KR100813071B1 - Recording medium and recording and reproducing apparatus and recording and reproducing method - Google Patents

Abstract

The present invention relates to a hill / valley recording type optical disc in which the shift portion of a mountain track and a valley track is accurately detected.

In the mountain / gol recording type optical disc according to the present invention, track shift information for indicating the track shift position of the hill and the valley is recorded on a synchronization signal area corresponding to the track shift position of the hill and the valley.

Mountain / gol recording method, optical disc, track variation information

Description

Recording medium, recording and reproducing apparatus and recording and reproducing method {Recording medium, recording and / or playback apparatus and method}

1 is a diagram schematically showing a signal track structure of a CD-R.

2 is a view schematically showing an optical disc of a conventional mountain / gol recording method.

3 is a view showing track transition lines of hills and valleys in a conventional hill / valley recording optical disc.

Fig. 4 is a diagram showing a data frame of frame information preformatted on an optical disc according to the first embodiment of the present invention.

FIG. 5 is a diagram showing acid / goaltrack variation information preformatted in an optical disc according to a second embodiment of the present invention. FIG.

6A and 6B illustrate mountain / goaltrack variation information shown in FIG. 5 in detail.

7 is a block diagram showing an optical recording / reproducing apparatus according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10,20,32 Mountain track 12,22,34 Track goal

24A: in-phase wobbling zone 24B: two-phase wobbling zone

26A, 26B: Preformatted sync signal on mountain / goal track transition line

40: optical disk 42: spindle motor

44: optical pickup 46: signal detector

48: focusing servo 50: tracking servo

52: playback information processor 54: recording clock / identification code detector

56: record information processor 58: optical controller

60: rotation control signal generator 62: motor drive unit

64: control unit

The present invention relates to a hill / valley recording type optical disc in which the shift portion of a mountain track and a valley track is accurately detected. Further, the present invention relates to an optical disc recording / reproducing apparatus which can record / reproduce information by accurately identifying the displacement portion of a mountain track and a valley track using the mountain / gol recording optical disc.

Recently, optical discs have been developed in various forms to record as much information as possible as a recording medium for recording various information such as video and audio information. Such optical discs are roughly divided into read-only and recordable types.

In the recordable optical disc, identification information including physical address information indicating the recording position of the information is pre-formatted. Among the recordable optical discs, an optical disc such as a CD-R has a mountain signal track 10 and a valley signal track 12 as shown in FIG. The signal track 12 of the goal is wobbling in accordance with a carrier signal in which identification information including address information and the like is frequency-modulated. The address information is detected by the wobbling signal detected from the signal track 12 of the wobbled goal as described above, and the information is recorded on the track 12 of the goal based on this address information. However, in this type of optical disc, since the information is recorded only on the signal track 12 of the valley, the recording capacity is inevitably limited.

In order to increase the recording capacity, there is an optical disc for recording information on both the mountain and valley tracks, for example, a DVD-RAM. However, an optical disc such as a DVD-RAM has a limited recording density in the prepit form as much as an area occupied by a header field in which identification information on a mountain signal track or a valley signal track is recorded. The optical disc disclosed in Patent Application No. 98-32977 filed by the applicant of the present application records information on both the mountain signal track 20 and the valley signal track 22 as shown in FIG. The in-phase wobbling area 24A recorded in phase and the out-of-phase wobbling area 24B in which identification information is recorded in two phases are alternately arranged in the radial direction and the track direction. In this optical disc, one information recording unit includes an adjacent in-phase wobbling area 24A and a two-phase wobbling area 24B, and in-phase wobbling located in front of or behind the two-phase wobbling area 24B. Address information is detected from the area 24A, and user information is recorded in both the mountain and valley signal tracks 20 and 22 based on the detected address information.

Generally, in the recordable optical disc, the mountain, signal track 32, and valley signal tracks 34 are switched in one rotation period. The polarity of the tracking error signal, which is the reference signal of the tracking servo, should be reversed at the point where the mountain signal track 32 and the valley signal track 34 are transferred. In other words, control conditions such as inversion of the tracking error signal should be different according to the mountain signal track 32 or the valley signal track 34. To this end, there is a demand for a method capable of accurately determining a transition portion that is converted from the signal track 32 of the valley to the signal track 34 of the valley or the signal track 32 of the valley.

Accordingly, it is an object of the present invention to provide an acid / gol recording type optical disc capable of accurately discriminating the transition portions of a mountain track and a valley track.

Another object of the present invention is to provide an optical disc recording / reproducing apparatus capable of accurately recording / reproducing information by accurately determining displacement portions of a mountain track and a valley track using the mountain / gol recording optical disc.

In order to achieve the above objects, in the mountain / gol recording type optical disc according to the present invention, track shift information for indicating track shift positions of the hills and valleys is recorded on a synchronization signal area corresponding to the track shift positions of the hills and valleys. do.

An optical disc recording / reproducing apparatus according to the present invention includes an optical disc on which track shift information for indicating a track shift position of a hill and a valley is recorded on a synchronization signal area corresponding to the track shift position of a hill and a valley, and on the optical disc. Means for detecting recorded track shift information, and a tracking control section for inverting the polarity of a tracking error signal that causes the light beam focused on the optical disc to follow the center of the signal track and the valley of the valley according to the track shift information; Means for recording information on the tracks of the hills and valleys, and means for reproducing the information recorded on the tracks.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 4 to 7.

Referring to FIG. 4, identification information is recorded in an optical disc according to the present invention in frame data units including frame information (FI) of 1 byte, physical address (PID) of 3 bytes, and error detection code (EDC) of 2 bytes. do. A sync signal of 1 byte is recorded in each of the front and rear ends of the frame data.

The frame information FI indicates which of the signal tracks of the mountain or the signal track of the valley is preformatted. In the frame information FI, the most significant bit FIb ₇ is defined as a bit indicating whether the frame information FI is useful, and the next bit FIb ₆ indicates whether the current preformatted track is a mountain signal track or a goal track. Is defined as a bit. The remaining six bits (FIb _{5 to} FIb ₀ ) are defined as bits indicating the number of transition information between the signal signal of the hill and the signal track of the valley, for example, the number of frame data remaining up to the transition position of the signal track and the valley of the peak. For example, if the most significant bit FIb ₇ of the frame information FI is '1' and the next higher bit FIb ₆ is '1' (or '0'), the corresponding frame data is frame information, that is, track identification. It indicates that information and information on the remaining number of frame data up to the track transition position are included, indicating that the frame data is recorded on the mountain signal track (or the valley signal track). Also, the frame information FI may be used for recording information other than the frame information. For example, when the most significant bit FIb ₇ is written as '0', it is used for other purposes. Such frame information FI may be stored continuously in every frame data or intermittently in a predetermined number of frame data units.

The optical disc reproducing apparatus detects the frame information FI of the frame data and reads the logical value of the frame information FI to determine whether the currently accessed track is a mountain signal track or a goal signal track. The position of the transition between the signal track of the mountain and the signal track of the valley can be known.

In the frame data, the physical address (PID) indicates the positional information on the disk on which the user data is recorded. The error detection code EDC indicates whether an error of the frame information FI and the physical address PID is used for error correction. The error detection code (EDC) may be recorded as a cyclic redundancy check (CRC) code.

5 shows a synchronization signal for detecting a track transition position of a mountain / gol recording optical disc according to another embodiment of the present invention.

Referring to FIG. 5, the optical disk according to the present invention has an in-phase wobbling area 24A and an out-of-phase wobbling with a synchronization signal between each of the mountain signal tracks 20 and the valley signal tracks 20, 22. The frame data of the area 24B are alternately arranged, and the synchronization signals 26A and 26B indicating the hill / goal track transition positions are recorded. Information is recorded in the in-phase wobbled area 24A and the in-phase wobbled area 24B based on the physical address (PID) recorded in the wobble form on both sides of the in-phase wobbled area 24A. The synchronization signal is preformatted between the in-phase wobbling area 24A and the out-of-phase wobbling area 24B to distinguish these areas. In addition, the synchronization signals 26A and 26B preformatted on the hill / goal track transition lines indicate the shift position of the hill / goal track as data that is in violation of the Bi-Phase Modulation rule. In other words, in the signal tracks 20 and 22 of the mountain or valley, the pre-synchronization signal 26A or the post-synchronization signal 26B of the start and last in-phase wobbling region 24A is applied. Data that violates the dual phase modulation rule is selected to indicate the transition position of the mountain / goal track. For example, the pre-sync signal 26A or the post-sync signal 26B of the start and last in-phase wobbling area 24A in the mountain or valley signal tracks 20 and 22 are included. As shown in FIGS. 6A and 6B, a code in which the same bit value of '11111111' or '00000000' is in violation of the phase-in-phase modulation rule may be recorded.

7 shows an optical recording / reproducing apparatus according to an embodiment of the present invention.

Referring to FIG. 7, the optical recording / reproducing apparatus according to the present invention includes an optical disk 40 rotated by a spindle motor 42, an optical pickup 44 for optically accessing the optical disk 40, and an optical pickup. A signal detector 46 connected to the photodetector PD of 44, and a recording clock / identification code detector 54 to which the wobbling signal W is supplied from the signal detector 46. The optical pick-up 44 irradiates a light beam onto a signal track of a hill or a valley of the optical disc 40 to record information, and converts the reflected light into an electrical signal to convert the information recorded on the mountain or valley signal track. You will get poisoned. The signal detector 46 processes the signals input from the four-segment photodetector PD of the optical pickup 44 to detect the high frequency signal RF, the wobbling signal W, and the focus error signal Fe. do. The recording clock / identification code detector 54 stores the recording clock CLK from the wobbling signal W from the signal detector 46, an identification code ID including an address indicating the physical position of the frame, an optical disc 40, and the like. Rotational speed information indicating the rotational speed of the t) and mountain / gol track transition information (L / G) are detected. Here, the recording clock / identification code detector 54 pre-formats the frame information FI, which is recorded in 1 byte between the physical address PID and the synchronization signal Sync, on the optical disc 40 as shown in FIG. 4. The information is detected to generate mountain / goal track variation information (L / G). In addition, the recording clock / identification code detector 54 has a pre-synchronization signal (Pre Sync) 26A or a post-synchronization signal (Post Sync) of the start and last in-phase wobbling area 24A on the optical disk 40 as shown in FIG. If the hill / goal track transition information is preformatted in the 26B, the corresponding sync signals 26A and 26B are detected to generate the hill / goal track transition information L / G.

The optical recording / reproducing apparatus according to the present invention includes an optical controller 58 for driving the laser diode LD of the optical pickup 44, a reproduction information processor 52 connected to the signal detector 46, and a recording information processor. And the polarity inversion section 68, the polarity inversion section 68, and the optical pickup, which are commonly connected to the mountain / valley determination section 66, the mountain / valley determination section 66, and the signal detector 46; The tracking servo 50 connected between the actuators Ac of 44 and the focusing servo 48 connected between the signal detector 46 and the actuator Ac are provided. The reproduction information processor 52 detects the channel bit stream from the high frequency signal RF and decodes the channel bit stream to reproduce the information recorded on the signal track of the mountain or the valley of the optical disc 40. The recording information processor 56 blocks the recording information input from the input line into a frame size and adds an identification code ID input from the recording clock / identification code detector 54 to this recording frame. The recording channel bitstream generated from the recording information processor 56 is supplied to the optical controller 58 in accordance with the recording clock CLK. The optical controller 58 interrupts the light beam generated by the laser diode LD according to the logic value of the recording channel bitstream from the recording information processor 56, thereby causing the recording channel bitstream to signal the valley or acid on the optical disc 40. Record on the track. The mountain / goal determination unit 66 controls the polarity inversion unit 68 according to the mountain / goal track transition information L / G input from the recording clock / identification code detector 54. The polarity inversion unit 68 is generated whenever the mountain / goal track transition information L / G is generated by the control of the mountain / goal determination unit 66, that is, from the signal signal of the goal to the signal signal of the mountain or the signal of the mountain. The polarity of the tracking error signal Te input from the signal detector 46 is reversed every predetermined track period that changes from the track to the signal track of the goal. The tracking servo 50 drives the actuator Ac in the horizontal direction with respect to the recording surface of the optical disk 40 in accordance with the tracking error signal Te input from the polarity inversion unit 68, thereby causing the optical disk ( The light beam focused on 40 causes the signal track center of the valley or mountain to follow. The focusing servo 48 drives the actuator Ac in the direction perpendicular to the recording surface of the optical disc 40 in accordance with the focus error signal Fe input from the signal detector 46, thereby causing the optical disc 40 to be driven by the objective lens OL. The light beam focused on the lens is maintained within the focusing range within the depth of focus.

The rotation control signal generator 60 detects a rotational speed error from the rotational speed information from the recording clock / identification code detector 54 and controls the motor driver 62 according to the rotational speed error. The motor driver 62 controls the rotational speed of the spindle motor according to the rotational speed error input from the rotational control signal generator 60 to maintain the rotational speed of the optical disc 40 constant. The control unit 64 controls the operating states of the focusing servo 48 and the tracking servo 50, and selectively drives the recording information processor 56 and the reproduction information processor 52 according to the recording / reproducing mode and records / reproducing mode. As a result, the light controller 58 is controlled to adjust the intensity of the light beam generated by the laser diode LD.

As described above, the mountain / valley recording optical disc according to the present invention preformats the frame information indicating the track shift position in the predetermined data area between the physical address (PID) and the synchronization signal (Sync), or mounts or valleys. The information indicating the frame transition position is allocated to the synchronization signal disposed before or after the identification information preformatted at the track start position or the last position of the data as a violation of the dual phase modulation rule. Accordingly, according to the mountain / gol recording type optical disc according to the present invention, it is possible to accurately determine the transition portion of the track of the mountain and the track of the valley. The optical recording / reproducing apparatus according to the present invention detects information indicating a track transition position preformatted on the optical disc and controls servo drive such as a tracking servo based on the information. Therefore, in the optical recording / reproducing apparatus according to the present invention, in an optical disc in which information is recorded on both tracks of the hills and valleys, and the tracks of the hills and valleys alternate at predetermined track periods, the displacement portion of the tracks of the hills and the valleys is accurately determined. Information can be recorded and reproduced on mountain and valley tracks.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (19)

Including alternating mountain track and goal track, The mountain track and the goal track are each divided into a plurality of data units, and at least one of the data units includes preformatted identification information. The identification information includes address information indicating position information of a current data unit and variation information between a track of a mountain and a track of a valley indicating which track of the mountain track and a goal track is preformatted. Recording medium. The method of claim 1, wherein the identification information, And a preformatted wobbled form according to the frequency modulated carrier signal. delete The method of claim 1, wherein the address information, And position information of the track of the mountain or the track of the goal in which data is recorded. The method of claim 1, wherein the identification information, And an error detection code indicating whether there is an error in the shift information and the track information between the track of the mountain and the track of the valley. The method of claim 1, And the identification information is recorded in an identification information unit, and the identification information unit is plural. The method of claim 6, wherein the identification information of each identification information unit, And a bit indicating the usefulness of the information recorded in the identification information unit, wherein the bit indicating the usefulness is the most significant bit of the identification information. The method of claim 6, wherein the identification information of each identification information unit, And a bit indicative of the number of identification information remaining up to the transition position of the track of the mountain and the track of the valley. The method of claim 6, And a synchronization signal is further provided at the front and rear ends of the identification information unit. Optical pickup; A signal detector for receiving a signal from the optical pickup and processing the signal; An identification code detector for detecting identification information including address information and variation information between a mountain track and a valley track from a recording medium through the signal detector, and generating mountain / valley track variation information; And And a polarity inversion unit for inverting the polarity of the tracking error signal input from the signal detector in correspondence with the mountain / goal track transition information. delete The method of claim 10, wherein the variation information between the track of the mountain and the track of the goal, And a bit indicating whether the current track corresponds to one of the track of the mountain and the track of the goal. The method of claim 10, wherein the address information, And position information of the track of the mountain or the track of the valley in which data is recorded. The method of claim 10, wherein the identification information, And detecting in a preformatted portion in a wobbled form according to the frequency-modulated carrier signal. Identification information including shift information and address information between the track of the mountain and the track of the valley pre-formatted on the recording medium; A tracking error signal at a shift position between the track of the mountain and the track of the goal, with the type of track currently accessed by the shift information between the track of the hill and the track of the goal, and the shift between the track of the mountain and the track of the goal And reversing the polarity of the recording. delete The method of claim 15, wherein the variation information between the track of the mountain and the track of the goal, And a bit indicating whether the current track corresponds to one of the track of the mountain and the track of the goal. The method of claim 15, wherein the address information, And position information of the track of the mountain or the track of the valley in which data is recorded. The method of claim 15, wherein the identification information, And detecting in a preformatted portion in a wobbled form according to the frequency modulated carrier signal.

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