JPH0426959A - Synchronizing information recording and reproducing device - Google Patents

Abstract

PURPOSE:To surely detect synchronizing information even when a defect exists on a recording medium by providing plural pieces of a synchronizing pattern as the synchronizing information for data or address information and providing a pattern which is different from the synchronizing pattern between the two adjacent synchronizing patterns. CONSTITUTION:Each data part 15 is provided on the side of its end part with a preamble VFO SYNC 1, and two synchronizing patterns SYNC-A 2 and SYNC-B 3 for showing the lead of a recorded data DATA 4 are provided between this VFO SYNC 1 and the recorded data DATA 4. Moreover, a particular pattern 6 which is different from the SYNC-A 2 and the SYNC-B 3, having a length, for instance, a half size (length) of the SYNC-A 2 is provided between the synchronizing patterns SYNC-A 2 and the SYNC-B 3. By this method, even when a defect exists between the two adjacent synchronizing patterns, the synchronizing information can surely be detected.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for an optical information recording and reproducing device that optically records and/or reproduces information using a recording medium such as an optical card. The present invention relates to a synchronous information recording and reproducing device that records and reproduces synchronous information.

[Background Art] In recent years, with the development of the information industry, optical information recording and reproducing devices have attracted attention as large-capacity storage devices.

This optical information recording/reproducing device includes an optical card device that records and/or reproduces information using an optical card as a recording medium. The optical card has a storage capacity several thousand to ten thousand times that of a magnetic card, and cannot be rewritten like an optical disk, but because of its large storage capacity of 1 to 2 MB, it is often used as a bank deposit. A wide range of applications are being considered, such as bankbooks, portable maps, and prepaid cards used for shopping. Additionally, since it cannot be rewritten, it is also being considered for application in applications that do not allow tampering with data, such as personal health care cards.

Various types of such optical cards have been proposed in the past, and the present applicant also proposed an optical card 11 as shown in FIG. 13 in Japanese Patent Laid-Open No. 63-37876. This optical card 11 is provided with ID sections 14A and 14B on both ends of an optical recording section 13 having a plurality of tracks 12 parallel to each other, in which information indicating an address corresponding to each track is recorded so as to be read from opposite directions. , a data section 15 is defined between these ID sections 14A and 14B. Therefore, for example, the optical card 1
When the optical card 11 is moving in the track direction from left to right in the figure, the ID section 14A on the left side is read, and when the optical card 11 is moving in the trunk direction from right to left in the figure with respect to the optical head. recognizes the track address information corresponding to the track by reading the ID section 14B on the right side.

Note that the ID sections 14A and 14B are arranged at a constant distance from the card edge in order to prevent the effects of scratches, dirt, etc. on the card edge, and to sufficiently stabilize the relative movement speed of the optical card 11 and the optical head in the track direction. is provided within a distance M (for example, 4 mm).

Here, with reference to FIG. 12, the formatting of the data portion recorded on the track will be described. As shown in FIG. 12(a), each data section 15 includes a preamble VFO5YNC1 provided in order from the end side, and a synchronization pattern 5YNC indicating the beginning of recorded data.
-A 2 and recording data (hereinafter referred to as recording DATA) 4 which is recorded data.

When reproducing data, the output signal of the photodetector in the optical head is synchronized by VFO5YNC1 in the signal,
The demodulation circuit detects the synchronization pattern 5YN(, -A2) and outputs the 5YNC-A detection signal as shown in FIG. be done.

Further, Japanese Patent Application Laid-Open No. 169341/1983 discloses an example in which two synchronization patterns indicating the beginning of recorded data are prepared to increase the probability of data reproduction.

For example, as shown in FIG. 13, there is a defect 5 on the optical card 11, and the defect 5 is located exactly on the synchronization pattern 5YNC-A2 as shown in FIG. 14 (a>). Sometimes 5YN as shown in Figure 14(b)
Since the CA detection signal is not output, the recorded DATA4 cannot be reproduced.

Therefore, in the above-mentioned Japanese Patent Application Laid-open No. 58-169341, as shown in FIG. 15(a), 5YNC is used as a synchronization pattern.
-A 2 and 5YNC-B 3 are prepared, and usually the synchronization pattern 5 as shown in Fig. 15(b) and (c) is prepared.
If either YNC-A 2 or 5YNC-B 3 is detected, recorded DATA 4 can be reproduced. Therefore, for example, as shown in FIG. 16(a), the defect 5
Even if the 5YNC-A detection signal is located on the synchronization pattern 5YNC-A 2, as shown in FIG. 16(b), the 5YNC-A detection signal is not output, but as shown in FIG. The recorded DATA4 can be normally reproduced by the 5YNC-B detection signal.

[Problem H to be solved by the invention] Here, in the first case where only one synchronization pattern is prepared,
In the format shown in Figure 2(a), Figure 14(a)
), it goes without saying that the 5YNC-A detection signal is not detected when there is a defect 5 on the synchronous pattern 5YNC-A 2, but in Japanese Patent Application Laid-Open No. 58-1999, where two synchronous patterns are prepared, Even in the format shown in Japanese Patent No. 169341, for example, as shown in FIG.
In the case where the defect 5 exists across both of the two synchronization patterns 5YNC-A2.5YNC-
B 3 is not detected, therefore, FIG. 17(b),
As shown in (c), 5YNC-A detection signal, 5YNC
- Two of the B detection signals will not be output, and recording D
ATA4 does not play properly.

However, since the probability of defect 5 existing at any position on optical card 11 is considered to be equal, the probability that defect 5 exists on synchronization pattern 5YNC-A2 as shown in FIG. 16 is also as shown in FIG. 17. Sync pattern 5YNC-
The probability that defect 5 exists between A 2 and 5YNCB 3 is also equal, and simply preparing two synchronization patterns cannot be said to be a sufficient measure against defects.

Note that the above problems apply not only to optical card devices but also to optical disk devices.

The present invention has been made in view of the above circumstances, and is used in an optical information recording and reproducing device that can reliably detect synchronous information even if there is a defect on a recording medium. is intended to provide.

[Means for Solving the Problems] The synchronous information recording and reproducing device of the present invention is used in an optical information recording and reproducing device that records and/or reproduces information by relatively moving a recording medium and an optical head. In the apparatus for recording and reproducing synchronization information, a plurality of synchronization patterns are provided as the synchronization information for data or address information, and a pattern different from the synchronization pattern is provided between two adjacent synchronization patterns.

[Operation] In the present invention, a plurality of synchronization patterns are provided as synchronization information for data or address information, and a pattern different from the synchronization pattern is provided between two adjacent synchronization patterns. Therefore, even when a defect exists between two adjacent synchronization patterns, there is a high possibility that at least one of the synchronization patterns will be detected.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

Figures 1 to 11 relate to one embodiment of the present invention;
The figure is an explanatory diagram showing the format of the data section and the synchronization pattern detection signal, FIG. 2 is an explanatory diagram showing the synchronization pattern detection signal when there is a defect on one of the synchronization patterns, and the third
The figure is an explanatory diagram showing a synchronization pattern detection signal when there is a defect on the special pattern, Figure 4 is an explanatory diagram showing a format with a resynchronization pattern between recorded data, and Figure 5 is the resynchronization of Figure 4. FIG. 6 is an explanatory diagram showing the configuration of the pattern, FIG. 6 is an explanatory diagram showing the format of the ID section, FIG. 7 is an explanatory diagram showing the configuration of the optical card, and FIG. 8 is an explanatory diagram showing the configuration of the optical information recording/reproducing device. Figure 9 is an explanatory diagram showing the guide track and laser beam, Figure 10 is an explanatory diagram showing the photodetector, and Figure 11 is the main beam incident light 1 on the optical card.
FIG. 3 is an explanatory diagram showing the relationship between reflected light and a photodetector.

As shown in FIG. 7, the optical card 11 in this embodiment has an optical recording section 1 having a plurality of tracks 12 parallel to each other.
ID that records information indicating the address corresponding to each track so that it can be read from opposite directions at both ends of 3.
ID sections 14A and 14B are provided, and these ID sections 14A and 14B are provided.
The space between them is a data section 15. Therefore, for example,
When the optical card 11 is moving in the track direction with respect to the optical head from left to right in the figure, the ID section 14A on the left side is read, and the optical card 11 is moving in the track direction with respect to the optical head from right to left in the figure. When moving, ID section 1 on the right side
By reading 4B, track address information corresponding to the track is recognized. In addition, ID sections 14A and 14B
is placed a certain distance (for example, 4 mm) inside from the card edge in order to prevent the effects of scratches, dirt, etc. on the card edge, and to sufficiently stabilize the relative movement speed of the optical card 11 and the optical head in the track direction. established in

An optical information recording/reproducing apparatus using the optical card 11 is constructed as shown in FIG.

This optical information recording/reproducing device records/reproduces data by moving the optical card 11 in the track direction and moving the optical head 21 in a direction perpendicular to the track. It includes a recording/playback device. This device has a conveyor belt 23 that is passed between pulleys 22A and 22B, and a shuttle 24 is provided at a predetermined position on the conveyor belt 23. One pulley 2
2A is adapted to be rotated by a motor 26 driven by a motor servo circuit 25. A rotary encoder 27 is attached to this motor 26. The optical card 11 is loaded onto the shuttle 24 and transported back and forth in the track direction by driving a motor 26 by a motor servo circuit 25. Further, the position of the shuttle 24 with respect to the optical head 21 is detected by the rotary encoder 27. One pulse of the rotary encoder 27 corresponds to a position of 50 μm of the shuttle 24 with respect to the optical head 21, for example. The position information from the rotary encoder 27 is input to the motor servo circuit 25, and the optical card 1
A command signal is sent from the controller 28 to the motor servo circuit 25 so that the transport speed is constant between the ID sections 14A and 14B.

The optical head 21 is disposed at a position facing the shuttle 24 and is moved in a direction perpendicular to the tracks of the optical card 11 by driving a motor 18 whose drive is controlled by an optical head drive circuit 17. There is. The motor 18 includes an optical card 11 as well as the motor 26.
rotary encoder 19 for detecting the position relative to
is installed. One pulse of the rotary encoder 19 corresponds to, for example, a position of 50 μm in a direction perpendicular to the track of the optical head 21 with respect to the optical card 11.

The optical system of the optical head 21 is of the so-called "axis-based method" and is constructed as follows. That is, the optical head 21 has a laser diode 211 driven by a laser drive circuit 31. The light beam emitted from the laser diode 211 is collimated by a collimator lens 212, and then collimated into three beams by a diffraction grating 213. The beam is divided into beams and is made incident on a position offset from the central axis C of the objective lens 214.

The three beams converged by the objective lens 214 form three fine beams 90, 91, and 92 on the signal surface of the optical card 11, as shown in FIG. These three beams are arranged substantially along the longitudinal direction of the guide track 12A while slightly intersecting the guide track 12A, and have a main beam 90 with a main optical axis in the center, and sub beams 9 with sub optical axes on both sides of the main beam 90.
They are arranged in a line with an angle of 1°92 and converged on the surface of the optical card. The reflected beam from the optical card 11 passes through the objective lens 214 again, the direction of the beam is crossed by 90 degrees by a mirror 215 disposed at a position offset from the central axis C of the objective lens 214, and the beam direction is changed by an imaging lens 216. It is designed to be imaged onto a photodetector 217. Further, the objective lens 214 is supported by an actuator 218 so as to be movable in the optical axis direction and in the direction orthogonal to the track.

FIG. 10 shows an enlarged view of the photodetector 217. The photodetector 217 is a photodetector 217a, 21 for detecting a focus error signal, which is composed of two divided elements provided at the center.
7b, and photodetectors 217 for detecting tracking error signals provided on both sides of the photodetectors 217a and 217b.
c, 217d. Among the three reflected beams from the optical card 11, the main beam 90a, which is the reflected light of the central main beam 90, is irradiated onto the photodetectors 217a and 217b, and is reflected by the respective reflected lights of the sub-beams 91 and 92 on both sides. Certain sub-beams 91a and 92a are each detected by the photodetector 2.
17c and 217d are irradiated. Here, optical card 11
Main beam incident light 1 reflected light and photodetector 217
The relationship with is shown in FIG. That is, when the surface of the optical card 11 is in the focused state X, the difference between the outputs of the two photodetectors 217a and 217b is zero.

On the other hand, when the optical card 11 is displaced to a position Y closer to the optical head 21 than in the focused state, the output of the photodetector 217a becomes smaller than the output of the photodetector 217b, and conversely, the optical card 11 becomes smaller than the focused state. M, z far from the optical head 21
When the photodetector 217a is displaced to , a signal is obtained in which the output of the photodetector 217a is larger than the output of the photodetector 217b. Therefore, the direction and amount of displacement of the optical card 11 can be detected by calculating the difference between the outputs of the photodetectors 217a and 217b. When the distance between the optical card 11 and the objective lens 214 becomes shorter or longer, the main beam 90a becomes
It is displaced in the direction of arrow F on the photodetector 217 in FIG.

Here, the center position of the main beam 90a at the time of focusing is adjusted so that it is located on the boundary line between the photodetectors 217a and 217b, and by detecting the difference between the output values of the photodetectors 217a and 217b, A focus error signal can be obtained. On the other hand, the tracking error signal is determined by the output difference between the photodetectors 217C and 217d. By driving the objective lens 214 so that this output difference becomes zero, the main beam 90 always follows the information track.

As shown in FIG. 8, the output of the photodetector 217 is supplied to a demodulation circuit 9, and the demodulation circuit 29 obtains a read signal. Further, the photodetector 21
The output of 7 is also input to the focus track servo circuit 30, and a focus error signal and a tracking error signal are detected by the above-mentioned calculation, and these signals cause the focus track servo circuit 30 to drive the actuator 218 in the focus and tracking directions. Control is performed so that the incident light always follows the track of the optical card 11 in a focused state. Further, when reproducing data, the controller 28 causes the laser diode 211 to output a low-power reading light beam via the laser drive circuit 31, and also causes the motor servo circuit 25. Optical head drive circuit 17. The drive of the demodulation circuit 29 and the focus track servo circuit 30 is controlled, and data is reproduced by seeking to a desired track based on the track address information demodulated by the demodulation circuit 29. Also,
When recording data, the controller 28 seeks on a desired track to be recorded in the same manner as described above, and then directs a high-output recording light beam from the laser diode 211 via the laser drive circuit 31 depending on the data to be recorded. The data is modulated and output, and data is recorded on the corresponding track.

Further, a home position sensor 20 is provided for determining the position of the optical head 21 when the optical card 11 is inserted.

Next, referring to FIG. 1, the data section 15 in this embodiment will be explained.
The format will be explained.

As shown in FIG. 1(a), each data section 15 is provided with a preamble VFO5YNC1 on the end side, and this VF
Between O5YNC1 and recorded data (hereinafter referred to as recording DATA) 4, there is a recording DATA
Two synchronization patterns indicating the beginning of 4 5YNC-A 2
and 5YNC-B 3 are provided, and between the two synchronization patterns 5YNC-A 2 and 5YNC-B 3, there is a 5YNC-A 2,5YNC with a length that is half the size of 5YNC-A 2, for example. -B A special pattern 6 different from 3 is provided.

The data recording/reproducing method in this embodiment will be explained below with reference to FIGS. 1 and 8.

When recording data, the controller 28 in FIG. 8 first instructs the laser drive circuit 31 in FIG. Preamble VFO5 for recording high output recording light beam
The controller 28 instructs the laser drive circuit 31 to modulate and output the preamble VFO5YNC1 in the format of YNC1 and record the preamble VFO5YNC1 on the track.Next, the controller 28 instructs the laser drive circuit 31 to record the synchronization pattern 5YNCA2. The laser diode 211 modulates and outputs a high-output recording light beam into the format of 5YNC-A 2 to be recorded, thereby recording 5YNC-A 2 on the track. Next, the controller 28 instructs the laser drive circuit 31 to record the special pattern 6, and the laser drive circuit 31 directs the high-power recording light beam from the laser diode 211 into the format of the special pattern 6 to be recorded. The special pattern 6 is recorded on the track by modulating and outputting it. Similarly, synchronization pattern 5YNC-B 3
and recording DATA4 are recorded in order.

On the other hand, when reproducing data, the photodetector 2 shown in FIG.
The output signal of 17 is the preamplifier VFO5 in that signal.
Synchronization is established by YNC1 and the demodulation port #! of FIG. 8 is established. 29, synchronization pattern 5YNC-A 2 is detected, and the first
As shown in Figure (b), a 5YNC-A detection signal is output. Using this 5YNC-A detection signal as a reference, the following special pattern 6 and synchronization pattern 5YNC-B 3 are skipped, and recording DATA 4 is demodulated. If synchronization pattern 5YNC-A2 is not detected for some reason, 5YNC-A2 is detected as shown in FIG. 2(b).
Although the A detection signal is not output, the demodulation circuit 29 in FIG. 8 searches for synchronization pattern 5YNC-B3, and after detecting this synchronization pattern 5YNC-B3,
), the 5YNC-B detection signal is output, and the subsequent recording DA is performed using this 5YNC-B detection signal as a reference.
TA4 will be demodulated.

As an example in which synchronization pattern 5YNC-A2 is not detected, for example, as shown in FIG.
One example is the presence of defect 5 on NC-A 2. In such a case, as described above, the synchronization pattern 5YNC-83 will be detected and the recorded DATA4 will be reproduced.

Next, defect 5 is synchronous pattern 5YNC-A 2 and 5Y
The case where it exists between Nc-B3 will be explained.

As shown in Figure 3 (a), synchronization pattern 5YNC-A
Since the special pattern 6 is provided between 2 and 5YNC-B 3, the defect 5 is caused by the two synchronous patterns 5YNC-A.
Even if it is between 2 and 5YNC-83, Fig. 3 (, b),
As shown in (c), since two synchronization patterns can be detected, both the 5YNC-A detection signal and the 5YNC-B detection signal are output from the demodulation circuit 29 in FIG. Recorded data 4 following this can be reproduced normally. Also, if the defect 5 is between two synchronization patterns, one of the synchronization patterns and the special pattern 6
A single synchronization pattern is detected even if it exists across both.

Therefore, compared to the case where there is no special pattern 6 and two synchronization patterns are adjacent to each other, the possibility (probability) that the defect 5 spans two synchronization patterns is reduced, and the optical card 11
This means that a data section 15 that is resistant to the above defect 5 is constructed. That is, even if the defect 5 exists on the optical card 11, the synchronization pattern can be reliably detected during data reproduction, increasing the probability that the recorded DATA 4 can be reproduced normally.

Here, special pattern 6 is synchronization pattern 5YNC-A
The length of this special pattern 6 does not have to be half of 2, and may be the same length as the synchronization pattern or longer than the synchronization pattern. The size of the defect 5 may be determined based on the size of the defect 5, or the size of the defect 5 that can be tolerated by the recording/reproducing device may be determined in advance, and the size may be determined from that size.
A special pattern 6 is used to identify defects 5 that may exist on the optical card.
If the size is made slightly larger than the size of , the defect 5 will not straddle two synchronization patterns, and the synchronization pattern can be detected reliably.

Further, the special pattern 6 only needs to be different from the synchronization pattern. For example, the special pattern 6 may be composed of all 0's or all 1's. Furthermore, it can be configured freely, such as a random pattern if it is determined in advance. In addition to being different from the synchronization pattern, the recording DA
It may be a pattern that does not appear during TA. In addition, if it includes a pattern that is different from the synchronization pattern but appears in the recording DATA, the special pattern 6 and the recording DATA
synchronization pattern 5YNC-A so as not to be confused with
Starting from 2, special pattern 6 and synchronous pattern 5YNC
It is sufficient to count the time corresponding to the reproduction time of -83 (or the reproduction time of only the special pattern 6) and generate a prohibition gate signal that indicates that the reproduction signal during this period is not recording DATA.

Further, in this embodiment, the case where there are two synchronization patterns has been described, but the same structure can be used even when there are three or more synchronization patterns. .

Also, so far we have explained the synchronization pattern that indicates the beginning of recorded data, but as shown in Figure 4,
Even when the data section 15 is configured with a resynchronization pattern RSYNC7 provided between the beginning of the recording DATA4 and a plurality of recording DATA4, as shown in FIG. , and the special pattern 6 provided between them to form the resynchronization pattern R3YNC7, it goes without saying that it becomes resistant to defects 5 on the optical card 11.

In addition to the data section 15 of the optical card 11, as shown in FIG. Regarding 14B, the synchronization pattern (SYNC-A 2,5YNC-B
By providing a plurality of 3) and inserting the special pattern 6 between each synchronization pattern, the probability of correctly reproducing the address information 41 is increased, and therefore the probability of being able to seek to a desired track is also increased. The same effect as in the case of section 15 can be obtained. That is, even if there is a defect 5 on the optical card 11, it is possible to reliably detect a synchronization pattern when reproducing address information, increasing the probability that address information can be reproduced normally.

It should be noted that the present invention is not limited to the above embodiments, and can be applied not only to recording/reproducing apparatuses that use optical cards as recording media, but also to recording/reproducing apparatuses that use optical discs as recording media.

Furthermore, the present invention can be applied to any of the read-only type, write-once type, and rewritable type.

[Effects of the Invention] As explained above, according to the present invention, a plurality of synchronization patterns are provided as synchronization information for data or address information, and a pattern different from the synchronization pattern is provided between two adjacent synchronization patterns. Therefore, even if a defect exists between two adjacent synchronization patterns, there is a high possibility that at least one of the synchronization patterns will be detected, and even if a defect exists on the recording medium, the synchronization information will be reliably detected. This has the effect of being able to detect.

[Brief explanation of drawings]

Figures 1 to 11 relate to one embodiment of the present invention;
The figure is an explanatory diagram showing the format of the data section and the synchronization pattern detection signal, FIG. 2 is an explanatory diagram showing the synchronization pattern detection signal when there is a defect on one of the synchronization patterns, and the third
The figure is an explanatory diagram showing a synchronization pattern detection signal when there is a defect on the special pattern, Figure 4 is an explanatory diagram showing a format with a resynchronization pattern between recorded data, and Figure 5 is the resynchronization of Figure 4. FIG. 6 is an explanatory diagram showing the configuration of the pattern, FIG. 6 is an explanatory diagram showing the format of the ID section, FIG. 7 is an explanatory diagram showing the configuration of the optical card, and FIG. 8 is an explanatory diagram showing the configuration of the optical information recording/reproducing device. Figure 9 is an explanatory diagram showing the guide track and laser beam, Figure 10 is an explanatory diagram showing the photodetector, and Figure 11 is the main beam incident light 1 on the optical card.
12 to 17 are explanatory diagrams showing the relationship between the reflected light and the photodetector, and FIG. 12 is an explanatory diagram showing the format of the data section and the synchronization pattern detection signal.
Fig. 3 is an explanatory diagram showing the configuration and defects of the optical card, Fig. 14 is an explanatory diagram showing the synchronization pattern detection signal when a defect exists on the synchronization pattern, and Fig. 15 is an explanatory diagram showing the data section having two synchronization patterns. An explanatory diagram showing the format and the synchronization pattern detection signal, FIG. 16 is an explanatory diagram showing the synchronization pattern detection signal when there is a defect on one synchronization pattern in the Omatsu I of FIG. 15, and FIG. FIG. 16 is an explanatory diagram showing a synchronization pattern detection signal when a defect exists between two synchronization patterns in the format of FIG. 15; 1... Preamble VFO5YNC 2... Synchronization pattern 5YNC-A 3... Synchronization pattern 5YNC-B 4... Recording DATA 5... Defect 6... Special pattern 11... Optical card 14A, 14B・
...ID section 15...Data section 21...Optical head No. 9
Figure q2 Figure 11 Figure 12 Figure 13 Figure 14 et al. (b) SYNC-A moxibustion, 1. ? 1

Claims (2)

[Claims] (1) Used in an optical information recording and reproducing device that records and/or reproduces information by relatively moving a recording medium and an optical head, and is used in a synchronous information recording and reproducing device that records and reproduces synchronous information. A synchronization information recording and reproducing apparatus characterized in that a plurality of synchronization patterns are provided as the synchronization information for the data, and a pattern different from the synchronization pattern is provided between two adjacent synchronization patterns. (2) Address information in a synchronous information recording and reproducing device that is used in an optical information recording and reproducing device that records and/or reproduces information by relatively moving a recording medium and an optical head, and that records and reproduces synchronous information. A synchronization information recording and reproducing apparatus characterized in that a plurality of synchronization patterns are provided as the synchronization information for the synchronization information, and a pattern different from the synchronization pattern is provided between two adjacent synchronization patterns.