MEANS OF STORING INFORMATION AND METHOD AND RECORDING DEVICE AND / OR REPRODUCTION OF DATA IN AND / OR FROM THE SAME
FIELD OF THE INVENTION The present invention relates to an optical information storage medium in which tracking polarity data corresponding to the shape of holes is recorded, and a method and apparatus for recording and / or reproducing data in and / or of the optical information storage medium. BACKGROUND OF THE INVENTION General optical discs, which are optical information storage media, are classified as compact discs (CD) or digital versatile discs (DVD) according to their information storage capacity. Optical discs can also be classified as mini discs (MD) with diameters of 65 mm or less. In addition, discs that have a recording capacity of 20GB or greater are under development. Optical discs can be further classified as read-only disc or rewritable discs. Examples of read-only discs are CD-ROM (read-only memory) and DVD-ROM. Examples of rewritable discs are CD ± R / RW, DVD + R / R, and DVD-RAM
Ref.166215
(random access memory) . CD-R and DVD-R can perform recording only once, CD-RW and DVD-RW can perform recording and / or playback about 1000 times, and DVD-RAM can perform recording and / or playback of several hundred thousand times In general, the data is recorded as recesses in single-play discs or read-only discs. Since the rewritable discs are coated with a changing phase material, the data is recorded therein according to a phase change. In an apparatus for recording and / or reproducing data on and / or from an optical disc, a pickup exactly follows a track on which the user data has been recorded and receives a laser beam reflected from the track, thereby reading the user data. A signal used when the sensor follows the track is referred to as a tracking signal. The tracking signal is obtained from a photodiode having a plurality of receiving portions, which receive a laser beam and add or subtract the obtained light signals received by the individual receiving portions. The tracking signal is formed in a curve in the form of letter S in which the left and right polarities are opposite each other around their center. The tracking signal has different polarities depending on the type of optical disc, that is, the
physical characteristics of a recording layer, for example, the physical form of a gap, the physical form of a track, and the like. For example, Figures 1A and IB show groove tracks G and tracks of flat parts L arranged in opposite ways. In Figure 1A, a tracking signal has a polarity that changes from (+) to (-). In Figure IB, the tracking signal has a polarity that changes from (-) to (+). As described above, the polarity of a tracking signal is classified as a polarity that changes from (-) to (+) or a polarity that changes from (+) to (-). A tracking signal is processed differently depending on the polarity of the tracking signal. Therefore, if the polarity of a tracking signal is strongly recognized, the data can not be reproduced properly. Accordingly, when an optical disc is loaded, a conventional recording and / or reproducing apparatus recognizes the polarity of a tracking signal through rehearsal and error and then follows a track on which the user data has been recorded, based in the information about the recognized polarity. In this way, the user data is read from the optical disk. BRIEF DESCRIPTION OF THE INVENTION Technical Problem Therefore, the conventional reproduction apparatus spends some time getting information about
of the polarity of a tracking signal before reading the user data. This prevents immediate reproduction of user data. The polarity of a tracking signal can be changed by the physical shape of a hole. The physical shape of a hole may be different depending on the type of disc. Nevertheless, in the related art, the extra information about the polarity of a tracking signal that depends on the physical shape of a hole is not recorded on a disc, so that the reliability of the recording and / or reproduction of data is degraded . In addition, the conventional reproduction apparatus uses some time obtaining information about the polarity of a tracking signal through error and error, delaying the recording and / or reproduction. Technical Solution The present invention provides an optical information storage medium in which information about a tracking polarity that depends on a gap shape has been recorded, particularly information about a reverse phase polarity, and a recording method and / or reproduction of data in and / or of the optical information storage medium. According to one aspect of the present invention, there is provided an information storage means having at least one information storage layer, in
where the data is recorded in the form of protruding or jagged recesses in the entire or partial area of the information storage medium, and information regarding the protruding or jagged recesses is recorded. According to one aspect of the present invention, the information with respect to the protruding or serrated recesses is push-pull polarity information. In accordance with one aspect of the present invention, the information regarding the protruding or serrated recesses is recorded on or in front of a frame synchronization. In accordance with one aspect of the present invention, the information storage means includes a rupture-cut area (BCA) and an entry area, one of which stores the information with respect to the gaps. protruding or jagged. In accordance with one aspect of the present invention, the protruding or serrated recesses may be oscillating recesses. In accordance with one aspect of the present invention, the data is decoded by performing an exclusive OR operation with respect to the push-pull polarity information and the reproduced data of the protruding or serrated recesses. According to another aspect of the present invention, there is provided a method of data recording and / or data reproduction of an information storage medium having at least one storage layer of
information, the method includes recording data in the form of protruding or serrated recesses in the entire or partial area of the information storage medium and recording the information with respect to the protruding or serrated recesses. This method additionally includes reproducing the reverse phase polarity information and recording data in or reproducing data from the information storage medium by tracking the base of the reproduced reverse phase polarity information. Additional aspects and / or advantages of the invention will be described in part in the description which follows and, in part, will be obvious from the description, or may be learned by the practice of the invention. Advantageous Effects In an information storage medium according to the present invention, the tracking polarity information (i.e., push-pull polarity information) with respect to the protruding recesses and notched recesses is recorded so that the data can be Record or reproduce reliably without trial and error to obtain tracking polarity information. In addition, if the data is recorded in the form of gaps, each of the gaps may have various shapes, serrated or protruding gaps, similar.
BRIEF DESCRIPTION OF THE FIGURES The foregoing and / or other features and advantages of the present invention will become more apparent from the detailed description of the exemplary embodiments thereof with reference to the accompanying figures in which: Figures 1A and IB show different tracking properties that depend on a configuration of slot tracks and flat parts tracks; Figure 2A shows protruding recesses formed in a substrate of an information storage medium according to an embodiment of the present invention; Figure 2B shows toothed gaps formed in the substrate of the information storage medium according to an embodiment of the present invention; Figure 3A is a graph showing the amplitudes of a differential phase detection signal (DPD) and a radio frequency (RF) signal against time in an information storage medium in which data is formed as salient voids; Figure 3B is a graph showing the amplitudes of a DPD signal and an RF signal against time in an information storage medium in which the data is formed as toothed recesses; Figure 4A is a graph showing a counter-phase signal against time in a storage medium of
information in which the data is formed as outgoing holes; Figure 4B is a graph showing a counterphase signal against time in an information storage medium in which the data is formed as toothed recesses Figure 5 shows an example in which the tracked polarity data is recorded in a synchronization configuration in an information storage medium according to an embodiment of the present invention; Figures 6A and 6B show different examples of the location of the information storage medium according to an embodiment of the present invention where the tracking polarity information has been recorded in a specific configuration; Figures 7A and 7B show different sketches of an information storage medium according to another embodiment of the present invention; Figure 8A schematically shows a structure of an information area of a rewritable information storage medium; Figure 8B schematically shows a structure of an information area of a playback-only information storage medium; Figure 9A shows a straight arrangement of holes, and
Figure 9B shows an oscillating array of gaps; - Figure 10 shows an example in which the tracking polarity information has been recorded in an information storage medium according to another embodiment of the present invention; Figures 11A and 11B are views illustrating a decoding method based on an OR operation (XOR) exclusive of tracking polarity data and data that is detected from a data frame in the information storage medium according to another mode of the present invention; Figure 12 is a flow chart illustrating a method of recording and / or reproducing data according to another embodiment of the present invention; and Figure 13 illustrates schematically an apparatus for recording data in and / or reproducing data from an information storage medium according to the present invention. DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying figures, in which like reference numbers refer to similar elements throughout. The embodiments are described below to explain the present invention by reference to the
figures As shown in Figure 2A, in an optical information storage medium according to an embodiment of the present invention, the data is recorded as salient recesses 10 in a substrate 5. Alternatively, as shown in Figure 2B, the data are recorded as toothed recesses 13 in the substrate 5. Information about the recesses 10 or recesses 13 is recorded in the optical information storage medium. The information about the protruding or serrated recesses 10 or 13 can be tracking polarity information. When the data has been recorded in the form of protruding recesses 10, a tracing signal may have a polarity that changes from (+) to (-). When the data has been recorded in the shape of the serrated recesses 13, a tracing signal can have a polarity that changes from (-) to (+). As described above, because the polarity of a tracking signal varies depending on the shape of a gap, the tracking signal can be made differently depending on the shape of the gap so that the data can be recorded or reproduced usually. The conditions and results of a simulation performed to investigate the characteristics of a tracking signal are shown in Table 1.
Table 1
In Table 1, an RLL modulation technique is based on how many bits? 0 'exist between two bits? 1'. RLL (m, k) represents at least m bits? 0 'exist between two bits' 1 'and at most k bits? 0' exist between these. For example, RLL (1, 7) represents that at least one bit? 0 'exists between two bits 1' and at most 7 bits x 0 'exist between these. According to the modulation technique RLL (m, k), when m is 1, the data '1010101' is recorded, and a gap with a length 2T exists between two bits '1'. When m is 7, the data '10000000100000001' is recorded, and a gap with a length 8T exists between two bits? 1 '. At this point, T denotes the length of a minimum mark, that is, a minimum gap. Therefore, in the modulation method RLL (1, 7), the data is recorded in the form of gaps that vary in length from 2T to 8T and spaces. Figure 3A shows a radiofrequency (RF) signal and a differential phase detection (DPD) signal when the data has been recorded in the form of protruding recesses 10. Figure 3B shows an RF signal and a DPD signal when the data has been recorded in the form of
the toothed recesses 13. With reference to Figures 3A and 3B, the DPD signal does not depend on the shape of a recess. Figure 4A shows a push-pull signal when the data has been recorded in the shape of the protruding recesses 10, and Figure 4B shows a push-pull signal when the data has been recorded in the shape of the recesses 13. With reference to Figures 4A and 4B, the contrafase signal depends on the shape of a hole. Therefore, if the data is reproduced or tracked using the push-pull signal, information about a tracking polarity that depends on a gap shape needs to be recorded. Accordingly, the information about the tracking polarity may be information about the polarity of a push-pull signal. When recording information about a tracking polarity, as shown in Figure 5, an optical information storage medium according to one embodiment of the present invention includes a plurality of data frames 15, and information about a polarity of follow-up, that is, polarity information in push-pull. The reverse phase polarity information may be recorded in a synchronization configuration in a frame synchronization 14 included in front of an area that includes a predetermined number of data frames 15. The synchronization configuration may be a configuration not used as a configuration of user data or a bit configuration
specify An example of the synchronization configuration is shown in Figure 5. For example, the synchronization configuration can be formed from a repetition of identical data to represent the tracking polarity information. If the 1 'values are read consecutively, this means that the data is recorded in the form of outgoing holes. If the values (0 'are read consecutively, this means that the data is recorded in the form of jagged holes.) Alternatively, the tracking polarity information, i.e., reverse phase polarity information, may be recorded in a synchronization configuration. For example, as shown in Figure 6A, the data x010 'is recorded in the frame synchronization 14 and represents a polarity that changes from (+) to (-) In this case, if the data '101' are played after the tracking, the polarity of a tracking signal is processed in reverse so that the data can be reproduced appropriately In Figure 6A, the tracking polarity information has been recorded in the frame synchronization 14. However, as shown in FIG. 6B, the tracking polarity information may be recorded in a predetermined area 12 in advance of the frame synchronization 14. As described above. However, the tracking polarity information can be recorded in one part of the synchronization
of frame 14 or a different area of frame synchronization 14. Figures 7A and 7B show different sketches of an information storage medium according to another embodiment of the present invention. This information storage means includes a fixation area C, a break-away area (BCA) area B, an input area LI, a user data area U, and an output area LO. The fixing area C denotes an area which is pressed by a fixing apparatus to hold a disc. Tracking polarity information can be recorded in the BCA B area. The unique information about a disc, such as a serial number, a day / month / year of manufacture, and the like, can also be recorded in the BCA B area. In Figure 7A, the BCA B area is located between the fixing area C and the entrance area LI. However, as shown in Figure 7B, the BCA B area can be located ahead of the fixation area C. When the tracking polarity information is recorded in the BCA B area, it can be read before a disc is tracked after the disk is loaded into a disk drive and focused. Therefore, a tracking servo can be implemented efficiently. The tracking polarity information can also be recorded in the LI input area instead of the BCA area
B. Figure 8A shows a sketch of a rewritable information storage medium. The data can be recorded in the form of gaps in a part of the rewritable information storage medium, for example, in an entrance area or an exit area. The information about the shapes of the gaps, that is, tracking polarity information, can be recorded in the entry area, preferably in an area of information related to the disk. Figure 8B shows a sketch of a playback-only information storage medium. The tracking polarity information can be recorded in an area of information related to the disc included in an input area. The tracking polarity information includes push-pull polarity information. If the data is recorded in the form of gaps, the gaps can be arranged either in a straight line as shown in Fig. 9A or in an oscillating line as shown in Fig. 9B. When the data has been recorded in the form of a straight line of gaps, the data recorded in the gaps are reproduced using a sum channel, and the tracking can be controlled using DPD or the push-pull technique. If the follow-up is controlled using the push-pull technique, the information about a tracking polarity, that is,
Contraphase polarity information is required. When the data has been recorded in the form of an oscillating line of voids (later referred to as oscillating voids), the additional information can be recorded at the oscillations themselves. The data recorded in the oscillating recesses is reproduced using a sum channel, and the additional information recorded in the undulations can be reproduced using a push-pull channel. The oscillating recesses can be arranged in a single configuration, which is composed of recesses each having identical lengths and spaces. In the unique configuration of gaps, the gaps have no data, and instead of undulations they can have data. In this case, a push-pull channel can be used as a channel to reproduce data stored in the oscillating recesses. When the data is recorded in the form of oscillating recesses, it can be recorded using various modulation techniques. For example, the data may be recorded using at least one of a phase modulation technique, a frequency modulation technique, and an amplitude modulation technique. With reference to the figure. 10, in a storage medium according to another embodiment of the present invention, the tracking polarity information is recorded in a forward area, of a data frame
predetermined, and although the data is recorded in different ways, the data in different forms is decoded into identical data by performing an exclusive OR (XOR) operation with respect to the tracking polarity information and data read with the tracking polarity information. The tracking polarity information can be recorded in a frame synchronization. A method of decoding data using an XOR operation will now be described when the data has been recorded in the shapes of projecting recesses or toothed recesses. When the data recorded in the form of outgoing holes is tracked, the tracking polarity information is read as, for example, '0', and the data is read as, for example,? 11001 ... '. When the same data has been recorded in the form of jagged holes, the tracking polarity information is read as, for example, 11 ', and the data is read as, for example, ¾ 00110. Referring to Figure 11A, if the tracking polarity information with respect to the jagged holes is recorded as data? 0 ', and the detected data of a n-th data frame is' 11001 ...', the tracking polarity data and the data detected from the n-th data frame undergo an XOR operation to obtain the decoded data '11001. With reference to Figure 11B, if the information of
Follow-up polarity with respect to outgoing holes is recorded as data? , and the detected data of an n-th data frame is' 00110 ... ', the tracking polarity data and the detected data of the n-th data frame undergo an XOR operation to obtain the decoded data' 11001 . As described above, since the data is decoded using an XOR operation with respect to the tracking polarity data and the data reproduced from gaps, the data can be appropriately reproduced and restored regardless of whether the gaps are projecting gaps or jagged gaps . In addition, the decoded data can be obtained without extra change in a control operation. In addition, the data read using tracking polarity information, i.e., push-pull polarity information, as a selection signal can be either produced directly as decoded data or produced as decoded data after the polarity of the data is reversed . In other words, if the tracking polarity information is recorded in a predetermined configuration, and the tracking polarity information read is the same as the predetermined configuration, the data is directly decoded. However, if the tracking polarity information is recorded in a predetermined configuration, and the polarity information of
Tracking read is different from the default setting, the data is decoded after its polarity is reversed. The information storage medium according to the present invention is applicable to multi-layer information storage media with at least two information storage layers as well as single layer information storage means. Fig. 12 is a flow chart illustrating a method of recording and / or reproducing data according to an embodiment of the present invention. With reference to Figure 12, in operation 50, an information storage medium is loaded into a disk unit. In step 55, an optical pickup included in the disk unit reads the tracking polarity information, ie, push-pull polarity information, of the information storage medium loaded. The tracking polarity information is recorded as in the modes described above and is used as a basis on which a tracking signal is detected or the data is recorded and / or reproduced. Because a tracking polarity varies depending on the protruding recesses 10 of FIG. 2A or the recesses 13 of FIG. 2B, a tracking signal is processed differently according to the tracking polarity information. If the polarity information of
tracking is recorded in the BCA B area, an information storage medium is first loaded into a disk drive, and then the focus control is achieved, and the tracking polarity information is read from the BCA B area before that the data is read from the information storage medium loaded. Therefore, the reproduction of information and follow-up control are reliable. In operation 60, the disk unit records the data in or reproduces data from a data area by performing tracking control without trials and errors on the basis of the reproduced tracking polarity information, i.e., reverse phase polarity information. . In other words, the optical pickup provides the tracking polarity information reproduced to the disk unit, and the disk drive controls the optical pickup on the basis of the received information so that the data is smoothly recorded on or reproduced from the medium of storage. The data can be decoded by performing an XOR operation with respect to the tracking polarity data and the data reproduced from the gaps. Therefore, the data can be decoded without considering a tracking polarity. The data reproduced in the base of the tracking polarity information can be either directly produced as decoded data or produced as data
decoded after its polarity reverses. In other words, if the tracking polarity information is recorded in a predetermined configuration, and the tracking polarity information read is the same as the predetermined configuration, the data is directly decoded. On the other hand, if the tracking polarity information is recorded in a predetermined configuration, and the tracking polarity information read is different from the predetermined configuration, the data is decoded after its polarity is reversed. Fig. 13 illustrates schematically an apparatus for recording data in and / or reproducing data from an information storage medium according to the present invention. The apparatus includes a pickup 50, a recording / playback signal processor 60, and a controller 70. More specifically, the pickup 50 includes a laser diode 51 for radiating light, a collimating lens 52 for collimating the light emitted by the laser diode 51, a beam splitter 54 for changing an incident light path, and a lens lens 56 for focusing the light passing through the beam splitter 54 in an information storage means D. The light reflected by the medium of storage D is reflected by the beam splitter 54 and is received by a photodetector, for example, a 4 divisor photodetector 57. The incident light in the photodetector 4
divisions 57 is converted into an electrical signal as it passes through an operational circuit 58. An RF signal, i.e., a sum signal is produced via a first Chl channel and a differential signal is used in a push-pull technique via a second channel Ch2. When the information storage means D is loaded, the controller 70 controls the sensor 50 to project a beam onto the information storage means D and reads a signal in which a beam reflected by the information storage means D becomes by the signal processor 60. More specifically, the beam reflected by the information storage means D is applied to the photodetector 57 via the lens objective 56 and the beam splitter 54. The incident beam in the photodetector 57 becomes a electrical signal by the operational circuit 58, and the electrical signal is produced as an RF signal. The signal processor 60 processes a data signal according to the tracking polarity information read from the information storage means D. The controller 70 controls the capacitor 50 based on the data signal processed by the signal processor 60. states that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.