of CD 2, set the variable quantity D1 of least unit.Thus, in the rotational speed of all CDs 2, can determine suitable laser output accurately.
Playback time, laser beam shine the letter mark of the regulation of CD 2 from the laser diode 5 of shaven head 3.This laser beam is by CD 2 reflections, and this reflected light is subjected to light by the split photodiode 6 of shaven head 3.
From these split photodiode 6 outputs electric current corresponding with light income, this electric current is transformed to voltage by not shown I-V amplifier (current-voltage transformation component), from shaven head 3 outputs.
Be imported into RF amplifier IC40 from the voltage (detection signal) of shaven head 3 outputs, generate HF (RF) signal by carrying out additive operation and amplification etc. by this RF amplifier 40.This HF signal is and the hole and the island corresponding simulating signal that are written on the CD 2.
The HF signal is imported into servo control mechanism processor 51, carries out binarization by this servo control mechanism processor 51, carries out EFM (Eightto Fourteen Modulation; Eight to 14 modulation) demodulation, decoding (conversion) is the data (DATA signal) of prescribed form, and is imported into demoder 52.
Then, these data are decoded as the data of the prescribed form of communication (transmission) usefulness by demoder 52, by not shown interface control part, are sent to external device (ED) (for example, computing machine).
Tracking Control in the above replay operations, slip control, focus control and following the carrying out of revolution control.
As mentioned above, will be input to RF amplifier IC40 from the signal (voltage) after the current-voltage conversion of shaven head 3 split photodiode 6.
RF amplifier IC40 generates tracking error signal (TE) (voltage) according to from the signal after the current-voltage conversion of this split photodiode 6.
Tracking error signal is the signal of expression apart from bias size and its direction (apart from the side-play amount at letter mark center) of the object lens of the radial direction at letter mark center.
Tracking error signal is input to servo control mechanism processor 51.In servo control mechanism processor 51, for this tracking error signal, carry out the signal Processing of regulations such as the counter-rotating of phase place and amplification, generate tracking servo signal (voltage) thus.According to this tracking servo signal, be applied on the tracking actuator 41 by the driving voltage of driver 21 regulation, by driving this tracking actuator 41, object lens move to the center of letter mark.That is, make tracking servo generation effect.
Only in the driving of this tracking actuator 41, make object lens follow the tracks of the letter mark and have certain limit, in order to remedy this defective, by driver 22, drive sliding motor 7 bare headed body is moved to the identical direction of the direction that moves with described object lens, the control object lens are so that turn back to middle position (control of sliding).
In addition, RF amplifier IC40 generates focus error signal (FE) (voltage) according to from the signal after the current-voltage conversion of described split photodiode 6.
Focus error signal is expression apart from the signal of the bias size of the object lens of the optical axis direction (turning axle direction) of focusing position and its direction (apart from the side-play amount of the optical axis direction (turning axle direction) of the object lens of focusing position).
Focus error signal is input to servo control mechanism processor 51.In servo control mechanism processor 51, carry out the signal Processing of regulations such as the counter-rotating of phase place and amplification for this focus error signal, generate focus servo signal (voltage) thus.According to this focus servo mechanism signal, by driver 21, the driving voltage of stipulating is applied on the focus actuator 42, by driving this focus actuator 42, object lens are moved to focusing position.That is, make the generation effect of focus servo mechanism.
In addition, in servo control mechanism processor 51, generate the rotational speed (revolution) be used to control spindle motor 11 control signal (voltage), promptly the revolution with spindle motor 11 is the control signal of desired value, and is input to driver 23.
Be imported into spindle motor 11 from the described drive signal of driver 23 outputs, come drives spindle motor 11, make speed governing servomechanism generation effect, so that the revolution of spindle motor 11 reaches desired value (target revolution) according to this drive signal.
At above such speed governing servomechanism, be in the revolution control, set the target revolution of spindle motor 11, (servo (the CLV:Constant Linear Velocity of CLV that makes that the linear velocity on the CD 2 is fixed; Static line speed)).
Below, the control operation of the control module 9 when determining that the suitable laser corresponding with the rotational speed of CD 2 is exported (laser beam write output) is described.
Fig. 2 is the process flow diagram of the control operation of the control module 9 of expression when determining that the suitable laser corresponding with the rotational speed of CD 2 is exported.Below, illustrate according to this process flow diagram.
At first, CD 2 is installed on the optical disc apparatus 1, sets n=1 (step S101).
The rotational speed of the CD 2 in the time of then, will trying to write is set at doubly speed (step S102) of N.
Then, set the N doubly maximum output valve A1 of the laser beam of speed and the minimum output valve B1 (step S103, step S104) of laser beam by adjusting with D/A transducer 541, the maximum output valve A1 that exports according to this laser and the minimum output valve B1 of laser beam set the variable quantity D1 (step S105) of least unit.As mentioned above, the variable quantity D1 of this least unit be difference value (A1-B1) with the minimum output valve B1 of the maximum output valve A1 of laser beam and laser beam divided by setting C1 after the value of gained.
Then, with the rotational speed of the CD 2 after setting, be that N times of speed is come rotary CD 2 (step S106), test zone is tried to write (step S107).Have, as mentioned above, when examination was write, the output variable quantity of the laser beam when 1 rank is changed was set at the variable quantity D1 of least unit again.
Then, read the information of test zone having been carried out writing (examination is write), as mentioned above, obtain 15 kinds of β, wherein, will be defined as suitable laser output (step S108) with the output of the pairing laser beam of setting β 0 immediate β.
As described above, according to this optical disc apparatus 1, in the rotational speed of all CDs 2, can distinguish and determine suitable laser output reliably.
Thus, can carry out reading of the actual data that data write and this writes well.
Below, the 2nd embodiment of optical disc apparatus of the present invention is described.
Below, for the optical disc apparatus 1 of the 2nd embodiment, be that the center describes with difference with above-mentioned the 1st embodiment, for identical part, will omit its explanation.
In the optical disc apparatus 1 of the 2nd embodiment, use in the D/A transducer 541 in the adjustment of card for laser control unit 54, before test zone is tried to write, after at first setting the rotational speed of CD 2, set the maximum output valve A2 of the laser beam corresponding with this rotational speed, according to the maximum output valve A2 of this laser beam, the output variable quantity C2 of the laser beam when setting the output that makes laser beam and changing with least unit.Have, the rotational speed of CD 2 is set lowly more again, and the maximum output valve A2 of laser beam is set to low more value.
Conceptive, with the maximum output valve A2 of laser beam divided by setting B2 after the value of gained be the output variable quantity C2 of the laser beam the when output of laser beam is changed with least unit.Below, the output variable quantity of the laser beam the when output that makes laser beam is changed with least unit abbreviates ' variable quantity of least unit ' as.
Thus, the rotational speed of CD 2 is low more, can set the variable quantity C2 of least unit more little (thin more).
Here, described setting B2 determines with the handling property of D/A transducer 541 by adjusting.In the present embodiment, adjustment can be handled the data of 8 bits (256) with D/A transducer 541.That is, in the present embodiment, setting B2 for example is 256.
In addition, regardless of the rotational speed of CD 2, this setting B2 fixes.
Have again, in the present embodiment, adjust and to handle the data of 8 bits, but the invention is not restricted to this, for example can handle the data of 16 bits or the data of 4 bits with D/A transducer 541.
When the examination of test zone was write, the output variable quantity of the laser beam when 1 rank is changed was n (n the is a natural number) value doubly of the variable quantity C2 of least unit.Have again, in the present embodiment, illustrate with n=1.
In addition, for example determine the value of described n when CD 2 has been installed, regardless of the rotational speed of CD 2, the value of described n is all fixed, even also fix in same rotational speed, but in the present invention, the value of n also can be unfixed.
As mentioned above, according to the rotational speed of CD 2, set the variable quantity C2 of least unit.That is, the rotational speed of CD 2 is low more, sets the variable quantity C2 of least unit more little, so for example the rotational speed at CD 2 is low, when the output of suitable laser is low, set the variable quantity C2 of least unit low, thus, can determine suitable laser output accurately.
Below, the control operation of the control module 9 when corresponding with the rotational speed of the CD 2 suitable laser of decision is exported (laser beam write output) is described.
Fig. 3 is the process flow diagram of the control operation of the control module 9 of the expression decision suitable laser corresponding with the rotational speed of CD 2 when exporting.Below, describe according to this process flow diagram.
At first, CD 2 is installed on the optical disc apparatus 1, sets n=1 (step S201).
The rotational speed of the CD 2 in the time of then, will trying to write is set at doubly speed (step S202) of N.
Then, set the doubly maximum output valve A2 (step S203) of the laser beam of speed of N, set the variable quantity C2 (step S204) of least unit according to the maximum output valve A2 of this laser output by adjusting with D/A transducer 541.As mentioned above, the variable quantity C2 of this least unit be maximum output valve A2 with laser beam divided by setting B2 after the value of gained.
Then, with the rotational speed of the CD 2 after setting, be that N times of speed is come rotary CD 2 (step S205), test zone is tried to write (step S206).Have, as mentioned above, when examination was write, the output variable quantity of the laser beam when 1 rank is changed was the variable quantity C2 of least unit again.
Then, read the information of test zone having been carried out writing (examination is write), as mentioned above, obtain 15 kinds of β, wherein, will be defined as suitable laser output (step S207) with the output of the pairing laser beam of setting β 0 immediate β.
As described above, according to this optical disc apparatus 1, in the rotational speed of all CDs 2, can distinguish and determine suitable laser output reliably.
Thus, can carry out reading of the actual data that data write and this writes well.
More than, optical disc apparatus of the present invention has been described in accordance with the embodiments illustrated, but has the invention is not restricted to this that structure of each one can be replaced into the arbitrary structures with said function.
For example, optical disc apparatus of the present invention is not limited to carry out the device of record reproducing, also can be applied to write down special-purpose device.
In addition, optical disc apparatus of the present invention can be applied to multiple CD is write down or the various optical disc apparatus of record reproducing.
In addition, the optical disc apparatus of described embodiment is the device that can come rotary CD with a plurality of other rotational speeies of level, but optical disc apparatus of the present invention also can be the device that comes rotary CD with single rotational speed.
Utilize possibility on the industry
As described above, according to optical disc apparatus of the present invention, can be reliably with the output that writes of laser beam Be set at desired value.
Particularly regardless of the rotation speed of CD, can reliably the output that writes of laser beam be established Be decided to be desired value.
Claims (27)
1. optical disc apparatus comprises the rotary drive mechanism that CD is installed and makes its rotation and with the shaven head of laser radiation recorded information to the CD, described CD is write down or carries out record reproducing by described shaven head, it is characterized in that:
The output branch rank ground of described laser beam is changed and on described CD, try to write, the output of the laser beam when determining on described CD recorded information;
The output variable quantity of the laser beam the when output of described laser beam is changed with least unit is with the difference value of the minimum output valve of the maximum output valve of described laser beam and the described laser beam value divided by the setting gained;
Set the minimum output valve of described laser beam greater than 0.
2. optical disc apparatus as claimed in claim 1, wherein, when described examination was write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank was with the difference value of the minimum output valve of the maximum output valve of described laser beam and described laser beam n (n the is a natural number) value doubly divided by the value of setting gained.
3. optical disc apparatus as claimed in claim 1, wherein, when described examination was write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank was with the difference value of the minimum output valve of the maximum output valve of described laser beam and the described laser beam value divided by the setting gained.
4. optical disc apparatus, comprise and CD is installed and makes it with the rotary drive mechanism of multistage rotational speed rotation and with the shaven head of laser radiation recorded information to the CD, described CD write down or carry out record reproducing by described shaven head, it is characterized in that:
Make the output of described laser beam be classified to change and on described CD, try to write, the output of the laser beam when determining on described CD recorded information;
The output variable quantity of the laser beam the when output of described laser beam is changed with least unit is that the difference value of minimum output valve of the described laser beam set with the maximum output valve of described laser beam with according to the rotational speed of described CD is divided by the value of setting gained;
In the multistage rotational speed of described CD, at least in a rotational speed, the minimum output valve of the described laser beam that will set according to the rotational speed of described CD is set greater than 0.
5. optical disc apparatus as claimed in claim 4, wherein, when described examination was write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank was with the difference value of the minimum output valve of the maximum output valve of described laser beam and described laser beam n (n the is a natural number) value doubly divided by the value of setting gained.
6. optical disc apparatus as claimed in claim 5, wherein, how the rotational speed of the described CD of value of described n all fixes.
7. optical disc apparatus as claimed in claim 4, wherein, when described examination was write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank was with the difference value of the minimum output valve of the maximum output valve of described laser beam and the described laser beam value divided by the setting gained.
8. as claim 4 any one described optical disc apparatus to claim 7, wherein, the minimum output valve of the described laser beam that will set according to the rotational speed of described CD is set at 0 during minimum rotational speed in the multistage rotational speed of described CD.
9. as claim 4 any one described optical disc apparatus to claim 8, wherein, the maximum output valve of described laser beam is set according to the rotational speed of described CD.
10. as claim 4 any one described optical disc apparatus to claim 9, wherein, the rotational speed of described CD is set lowly more, and the minimum output valve of described laser beam is set to low more value.
11. as claim 4 any one described optical disc apparatus to claim 10, wherein, the rotational speed of described CD is set lowly more, the difference value of the minimum output valve of described laser beam and the minimum output valve of described laser beam is more little.
12. as claim 4 any one described optical disc apparatus to claim 11, wherein, the rotational speed of described CD is set lowly more, the output variable quantity of the laser beam the when output of described laser beam is changed with least unit is more little.
13. as claim 4 any one described optical disc apparatus to claim 8, wherein, how the rotational speed of the described CD of maximum output valve of described laser beam all fixes.
14. as claim 4 any one described optical disc apparatus to claim 13, wherein, the rotational speed of described CD is set lowly more, the minimum output valve of described laser beam is set to low more value.
15. as claim 4 any one described optical disc apparatus to claim 14, wherein, how the rotational speed of the described CD of described setting all fixes.
16. optical disc apparatus, comprise and CD is installed and makes it with the rotary drive mechanism of multistage rotational speed rotation and with the shaven head of laser radiation recorded information to the CD, described CD write down or carry out record reproducing by described shaven head, it is characterized in that:
Make the output of described laser beam be classified to change and on described CD, try to write, the output of the laser beam when determining on described CD recorded information,
The output variable quantity of the laser beam the when output of described laser beam is changed with least unit is the value of the maximum output valve of the laser beam that will set according to the rotational speed of described CD divided by the setting gained.
17. optical disc apparatus as claimed in claim 16, wherein, when described examination was write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank was n (n be natural number) doubly the value of the maximum output valve of the laser beam that will set according to the rotational speed of described CD divided by the value of setting gained.
18. optical disc apparatus as claimed in claim 17, wherein, how the rotational speed of the described CD of value of described n all fixes.
19. optical disc apparatus as claimed in claim 16, wherein, when described examination was write, the output variable quantity of the laser beam the when output of described laser beam is changed with 1 rank was the value of the maximum output valve of the laser beam that will set according to the rotational speed of described CD divided by the setting gained.
20. as claim 16 any one described optical disc apparatus to claim 19, wherein, the rotational speed of described CD is set lowly more, the maximum output valve of described laser beam is set to low more value.
21. as claim 16 any one described optical disc apparatus to claim 20, wherein, how the rotational speed of the described CD of described setting all fixes.
22. optical disc apparatus, comprise and CD is installed and makes it with the rotary drive mechanism of multistage rotational speed rotation and with the shaven head of laser radiation recorded information to the CD, described CD write down or carry out record reproducing by described shaven head, it is characterized in that:
Make the output of described laser beam be classified to change and on described CD, try to write, the output of the laser beam when determining on described CD recorded information,
The output variable quantity of the laser beam the when output of described laser beam is changed with least unit is set according to the rotational speed of described CD.
23. optical disc apparatus as claimed in claim 22, wherein, the rotational speed of described CD is set lowly more, and the variable quantity of the laser beam the when output of described laser beam is changed with least unit is just more little.
24. as claim 1 any one described optical disc apparatus to claim 23, wherein, the output that makes described laser beam changes with 15 grades level, and tries to write on described CD.
25., wherein, have the adjustment digital-to-analog converter of the output variable quantity of adjusting described laser beam as claim 1 any one described optical disc apparatus to claim 23.
26. optical disc apparatus as claimed in claim 25, wherein, described adjustment digital-to-analog converter is the digital-to-analog converter that can handle 8 Bit datas.
27., wherein, on the test zone of interior all side settings of described CD, carry out described examination and write as claim 1 any one described optical disc apparatus to claim 26.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001091254A JP2002288834A (en) | 2001-03-27 | 2001-03-27 | Optical disk apparatus |
| JP91254/2001 | 2001-03-27 | ||
| JP2001094067A JP2002298353A (en) | 2001-03-28 | 2001-03-28 | Optical disk device |
| JP94067/2001 | 2001-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1460251A true CN1460251A (en) | 2003-12-03 |
Family
ID=26612253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02800855.3A Pending CN1460251A (en) | 2001-03-27 | 2002-03-26 | Optical disk device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1460251A (en) |
| WO (1) | WO2002077982A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306491C (en) * | 2004-01-28 | 2007-03-21 | 日本胜利株式会社 | Method and apparatus for controlling recording power of a laser |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5642343A (en) * | 1990-06-29 | 1997-06-24 | Hitachi, Ltd. | Magnetooptic disc apparatus and recording medium |
| JPH09212866A (en) * | 1996-02-08 | 1997-08-15 | Taiyo Yuden Co Ltd | Power calibration method for write-once optical disk and optical disk recording and reproducing device |
| JPH1027346A (en) * | 1996-07-15 | 1998-01-27 | Hitachi Ltd | Information recording/reproducing device |
-
2002
- 2002-03-26 CN CN02800855.3A patent/CN1460251A/en active Pending
- 2002-03-26 WO PCT/JP2002/002930 patent/WO2002077982A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306491C (en) * | 2004-01-28 | 2007-03-21 | 日本胜利株式会社 | Method and apparatus for controlling recording power of a laser |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002077982A1 (en) | 2002-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1175407C (en) | Optical disk drive | |
| CN1152374C (en) | Device and method for automatically controlling laser diode power | |
| CN1162843C (en) | Disk-driving apparatus | |
| CN1348184A (en) | Recording apparatus and recording method | |
| US6839310B2 (en) | Optical disk drive having optical power control | |
| CN1198270C (en) | Optic information recording and reproducing device | |
| CN1251190C (en) | CD recording method of setting up optimal recording power for recording data and CD recording device | |
| CN1605097A (en) | Optical recording medium and recording device for this optical recording medium and recording method | |
| CN1207707C (en) | Light disk device and light disk recording method | |
| CN1633691A (en) | Signal processing apparatus and signal processing method | |
| CN1755809A (en) | Optical head, optical drive apparatus and method for generating tracking error signal | |
| CN1685426A (en) | Recording medium, recording device, reproduction device, recording method, and reproduction method | |
| CN1233044A (en) | Optical disc, tracking controlling apparatus and method, and focus controlling apparatus and method | |
| CN1327228A (en) | Disc driving equipment and method for producing swing information | |
| CN1147842C (en) | Disc driving device | |
| CN1249678C (en) | Optical disc recording equipment and method for forming image on disc | |
| CN1224015C (en) | Optical disc apparatus | |
| CN1157719C (en) | Optical record/playback device, pick-up, drice, track control and discs | |
| CN1299263C (en) | Disk drive and testing method for preset pit | |
| CN1181474C (en) | Optical disc apparatus | |
| CN1189872C (en) | Disk drive device | |
| CN1363126A (en) | Laser drive device, optical head and optical information processor | |
| CN1495733A (en) | Tracking control device and tracking control method thereof | |
| CN1670833A (en) | Disk drive device | |
| CN1146872C (en) | Light information recording method and apparatus thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |