CN1971721B - Optical disk, reproducing apparatus for reproducing information from optical disk - Google Patents
Optical disk, reproducing apparatus for reproducing information from optical disk Download PDFInfo
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- CN1971721B CN1971721B CN2006101014191A CN200610101419A CN1971721B CN 1971721 B CN1971721 B CN 1971721B CN 2006101014191 A CN2006101014191 A CN 2006101014191A CN 200610101419 A CN200610101419 A CN 200610101419A CN 1971721 B CN1971721 B CN 1971721B
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Abstract
This invention provides a copy-protected optical disk (9), a reproduction apparatus (47) of the optical disk, a reproduction method of the optical disk, a production method of an original disk of the optical disk and a method of preventing an illegal program operation. An area in which a CP signal (24) having the center of an eye pattern deviated from the center of an amplitude is recorded is disposed at the back of a predetermined pattern signal in the optical disk. A reproduction apparatus additionally has the function of detecting an arrangement information (25) of the CP signal or a CP preceding signal (26), applying an offset voltage to a threshold value at the time of demodulation of an RF signal to a digital signal to change the threshold value, normally reproducing the signal having the center of the eye pattern deviated from the center of the amplitude, and stopping reproduction when a predetermined offset signal is not reproduced.
Description
The application be the applying date be submit on Dec 28th, 1994, division day be that July 26, application number in 2005 are 200510089569.0, denomination of invention divides an application for the application for a patent for invention of " a kind of CD and the regenerating unit of regenerating information from the CD ".
Technical field
The present invention relates to the anti-of recording medium and duplicate, relate in particular to CD with anti-copy function, this CD method for making and optical disk reproducing method, regenerating unit and CD disc master manufacturing method, prevent the method for pirate procedure operation.
Background technology
The general manufacture process of CD is from former dish, makes master (Master), stamper (Mother), mould (Stamper) successively and utilizes this mould then, comes massive duplication by ejection forming method.Sometimes also directly make mould from former dish.The former dish method for making of CD, generally be on the glass substrate of surface, to apply photoresist through grinding, use according to the laser of answering the recording information signal intensity modulated and make this photoresist sensitization, then, develop, form and the corresponding concavo-convex signal of this light sensitivity or groove or concavo-convex signal and groove.This concavo-convex signal or groove or concavo-convex signal and groove below are referred to as the signal groove.
Fig. 6 represents the block scheme of existing former disc recording apparatus.Focal point control laser optical system of using and the light beam amplifier that writes down the usefulness laser optical system etc. have been omitted.In Fig. 6, the integral body of former disc recording apparatus represents with 61A, the 1st, and laser instrument used in record, and the 2nd, photomodulator, the 3rd, catoptron, the 4th, lens actuators, the 5th, scribble the glass plate of photoresist, the 6th, Spindle Motor, the 7th, signal source, the 8th, record compensator.Signal by signal source 7 takes place utilizes record compensator 8 to make its pulse width produce a certain amount of variation, is input to then in the photomodulator 2, to carrying out intensity modulated from record with the laser that penetrates the laser instrument 1.This nighttide light after by intensity modulated, the lens through the control of focusing in catoptron 3 reflections and the scioptics regulator 4 expose on the photoresist on the glass plate 5.
The regenerating unit of CD focuses on semiconductor laser on the signal face of CD, utilize the handles such as photodiode of optical sensor to become electric signal (this signal calls the RF signal) from the catoptrical intensity transformation on the signal face, shape shaping after filtration, be demodulated to digital signal, carry out digital signal processing, bear original signal again.
Fig. 7 represents the block scheme of existing optical disk reproducing apparatus 47A.In Fig. 7, the 9th, CD, the 10th, optical sensor, the 11st, the main shaft horse is pressed and smooth, and 12A is the analog waveform shaping unit, and the 13rd, the digital demodulation part, the 14th, the digital signal processing part, the 15th, control section, the 16th, focus servo part, the 17th, tracking servo part, the 18th, the rotating servo part, 19A is the digital demodulation part that the RF signal is demodulated to digital signal, and 20A controls regeneration action integral body, and shows signal is delivered to the control section that display part 41 is gone.
Be demodulated to digital signal signal before, promptly the RF signal has eye pattern.Fig. 2 represents an example of eye pattern.Present small deviation (being called asymmetry) in the center of eye pattern and the amplitude in the heart.But, even certain deviation is arranged, also can when be demodulated to digital signal, utilize and be corrected as clipping lever Vs from normal moveout correction amplitude limiter circuit 31, shown in the wave table (9) of Fig. 3, can automatically detect the center voltage Vs of eye pattern and carry out amplitude limit.About the center of eye pattern, narration after treating.
Usually, asymmetry in order to reduce to regenerate when making former dish, is proofreaied and correct the dutycycle of the signal of former disc recording.It is balanced that this is called record.The optimum value of record equilibrium quantity, the development conditions when duplicating with groove, regeneration condition etc. and different with recording power.
In the existing CD, write down a reproducing signals of forbidding that prevents copy flag as logicality sometimes.So, write down the CD that prevents the copy flag signal, when its regenerated signal of record, can detect this and prevent the copy flag signal, to prevent this regenerated signal of record on pen recorder.But, the regenerating unit of ROM such as CD (ROM (read-only memory)) CD, the past does not prevent or forbids function from the regeneration of bootlegging medium.Past is sold the disk medium that only can write once and can regenerate always in common regenerating unit.But, if buy this disk medium, duplicate the regular CD of selling on the market, so, because its price is higher than the price of regular CD, the writing station price of perhaps duplicating usefulness is too high and universal.So, almost there is no need to take to prevent improper measure of duplicating.
Yet, in recent years, can recording game on the CD etc. software, write down the commodity CD of this Games Software, because of its software added value so its price is also higher than general music CD.On the other hand, the disk medium that only can write once and can on common regenerating unit, regenerate, price descends year by year.And former dish producing device also just can got easily.In this case, replicating disk low-cost situation in the higher CD of price has appearred.And, duplicate former dish wrongly and the chance that sells counterfeit CDs is also increasing.Therefore, under this situation, press for and prevent reproduction technology.
Summary of the invention
The object of the present invention is to provide optical recording media, optical disk reproducing apparatus, optical disk reproducing method, CD disc master manufacturing method with the copy function of preventing and the method for preventing pirate program run.
The method that the present invention is adopted for achieving the above object is: such posting field is set on CD, promptly should writes down the signal that makes eye pattern misalignment eye pattern amplitude center after the inherent compulsory figure signal in zone.If in regenerating unit, be increased in the function that detects the threshold value when changing the RF signal after certain picture intelligence and being demodulated to digital signal and no longer bear the signal that makes eye pattern misalignment amplitude center and just forbid the function of regenerating.Narration after treating about eye pattern center and amplitude center.
Born again and be transferred to the signal of digital signal from the zone of having write down the signal that makes eye pattern misalignment amplitude center by regenerating unit, it is regular signal, if by the signal record of demodulation to the disk medium that can record, then be registered as when regeneration eye pattern center situation of getting back to the amplitude center basically.Therefore, the threshold value when as if the regenerating unit change RF signal being demodulated to digital signal is also regenerated, and then can not bear regular signal again, and the regeneration action is stopped.So the CD that duplicates can not be regenerated, has the wrongful effect of duplicating that prevents.
Description of drawings
Fig. 1 is the block scheme that the 1st embodiment of expression optical disk reproducing apparatus of the present invention constitutes.
Fig. 2 is the eye pattern exemplary plot that CD does not have biasing usually.
Fig. 3 is that the 1st embodiment adds the eye pattern exemplary plot when CD is setovered.
Fig. 4 is the variation diagram of asymmetry when different recording power and record compensator among the 1st embodiment.
Fig. 5 is that the pen recorder example of the former dish of the 1st embodiment CD constitutes block scheme.
Fig. 6 is the block scheme that the pen recorder of the existing former dish of CD constitutes.
Fig. 7 is the block scheme of the formation of existing optical disk reproducing apparatus.
Fig. 8 is the key diagram as the tracer signal on the CD of optical recording media the 1st embodiment of the present invention.
Fig. 9 A and Fig. 9 B are respectively first half and the latter halfs that program flow diagram is prevented in the copy action among the 1st embodiment.
Figure 10 is the key diagram of 4 kinds of recording methods of the CP signal configuration information among the 1st embodiment.
Figure 11 is that the CD that accesses to your password among the 1st embodiment is checked process flow diagram.
Figure 12 is the bias voltage waveform figure when changing pulse width and laser power in the 1st embodiment.
Figure 13 A and Figure 13 B are respectively the parts of the block scheme of the former dish producing device (stamper (version) producing device) of the 1st embodiment and regenerating unit (record regenerator).
Figure 14 A and Figure 14 B are respectively the first half and the latter halfs of the process chart of 2 segmentation recording modes of the former dish of of the 1st embodiment.
Figure 15 is the process flow diagram that the interior dress of the 1st embodiment prevents the application software of reproducer.
(a) of Figure 16 be the 1st embodiment prevent replicating principle figure; (b) of Figure 16 be the 1st embodiment prevent replicating principle figure.
Figure 17 is the coordinate arrangement plan of address of each former dish of the CD that measures among the 1st embodiment.
(a) of Figure 18 is the time division way offset signal oscillogram of configuration detection method again of the 1st embodiment, (b) is the time division way offset signal oscillogram of configuration information method again of the 1st embodiment; (c) be the time division way offset signal oscillogram of configuration information method again of the 1st embodiment; (d) be the leaf branch mode offset signal oscillogram of configuration information method again of the 1st embodiment.
Figure 19 A and Figure 19 B are respectively first half and the latter halfs at the process flow diagram of the former disc recording biasing CD signal of the 1st embodiment.
Figure 20 is the block scheme of formation of the 2nd embodiment of optical disk reproducing apparatus of the present invention.
Figure 21 A and Figure 21 B are respectively the first half and the latter halfs of process flow diagram of program of the prevention copy action of the 2nd embodiment.
Embodiment
[the 1st embodiment]
The 1st embodiment of optical recording media of the present invention and the 1st embodiment of optical disk reproducing apparatus of the present invention are illustrated.
The present invention is blended in the tracer signal when making as the former dish of light ROM such as the CD dish of optical recording media with different special reproducing signals that prevent usually, makes special former dish, duplicates preventing.This special reproducing signals CP signal indication that prevents.Shown in Fig. 8 (a), on the CD of optical recording media the 1st embodiment of the present invention, the biasing CP of special pattern signal configuration information signal 25 (also can abbreviate the CP signal configuration information as) afterwards, for the center size in accordance with regulations that makes eye pattern departs from the amplitude center, be provided with and write down the CP signal 24 that makes dutycycle depart from standard value (the common 50%) (zone of 24a～24g).The center of the so-called eye pattern here is the part of best clipping lever (threshold value) in the analog waveform shaping unit when being equivalent in the regenerating unit regeneration.Moreover the amplitude center of so-called eye pattern is meant the center of the amplitude direction of how much mensuration.
In addition, also can be the go-ahead signal 26 of the CP signal of special pattern (26a～26g) be arranged in the lump on the preceding slightly position of each CP signal 24a～24g.(26a～26g) is for clearly expression to the CP signal go-ahead signal 26 of this special pattern; According to the time sequencing of regeneration, exist in its back make eye pattern the center in accordance with regulations amount of bias depart from the CP signal record zone at amplitude center.When being provided with, can only use one of them with above-mentioned CP signal configuration information 25.In addition, only use CP signal configuration information 25 to check to have or not the 2nd embodiment (Figure 20,21A and 21B) of CP signal to treat after narration, still, the 2nd such embodiment is different from the situation of only using CP signal configuration information 25 among the 1st embodiment.
Fig. 1 is the block scheme of the 1st embodiment of optical disk reproducing apparatus of the present invention.Have two kinds of devices in Fig. 1: a kind of device is to detect in CP signal configuration information regenerating section 27 after the CP signal configuration information 25 and CP signal go-ahead signal 26a～26g the two or one of them of the special pattern shown in Fig. 8 (a), makes the threshold value anti-change and the corresponding amount of bias V of afore mentioned rules amount of the level limiter 28 when the RF signal is demodulated to digital signal
SRAnother kind is that device is prevented in action, and its effect is to make the center of eye pattern only depart from the amount of bias V of the above-mentioned scheduled volume in amplitude center in incorrect regeneration
SRDuring signal, then judging it is copy, and stop regeneration, is under the situation of computer program in the data of having read perhaps, and the action of program is stopped.
In the block scheme of Fig. 1, regenerating unit is whole to be represented with 47, the 9th, CD, the 10th, optical sensor, the 11st, Spindle Motor, the 12nd, the analog waveform part, the 14th, the digital signal processing part, the 16th, focus servo part, the 17th, tracking servo part, the 18th, rotating servo part, the 19th, the transformable digital demodulation part of the threshold value when the RF signal is demodulated to digital signal, the 20th, control section, its effect is: control under regeneration the time has detected the situation of the CP signal configuration information 25 of special pattern or CP signal go-ahead signal 26a～26g, make above-mentioned threshold value only change amount of bias V in advance
SR
Make CD 9 rotations with Spindle Motor 11.Utilize optical sensor 10 that semiconductor laser is assembled on the signal recording surface of CD 9, utilize photodiode etc. that the intensity of reflected light of signal face is transformed into electric signal, to obtain the RF signal.Optical sensor 10 is controlled by focus servo part 16, makes focus aim at the signal face of CD 9 all the time.Utilize tracking servo part 17 to control simultaneously.Make the Focus tracking signal trajectory of semiconductor laser.
The RF signal carries out wave shaping by analog waveform shaping unit 12, makes it become square wave, is demodulated into digital signal by digital demodulation part 19, carries out digital signal processing by digital signal processing part 14, the signal that regeneration is original.Near the center that is centered close to amplitude of eye pattern and the eye pattern example that does not produce the common posting field of bias voltage be shown in the waveform 9 of Fig. 2.Ordinate is represented reflection light quantity among the figure, and upside represents that light quantity is big.Moreover, making the signal at eye pattern misalignment amplitude center according to enough big suitable bias voltage, the eye pattern example of its posting field is shown in the waveform 9 of Fig. 3.
The action of 20 pairs of regenerating unit integral body of control section is controlled, and sends instruction according to the signal of regenerating simultaneously and makes for the above-mentioned eye pattern center-biased voltage of answering in the tracer signal, changes the threshold value that digital demodulation part 19 is separated timing at short notice, i.e. Vs.This control part 20 both can constitute as shown in Figure 1, also can utilize CPU (central processing unit) to carry out programmed control, and it is moved according to the flow process shown in Fig. 9 A and Fig. 9 B.In addition, also can utilize general personal computer as control section 20.
Be provided with the posting field (the 1st posting field) of such signal on CD 9 of the present invention, promptly this signal makes the eye pattern center only depart from the amplitude center in the desired amount.On this CD 9, in near the amplitude center in eye pattern is centered close to a certain scope the common posting field, write down as the CP signal configuration information 25 of allocation list (24 essential configuration statuses of expression biasing CP signal) and the CP signal go-ahead signal 26 of specific pattern.The zone of writing down this signal 25 or 26 is as the 2nd posting field.If bear the CP signal configuration information 25 and the CP go-ahead signal 26 of this special pattern again, optical disk reproducing apparatus then of the present invention is judged as to have write down after this special pattern and deliberately makes the eye pattern center produce the biasing CP signal 24 that necessarily departs from.For this CP signal 24 of correctly regenerating, the analog waveform shaping unit 12 that the RF signal of output from the optical sensor 10 of Fig. 1 is demodulated to digital signal adopts following structure, be that analog waveform shaping unit 12 has from normal moveout correction amplitude limit electricity circuit 31 and the totalizer 31a that is arranged on its feedback network, can cross this totalizer 31a and be biased correction voltage, make clipping lever follow the variation at eye pattern center and carry out instantaneous variation.The effect that This move produced is: can adapt to the response speed bias voltage variation faster than the level limit value 28 in normal moveout correction amplitude limiter circuit 31.
Like this, can regenerate and after the special pattern signal, write down the zone of the signal that makes eye pattern misalignment amplitude center.In the regeneration in this zone, the threshold value V of the limiter 28 when the RF signal of regenerating unit is demodulated to digital signal
SR, change according to CP signal configuration information 25 or CP go-ahead signal 26 in advance, variable quantity is bias voltage Δ Vs.So, write down the eye pattern misalignment zone (the 1st posting field) of the signal at amplitude center and can correctly regenerate.
To be provided with the zone of biasing in order further stably regenerating, to be preferably in the zone (the 1st posting field) of having write down offset signal, promptly in the posting field of CP signal 24, also write down the go-ahead signal of special pattern.Near the signal 26h that represents with point the end of the posting field of the CP signal 24a that the go-ahead signal of this special pattern is meant at Fig. 8.Near the end of the posting field of other CP signals 24b, 24c..., also write down same signal.But among the figure with its omission.CP go-ahead signal 26a, 26b... forecast to the change of bias level that before each CP signal 24 this go-ahead signal 26h then is for before the common signal after the CP signal, once more the change (reinstatement attitude) of bias level were forecast.In other words, the 1st posting field that this go-ahead signal 26h represents to record the CP signal is supervised to turning back to original level and is prepared near finishing.That is to say that when regeneration this go-ahead signal 26h, optical disk reproducing apparatus of the present invention makes it turn back to common numerical value with regard to the instantaneous clipping lever that changes significantly when the RF signal is demodulated to digital signal.Be centered close near the zone of the common record the amplitude center with this eye pattern after special pattern of regenerating.Because the threshold value when the RF signal of regenerating unit 47 is demodulated to digital signal has turned back to common numerical value, so can correctly regenerate.
The signal of the special pattern of the threshold value when the energy change is demodulated to digital signal to the RF signal can be any signal.Send indication by the CP signal configuration information 25 of this Fig. 8 or the signal of special pattern, for example make threshold value be offset to+1, shown in Fig. 8 (c), beginning in the zone of another particular address An+1 from specific address An, making the minute surface that is centered close to amplitude one side (side that reflectivity is high) of eye pattern; Perhaps the amount of bias of threshold value is displaced to-1, shown in Fig. 8 (d), makes being centered close to of an eye pattern side opposite (side that reflectivity is low) with the amplitude minute surface.Also can be fixed as the direction of skew on some directions, only represent skew with 1,0.
Illustrated more than how the CD of the present invention with the signal area (the 1st posting field) that makes eye pattern misalignment amplitude center prevents to duplicate.When copying to the regenerating information of CD of the present invention can only write once and can utilize on the disk medium that common regenerating unit regenerates the time, utilize the regenerate information of CD of the present invention of regenerating unit, modulate according to the signal that is demodulated to digital signal and to write light inlet, can be written on the above-mentioned disk medium.
For the zone of having write down the signal that makes eye pattern misalignment amplitude center, in regenerating unit, be provided with from normal moveout correction amplitude limiter circuit (automatic electric-level limiter) 31, even change in duty cycle also can be from the normal moveout correction clipping lever.So, can change threshold value when being demodulated to digital signal automatically from normal moveout correction amplitude limiter circuit 31, thereby can regenerate as common correct signal.Therefore, for the CD that duplicates,, also be to write the common signal that the eye pattern center is positioned at the amplitude center substantially even in the zone of having write down the signal that makes eye pattern misalignment amplitude center.
As if the above-mentioned copy of regenerating with regenerating unit 47, then owing on regular CD, write down and had the bias at amplitude center that made the eye pattern misalignment, for example in the zone of the signal of Vs+ Δ Vs, the automatic electric-level limiter does not change the threshold value V when the RF signal is demodulated to digital signal
SRSo,, the signal that the eye pattern center almost is positioned at the amplitude limit center does not have amount of bias, therefore, can not be judged to be broken into regular CD.Regenerating unit 47 has a kind of like this device, if promptly having write down the zone of the signal that makes eye pattern misalignment amplitude center is present in the regular zone but can not correctly regenerates, so just stop regeneration fully, so can automatically stop regeneration or shut down procedure action.Like this, the program of copy can not be regenerated and move, and can prevent to use the CD of bootlegging.
CD generally is to outer ring helically tracer signal from inner ring.Compact discs (CD) etc. are provided with at inner ring and introduce zone, the index information of recording disk etc.CD of the present invention also is like this, if press shown in (a) of Fig. 8 like that, inner ring in the introducing zone 32 that is equivalent to CD is established the zone of having write down the CP signal that makes eye pattern misalignment amplitude center, and whether so, can judge immediately when beginning to regenerate is copy.
Below further describe and prevent version.The process flow diagram of Fig. 9 A and Fig. 9 B is made of following 3 subroutines: (1) prevents replicated setup information regeneration subroutine 40x, (2) offset signal is checked subroutine 40y, (3) make copy regeneration/program run stop subroutine 40z, in step 40a begin the to regenerate information of CD, for example, beginning regeneration calculations machine program.Below, as CD information with regeneration calculations machine program for for example with explanation.Wait to confirm whether be the CD that adapts to the CP signal at step 40b with the sign of TOC (TABLE OFCONTENTS), if be YES (being), then at step 40d, from obtaining CP signal configuration information 25 (shown in Fig. 8 (a)) the regenerated signal.Step 40e checks and has or not CP signal configuration information 25, just stops when not checking, and only just enters step 40f when CP signal configuration information 25 is arranged.
Begin to check biasing CP signal 24 in the configuring area of biasing CP signal 24 at step 40f, step 40g checks and has or not the CP signal, for example whether has the clipping lever of biasing.If in this zone, there is not the clipping lever of biasing, so just enter step 40r.If check that data are not all over as yet, then turn back to step 40f; If check that data are all over, then enter step 40p, be judged to be copy.If "Yes" in step 40g then enters step 40h, check in the part 33 amplitude, the period T of the biasing CP signal 24 of the data of confirming biasing CP signal offset information 25 and physical detection at the regular CD of Fig. 1.Whether the address is consistent with the angle position.
40i checks in step, and the result is a "Yes", then enters step 40j, and according to CP signal configuration information 25, Vs is added on the clipping lever forcibly the bias voltage Δ.At step 40k, check in the CP signal configures zone whether mistake or incorrect signal have taken place, during mistake more than step 40m takes place to a certain degree, just it is judged to be copy at step 40p.If at step 40m mistake more than certain program does not take place, then enters step 40n.If check that at this moment data are all over, then make the computer program operation of reading at step 40w; If check that data are not all over as yet, then turn back to step 40f.
Be judged to be at step 40p under the situation of copy, in step 40g, on display part 41, demonstrated " copy " printed words.Then, 40s withdraws from CD in step, makes program out of service at step 40t, makes numeral stop output, stops whole actions at step 40u.At this reason that step 40k mistake takes place is illustrated.Shown in CP signal 24a, the 24b of Fig. 8 (a), when bias voltage takes place to change significantly at short notice, do not catch up with from the FEEDBACK CONTROL response speed of normal moveout correction amplitude limiter circuit 31.We will take place mistake in therefore common electricity.
But, under the situation of the first embodiment of the present invention, utilize the biasing CP signal configuration information 25 of (a) of Fig. 8 or CP go-ahead signal 26a, 26b, 26c... to forecast that in advance the bias voltage of CP signal will change.According to this information of going ahead of the rest, the amount of bias correction signal generation part 29 of Fig. 1 is added to bias correction signal delta Vs in the feedback network of the clipping lever Vs of normal moveout correction amplitude limiter circuit 31 output 30.Therefore, at the initial change point of CP signal 24, owing to added bias correction signal delta Vs, so instantaneous clipping lever Vs just becomes to having added the numerical value of bias Vs the CP signal 24 of can normally regenerating, and mistake does not take place.The CD 9 of regular manufacturing is added with specific dutycycle, for example 50: 50,30: 70,70: 30 on the dish groove, so, shown in (b), (c) of Fig. 8, (d), additional bias voltage on the limiting voltage produces normal Vs, Vs+ Δ Vs, these three kinds of limiting voltages of Vs-Δ Vs Δ when regeneration.
So in the 1st embodiment of Fig. 1, according to biasing CP signal configuration information 25 or CP go-ahead signal 26, additional regular bias voltage on limiting voltage can not produce the regeneration of mistake ground thus.The kind of 25,34,36 expressions signal of the square frame among Fig. 1 and data, rather than circuit.Check in the part 33 at regular CD, inspection is checked on the position of the specified address 36 of CP signal configuration information 25, added by amount of bias correction signal generation part 29 on the position of signal of regulation bias voltage Δ Vs, whether produced error signal from error signal test section 38.And, check in the part 33 at regular CD and to confirm whether the normal signal code is born again by digital demodulation part 19.If regular CD, then checked result is correct, so can continue regeneration.If checked result is incorrect, then stops part 39 and send stop signal, just regenerated signal stops output or makes program run from regeneration/program.From the CD that the playback of data of regular CD 9 duplicates wrongly because can not replica bias voltage (can not correctly duplicate), so, be recorded in the bias voltage that does not have regulation on the address location of the defined in the CP signal configuration information 25.
Therefore, in the regular CD contrast part 33 of Fig. 1,, can identify illegal disk by being proofreaded to the bias voltage (physical values) measured with by CP configuration information 25 represented bias voltages (logical value).Moreover, Fig. 1 from normal moveout correction amplitude limiter circuit 31 usually when bias voltage is big, the operating frequency that can follow the tracks of is reduced to the response frequency f of bias correction control
0About.Shown in Fig. 8 (a), when the higher part of regeneration bias voltage and common when regional, according to f
0Above frequency is provided with, and bias voltage is changed.Like this, the clipping lever from normal moveout correction can be fixed on the higher direction of bias voltage.
So the zone of bias is limited in than on the high usually clipping lever usually.Carry out record with this higher bias voltage in the regular CD, mistake so do not take place in the regular signal of regenerating when making amplitude limit.
But, only take out regular optical disc data signal, the improper CD that duplicates, because can not replica bias voltage, so, can not produce bias voltage from the CP signal area but carry out amplitude limit by common clipping lever.Therefore, the regular signal of can not regenerating, but mistake takes place, and check being judged to be improper copy in the part 33 at the regular CD of Fig. 1, it is quit work.Moreover, shown in Fig. 8 (a), by be provided with+, 0 ,-these three kinds of go-ahead signal 26a, 26h, 26b (CP go-ahead signal 26a, 26b and go-ahead signal 26h), can forecast the data slicing level of next frame synchronizing signal, therefore, this bias voltage Δ Vs is added on the feedback signal of normal moveout correction amplitude limiter circuit 31 by the totalizer 31a in the feedback network that is arranged on Fig. 1, can be set at correct clipping lever in the moment change like this.
So, than under the high frequency of the tracking frequencies of normal moveout correction amplitude limiter circuit 31, even the clipping lever of regular CD changes, also can be all the time according to stipulate on the regular CD+, 0 ,-these three kinds of clipping levers carry out amplitude limit, thereby can regenerate regular signal and not make mistakes.
Usually, duplicate the logical signals such as " 101 " that the practitioner takes out CD-ROM, this logical signal is recorded on the former dish, make former dish, produce copy in a large number with this.When utilizing this logic signal levels to produce copy, can not replica bias voltage.So, the former dish of copy under the indeclinable situation of bias voltage in the posting field of each biasing CP signal.On the other hand, the data of CP go-ahead signal 26 intactly copy on the former dish of bootlegging.In regenerating unit that the CD that duplicates is packed into, right shown in Fig. 8 (a)+CP go-ahead signal 26a when keeping straight on regeneration, shown in Fig. 8 (c), the clipping lever of limiter 28 rises to+direction.In the CD that duplicates owing to do not write down bias voltage, so form the eye pattern that the nothing as Fig. 8 (b) shown in is setovered.When the clipping lever of limiter 28 during, can not export normal signal not at the center.
Yet, in the 1st embodiment of the present invention,, clipping lever forcibly is set in+direction according to CP signal configuration information 25 or CP go-ahead signal 26.Therefore, the digital signal of mistake is from the output from normal moveout correction amplitude limiter circuit 31 of Fig. 1, and error signal is exported from error detection occurs part 38, checks being judged to be the CD that duplicates in the part 33 at regular CD.Record makes the biasing CP signal record zone of the signal that must depart from the amplitude center in the eye pattern, by changing record compensator, at first makes pulse width, and promptly dutycycle changes, thereby can make simply.
Shown in the waveform (1) of Fig. 3, during negative level when duty cycle control signal is changed by period T 0, as shown in Figure 4, the record equilibrium quantity increases.So, present the dutycycle shown in the waveform (2) of Fig. 3, shown in the wave recording of Fig. 3 (3), the laser irradiation time that shines on the photoresist on the glass plate shortens, shown in the shape figure (4) of Fig. 3, (5), the formation dutycycle is little, and promptly the weak point and the degree of depth are the signal groove of λ/4 on trajectory direction.Shown in Fig. 3 (5), when regenerating the signal groove of lacking, reflection light quantity reduces lessly, so, shown in the waveform (6) of Fig. 3, can obtain the signal of mind-set positive dirction skew in the reflection light quantity.Shown in the waveform (9) of Fig. 3, can obtain such signal, minute surface one side of mind-set amplitude in its eye pattern, promptly the lateral deviation that reflectivity is high is moved, and this side-play amount is bias voltage Δ Vs.
In the case, the well-known of Fig. 1 carries out work from normal moveout correction amplitude limiter circuit 31, and clipping lever is automatically proofreaied and correct to add the Vs+ Δ Vs of bias voltage Δ Vs on clipping lever Vs.This state is shown in the waveform (7) of Fig. 3.If the regenerated synchronization signal cycle of modulation signal is decided to be T, then shown in the waveform (9) of Fig. 3, carry out amplitude limit by the signal level of 3T, therefore, can obtain the correct digital signal output of the 3T pulse width shown in the waveform (8) as Fig. 3.Like this, generation+Δ Vs bias voltage in limiter 28.On the contrary, if reduce to write down equilibrium value, promptly reduce " 1001 " amount, then as shown in Figure 4, dutycycle increases, and laser irradiation time increases, and is formed on signal groove long on the trajectory direction.If the big signal groove of regeneration dutycycle, then the signal of Huo Deing is shown in the waveform (d) of Fig. 8, and the bias voltage at its eye pattern center promptly moves bias voltage-Δ Vs to a side opposite with the amplitude minute surface lateral deviation that just reflectivity is low to negative direction.Write down and make the eye pattern center according to the CP signal record zone that the size of bias voltage Δ Vs departs from out the biasing CP signal 24 at amplitude center, the laser power that also can make record state according to the rules changes and makes simply.
As shown in Figure 4, if reduce recording laser power, even the suitable record equilibrium quantity during then according to common recording power also can make the signal groove reduce.When reproducing the small-signal groove, the overall reflective light quantity increases, the signal that is obtained shown in Fig. 3 (6), (9), mind-set amplitude minute surface one side in the eye pattern, promptly the lateral deviation that reflectivity is high is moved.On the contrary, if increase recording power, then as shown in Figure 4, even suitable record equilibrium quantity during according to common recording power also can increase the signal groove.When reproducing the large-signal groove, reflection light quantity reduces, shown in Fig. 8 (d), and the signal that is obtained, its eye pattern center is offset to a side opposite with the amplitude minute surface (side that reflectivity is low) according to the size of bias voltage-Δ Vs.
The relation at eye pattern center and amplitude center with the changing pattern of recording power and record equilibrium quantity be shown in Fig. 4.Transverse axis represents to write down equilibrium quantity, and the record equilibrium quantity is big more, and the pulse width of tracer signal is more little, and just dutycycle diminishes.The longitudinal axis represents that the eye pattern center leaves the amount of bias at amplitude center, promptly represents bias voltage amount Δ s with amplitude normalization with percentage, if reduce duty cycle control signal.The then high reflection side skew of mind-set in the eye pattern is so bias voltage Δ Vs increases to positive dirction.Recording power increases successively by the order of (a) and (b), (c).If the recording power of (a) is decided to be 1.0, then (b) is 1.1, is 1.2 (c).Waveform when changing recording power and dutycycle is shown in the waveform 1～7 of Figure 12.Like this, when changing laser power, necessary correction pulse width, qualification rate descends.If make well, then shown in waveform 5, can proofread and correct clipping lever by amount of bias, the digital signal of output shown in waveform 6, in this case, because qualification rate is low, so be difficult to duplicate.
The example that changes the pen recorder of this former dish that writes down the equilibrium quantity recording power in recording process is shown in Fig. 5.In Fig. 5, the integral body of former disc recording apparatus by 61 the expression, the 1st, the record use laser instrument, the 2nd, photomodulator, the 3rd, reflective mirror, the 4th, lens actuators, the 5th, applied the glass plate of photoresist 5a, the 6th, Spindle Motor, the 7th, signal source, the 21st, record compensator, the 22nd, control section.Control focus laser beam optical system of using and the light beam amplifier that writes down usefulness laser beam optical system etc. have been omitted among the figure.
Now utilize the process flow diagram of the block scheme of Fig. 5 and Figure 19 A and Figure 19 B that the method for making of former dish is described.Software of normally importing computing machine at step 50a etc. has enrolled the input data of the program that prevents reproducer in advance, in addition, at step 50b input CP signal configuration information 25, be divided into control signal and data in CP signal configuration information processing section 90, these data are checked with the input data in mixing portion 90a.On the other hand, control signal is admitted to control section 22, on the position of regulation duty cycle control signal takes place.Whether CP signal configuration information 25 is recorded the inner ring (introducing the district) of CD in advance by the operating personnel of former dish producing device decision, import with keyboard etc.At step 50c, check this input information, check whether it should be recorded in inner ring, only be judged to be under the situation of "Yes", just biasing CP signal configuration information 25 and record data are mixed at step 50d, record then and introduce the district.
Then, the data that should write down at step 50e opening entry.At step 50f, confirm the offset signal posting field according to biasing CP signal configuration information 25, at step 50g, as be judged to be "No", then at step 50i, carry out record by common dutycycle.If be judged to be "Yes",, divide 22a to change the dutycycle of the signal that is sent to writing laser according to biasing CP signal configuration information 25 by the CP signal generation then at step 50h.Be the dutycycle and the output of may command laser like this, make bias voltage become the waveform of regulation.At step 50j, when total data as yet record turn back to step 50f when not finishing; When the total data record finishes,, check whether above-mentioned biasing CP signal configuration information 25 is recorded in the outer ring district at step 50k.If in the time of not, finish at step 50p.If during "Yes", at step 50m, to the biasing CP signal configuration information of programming in advance and by stamper make amount, the cycle of the biasing CP signal of (Mastering) device 61 physical records, the deviation of configuration compares, revised.At step 50n, biasing CP signal configuration information posting field is arranged on the outer ring district 5b of former dish 5 shown in Figure 5, write down this correction data.Because stamper producing device 61 carries out cutting from inner ring to the outer ring, so after the total data record, also have the making result of biasing as data.The mode that writes down on the outer ring by the biasing CP signal configuration information 25 after this data correction, has the effect of the qualification rate that can increase substantially former dish manufacturing by record.
Utilize above method to write down to make the posting field of the signal at eye pattern misalignment amplitude center can form at an easy rate and not need existing former disc recording apparatus is carried out big transformation.CD of the present invention, its manufacturing process, except that the record of former dish, identical with CD in the past fully.So can in a large number production cheap products.
Comprise in the software of the present invention and prevent reproducer, prevent reproducing signals on the CD, optical disk reproducing apparatus has the copy function of preventing, so can stop the regeneration of copy or stop software work, can prevent copy in fact.In light ROM zone the example of record this biasing CP signal configuration information 25 be shown in Fig. 8 also can be as shown in figure 10, use RSA function shown in Figure 11 or elliptic curve function (ELLIPTIC CURVE FUNCTION) like that openly the function of key mode as folk prescription to function this information encryption, and be recorded in the magnetic recording area at the surface of light ROM district and CD or the back side.
Figure 10 is a kind of mode chart, its expression is measured the CP signal of offset signal mode shown in (a) of Fig. 8 and is adopted the (a) and (b) of Figure 16 and the CP signal of address illustrated in fig. 17-angle configurations information mode from CD 9, and produces the situation of CP signal configuration information 25.The example that the CP signal represented by circular and polygon is arranged on each bar track is shown on the CD 9 shown in the left side of Figure 10.The CP signal configuration information 25 that does not show among the figure also is recorded on the CD 9, encrypt with the CP signal configuration information 25 that the folk prescription shown in the step 60b of Figure 11 has been read to 42 pairs of function cryptography devices, by writing circuit 44 it is recorded on the outer ring 5d of the magnetic recording area 46 of CD and former dish 5 then.And also can record on the 2nd exposed portion 53 of former dish 5 of Figure 14 explanation, also can carry out record by the part 99 of bar code printing in the inner ring setting of CD 9.
The CP signal configuration information of locating to write down at light ROM part and magnetic recording area etc. 25 like this can not distorted under the situation of cipher key having.This is because owing to the password of working out to function with folk prescription, so, can not come according to the function of cryptogram decoding device the function of cryptography device is decoded.For example, when adopting usage shown in Figure 11, only understand the cryptogram decoding device owing to duplicate the practitioner, so, want to decode and must carry out the computing of 2 512 powers, and this computing need spend the time in millions of years.
About this point, further the process flow diagram with Figure 11 describes.Figure 11 represents to utilize folk prescription to come the copy operation program of password check to function.At step 60j establishment CP signal configuration information 25, utilize 512 cipher key at step 60b, encrypt with the RSA function, at step 60c this password is recorded on the CD.In the regenerate information of this CD of step 60d, then password is become common language at step 60e.Duplicate the function that the practitioner can understand the code data of step 60d, but, shown in step 60b and step 60d, for the function that in the open one-key communication mode the RSA function, is adopted, be that the mode that encoder is put upside down is used, so, in order to understand the function of scrambler, need very long operation time as mentioned above, promptly operation times reaches 2 256 powers.Therefore, can prevent to distort CP signal configuration information 25 in fact.At step 60f, to the CP signal 24 of the CD measured by step 60k and the CP signal configuration information 25 after becoming common language check, when checked result is inconsistent (when step 60g is "No"), the action of program is stopped at step 60h.When checked result is consistent (when step 60g is "Yes"), at step 60i, the action of executive routine.Moreover in example shown in Figure 11, CP signal 24 also can not be above-mentioned offset signal.So, in fact can not distort CP signal configuration information 25.
On the other hand, above-mentioned biasing CP signal as shown in figure 12, by the pulse width dutycycle of record compensator being adjusted or laser power adjustment being realized.But the relation of laser output and groove cave size is non-linear.So, can expect that when making the former dish of follow procedure specified configuration bias voltage, qualification rate descends.But, in example shown in Figure 11, according to the formation of the former dish producing device (also claiming the stamper producing device) 61 shown in Figure 13 A and Figure 13 B as can be seen, CP signal configuration information 25 and in mixer, mix from the logic ID of logic ID numbering generator 546, encrypt to function cryptography device 42 by folk prescription, it is recorded in the magnetic recording portion 46 of CD by magnetic recording circuit 44 and magnetic head 45.As mentioned above, this CP signal configuration information 25 can not be distorted.This encrypted message is regenerated by the magnetic head 45a and the magnetic regenerating section 48 of record regenerator 47, is decoded by cryptogram decoding device 43, and CP signal configuration information 25 is restored to the original state.In this case, with CP signal configuration information 25 is recorded optical recording is partly gone up and identical by shaven head 10 regeneration.And, address detected part 51 from the biasing voltage signal position detection part 52 of photo reversal part 50 and bias voltage VSO test section 34 and from the address or the CP signal configuration information 25 measured of angle information be admitted to regular CD and check in the part 33.Moreover Figure 13 A and former dish producing device (also the claiming the stamper producing device) 61 shown in Figure 13 B,, same, regenerating unit (record regenerator) was with shown in Figure 1 corresponding with shown in Figure 5 corresponding.
Regular CD is checked the process flow diagram of part 33 according to the program 49 of the illustrated prevention copy action of Fig. 9 A and Fig. 9 B, detects the CD that duplicates, and program behavior is stopped, and perhaps stops regenerated signal output.In the case, as shown in figure 15, the promoter program 70b in Application Software Program, program are installed subroutine 70d, print subroutine 70f, file is preserved among the subroutine 70h, enroll CD and check subroutine 70c, 70e, 70g, 70i.Thus,, make inefficacies such as preventing reproducer 70c, 70e even pirate practitioner resolves software, but only otherwise all for example 1000 subroutines all disappear, just can not duplicate.
The represented method of the example of Figure 13 A and Figure 13 B is: make the back at former dish the CP signal offset information 25 of the bias voltage of former dish etc. is encrypted with the unidirectional function, record then on the magnetic recording part 46 that is arranged on CD 9a.This record also can be shown in Figure 13 A and Figure 13 B CD 9b such, program and CP signal 24 are recorded on the 1st exposed portion 520 of former dish; CP signal configuration information 25 is recorded on the 2nd exposed portion 53 of former dish of outer ring part.Utilize Figure 14 A and Figure 14 B to describe this method in detail below.Former dish the 1st exposed portion 520 in operation 1,2 pairs of inner round portion of operation applies laser signal; utilizing shading diaphragm 54 in operation 3 is the 2nd exposed portion 53 of former dish that the outer ring part is covered, and makes the photoresist layer of the 1st sensitization part 55 carry out sensitization then.At this moment pass through corrosion in operation 4, form the groove figure, carry out actual measurement in 5 pairs of offset signals of operation; obtain biasing CP signal configuration information 25; encrypt, the shading diaphragm 54 of the 2nd sensitization part 56 is removed, above-mentioned code signal is write down up by the 2nd laser explosure in operation 6.Carry out plating in operation 7,8,9, make the former dish of metal, utilize this former dish to form processing, promptly can be made into optic disc base board, promptly can be made into the CD CD behind the formation reflectance coating on it.
By the 2nd exposure, the 1st exposed portion 520 of former dish is applied bias control signal randomly, carry out record, the configuration of qualified biasing CP signal is encrypted, record on former dish the 2nd exposed portion 53 of outer ring or inner ring.Therefore, have and not consider qualification rate and write down and make the extremely low effect that prevents reproducing signals of qualification rate.So do like this, be because want to duplicate the signal of millesimal qualification rate, just must make 1,000 former dishes, from economic angle, can not carry out this duplication service.
Moreover, in Figure 13 A and Figure 13 B, utilize anglec of rotation test section 58, rotary pulsed according to abridged FG among motor 57 and the figure (rotation sensing element), measure the rotation angle of configuration biasing CP signal, can make biasing CP signal configuration information 25a as shown in figure 16.Shown in the (a) and (b) of Figure 18, (c),, can detect the angle position more accurately by the rotary pulsed time of carrying out is cut apart.Shown in Figure 18 (c), (d), also can detect the configuration in address and offset signal and cycle.In the case, owing to be regular CD, so the biasing CP signal configuration information 25a that measures is correct.That is to say, on the position of address A4 ,+the signal record of period T 1 of bias voltage on the position of angle position Z3.And, prevent that reproducer from can not make the program of reading stop.But in the improper CD CD that duplicates of (b) of Figure 16,25c is different with regular data for biasing CP signal configuration information.This is because CD is the CLV record.Figure 17 represents experimental data, and it conclusivelys show actual CD address configuration each former dish is had nothing in common with each other.Even identical address, to different former dishes, linear velocity and orbit interval are also variant slightly, so the accumulation of error gets up, just produce very big difference.
Turn back to Figure 16, in regular CD, the angle configurations of biasing CP signal is Z3, Z2, Z1, Z4.But, in (b) of Figure 16, be Z3, Z2, Z4, Z3, tangible difference appears.Utilize the stamper manufacturing installation that can obtain at present, can't control this angle position exactly.This figure is reproducible not.And biasing CP signal configuration information 25a can not utilize folk prescription to change to the password of function.So, have and duplicate the practitioner and utilize the not very big effect of this CD of reproducible of existing apparatus (equipment).In addition, also can biasing CP signal configuration information 25 be recorded on the CD by the low reflecting part group of bar code shape.
＜the 2 embodiment 〉
According to Figure 20 and Figure 21 A and Figure 21 B optical recording media the 2nd embodiment of the present invention and optical disk reproducing apparatus the 2nd embodiment are described below.Go-ahead signal 26a～26h carries out record with CP signal configuration information 25 on the optical recording media 9 of Fig. 8.But, in the 2nd embodiment, do not need to write down go-ahead signal 26a～26h (, yet in regenerating unit, not detecting) even carried out record.
CP signal configuration information 25 utilizes folk prescriptions such as adopting the RSA function to encrypt in advance to the cryptography device of function.The process flow diagram of Figure 21 A and Figure 21 B, a lot of parts are identical with Fig. 9 B with Fig. 9 A, so, only different program steps is illustrated.At step 80d, utilize the cryptogram decoding device 43 in the digital demodulation part 19A, being transformed into common language, check at step 80e whether this common language is correct through the CP signal configuration information of encrypting 25.Owing to adopted the unidirectional function as RSA, so only otherwise the key of leakage cryptography device, other people just can not generate correct password.Therefore, at first can carry out the initial examination whether password is distorted, if the initial examination result is for being then to begin to check at step 80f whether CD is duplicate in this stage,, by being measured, CD checks with this to have or not kine bias to put the such CP signal of signal at step 80g.If there is the CP signal then to enter step 80h.Under the situation of only checking the address angle configurations, omit step 80g, enter step 80h.
Check the CP signal at step 80h, the method for checking has 2 kinds: a kind of is to utilize offset signal as the CP signal; Another kind is to utilize physical angle configuration information on the CD of particular address as the CP signal.At first, when using the CP signal of offset signal mode, measure the address location of offset signal configuration or the angle position on the CD, and whether the data of the data of check and inspection and the regular address location of this CP signal shown in the CP signal configuration information 25 or the regular angle position on the CD are consistent.Secondly, when using the CP signal of the angle configurations information mode of address on CD, be determined at the angle position that disposes on the particular address CD, check, check whether the two is consistent with the regular angle configurations information data shown in the CP signal configuration information 25.
At step 40e, when the result who checks is two kinds of data when inconsistent, can judge is copy, and the action of program is stopped, or stops the regeneration action.Only when check result is correct, just allow the regeneration action.The checking of Figure 21 A and Figure 21 B checks that operation also can carry out with the CD driver, also can carry out with the tabulation of operating system that is connected the microcomputer on the CD driver and application program.In the mode of Figure 21 A and Figure 21 B, adopted the cryptography device of unidirectional function, so can not distort CP signal configuration information 25.Therefore, attempting CP signal configuration information 25 is distorted even duplicate the practitioner, make the copy that has suitably formed CD CP signal and make inspection checked result and this CP aligned phase signal, also is impossible.So can prevent to duplicate.
The effect of invention
CD of the present invention and regenerating unit thereof have increased a kind of like this function: a kind of signal record zone is being set on the CD promptly after certain figure signal, the signal record that makes eye pattern misalignment amplitude center in this zone, in regenerating unit, by after detecting the signal of certain figure, deliberately apply bias voltage on the threshold value when the RF signal is demodulated to digital signal, make the signal at eye pattern misalignment amplitude center of sening as an envoy to of to regenerate with this, if can not bear this offset signal again, the regeneration action is stopped.
Moreover, utilizing regenerating unit sort signal born again and that be demodulated to digital signal in the posting field that has write down the signal that makes eye pattern misalignment amplitude center is common signal, if the signal record after the demodulation on Recordable optic disc media, then be registered as when regeneration the eye pattern center turn back to the amplitude center basically.Therefore, when applying bias voltage on the clipping lever of regenerating unit when the RF signal is demodulated to digital signal and regenerate, can not bear common signal again, and the regeneration action is stopped, so the CD that can't regenerate and duplicate, thereby can prevent wrongful duplicating.
Claims (1)
1. CD, this video disc recording has the tracer signal of sneaking into the CP signal, described CP signal is by coming record by the CP signal configuration information with a plurality of grooves that the precalculated position disposes on the circumference of CD, make the dutycycle of described CP signal depart from standard value by the length along the CD circumferencial direction that changes each described groove, described CP signal configuration information is recorded in the described CD by encryption.
Applications Claiming Priority (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33516593 | 1993-12-28 | ||
| JP335165/93 | 1993-12-28 | ||
| JP2219194 | 1994-01-20 | ||
| JP22191/94 | 1994-01-20 | ||
| JP10487994 | 1994-04-18 | ||
| JP104879/94 | 1994-04-18 | ||
| JP15608994 | 1994-07-07 | ||
| JP156089/94 | 1994-07-07 | ||
| JP299508/94 | 1994-12-02 | ||
| JP29950894 | 1994-12-02 |
Related Parent Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94191566A Division CN1126082C (en) | 1993-12-28 | 1994-12-28 | Optical recording medium, Reproduction apparatus of optical disk, reproduction method of optical disk, production method of original disk of optical disk, and illegal program operation stop method |
| CN 200510089569 Division CN1746990A (en) | 1993-12-28 | 1994-12-28 | Optical disk, and reproducing apparatus therefrom |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1971721A CN1971721A (en) | 2007-05-30 |
| CN1971721B true CN1971721B (en) | 2011-12-07 |
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Family Applications (5)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610099738 Pending CN1892840A (en) | 1993-12-28 | 1994-12-28 | Optical disk, reproducing apparatus for reproducing information from optical disk |
| CN2006101014191A Expired - Lifetime CN1971721B (en) | 1993-12-28 | 1994-12-28 | Optical disk, reproducing apparatus for reproducing information from optical disk |
| CN 200510089569 Pending CN1746990A (en) | 1993-12-28 | 1994-12-28 | Optical disk, and reproducing apparatus therefrom |
| CNB2005100895686A Expired - Lifetime CN100378809C (en) | 1993-12-28 | 1994-12-28 | Optical disk, and reproducing apparatus therefrom |
| CN2006101018328A Expired - Lifetime CN1909098B (en) | 1993-12-28 | 1994-12-28 | Optical disk and reproducing apparatus for reproducing information from the optical disk |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610099738 Pending CN1892840A (en) | 1993-12-28 | 1994-12-28 | Optical disk, reproducing apparatus for reproducing information from optical disk |
Family Applications After (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510089569 Pending CN1746990A (en) | 1993-12-28 | 1994-12-28 | Optical disk, and reproducing apparatus therefrom |
| CNB2005100895686A Expired - Lifetime CN100378809C (en) | 1993-12-28 | 1994-12-28 | Optical disk, and reproducing apparatus therefrom |
| CN2006101018328A Expired - Lifetime CN1909098B (en) | 1993-12-28 | 1994-12-28 | Optical disk and reproducing apparatus for reproducing information from the optical disk |
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| Country | Link |
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| CN (5) | CN1892840A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866692A (en) * | 1986-08-22 | 1989-09-12 | Hitachi, Ltd. | Method and apparatus for information recording and reproduction of a pit-shape-forming optical recording type |
| US5073925A (en) * | 1987-07-08 | 1991-12-17 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for the protection of signal copy |
| EP0545472A1 (en) * | 1991-12-02 | 1993-06-09 | Koninklijke Philips Electronics N.V. | Closed information system with physical copy protection |
| CN1085722A (en) * | 1992-09-14 | 1994-04-20 | 荷兰皇家·Ptt·有限公司 | Contain the system of at least one digital signal encoding device and decoder and coding and decoding device wherein |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5130864A (en) * | 1989-10-11 | 1992-07-14 | Matsushita Electric Industrial Co., Ltd. | Digital recording and reproducing apparatus or digital recording apparatus |
-
1994
- 1994-12-28 CN CN 200610099738 patent/CN1892840A/en active Pending
- 1994-12-28 CN CN2006101014191A patent/CN1971721B/en not_active Expired - Lifetime
- 1994-12-28 CN CN 200510089569 patent/CN1746990A/en active Pending
- 1994-12-28 CN CNB2005100895686A patent/CN100378809C/en not_active Expired - Lifetime
- 1994-12-28 CN CN2006101018328A patent/CN1909098B/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866692A (en) * | 1986-08-22 | 1989-09-12 | Hitachi, Ltd. | Method and apparatus for information recording and reproduction of a pit-shape-forming optical recording type |
| US5073925A (en) * | 1987-07-08 | 1991-12-17 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for the protection of signal copy |
| EP0545472A1 (en) * | 1991-12-02 | 1993-06-09 | Koninklijke Philips Electronics N.V. | Closed information system with physical copy protection |
| CN1085722A (en) * | 1992-09-14 | 1994-04-20 | 荷兰皇家·Ptt·有限公司 | Contain the system of at least one digital signal encoding device and decoder and coding and decoding device wherein |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1746990A (en) | 2006-03-15 |
| CN100378809C (en) | 2008-04-02 |
| CN1909098A (en) | 2007-02-07 |
| CN1909098B (en) | 2010-05-12 |
| CN1971721A (en) | 2007-05-30 |
| CN1746989A (en) | 2006-03-15 |
| CN1892840A (en) | 2007-01-10 |
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