Source: http://www.google.com/patents/US7301884?dq=5,579,517
Timestamp: 2016-09-30 15:41:23
Document Index: 73793433

Matched Legal Cases: ['Application No. 99', 'Application No. 2006', 'Application No. 2006', 'Application No. 2004111362', 'Application No. 2004', 'Application No. 2004', 'Application No. 2004', 'Application No. 07107732']

Patent US7301884 - Method of and apparatus for recording data on optical recording medium - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a mark shape such that a recording/reproducing...http://www.google.com/patents/US7301884?utm_source=gb-gplus-sharePatent US7301884 - Method of and apparatus for recording data on optical recording mediumAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7301884 B2Publication typeGrantApplication numberUS 10/806,107Publication dateNov 27, 2007Filing dateMar 23, 2004Priority dateSep 29, 2001Fee statusPaidAlso published asUS7274647, US7280460, US7295505, US7313078, US7336588, US7388824, US7525890, US8416665, US20030095488, US20040174789, US20040174790, US20040179452, US20040179453, US20040179459, US20040240362, US20060203676, US20090073834Publication number10806107, 806107, US 7301884 B2, US 7301884B2, US-B2-7301884, US7301884 B2, US7301884B2InventorsYong-jin Ahn, In-sik Park, Kyung-geun Lee, Chang-jin Yang, Tatsuhiro Otsuka, Du-seop Yoon, Seong-Sue KimOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (45), Non-Patent Citations (16), Referenced by (42), Classifications (19), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethod of and apparatus for recording data on optical recording medium
US 7301884 B2Abstract
A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a mark shape such that a recording/reproducing characteristic of the optical recording medium is improved.
1. An apparatus for recording data on an optical recording medium, comprising:
a recording waveform generating unit which generates a recording waveform having an erase pattern containing a leading pulse and a multi-pulse having a high power level and a low power level and a recording pattern containing recording pulses, a power level of the leading pulse of the erase pattern being the low power level of the multi-pulse and a power level of a period between an end point of the erase pattern and a start point of a leading pulse of the recording pattern being the high power level of the multi-pulse; and
a pickup unit which generates light to the optical recording medium according to the generated recording waveform so that a mark or a space is formed on the optical recording medium,
wherein the recording waveform generating unit generates a further multi-pulse of another recording pattern, and a cooling pulse having a cooling power level less than the low power level of the multi-pulse and connecting the leading pulse of the erase pattern and another portion of the further multi-pulse of the another recording pattern.
2. The apparatus of claim 1, further comprising: a channel modulation unit which channel modulates data provided from an outside source, and outputs an NRZI data signal to the recording waveform generating unit.
3. The apparatus of claim 1, wherein the pickup unit comprises:
a motor which rotates the optical recording medium;
an optical head having a laser device which generates a laser beam to the optical recording medium or receives the laser beam reflected from the optical recording medium;
a servo circuit which servo-controls the motor and the optical head; and
a laser driving circuit which drives the laser device installed in the optical head.
4. The apparatus of claim 1, wherein the recording waveform generating unit generates the recording waveform using the input data modulated according to a Run Length Limited (RLL)(1, 7) method.
the recording pattern further includes the further multi-pulse which includes the leading pulse of the recording pattern,
the further multi-pulse comprising corresponding high power recording pulses with a high recording power level and low power recording pulses having a low recording power level,
the high recording power level being greater than the high power level of the erase pattern, and
the low recording power level being less than the low power level of the erase pattern.
6. The apparatus of claim 1, wherein the cooling power is less than a power of a last pulse of the further multi-pulse of the another recording pattern and the low power level of the leading pulse of the erase pattern.
7. An apparatus for recording data on an information storage medium, comprising:
a recording waveform generating unit which generates a recording waveform comprising a recording pattern having recording pulses, an erase pattern preceding the recording pattern and having a leading pulse and a multi-pulse having a high power level and a low power level, another recording pattern preceding the erase pattern and having the recording pulses, and a cooling pulse concatenating the another recording pattern and the erase pattern, a power level of the leading pulse of the erase pattern being the low power level of the multi-pulse and a power level of a period of between an end point of the erase pattern and a start point of a leading pulse of the recording pattern being the high power level of the multi-pulse; and
a pickup unit which records with respect to the information storage medium according to the generated recording waveform so as to form a mark and/or a space on the information storage medium,
wherein the cooling pulse has a cooling power less than a power of a last pulse of the another recording pattern and the low power level of the leading pulse of the erase pattern.
8. The apparatus of claim 7, wherein the generating unit adjusts the period to be the high power level according to a pulse of the multi-pulse of the erase pattern.
the recording pattern is formed of a further multi-pulse including the leading pulse,
10. The apparatus of claim 7, wherein the cooling power is less than a recording power of the another recording pattern and the low power level of the leading pulse of the erase pattern.
11. An apparatus for recording data on an information storage medium, comprising, comprising:
a modulator which modulates input data according to according to a Run Length Limited (RLL)(1, 7);
a recording waveform generating unit which receives the modulated input data and generates a recording waveform which includes first pulses to form a recording pattern in response to a first level of the input data and a leading pulse and a multi-pulse having a high power level and a low power level to form an erase pattern in response to a second level of the input data, a power level of the leading pulse being the low power level of the multi-pulse and a power level of a period between an end point of the erase pattern and a start point of a leading pulse of the recording pattern being the high power level of the multi-pulse; and
a pickup forming a mark or a space by using the generated recording and erasing waveforms,
wherein the recording waveform generating unit generates in the recording waveform a cooling pulse concatenating the erase pattern and another recording pattern preceding the erase pattern and having a cooling power other than the low power level of the erase pattern.
the recording pattern is formed of a further multi-pulse including the leading pulse of the recording pattern,
13. The apparatus of claim 12, wherein the period starts when the second level changes to the first level.
14. An apparatus for recording data on an optical recording medium, comprising:
a recording waveform generating unit which generates a recording waveform having an erase pattern containing a leading pulse and a multi-pulse having a high power level and a low power level, a recording pattern following the erase pattern and containing another multi-pulse, another recording pattern preceding the erase pattern and having the another multi-pulse, and a cooling pulse having a cooling power level below the low power level and which concatenates the another recording pattern and the erase pattern, a power level of the leading pulse of the erase pattern being the low power level of the multi-pulse and a power level of a period between an end point of the erase pattern and a start point of a leading pulse of the recording pattern being the low power level of the multi-pulse; and
a pickup unit which generates light to the optical recording medium according to the generated recording waveform so that a mark or a space is formed on the optical recording medium.
This application is a continuation of prior U.S. application Ser. No. 10/256,244, filed Sep. 27, 2002. This application claims the benefit of Korean Patent Application Nos. 2001-61039, filed Sep. 29, 2001, and 2001-80541, filed Dec. 18, 2001, in the Korean Intellectual Property Office, and U.S. Provisional Application Nos. 60/327,305, filed Oct. 9, 2001, and 60/373,377, filed Apr. 18, 2002, the disclosures of which are incorporated herein by reference.
The present invention relates to a method of and apparatus for recording data on an optical recording medium, and more particularly, to a method and apparatus in which digital data is recorded on an optical disc by forming a mark on the optical disc.
Data are recorded on an optical disc which is one type of optical recording media, in a form of a mark on a track formed on the optical disc. A mark is formed as a pit in a read-only disc, such as a Compact Disc-Read Only Memory (CD-ROM) and a Digital Versatile Disc-Read Only Memory (DVD-ROM). In a recordable disc, such as a CD-R/RW and a DVD-R/RW/RAM, a phase-change film which is changed into a crystalline phase or an amorphous phase is formed on a recording layer, and a mark is formed by a phase change of the phase-change film.
Methods of recording data can be divided into a mark edge recording method and a mark position recording method. According to the mark position recording method, a signal of an amplitude of a detected Radio Frequency (RF) signal is changed from negative to positive or from positive to negative at a location on which a mark is recorded. According to the mark edge recording method, the signal of the amplitude of the detected RF signal is changed from negative to positive or from positive to negative at both edges of the mark. Therefore, recording the edges of the mark is an important factor in improving quality of a signal reproduced from the
However, in a disc on which the phase-change film is coated, it is shown that a shape of a trailing edge of the mark recorded according to a prior art recording method changes according to a length of the mark or an interval between the marks, i.e., a space. That is, the trailing edge of the mark is formed greater than a leading edge of the mark such that recording/reproducing characteristics of the disc are degraded. If a recording mark is relatively long, the recording/reproducing characteristics are more degraded.
FIGS. 1A-1E are reference diagrams of recording waveforms (a), (b), and (c) to record a Non Return to Zero Inverted (NRZI) data signal according to the prior art. The recording waveform (a) is used for recording the NRZI data signal on a DVD-RAM, the recording waveforms (b) and (c) are for a DVD-RW. Here, T denotes a cycle of a reference clock. According to the mark edge recording method, a high level of NRZI data is recorded as a mark and a low level of NRZI data is formed as a space. A portion of the recording waveform used in recording the mark is referred to as a recording pattern, and another portion of the recording waveform used in forming the space (in erasing the mark) is referred to as an erase pattern. The prior art recording waveforms (a), (b) and (c) use a multi-pulse as the recording pattern, and a power of the erase pattern is maintained constant in a predetermined DC level for an interval E as shown in FIG. 1E.
Since the DC level of the erase pattern included in the prior art recording waveform is maintained constant for a predetermined period of time, 0˜200� C. heat is continuously applied to a corresponding area to form the space. Therefore, if recording is repeatedly performed, a shape of the mark is degraded and distorted such that the recording/reproducing characteristics of the optical disc are degraded. In particular, a development toward a high density and a high line speed for recording more data on the optical disc makes the clock cycle T shorter, and therefore a heat interference between pulses forming the recording waveform increases to cause more degradation of the recording/reproducing characteristics of the optical disc.
Meanwhile, in the prior art, the different recording waveforms are used according to the kinds of the optical discs and specifications, such as DVD-RAM and DVD-RW, because characteristics of recording films of the optical discs are different. In particular, due to the fact that the different recording waveforms should be used for each kind of the optical discs, a problem occurs in manufacturing a multi-drive which can record/reproduce all specifications of the optical discs because the multi-drive should accommodate a variety of the different recording waveforms. The problem causes an increase in cost.
To solve the above and/or other problems, it is an object of the present invention to provide a recording method and apparatus in which distortion of shapes of a leading edge and a trailing edge of a mark and degradation of the mark caused by repeated recording operations can be prevented.
It is another object of the present invention to provide a recording method and apparatus in which data is recorded by a recording waveform having an erase pattern which can improve a shape of a mark or a space.
It is yet another object of the present invention to provide a recording method and apparatus in which data is recorded by a recording waveform which can be applied to a disc having a recording film with a variety of characteristics.
To accomplish the above and/or other objects of the present invention, there is provided a method of recording data on an optical recording medium. The method includes forming a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse.
According to an aspect of the present invention, data is recorded according to a Run Length Limited (RLL) (2, 10) process in which 2 and 10 are a minimum length and a maximum length of the mark or space, respectively, a first level of a predetermined Non Return to Zero Inverted (NRZI) data signal is recorded as the mark, and a second level of the predetermined NRZI data signal is recorded as the space.
Also, to accomplish the above and/or other objects of the present invention, there is provided a method of recording data on the optical recording medium. The method includes generating a channel modulated digital data (NRZI data) signal, generating the recording waveform having the erase pattern containing the multi-pulse and the recording pattern, and forming the first level of the charnel modulate digital data signal as the mark and forming the second level of the channel modulate digital data signal as the space by using the generated recording waveform.
According to an aspect of the present invention, the method is based on the Run Length Limited (RLL) (2, 10) or RLL (1, 7) process in which 1 and 7 are the minimum length and the maximum length of the mark or space.
According to another aspect of the present invention, a power level of a leading pulse of the erase pattern is a low level of the multi-pulse and another power level of a trailing pulse is a high level of the multi-pulse. Alternatively, the power level of the leading pulse of the erase pattern may be the high level of the multi-pulse, and the power level of the trailing pulse may be the high level of the multi-pulse. The power level of the leading pulse of the erase pattern may be the low level of the multi-pulse and the power level of the trailing pulse may be the low level of the multi-pulse. The power level of the leading pulse of the erase pattern may be the high level of the multi-pulse and the power level of the trailing pulse may be the low level of the multi-pulse.
According to another aspect of the present invention, a ratio of a duration time of the high level and another duration time of the low level of the multi-pulse is substantially 1:1, and the duration time of the high level is half a clock cycle.
It is possible that in the generating of the channel modulated digital data, the first level of the NRZI data signal is formed as the mark, and in the generating of the recording waveform, the second level of the NRZI data signal is formed as the space.
The recording waveform includes a cooling pulse, and the erase pattern includes a part of the cooling pulse. It is possible that if an ending time of the cooling pulse is less than or greater than 0.5Ts from the trailing edge of the NRZI data, the duration time of the leading pulse forming the erase pattern increases over 0.5Ts when T is a cycle of a reference clock signal.
According to another aspect of the present invention, a unit pulse constituting or included in the multi-pulse has a high level and a low level that are adjusted by the duration time of the leading pulse of the recording pattern.
According to another aspect of the present invention, the recording pattern has at least two power levels.
Also, to accomplish the above and/or other objects of the present invention, there is provided an apparatus for recording data on the optical recording medium. The apparatus includes a recording waveform generating unit which generates the recording waveform having the erase pattern containing the multi-pulse and the recording pattern, and a pickup unit which applies light to the optical recording medium according to the generated recording waveform so that the mark or the space is formed.
According to another aspect of the present invention, the apparatus also includes a channel modulation unit which channel-modulates input data received from an outside source and outputs the generated NRZI data signal to the recording waveform generating unit.
According to another aspect of the present invention, the pickup unit includes a motor which rotates the optical recording medium, an optical head which applies a laser beam to the optical recording medium or receives the laser beam reflected from the optical recording medium, a servo circuit which servo-controls the motor and the optical head, and a laser driving circuit which drives a laser device installed in the optical head to generate the laser beam.
The above objects and/or advantages of the present invention will become more apparent and more readily appreciated from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings of which:
FIGS. 1A-1E are reference diagrams of recording waveforms according to the prior art;
FIG. 2 is a block diagram of a recording apparatus according to an embodiment of the present invention;
FIG. 3 shows an example of an implementation of the recording apparatus of FIG. 2;
FIGS. 4A-4C show an example of a waveform generated by a recording waveform generating circuit of the recording apparatus of FIG. 3;
FIGS. 5A-5C show another example of a waveform generated by the recording waveform generating circuit of the recording apparatus of FIG. 3;
FIGS. 6A through 6E are waveforms explaining four types of erase patterns according to another embodiment of the present invention;
FIGS. 7A and 7D are other examples of the erase pattern of FIG. 6B;
FIGS. 8A through 10C are shapes of marks recorded in a simulation;
FIGS. 11A through 15 are graphs showing characteristics of a DVD-RAM;
FIGS. 16A through 20 are graphs showing characteristics of a DVD-RW; and
FIG. 21 is a flowchart showing a recording method according to another embodiment of the present invention.
FIG. 2 is a block diagram of a recording apparatus according to an embodiment of the present invention. Referring to FIG. 2, the recording apparatus which forms a mark or a space on an optical recording medium (optical disc) 200, has a pickup unit 1, a recording waveform generating circuit 2, and a channel modulator 3.
The channel modulator 3 modulates input data which is input from an outside source into a channel bit stream, such as a Non Return to Zero Inverted (NRZI) data signal. The recording waveform generating circuit 2 receives the channel bit stream and generates a recording waveform to record the received channel bit stream. The recording waveform generated according to the embodiment of the present invention has an erase pattern having an erase multi-pulse. The recording waveform will be explained later in detail. The pickup unit 1 applies light (a laser beam) to the optical recording medium 200 according to the generated recording waveform so as to form the mark or the space.
FIG. 3 shows an example of an implementation of the recording apparatus of FIG. 2. The same blocks will be indicated by the same reference numerals, and the same explanation will be omitted. Referring to FIG. 3, the recording apparatus includes the pickup unit 1, the recording waveform generating circuit 2, and the channel modulator 3. The pickup unit 1 has a motor 11 rotating the optical disc 200, an optical head 13 receiving the light reflected from the optical disc 200, a servo circuit 12 controlling the motor and the optical head, and a laser driving circuit 14 driving a laser device (not shown) installed in the optical head 13 to generate the light.
The channel modulator 3 modulates the input data into the channel bit stream and outputs the NRZI data signal. The recording waveform generating circuit 2 generates the recording waveform to record the NRZI data signal and provides the recording waveform to the laser driving circuit 14. The laser driving circuit 14 forms the mark or the space by controlling the laser device in accordance with the received recording waveform.
FIGS. 4A-4C show an example of the recording waveforms generated by the recording waveform generating circuit 2. Referring to FIGS. 4A-4C, the NRZI data signal is changed from the input data according to a modulation method of the channel modulator 3. That is, if the modulation method is a Run Length Limited (RLL) (2, 10) series method. That is, according to an Eight to Fourteen Modulation (EFM) method, an Eight to Fourteen Modulation plus (EFM+) method, a D(8-15) method, and a Dual modulation method, a minimum length of the mark or the space is 3Ts and a maximum length of the mark or the space is 11Ts, where T is a cycle of a clock signal as shown in FIG. 4A, The D(8-15) method is a modulation method disclosed in “Optical Disc Recording System of 25 GB Capacity” announced by Matsushita in Optical Data Storage (ODS) 2001. The Dual modulation method is disclosed in Korean Patent Application No. 99-42032 titled “An RLL code allocation method, modulation and demodulation method, and demodulation apparatus having improved DC controlling capability,” filed by the present applicant on Sep. 30, 1999, and published on Nov. 25, 2000. If data is recorded using the RLL(1, 7) series method, the minimum length is 2Ts, and the maximum length is 8Ts.
When a high level of the NRZI data signal is formed as the mark and a low level of the NRZI data signal is formed as the space, the recording waveform includes a recording pattern to record a mark of a 7T length, an erase pattern to form a space of a 3T length, and another recording pattern to record a mark of a 3T length as shown in FIG. 4B.
The recording pattern includes a pulse train, e.g., a multi-pulse. Also, the erase pattern is formed with another pulse train, e.g., another multi-pulse (erase multi-pulse) having an interval F as shown in FIG. 4C. Tmp indicates a width of a pulse of the multi-pulse of the recording pattern. Here, the multi-pulse indicates at least one pulse having the same width and power. However, it is understood that the present invention is not limited thereto. That is, the width and the power of each pulse of the multi-pulse may vary. In the present embodiment, Tmp is 0.5Ts. Tlp indicates a width of a last pulse of the recording pattern. Tcl indicates a width (duration time) of a cooling pulse. The cooling pulse extends from the recording pattern to the erase pattern. Temp indicates a width of a pulse of the multi-pulse of the erase pattern. In the present embodiment, Temp is 0.5Ts. Tsfp indicates a period from a point where the NRZI data signal is transited from the low level to the high level at a point (start point of a first pulse) when the first pulse forming the recording pattern starts. Tsfp is under an influence of a power level of the erase pattern. That is, as shown in FIG. 4C, if Tsfp is greater than 0.5Ts and the multi-pulse contained in the erase pattern ends at low level Pb1 a next Tsfp starts from a high level Pb2 of the multi-pulse. Meanwhile, if Tsfp is less than 0.5Ts and the multi-pulse contained in the erase pattern ends at a low level Pb1 the next Tsfp maintains the low level Pb1 of the multi-pulse.
FIGS. 5A-5C show another example of waveforms generated by the recording waveform generating circuit 2. Referring to FIG. 5B, when the high level of the NRZI data signal is formed as the mark, and the low level is formed as the space, the recording waveform includes the recording pattern to record a mark of a 7T length, the erase pattern to form a space of a 5T length, and the recording pattern to record a mark of a 3T length.
The recording pattern includes the pulse train. Also, the erase pattern is formed with the pulse train, e.g., the multi-pulse (erase multi-pulse) having an interval G as shown in FIG. 5C. Tmp indicates the width of the multi-pulse forming the recording pattern. Here, the multi-pulse indicates at least one pulse having the same width and power. However, it is understood that the present invention is not limited thereto. That is, the width and the power of each pulse of the multi-pulse may vary. In the present embodiment, Tmp is 0.5Ts. Tlp indicates the width of the last pulse forming a recording pattern. Tcl indicates the width (duration time) of the cooling pulse. The cooling pulse extends from the recording pattern to the erase pattern. Temp indicates the width of the erase multi-pulse constituting the erase pattern. In the present embodiment, Temp is 0.5Ts. Tsfp indicates a period from a point where the NRZI data is transited from the low level to the high level at the point (start point of the first pulse) when the first pulse constituting the recording pattern starts. Tsfp is determined in response to the power level of the erase pattern. That is, as shown in FIG. 5C, if Tsfp is greater than 0.5Ts and the multi-pulse contained in the erase pattern ends at low level Pb1 the next Tsfp starts from the high level Pb2 of the multi-pulse. Meanwhile, if Tsfp is less than 0.5Ts and the multi-pulse contained in an erase pattern ends at the low level Pb1 the next Tsfp maintains the low level Pb1 of the multi-pulse.
FIGS. 6A through 6E are waveforms explaining four types of the erase patterns according to another embodiment of the present invention. Referring to FIGS. 6A through 6E, the erase patterns are divided into the four types: (a) LH, (b) HH, (c) HL, and (d) LL. Differences between the power levels of the erase patterns are marked with circles so that the differences can be easily understood as shown in FIGS. 6B through 6E.
First, the (a) LH indicates that a power of a leading pulse of the erase pattern is the same as the low level Pb1 of the following pulse of the erase multi-pulse, and when a last pulse of the erase multi-pulse of the erase pattern ends at the low level Pb1, the power level of the following Tsfp is the same as the high level Pb2 of the erase multi-pulse. The (b) HH indicates that the power of the leading pulse forming the erase pattern is the same as the high level Pb2 of the following pulse of the erase multi-pulse, and when the last pulse of the erase multi-pulse of the erase pattern ends at the high level Pb2, the level of the following Tsfp continues to be the same high level Pb2 of the erase multi-pulse. The (c) HL indicates that the power of the leading pulse forming the erase pattern is the same as the high level Pb2 of the following pulse of the erase multi-pulse, and when the last pulse of the erase multi-pulse of the erase pattern ends at the high level Pb2, the level of the following Tsfp is the same as the low level Pb1 of the erase multi-pulse. Finally, the (d) LL indicates that the power of the leading pulse forming the erase pattern is the same as the low level Pb1 of the following pulse of the erase multi-pulse, and when the last pulse of the erase multi-pulse of the erase pattern ends at the low level Pb1, the level of the following Tspf continues to be the same low level Pb1 of the erase multi-pulse.
FIGS. 7A and 7D are other examples LH2 and LH3 of LH of FIG. 6B. Referring to FIGS. 7A and 7D, the (e) LH2 is the same as (a) LH of FIG. 6B, except that Temp1, a duration time of the high level Pb2 of the multi-pulse forming a cycle, is 0.7Ts and Temp2, a duration time of the low level Pb1 of the multi-pulse, is 0.3Ts. Also, the (f) LH3 is the same as (a) LH of FIG. 6B, except that the duration time of the high level Pb2 or the low level Pb1 of the multi-pulse is 1.0T. Here, a ratio of Temp1 and Temp2, that is, the ratio of the duration time of the high level Pb2 and that of the low level Pb1 of the multi-pulse forming a cycle can be changed as m:n in a variety of ways. (Here, m and n are integers.) Thus, the recording waveform according to the present invention has the erase pattern containing the multi-pulse (erase multi-pulse) of which power is the high level Pb2 or the low level Pb1 and therefore distortion of the trailing edge of the mark is prevented and the reproducing characteristic of the optical disc is improved. In particular, in the recording waveforms shown in the embodiments described above, the duration time of the high level Pb2 and the low level Pb1 of the multi-pulse is adjusted within a range between 0.25Ts and 0.75Ts for a clock cycle T, and a duration time appropriate to heat characteristic of the optical disc 200 is selected. Therefore, the reproducing characteristic of the optical disc is more improved.
Meanwhile, information on the four types of the erase patterns (type information) may be recorded in a lead-in area of a recordable disc (optical disc) or may be included in a wobble signal as one of header information items. In this case, when data are recorded, the recording apparatus reads type information from the lead-in area or from the wobble signal to form the mark or the space by generating a corresponding recording waveform.
In addition, the four types of the erase patterns may be used as a symbol indicating multiple times speed of the disc or the kind of the mark when data is recorded and reproduced. For example, the erase pattern may indicate information of “the speed of a disc using LH type erase pattern is 20-multiple times speed.”
In order to test an effect of the present invention, shapes of the mark recorded in a simulation were observed. A structure used in the simulation is shown in table 1. The disc used in the simulation has a 4-layered film structure.
ZnS—SiO2 Sb—Te
ZnS—SiO2 Ag alloy
Each condition of the simulations includes a wavelength of 405 nm, a numeral aperture (NA) of 0.65, and a linear velocity of 6 m/s. In order to observe the shape of the mark, after a recording mark of 8T is recorded, a next recording mark of 8T is recorded by overlapping 4T of the previous recording mark of 8T. FIGS. 8A through 10C show comparison results between the mark shapes when the prior art recording waveform was used and the mark shapes when the recording waveform according to the present invention was used. FIG. 8A, shows a mark (a) formed by the simulation, FIG. 8B shows a mark (b) formed on the mark (a) by a recording waveform according to the present invention, and FIG. 8C shows a mark (c) formed on the mark (a) by the prior art recording waveform. Likewise, FIG. 9A shows a mark (d) formed by the simulation, FIG. 9B shows a mark (e) formed by the recording waveform having the erase pattern according to the present invention, and FIG. 9.C shows a mark (f) formed by the recording waveform having the prior art DC erase pattern. FIG. 10A shows a mark (g) formed by the simulation, FIG. 10B shows a result of erasing the mark (g) by the erase pattern according to the present invention, and FIG. 10C shows a result of erasing the mark (g) by the prior art DC erase pattern.
Table 2 shows parameters of thin films of the optical disc used in another simulation for interpreting heat.
λ = 405 nm
C(J/cm3K)
k(W/cmK)
ZnS—SiO2 2.300
Sb—Te eutectic
Referring again to simulation results of FIGS. 8A through 10C, it is shown that the trailing edge of the mark (b) formed by the recording waveform having the erase pattern according to the present invention as shown in FIG. 8B is better than the trailing edge of the mark (c) formed by the recording waveform having the prior art DC erase pattern of the prior art method as shown in FIG. 8C. Like the trailing edges, the shape of the leading edge of the mark is better when the erase pattern according to the present invention as shown in FIG. 9B. The results of the simulation show that the shape of the mark when the recording waveform having the erase pattern formed with the erase multi-pulse is used, is improved compared with the prior art. By adjusting the shape, width, and power level of the erase multi-pulse, distortion of the shape of the mark can be more reduced. art. By adjusting the shape, width, and power level of the erase multi-pulse, distortion of the shape of the mark can be more reduced.
In order to experimentally verify the effect of the present invention, parameters needed in obtaining the recording waveforms shown in FIGS. 4A through 5C, that is, the duration time and the power level, were obtained from a 4.7 GB DVD-RAM disc and a 4.7 GB DVD-RW disc using a DVD evaluator of which the laser wavelength is 650 nm and the NA is 0.60. Then, characteristics of repetitive recording/reproducing the NRZI data signal according to the present invention were compared with the prior art method.
FIGS. 11A through 15 are graphs showing the characteristics of the DVD-RAM. FIGS. 11A through 13B show features of power and time of recording the NRZI data signal using the recording waveform with the DC erase pattern of the prior art, and FIGS. 14A, 14B, and 15 show improved features of recording the NRZI data signal using the recording waveform of the present invention. FIGS. 11A and 11B show jitter characteristics with respect to recording power and erase power, respectively, for the leading edge, trailing edge, and both edges of the mark in the prior art DC erase. Based on the jitter characteristics, 14.5 mW recording power and 6 mW erase power were selected for experiments.
FIGS. 12A through 13B show the measured results in the prior art DC erase. Referring to FIGS. 12A-12G and FIGS. 13A and 13B, the most preferable jitter characteristics are shown when Tsfp=0.5Ts and when Tsfp=0.4Ts. Tcl didn't affect the jitter characteristics, and Tlp was good when the cycle is 0.7Ts.
Based on the parameters experimentally obtained in this way, the mark was formed with the recording waveform having the four types of erase patterns described above, and the characteristics of the formed mark were measured as the following.
FIGS. 14A and 14B show the jitter characteristics of the four types according to the present invention shown in FIG. 6. Referring to FIGS. 14A and 14B, it can be inferred that jitter characteristic is good when the NRZI data signal is recorded using the recording waveform with the erase pattern, i.e., any one of the four types of the erase pattern shown in FIGS. 6A-6E, of the present invention. Especially, referring to FIG. 14A, it is shown that the LH type is the best among the four types. Referring to FIG. 14B, when the erase pattern formed with the erase multi-pulse according to the present invention is used in erasing the mark, the jitter
FIG. 15 shows the jitter characteristics of the results of repetitive recording/reproducing using the recording waveform having the erase pattern according to the present invention compared with the prior art. Referring to FIG. 15, it is easily understood that when the mark is erased using the erase multi-pulse according to the present invention, the result is good, especially in the repetitive recording characteristics aspect.
FIGS. 16A through 20 are graphs showing characteristics of the DVD-RW. FIGS. 16A through 18B show features of power and time of recording the NRZI data signal using the recording waveform with the DC erase pattern of the prior art, and FIGS. 19A through 20 show improved features of recording the NRZI data signal using the recording waveform of the present invention.
FIGS. 16A and 16B show jitter characteristics with respect to recording power and erase power, respectively, for the leading edge, trailing edge, and both edges of the mark in the prior art DC erase. Based on FIGS. 16A and 16B, 14.0 mW recording power and 6 mW erase power were selected.
FIGS. 17A through 18B show the measured results in the prior art DC erase. Referring to FIGS. 17A through 18B, the most preferable jitter characteristics are shown when Tsfp=0.3Ts and when Tsfp=0.05Ts. Tcl was good in 0.55Ts, and Tlp was good in 1.0T and 1.1Ts.
Based on the parameters experimentally obtained in this way, the mark was formed with the recording waveform having the four types of erase patterns described above, and the reproducing characteristics of the formed mark were measured as the following.
FIGS. 19A and 19B show the jitter characteristics of the four types shown in FIGS. 6B through 6E. Referring to FIG. 19A, it is shown that the LH type is the best among the four types. When the erase pattern formed with the erase multi-pulse according to the present invention is used in erasing the mark, the jitter characteristics of Pb(Pb2−Pb1) which is the difference between the high level and the low level of the erase multi-pulse is shown. Since the characteristics are suddenly degraded from 3 mW, 1 mW was selected as a condition for the repetitive recording/reproducing experiment.
FIG. 20 shows the jitter characteristics of the results of repetitive recording/reproducing the NRZI data signal using the recording pulse having the erase pattern according to the present invention. Referring to FIG. 20, it is easily understood that when the mark is erased using the erase multi-pulse according to the present invention, the result is good, especially in the repetitive recording characteristics aspect. However, the jitter characteristics were suddenly degraded from 2,000 times. Therefore, it is shown that the pulse erase method according to the present invention is advantageous up to 1,000 times repetitive recording that is guaranteed in the normal DVD-RW.
Meanwhile, the above experiments followed the DVD formats and therefore the EFM+ modulation method was used. However, if any of other modulation methods that are normally used, for example, the RLL(1, 7) method, the D(8-15) method, and the Dual modulation method, is used, the result will be the same.
A recording method according to another embodiment of the present invention based on the structure described above will now be explained.
FIG. 21 is a flowchart showing the recording method. Referring to FIG. 21, the recording apparatus receives data from the outside source, modulates the data, and generates the NRZI data signal in operation 1801. Then, the recording apparatus generates the recording waveform having the erase pattern containing the erase multi-pulse in operation 1802. Using the generated recording waveform, the mark or the space is formed on the optical disc 200 in operation 1803.
As described above, according the present invention, the method of and apparatus for recording data using the recording waveform prevents distortion of the shape of the mark occurring due to heat interference and heat accumulation when data is recorded, and improves the shape of the mark so that the characteristics of recording/reproducing of the data are improved.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5007039Sep 22, 1988Apr 9, 1991Hitachi Maxell, Ltd.Optical information recording/reproducing apparatusUS5109373Jul 2, 1990Apr 28, 1992Matsushita Electric Industrial Co., Ltd.Optical information recording methodUS5132878Apr 25, 1989Jul 21, 1992Microelectronics And Computer Technology CorporationCustomizable circuitryUS5144601 *Feb 14, 1991Sep 1, 1992Fujitsu LimitedMagneto-optical overwriting methods using erasing pulses, each of which has a higher frequency and narrower width than that of the overwriting pulsesUS5150351 *Jun 7, 1991Sep 22, 1992Matsushita Electric Industrial Co., Ltd.Optical information recording apparatus for recording an input signal having variable width pulse duration and pulse spacing periodsUS5291470Feb 6, 1990Mar 1, 1994Matsushita Electric Industrial Co., Ltd.Optical information recording methodUS5353265Feb 7, 1990Oct 4, 1994Fujitsu LimitedMagneto optical overwriting methods using a single optical head designed for a two-beam overwriteUS5390156Oct 4, 1993Feb 14, 1995Fujitsu LimitedMagneto-optic overwrite disk recording system for erasing and overwriting in a single passUS5412626Mar 23, 1993May 2, 1995Matsushita Electric Industrial Co., Ltd.Method of recording optical information with selective correction in pulse waveform and a recording system thereforUS5490126 *Apr 4, 1994Feb 6, 1996Matsushita Electric Industrial Co., Ltd.Apparatus for recording and reproducing data on a diskUS5802031 *Nov 18, 1997Sep 1, 1998International Business Machines CorporationProgrammable PPM/PWM writing system for optical diskUS5825742 *Feb 11, 1997Oct 20, 1998Fujitsu LimitedInformation recording method of optical recording mediumUS5854775Oct 25, 1996Dec 29, 1998Fujitsu LimitedMagneto-optic disk recording system having improved duty ratio controllerUS6088315May 19, 1998Jul 11, 2000Sony CorporationDisc recording and/or reproducing apparatus and its motor drive control circuitUS6104685Dec 22, 1997Aug 15, 2000Hitachi, Ltd.Information recording apparatusUS6150964Aug 20, 1997Nov 21, 2000Calimetrics, Inc.M=10 (2,10), D=3.75 runlength limited code for multi-level dataUS6280810 *Oct 27, 1999Aug 28, 2001Ricoh Company, Ltd.Phase-change information recording medium and optical recording method to make higher rotation rates feasibleUS6281815Apr 21, 2000Aug 28, 2001Samsung Electronics Co., Ltd.Method of allocating RLL code having enhanced DC suppression capability, modulation method, demodulation method, and demodulation apparatus thereforUS6396792 *Oct 13, 1999May 28, 2002Kabushiki Kaisha ToshibaRecording method of a phase change optical recording medium and recording apparatusUS6600709May 7, 2001Jul 29, 2003Koninklijke Philips Electronics N.V.Method and device for recording an information signal on an information layer of a recording mediumUS6650607Oct 12, 1999Nov 18, 2003Hitachi, Ltd.Information recording method, information recording medium, and information recording apparatusUS20020001275Jan 30, 2001Jan 3, 2002Fujitsu LimitedInformation recording method and information recording apparatus thereforUS20020003762 *May 7, 2001Jan 10, 2002Dekker Martijn JeroenMethod and device for recording an information signal on an information layer of a recording mediumUS20020027848Feb 23, 2001Mar 7, 2002Sony CorporationRecording medium, recording apparatus, and reading apparatusUS20020067673Dec 19, 2001Jun 6, 2002Samsung Electronics Co., Ltd.Recording medium for storing write protection information and write protection method thereofUS20020101808Nov 29, 2001Aug 1, 2002Seo Jin-GyoAdaptive recording control method and apparatus for high density optical recordingUS20020176338 *Aug 16, 2001Nov 28, 2002Junko UshiyamaInformation recording method and optical disc apparatusCH1186297A Title not availableEP0309200A2Sep 20, 1988Mar 29, 1989Hitachi Maxell Ltd.Optical information recording/reproducing apparatusEP0335486A2Feb 14, 1989Oct 4, 1989Matsushita Electric Industrial Co., Ltd.Optical information recording methodEP1130583A1Mar 1, 2001Sep 5, 2001Ricoh Company, Ltd.Optical recording method and apparatus, and optical storage mediumJP2000123367A Title not availableJP2000222734A Title not availableJPH01165034A Title not availableJPH01253828A Title not availableJPH03165356A Title not availableJPH03185628A Title not availableJPH05182278A Title not availableJPH06124496A Title not availableJPH06131729A Title not availableJPH06203418A Title not availableJPH07240026A Title not availableJPH08124160A Title not availableJPH09115138A Title not availableWO2001086642A1Apr 19, 2001Nov 15, 2001Koninklijke Philips Electronics N.V.Method and device for recording an information signal on an information layer of a recording medium* Cited by examinerNon-Patent CitationsReference1Chinese Office Action issued Feb. 18, 2005.2Japanese Office Action issued May 17, 2005.3Office Action issued by Japanese Patent Office in Japanese Divisional Patent Application No. 2006-10535 on May 8, 2007.4Office Action issued by Japanese Patent Office in Japanese Patent Application No. 2006-010535 on Sep. 12, 2006.5Office Action issued by Russian Patent Office in Russian Patent Divisional Application No. 2004111362/09(012231) on Jun. 21, 2007.6Office Action issued in Japanese Patent Application No. 2004-171689 on Aug. 1, 2006.7Office Action issued in Japanese Patent Application No. 2004-171870 on Aug. 1, 2006.8Office Action issued in Japanese Patent Application No. 2004-171871 on Aug. 15, 2006.9Search Report issued by European Patent Office in European Patent Application No. 07107732.5-1232 on Jun. 25, 2007.10U.S. Appl. No. 10/256,244, filed Sep. 27, 2002, Yong-jin Ahn et al., Samsung Electronics Co., Ltd.11U.S. Appl. No. 10/806,106, filed Mar. 23, 2004, Yong-jin Ahn et al., Samsung Electronics Co., Ltd.12U.S. Appl. No. 10/806,215, filed Mar. 23, 2004, Yong-jin Ahn et al., Samsung Electronics Co., Ltd.13U.S. Appl. No. 10/806,318, filed Mar. 23, 2004, Yong-jin Ahn et al., Samsung Electronics Co., Ltd.14U.S. Appl. No. 10/806,319, filed Mar. 23, 2004, Yong-jin Ahn et al., Samsung Electronics Co., Ltd.15U.S. Appl. No. 10/806,320, filed Mar. 23, 2004, Yong-jin Ahn et al., Samsung Electronics Co., Ltd.16U.S. Appl. No. 11/430,169, filed May 9, 2006, Yong-jin Ahn et al., Samsung Electronics Co., Ltd.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7525890 *Sep 27, 2002Apr 28, 2009Samsung Electronics Co., Ltd.Method of and apparatus for recording data on optical recording mediumUS7995442 *Apr 5, 2010Aug 9, 2011Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8134899Apr 21, 2011Mar 13, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8139459Apr 21, 2011Mar 20, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8149672Apr 21, 2011Apr 3, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8149674Apr 20, 2011Apr 3, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8154970Apr 21, 2011Apr 10, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8154971Apr 25, 2011Apr 10, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8159920Apr 17, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8159921Apr 17, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8165000Apr 24, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8165001Apr 24, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8169872Apr 21, 2011May 1, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8169873May 1, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8169874Apr 25, 2011May 1, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8174948May 8, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8179764Apr 25, 2011May 15, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8179765Apr 26, 2011May 15, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8184517May 22, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8264931Apr 26, 2011Sep 11, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8339916Apr 26, 2011Dec 25, 2012Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8355306Jan 15, 2013Kabushiki Kaisha ToshibaOptical recording medium, information recording method, and information reproducing methodUS8416665Oct 30, 2008Apr 9, 2013Samsung Electronics Co., Ltd.Method of and apparatus for recording data on optical recording mediumUS20030095488 *Sep 27, 2002May 22, 2003Samsung Electronics Co., Ltd.Method of and apparatus for recording data on optical recording mediumUS20100188963 *Apr 5, 2010Jul 29, 2010Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110194383 *Aug 11, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110194384 *Aug 11, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110194385 *Aug 11, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110194387 *Aug 11, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110194388 *Aug 11, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110194389 *Aug 11, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110194392 *Aug 11, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110194394 *Aug 11, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110199870 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110199871 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110199872 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110199873 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110199874 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110199879 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110199881 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110202943 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing methodUS20110202944 *Aug 18, 2011Koji TakazawaOptical recording medium, information recording method, and information reproducing method* Cited by examinerClassifications U.S. Classification369/116, G9B/7.016, G9B/7.028, 369/59.11, G9B/7.01International ClassificationG11B7/125, G11B7/0045, G11B7/00, G11B7/006Cooperative ClassificationG11B7/00456, G11B7/0062, G11B7/0045, G11B7/126, G11B7/00454, G11B2007/0006European ClassificationG11B7/126, G11B7/006S, G11B7/0045, G11B7/0045SLegal EventsDateCodeEventDescriptionApr 19, 2011FPAYFee paymentYear of fee payment: 4May 19, 2015FPAYFee paymentYear of fee payment: 8RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services