CN100423092C - Optical disc apparatus with regulation of recording velocity and laser power - Google Patents

Optical disc apparatus with regulation of recording velocity and laser power Download PDF

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Publication number
CN100423092C
CN100423092C CNB2005101286647A CN200510128664A CN100423092C CN 100423092 C CN100423092 C CN 100423092C CN B2005101286647 A CNB2005101286647 A CN B2005101286647A CN 200510128664 A CN200510128664 A CN 200510128664A CN 100423092 C CN100423092 C CN 100423092C
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value
recording
laser power
characteristic
record
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CN1805021A (en
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松本圭史
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Yamaha Corp
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Yamaha Corp
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Abstract

Optical disc apparatus with regulation of recording velocity and laser power, a test recording is performed with respect to an optical disc prior to a regular recording, and a beta value for setting a qualitative parameter relating to the level of the recording state within a preferable range is derived from a result of the test recording. Then, the recording velocity at which the derived beta value or the writing laser power value is within the preferable value can be obtained. Therefore, the recording velocity at which the satisfactory recording can be realized with few recording errors can be determined. Further, a relation between a writing laser power value and a delta beta value is obtained from the reproduced signal from the test record area, and the writing laser power value is determined considering the delta beta value. Therefore, it is possible to determine the writing laser power value for performing a satisfactory recording even with the optical disc having a characteristic of a so-called beta significant point at which the beta value significantly changes with respect to the writing laser power value.

Description

Regulate the optical disc apparatus of writing speed and laser power
Technical field
The present invention relates to the video disc recording speed detecting method, be used to measure can be satisfactorily in for example small-sized CD-R of CD (CD-R) and the speed of recorded information in the writing optical disk (CD-RW) again.
The invention still further relates to CD and write the assay method of laser power, be used to measure can be satisfactorily for example small-sized CD-R of CD (CD-R) and again in the writing optical disk (CD-RW) recorded information write laser power value.
Background technology
As traditional for for example recording method of CD-R and digital versatile CD-R (DVD-R) of CD, with many times of linear velocities of overgauge linear velocity (one times of speed) (as, twice speed, four times of speed ... Deng) carry out high-speed record.
Be used for regulating and write laser power by changing so-called countermeasure according to the increase of writing speed, light application time, illumination zero-time etc., the recording error that can ignore writing speed separately thus carries out record.Yet the recording disk of some type does not satisfy the high-speed record requirement, so, when writing down with high speed, produce recording error most probably for these CDs.Also have, even can satisfy the record of the CD of high-speed record, the compatibility based on pen recorder and CD also can produce recording error sometimes.When this recording error occurring, the data field can not correctly be reproduced.
(OPC: the optimum write power of regulating laser beam) comprise: the presumptive area at CD before normal recordings is carried out test record with a plurality of writing speeds for the luminous power control of implementing; Acquisition can be carried out the laser power that writes of best titime in described test record speed.Yet, under the OPC situation, can not measure the favor speed scope that can actually write down.If can measure the optimal velocity for recording scope corresponding to the optical disc types of desire record with in the combination of the device of the enterprising line item of CD, then utilize corresponding CD and pen recorder in conjunction with suppressing recording error, thereby can carry out record in the short period of time.Yet the effective ways that a kind of mensuration can obtain satisfied writing speed scope also do not propose so far.
Write the method that laser power becomes the best as amplifying control according to writing speed, proposed to carry out the OPC method of best power control, this method comprises: carry out test record with a plurality of laser power values that write before normal recordings in the fate of CD; And obtain to write laser power value from the reproduction result of test recording area.
In traditional OPC, the signal that reproduces from test recording area obtains the β value characteristic that writes laser power value that indication writes relation between laser power value and the β value, and adopts the laser power value that writes corresponding to predetermined best value to write laser power value as the best.In addition, the β value is a parameter that relates to reproducing signal level or amplitude, can utilize (a+b)/(a-b) relational expression to obtain, wherein, letter a represents the peak level (have "+" number) of 8-14 modulation (EFM) signal waveform, as the light echo received signal of photo-detector, and the end level of b (have "-" number) expression return signal.
In addition, in traditional OPC, measure the laser power value that writes corresponding to predetermined best value.That is, only consider that the β pH-value determination pH writes laser power value.Yet, different and not simultaneously in the characteristic of CD along with its type, only consider β value and with simple mensuration write the laser power value record time quality level of recording status will be degenerated.For example, write relation between laser power value and the β value is normally linear, and is nonlinear relationship sometimes, and as shown in figure 49, this is because the rugged change of CD, due to the factors such as dyestuff unevenness.As shown in figure 29, in CD, β value and the relation that writes between the laser power value have linear characteristic basically, except part BT (in the described example, be near 10 in the β value, and write laser power value be near the 16mw).Write laser power value (for example 16mw) when writing down what adopt the β value available point BT that effectively changes corresponding to β value, can not obtain the recording status quality of being satisfied with sometimes for CD with this specific character.
Summary of the invention
The present invention considers above-mentioned situation, so first purpose of invention is to provide a kind of video disc recording speed detecting method, this method can be measured the writing speed that adopts the small records error to obtain satisfied record.Second purpose of the present invention is to provide a kind of CD to write the laser power method for measuring, is used for no matter how the type of recording disk all can obtain to make the laser power value that writes of recording error reduction.
In order to obtain first purpose, according to the present invention, provide a kind of method of determining the power that writes light beam that tracer signal is used on CD, comprise: recording step, by before physical record in the presumptive test district of CD tracer signal carry out test record; Reproduce step, from the presumptive test district reproducing signal of CD; Produce first recording characteristic according to reproducing signal, wherein said first characteristic is represented the characteristic of β value as the function that writes light beam power, and the β value is according to the amplitude acquisition of reproducing signal; Obtain second recording characteristic from first recording characteristic, wherein said second recording characteristic is represented the characteristic of Δ β as the function that writes light beam power, and Δ β representation unit writes the variation of the β value in first characteristic of quantity of power of light beam; Determining step uses the preferable range of Δ β to determine the recording power scope according to second recording characteristic that obtains, and the preferable range of this Δ β is scheduled to for realizing preferred record, thereby determines to write the power of light beam in the recording power scope; And determine to write the preferred power of light beam according to first recording characteristic and in the recording power scope.
Said method also comprises: produce the 3rd recording characteristic according to reproducing signal, the 3rd recording characteristic represents to write the relation between the power of light beam and in a plurality of qualitative parameter relevant with the characteristic of record at least one, and be the frequency of the frame synchronizing signal in detection is included in the reproducing signal of CD, the shake that is included in C1 error in the reproducing signal, reproducing signal, reproducing signal deviation, reproducing signal the percentage modulation laser beam from the parameter group that the amplitude of the reflectivity of CD and reproducing signal is formed, select; Wherein determining step comprises except second recording characteristic that is obtained and also determines the recording power scope according to the 3rd recording characteristic that is produced.
In said method, described recording step comprises the read-out speed reproducing signal of the signal writing rate with less than test record the time; Reproducing step comprises by carry out repeatedly the recovery time on the test section and reproduces the step of a plurality of signals; Described determining step comprises determines to be divided into upper side and than the recording power scope of downside, and described determining step also comprise with the preferred power that writes light beam determine determined recording power scope than downside within.
According to the present invention, also provide a kind of utilization to have the device that writes light beam tracer signal on CD of preferred power, this device comprises: the test record part, and described test record part is carried out the test record of signal in the presumptive test district of CD before physical record; Reproducing part is from the presumptive test district reproducing signal of CD; Produce part, described generation part produces first recording characteristic according to reproducing signal, and described first recording characteristic is represented the characteristic as the β value of the function that writes light beam power, and the β value is according to the amplitude acquisition of reproducing signal; Described generation part further produces second recording characteristic from first recording characteristic, wherein said second recording characteristic is represented the characteristic of Δ β as the function that writes light beam power, and Δ β representation unit writes the variation of the β value in first characteristic of quantity of power of light beam; And determining section, described determining section uses the preferable range of Δ β to determine the recording power scope according to second recording characteristic, and the preferable range of this Δ β is scheduled to for realizing preferred record, thereby determines to write the power of laser beam in the recording power scope; And determine to write the preferred power of light beam according to first recording characteristic and in the recording power scope.
According to a further aspect in the invention, provide a kind of utilization to have the device that writes light beam tracer signal on CD of preferred power, this device comprises: the test record part, and described test record part is carried out the test record of signal in the presumptive test district of CD before physical record; Reproducing part is from the presumptive test district reproducing signal of CD; Produce part, produce first recording characteristic according to reproducing signal, described first recording characteristic is represented the characteristic as the β value of the function that writes light beam power, and the β value is according to the amplitude acquisition of reproducing signal; Described generation part produces second recording characteristic from first recording characteristic, and described second recording characteristic is represented the characteristic as the Δ β of the function that writes light beam power, and Δ β representation unit writes the variation of the β value in first characteristic of quantity of power of light beam; Described generating unit branch produces the 3rd recording characteristic according to reproducing signal, described the 3rd recording characteristic represents to write the relation between the power of light beam and in a plurality of qualitative parameter relevant with the characteristic of record at least one, and is that the deviation of the frequency of the frame synchronizing signal in detection is included in the reproducing signal of CD, the shake that is included in C1 error in the reproducing signal, reproducing signal, reproducing signal, the percentage modulation laser beam that is added to laser beam are selected from the parameter group that the amplitude of the reflectivity of CD and reproducing signal is formed; And determining section, described determining section uses the preferable range of Δ β to determine the recording power scope according to second recording characteristic and the 3rd recording characteristic, the preferable range of this Δ β is scheduled to for realizing preferred record, thereby determines to write the power of light beam and according to first recording characteristic, second power characteristic and the 3rd power characteristic and determine to write the preferred power of light beam in the recording power scope in the recording power scope.
In accordance with a further aspect of the present invention, provide a kind of utilization that laser beam is write the method that CD is measured writing speed.The step that the inventive method adopted is, carry out the test record of signal in the booking situation district at CD before carrying out physical record with one or more writing speed levels, simultaneously from the fate of CD by the reading laser beam reproducing signal, and produce the first characteristic records speed according to reproducing signal, described first characteristic is represented the relation between the qualitative parameter of the optical characteristics of laser beam and signal record state, described optical characteristics or employing are from the β value representation of the reading laser beam acquisition of CD reflection, perhaps represent with writing laser beam, predetermined preferable range based on qualitative parameter produces second characteristic from first characteristic, and make second characteristic represent writing speed and, and the preferred value of measuring writing speed according to second characteristic and the preset range that becheduled for the optical signature that obtains preferred recording status corresponding to a kind of relation between the relationship characteristic scope of the predetermined preferable range of the qualitative parameter of recording status.
According to the present invention, carry out reference record for the CD that is subjected to normal recordings, and β value or write laser power value and be used for and will set qualitative parameter for the qualitative parameter of recording status level, described recording status level is obtained by test record speed.So, by the β value or to write the writing speed that laser power value obtains be available preferred value.So, can measure the writing speed that realizes satisfied record with little recording error.
In addition, above-mentioned method also comprises following step: corresponding to the preferable range of a plurality of qualitative parameters of polytype disc storage, under the test record situation, detect the type of CD, make the optical range of the step use of generation second characteristic, and measure the step of use corresponding to the preferable range of the optical signature of the type of detection of CD corresponding to the qualitative parameter of CD type of detection.
Also have, in described method, the step that produces first characteristic adopts the frequency that detects from by the frame synchronizing signal in the signal that is included in the CD signal reproduction, the one error C1 that in reproducing signal, comprises, one reproduces the dither signal of signal, one reproduces the deviation of signal, and one is added to the degree of modulation of laser beam, the selected qualitative parameter of group that laser beam is formed from the amplitude of the reflectivity of CD and reproducing signal.
According to the present invention, provide a kind of mensuration to be used for method with the power that writes light beam of signal record to the CD, method of the present invention is carried out by following step, before implementing record, to carry out test record to the signal in the presumptive test district of CD, and reproduce signal from the presumptive test district of CD, produce a recording characteristic according to the signal that is reproduced, expression Δ β and write relation between the power of light beam.Wherein Δ β represents that per unit writes the deviation of the quantity of power β value of light beam, and Δ β value to be amplitude error from reproducing signal obtain, and utilize the preferable range of Δ β to measure the preferable range that writes light beam according to the recording characteristic that is produced.Described power is for realizing that preferably record is scheduled to.
According to method of the present invention, the signal that reproduces before the test record obtains the relation between laser power value and the Δ β of writing as β value change amount, and consideration Δ β pH-value determination pH writes laser power value.So, can measure the laser power value that writes of the record of being satisfied with, even adopting the CD of the characteristic with so-called β available point also can measure, at described β a bit, for indivedual irregular products, for example rugged change and the uneven CD of dyestuff, β value change with respect to writing laser power value effectively.
In addition, according to the present invention, also provide the method for a kind of mensuration with the power that writes light beam of signal record on CD.The execution in step of the inventive method is, before physical record, carry out the method for testing of the power that writes light beam of test record for the signal in the presumptive test district of CD, presumptive test district reproducing signal from CD, produce recording characteristic according to reproducing signal, expression writes the relation between one of qualitative parameter of the power of light beam and relevant with the record amount at least recording characteristic, and from frequency by the frame synchronizing signal in the reproducing signal that is included in CD, be included in the C1 error in the reproducing signal, one reproduces the shake of signal, one reproduces the deviation of signal, one is added to the degree of modulation of laser beam, one laser beam is selected from the group that the reflectivity of CD and the amplitude of reproducing signal etc. are formed, and measures according to the recording characteristic that is produced used preferred power that writes light beam in physical record.
Write according to the present invention that it doesn't matter between laser power value and the β value, but write the relation between the laser power value parameter relevant with the recording quality level with at least one, the detection frequency of frame synchronizing signal for example, the C1 error need consider that from deviation and laser power value that the reproducing signal of test recording area obtains described relation is measured.So, can measure the laser power value that writes of the record of being satisfied with, even CD have so-called β available point characteristic also can, for indivedual different products for example rugged change and the dyestuff unevenness of CD, the β value can have effective change corresponding to writing laser power value at this.
In addition, according to the present invention, provide the measurement method that writes light beam power that tracer signal is used on CD.Method of the present invention comprises following step, in the step of carrying out test record for the signal in the presumptive test district at CD before the physical record, presumptive test district reproducing signal from CD, produce a recording characteristic according to reproducing signal, expression write light beam power and with recording characteristic and the β value that obtains from the amplitude error of reproducing signal, one detects the frequency of the frame synchronizing signal in the reproducing signal that is included in CD, one is included in the C1 error in the reproducing signal, one reproduces the shake of signal, one reproduces the deviation of signal, one is added to the degree of modulation of CD, relationship step between the qualitative test of one group selection of being formed from the reflectivity of the laser beam of CD and amplitude of reproducing signal etc., produce other recording characteristic according to reproducing signal, expression writes the power of light beam and the relation between other the qualitative test, and measures the preferred power that writes light beam that physical record is used according to the recording parameters that is produced.
According to method of the present invention, write the nature parameters of laser power value and two or more at least relevant recording qualities, β value for example, the detection frequency of frame synchronizing signal, the C1 error, relation between the shake, and obtain deviation from the reproducing signal of test recording area, determine to write laser power value by considering a plurality of parameters that relate to recording level.So, even CD has the characteristic of so-called β vital point, the laser power value that writes that also can determine to be satisfied with and write down, in described some parameters of point, for example the β value is because different products, as the rugged change and the dyestuff unevenness of CD, have effective change with respect to writing laser power value.
Description of drawings
Fig. 1 represents the block diagram of structure of the optical data recording/reproducing device of first embodiment of the invention.
Fig. 2 represents the synoptic diagram of test section, wherein utilizes optical data recording/reproducing device to carry out test record in CD.
Fig. 3 represents the block diagram as the function key structure of the controller of the structural detail of optical data recording/reproducing device.
Fig. 4 represents the key diagram by the deriving method of controller record maximal rate.
Fig. 5 represents the key diagram as the stored contents of the C1 error preferred value reservoir of the structural detail of controller.
Fig. 6 represents to utilize controller to write down the key diagram of the deriving method of maximal rate.
Fig. 7 represents the key diagram as the stored contents of the β preferred value reservoir of the structural detail of controller.
Fig. 8 represents the key diagram of switching time between the CAV operation of optical data recording/reproducing device and the CLV operation.
The process flow diagram of the control procedure of carrying out by controller when Fig. 9 is illustrated in the optical data recording/reproducing device record data.
Figure 10 represents to be write down by controller according to the improvement example of optical data recording/reproducing device the key diagram of the deriving method of minimum speed.
Figure 11 represents to be write down by controller according to the improvement example of optical data recording/reproducing device the key diagram of the deriving method of minimum speed.
Figure 12 is illustrated in the key diagram of the switching time between the CAV and CLV operation among the improvement embodiment of CD/transcriber.
Figure 13 A and 13B represent the key diagram by other deriving method of controller record maximal rate.
Figure 14 represents the key diagram by other deriving method of controller record maximal rate.
Figure 15 represents the block diagram of the formation that other improvement of optical data recording/reproducing device is routine.
Figure 16 represents other improvement example according to optical data recording/reproducing device, is write down the key diagram of the deriving method of maximal rate by controller.
Figure 17 represents the block diagram of formation of the improvement example of another optical data recording/reproducing device.
Figure 18 represents other improvement example according to optical data recording/reproducing device, is write down the key diagram of the deriving method of maximal rate by controller.
Figure 19 represents the block diagram of the formation that another improvement of optical data recording/reproducing device is routine.
Figure 20 represents another improvement example according to optical data recording/reproducing device, is write down the key diagram of the deriving method of maximal rate by controller.
Figure 21 A-21C represents to relate to the curve map that can be used for by relation between the parameter of the recording level of CD/transcriber derived record speed and the β value.
Figure 22 represents the block diagram as the functional structure of the controller of the structural detail of second embodiment of optical data recording/reproducing device.
Figure 23 represents the key diagram as the stored contents of the β preferred value information memory of the structural detail of controller.
Figure 24 represents the synoptic diagram of an example of β value that is used for each laser power value that the test record undertaken by optical data recording/reproducing device obtains and C1 error.
Figure 25 represents from writing the best key diagram that writes the process of laser power value of relation mensuration between laser power value and the β value.
Figure 26 represents the key diagram as the stored contents of the C1 error preferred value information memory of the structural detail of controller.
Figure 27 represents to measure the best key diagram that writes the process of laser power value from the relation that writes between laser power value and the C1 error amount.
Figure 28 represents the process flow diagram of the process that another optical data recording/reproducing device was carried out by controller in writing time.
Figure 29 is illustrated in the improvement example of optical data recording/reproducing device and detects the key diagram that frequency measurement the best writes the process of laser power value from writing laser power value and frame synchronizing signal.
Figure 30 is illustrated in other improvement example of optical data recording/reproducing device, measures the best key diagram that writes the process of laser power value from the relation that writes between laser power value and the jitter value.
Figure 31 is illustrated in other improvement example of optical data recording/reproducing device, measures the best key diagram that writes the process of laser power value from the relation that writes between laser power value and the deviate.
Figure 32 is illustrated in other improvement example of optical data recording/reproducing device, measures the best key diagram that writes the process of laser power value from the relation between the range value that writes laser power value and RF signal.
Figure 33 is illustrated in other improvement example of optical data recording/reproducing device, measures the best key diagram that writes the process of laser power value from the relation that writes between laser power value and the degree of modulation.
Figure 34 is illustrated in other improvement example of optical data recording/reproducing device, measures the best key diagram that writes the process of laser power value from the relation that writes between laser power value and the reflectivity.
Figure 35 is illustrated in other improvement example of optical data recording/reproducing device, measures the best key diagram that writes the process of laser power value.
Figure 36 represents the block diagram according to the process of the optical data recording/reproducing device of third embodiment of the invention.
Figure 37 represents the block diagram as the functional structure of the controller of the structural detail of the optical data recording/reproducing device of the 3rd embodiment.
Figure 38 represents to write in the optical data recording/reproducing device according to the 3rd embodiment between laser power value and the C1 error amount relation and measures the best key diagram that writes the process of laser power value.
Represent Figure 39 to write in the optical data recording/reproducing device according to the 3rd embodiment laser power value and frame synchronizing signal detect between the frequency relation and measure the best key diagram that writes the process of laser power value.
Represent Figure 40 to write in the optical data recording/reproducing device according to the 3rd embodiment laser power value and frame synchronizing signal detect between the frequency values relation and measure the best key diagram that writes the process of laser power value.
Figure 41 represents to write in the improvement example according to the optical data recording/reproducing device of the 3rd embodiment between laser power value and the C1 error amount relation and measures the best key diagram that writes the process of laser power value.
Figure 42 represents to write in the improvement example according to the optical data recording/reproducing device of the 3rd embodiment between laser power value and the C1 error amount relation and measures the best key diagram that writes the process of laser power value.
Represent Figure 43 to write in the improvement example according to the optical data recording/reproducing device of the 3rd embodiment laser power value and frame synchronizing signal detect the key diagram that relation between the frequency is measured the improvement example of the best process that writes laser power value.
Figure 44 represents to write in the improvement example according to the optical data recording/reproducing device of the 3rd embodiment that relation between laser power value and the frame synchronization detection signal frequency measures the best process that writes laser power value that other improves the key diagram of example.
Figure 45 represents according to fourth embodiment of the invention, as the block diagram of the functional structure of the controller of the structural detail of optical data recording/reproducing device.
Figure 46 represents according to the 4th embodiment, write laser power value and β value that the test record undertaken by optical data recording/reproducing device obtains between the instance graph of relation.
Figure 47 represents according to the 4th embodiment, concerns the best key diagram that writes the process of laser power value of mensuration between laser power value and the Δ β value from writing in optical data recording/reproducing device.
Figure 48 represents according to the 4th embodiment, measures the best key diagram that writes the process of laser power value in the improvement example of optical data recording/reproducing device.
Figure 49 represent to write laser power value and the β value that obtains from the reproducing signal of the test section of carrying out test record at CD between concern illustrate figure.
Embodiment
Below quoted figures is illustrated embodiments of the invention.
A-1. the structure of first embodiment
At first, Fig. 1 represents the schematic block diagram according to the optical data recording/reproducing device structure of the first embodiment of the present invention.As shown in Figure 1, optical data recording/reproducing device comprises optical receiver 10, Spindle Motor 11, RF amplifier 12, servo circuit 13, address detection circuit 14, demoder 15, controller 16, scrambler 17, countermeasure circuit 18, laser driver 19, laser power control circuit 20, frequency generator 21, envelope detected circuit 22, C1 error-detector circuit 23 and β testing circuit 24.Spindle Motor 11 is motors that a rotation/driving is used for CD (as the CD-R) D of record data.Optical receiver 10 has a laser diode, an optical system, for example lens and reflective mirror, and a back light receiving element.Optical receiver with laser beam irradiation CD D, and receives the light that returns from CD D at record with when reproducing, and the RF signal that will be subjected to 8-14 modulation (EFM) outputs to RF amplifier 12 as light receiving signal.In addition, optical receiver 10 has the supervision diode, and the light that is returned by CD D produces electric current in diode, and described electric current is added on the laser power control circuit 20.
RF amplifier 12 amplifies for signal that provide from optical receiver 10 and that be subjected to the EFM modulation, and the RF signal that amplifies is outputed to servo circuit 13, address detection circuit 14, envelope detected circuit 22, β testing circuit 24 and demoder 15.Demoder 15EFM-modulation provides through the EFM-modulated RF signal by RF amplifier 12 and produce the data of reproduction when reproducing.
On the other hand, when record, the demoder 15 RF signal that the EFM-modulation provides from RF amplifier 12 when reproducing test recording area, described C1 error-detector circuit 23 detects the C1 error according to restituted signal, and exports this error to controller.Described C1 error-detector circuit 23 is utilized to be called and is intersected the error correction code that reads Solomon sign indicating number (CIRC) and make the EFM restituted signal be subjected to error correction, and the frame number of detection inexecutable first error correction in a sub-code frame (98EFM frame), that is the frequency of C1 error.
When writing down, the process of optical data recording/reproducing device of the present invention is, before normal record, make the presumptive area (see figure 2) on the inner circumferential side of CD D be subjected to test record, and obtain a writing speed, in this speed with respect to the record that based on the reproduction result of test recording area, can be satisfied with.Described C1 error-detector circuit 23 detects the C1 error of the reproducing signal of test recording area, and exports error to controller 16.
Here.The test section that is used to carry out the test record of CD D (CD-R) referring to Fig. 2 explanation.The zone of CD D that based on diameter is 46-50mm is as guiding area 114, and is used for the program area 118 of record data and the outer circumferential sides that remaining area 120 is positioned at guiding area.On the other hand, also has inner circumferential side power calibration district (PCA) 112.Described inner circumferential side PCA district 112 comprises a test section 112a and a count block 112b.Described test section 112a crosses the Cheng Qian in normal recordings and is subjected to test record.Here, test section 112a is made in the district that can carry out the substantive test record, and indicating section is recorded in the 112b of count block at the EFM signal of the test section of the end of test record end record 112a.So, when CD D is subjected to test record, read the EFM signal of count block 112b.Then, can obtain the position that desire is carried out the test section 112a of test record.In optical data recording/reproducing device of the present invention, be subjected to test record in normal recordings Pretesting district 112.
Again referring to Fig. 1, the swinging signal component is provided from the EFM signal that is provided by RF amplifier 12 address detection circuit 14, and indication is included in the temporal information of each position in the swinging signal component, the information of identification dish and disc-type, for example the information of Pan dyestuff is decoded, and information is outputed to controller 16.
Described β testing circuit 24 calculates the parameter of β (symmetry) values as the reproducing signal level that the EFM modulated RF signal that provides from RF amplifier 12 is provided when test recording area reproduces, and exports result of calculation to controller 16.The β value determined by (a+b)/(a-b), and wherein, alphabetical b represents to be subjected to the peak value (symbol+) of the signal waveform of EFM modulation, and alphabetical b represents the end level (symbol-) of signal waveform.
The envelope of the EFM signal of the count block 112b of envelope detected circuit 22 detection CD D so that detect the part presumptive test district of CD D, begins reference record by this test section part before parameter is carried out.
Servo circuit 13 carries out the rotation control of Spindle Motor 11, and focus control, the FEEDBACK CONTROL of tracking Control and optical receiver 10.In optical data recording/reproducing device of the present invention, can when record, switch and carry out the method for a kind of Constant Angular Velocity (CAV) that drives CD D with constant angular velocity, and a kind of constant linear velocity method that when linear velocity is set at constant, drives CD D.The control signal of servo circuit 13 response controllers 16 changes CAV control and CLV control.In the CAV control of being undertaken by servo circuit 13, control is consistent with the revolution of setting by the revolution of the Spindle Motor 11 that frequency generator 21 detects.In addition, in the CLV control of being undertaken by servo circuit 13, control Spindle Motor 11 makes the swinging signal of the signal of the EFM-modulation that is provided by RF amplifier 12 indicate a linear velocity of setting to amplify.
The record data that scrambler 17EFM-modulation is provided, and output data is to countermeasure circuit 18.Described countermeasure circuit 18 is with respect to the treatment for correcting of the EFM signal execution time axle that provides from scrambler 17, and to laser driver 19 output drive signals.Laser driver 19 drives the laser diode of optical receiver 10 according to the signal of the record data modulation that provides from countermeasure circuit 18, and controls laser power control circuit 20.
The laser power that the laser diode of laser power control circuit 20 control optical receivers 10 sends.Specifically, the information Control laser driver 19 of the best target value of current value that laser power control circuit 20 provides according to the monitoring diode from optical receiver 10 and the indication laser power that provided by controller 16 makes the laser beam with optimal laser power from optical receiver 10 emissions.
Controller 16 is by CPU (central processing unit) (CPU), read-only storage (ROM), and formations such as random-access memory (ram), and according to the work of each device feature of the programmed control optical data recording/reproducing device of ROM stored.
At first, the parts of controller 16 each devices of control are to carry out test record for the presumptive area that is set in the CD D in the optical data recording/reproducing device before above-mentioned normal or physical record.In addition, controller 16 is carried out the writing speed mensuration processing that is used to obtain writing speed, in described processing, utilizing optical data recording/reproducing device to be subjected to not have on the CD D of test record the satisfied record of any recording error, and the signal that obtains when carrying out the reproduction of test recording area according to the β value that is detected by β testing circuit 24, and the count value of the C1 error that is detected by C1 error-detector circuit 23 etc. is carried out writing speed mensuration.Fig. 3 is expressed as and obtains writing speed and the functional structure of the controller 16 that the executive logging velocity determination is handled.
As shown in Figure 3, controller 16 has C1 error preferred value reservoir 200, writing speed-β characteristic function reservoir 201, β preferred value reservoir 202, β-C1 error characteristics produce part 203, and writing speed-β characteristic produces part 204 and writing speed produces part 205.
Produce in the part 203 at described β-C1 error characteristics, provide by β testing circuit 24 and detect β values, and by the count value (calling the C1 error amount in the following text) of the C1 error of C1 error-detecting electric current 23 detections.Afterwards, represent a plurality of writing speeds (for example, V1, V2, V3 at Fig. 4 A; The recording characteristic of the relation indication between the β value of each among V1＜V2＜V3) and the count value of C1 error can obtain from β value and the C1 error amount that is provided.In order to obtain each characteristic in a plurality of writing speeds, with three writing speed V1, V2, V3 carries out test record, and the β value that detects from the reproducing signal in the zone of each speed record and the C1 error amount recording characteristic that can obtain each speed.In addition, replace carrying out the method for test record and acquisition recording characteristic as shown in Figure 3 in each speed, method for example shown in Figure 3, described method comprises: only carry out test record a writing speed; The data of utilizing other obtain speed according to the experimental result of carrying out in advance from the reproducing signal of test recording area; The characteristic that is different from the writing speed of test record speed according to acquisition.Also have, can carry out once or repeatedly test record, but preferably carry out repeatedly test record, make the judged result that is obtained more accurate for a certain speed (one or more speed).
Described writing speed-β characteristic produces part 204 and obtains a writing speed characteristic, and this characteristic produces the β for each writing speed-C1 error characteristics and value as shown in Figure 4 that is stored in the C1 error preferred value information that stores in the C1 error preferred value reservoir 200 and the relation between the writing speed that part 203 obtains based on aforesaid by β-C1 error characteristics.
As shown in Figure 5, in C1 error preferred value reservoir 200, store the information that the scope of the satisfied C1 error amount that writes down is carried out in indication for every type CD D (different fabricators and dyestuff).In described example, storing the satisfied record of indication can be with the information of A type dish execution in 0-10 (in maximum time the be the 98C1 error amount) scope at the C1 error amount.Here, the information in the C1 error preferred value reservoir 200 of being stored in be one for every type CD by in advance the value that experiment obtained.Writing speed-β characteristic produces part 204 and utilizes the C1 error preferred value information that is stored in the C1 error preferred value reservoir 200, utilizes the following writing speed-β characteristic of method acquisition shown in Fig. 4 B.
At first, writing speed-β characteristic produces part 204 from being stored in preferred value information acquisition in the C1 error preferred value reservoir 200 corresponding to the C1 error preferred value information of the information type of the CD D that is detected by address detection device circuit 14.In addition, obtain to be used for the C1 error amount is set in the upper and lower limit that each obtained of three writing speeds according to the C1 error preferred value information that is obtained and the β shown in Fig. 4 A-β-C1 error characteristics that C1 error characteristics generation part 203 obtains by the β value in the scope of C1 error preferred value information indication.For example, when the type information of the CD that is detected by address circuit 14 is A, from being stored in C1 error preferred value information acquisition in the C1 error preferred value reservoir 200 corresponding to the preferred value information (0-10) of type A.In addition, shown in Fig. 4 B, can obtain to be used to set the possible higher limit PJ1 of C1 error amount β value of C1 error amount in, PJ2, PJ3 and lower limit PK1, PK2, PK3 by the scope 1-10 of the C1 error preferred value information indication that is obtained.
Possible higher limit PJ1 in the β value that obtains each writing speed, PJ2, PJ3 and lower limit PK1, PK2 is during PK3, writing speed-β characteristic produce part 204 obtain shown in Fig. 4 B writing speed with according to the higher limit PJ1 that is obtained, PJ2, PJ3 and lower limit PK1, PK2, PK3, and be stored in relation between the possible upper and lower limits of β value of the function information in the writing speed-β characteristic function reservoir 201.In writing speed-β value characteristic function reservoir 201, store indication and be used for changing the function information of change that the C1 error amount is set in the upper and lower limit value of the β value in the preferable range corresponding to writing speed.Here, upper and lower limit value according to the β value of the relevant a large amount of writing speed that is obtained by the test record experiment of carrying out with a large amount of writing speeds is in advance obtained function information, and linear function stored (that is, the function line shown in the curve among Fig. 4 B sexually revises) in the present embodiment.And, store best information in advance for every type CD D (different fabricators and dyestuff) for function information, can select suitable function information according to the type information of CD D.And the upper and lower limit of β-value can be from function information and higher limit PJ1 with respect to the displacement of writing speed, and PJ2, PJ3 and lower limit PK1, PK2, PK3 utilize line L1 shown in Fig. 4 B and L2 to limit.When utilizing line L1 and L2 do to limit, can obtain to indicate value β by the possible range of the β-value of the lower limit of the higher limit of β and β mAnd the relation between the writing speed, and can obtain as shown in Figure 6 writing speed-β scope characteristic.In addition, from three higher limit PJ1 of characteristic acquisition of three above-mentioned writing speeds, PJ2, PJ3 and lower limit PK1, PK2, PK3 utilizes these values can obtain the possible β of β value mRelation between scope and the writing speed.At two functions (promptly, linear function Y=ax+b+c, wherein c represents the value along with the upper and lower limit value change of actual measurement, and a, b is a fixed value), they are used to be stored in the upper and lower limit value in writing speed-β characteristic function reservoir 201, and when the higher limit PJ1 of certain speed of acquisition V1 and lower limit PK1, linear function can be used for limiting line L1 and L2.So, can obtain the possible range beta of β value mAnd the relation between the writing speed.Can obtain possible range beta from the β-C1 error characteristics of a speed in this way mAnd the relation between the writing speed.Certainly, in this case, can carry out test record with single speed.In addition, replacement obtains aforesaid upper and lower limit value, can keep indicating the possible range β of β value in advance mAnd the function of the relation between the writing speed (that is, and linear function Y=AX+B=C, wherein, C represents along with the higher limit of actual measurement and value that the difference between the lower limit of the speed of this appointment is changed, and A, B is a fixed value).The possible range β of β value mAnd the relation between the writing speed can obtain from the higher limit of these functions and speed and the actual measured value of the relation between the lower limit.
Writing speed produces part 205 and obtains a maximal rate, can be with respect to according to being produced writing speed-β scope characteristic that part 204 obtains by above-mentioned writing speed-β characteristic and being stored in the CD D executive logging with the test record of the recording level of maintenance satisfaction of being subjected to of β preferred value information β value preferred value reservoir 202 at this speed optical data recording/reproducing device.As shown in Figure 7, in β preferred value reservoir 202, store the value of indication permission for the fluctuating scope of the record of being satisfied with of the type (different fabricators and dyestuff) of every kind of CD D.Described for example in, storing indication can be positioned at 10 or the be satisfied with information of record of above scope at β with A type CD.That is, in preferred β value scope, be difficult to control β in a little value range for optical data recording/reproducing device during as the decline of target, because the distortion of CD D, reason such as dyestuff is inhomogeneous.In β preferred value reservoir 202, consider the difficulty of the target beta value that control usefulness is very little, therefore storing optical data recording/reproducing device can be enough to the β value is controlled in the target zone, even CD D has distortion, the appearance of the inhomogeneous grade of dyestuff.Here, the information that is stored in the β preferred value reservoir 202 is a value that is formerly obtained by experiment for every kind of disc-type.Described writing speed produces part 205 and uses the preferred value information of the β value scope that is stored in β preferred value reservoir 202 to obtain maximum writing speed, be positioned at from characteristic shown in Figure 6 scope by the indication of preferred value information at this speed β, dominant record speed can be in the maximal rate that is subjected to being subjected to the level of holding the record the enterprising line item of CD D of test record as optical data recording/reproducing device.The example of Fig. 6 is represented the range beta of β value mPreferred value information be 10 or above situation.In this case, obtain characteristic line L3 and line L4 and intersect β m=10 o'clock writing speed maximal value is as the maximal rate of record.
Get back to Fig. 1, controller 16 control hardwares in optical data recording/reproducing device of the present invention are to carry out the switching between CAV and the CLV according to the record maximal rate of above-mentioned acquisition.Specifically, controller 16 control servo circuits 13 are so that utilize the CAV method during record on inner circumferential side.Behind opening entry in this way, controller 16 is determined the radial position of CD D based on the address information that provides from address detection circuit, and with predetermined angular velocity drive shaft motor 11.In this case, when detecting radial position corresponding to the maximal rate that obtains as mentioned above, controller output controls signal to servo circuit 18 with what the CAV method switched to the CLV method.As shown in Figure 8, revolution during corresponding to the linear velocity of 12 times of speed of inner periphery position with CAV method drive shaft motor 11.When reaching the maximal rate (16 times of speed) of revolution, on-line velocity detects radial position.So, the control signal of controller 16 outputs switching CLV to servo circuit 13.Afterwards, in the CLV method, servo circuit 13 is with 16 times speed drive Spindle Motor 11.
Also have, when writing down with the CAV method, controller 16 will indicate the information of the desired value of optimal laser power to export laser power control circuit 20 to according to linear velocity in succession.That is, when carrying out CAV control, along with line speed record changes in succession, so the output indication changes the information of the laser power best target value of linear velocity in succession.Specifically, at the record of outer circumferential sides radial light dish.That is, when on-line velocity increases, export laser power output circuit 20 in succession to as the big laser power of desired value.Here, can perhaps can obtain with reference to the desired value of the tables of data acquisition that obtains by prior experiment corresponding to the optimal laser power of electric current linear velocity with so-called OPC method.Described OPC method comprises: carry out the test record of CD D in inner circumferential portion before normal recordings; And the desired value that obtains optimal laser power from the reproducing signal that partly obtains by playback record in each linear velocity.
The operation of A-2 first embodiment
The structure of optical data recording/reproducing device according to the first embodiment of the present invention described above.Below will be referring to the flowchart text that is undertaken by controller shown in Figure 8 16 by the recording operation of the optical data recording/reproducing device of structure as mentioned above.
At first, when the user is placed on CD D in the optical data recording/reproducing device and instructs start-of-record, write down test at the test section 112a of set CD D (Sa1 step).Then, controller 16 utilizes the writing speed of going to drive maximum from the detected β value of the reproducing signal of test recording area and C1 error amount, the record (Sa2 step) of being satisfied with corresponding to the CD D of setting at this speed optical data recording/reproducing device.
Afterwards, controller 16 indication servo circuits 13 drive CD D (Sa4 step) with the CAV method, and carry out record with the CAV method.When beginning the record of CAV method by this way, controller 16 will indicate the information of the desired value of the optimal laser power that changes corresponding to linear velocity to export laser power control circuit 20 to, so that along with the increase of linear velocity increases laser power.Thus, laser power control circuit 20 FEEDBACK CONTROL laser powers are so that obtain the desired value that slave controller 16 provides.
In addition, controller 16 is according to judging whether that from the detected address information of address detection circuit the linear velocity of the record position of CD D reaches above-mentioned dominant record speed (Sa4 step).Here, when the linear velocity that determines record position did not reach maximum line velocity, controller 16 carried out record continuously with the CAV method.When all data of desire record were recorded, recording process finished (the Sa5 step is judged " YES ").On the other hand, when judging that in the Sa4 step linear velocity of record position reaches dominant record speed, controller will indicate recording method to output to servo circuit 13 from the control signal that the CAV method switches to the CLV method, and with CLV method executive logging (Sa6 step).
Afterwards, with CLV method record the time, controller 16 judges whether end of record (EOR) (Sa7 step).When all data of desire record were recorded, when perhaps the user indicated end of record (EOR), judged result was " YES ", so recording process finishes.
In the present embodiment, before the normal data recording process, carry out test record, and can obtain to obtain the dominant record speed of satisfied record from the reproducing signal of test recording area for CD D.Also have, when carrying out normal recordings, the CAV record proceeds to until obtaining maximum writing speed.After the writing speed of maximum reached, the CVA record carried out with this speed.So, need not give once satisfied recording quality level record data at short notice.So, when the user need not inform that the compatible mutually situation of the respective record speed of CD D or CD D and optical data recording/reproducing device gives an order record, can carry out automatic record data with satisfied recording level at short notice.
A-3 improves example
The invention is not restricted to the embodiments described, can make various following improvement to this.
(improving example 1)
In the above-described embodiment, when reaching the consistent dominant record speed of result with test record, just carry out the CAV record.After reaching the maximal rate record, carry out the CLV record.Yet, can carry out the CLV record with dominant record speed or lower speed from beginning.
In addition, the dominant record speed of above-mentioned acquisition is 12 times speed, and the CLV record of 16 times of speed of user instruction.In this case, can make user's setting recording speed once more with not obtaining the information notification user of satisfied record with the CLV record of 16 times of speed.In addition, the writing speed of setting the user without user's setting speed once more as described above, just can automatically be set the writing speed of maximum or lower writing speed greater than by the dominant record speed of above-mentioned acquisition the time.In this case, need to estimate to write down the required time, and the time of estimating is informed the user with change/setting recording speed.
(improving example 2)
In addition, in the above-described embodiment, the dominant record speed of the record that can obtain to be satisfied with, yet, the situation that recording level is damaged in the time of also need considering to carry out low-speed record (is used for the C1 error amount is subjected to the range beta of the β value in preferable range as shown in figure 10, when low speed mSituation about reducing).In this case, as shown in figure 11, can obtain by a certain velocity amplitude of β preferred value information indication (in institute's example be 10 or more than) as smallest record speed V Min
As shown in figure 12, obtain in this way have the normal recordings of smallest record speed the time, to carry out the CLV record greater than the writing speed of the smallest record speed that is obtained (being 4 times of speed in the described example), and can switch to the CAV record, this moment, the linear velocity of CAV record surpassed smallest record speed.
(improving example 3)
In addition, in the present embodiment, be that the basis obtains writing speed, but be not limited to this, also can obtain writing speed according to writing laser power value with the β value.In this case, each a plurality of writing speeds of the C1 error amount that provides from C1 error-detector circuit 23 of controller 16 obtains to write down the relation between the C1 error amount shown in laser power value and Figure 13 A.Here, as shown in FIG. 13A, write laser power value be used as with reference to rather than during the β value, recording powers of laser beam also increases along with higher writing speed.So, according to writing laser power value acquisition writing speed as a reference.Afterwards, each speed and the best of being obtained by OPC write laser power value PL1, PL2, and the characteristic of PL3 is used to obtain the higher limit PJ1 ' of performance number, PJ2 ', PJ3 ' and lower limit PK1 ', PK2 ', the difference of PK3 ' and the best write the ratio of laser power value, at this moment, the C1 error amount is not more than for each and writes the reference value of the speed of laser power value from the best,, writes the ratio (%) that laser power value obtains the performance number that allowed from the best that is.For example, utilize following equation can obtain last allowed band value PJ01 (%) for writing speed V1.
PJ01＝(PJ1’-PL1)/PL1*100
Adopt this mode, shown in Figure 13 B, can obtain in each writing speed, to write the permission upper range value PJ01 of laser power, PJ02, PJ03 and permission lower range value PK01, PK01, PK03.In addition, as shown in figure 14, can obtain to write the allowed band of laser power value and the relation between the writing speed, and the writing speed can obtain to write the indicating predetermined value Pm1 of the preferable range Pm of laser power value the time, and as maximum writing speed.
(improving example 4)
Also have, in the present embodiment, according to the β scope acquisition writing speed of C1 value less than predetermined value.Yet the parameter that relates to recording level is not limited to the C1 error, also can utilize other parameter.For example, as shown in figure 15, replaced C 1 error-detector circuit 23 provides frame synchronizing signal to detect sum counter circuit 140.The counter circuit 140b that frame synchronizing signal testing circuit 140a is provided and is used for counting by the detection frequency that frame synchronizing signal testing circuit 140a detects to frame synchronizing signal, and without the C1 error amount.Detection frequency by the frame synchronizing signal of counter circuit 140b counting can be used for obtaining writing speed.Here, be similar to aforesaid embodiment, frame synchronizing signal testing circuit 140a sum counter circuit 140b carries out EFM-modulation, the input EFM frame synchronizing signal from being obtained simultaneously to the reproducing signal of test recording area, the count detection frequency, and to controller 16 output count results.
A kind of detection frequency of frame synchronizing signal rather than method of C1 error amount used comprises: obtain the detection frequency of frame synchronizing signal and the β testing circuit 24 of β value provide from to(for) each the β value foundation a plurality of writing speeds shown in Figure 16 A of the detection frequency of the frame synchronizing signal that provides from testing circuit 140 between relation.This method also comprises: for each writing speed (V1, V2, V3) the higher limit SPJ1 of acquisition β value, SPJ2, SPJ3 and lower limit SPK1, SPK2, SPK3, the scope of the detection frequency of (for example, 90 or more than) therefore can keep the recording level of the satisfaction shown in Figure 16 B so that the frame synchronizing signal that obtains to be obtained by previous experiment; According to utilizing the function (being linear function in this example) that had before obtained to obtain writing speed β scope characteristic, the relation between the value β m of this characteristic indication writing speed and indication β value scope by experiment.After obtaining writing speed β value scope in this way, adopt the writing speed that is similar in the present embodiment to produce part, can obtain writing down maximal rate.
In addition, as shown in figure 17, provide shake testing circuit 160 to substitute C1 error-detector circuit 23, and can use the alternative C1 error amount of the jitter value that detects by shake testing circuit 160 to obtain writing speed.。Here, shake testing circuit 160 has balanced device, limiter, phase-locked loop (PLL) circuit, and jitter measurement unit.The RF signal that is provided by RF amplifier 12 passes through balanced device, and the signal that passes through balanced device is added to PLL circuit and jitter measurement unit with binary RF signal then by the limiter scale-of-two.In the PLL circuit, from binary RF signal clocking, and the clock signal that is produced delivered to the jitter measurement unit, the reference length deviation of shake as standard deviation and the deviation clock and the scale-of-two RF signal of recorded bit measured in the jitter measurement unit.
A kind of method of using jitter value to substitute the C1 error amount comprises: the β value of jitter value and each speed from a plurality of writing speeds shown in Figure 18 A of the jitter value that provides by shake testing circuit 160 is provided and the β value that provides by β testing circuit 24 between relation.Also comprise: for each writing speed (V1, V2, V3) obtain the higher limit JPJ1 of β value, JPJ2, JPJ3 and lower limit JPK1, JPK2, JPK3 is so that acquisition is by the scope (jitter value is 35 or following in the present embodiment) of the resulting jitter value of experiment that can keep satisfied recording level shown in previous Figure 18 B; And utilize the function (being linear function in this example) that obtains by previous experiment to obtain the writing speed β scope characteristic that concerns between the value β m of indication writing speed and indication β value scope.Utilizing after this method obtains writing speed β scope characteristic, the writing speed that is similar among the embodiment produces the maximal rate that part can obtain writing down.
In addition, as shown in figure 19, provide deviation detection circuit 180 replaced C 1 error amount testing circuit 23.And can use the deviate that detects by deviation detection circuit 180 to substitute the C1 error amount, obtain writing speed.Here, deviation detection circuit 180 be similar to the shake testing circuit 160 have balanced device, limiter and PLL circuit.In addition, replace the jitter measurement unit, the deviation (recorded bit and reference length deviation) between clock that also provides a deviation measuring unit to be used to detect to provide from the PLL circuit and the scale-of-two RF satisfaction that provides from limiter.
A kind of method of deviate replaced C 1 error amount of utilizing comprises: obtain deviate and the deviate that provides from deviation detection circuit 180 for a plurality of writing speeds shown in Figure 20 A each the β value and the relation between the β value that provides from β value testing circuit 24, this method also comprises: for each writing speed (V1, V2, V3) higher limit DPJ1, DPJ2, DPJ3 and lower limit DPK1, DPK2, DPK3 is so that by the scope of the resulting deviate of previous experiment that can keep the satisfied recording level shown in Figure 20 B (being-20≤deviate≤20 in the present embodiment); And utilize the function that obtains by previous experiment to be used to obtain to indicate the writing speed β scope characteristic that concerns between the value β m of scope of writing speed and indication β value.After adopting this method acquisition writing speed β value scope characteristic, the writing speed that is similar to present embodiment produces part, can obtain writing down maximal rate.
In addition, substitute the C1 error amount, when reproducing test recording area, can utilize the parameter that provides from RF amplifier 12, the amplitude of RF signal for example, degree of modulation and reflectivity obtain writing speed.Here, the relation between the range value of RF signal and the β value has a specific character, that is, the characteristic that range value increases along with the rising of β value, and range value is increased to a certain degree until reaching saturated shown in Figure 21 A.Be similar to the above embodiments, obtain described characteristic, that is, can obtain the upper and lower limit value of the β value in the scope of the amplitude of RF signal that obtains by previous experiment for each writing speed for each speed in a plurality of writing speeds.Afterwards, be similar to the above embodiments and can obtain described writing speed.
Also have, the relation between degree of modulation and the β value has the characteristic of the amplitude of the RF signal that is similar to shown in Figure 21 B.Be similar to aforesaid embodiment, can obtain above-mentioned characteristic, and can obtain the higher limit and the lower limit of the β value in the degree of modulation scope that obtains by previous experiment for each writing speed for each speed in a plurality of writing speeds.Afterwards, be similar to the above embodiments, can obtain described writing speed.In addition, the maximal value of supposing the RF signal is Imax, and minimum value is Imin, and then the relational expression by degree of modulation=(Imax-Imin)/Imax obtains degree of modulation.
In addition, the relation between reflectivity and the β value has the characteristic of linear function, and wherein shown in Figure 21 C, reflectivity descends with the increase of β value.Be similar to the above embodiments, obtain characteristic, and can obtain the higher limit and the lower limit of the β value in reflectivity range that obtains by previous experiment for each writing speed for each speed in a plurality of writing speeds.Afterwards, be similar to the above embodiments, can obtain writing speed.In addition, can make the RF signal by low-pass filter and average and obtain reflectivity.
In addition, in the above-described embodiment, can obtain each parameter of replaced C 1 error amount and the relation between the β value, obtain writing speed then.Yet, as improving as described in the embodiment, can obtain each parameter and write relation between the laser power value in order to obtain writing speed.
In addition, can utilize a plurality of parameters (for example, C1 error amount and jitter value) to obtain each writing speed.For example, when obtaining dominant record speed, can utilize low velocity in the writing speed that two parameters obtain as dominant record speed.When obtaining smallest record speed, can utilize higher speed in the writing speed that two parameters obtain as smallest record speed.
(improving example 5)
Also have, in the foregoing embodiments, described and utilized the example of CD-R as CD D.Yet the present invention also can be used in CD-RW, DVD-R, the record of DVD-random access memory (DVD-RAM) etc.
(improving example 6)
In addition, being used to carry out the controller 16 that comprises the recording processing of measuring the writing speed process can be made of the hardware circuit of special use.In addition, when controller 16 is made of central processing unit (CPU) etc., can realize handling by software by the program that execution be stored in the read-only memory (ROM) for example.When utilizing said method to handle by software, the various recording mediums that can use the computer realization recording processing, for example CD-ROM and flexible plastic disc can use for the user, perhaps can for example the internet program be offered the user by transmission medium.
As mentioned above, according to a first aspect of the present invention, for certain video disc recording the time, can measure writing speed scope with some recording errors.
The formation of B-1 second embodiment
The second embodiment of the present invention some formation with first embodiment basically is identical.Therefore, referring to Fig. 1, provide as shown in Figure 1 according to the formation explanation of the optical data recording/reproducing device of second embodiment of the invention, described optical data recording/reproducing device comprises optical receiver 10, Spindle Motor 11, RF amplifier 12, servo circuit 13, address detection device circuit 14, demoder 16, controller 16, scrambler 17, countermeasure circuit 18, laser driver 19, laser power control circuit 20, frequency generator 21, envelope detected circuit 22, C1 testing circuit 23 and β testing circuit 24.
Spindle Motor 11 is one and is used for rotation/driving CD (as, the CD-R) motor of D for record data.Optical receiver 10 has a laser diode, and an optical system is lens and catoptron for example, and the back light receiving element.When writing down and reproduce, optical receiver receives the light that returns from CD D again with laser beam irradiation CD D, and exports the RF signal that is subjected to 8-14 modulation (EFM), as the light receiving signal of RF amplifier 12.In addition, optical receiver 10 has monitoring diode, and the light that is returned by CD D produces electric current in described monitoring diode, and with described current supply laser power control circuit 20.
12 pairs of RF signals from optical receiver 10 of described RF amplifier amplify, and are subjected to the WFM modulation, and to servo circuit 13, address detection circuit 13, envelope detected circuit 22, β testing circuit 24 and the RF signal of demoder 15 outputs through amplifying.15 pairs of modulated RF signals from RF amplifier 12 of demoder carry out the EFM demodulation, and produce the reproduction data when reproducing.
On the other hand, when writing down, demoder 15 carries out the EFM demodulation for the RF signal that is provided by RF amplifier 12 when reproducing the test record data, and C1 error-detector circuit 23 detects the C1 error according to restituted signal, and exports this error to controller.Described C1 error-detector circuit 23 is utilized so-called staggered error correction code of reading Solomon sign indicating number (CIRC), make the EFM restituted signal be subjected to error correction, and detect the frame number that in a sub-code frame (98EFM frame), can not carry out first error correction, that is, and the frequency of C1 error.
Optical data recording/reproducing device according to second embodiment of the invention, its formation adopts the writing speed that is set by the user to carry out test record in the fate of the inner circumferential side of CD D (see figure 2) before being used in normal recordings, and when as above writing down, obtain the be satisfied with writing speed of record for CD D according to the reproduction result of test recording area.When carrying out test record with optical data recording/reproducing device, adopt 15 phasic changes to write laser power value, and for a subcode frame recording EFM signal that writes laser power value, and record is for all EFM signals of 15 frames.
Here, will the zone of carrying out CD D (CD-R) test record be described once more referring to Fig. 2.The zone of CD D that will have diameter and be 46-50mm is as guiding area 114, and produces program area 118 and the remaining area 120 that record data are used on the outer circumferential sides of guiding area.On the other hand, also has an inner circumferential side capability correction district (PCA) 112.Described inner circumferential side PCA district 112 comprises a test section 112a and a count block 112b.District 112a is subjected to test record at normal recordings process Pretesting.Here, the district that will carry out substantive test record is as test section 112a, and is recorded in the 112b of count block at the EFM signal of part that test record finishes the test section 112a of indication end record.So, when CD D is subjected to test record, read the EFM signal of count block 112b.So, can see the position of the test section 112a that carries out test record.In optical data recording/reproducing device of the present invention, test section 112 has been subjected to test record before normal recordings.
Return Fig. 1, address detection circuit 14 extracts the dither signal composition from the EFM signal that EF amplifier 12 provides, and indication is included in temporal information (address information) decoding of each position in the dither signal composition, identifying information (CD ID) is used to discern CD and disc-type, Pan dyestuff for example, and to controller 16 output informations.
Described β testing circuit 24 calculates the β value when reproducing test recording area as the parameter for the reproduction recording level of the EFM modulated RF signal that provides from RF amplifier 12, and result of calculation is passed to controller 16.Utilize equation (a+b)/(a-b) to measure β value, wherein, alphabetical a represents to be subjected to the peak level (+number) of the signal waveform that EFM modulates, and, alphabetical b represent end level (number).
The envelope of the EFM signal of the count block 112b of described envelope detected circuit 22 detection CD D is so that detect the part in the presumptive test district of the CD D of beginning test record before carrying out reference record.
Described servo circuit 13 carries out the rotation control of Spindle Motor 11, and focus control, the FEEDBACK CONTROL of tracking Control and optical receiver 10.In optical data recording/reproducing device of the present invention, carry out record with the method for constant linear velocity (CLV), be set by the user linear writing speed and drive CD D.Described servo circuit 13 is carried out CLV control, the linear velocity drive shaft motor of control signal to set that the setting speed that is used for providing according to slave controller 16 is indicated.Here, utilizing servo circuit 13 to carry out in the control of CLV, controlling Spindle Motor 11 so that linear velocity is amplified, so that the dither signal of EFM modulation signal is provided from RF amplifier 12.
17 pairs of record data that provide of scrambler carry out the EFM modulation, and data are outputed to countermeasure circuit 18 (strategy circuit).Countermeasure circuit 18 carries out processing such as time shaft correction for the EFM signal that is provided by scrambler 17, and exports signal to laser driver 19.Laser driver 19 drives the laser diode of optical receiver 10 according to the signal with the record data modulation that is provided by countermeasure circuit 18, and controls laser power control circuit 20.
Described laser power control circuit 20 controls are from the laser power that laser diode sent of optical receiver 10.Specifically, the current value that laser power control circuit 20 provides based on the monitor diode from optical receiver 10, and the information Control laser driver 19 of the best target value of the laser power that provides of indication slave controller 16, so that have the laser beam of optimal laser power by optical receiver 10 emissions.
At first, controller 16 each device features of control are so that carry out above-mentioned test record for the fate that is set in the CD D in the optical data recording/reproducing device before aforesaid normal recordings.And, controller 16 foundations are by β testing circuit 24, and the β pH-value determination pH that is detected by the count value of the detection frequency of the C1 error of detections such as C1 error-detector circuit 23 (below be called the C1 error amount) writes laser power value for carrying out recording the best by the user with the writing speed of the signal sets that obtained when reproducing the reference record district, and control laser power control circuit 20, make when carrying out normal recordings to have definite optimal laser power value from optical receiver 10 emitted laser bundles.Figure 22 illustrates that controller 16 is used to obtain the key structure that the best writes the process of laser power value.
As shown in figure 22, controller 16 has C1 error preferred value information memory 250, β preferred value information memory 251, laser power value established part 252, laser power scope dictates part 253, and optimal laser power value determining section 254.
Described laser power established part 252 obtains recording power-β characteristic of concerning between the β value that the result that indication writes laser power value and obtain from OPC (a plurality of write laser power value and corresponding to the β value of each laser power value) obtains before normal recordings.Described laser power value established part 252 is stored in the β preferred value information in the β preferred value information memory 251 according to described recording power-β characteristic, and writes laser power value from the information about disk type regulation that address detection circuit 14 provides.As shown in figure 23, for every type (fabricator, the dyestuff etc.) of CD D, in β preferred value reservoir 251, storage is used to carry out the β preferred value information of the indication β value of best titime, stores the conduct of β value=" 0 " in this example for the β value preferred value information of A type CD.Here, the information in the β preferred value reservoir 251 of being stored in be one for by the value of previous experiment with dissimilar CD acquisitions.In addition, not only can store a preferred β value, but also can be stored in the β preferred value reservoir 251 each writing speed (one times of speed, four times of speed, octuple speed) for every type CD.
For example, when obtaining OPC result's (corresponding to the β value that writes laser power value and C1 error amount of 15 types) as Figure 24, laser power established part 252 obtains indication and writes laser power value and the β power characteristic by relation between β value that writes the laser power value representation and OPC result's the β value shown in Figure 25.In addition, the β preferred value information of the optical disc types information that provides from the address detection circuit 14 corresponding to the β preferred value information that is stored in a large amount of optical disc types in the β preferred value reservoir 251 is provided for laser power value established part 252.Also have, each writing speed of storage in β preferred value reservoir 251 (one times of speed, four times of speed, octuple speed ...) preferred β value the time, can obtain β preferred value information corresponding to the writing speed that sets.In addition, described laser power value established part 252 is meant that β-power characteristic of obtaining according to the OPC structure (sees, Figure 25), and corresponding to stipulating that by the indicated β value of the β preferred value information that is obtained one writes laser power value Pt.
Laser power scope dictates part 253 obtain that indication writes laser power value and the C1 error amount that obtains from the result's (corresponding to a plurality of laser power value and C1 error amounts of writing of each laser power value) who before normal recordings, obtains by OPC between Writing power-C1 error characteristics laser power scope dictates part 253 regulations of concerning write the possible higher limit and the lower limit of laser power, promptly, one based on Writing power-C1 error characteristics, be stored in the C1 error preferred value information in the C1 error preferred value reservoir 250, and the scope of the probable value that writes laser power of the information about disk type that provides by address detection circuit 14.As shown in figure 26, in C1 error preferred value reservoir 250, every type of (fabricator for CD D, dyestuff etc.) store the C1 error preferred value information that the possible range of the C1 error amount that best titime uses is carried out in indication, store C1 error amount=" 0-10 " as C1 error preferred value information for the A type CD of described embodiment.In addition, in C1 error preferred value reservoir 250, not only for every type CD and also for each writing speed (one times of speed, four times of speed, octuple speed ...) all can store the information of possible range of the preferred C1 error amount of indication.
For example, obtaining as shown in figure 24 OPC as a result the time, laser power scope dictates part 253 obtains indication and writes laser power value and the power-C1 error characteristics from concerning between as shown in figure 27 C1 error amount that writes laser power value and OPC result's the C1 error amount.Also have, laser power scope dictates part 253 obtains C1 error amount information from the type information of the dish that the address detection circuit 14 corresponding to the C1 error preferred value information that is stored in a large amount of optical disc types in the C1 error preferred value storage 250 is provided.In addition, store each writing speed of storage (one times of speed, four times of speed, octuple speed in 150 in C1 error preferred value ...) the preferable range of C1 error amount, and can obtain C1 error preferred value information corresponding to the writing speed of setting.Also have, laser power scope dictates part 253 is meant according to the power-C1 error characteristics of OPC result's acquisition (sees, Figure 27), and obtain the C1 error amount is set in by higher limit PJ that writes laser power (being 16mv in the present embodiment) and lower limit PK (being 13mv in the present embodiment) in the scope of the C1 error amount of the C1 error preferred value information indication that is obtained, and stipulate possible scope Pm (writing the 13-16mv of laser power).
Optimal laser power value determining section 254 is according to writing laser power value Pt and determining that by the effective range Pm that writes laser power as above-mentioned laser power scope dictates part 253 regulations the best writes laser power value by laser power established part 252 regulations.Specifically, optimal laser power value determining section 254 judges whether to be positioned at the effective range Pm that writes laser power value that is stipulated by laser power scope dictates part 253 by the laser power value that writes of laser power value established part 252 regulations.Determining describedly when writing laser power value and being positioned at described scope Pm, the described laser power value Pt that writes is defined as the best and writes laser power value.On the other hand, when writing laser power value Pt and be positioned at the Fm scope, carry out OPC once more, can adopt to be similar to above-mentioned method and to carry out determining that based on OPC result the best writes the processing procedure of laser power value.Yet when writing laser power value and be not positioned at the Pm scope, definite method comprises: determine that the mean value that writes laser power value Pt and higher limit PJ or lower limit PK (near writing laser power value Pt) writes laser power value as the best.So, can not only consider the β value, but also consideration C1 error amount determines that the best writes laser power value.
Controller 16 will be indicated the best that obtains from aforesaid OPC result to write laser power value and be provided to laser power control circuit 20 as shown in Figure 1, and laser power control circuit 20 control laser drivers 19, it is consistent to make that performance number and the best of being emitted to the recording laser bundle of CD D from optical receiver 19 write laser power value.
B-2. operation
Structure according to the optical data recording/reproducing device of second embodiment of the invention has been described above.The operation of being carried out writing time by the above-mentioned optical data recording/reproducing device that constitutes will be illustrated referring to the process flow diagram flow chart of being carried out by controller shown in Figure 28 16 according to the program that is stored in the ROM.
At first, the user is provided with CD D in optical data recording/reproducing device, and instruction is with certain writing speed opening entry.Then, controller 16 each device features of control are carried out the interior reference record of test section 112a of CD D to adopt OPC (Sb1 step).Specifically, the signal that test record is used is delivered to scrambler 17, and control laser power control circuit 20, make to write laser power value and in 15 stages, changed.Adopt this mode to control the parts of each device, that is, each is write the EFM signal that laser power value record one sub-code frame is used, and carry out test record for 15 all frame recording EFM signals.
When each parts of control were carried out test record, controller 16 determined that according to the OPC result that the reproducing signal from test recording area obtains aforesaid the best writes laser power value (Sb2 step).Afterwards, controller 16 control laser power control circuits 20, servo circuit 13 etc., so as the writing speed that is set by the user and as above-mentioned definite optimal laser power value executive logging, and carry out recording process (Sb3 step) corresponding to CD D.
In the present embodiment, before normal recordings, carry out test record, the C1 error amount of the level of the recording status that obtains from the reproducing signal of test record according to β value and indication is measured the best and is write laser power value, and can carry out record with the laser power value of measuring that writes.Just, only consider that the β pH-value determination pH the best among the OPC commonly used writes laser power value.Yet, according to the present invention, can not only consider the β value, but also consider that C1 error amount mensuration the best writes laser power value.So, compare with the power measurement method of only considering the β value, can lower because the difference of each CD D product (curl, rugged change, dyestuff is inhomogeneous etc.) cause that recording level degenerates.For example, utilize the CD (seeing Figure 48) that effectively changes for β value with the effective change of β value dot characteristics carry out corresponding to the β available point write the laser power value record time.But, can not obtain satisfied recording status level sometimes.Yet, in the present embodiment, not only consider the β value, but also parameter of considering other relevant recording level is measured the best and is write laser power value.So, can suppress to change the caused recording level of point and degenerate by β.
B-3 improves example
Can improve second embodiment with following different mode.
B-3-1 improves example 1
The method of second embodiment comprises:
Corresponding to a plurality of laser power values that write, measure β value and C1 error amount from the reproducing signal of test recording area; And utilize these parametric measurement optimal laser power values.Yet described method can comprise: obtain other parameter for the recording status quality from the reproducing signal of test recording area; And utilize the parametric measurement the best that is obtained to write laser power value.
For example, as shown in figure 15, adopt the C1 error-detector circuit 23 among alternative second embodiment of frame synchronizing signal testing circuit 140a sum counter circuit 140b.Except the β value, can utilize the frame synchronizing signal that detects by frame synchronizing signal testing circuit 140a sum counter circuit 140b to detect frequency measurement the best and write laser power value.Here, be similar to second embodiment, frame synchronizing signal testing circuit 140a sum counter circuit 140b carries out the EFM modulation to the reproduction RF signal of test recording area, and the input EFM frame synchronizing signal from being obtained, and to detecting frequency counting, and frequency is outputed to controller 16.
When utilizing detection frequency replaced C 1 error amount of frame synchronizing signal, promptly, when detection frequency measurement the best of use β value and frame synchronizing signal writes laser power value, be similar to second embodiment, at first, the detection frequency of the frame synchronizing signal that provides from frame synchronizing signal testing circuit 140a sum counter circuit 140b, and obtain indication from the β value that β testing circuit 24 provides and write the Writing power-β characteristic that concerns between laser power value and the β value.In addition, as shown in figure 29, obtain indication and write the Writing power-frame synchronizing signal detection frequency characteristic that concerns between laser power value and the frame synchronizing signal detection frequency.
Described method also comprises: be similar to second embodiment, corresponding to by in advance-the β value that stores the indication of β preferred value information stipulates to write laser power value Pt; Writing power-frame synchronizing signal of quoting as shown in figure 29 detects frequency; Acquisition by in advance-store in the scope that frame synchronizing signal detects the indication of frequency preferred value information (in the present embodiment, frame synchronizing signal detect frequency be 90 or more than) setpoint frequency and regulation write higher limit SPJ that writes laser power (being 16.5mW in the present embodiment) and the lower limit SPK (being 12.5mW in the present embodiment) that the possible range SPm of laser power uses.
When β value regulation writes laser power value Pt, the possible range that writes laser power detects allocation by frame synchronizing signal, and as second embodiment, the described laser power value Pt that writes is positioned at the SPm scope, and will write laser power value Pt and be defined as the best and write laser power value.On the other hand,, carry out OPC once more, can measure the process that the best writes laser power value according to being similar to above-mentioned OPC result simultaneously writing laser power value Pt not in scope SPm the time.Yet, writing laser power value Pt not in the SPm scope time, assay method comprises: measure the mean value that writes laser power value Pt and higher limit SPJ or lower limit SPK (approaching to write laser power value Pt) and write laser power value as the best.So the detection frequency of not only β value, and frame synchronizing signal all can be measured the best and write laser power value.
In addition, as shown in figure 17, provide shake testing circuit 160 replaced C 1 error-detector circuit 23, so can determine that the best writes laser power value by shake testing circuit 160 rather than C1 error amount jitter detected value.Here, shake testing circuit 160 comprises balanced device, limiter phase-locked loop (PLL) circuit and jitter measurement parts.The RF signal that provides from RF amplifier 12 passes through balanced device, and by limiter the signal by balanced device is carried out scale-of-two.In addition, binary RF signal is added to PLL and jitter measurement parts.In the PLL circuit,, and the clock signal that is produced delivered to the jitter measurement parts by binary RF signal clocking.Described jitter measurement parts are from standard deviation and the reference length deviation of clock and scale-of-two RF signal measurement shake as recorded bit.
When utilizing jitter value rather than C1 error amount, promptly, when utilizing β value and jitter value measurement the best to write laser power value, at first, be similar to second embodiment, obtain that indication writes laser power value and the jitter value that provides from shake testing circuit 160 and the β value that provides from β testing circuit 24 between the Writing power-β characteristic of relation (see, Figure 25) and the β value that provides from β testing circuit 24.In addition, also can obtain indication and write the Writing power-jittering characteristic that concerns between laser power value and the jitter value as shown in figure 30.
Described method also comprises: be similar to second embodiment, regulation corresponding to by in advance-the laser power value Pt that writes of the β value of the β preferred value information indication that stores (sees, Figure 25); Quote Writing power-jittering characteristic shown in Figure 30; And acquisition writes the higher limit JPJ (being 16.9mW in this example) and the lower limit JPK (being 12.1mW in this example) of laser power, be used for this value is set in by (in this example for jitter value 35 or less than this value) in the scope that is stored into the indication of shake preferred value information in advance, and regulation writes the possible range JPm of laser power.
In this way when β value regulation writes laser power value Pt, write the possible range JPm of laser power value by the jitter value regulation, and as second embodiment, write laser power value Pt and be positioned at scope JPm, and this is write laser power value Pt write laser power value as the best.On the other hand, writing laser power value Pt not in scope JPm the time, carry out OPC once more, and can measure the process that the best writes laser power value based on being similar to above-mentioned OPC result.In addition, writing laser power value Pt not in scope JPm the time, assay method comprises that the mean value that will write laser power value Pt and higher limit JPJ or lower limit JPK (approaching to write laser power value) writes laser power value as the best.
In addition, as shown in figure 19,, and can utilize the deviate mensuration the best that detects by deviation detection circuit 180 to write laser power value with deviation detection circuit 180 replaced C 1 error-detector circuit 23.Here.Deviation detection circuit 180 comprises balanced device, limiter and the PLL circuit that is similar to shake testing circuit 160.Also have, replace the jitter measurement parts, adopt the clock signal that the deviation measurement component provides from the PLL circuit and carry out deviation from the scale-of-two RF signal that limiter provides and measure (deviation of recorded bit and record length).
During in the employing deviate and without the C1 error amount, promptly, when utilizing β value and deviate measurement the best to write laser power value, at first, be similar to second embodiment, Writing power-β characteristic (see, Figure 25) indication write laser power value and the β value that deviate obtained that provides from deviation detection circuit 180 and the β value that provides from β testing circuit 24 between relation.And the indication of Writing power-bias property writes the relation between laser power value and the deviate shown in Figure 31.
Described method also comprises: regulation is by writing laser power value Pt and (see, Figure 25) corresponding to the pre--β value of storage β preferred value information indication that is similar to second embodiment; Quote Writing power-bias property shown in Figure 31; And the higher limit DPJ (being 14.5mW in this example) and the lower limit DPK (being 12mW in this example) that obtain to write laser power, be used for will by in advance-value of deviation storage preferred value information indication is set in the scope (in this example for-20-20 deviate), and regulation writes the possible range DPm of laser power.
When adopting this method to write laser power value Pt by β value regulation, the possible range DPm that writes laser power value is stipulated by deviate, and write laser power value Pt and be positioned at the scope DPm that is similar to second embodiment, can be considered as the best and write laser power value writing laser power value.On the other hand,, carry out OPC once more, be similar to above-mentioned the best according to the result of OPC and write the process that laser power value is measured writing laser power value not in scope DPm the time.In addition, writing laser power value not in scope DPm the time, method for measuring comprises that measuring the mean value that writes laser power value Pt and higher limit DPJ or lower limit DPK (approaching to write laser power value Pt) writes laser power value as the best.
In addition, the amplitude of the RF signal that provides from RF amplifier 12 for example can be provided when reproducing test recording area replaced C 1 error amount, and degree of modulation and reflectivity equivalence are measured the best as parameter and write laser power value.Here, the relation between the range value of laser power value and RF signal of writing is based on following characteristic, that is, range value rises along with the rising that writes laser power value, and range value reaches capacity when rising to a certain degree, shown in figure 32.When utilizing RF range value mensuration the best to write laser power value, the RF signal that provides from RF amplifier 12 when reproducing aforesaid test recording area obtains Writing power-amplitude characteristic.Described method also comprises: quote the characteristic that is obtained; Be used for and write laser power settings in scope by higher limit RPJ that writes laser power that obtains and lower limit RPK, and regulation writes the possible range RPm of laser power value by the pre--preferred value information indication that stores of the amplitude of RF signal.In addition, be similar to second embodiment, can write laser power value according to scope RPm with by the laser power value Pt mensuration the best that writes that the β value is stipulated.
In addition, degree of modulation and the relation between the laser power value of writing have the amplitude that is similar to RF signal shown in Figure 33 and write relation between the laser power value.When utilizing degree of modulation to measure the best to write laser power value, the RF signal that RF amplifier 2 provides in the time of can be from above-mentioned reproduction test recording area obtains Writing power-degree of modulation characteristic.Described method also comprises: quote the characteristic that is obtained; Acquisition writes the higher limit HPJ and the lower limit HPK of laser power, quote to write laser power settings in the scope by the pre--preferred value information indication that stores of degree of modulation, and regulation writes the possible range HPm of laser power value.In addition, be similar to second embodiment, can measure the best and write laser power value according to scope HPm with from the laser power value Pt that writes of the β value regulation that is similar to second embodiment.Also have, the maximal value of suppose the RF signal is Imax, and minimum value is Imin, then utilizes the degree of modulation formula, the acquisition degree of modulation of degree of modulation=(Imax-Imin).
Also have, reflectivity and the relation that writes between the laser power value have the characteristic of linear function, and wherein reflectivity descends along with the increase that writes laser power value, sees Figure 34.When utilizing measuring reflectance the best to write laser power value, the RF signal that can provide from RF amplifier 12 when reproducing aforesaid test recording area obtains Writing power-reflectivity Characteristics.Described method also comprises: quote the characteristic that is obtained; Acquisition writes the higher limit HSPJ and the lower limit SHPK of laser power, be used for write laser power settings by reflectivity pre--store in the scope of preferred value information indication, and regulation writes the possible range HSPm of laser power value.In addition, be similar to second embodiment, can write laser power value according to scope HSPm with from the laser power value Pt mensuration the best that writes that the β value is stipulated.Also have, can obtain reflectivity by RF signal and the average signal that provides from RF amplifier 12.
B-3-2 improves example 2.
In second embodiment and previous improvement example, from stipulate the laser power value that writes of any according to the β value that the result obtained of test record, and from other parameter (C1 error amount, the detection frequency of frame synchronizing signal, jitter value, deviate, the amplitude of RF signal, degree of modulation and reflectivity) obtain to write the possible range of laser power value.Yet shown method can comprise: utilize other a point of parameter regulation write laser power value; And utilize β value regulation to write the possible range of laser power.
In addition, described method can comprise: utilize two or more parameters, and the level of recording status for example, as the C1 error amount, the detection frequency of frame synchronizing signal, jitter value, the amplitude of RF signal, degree of modulation and reflectivity are measured the best and are write laser power value.For example, described method can comprise: utilize the C1 error amount to stipulate the laser power value that writes of a bit; Utilize the detection allocation of frame synchronizing signal to write the possible range of laser power value; And measure the best and write laser power value according to write laser power value and the scope of defined.
In addition, in a second embodiment, the laser power value that writes of any can be by parameter regulation (for example β value in a second embodiment), and the possible range that writes laser power value is stipulated by other parameter (C1 error amount in a second embodiment).When being write laser power value by parameter regulation predetermined and be positioned at by other the scope of parameter regulation, the laser power value that writes of any writes laser power value as the best.Yet, can also measure the best by other method and write laser power value.For example, from β value regulation write laser power value and write laser power value as the best from any mean value that writes laser power value of C1 error amount regulation.
Also have, can utilize two parameters that relate to the recording status level, for example β value and C1 error amount obtain the best and write laser power value.Yet, also can adopt in the aforementioned parameters (C1 error amount, the detection frequency of frame synchronizing signal, jitter value, deviate, the amplitude of EF signal, degree of modulation and reflectivity) three or more.For example, using three parameters, as, the β value, the detection frequency values of C1 error amount and frame synchronizing signal, when being similar to the described acquisition the best of second embodiment and writing laser power value, write laser power value Pt and (see Figure 25) regulation, and the possible range that writes laser power value detects frequency characteristic from Writing power-C1 error characteristics and Writing power-frame synchronizing signal and obtains by Writing power-characteristic.For example, as shown in figure 35, in the possible range that writes laser power value during by Writing power-C1 error amount regulation, the possible range SPm that writes laser power value detects allocation by Writing power-frame synchronizing signal, and the best write laser power value can be according to being superimposed to the scope KPm that scope SPm goes up the part scope Pm of (the scope Pm in this example of scope KPm=), and write laser power value Pt and stipulate.
C. the 3rd embodiment
Below will be referring to Figure 36 and 37 optical data recording/reproducing devices that illustrate according to third embodiment of the invention.As shown in figure 36, the optical data recording/reproducing device that is different from according to second embodiment of the invention according to the optical data recording/reproducing device of third embodiment of the invention is, β testing circuit 24 is not provided in a second embodiment.The RF signal measurement C1 error that the utilization of C1 error-detector circuit is provided by 1RF amplifier 12 when reproduction is similar to test recording area among second embodiment, and output C1 error amount is as the measurement result to controller 16.
Controller 16 among the 3rd embodiment is different from the controller 16 among second embodiment on measuring the best method that writes laser power value.Figure 37 is illustrated in and utilizes controller 16 to measure the best functional structure that writes the controller 16 of laser power value process among the 3rd embodiment.As shown in figure 37, controller 16 has C1 error preferred value reservoir 220, and the best writes laser power value mensuration part 221.
Described the best writes laser power value and measures part 221 and obtain indicating and write the Writing power-error characteristics that concern between laser power value and the C1 error amount as shown in figure 38 by the result that OPC obtains who carries out before the normal recordings (a plurality of write laser power value and write the C1 error amount of laser power value corresponding to this).The best writes laser power value and measures part 221 according to the C1 error preferred value information that is stored in the C1 error preferred value reservoir 220, and writes laser power value from the information about disk type regulation that address detection circuit 14 provides.Store in 220 in C1 error preferred value, store the shake preferred value information of the indication C1 error amount that is used to carry out best titime for the CD D of every type (different manufacturings and dyestuff).Here, the information that is stored in the C1 error preferred value reservoir 220 is a value that is obtained for each CD by previous experiment.
When obtaining indication and write the power that concerns between laser power value and the C1 error amount as shown in figure 38-C1 error characteristics, the best writes laser power value and measures part 221 the C1 error preferred value information CJK (can equal 0) corresponding to optical disc types that provides corresponding to the address detection circuit 14 from C1 error preferred value information that is stored in a large amount of optical disc types in the C1 error preferred value reservoir 220 can be provided.In addition, the best writes laser power value and measures part 221 and quote the power-C1 error characteristics that obtain according to OPC result, and measures corresponding to writing laser power value Pt ' by the C1 error amount of the error amount information indication that is obtained.Also have, each device feature of controller 16 control laser power control circuits 20 makes the laser beam that writes laser power value Pt ' with mensuration be emitted to CD D from optical receiver 10.
According to the 3rd embodiment, can consider the C1 error amount, rather than the β value is used as parametric measurement the best and writes laser power value.For example, carry out the record that writes laser power value for the CD of the characteristic that has effective change point in the β value corresponding to this β available point.Thus, just can not obtain satisfied recording status level in some cases.Yet in the present embodiment, parts are considered the β value, but also consider that aquametry the best of other relevant recording status writes laser power value.So, can suppress degenerating of the recording status level that causes by the β available point.
Also have, in the 3rd embodiment, provide C1 error-detector circuit 23 to detect the C1 error amount from the reproducing signal of test recording area, and will be pre-in indication-laser power value that writes of the C1 error amount of the preferred value that stores writes laser power value as the best.Yet described method can comprise: detect relevant recording status, jitter value for example, the detection frequency of frame synchronizing signal, the parameter of the level of the amplitude of deviate and RF signal; And utilize any the mensuration the best in these parameters to write laser power value.
Also have, in the 3rd embodiment, will write laser power value as the best corresponding to the laser power value Pt ' that writes of the preferred value CJK of the C1 error amount of storage in the C1 error preferred value reservoir 220.Yet writing laser power value in the best is not during from the β parameter but from other parametric measurement, can utilize following method.
For example, from the detection frequency of the RF input frame synchronizing signal of test recording area the time, can obtain the Writing power represented-frame synchronizing signal and detect frequency characteristic as the solid line of Figure 39.When obtaining this characteristic, measure the best method that writes laser power value and at first comprise: obtain to detect the result of frequency characteristic quadratic function as the test record that utilizes least-square methods (representing by dot-and-dash line among Figure 39) to represent by solid line near Writing power-frame synchronizing signal.For example, detect frequency (SYEQ)=ap at quadratic function with frame synchronizing signal 2(wherein P represented to indicate the variable value that writes laser power value when+bp+c represented, and a, b, c represents fixed value), this quadratic function of differential just can obtain variable=ap+b that frame synchronizing signal that per unit writes laser power detects frequency (below be called Δ NSYEQ).Δ NSYEQ that obtains in this way and the relation that writes between the laser power value can be represented with linear function as shown in figure 40, quote Writing power-Δ NSYEQ characteristic that Figure 40 represents and corresponding in advance-the laser power value Pt that writes of the preferred Δ NSYEQ value SK that stores " writes laser power value as the best.
Also have, for the input C1 error amount that obtains from RF signal by EFM-demodulation test recording area, write laser power value with mensuration the best, be similar to and utilize frame synchronizing signal detection frequency measurement the best to write laser power value, the quadratic function that approaches Writing power-C1 error amount characteristic as shown in figure 41 can pass through least-square methods (by dot-and-dash line shown in Figure 41) and obtain.For example, be similar to the detection frequency of utilizing frame synchronizing signal, the quadratic function shown in the differential, and obtain as shown in figure 42 Writing power-Δ C1 error characteristics.Quote Writing power shown in Figure 42-Δ C1 error characteristics, and measure corresponding in advance-the laser power value PCt that writes of the preferred Δ C1 error amount that stores writes laser power value as the best.
In addition, in above-mentioned improvement example, utilize least-square methods to obtain to approach the quadratic function that Writing power-frame synchronizing signal detects frequency, perhaps Writing power-error characteristics.Write laser power value as optimum value when Δ NSYEQ that represents at the linear function that utilizes the differential quadratic function to obtain or Δ C1 error characteristics indication preferred value.Yet spendable method comprises: obtain to be similar to the above-mentioned quadratic function near Writing power-frame synchronizing signal detection frequency; When the subregion that line limited of being detected frequency=0 by the curve of the quadratic function that is obtained (dot-and-dash line) and indication frame synchronizing signal is set at S, measure have region S 40% write laser power value.In this case, the laser power value that writes that can have this region rate by previous experiment acquisition, and store the region rate that obtains by experimental result.
In addition, as shown in figure 44, the best that replaces aforesaid mensuration to have the ratio of region S writes laser power value, acquisition is similar to as the curve of the quadratic function of above-mentioned acquisition crossing as writing laser power value PSK, PSJ with the line F50 that the default frame synchronizing signal of expression detects frequency values (frame synchronizing signal detects frequency=50 in the present embodiment).And can measure the best from these values and write laser power value.For example, as shown in figure 44, obtain the best by following formula and write laser power value PS.
PS＝(PSJ-PSK) *0.4+PSK
Utilize this equation, obtaining writing value between laser power value PSK and the PSJ (PSJ 60% value) as intersecting value, is 40% value of PSK, and can be used as the best and write laser power value.
In addition, use the detection frequency of detection frame synchronizing signal and the method for C1 error amount, utilize quadratic function to represent each characteristic by least fibre method, and to the quadratic function differential or obtain by the quadratic function curve area surrounded, and acquisition the best writes laser power value, this method not only can be used for detecting as frame synchronizing signal the mensuration of frequency and C1 error parameter, also can be used for the mensuration as the jitter value parameter.
D the 4th embodiment
Optical data recording/reproducing device according to fourth embodiment of the invention will be described below.Be substantially similar to the optical data recording/reproducing device of second embodiment according to the structure of the optical data recording/reproducing device of the 4th embodiment, its difference is to measure best writing on the method for laser power value with controller 16.So, will measure the best method that writes laser power value by the controller 6 of the optical data recording/reproducing device of the 4th embodiment referring to Figure 45 explanation below, expression is used to measure the functional structure of controller 16 that the best writes the process of laser power value among the figure.
As shown in figure 45, the controller 45 among the 4th embodiment has Δ β value reservoir 300, and β available point detecting device 301 and the best write laser power value and measure part 302.
Described β available point detecting device 301 obtains Writing power-β characteristic of concerning between the represented β value on Figure 46 of the result that indication writes laser power value and obtain from OPC (a plurality of laser power values and corresponding to the β value of each laser power value) before normal recordings.In addition, as shown in figure 47, obtain the β value change amount that the indication per unit writes laser power value, i.e. the differential value Δ β of β value, and write the Writing power-Δ β characteristic that concerns between the laser power value.
Described β available point detecting device 301 detect β values and write concern between the laser power value in the difference of each several part, that is the β available point and the Δ β value information that is stored in the Δ β value reservoir 300 that, have effective change according to the β value of Writing power-Δ β characteristic.Described Δ β stores the 300 threshold value BTS that store the Δ β value that is used to detect the β available point that is obtained by previous experiment.As shown in figure 46, described β available point BT compares the part with less Δ β value with other parts.So, can be with the Δ β value that detects less than the part that is stored in the Δ β value in the Δ β reservoir 300 as the β available point.In the example of Figure 46, be β available point BT near the part that writes laser power value of 15-16mW.From Figure 47 as seen, the Δ β value of the part of β value available point (near the part that writes laser power value) is less than the value of any other parts.Described β available point detecting device 301 detect Δ β values less than the part of the threshold value BTS that is stored in the interior Δ β value of Δ β value reservoir 300 as β available point BT, and acquisition writes laser power value (lower limit PBK is to higher limit PBJ) corresponding to this β value available point BT.
In addition, except the threshold value BTS of the Δ β value that is used to detect β value available point BT, the threshold value BCS of Δ β value that is used to stipulate to write the possible range of laser power value is stored in the Δ β value reservoir 300.The best writes laser power value and measures part referring to Writing power shown in Figure 47-Δ β characteristic, and regulation writes the scope of laser power value, and (PBm1, PBm2), wherein Δ β value is greater than the threshold value BCS that is stored in the Δ β reservoir 300.Also have, the best writes laser power value mensuration part 302 mensuration and writes laser power value, this value writes laser power value PBK by what β available point detecting device 301 obtained corresponding to β value available point BT less than aforesaid, and belong to the scope PBm1 and the PBm2 that write laser power value, the laser power value that writes of Ce Dinging writes laser power value as the best thus.
Each device feature of controller 16 control optical data recording/reproducing devices in the 4th embodiment makes described record write laser power value with the best of said determination and carries out.In order to carry out record, make the CD that is write down have the laser power value of writing (be 15.5mW in the present embodiment, see Figure 47) and have the characteristic of the β value available point of effective change corresponding to the β value for CD with β available point characteristic.Therefore, can not obtain satisfied recording level in some cases.Yet, in the present embodiment, obtain Δ β value as mentioned above and detect the β available point, make write laser power value less than corresponding to the β available point write laser power value the time carry out record.So, thereby because the β available point can stop degenerating of recording level.
In addition, when obtaining Δ β value and being used to measure the best to write laser power value, other parameter (C1 error amount, frame synchronizing signal detects frequency, jitter value, deviate, reflectivity) can be used for measuring the best and writes laser power value.For example, when except Δ β value, going back the C1 error amount of application of frame synchronization signal detection frequency, be similar to the 4th embodiment obtains to write laser power value from Writing power-Δ β characteristic possible range.Also have, the possible range that writes laser power value can detect the frequency characteristic acquisition from Writing power-C1 error characteristics and Writing power-frame synchronizing signal.For example, as shown in figure 48, write the possible range Pm of laser power value from Writing power-C1 error characteristics regulation, and detect the possible range SPm that the frequency characteristic regulation writes laser power value from Writing power-frame synchronizing signal, can also write the possible range PBm of laser power value from Writing power-Δ β properties specify.In this case, can measure and be located at scope Pm, the laser power value that writes in the SPm, the scope KPm of the overlapping portion of BPm is that the best writes laser power value.
E improves example
Also have, the invention is not restricted to above-mentioned various embodiment, can also do following various improvement.
In each embodiment, carry out record with constant linear velocity CLV method, wherein Spindle Motor 11 drives CD D with constant linear velocity.Yet, can adopt with the CAV method of constant angular velocity driving CD D and carry out record.When adopting constant angular velocity CAV method to write down, when the outer circumferential sides that record position is tending towards coiling, line speed record increases.So, need change according to the change of line speed record and write laser power value.Therefore, when writing down, described CAV method comprises: in difference embodiment, need carry out writing as above-mentioned mensuration the best the process of laser power value for a plurality of line speed records; Obtain a plurality of writing speeds of indication and write the writing speed-the best that concerns between the laser power value to write laser power characteristics corresponding to the bests of a plurality of writing speeds; Quote described writing speed-best power characteristic; And change the best according to the change of line speed record and write laser power value.
In addition, at the second and the 3rd above-mentioned embodiment with improve in the example, obtain two or more parameters from the reproducing signal of test recording area, for example β value and C1 error amount (the 3rd embodiment), and the parameter that is obtained is quoted mensuration the best write laser power value.Yet, when the scarce capacity of the circuit that detects each parameter, and adopt and at full speed write down when obtaining the best and writing the identical high-speed reproduction recording areas of the writing speed of laser power value, then adopt the process of the identical a plurality of parameters of time measurement just can not catch up with reproduction speed.Therefore, can not accurately obtain such as β value and C1 error amount sometimes from reproducing parameter.So, the sample period of need proposition minimizing acquisition parameter (as, the cycle of twice).Yet when obtaining the C1 error amount, maximum C1 margin of error is 48 (normally 98), but has the problem of precision aspect.
Consider the OPC that utilizes high-speed record, promptly carry out the difficulty that OPC accurately obtains a plurality of parameters with high writing speed, then reproduce, and measure a plurality of parameters, thereby can obtain a plurality of parameters more accurately from the reproducing signal that low reproduction speed obtains with the speed that is lower than writing speed.
In addition, other method comprises: to carry out the record of OPC at a high speed; The reproduction of recording areas is carried out repeatedly; And average repeatedly reproducing the measured parameter of each reproducing signal obtained, to improve the measuring accuracy of parameter.Also have, first reproducing signal only is used to measure the β value, and second reproducing signal is used to obtain the C1 error amount.Adopt this method the reproducing signal that each obtained can be used to measure the parameter of arbitrary class.Certainly, can adopt the speed that is lower than writing speed to carry out a plurality of reproductions.
In addition, in different embodiment, for example use CD-R as using above-mentioned CD D.Yet the present invention also can be used for CD-RW, DVD-R, DVD random access memory (DVD-RAM), the record of (PC-RW) of phase transformation-rewriting etc.
Also have, for be used to carry out comprise that the best writes the controller 16 of recording process of the mensuration process of laser power value can be by the hardware circuit of special use, CPU (central processing unit) formations such as (CPU).When carrying out reservoir, for example read-only memory (ROM) store program the time, realize processing procedure by software.When carrying out processing procedure by software in this way, can be with different recording mediums, for example CD-ROM and Qi Nei record offers the user by the flexible plastic disc of the program of computer realization processing, perhaps for example the internet program is offered the user by transmission medium.
As mentioned above, according to a second aspect of the present invention,, all can reduce the generation recording error no matter desire writes down the difference of each optical disc product.

Claims (7)

1. method of determining the power that writes light beam that tracer signal is used on CD comprises:
Recording step, by before physical record in the presumptive test district of CD tracer signal carry out test record;
Reproduce step, from the presumptive test district reproducing signal of CD;
Produce first recording characteristic according to reproducing signal, wherein said first characteristic is represented the characteristic of β value as the function that writes light beam power, and the β value is according to the amplitude acquisition of reproducing signal;
Obtain second recording characteristic from first recording characteristic, wherein said second recording characteristic is represented the characteristic of Δ β as the function that writes light beam power, and Δ β representation unit writes the variation of the β value in first characteristic of quantity of power of light beam;
Determining step uses the preferable range of Δ β to determine the recording power scope according to second recording characteristic that obtains, and the preferable range of this Δ β is scheduled to for realizing preferred record, thereby determines to write the power of light beam in the recording power scope; And
Determine to write the preferred power of light beam according to first recording characteristic and in the recording power scope.
2. method according to claim 1 also comprises:
Produce the 3rd recording characteristic according to reproducing signal, the 3rd recording characteristic represents to write the relation between the power of light beam and in a plurality of qualitative parameter relevant with the characteristic of record at least one, and is that the percentage modulation laser beam of deviation, the reproducing signal of the frequency of the frame synchronizing signal in detection is included in the reproducing signal of CD, the shake that is included in C1 error in the reproducing signal, reproducing signal, reproducing signal is selected from the parameter group that the amplitude of the reflectivity of CD and reproducing signal is formed;
Wherein determining step comprises except second recording characteristic that is obtained and also determines the recording power scope according to the 3rd recording characteristic that is produced.
3. the method for claim 1, wherein said reproduction step comprise the read-out speed reproducing signal of the signal writing rate with less than test record the time.
4. the method for claim 1 is wherein reproduced step and is comprised by carry out repeatedly the recovery time on the test section and reproduce the step of a plurality of signals.
5. the method for claim 1, wherein said determining step comprises determines to be divided into upper side and than the recording power scope of downside, and described determining step also comprise with the preferred power that writes light beam determine determined recording power scope than downside within.
6. a utilization has the device that writes light beam tracer signal on CD of preferred power, and this device comprises:
The test record part, described test record part is carried out the test record of signal in the presumptive test district of CD before physical record;
Reproducing part is from the presumptive test district reproducing signal of CD;
Produce part, described generation part produces first recording characteristic according to reproducing signal, and described first recording characteristic is represented the characteristic as the β value of the function that writes light beam power, and the β value is according to the amplitude acquisition of reproducing signal; Described generation part further produces second recording characteristic from first recording characteristic, wherein said second recording characteristic is represented the characteristic of Δ β as the function that writes light beam power, and Δ β representation unit writes the variation of the β value in first characteristic of quantity of power of light beam; And
Determining section, described determining section use the preferable range of Δ β to determine the recording power scope according to second recording characteristic, and the preferable range of this Δ β is scheduled to for realizing preferred record, thereby determine to write the power of light beam in the recording power scope; And determine to write the preferred power of light beam according to first recording characteristic and in the recording power scope.
7. a utilization has the device that writes light beam tracer signal on CD of preferred power, and this device comprises:
The test record part, described test record part is carried out the test record of signal in the presumptive test district of CD before physical record;
Reproducing part is from the presumptive test district reproducing signal of CD;
Produce part, produce first recording characteristic according to reproducing signal, described first recording characteristic is represented the characteristic as the β value of the function that writes light beam power, and the β value is according to the amplitude acquisition of reproducing signal; Described generation part produces second recording characteristic from first recording characteristic, and described second recording characteristic is represented the characteristic as the Δ β of the function that writes light beam power, and Δ β representation unit writes the variation of the β value in first characteristic of quantity of power of light beam; Described generating unit branch produces the 3rd recording characteristic according to reproducing signal, described the 3rd recording characteristic represents to write the relation between the power of light beam and in a plurality of qualitative parameter relevant with the characteristic of record at least one, and is that the deviation of the frequency of the frame synchronizing signal in detection is included in the reproducing signal of CD, the shake that is included in C1 error in the reproducing signal, reproducing signal, reproducing signal, the percentage modulation laser beam that is added to laser beam are selected from the parameter group that the amplitude of the reflectivity of CD and reproducing signal is formed; And
Determining section, described determining section uses the preferable range of Δ β to determine the recording power scope according to second recording characteristic and the 3rd recording characteristic, the preferable range of this Δ β is scheduled to for realizing preferred record, thereby determines to write the power of light beam and according to first recording characteristic, second recording characteristic and the 3rd recording characteristic and determine to write the preferred power of light beam in the recording power scope in the recording power scope.
CNB2005101286647A 2001-02-05 2002-01-25 Optical disc apparatus with regulation of recording velocity and laser power Expired - Fee Related CN100423092C (en)

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