CN1010445B - Optically readable record carrier for recording information - Google Patents
Optically readable record carrier for recording informationInfo
- Publication number
- CN1010445B CN1010445B CN 87107071 CN87107071A CN1010445B CN 1010445 B CN1010445 B CN 1010445B CN 87107071 CN87107071 CN 87107071 CN 87107071 A CN87107071 A CN 87107071A CN 1010445 B CN1010445 B CN 1010445B
- Authority
- CN
- China
- Prior art keywords
- record carrier
- interblock
- frequency
- information signal
- track
- Prior art date
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Abstract
The present invention relates to a record carrier 40 which comprises a radiation light sensitive layer which is arranged on a disc-shaped substrate 42 and is provided with an information recording area arranged in a spiral or concentric prefabricated track pattern 41. The track presents the track modulation form of radial swing, and the frequency is modulated by a position information signal Ip. In addition, the present invention discloses a device 1 for forming the track pattern during producing the record carrier. When an information signal Vi is recorded and the recorded signal is read out on the record carrier, the position information signal Ip is recovered by an FM demodulator 60 from the variation of scanning beams 54 and 54a produced by the track modulation. In addition, clock signals for scanning speed control are recovered from the variation of the scanning beams.
Description
The present invention relates to the record carrier that a kind of available optical means is read, this record carrier comprises the radiation/photographic layer that is located on the discoid substrate, and this radiation/photographic layer is provided with the interblock that is arranged to spirality or concentric rail pattern, this record carrier writes down and/or sense information in interblock by a radiation laser beam, and this interblock presents one-period property track modulation.
The invention still further relates to a kind of method of record of production carrier and relate to the equipment that is used to produce this record carrier, this equipment comprises the write device that writes the track pattern by a radiation laser beam; With a control device, be used for this write device is produced one-period property control signal, so that obtain the track modulation of its frequency corresponding to the frequency of this cyclic control signal.
The invention further relates to the equipment that is used at a recording information, this equipment comprises the device that scans this interblock by a radiation laser beam; One modulation device is in order to modulate this radiation laser beam according to an information signal; One has the optical system of detector, in order to survey in scanning process the radiation laser beam by this record carrier reflected or transmitted.
The invention still further relates to the equipment in order to the browing record carrier, record information signal in the interblock on this record carrier, this equipment comprises the scanning device that scans this interblock by a radiation laser beam with the sweep velocity of a substantial constant; One has the optical system of detector, in order to survey the radiation laser beam that is reflected or transmitted by this record carrier in scanning process; And one in order to derive the device that representative is recorded the information signal of information from be detected the radiation laser beam that device detects.
This record carrier and this equipment have been known in No. the 3rd, 100,421, the applicant's German prospectus all.
This known record carrier has a spiral path, and this track presents the track modulation of a constant frequency.During reading or writing down, when utilizing this radiation laser beam that this spiral path is scanned, this track modulation produces the modulation of a radiation laser beam.This modulation is detected out, and the modulation that detects thus derives a clock signal, and this clock signal is used to control this record and/or readout.
Have, each interblock all has spiral path again, is inserted with the synchronization zone between interblock.Interblock is in order to recorded information, and the synchronization zone comprises the positional information of form of the address of neighbor information recording areas.Positional information in the synchronization zone makes in the scanning process determines that by folded light beam which part of this record carrier has been scanned as possibility.This can be located a certain specific part of CD rapidly and accurately.
Yet the interblock of known record carrier has the shortcoming of constantly being interrupted by the synchronization zone.Particularly this is a unfavorable factor when the EFM-information encoded is desired to be recorded on this record carrier, because this recording method needs a unbroken interblock.
The object of the present invention is to provide a kind of device, make record EFM coded signal become possibility, and to make which that determine this record carrier by the record carrier beam reflected in scanning process partly be to be scanned as possibility.
According to a first aspect of the present invention, start defined that a kind of record carrier at this paper, it is characterized in that the frequency of this track modulation is modulated with a digital location information signal.According to a second aspect of the present invention, a kind of equipment that is used to produce this record carrier is characterised in that this equipment comprises frequency modulating device, in order to by a digital location information signal this control signal is carried out frequency modulation (PFM).According to a third aspect of the present invention, as defined above, a kind of equipment in order to recorded information is characterized in that, this recording unit comprises a frequency modulation (FM) demodulation device, in order to restore from the next location information signal of clock signal.According to a fourth aspect of the present invention, a kind of equipment in order to sense information of as defined above that is characterized in that, this readout equipment comprises a frequency modulation (FM) demodulation device, in order to restore from the next location information signal of clock signal.Read and/or recording process in that part of position of the CD that clock signal produced, is scanned is determined, and this signal can be recorded and/or be read out simultaneously.
In an embodiment of this record carrier, clock signal is used to be controlled at the sweep velocity that radiation laser beam in record and/or the readout scans this interblock, it is characterized in that, under the nominal scan speed of interblock, the frequency component that is produced in clock signal by digital location information signal is set at the outside of the frequency band that is used for speed control at least basically.The frequency component that produces owing to track modulation is set at the outside of the frequency band that is used for speed control, and the existence of these frequency components is not disturbance velocity control just.
In another important embodiment of this record carrier, interblock comprises the track modulation that is constituted that radially wobbles by the track of one-period property, it is characterized in that, this radially wobbles expresses this frequency modulation (PFM).The embodiment of another record carrier is characterised in that, this track is by being essentially spirality or the concentric ridged that is roughly constant width constitutes, and this ridged presents and describedly radially wobbles.
Another embodiment of this record carrier is characterised in that the width of ridged is greater than the mean breadth of its medial launder line.When the message structure that forms on ridged was read out, the influence at any erose edge of this ridged was reduced to minimum level, and the scrambling at the edge of this ridged can cause producing additional noise.
This record carrier with ridged track of constant width can be used a kind of like this method manufacturing, mould is along presenting a roughly concentric or spiral path that radially wobbles with a radiation laser beam in the method, the substrate that has the radiation photographic layer is scanned, and by thereafter the radiation photographic layer of substrate being developed the sweep test of this radiation photographic layer removed that the back obtains, the method is characterized in that, this Information Level is to scan along the path of a complementation of the track desired path on the record carrier that will be produced, has the track pattern and is produced by this mould for the record carrier of the complementary pattern of the track pattern of this mould.
Has in the method for record carrier of track pattern of ridged of constant width the groove line bottom on the corresponding mould in the top of this ridged in above-mentioned production.And to be very level and smooth surface by substrate constituted in the bottom of this groove line, makes that the top of correspondence of the ridged on the record carrier of making also is very level and smooth, produces a gratifying reflecting effect.Therefore, when reading the message structure of ridged top formation, can obtain a high signal level, thereby obtain gratifying signal to noise ratio (S/N ratio).
This record carrier can be produced with the alternative method of another kind, in this method, mould with a track pattern is to utilize a radiation laser beam, along one with this record carrier on needed pairing path, path with the spirality that radially wobbles or concentric track, the substrate that has the radiation photographic layer is scanned, what then local this radiation photographic layer of removing obtained by this radiation photographic layer is developed, obtain this record carrier by this track pattern that duplicates on the mould afterwards, the method is characterized in that this radiation photographic layer has only its unexposed part to be formed by the radiation photosensitive material that development is removed by a kind of.
Below by way of example to embodiments of the invention and advantage thereof, at length narrate to 8 with reference to accompanying drawing 1, wherein
Fig. 1 illustrates a kind of equipment in order to the record of production carrier according to the present invention;
Fig. 2 illustrates the signal Ip that equipment shown in Figure 1 produces;
Fig. 3 illustrates the frequency spectrum of the signal Ip among Fig. 2;
Fig. 4 illustrates according to a kind of record carrier of the present invention;
Fig. 5 illustrates a kind of equipment in order to recording information signal according to the present invention;
Fig. 6 illustrates a kind of equipment in order to the sense information signal according to the present invention; And
Fig. 7 a, 7b and 8 illustrate another embodiment according to record carrier of the present invention.
Fig. 1 illustrates a kind of equipment in order to the record of production carrier according to the present invention.This equipment 1 comprises a turntable 2, and this turntable is driven and rotated by a drive unit 3.The discoid substrate 4 that the one flat glass plate that for example has the photographic layer 5 of photic anti-feedback agent formation constitutes can be placed on the turntable 2.
Laser instrument 6 produces a light beam 7, and this light beam projects on the photographic layer 5.Light beam 7 at first sees through a deflection device 10.Deflection device 10 is that a kind of this device that utilizes can be with light beam deflection device of deflection in addition extremely accurately in a narrow range.A kind of acoustooptic deflection device of the suitable employing of Xu Shu equipment herein.Yet, also can adopt the deflection device of other selective type, for example a level crossing that can in a small angle range, pivot or an electrooptical deflection device.Dotted line is represented the boundary of this range of deflection among Fig. 1.Point to an optical record head 16 by deflection device light beams deflected 7.This optical record head comprises that a level crossing 17 reaches in order to focus the light beam in the object lens 18 on the photographic layer 5.This optical record head can move radially with respect to the substrate 4 that rotates by a driver 19.
Utilize above-mentioned optical system, light beam 7 is focused on sweeping on the described point 20 on the photographic layer 5, and the degree and the optical record head 16 of the deflection of the light beam 7 that the position of analyzing spot 20 is caused by deflection device 10 are determined with respect to the radial position of substrate 4.In position shown in the optical record head, deflection device 10 can be with analyzing spot 20 deflections within by a scope shown in the B1, and for such range of deflection, then this analyzing spot 20 can move by optical record head 16 and in by a scope shown in the B2.
In addition, equipment 1 also comprises a voltage-controlled oscillator 30, and this oscillator produces a control signal that is used for modulator 10.Sound modulator 10 is a kind of sound modulator of common type.This modulator is angle of beam deflection, and this angle is that the frequency of the control signal that provided by voltage-controlled oscillator 30 is determined.One for example is frequency modulator 32 generations one signal of Control of Voltage system oscillator, and the frequency f c ' of this signal uses the location information signal Ip that is produced by controller 21 to modulate.Controller 21 is the speed of the speed of accessory drive 3 and exciter component 19 by this way further, make radiation laser beam 7 along a spiral path with constant velocity sweeping photographic layer.This control system has exceeded scope of the present invention, therefore is not described in detail at this.
The binary signal that location information signal Ip is made up of the sequence of the bit location with logical value " 1 " or " 0 " forms, and this signal is represented a digital time information sign indicating number sequence.These temporal information characters always represent that the self-scanning operation has begun institute's elapsed time.The example of sort signal Ip is shown in Fig. 2 b, and the part of the temporal information character of being represented by signal Ip is shown in Fig. 2 a.This location information signal Ip presents one " two-phase " modulation.The digital signal that is applied is converted into binary signal then, in the digital signal that is applied is that the T/2 of logical one is in the time interval, this binary signal is being for just, next T/2 in the time interval then for negative, T is the bit period of the digital signal that applied.Logic " zero " produces opposite binary signal, promptly is negative during time interval T/2, and is positive such binary signal during next time interval T/2.This modulation technique produces the binary signal with distribute power frequency spectrum as shown in Figure 3.Frequency f o is corresponding to 1/T herein.
As seen from Figure 3, this " two-phase " modulation signal does not present strong frequency component in low-frequency range.Its advantage will be narrated hereinafter comprehensively.
Utilization is shown in the equipment among Fig. 1, along a spirality path photographic layer 5 is scanned, and, on a bit of distance within the scope B1, move back and forth this analyzing spot 20, it moves back and forth the output signal frequency fc ' that frequency is equivalent to frequency modulator 32, as a result, the spirality path of being described by analyzing spot 20 on photographic layer 5 shows a radial deflection, and this frequency of radially drifting about is modulated with time information signal Ip.This photographic layer is made up of photoresist.Then be developed removing in this radiation photographic layer through the photographic layer of so scanning, thereby obtain to have the mould of the spiral slot line of radial frequency modulation deviation (swing) by the scanned part of light beam b.
Subsequently, mould copies duplicate thus, and these duplicates are provided with radiation sensitization Information Level.Fig. 4 illustrates according to a record carrier 40 of the present invention, and this record carrier is produced with preceding method.
Fig. 4 a is the top view of record carrier 40.Record carrier 40 presents a track pattern, and this track pattern comprises that one has the spiral slot line 41 of the constant width that radially wobbles.For clarity sake, this spiral spacing is depicted turgidly with radially wobbling.In fact, the spacing of the adjacent circle of spirality path is usually 1 to 2 micron size order.In practice, this cycle should be able to make the frequency component that produces in read signal by radially wobbling be in the outside of the frequency spectrum of the information signal that is recorded carrier and/or reads basically during the information signal on the record carrier at browing record.If when writing down an EFM coded signal that meets common " compact disc " standard, a kind ofly radially wobble that to cause producing near 22 kilo hertzs and frequency shift (FS) be that 1.5 kilo hertzs frequency component is enough in read signal.The EFM coded signal that is recorded like this and radially wobble between just be difficult for each other influencing each other.
Fig. 4 b is the I-I cut-open view of this record carrier.This record carrier comprises a substrate 42, one radiation sensitization Information Levels 43, and a transparent overcoat 44.
Record carrier shown in Fig. 4 demonstrates a track pattern, and this pattern is made up of the spiral slot line with constant width.In this information carrier, information to be recorded provides in the groove line.Yet, find that in practice when use has a kind of like this record carrier of track pattern, promptly this track pattern is made up of the ridged of spirality or concentric constant width, when information is recorded on this ridged, can obtain better signal to noise ratio (S/N ratio).A kind of like this record carrier 80 is shown among Fig. 7 a and the 7b.With the information track that the form of ridged 81 is represented, part zone 82 only is shown in Fig. 7 a, this zone then is shown among Fig. 7 b after amplifying at high proportion.Fig. 8 is the sectional view of record carrier 80 VIII along the line-VIII intercepting in zone 82.Record carrier 80 comprises a substrate 83, one radiation photographic layers 84, and a transparent overcoat 85.
In record carrier 80, the diameter that is inserted in the groove line 86 between the ridged 81 is not constant, this is because the frequency modulation (PFM) radial deflection of this ridged 81 causes, therefore, the method for the record carrier of the track pattern of the groove line that comprises constant width narrated of the method for producing this record carrier and production drawing 1 is different.
A kind of like this track pattern with ridged of constant width can use with to method that Fig. 1 narrated similar methods and obtaining very.Yet under this situation, this photographic layer 5 must be made up of a negative photoresist rather than positive photoresist.After the photographic layer of being made up of this negative photoresist is developed, what be eliminated in the photoresist is unexposed portion rather than removes exposed portion like that with common positive photoresist, so just can obtain to present the mould of the track pattern of required ridged, be that available common mode is produced its duplicate by this mould.
Yet, when employing has the substrate 4 of the photographic layer 5 that common positive photoresist forms, also can obtain to have the record carrier of track pattern of the ridged of constant width, in this record carrier, when developing, removed the exposed portion of photographic layer.In this case, substrate 4 has the track pattern of the groove line of constant width, and the track pattern of the groove line of this constant width is the complementary pattern of track pattern of the ridged of needed constant width.The direction that rotates of rotate direction and the needed track pattern of the track pattern of this complementary groove line is opposite, therefore in order to obtain to have the substrate of complementary rails pattern, only need be when scanning substrate 4, select its rotation direction to make direction of rotation in the process of itself and browing record carrier 80, then the process of scanning substrate 4 can with as the same procedure of Fig. 1 narration controlled.
After scanning, in the developing process of photographic layer 5, the sweep test of this photographic layer also is eliminated, and generation one has the mould of complementary rails pattern.The so mould that obtains and any duplicate of duplicating of mould thus all can be used as the negative film of the record carrier 80 of producing the track pattern with the ridged that comprises constant width.
The production of in the end mentioning has in the method for record carrier of track pattern of ridged, the bottom of groove line in the corresponding mould in the top of the ridged on the record carrier of producing like this.The bottom of groove line is made up of the very level and smooth surface of substrate 4, and this substrate normally is made of glass.As a result, the top of the correspondence of made record carrier also is very level and smooth, thereby has very high reflectivity, produces a high signal level and also therefore obtain gratifying signal to noise ratio (S/N ratio) in readout.
When the ridged of the constant width on the record carrier is wideer than medial launder line, even can obtain better signal to noise ratio (S/N ratio), the influence at the formed any irregular edge of this ridged can be reduced to minimum level, and this irregular edge can cause producing additional noise in readout.
Fig. 5 illustrates a kind of equipment 50 according to the present invention recording information signal Vi on record carrier 40.This equipment 50 comprises a drive unit 52, is placed on record carrier 40 on the turntable 51 in order to rotation.
One radiation source 53 produces a radiation laser beam 54, in order to scanning groove line 41.Then, make radiation laser beam 54 point to record carrier 40 through a modulation device 55 and half transparent flat mirror 56.Utilize modulation device 55, the intensity of light beam 54 can be modulated according to information signal Vi to be recorded.With such method, groove line 41 places in Information Level 43 form the information pattern that available optical means is surveyed.Then, modulated light beam 54 is partly reflected by this Information Level 43, surveys by 57 pairs of these folded light beams of a detection circuit.Detection circuit 57 produces an output signal that comprises the frequency component that produces by radially wobbling.This output signal is by a bandpass filter 58 filtering, and this wave filter mainly transmits the frequency component that causes by radially wobbling.The instantaneous frequency fs of this output signal is as the measuring-signal to speed, and record carrier is (sweep velocity) that is scanned by light beam 54 with this speed.The output signal of bandpass filter 58 is applied on the control circuit 59, to produce a control signal that is used for drive unit 52.Control circuit 59 is by the velocity of rotation of these drive unit 52 controlling recording carriers 40, so that keep this instantaneous frequency fs to be substantially equal to a reference frequency fref.Control loop in order to the formation like this of controlling recording carrier scanning speed has a limited bandwidth, makes that having frequency component can not influence this control procedure in the rapid variation of frequency of this instantaneous frequency fs of the outside of this limited bandwidth.As previously mentioned, in order to the equipment 1 of producing this record carrier, the frequency that radially wobbles is modulated with a location information signal Ip, and signal Ip does not demonstrate any strong frequency component in low-frequency range.If it is adaptive each other in such a way to be used for the frequency spectrum of the frequency band of gated sweep speed and this location information signal; Making this frequency spectrum is to be among this frequency band without any frequency component almost, and then radially wobbling used FM modulation just can not influence this controlled sweep velocity.
When EFM coded signal that record is consistent with MD mini disk, be about 22 kilo hertzs reference frequency fref for one, the bit frequency of its location information signal is about 3000 bps, reaches the speed control bandwidth and is about 100 hertz, has obtained gratifying result.
This location information signal Ip restores from the output signal of wave filter 58 by a FM demodulation circuit 60.What this location information signal Ip expressed the groove line 42 of expressing with playing time is scanned the position of part with respect to the beginning part of groove line.Location information signal Ip is particularly useful for determining the position of such rail portion, and the position of this rail portion is for storing the position of an information signal to be recorded.The position of determining this rail portion has exceeded the framework of the present definition, therefore, and not in this further narration.
Fig. 6 illustrates the equipment 70 in order to the information signal Vi of playback record on record carrier 40 according to the present invention, represents with identical label with the element corresponding elements of equipment among Fig. 5 50.In equipment 70, it is to scan by the radiation laser beam 54a that radiation source 53a produces that note has the record carrier 40 of information signal Vi.The intensity of radiation laser beam 54a must be very low, makes it to make this Information Level 43 to produce the variation of optical property aspect and make established information pattern not to be rewritten.Information pattern modulation in having the spiral slot line that radially wobbles is also then reflected this radiation laser beam 54a.The radiation laser beam 54a that is reflected and modulates is surveyed by a sensitive detection parts 57a.Sensitive detection parts 57a comprises that the modulation to the light beam that produces by radially wobbling has the first of higher sensitivity and the modulation of the light beam that produced by the information pattern had the second portion of higher sensitivity.This sensitive detection parts were described in detail in No. the 3100421st, aforementioned German prospectus.Signal that first produces by sensitive detection parts 57a is applied on the wave filter, in order to remove by radially wobbling and by frequency component that speed control produces, making information signal Vi become on the output terminal of wave filter 71 can utilize.As the same procedure that reference Fig. 5 is narrated, sweep velocity is controlled by control circuit 59, and location information signal Ip is then by utilizing FM demodulation circuit 71 to restore.Afterwards, this signal Ip for example in the process of reading the information that is recorded, can be used for determining record carrier specific part the position or can be used for showing playing time.
In aforementioned, narrate as two separate equipment in order to the equipment and the equipment that is used to read the information that has been recorded of recorded information.Clearly, for the person of ordinary skill of the art, can easily these two equipment be combined is used to the single equipment that writes down and read to form one.
In aforementioned, for this is read with recording unit in sweep velocity control and a track modulation that radially wobbles form be provided.Obviously, other track modulation also is applicable to this purpose, for example those track modulation described in German publication application No. 3100278 (PHN9667) and No. 3100421 (PHN9666).Must act with caution for obtaining a suitable track modulation, make and only can from the scanning light beam modulation that is caused by information signal Vi, differentiate, and the frequency component of these scanning light beam modulation be to be in the outside that is used for the sweep velocity controlled frequency basically by the scanning light beam modulation that this track modulation produced.
Claims (13)
1, the record carrier read of a kind of available optical means comprises the recording layer that is located on the discoid substrate, and the interblock of spirality of being arranged to or concentric rail pattern is arranged on this recording layer; Described record carrier writes down and/or sense information in interblock by a radiation laser beam; This interblock presents one-period property track modulation, it is characterized in that, the frequency of this track modulation is modulated with a digital location information signal.
According to the described record carrier of claim 1, it is characterized in that 2, described digital location information signal does not present strong frequency component in low-frequency range.
3, according to claim 1 or 2 described record carriers, it is characterized in that, described location information signal express when scanning be when finishing with rated speed, from the beginning of track pattern to the local so required time of a segment distance that this positional information occurs.
4, according to each described record carrier in the aforesaid right requirement, its block of information has makes this orbital period property radially wobble the track modulation of form, it is characterized in that, described periodic radial swing shows this frequency modulation (PFM).
According to the described record carrier of claim 4, it is characterized in that 5, this track is made up of the cardinal principle spirality or the concentric ridged that is roughly constant width, this ridged shows and describedly radially wobbles.
According to the described record carrier of claim 5, it is characterized in that 6, the width of described ridged is big than the mean breadth of medial launder line.
7, a kind of method of producing the mould of the record carrier that available optical means reads, described record carrier comprises the recording layer that is located on the discoid substrate, the interblock at spirality of being arranged to or the concentric edge that constant width is arranged is arranged on this recording layer, and described width is greater than the mean breadth of medial launder line; Described record carrier writes down and/or sense information at interblock by a radiation laser beam; This interblock presents the swing of one-period property, and its hunting frequency is modulated by a digital location information signal; In described method, described mould is provided with a track pattern, and this track pattern scans the substrate that has the radiation photographic layer and obtains along the concentric or spiral path that radially wobbles that is roughly with a radiation laser beam; Subsequently the radiation photographic layer of substrate is developed and remove the sweep test of this radiation photographic layer; It is characterized in that described Information Level is scanned along such paths: this path be one with described record carrier on the path of needed orbital path complementation.
8, a kind of method of producing the mould of the record carrier that available optical means reads, described record carrier comprises the recording layer that is located on the discoid substrate, the interblock that spirality of being arranged to or the concentric ridged that constant width is arranged are arranged on this recording layer, the described mean breadth of stating width greater than the medial launder line; Described record carrier writes down and/or sense information at interblock by a radiation laser beam; This interblock presents the swing of one-period property, and its hunting frequency is modulated by a digital location information signal; In described method, described mould is to obtain by the substrate that has the radiation photographic layer is scanned, and described radiation photographic layer has spirality or the concentric orbital path that radially wobbles that is on the record carrier to be produced; Subsequently described radiation photographic layer is developed and local this radiation photographic layer of removing; It is characterized in that described radiation photographic layer is made up of such radiation photosensitive material: this material have only its not exposure part can remove by development.
9, a kind of equipment of producing the mould of the record carrier that available optical means reads, described record carrier comprises the recording layer that is located on the discoid substrate, and the interblock of spirality of being arranged to or concentric rail pattern is arranged on this recording layer; Described record carrier writes down and/or sense information at interblock by a radiation laser beam; This interblock presents one-period property track modulation, and its frequency is modulated by a digital location information signal; Described equipment comprises a write device, in order to write described track pattern by a radiation laser beam; Also comprise a control device, be used to produce the one-period property control signal of using for write device, to obtain the frequency respective track modulation of its frequency and this cyclic control signal; It is characterized in that this equipment also comprises frequency modulating device, be used for described control signal being carried out frequency modulation (PFM) with a digital location information signal.
10, according to the described equipment of claim 9, it is characterized in that, this equipment comprises in order to produce the device of a digital location information signal, described digital location information signal express when scanning be when finishing with rated speed, the local so required time of a segment distance from the beginning of track to this digital positional information of record.
11, a kind of equipment of the recording information of reading in available optical means, described record carrier comprises the recording layer that is located on the discoid substrate, and the interblock of spirality of being arranged to or concentric rail pattern is arranged on this recording layer; Described record carrier writes down and/or sense information at interblock by a radiation laser beam; This interblock presents one-period property track modulation, and its frequency is modulated by a digital location information signal; Described equipment comprises with one and writes the device that radiation laser beam scans described interblock, so that be scanned the record mark pattern that writes down out in the part corresponding to information signal in this recording areas; Also comprise an optical system that has detector, in order in scanning process, to survey radiation laser beam by described record carrier reflection or transmission; It is characterized in that this recording unit comprises a FM demodulator part, in order to restore from the next location information signal of clock signal.
According to the described equipment of claim 11, it is characterized in that 12, this equipment also is provided with the device that described clock signal and a reference signal are compared, and come the device of gated sweep speed according to the comparative result that this comparison means is done.
13, a kind of in order to read the equipment of the record carrier that available optical means reads, described record carrier comprises the recording layer that is located on the discoid substrate, and the interblock of spirality of being arranged to or concentric rail pattern is arranged on this recording layer; In this recording areas, the track modulation frequency of information signal that presents the interblock of one-period property track modulation is modulated by a digital location information signal; This equipment comprises the one scan device, is used for by the speed of a radiation laser beam with constant described interblock being scanned; Also comprise an optical system that has detector, in order in scanning process, by means of in order to from the radiation laser beam that is detected by this detector, to derive the device that representative is recorded the information signal of information, survey radiation laser beam by described record carrier reflection or transmission; It is characterized in that this arrangement for reading comprises a FM demodulator part, in order to restore from the next location information signal of clock signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107071 CN1010445B (en) | 1987-10-03 | 1987-10-03 | Optically readable record carrier for recording information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107071 CN1010445B (en) | 1987-10-03 | 1987-10-03 | Optically readable record carrier for recording information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87107071A CN87107071A (en) | 1988-04-13 |
| CN1010445B true CN1010445B (en) | 1990-11-14 |
Family
ID=4815955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87107071 Expired CN1010445B (en) | 1987-10-03 | 1987-10-03 | Optically readable record carrier for recording information |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1010445B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382160C (en) * | 1997-08-16 | 2008-04-16 | Lg电子株式会社 | Information recording medium |
-
1987
- 1987-10-03 CN CN 87107071 patent/CN1010445B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382160C (en) * | 1997-08-16 | 2008-04-16 | Lg电子株式会社 | Information recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN87107071A (en) | 1988-04-13 |
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Free format text: CORRECT: PATENTEE; FROM: N.V. PHILIPS OPTICAL LAMP MANUFACTURING COMPANY TO: N.V. PHILIPS OPTICALLAMP LTD., CO. |
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Patentee after: Philips Electronics N. V. Patentee before: N.V. Philips' Gloeipenfabrieken |
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| CP01 | Change in the name or title of a patent holder |
Patentee after: Koninklike Philips Electronics N. V. Patentee before: Philips Electronics N. V. |
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| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Fortune (Jiangsu) Multimedia Co., Ltd. Assignor: Holland Royal PHILPS electronics Limited by Share Ltd Contract fulfillment period: From October 1, 2004 to October 3, 2007 Contract record no.: 051000030078 Denomination of invention: A recording carrier that can be read out of light Granted publication date: 19910306 License type: General permission Record date: 20050825 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: COMMON LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2004.10.1 TO 2007.10.3 Name of requester: JIANGSU YONGXIN MULTIMEDIA CO., LTD. Effective date: 20050825 |
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