KR100385877B1 - Optical medium and Information Recording/Reproducing Apparatus Using the same - Google Patents

Abstract

The present invention relates to an optical recording medium capable of minimizing crosstalk generated by adjacent tracks and wobbling signals incorporated into high frequency signals.

An optical recording medium according to the present invention has a phase in wobbling area in which both sides are wobbed in the same phase so that identification information including address information in a signal track is preformatted, and a phase in which both sides are different in phase from each other. It is provided with a two-phase wobbling area having an average track width that is wobbled by and is wider than the track width of the in-phase wobbling area.

According to the present invention, the average track width of the two-phase wobbling area is made larger than the track width of the in-phase wobbling area. Therefore, it is possible to minimize the wobbling signal included in the crosstalk and the high frequency signal generated in the narrow track width of the out of phase wobbling region.

Description

Optical recording medium and recording / reproducing apparatus using the same {Optical medium and Information Recording / Reproducing Apparatus Using the same}

The present invention relates to an optical recording medium and a recording / reproducing apparatus using the same, and in particular, it is possible to minimize crosstalk, cross erasure, and wobbling signals incorporated into high frequency signals generated by adjacent tracks. The present invention relates to an optical recording medium and a recording / reproducing apparatus using the same.

Recently, optical recording media and magneto-optical recording media have been developed and commercialized as recording media for recording various kinds of information such as video and audio information. Among them, optical recording media include CD-ROM (Read Only Memory) and DVD (Digital Versatile Disk) -ROM, including generalized CD (Compact Disc), CD-R (Recordable) and DVD-R. WORM (Write Once Read Memory) type discs, such as, and rewritable discs such as CD-RW (Rewritable) and DVD-RAM (Random Access Memory), are being spread or developed.

In a conventional recordable disc, identification (hereinafter, referred to as "ID") information including address (location) information or the like is recorded in advance so that information can be recorded at a desired position. The optical disc has a mountain signal track 10 and a valley signal track 12, as shown in FIG. 1, and the valley signal track 12 in accordance with a carrier signal frequency-modulated ID information including address information and the like. The address information can be read by the wobbling signal picked up from the signal track 12 of the wobbled goal, and the information can be recorded at a desired position on the disc based on this address information. However, in this type of disc, since the information is recorded only in the signal track 12 of the goal, the recording capacity of the information is limited.

Further, a disc (for example, a DVD-RAM) as shown in Fig. 2 is known as a disc on which information can be recorded on both mountain and valley signal tracks. This disc includes a recording field composed of signal tracks 10 and 12 of mountain and valley wobbled in phase with header fields in which ID information including address information and the like is recorded in the form of prepit columns 14. Doing. In this type of disc, since information cannot be recorded in the header field consisting of the prepit columns 14, the recording capacity is limited.

In order to solve the limitation of the recording capacity, in Korean Patent Application No. “98-32977” previously filed by the present applicant, in-phase wobbling of a predetermined section on each of the mountain and valley signal tracks 20 and 22 as shown in FIG. It has been proposed a frame wobbled recording medium in which the area 24A and the two-phase wobbling area 24B are formed alternately.

Referring to FIG. 3, each of the signal tracks 20 and 22 of the peak and valley has two-phase wobbling that is wobbled in a phase different from that of the in-phase wobbling area 24A in which both sides are wobbling in phase in predetermined intervals. The regions 24B are formed in an alternating form, and these in-phase wobbling regions 24A and the two-phase wobbling regions 24B are alternated in the width direction of the signal tracks 20, 22. The in-phase wobbling area 24A indicated by hatching is an area in which ID information including address information and the like is preformatted on both sides, and both sides are wobbled in accordance with a carrier signal on which ID information is frequency-modulated. Since the in-phase wobbling regions 24A are alternately arranged with the two-phase wobbling regions 24B in the advancing and width directions of the signal tracks 20 and 22, both sides of the two-phase wobbling regions 24B Wobbled to a different phase. As a result, address information is obtained from the wobbling signal on the in-phase wobbled region 24A. For example, when the in-phase wobbling area 24A and the out-of-phase wobbling area 24B are used as one information recording unit (i.e., a frame) as shown in FIG. 3, the front of the in-phase wobbling area 24B is shown. Alternatively, address information can be read from the in-phase wobbling area 24A located later, and user information can be recorded in the information recording unit based on the read address information.

In this frame wobbling method, since the in-phase wobbled region 24A is formed in in-phase, as shown in FIG. 4, it is formed with a constant track width T in all regions. However, since the out-of-phase wobbling region 24B is formed out of phase, the out-of-phase wobbling region 24B is formed with a track width obtained by subtracting the wobbling amplitude P from the track width T of the in-phase wobbling region 24A. In other words, in a predetermined region, the two-phase wobbling region 24B has a track width (T + P) obtained by adding the track width (T) and the wobbling amplitude (P), while in the other region, the war width (T) is warped at the track width (T). The track width TP is obtained by subtracting the bling amplitude P. FIG. That is, the biphasic wobbling region 24B is formed with a track width of T + P to a track width of T-P.

When the information is recorded in such an out-of-phase wobbling area 24B, when a narrow track width (for example, a track width of T-P) is reproduced, a crosstalk phenomenon occurs in which unwanted signals are reproduced in adjacent tracks. In addition, when reproducing a high frequency signal (i.e., data) (Radio Frequency: RF), the wobbling signal is mixed with the high frequency signal RF in a region formed with a narrow track width among the two-phase wobbling regions 24B, and thus the high frequency signal RF ) Will degrade the quality.

5A and 5B, the high frequency reproduction signal 30 in the region where the signal is not recorded and the wobble signal 32 obtained by the push-pull method are shown. When the high frequency signal 30 and the wobbling signal 32 are enlarged in the in-phase wobbling region 24A, the high frequency signal 34 in the in-phase wobbling region 24A is constant without noise as shown in FIG. 5A. It can be seen. This can be seen by comparing the high frequency signal 34 with the enlarged portion 35 of the wobbling signal 32. However, when the high frequency signal 30 and the wobbling signal 32 are enlarged in the out of phase wobbling region 24B, the high frequency signal 38 in the out of phase wobbling region 24B as shown in FIG. It can be seen that the wobbling signal is mixed. This can be seen by comparing the high frequency signal 38 with the portion 37 in which the wobbling signal 32 is enlarged. The wobbling signal and crosstalk phenomenon mixed in the high frequency signal RF in the biphasic wobbling region 24B become more severe as the optical recording medium becomes higher in density, that is, the track width becomes narrower.

Accordingly, an object of the present invention is to provide an optical recording medium and a recording / reproducing apparatus using the same, which can minimize cross talk generated by adjacent tracks and minimize wobble signals mixed in high frequency signals.

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

2 is a diagram schematically showing a signal track structure of a DVD-RAM disc.

3 is a diagram schematically showing a signal track structure of an optical disc capable of recording information on signal tracks of mountains and valleys.

4 is a view showing in detail the track widths of the two-phase wobbling region and the in-phase wobbling region shown in FIG. 3; FIG.

5A and 5B are diagrams showing high frequency signals reproduced from the two-phase wobbling region and the in-phase wobbling region shown in FIG.

6 is a diagram schematically showing a signal track structure of an optical disk according to an embodiment of the present invention.

Fig. 7 is a diagram schematically showing an information recording / reproducing apparatus for accessing an optical disc.

<Description of Symbols for Main Parts of Drawings>

10,20,40: Mountain signal track 12,22,42: Goal signal track

14: prepit row 24A, 44A: in-phase wobbling area

24B, 44B: Out of phase wobbling area 30, 34, 38: High frequency signal

32: wobbling signal 41: optical disk

43: motor 45: optical pickup

46: signal detector 48: focusing servo

50: tracking servo 52: playback information processor

54: recording clock / identification code detector 56: recording information processor

58: optical controller 60: rotation control signal generator

62: motor driving unit 64: control unit

In order to achieve the above object, the optical recording medium of the present invention has an in-phase wobbling area in which both sides are wobbed in the same phase so that identification information including address information in a signal track is preformatted, and alternately with the in-phase wobbling area. It has a two-phase wobbling area which is located in both phases and wobbles in a different phase and has an average track width that is wider than the track width of the in-phase wobbling area. Recording / reproducing is performed using the identification information preformatted in the bling area.

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

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 6 to 7.

6, there is shown an optical disk according to an embodiment of the present invention in which signal tracks 40 and 42 of mountain and valley are formed. Each of these peak and valley signal tracks 40 and 42 has an in-phase wobbling region 44B in which both sides are wobbled in phase with a predetermined phase and a two-phase wobbling region 44B in which both sides are wobbled in phases different from each other. It is formed in an alternating form, and these in-phase wobbling regions 44A and the out-of-phase wobbling regions 44B are alternated in the width direction of the signal tracks 40 and 42. The track width of the in-phase wobbled area 44A is formed smaller than the average track width of the two-phase wobbled area 44B. The in-phase wobbling area 44A indicated by hatching is an area in which ID information including address information and the like is preformatted on both sides, and both sides are wobbed in accordance with a carrier signal on which ID information is frequency-modulated. Therefore, when the in-phase wobbling area 44A and the out-of-phase wobbling area 44B are used as one information recording unit (i.e., a frame), the in-phase wobbling area 44B in front or behind Address information is read from the wobbling area 44A, and user information can be recorded in the information recording unit based on the read address information. Therefore, information is recorded on both the mountain signal track 20 and the valley signal track 22 in the recording medium in this manner, and further, all the recordable areas are utilized.

In contrast with the prior art, in the optical recording medium according to the embodiment of the present invention, the track width of the biphasic wobbling area 44B is larger than the track width of the in-phase wobbling area 44A. If the track width of the in-phase wobbling region 44A is T-α, the average track width of the in-phase wobbling region 44B is formed to be T + α. That is, the maximum track width of the two-phase wobbling area 44B is T + α + P, and the minimum track width is T + α-P. Therefore, the minimum track width is wider than the conventional optical recording medium by a predetermined value α. Therefore, it is possible to minimize the crosstalk generated at the minimum track width of the out-of-phase wobbling region 44B and the wobbling signal incorporated into the high frequency signal RF. In this case, the minimum track width T + α-P of the out-of-phase wobbling region 44B must be narrower than the track width T-α of the in-phase wobbling region 44A in comparison with the prior art. Since the minimum track width in the region can be improved, the condition of T-α> T + α-P, i.e., α <P / 2, must be satisfied.

Fig. 7 schematically shows a conventional information recording / reproducing apparatus for accessing optical disks.

Referring to Fig. 7, a conventional information recording / reproducing apparatus includes an optical disk 41 rotated by a spindle motor 43, an optical pickup 45 for optically accessing the optical disk 41, and an optical pickup. A signal detector 46 connected to the photodetector PD of 45 and a recording clock / identification code detector 54 to which the wobbling signal W is supplied from the signal detector 46 are provided. The optical pickup 45 irradiates a light beam onto a signal track of a hill or a valley of the optical disc 41 to record the information, and converts the reflected light into an electrical signal to read the information recorded on the mountain or valley signal track. do. The signal detector 46 processes the signals input from the four-segment photodetector PD of the optical pickup 45, respectively, to generate a high frequency signal RF, a wobbling signal W, a focus error signal Fe, and a tracking error. The signal Te is detected. The recording clock / identification code detector 54 receives the wobbling signal W from the signal detector 46 and includes the recording clock CLK, an identification code ID including an address indicating the physical position of the frame, an optical disk, and the like. Rotational speed information indicating the rotational speed of 41 is detected.

A typical information recording / reproducing apparatus includes an optical controller 58 for driving the laser diode LD of the optical pickup 45, a reproduction information processor 52 connected to the signal detector 46, and a signal detector 46. ) And a focusing servo 48 and a tracking servo 50 connected between the actuator AC and the actuator AC. The reproduction information processor 52 detects a channel bit stream from the high frequency signal RF and decodes the channel bit stream to reproduce the information recorded on the mountain or valley signal tracks of the optical disc 41. 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 bit stream 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 bit stream from the recording information processor 56, thereby causing the recording channel bit stream to signal the valley or the acid on the optical disc 41. Record on the track. The tracking servo 50 drives the actuator Ac in the horizontal direction with respect to the recording surface of the optical disc 41 in accordance with the trekking error signal Te input from the signal detector 46, thereby causing the optical disc 41 by the objective lens OL. The light beam focused on the track causes the signal track center of the valley or the mountain to follow. The focusing servo 48 drives the actuator Ac in a direction perpendicular to the recording surface of the optical disc 41 according to the focus error signal Fe input from the signal detector 46, thereby causing the optical disc 41 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.

A conventional information recording / reproducing apparatus controls the recording / reproducing operation with the rotation control signal generator 60 and the motor driver 62 connected in series between the recording clock / identification code detector 54 and the spindle motor 43. It is provided with a control unit 64 for. 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 rotation speed of the spindle motor 43 according to the rotation speed error input from the rotation control signal generator 60 to maintain the rotation speed of the optical disc 41 constant. The controller 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 / playback mode, and records / playback 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 a result, as shown in Fig. 6, optical discs on which the mountain and valley signal tracks are wobbled are accessed by a conventional information recording / reproducing apparatus. Furthermore, optical disks on which the signal tracks of the mountain and valley are wobbled as shown in FIG. 6 are used interchangeably with existing optical disks.

As described above, according to the optical recording medium and the recording / reproducing apparatus using the same, the average track width of the biphasic wobbling area is larger than the track width of the in-phase wobbling area. Therefore, it is possible to minimize the wobbling signal included in the crosstalk and the high frequency signal generated in the narrow track width of the biphasic wobbling region.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical 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 (8)

In the optical recording medium having a signal track of mountain and valley, An in-phase wobbling region in which both sides are wobbled in the same phase so that identification information including address information in the signal track is preformatted; Optical recording, characterized in that it has a two-phase wobbling region, which is alternately located with the in-phase wobbling region and whose sides are wobbled in a different phase and has an average track width that is wider than the track width of the in-phase wobbling region. media. The method of claim 1, And the difference between the average track width of the two-phase wobbling region and the track width of the in-phase wobbling region is less than twice the amplitude of the wobbling pulse. The method of claim 1, And the information is recorded / reproduced by the identification information including the address information preformatted in the in-phase wobbling area. The method of claim 1, And the in-phase wobbling area and the two-phase wobbling area which are adjacent to each other form one information recording unit. The method of claim 1, And the in-phase wobbling area and the out-of-phase wobbling area are alternately arranged in the width direction of the track. A recording / reproducing apparatus comprising recording / reproducing means for performing recording / reproducing by using preformatted identification information in the in-phase wobbling area of the optical recording medium of claim 1. delete delete