JPH0770153B2 - Optical card recording / reproducing device - Google Patents

Description

The present invention relates to a recording / reproducing apparatus for an optical card,
In particular, it relates to recording / reproduction when updating the optical card.

[Outline of Invention]

According to the present invention, in the optical card reproducing device, the information written in the optical card at the time of updating the optical card is compressed and re-recorded to improve the recording efficiency of the optical card and increase the number of additional recordings. is there.

[Conventional technology]

An optical card has been developed in which an optical recording medium film is sputtered or vapor-deposited on a card-shaped substrate and various data is recorded on the optical recording medium film as a track train.

That is, in this optical card, a laser beam modulated by a digital signal is irradiated while being scanned through a galvanometer mirror to form a recording track on the optical recording medium film, thereby writing data. . The reflectance of the portion where the track is formed is changed according to the recording data.

The data recorded on the optical card is read out by irradiating the track formed on the optical recording medium film of the optical card with light and receiving the reflected light. Since the reflectance of the portion where the track is formed is changed according to the recorded data, the data can be reproduced from the reflected light.
This data is read by irradiating the laser beam while scanning it along the track through the galvanometer mirror.
The reflected light may be received by a photo detector, or the light from the light emitting element may be applied to the track and the reflected light may be received line by line using a line sensor including an image sensor such as a CCD. You may do it.

This optical card is a write-once type recording medium, and data can be written additionally, but data cannot be erased and re-recording is not possible.

The characteristic of the optical card is that its storage capacity is much larger than that of the magnetic card. Therefore, for example, information on the balance of bank deposits, information on medical charts, etc. can be recorded on this optical card. In this way, various services can be realized by using the optical card.

For the recorded data of the optical card, deal with the deterioration of the optical card,
An error correction code is added to improve reliability. This error correction code is applied in units of sectors with a plurality of tracks as one unit so that strong error correction can be performed.

The size of one sector is, for example, about 512 bytes to 4 Kbytes, and the recording capacity of the optical card is, for example, 1.024 Mbytes. At the time of additional recording, since the error correction code is added in units of one sector as described above, it is necessary to write one sector even when recording short information of several bytes. Therefore, if the total recording capacity of an optical card is 1.024 Mbytes and the size of one sector is 512 bytes, the number of additional recordings per optical card is 2000 bytes.
Times.

[Problems to be solved by the invention]

As described above, the number of additional recordings on one optical card is conventionally 2000, for example. Since the data is additionally recorded on the optical card in units of one sector, the smaller the sector size is, the more efficiently the data is recorded and the more the number of times of additional recording. However, if the sector size is reduced, the error correction capability deteriorates, and the system reliability deteriorates.

By the way, when performing a service using an optical card, an old optical card is replaced with a new optical card once every two years, for example, in consideration of dirt and damage of the card. At this time, if the data written in the old optical card is directly copied to the new optical card, the recording efficiency does not change, and the number of additional recordings does not increase even if the data is updated to the new optical card.

The optical card has 1
Since writing is done in units of sectors, if the information that was written in multiple sectors when updating the optical card could be compressed and re-recorded, the recording efficiency of the optical card would increase and the reliability would deteriorate. Therefore, the number of additional recordings can be increased.

Therefore, an object of the present invention is to provide an optical card recording / reproducing apparatus capable of increasing recording efficiency and increasing the number of additional recordings by compressing and re-recording data when updating. .

[Means for solving problems]

According to the present invention, a reproducing means for reading and reproducing information recorded on a card, a storing means for storing information reproduced by the reproducing means, a discriminating means for discriminating an information amount of the reproduced information, and a storing means. And a recording means for recording the output of again on the card, the output signal of the discrimination means,
It is an optical card recording / reproducing device for compressing and re-recording information stored in a storage means.

[Action]

The data recorded on the optical card 11 before the update is read by the reading device 12 and decoded by the decoder 13. The output of the decoder 13 is written in the memory 14 word by word. The data recorded in the optical card 11 over a plurality of sectors is compressed and stored in the memory 14. The data amount of the memory 14 is determined by the data amount determination circuit 15. When the data which can be compressed is stored in the memory 14, the output of the memory 14 is sent to the encoder 17 and encoded. Data is written to the updated optical card 20 by the output of the encoder 17.

〔Example〕

An embodiment of the present invention will be described in the following order.

Optical card used in one embodiment b. Configuration of one embodiment c. Data compression processing in one embodiment a. Optical card used in one embodiment FIG. 2 shows the optical card 1 as a whole. is there. The optical card 1 is, for example, a resin substrate 2 on which an optical recording medium film (for example, Te-C film) 3 is sputtered or vapor-deposited. The optical card 1 is irradiated with a laser beam modulated by a digital signal while being scanned through a galvanometer mirror, and data is recorded. The recording track T is formed along the portion irradiated with the laser beam, and the reflectance of the portion where the track T is formed is changed according to the recording data. The data recorded on the optical card 1 is made by irradiating the track T with light and receiving the reflected light.

The optical card 1 used in the embodiment of the present invention has a second
As shown in the figure, the track T is recorded perpendicularly to the longitudinal direction of the optical card 1. A plurality of tracks T form one sector S, and the sectors S are arranged on the optical card 1 in a matrix. The size of one sector S is 512 bytes to 4 Kbytes. The recorded data is interleaved in units of sector S and has an error correction code. The total recording capacity of the optical card 1 is 1.024 Mbytes, for example. in this way,
Since the recording data is encoded and recorded in units of the sector S, it is necessary to write data for one sector even when recording several bytes of data.

b. Structure of an Embodiment FIG. 1 shows an embodiment of the present invention. This one embodiment is used when updating an optical card on which data is recorded as described above.

In FIG. 1, 11 is an optical card before the update. As described above, the recording data is written in the optical card 11 in units of sectors. The recorded data of the optical card 11 is the third
It is read by the reading device 12 as shown in the figure.

In FIG. 3, reference numeral 21 is a line sensor including, for example, a CCD image pickup device, and an image is formed on the line sensor 21 via the reflected light cylindrical lens 23 of the track T of the optical card 11. The optical card 11 is conveyed stepwise in the direction of arrow A along the guide roller 24. As a result, the optical information for each track T is imaged on the line sensor 21, and the output of the line sensor 21 is sequentially read.

In FIG. 1, the data read by the reading device 12 is supplied to the decoder 13. The decoder 13 performs processing such as deinterleaving and error correction for each sector on the data from the reading device 12, and the data is decoded for each sector.

The data from the decoder 13 is supplied to the memory 14 word by word. The memory 14 is provided with a memory area corresponding to the storage capacity of one sector.

As described above, even if the data recorded at one time is a few bytes short, the optical card 11 is written as data for one sector. Therefore, the data recorded in several sectors on the optical card 11 can be compressed as one sector data.

The data decoded by the decoder 13 is sequentially written into the memory 14 for each wort. As a result, the data recorded over several sectors on the optical card 11 is reduced to 1
It is compressed into sectors and stored in the memory 14. The amount of data recorded in the memory 14 is monitored by the data amount determination circuit 15. A control signal is supplied from the control circuit 16 to the memory 14 according to the discrimination output of the data amount discrimination circuit 15 to control the memory 14.

When the data recorded in a plurality of sectors on the optical card 11 is compressed as data for one sector and stored in the memory 14, the data in the memory 14 is read and this data is supplied to the encoder 17. The encoder 17 interleaves the output data from the memory 14 and adds an error correction code. The output of the encoder 17 is supplied to the writing device 18. The writing device 18 scans the laser light from the semiconductor laser 19 via a galvanometer mirror (not shown), and an optical card 20.
It is configured to irradiate. As a result, data is recorded on the updated optical card 20.

Since the data is compressed and recorded on the updated optical card 20, the recording efficiency is improved as compared with the optical card 11 before the update.

c. Data Compression Processing in One Embodiment The data compression processing in one embodiment of the present invention will be described in detail below.

In the memory 14, as shown in FIGS. 4 to 7, addresses (O to N) corresponding to one sector are prepared.

As shown in FIG. 8, the data amount determination circuit 15 is a register
It is composed of 31, a register 32, a register 33, and a comparator 34. Register 31 is provided to indicate the address K _a data loading is stored in the memory area shown in FIG. 4 to 7 FIG. Register 33 has memory 14
It is provided to indicate the final address N of the. Register 32 is the last address of the last sector data K _b
It is provided to indicate that.

First, as shown in the flow chart of FIG.
A command from 16 initializes the memory 14 and the registers 31 to 33. In the initial setting state, as shown in FIG.
Memory 14 is cleared, the value of the register 31 (indicating the address K _a) is a O, final address N is set in the register 33, the register 32 (indicating the address K _b), the final address N is set Be done. (Step).

When the memory 14 and the registers 31 to 34 are initialized, the reading device 12 reads data for one sector of the optical card 11 (step).

The data for one sector read by the reading device 12 is decoded by the decoder 13 to reproduce the data (step).

The data reproduced by the decoder 13 is stored in the memory 14 for each word.
Transferred to. At this time, the content of the register 31 is incremented each time data is transferred word by word. Address K _a stored data to be transferred by the value of the register 31 is indicated (step).

When the data from the decoder 13 is stored in the memory 14, it is determined whether or not all the data is stored in the capacity of the memory 14. When the address K _a coincides with the final address N,
As shown in FIG. 6, all the data is stored in the capacity of the memory 14. Address K _a was found from the contents of the register 31, the last address N is stored in the register 33. Therefore, as shown in FIG. 8, the output of the register 31 and the output of the register 33 are supplied to the comparator 34,
If the comparator 34 detects whether the output of the register 31 and the output of the register 33 match, it is possible to know whether or not all the data is stored in the capacity of the memory 14 (step).

If the data is not stored in all the areas of the memory 14, it is determined whether or not all the data recorded in one sector of the optical card 11 has been transferred. This judgment is made by the code indicating the data end recorded at the end of the data of one sector in the optical card 11. Alternatively, the determination may be made from data indicating the effective data amount shown at the beginning of one sector (step).

If all the data recorded in one sector has not been transferred, the process returns to step and the data transfer is continued word by word. By this loop, data is stored in the memory 14 word by word.

In the step, if it is judged that all the data for one sector in the optical card 11 has been taken into the memory 14, the address K _{a at} that time is stored as the address K _b up to the previous sector. That is, the register at that time
The value of 31 is saved in register 32 (step).

As a result, the data for one sector in the optical card 11 is stored in the memory 14.

Next, it is determined whether this sector is the last sector of the optical card 11. This judgment is made based on whether or not the data can be detected when reading the data at the position of the sector to be read next by the reading device 12 (step).

If it is not the final sector, the next sector is read (step) and the process returns to the step.

By the above loop, the data recorded in the plural sectors in the optical card 11 is compressed and stored in the memory 14
Stored in. By repeating this loop,
As shown in the figure, data is stored in all the capacities of the memory 14.

When it is judged in the step that the data has been stored in the entire capacity of the memory 14, the data from the beginning of the address to the address K _{b in} FIG. 6 is read from the memory 14 and sent to the encoder 17. That is, the memory 14
When the data is stored in all of the capacities, the data up to the previously read sector in the optical card 11 is completely stored in the memory 14, and the subsequent data is in the process of being read. The last address K _b of the previous sector was saved in register 32 in steps. Therefore, the data from the beginning of the address to the data of the address indicated by the register 32 is sent to the encoder 17. (Step).

The encoder 17 encodes the data read from the memory 14, and based on the output of the encoder 17, the optical card 20
Data is written to (step).

From the address next to the address K _b to the last address N, the data being read is stored. The data from the address next to the address K _b to the last address N is transferred from the first address to the address K _{a as shown} in FIG. That is, the data from the address to address N (the value of the register 32 + 1) is transferred to the data from the beginning of the memory 14, the address of the last data at this time is stored in the register 31 as the address K _a. The final address N is stored in the register 32. This is an optical card 11
This is to prevent the end address K _b of one sector from becoming unknown (step) because 100% valid data is recorded in one sector in the step, the step does not go to the step.

When it is judged in the step that the reading up to the last sector of the optical card 11 has been completed, the data up to the address currently stored in the memory 14 is sent to the encoder 17 (step).

The transmitted data is encoded by the encoder 17 and written in the optical card 21 (step).

The process of storing the output of the decoder 13 in the memory 14, compressing it, and sending it to the encoder 17 can also be processed by dropping it into a file in the computer.

In the above example, the compression process is performed while the optical card 11 is being read. However, when there is a large capacity memory, all the information of the optical card 11 is stored in the memory before the process is performed. You can also

Further, in one embodiment of the present invention, the data collected in the sector of the optical card 11 is also arranged in one sector at the time of updating. May be inserted and the delimiter code may be processed as a unit instead of the sector unit. By doing so, the data recording efficiency is further improved. Moreover, without providing such a unit,
Data may be completely compressed and written in the updated card. In this way, the data is written in the capacity of one sector of the updated optical card with no waste, and the recording efficiency is further improved. However, in this case, the updated optical card has data recorded between the sectors.

As described above, by compressing the data and re-recording it, a large amount of information can be stored in one sector, and the recording efficiency is improved. That is, before updating,
The information recorded over a large number of sectors S as shown in FIG. 10 can be recorded by a small number of sectors S as shown in FIG. 10B. Therefore, the updated optical card has a larger number of additional recordings than the optical card before the update.

Although the directory area is not set on the optical card in the example shown in FIG. 10, the directory area D may be set on the card as shown in FIG. In this case, after updating the optical card before updating shown in FIG. 11A, it is necessary to similarly compress and rewrite the directory as shown in FIG. 11B.

The present invention can be similarly applied to an optical card in which tracks T are formed parallel to the longitudinal direction of the optical card as shown in FIG.

〔The invention's effect〕

According to the present invention, at the time of updating, the data recorded on the optical card before updating over a plurality of sectors is compressed and re-recorded on the optical card after updating. In this way, if data is compressed and re-recorded, the recording efficiency is increased. Therefore, without degrading the reliability of the data,
The number of additional recordings can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a plan view of an optical card used in the embodiment of the present invention, and FIG. 3 is a perspective view of an example of a reading device in the embodiment of the present invention. FIGS. 4 to 7 are schematic diagrams used for explaining the state of the memory in one embodiment of the present invention, FIG. 8 is a block diagram of a data amount determination circuit in one embodiment of the present invention, and FIG. Is a flow chart used for explaining the operation of the embodiment of the present invention, FIGS. 10A and 10B are plan views used for explaining an example of the optical card updated by using the embodiment of the present invention, and FIG. 11A. FIG. 11B is a plan view used for explaining another example of the optical card updated by using the embodiment of the present invention, and FIG. 12 is a plan view used for explaining another example of the optical card to which the present invention can be applied. It is a figure. Description of main symbols in the drawings 11,20: optical card, 12: reader, 13: decoder, 14:
Memory, 15: data amount determination circuit, 17: encoder, 18: writing device.

Claims (1)

[Claims] 1. A reproducing means for reading and reproducing information recorded on an optical card, a storing means for storing the information reproduced by the reproducing means, and an amount of information stored in the storing means for compressing the information. An information amount discriminating means for discriminating whether or not has been stored, an encoding means for compressing the output from the storage means, and a recording means for recording the compressed output from the encoding means on the optical card again. An optical card recording / reproducing device provided.