CN100380460C - Optical recording medium, method and apparatus for recording/reproducing the same - Google Patents
Optical recording medium, method and apparatus for recording/reproducing the same Download PDFInfo
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- CN100380460C CN100380460C CNB2005101288924A CN200510128892A CN100380460C CN 100380460 C CN100380460 C CN 100380460C CN B2005101288924 A CNB2005101288924 A CN B2005101288924A CN 200510128892 A CN200510128892 A CN 200510128892A CN 100380460 C CN100380460 C CN 100380460C
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Abstract
An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.
Description
The application be submitted on April 2nd, 1997, application number is 97104993.9, denomination of invention is divided an application for the application of " method and apparatus of optical recording media, recoding/reproduction optical recording media ".
Technical field
The present invention relates to a kind of optical recording media, relate in particular to a kind of optical recording media of novelty of high density recording signal with swinging chute (wobbled groove).The invention still further relates to a kind of method and apparatus that writes down and/or reproduce this optical recording media.
Background technology
For example being used for what is called can write compact disk (compact disc recordalbe, CD-R) CD-R of system dish has swinging chute.The sector auxiliary information that comprises address information by the modulated wobble signal record.
Specifically, in CD-R record and/or transcriber, record and/or reproduce the luminous point convergence and close that detected carrier is the swinging signal of 22kHz on groove.Detect the serial data that comprises address information by FM demodulation swinging signal.
In the system of the importing end of sector, address information and recorded information time-sharing recording are so the signal of record becomes discontinuous signal in address arrangement.Use native system, data can continuous recording.This feature for focus on the interchangeable application of the continuous recording read-only optical disc of signal on be valuable.
Coming in the method for recording address information by modulated wobble signal, if the distance between the adjacent slot, promptly track pitch reduces, and then swinging signal just increases from the leakage of adjacent slot, and therefore, the S/N that has reduced swinging signal is than (signal to noise ratio (S/N ratio)).The carrier wave of the swinging signal that not only demodulation address information correctly, and Spin Control CD is required also becomes and is difficult to detect, and this has hindered dish is rotated control.
Owing to must reduce track pitch with tracer signal to high-density,, must correctly reproduce address information although therefore track pitch is very narrow.
And, in said system,, depend in carrier frequency and be basically on the order of magnitude of the wavelength of carrier wave from reproducing the record on the dish that address information obtains and/or reproducing the correctness of its position of point.On the other hand, carrier frequency (being hunting frequency) need be chosen to than low value, to avoid the adverse effect to tracer signal.Under the situation of CD-R, hunting frequency is 22kHz, and the wavelength on dish is 54 μ m.
If data write down discontinuously, interruption is promptly arranged, and data are recorded in then on the non-recording section, then must be recorded in data on the tram of dish.If can not carry out correct record, then need to provide so-called gap to absorb error from a record data unit to the record position of another record data unit, avoid overlapping between the record data.
Because the gap has reduced the recording capacity of CD, so gap length need reduce as much as possible.Yet above-mentioned accuracy is not enough.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of optical recording media, in this recording medium, although track pitch is narrower, but still correctly address acquisition information and CD Spin Control information, make signal record to high-density.
Another object of the present invention is to provide a kind of method and apparatus of recording/reproducing optical disk.
In one aspect, the invention provides a kind of optical recording media with swinging chute, pit is formed in the zone between the swinging chute circle with the interval of presetting.
On the other hand, the invention provides a kind of record and/or reproduce the method for the optical recording media signal with swinging chute, pit is formed in the zone of swinging chute between turn-taking with the interval of presetting.Recording method comprises the rotation of using the swinging signal control optical recording media that obtains from groove, use from pit detection to the position of pit detection record signal on optical recording media.
On the other hand, the invention provides a kind of record and/or transcriber, it comprises having swinging chute and be formed on the optical recording media of the pit in the zone between the swinging chute circle, the pick-up unit of swinging signal that detects described groove and the pick-up unit that detects the pit of pit with the interval of presetting, wherein, use from the position of recessed detected pit detection record signal on optical recording media by rotation from the detected swinging signal control of groove optical recording media.
Adopt said structure of the present invention, although track pitch is narrower, but still therefore the Spin Control information of address acquisition information and optical recording media correctly help high density recording.
Simultaneously can also improve the response speed of optical recording media and the reliability of Spin Control.For example, if only control the rotation of CLV dish by step pre-pit (land pre-pit), if because random access causes the marked change of linear velocity, then temporarily can not detect these pre-pits, so consume a large amount of time, until detect pre-pit once more, recover till the Spin Control.Utilize wobble pits and pit to solve this inconvenience simultaneously.
In addition, the present invention can obtain address information more accurately, and has the time precision higher than conventional art.
And, for optical recording media of the present invention, if read swinging signal and address signal with the single beam luminous point, then can detect all replay signal, servosignal (focus servo and tracking servo signal), swinging signal and address signal corresponding to tracer signal, therefore simplified data recording/reproducing device, and the manufacturing cost of data recording/reproducing device is reduced.
Description of drawings
Fig. 1 is the synoptic diagram that pit is formed on the example of oscillation centre line.
Fig. 2 is the oscillating quantity maximum, and pit has been formed on the synoptic diagram near the locational example of adjacent slot.
Fig. 3 is the schematic plan view of the major part of groove in implementing optical recording media of the present invention and pit one example.
Fig. 4 is the oscillogram from the pulse signal of pit acquisition.
Fig. 5 shows the general modulation of synchronous pattern and data pits.
Fig. 6 shows the example of address information recording form.
Fig. 7 is the circuit diagram of the example of signal reproduction circuit.
Fig. 8 is the oscillogram of replay signal one example when swinging signal frequency and pit frequency concern for integral multiple each other.
Fig. 9 be when swinging signal and pit each other with the oscillogram of phase time replay signal one example.
Figure 10 is the oscillogram that writes down replay signal one example of synchronizing signal in swinging signal and pit.
Figure 11 be when swinging signal and pit each other with the sequential chart of phase time.
Figure 12 is the block scheme of playback circuitry one example in the transcriber.
Figure 13 is the sequential chart when record synchronizing signal in swinging signal and pit.
Figure 14 is the sequential chart when holding the importing of pre-pit string judgment signal to insert as swinging signal.
Figure 15 is a kind of improved schematic plan view of groove and pit.
Embodiment
Optical recording media according to the present invention has the pre-groove of swing, and pit is formed in the zone that limits between these grooves with the interval of presetting.The pit combination of the swinging signal of groove and pit, to carry out high density recording.
Pit is formed in the zone that limits between the adjacent slot, promptly on the step (land).These pits can be the forms of general pit, perhaps can be formed on continuously between the adjacent slot, as the otch in the step of the adjacent step of interconnection.
These pits comprise the sector auxiliary information that comprises synchronous pit or address pit, and address information obtains from sector auxiliary information.Yet in the present invention, this sector auxiliary information is always unessential, thereby synchronous pit or address pit only need be provided.Pit is represented the starting position of sector auxiliary information synchronously, is formed by two pits close to each other, perhaps forms to have the pit length pit different with other pit length, therefore can detect them because they are different with remaining pit.
On the other hand, groove can have the swinging signal of single-frequency, perhaps can have the sector auxiliary information that is recorded address date by modulation.
Sector auxiliary information is and the sector of record data or a bunch of signal that is associated of a group record data sector that sector signals comprises synchronizing signal and/or address date.
The mode that above-mentioned groove or pit can be selected to make up is used, for example, have the groove of single-frequency swinging signal and the combination of pit or address pit synchronously, have the groove and pit or address pit combination synchronously that are record sector auxiliary information (such as synchronizing signal or address date) modulated wobble signal, perhaps have the record sector auxiliary information and the combination of the pit of the groove of modulated wobble signal and preset interval can be used.
In these combinations, if use the groove of swinging signal and pit or address pit combination synchronously with single-frequency, then synchronizing information and address information can be produced reliably by these synchronous pits and address pit, and CD Spin Control information then can be produced by swinging signal certainly.
If swinging signal is a simple signal, the frequency of any leakage signal from an adjacent slot and the signal frequency strict conformance that detects usefulness, so the influence of leaking is got the wobble signal amplitude that detects usefulness and made the slowly form of variation, therefore be not easy to detect the single-frequency that detects usefulness.
If use the groove that has for record sector auxiliary information (such as synchronizing signal or address date) modulated wobble signal, combination with synchronous pit or address pit, just can in groove and pit, double write down synchronizing information or address information, therefore guarantee the reliability of the accuracy of raising.
If when using the combination of groove and pit, groove position forms at random with respect to groove, worry that then the signal level of the replay signal that obtains changes with groove position, make to be difficult to correctly detect pit.Worry that also the circuit structure that produces clock in the transcriber becomes complicated.
In order to overcome this shortcoming, it is desirable to as shown in the formula determined, make the pass between hunting frequency fw (average frequency) and the pit frequency f p be tied to form the integral multiple relation:
M?fx＝N?fp
Wherein M and N are integer.
With different words, hunting period, Tw and pit period T p were each other in integer relation:
M?Tw＝N?Tp
Wherein M and N are integer.
Simultaneously, hunting period, Tw was average hunting period, and pit period T p is an interval, if pit forms at interval to equal one of many times of preset interval, then it equals this integral multiple that presets at interval.On the other hand,, think that then these two pits are single pit, when pit period T p is set, ignore the interval between these two pits if two continuous pits are synchronous pit.
If hunting frequency fw and pit frequency f p each other in the integral multiple relation, then can be unified into one to reference clock as mentioned above, perhaps use single voltage controlled oscillator, therefore, simplified the clock generating circuit of record and/or transcriber.
In addition, can utilize PLL from the signal of swinging signal generation, thereby can correctly detect pit with the pit cycle synchronisation.
Another kind of way, swaying phase and pit phase place can match each other, to carry out correct pit detection.
That is, by groove position is associated with the phase place that presets of swing, and form pit, can stablize the pit detection signal, correctly to detect pit with constant oscillating quantity (complications of groove are measured).
In this case, as shown in Figure 1, pit P can be formed at the oscillation centre position (corresponding to the position of minimum wobble amount) of groove G and locate.Another kind of way as shown in Figure 2, also can be formed on pit P near on adjacent slot, the position corresponding to the full swing amount.In the previous case, from the interference minimum of other groove, and under one situation of back, only just can detect pit with the signal level of not removing the swinging signal component.
If the sector auxiliary information that comprises synchronizing information or address information is recorded in the swinging signal, and pit has comprised the sector auxiliary information such as synchronous pit or address pit, then it is desirable to the synchronizing information and the sector auxiliary information of swinging signal, pit is each other in the position relation that presets especially synchronously.For example, the synchronizing signal of swing is along reproducing direction at leading pit of synchronous pit record in the cycle.
By the understanding of front to the position of the pit addresses sync section of swinging signal, it is synchronous more correctly to detect pit addresses, therefore can read pit addresses more reliably.
For the above-mentioned optical recording media of recoding/reproduction, utilize from the detected signal controlling CD rotation of swinging chute, use from be formed on the step pit detection to the position of information Control tracer signal.
(push-pull) method is recommended in utilization, can read swinging signal and pit simultaneously with the luminous point of same light beam, has simplified the structure of data recording/reproducing device.
Referring now to accompanying drawing, explain preferred embodiment of the present invention in more detail.
First embodiment
The CD of present embodiment is a write-once discs, and diameter is 12 centimetres, and it has the organic dyestuff recording film, can be that the laser beam of 636nm is carried out record with wavelength on this recording film.
CD is made by polycarbonate, makes step between guide groove and the guide groove adjacent turn by injection moulding.
The thickness of groove is about .25 μ m, and the degree of depth is about 70nm, outwards encloses from inner ring and forms continuous helicla flute, and recessed interval or gauge are about 0.74 μ m.
The swinging signal of single-frequency is as the information of the clock frequency of control CD rotations per minute and tracer signal record in addition.Swing means that groove is crooked slightly along disc radial.
In the present embodiment, crooked width is 20nm, and flexure cycles is about 30 μ m.Therefore, if CD rotates to reproduce swinging signal with the linear velocity of 3.5 meter per seconds, then frequency is about 120kHz.
On the step between the adjacent turn of groove, be formed with the pit (address groove) that is used for recording address information, as guide groove, well width is about 0.3 μ m, and the degree of depth is about 70nm.
Referring to Fig. 3, Fig. 3 schematically shows guide groove and address pit, and address pit 2 is with in the zone of interval shape between the adjacent turn of swing guide groove 1 of presetting.Address pit 2 forms between the adjacent turn of groove continuously, as the groove that radially extends along CD.
The address pit is associated with 1/0 of information, forms with the interval that is about 0.2mm.That is, calculated address pit on corresponding to the position of information 1, and on corresponding to the position of information 0 calculated address pit not.Therefore, the zero-address pit is arranged corresponding to 1/0 of information.
Fig. 4 shows the signal of the luminous point of light beam B along groove scanning acquisition.Specifically, obtain a kind of pulse of polarity by inner ring side address pit,, and obtain the pulse of another kind of polarity by side address, outer ring pit.As long as it is just passable to detect address information according to one of these two kinds of pulses.
In this register system, can suppose to cause to be difficult to detect the address pit if 0 generation continuously of information then continues to produce the state that does not have the address pit.In the present embodiment, recorded information is carried out bi-phase modulated in advance, 0 adjacent number is 2 to the maximum.
Yet, owing in synchronizing signal, be provided with the pattern 000111 of overshoot so that, in the synchronizing signal scope, have such part to the detection of synchronizing signal, on this part for three continuous channel bit recording address pit not.
Fig. 5 shows data bit modulation and example synchronous versions.Synchronized model is 0110001110001110, therefore, contains three 0 and 1 continuous channel bit, and this does not have in modulating rule.
The modulating data position makes 0 and 1 to correspond respectively to 1-0 and 0-1 like this, so can not contain 1 or 0 continuously at data division for three or more channel bit.
Fig. 6 shows the example of the record format of sector auxiliary information.Sector auxiliary information is formed by amounting to 208 channel bit, starts 16 channel bit and represents synchronous pattern.8 byte address data back are made the error correction parity bit with 4 bytes by the Reed-Solomon sign indicating number.
In this record format, owing to can proofread and correct 2 bytes of as many as with the parity bit of nybble, so, then can correctly detect address date if having two channel bit that error is arranged in 208 channel bit of sector auxiliary information.
Below, explain the signal reproduction of above-mentioned CD.Specifically, explain the method for reading the address signal of the swinging signal of groove and pit with a beam spots simultaneously.
Referring to Fig. 7, Fig. 7 is the block scheme of signal reproduction circuit, the Returning beam that is come by the beam spots B that is focused on the groove 1 carries out opto-electronic conversion by four sections PIN diode detecting device A, B, C and D, and carries out the I-V conversion, to produce signal A, B, C and the D corresponding to each diode.
For these signals, the replay signal of signal sum (A+B+C+D) expression tracer signal.Frequency response by 11 pairs of records of equalizer, reproduction compensates with signal, and convert binary signal to by binary conversion circuit 12, to produce replay signal, produce the clock of replay data by this replay signal by the PLL circuit of forming by phase comparator 13 and voltage controlled oscillator (VCO) 14.
If calculate A-B+C-D, then obtain the focus error signal of astigmatism system according to signal A, B, C and D.
Focus error signal is delivered to by phase compensating circuit 15 and is focused on driving circuit 16, from the focus drive signal of this circuit output control object lens focusing position.
If calculate A+B-C-D, then obtain the tracking error signal of push-pull system according to signal A, B, C and D.Because this signal is corresponding to the signal of the relative position of groove and beam spots B radially, so reproduced the swinging signal of groove simultaneously.On the position of calculated address pit, be in the inner ring side or in the outer ring side according to the address pit with respect to groove, detect positive pulse or negative pulse.These positive or negative pulses are included in the signal (A+B-C-D) similarly.
At first, this signal (A+B-C-D) only to take out tracking error signal, is delivered to tracking driving circuit 19 to this tracking error signal by phase compensating circuit 18, with the output tracking drive signal by low-pass filter (LPF) 17.
In order to detect the pulse signal that is produced by the address pit, the signal that suppresses less than 130kH with Hi-pass filter (HPF) 20 is with the The noise of the low-frequency range avoiding being caused by for example swing bending.
Because swinging signal is a narrow band signal, can obtain S/N than best swinging signal by the bandpass filter (BPF) 21 of arrowband so can utilize.Binary conversion circuit 22 converts the swinging signal that obtains to binary signal.Frequency comparator circuit 23 compares two level datas that obtain and reference frequency, produces the control signal of spindle drive motor.
As mentioned above, present embodiment can utilize four sections PIN diode detecting device to produce all required signals of signal reproduction.
Second embodiment
The various combinations of wobble pits are described in the present embodiment.
In first example, monotone wobble and the pit that has integer relation with the frequency of swinging signal are described.
Fig. 8 shows the signal that obtains in this case, according to this figure, as can be seen, detect pit Sp, promptly detect pit Sp at the time interval place that equals an integer pit period T p at the time interval place of the period T w that equals an integer swinging signal Sw.
In second example, pit and modulated wobble signal homophase form.In this example, pit is formed near on the position of adjacent slot, corresponding to full swing.As shown in Figure 9, pit Sp is positioned at the summit of swinging signal Sw, and has only the signal level according to pit Sp just can detect pit.
In Fig. 9, pit Sp is produced during following the tracks of by the pit that is formed on the groove inner ring side.On the other hand, pit Sp ' is produced by the pit that is formed on groove outer ring side.
In first example, after from pit, having removed swinging signal, detect pit with Hi-pass filter.In this example, make swinging signal pass through Hi-pass filter, by pit Sp that comprises swinging signal and detection level L are relatively detected pit.Its reason is, if the frequency band of swinging signal near the frequency band of pit, then can imagine, carry out frequency separation with Hi-pass filter and will meet difficulty.
In this example, the pit on the inner ring side of groove is being recorded corresponding to the position towards the full swing of the groove of inner ring.In this case, the pit of outer ring side is formed on the full swing position towards the inner ring side of outer ring side adjacent slot.
The swinging signal of appointment one circle of groove needn't be consistent each other with the swinging signal of an adjacent circle.Therefore, if the pit Sp of inner ring side pit is positioned at corresponding to the constant position of the value of swinging signal, then the pit Sp ' of the outer ring side pit that writes down relatively with another outer ring of groove is positioned at and the incoherent position of swinging signal.
Referring to Fig. 9, the peak value pointwise that is formed on the pit of the outer ring side pit of the incoherent position of swinging signal changes, and the peak value of pit Sp that is recorded in the inner ring side pit at constant swing position place is constant.
If peak value is constant,, just can easily detect peak value with simple peak holding circuit although the amplitude of pit changes, so, utilize detected peak value, just can remain on the pit detection level on the best level, so that carry out stable pit detection.This is an advantage for the situation that oscillating quantity forms pit basically unchangeably.
And, because pit Sp is positioned at the summit of swinging signal Sw, so the varying width maximum of the detection level that can tolerate.This is an advantage near the situation of adjacent slot for groove position also corresponding to full swing.
Figure 10 shows synchronizing signal Sws and is recorded in the swinging signal, and with the example of synchronous pit Ssp combination.
In this case, can know the position of synchronous pit Ssp in advance from the synchronizing signal Sws of swinging signal, to guarantee to detect more reliably synchronous pit Ssp.Advantage below from the various combinations of above-mentioned swing and pit, will obtaining.
The situation of swaying phase and pit homophase at first, is described.
Figure 11 shows the replay signal that obtains from this CD.Replay signal is made up of swinging signal Sw and the pit Sp that is subjected to noise component Sn influence.
Figure 12 shows the transcriber that reproduces swinging signal and pit with the block diagram form.
In this transcriber, swinging signal Sw is fed to binary conversion circuit 32 by bandpass filter 31, and pit Sp is fed to binary conversion circuit 34 by Hi-pass filter 33, to convert binary signal separately to.
Shown in Figure 11 B, binary conversion circuit 34 output pit Sp and noise component Sn.
Also further swinging signal Sw is delivered to phase comparator 35, with carry out the signal that 1/M * 100 frequency divisions obtain by 1/100 frequency divider 37 of the oscillation frequency of voltage controlled oscillator 36 and 1/M frequency divider 38 and carry out bit comparison mutually.With phase comparator 35 detected phase information control voltage controlled oscillators 35, form phaselocked loop, the result, voltage controlled oscillator 36 outputs are equivalent to the frequency Fo that (M * 100) multiply by swinging signal frequency Fw.
If the pass between hunting frequency Fw and the pit frequency Fp is Fw * M=Fp * N, then equals (N * 100) and multiply by pit frequency Fp by the oscillation frequency of Fo=Fw * voltage controlled oscillator 36 that (M * 100) provide.
Therefore, carry out frequency division, will obtain the phase information shown in Figure 11 C, and this phase information is outputed to pit phase-detection interpolating circuit 40 with the output of 39 pairs of voltage controlled oscillators 36 of 1 (N * 100) counter.
AND operation is carried out in output to phase information shown in Figure 11 C and binary conversion circuit 34, shown in Figure 11 D, can the cancellation noise component, and so will export bit data clock shown in Figure 11 E and the bit data shown in Figure 11 F.
Explanation now synchronously (sync) signal record in swinging signal and with the example of synchronous pit combination.
Referring to Figure 13, carry out frequency modulation for the swinging signal that illustrates by (a), and carry out demodulation, to obtain by the signal shown in (b).On the other hand, directly arrange the synchronous of presetting bit pre-bit after the swing shown in (c) synchronously, it is synchronous then can to detect presetting bit after the swing synchronous detection.
Swing itself is also accurate like that not as pre-pit (pre-pit).Yet, provide the pre-pit protection with can't help that pre-pit provides by system, can improve the security of pre-pit signal itself.
As the using method that is different from gating, as shown in figure 14, the importing end judgment signal of pre-pit string can be inserted by swing.
Consequently needn't form synchronous pattern, thereby improve the accuracy of pre-pit with prefabricated pit.Owing to needn't detect the synchronous pattern of pre-pit, so can save circuit.In addition, it is double that control circuit is arranged, so improved reliability.
Though preferred embodiment of the present invention is described above, it should be noted that to the invention is not restricted to these illustrative embodiment, and can comprise various changes or combination.
For example, address pit 2 can be designed to general pit.
If sector auxiliary information is recorded on swinging signal and the pit, then they can use independently of one another.For example, before tracer signal, can utilize the address information of pit, after tracer signal, can utilize the address information that writes down in the modulation condition of swinging signal.
Claims (5)
1. optical recording media comprises:
Form swinging chute in optical recording media, described swinging chute has sinusoidal shape, and described sinusoidal shape limits a plurality of hunting periods;
The stepped area of the medium between the adjacent turn of swinging chute; With
Be formed on the pit on the stepped area of contiguous described groove, only be formed on the position corresponding with the peak swing of the swinging signal of swinging chute at the described pit of a circle swinging chute one side, adjacent groove is approached in described position.
2. optical recording media as claimed in claim 1 is characterized in that, described pit and 1/0 associating information, and only be formed on the position corresponding with information 1.
3. optical recording media as claimed in claim 2 is characterized in that described pit is modulated in advance, makes in 1/0 information that continuous 0 number mostly is two most.
4. record and/or transcriber are used for record and/or reproduce a kind of optical recording media, and described optical recording media has form swinging chute in optical recording media, and described swinging chute has sinusoidal shape, and described sinusoidal shape limits a plurality of hunting periods; The stepped area of the medium between the adjacent turn of swinging chute; With the pit on the stepped area that is formed on contiguous described groove, only be formed on the position corresponding at the described pit of a circle swinging chute one side with the peak swing of the swinging signal of swinging chute, adjacent groove is approached in described position, and described device comprises:
Testing circuit has:
Photodetector, its detect since the push-pull signal of groove and pit beam reflected and
Hi-pass filter, it detects pit, and described pit is oriented to the steady state value corresponding to the swinging signal that reproduces from described swinging chute.
5. record and/or transcriber are used for record and/or reproduce a kind of optical recording media, and described optical recording media has form swinging chute in optical recording media, and described swinging chute has sinusoidal shape, and described sinusoidal shape limits a plurality of hunting periods; The stepped area of the medium between the adjacent turn of swinging chute; With the pit on the stepped area that is formed on contiguous described groove, only be formed on the position corresponding at the described pit of a circle swinging chute one side with the peak swing of the swinging signal of swinging chute, adjacent groove is approached in described position, and described device comprises:
Testing circuit has:
Photodetector, it detects the push-pull signal since groove and pit beam reflected,
Low-pass filter, it detects and follows the tracks of drive signal,
Bandpass filter, it with swinging chute detect for the spindle drive motor drive signal and
Hi-pass filter, it detects pit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8037896 | 1996-04-02 | ||
| JP080378/96 | 1996-04-02 | ||
| JP171528/96 | 1996-07-01 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971049939A Division CN1238849C (en) | 1996-04-02 | 1997-04-02 | Optical recording medium, method for recording/reproducing optical recording medium and apparatus for recording/reproducing optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1822119A CN1822119A (en) | 2006-08-23 |
| CN100380460C true CN100380460C (en) | 2008-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101288924A Expired - Lifetime CN100380460C (en) | 1996-04-02 | 1997-04-02 | Optical recording medium, method and apparatus for recording/reproducing the same |
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| CN (1) | CN100380460C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0347858A2 (en) * | 1988-06-20 | 1989-12-27 | Sony Corporation | Optical disc and recording and reproducing apparatus employing the optical disc |
| US5270998A (en) * | 1990-11-06 | 1993-12-14 | Pioneer Electronic Corporation | Rewritable recording medium and recording reproducing apparatus for use with rewritable recording medium |
| JPH06150327A (en) * | 1992-10-30 | 1994-05-31 | Sony Corp | Optical disk |
-
1997
- 1997-04-02 CN CNB2005101288924A patent/CN100380460C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0347858A2 (en) * | 1988-06-20 | 1989-12-27 | Sony Corporation | Optical disc and recording and reproducing apparatus employing the optical disc |
| US5270998A (en) * | 1990-11-06 | 1993-12-14 | Pioneer Electronic Corporation | Rewritable recording medium and recording reproducing apparatus for use with rewritable recording medium |
| JPH06150327A (en) * | 1992-10-30 | 1994-05-31 | Sony Corp | Optical disk |
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| Publication number | Publication date |
|---|---|
| CN1822119A (en) | 2006-08-23 |
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