JP2624535B2 - Optical card recording and / or reproducing device - Google Patents

Description

The present invention relates to an optical card recording and / or reproducing apparatus for recording and / or reproducing data using an optical card.

[Conventional technology]

Data recording using an optical card as a recording medium and / or
Alternatively, in a reproducing apparatus, an optical card having a plurality of tracks parallel to each other and an optical head for optically recording and / or reproducing data on and from the optical card are respectively arranged in a track direction and a direction perpendicular thereto. The data is recorded and / or reproduced by relatively reciprocating motion.

FIG. 5 shows an example of the configuration of an optical card used in such an optical card recording and / or reproducing apparatus. This optical card 1 has a plurality of tracks 2 extending in the card longitudinal direction parallel to the card width direction. As shown in FIG. 6, each track 2 is composed of ID portions at both ends and a data portion for recording data therebetween, and the ID portion is an ID mark indicating an ID portion start point.
It has IDs 4a and 4b in which track information such as 3a and 3b and track addresses are recorded, and the data section has four sectors 6a, 6b, 6c and 6d divided by five sector marks 5. Usually, these ID portions and sector marks 5 are prerecorded. Incidentally, in such an optical card 1, an ID section is not provided for each sector in order to obtain a wide data recording area.

On the other hand, in an optical card, the amount of data recorded at one time varies depending on the application. Therefore, in order to effectively use the limited recording area, it is necessary to prepare a track format having a sector size suitable for the application. As one of the measures,
It is conceivable that a plurality of types of the above-mentioned sector marks are prerecorded on one card to form a track format having a plurality of different sector sizes. However, in this case, there is a problem that a track of a track format having a sector size not suitable for the application is unused, and a data recording area is wasted.

To solve such a problem, Japanese Patent Laid-Open Publication No.
No. 76 discloses recording tracks having two different track formats using an optical card comprising a track including a data portion without providing a prerecording area for dividing the data recording area into sectors as described above. A method for doing so is disclosed. Here, two types of track formats, that is, a data track that records one entire track as one sector and a directory track that manages the recording information written on this data track, are recorded on an arbitrary track. Here, in the directory track, three blocks of data are recorded on one track. A method of recording data on the directory track will be described with reference to FIG. FIG. 7 (a)
Shows a reproduced data signal, and (b) shows an output of a reproduction triggerable one-shot vibrator to which the reproduced data signal (a) is input, and reproduces an area where data is recorded when this signal is at a high level. It is shown that.
Also, (c) shows a signal that goes high for a certain period of time after detecting the falling edge of (b), and (d) shows a recording data signal that is output upon detecting the falling edge of (c). Has become. That is, in this recording method, the recording start point is determined based on the end point of the immediately preceding recorded block.

[Problems to be solved by the invention]

However, the optical card recording / reproducing apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 63-4476 has a problem that the access time becomes long. That is, in the optical card, in order to shorten the access time, data recording and / or data are performed in both directions of the relative reciprocating movement between the optical card and the optical head.
Alternatively, it is preferable to perform reproduction. However, as described above, when the data recording start point is determined based on the end point of the immediately preceding recorded sector, the optical card and the optical head at the time of recording and reproduction are used. Since the relative movement direction with respect to is limited to one direction, it takes time to access.
Also, for example, since it is not possible to record in the third sector after the first sector, the recording order is restricted,
There is also a problem that recording in an arbitrary sector cannot be performed.

The present invention has been made in view of the above-mentioned conventional problems. In both directions of the relative reciprocating motion between an optical card and an optical head, recording / reproducing of sector size data for various applications can be performed in an arbitrary sector. Therefore, an optical card recording and / or reproducing apparatus appropriately configured so that the recording area of the optical card can be effectively used without waste and the access time at the time of recording or reproduction can be effectively shortened. The purpose is to provide.

[Means for solving the problem]

In order to achieve the above object, according to the present invention, an optical card including a track having an ID section including a PLL synchronization pull-in area and a data section for recording a plurality of data in sector units, and an optical head are relatively moved in the track direction. In an optical card recording and / or reproducing apparatus for recording and / or reproducing data in sector units while reciprocating, the ID
Means for counting the PLL clock signal generated based on the read signal of the PLL synchronization pull-in area of the section, and detecting the relative position between the optical card and the optical head in the data section based on the count value. It is configured to record and / or reproduce data.

(Operation)

According to such an optical card recording and / or reproducing apparatus,
The recording / reproduction start point for each sector is determined by the relative positional relationship between the optical head and the optical card obtained by counting the PLL clock signal locked during the reproduction of the ID section, without depending on the situation of the recorded sector. Therefore, even in the data section without a prerecord area such as a sector mark for dividing the data recording area into a plurality of sectors, the ID section is provided on both sides of the data section, so that both directions of the relative reciprocating motion between the optical card and the optical head are provided. In this method, recording and reproduction of data having a sector size of various applications can be performed for an arbitrary sector, so that the recording area of the optical card can be effectively used without waste, and the access time during recording / reproduction can be effectively reduced. It can be shortened. Also, a PLL generated based on a read signal of the PLL synchronization pull-in area of the ID section.
Since the relative position between the optical head and the optical card is detected by counting the clock signal, even if the relative speed between the optical head and the optical card fluctuates, the recording / reproduction start point for each sector is shifted. Can be accurately recognized without the need. Therefore, there is no possibility that data already written in the ID portion or the data portion is overwritten in recording, or recorded data cannot be read in reproduction.

〔Example〕

First, a configuration example of a prerecord format of a track of an optical card used in the optical card recording and / or reproducing apparatus of the present invention will be described with reference to FIG. The overall configuration of the optical card is the same as that shown in FIG. This track is composed of ID sections 7a and 7b at both ends as in FIG. 6, and a data section 15 for recording data therebetween. ID part on the left
7a, from the left, a PLL synchronization pull-in area 8a, a byte synchronization signal 9a indicating the start of the ID 12a, a byte synchronization signal 10a, ID13 indicating the start of the ID 12a, ID 13a in which a track address or the like is recorded.
a, a byte synchronization signal 11a indicating the start of the ID 14a, and an ID 14a. The ID section 7b on the right side includes a PLL synchronization pull-in area 8b from the right, a byte synchronization signal 9b indicating the start of the ID 12b, and a byte synchronization signal 10b, ID13b, ID14b indicating the start of the ID 12b, ID 13b in which a track address or the like is recorded. It has a byte synchronization signal 11b indicating the start and an ID 14b. That is, in this embodiment, in order to increase the reliability of the track address,
In the ID sections 7a and 7b, IDs are triple-written. Each ID is recorded with an ID number for distinguishing it from other IDs, together with a track address. Further, the data section 15 has no pre-record area such as a sector mark for each sector so as to be compatible with various applications.

FIG. 2 shows an embodiment of the optical card recording and / or reproducing apparatus of the present invention using the above optical card. In this embodiment, the optical card 1 is moved in the track direction by an optical head.
21 is moved in the direction perpendicular to the track to record and reproduce data. The optical card 1 is mounted on a predetermined position of the conveyor belt 23 stretched between the pulleys 22a and 22b,
By driving the motor 26 via the motor drive circuit 25 under the control of 24, the motor 26 is reciprocated in the track direction.

The optical head 21 is configured to project writing or reading light from the laser diode 21a onto the optical card 1 via the optical system 21b, and to make the reflected light incident on the detector 21c. The output of the detector 21c is an ID PLL circuit 27,
The data is supplied to the data PLL circuit 28 and the demodulation circuit 29, and the ID PLL circuit 27 generates an ID reproduction PLL clock signal of a frequency locked synchronously based on the read output of the PLL synchronization pull-in areas 8a and 8b in FIG. The data PLL circuit 29 generates a PLL clock signal for data reproduction at a frequency locked synchronously based on the read output of the PLL synchronization pull-in area at both ends of the sector recorded in the data section 15 of FIG. I do. The output of the detector 21c is also supplied to a focus / track servo circuit 30, which detects a focus error signal and a track error signal so that the light incident on the optical card 1 always follows the track in a focused state. Next, the optical head 21 is driven and controlled in the focus and tracking directions.

Output from the ID PLL circuit 27 and the data PLL circuit 28
The ID reproduction PLL clock signal and the data reproduction PLL clock signal are supplied to a demodulation circuit 29, respectively, and supplied to the controller 24.
Under the above control, the output of the detector 21c is read, and the read signal is supplied to the controller 24 to detect the track address information and the data reproduction signal. The ID reproduction PLL clock signal generated from the ID PLL circuit 27 holds the frequency synchronously locked in the synchronization pull-in area 8a or 8b during the forward movement or the backward movement of the optical card 1. The PLL clock signal for ID reproduction, which is synchronously locked, is also supplied to the sector position detection circuit 31 to generate a sector position detection signal.

In reproducing data, the controller 24 first outputs a format selection signal indicating the type of the track format to the sector position detection circuit 31 to select a track format, and then outputs the low level signal from the laser diode 21a via the laser drive circuit 32. Outputs read light and controls the driving of the motor 26 via the motor drive circuit 25, and the sector position according to the track address information demodulated by the demodulation circuit 29 and the track format from the sector position detection circuit 31. Access is performed by seeking a desired sector of a desired track based on the detection signal. Also,
In data recording, a format selection signal is first output to the sector position detection circuit 31 to select a track format, and then a desired sector of a desired track on which data is to be recorded is sought. The laser diode 21a modulates and outputs the high-power writing light with the data to be recorded via the laser diode 21a, and records the data in the sector.

The sector position detection circuit 31 outputs a sector position detection signal when the optical head 21 reaches a position on the optical card 1 corresponding to a sector break according to the track format selected by the format selection signal from the controller 24. FIG. 3 shows an example of the circuit configuration. The sector position detection circuit 31 outputs a designated value corresponding to a sector delimiter position on the optical card in accordance with an input format selection signal.
34, a counter 35 that counts the ID reproduction PLL clock signal from the ID PLL circuit 27, and the output count value from the counter 35 is compared with a predetermined value output from the format selector 34. And a comparator 36 for outputting a sector position detection signal. Here, the counter 35 is initialized at a position serving as a reference of the optical card 1 with respect to the optical head 21. For example, when the byte synchronization signal shown in FIG. 1 is detected, the ID is reset and the subsequent ID is reproduced. If the ID is recognized as ID12a, the result is left as it is. If the ID13a is recognized, the result corresponds to the interval between ID12a and ID13a. Is preset. When the ID14a is recognized as a result of the reproduction, a predetermined value corresponding to the interval between the ID12a and the ID14a is preset. By doing so, it is possible to prevent an error in the initial setting of the counter 35 due to a byte synchronization signal detection error. The sector position detection signal obtained in this manner is supplied to the controller 24 and counted, whereby a desired sector is recognized. of course,
Such a counter is provided in the sector position detection circuit 31,
The count value may be given to the controller 24 as a sector number.

The ID reproduction PLL clock signal from the ID PLL circuit 27 can output pulses at a pitch of several μm in terms of the length on the optical card. Positioning for recording data into the device can be performed with high accuracy.

FIG. 4 is a flowchart showing an example of a case where a specific sector of a specific track is accessed in the above-mentioned optical card recording and / or reproducing apparatus using the optical card having the track of the prerecord format of FIG. First, in order to select a track format of a specific track, a format selection signal is sent to a sector position detection circuit.
Give to 31. Next, the ID section shown in FIG. 1 is read to seek the optical head 21 to a specific track to be accessed. That is, when the optical head 21 moves from left to right in the track direction with respect to the optical card 1 shown in FIG.
ID) of the ID section 7a shown in FIG.
When 14a is read and the track address is determined by majority logic, and the track moves from right to left (hereinafter referred to as the reverse direction)
Reads the IDs 12b, 13b and 14b of the ID section 7b shown in FIG. 1 and determines the track address by majority logic. Subsequently, the optical card 1 is moved in the track direction on the specific track, and the sector position detection signal output from the sector position detection circuit 31 is counted. The counter for counting the sector position detection signal is reset in advance each time the moving direction changes. When the count value matches the target sector number, access to that sector is performed. Here, the recognition of the sector number is performed as follows. That is, for example, in the case of accessing a track in a track format in which one track is composed of four sectors, if the access is in the forward direction, the count value = 1 and the sector number = 1.
And the count value = 2 becomes the sector number = 2 and the count value =
3 is sector number = 3, count value = 4 is sector number =
4 respectively. If the access is in the reverse direction, the count value = 1 becomes the sector number = 4, and the count value = 4.
2 is sector number = 3, count value = 3 is sector number =
2, and the count value = 4 corresponds to the sector number = 1. Recognition of whether the forward access is the reverse access can be easily obtained by the motor drive circuit 24.

According to this embodiment, it is possible to record a plurality of sectors for various applications on one track without providing a pre-record area for dividing the track into a plurality of sectors in the data portion of the track. The recording area can be used effectively without waste. In addition, the recording /
The reproduction start point does not depend on the situation of the recorded sector, and is based on the output of the sector position detection circuit 31 obtained by counting the PLL clock signal generated based on the read signal of the PLL synchronization pull-in area of the ID section. Therefore, even if the relative speed between the optical head and the optical card fluctuates, recording / recording on an arbitrary sector in one track is not affected.
Reproduction can be performed accurately. Further, in recording and reproducing data in both the forward and reverse directions to reduce the access time, when recognizing a sector number from the count value of the output of the sector position detection circuit 31, whether the recognition direction is forward access or reverse access. Can be easily realized simply by switching.

〔The invention's effect〕

As described above, according to the present invention, the recording /
The playback start point is recognized from the relative positional relationship between the optical head and the optical card obtained by counting the PLL clock signal locked during the playback of the ID section without depending on the situation of the recorded sector. Recording of data of sector size of various applications in both directions of the relative reciprocating movement between the optical card and the optical head without providing a prerecord area such as a sector mark for dividing the data section into a plurality of sectors. / Reproduction can be performed on an arbitrary sector. Therefore, even if the relative speed between the optical head and the optical card fluctuates, 1
Recording / reproduction to / from an arbitrary sector in a track can be performed accurately, the recording area of the optical card can be used effectively without waste, and the access time during recording / reproduction can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a prerecord format of a track of an optical card used in an optical card recording and / or reproducing apparatus of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. Is a block diagram showing an example of the configuration of a sector position detecting circuit shown in FIG. 2, FIG. 4 is a flowchart showing an access operation of the embodiment shown in FIG. 2, FIG. 5, FIG. 6, and FIG. FIG. 3 is a diagram for explaining the technique of FIG. 1. Optical card, 7a, 7b ID part 8a, 8b PLL synchronization pull-in area 15 Data part 21, Optical head 24 Controller 25 Motor drive circuit 26 Motor 27 …… ID PLL circuit 28 …… Data PLL circuit 29 …… Demodulation circuit 30 …… Focus / track servo circuit 31 …… Sector position detection circuit 32 …… Laser drive circuit 34 …… Format selector 35… Counter, 36 ... Comparator

Claims (1)

(57) [Claims] An optical card having a track having an ID section including a PLL synchronization pull-in area and a data section for recording a plurality of data in sector units, and a sector while the optical head relatively reciprocates in the track direction. In an optical card recording and / or reproducing apparatus for recording and / or reproducing data in units, a means for counting a PLL clock signal generated based on a read signal of a PLL synchronization pull-in area of the ID section is provided, An optical card recording and / or reproducing apparatus configured to detect a relative position of the optical card and the optical head in the data section based on the data recording and / or perform data recording and / or reproduction.