JPS61242371A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To shorten the seeking time of an optical head corresponding to a substitute track in case this substitute track to record or reproduce a series of information, by using a means to set plural substitute tracks after separating them from each other. CONSTITUTION:An optical head 6 is provided together with a substitute track separating means 1a, a nearest substitute track separating/setting means 1b and a substitute track recording means 1c respectively. The head 6 follows a guide track of an optical information recording medium 10. The means 1a sets plural substitute tracks on an optical information recording medium 10 after separating them physically from each other. The means 1b detects the substitute track nearest the position of the head 6. The means 1c records the prescribed information to said nearest substitute track.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an information recording/reproducing device.

[Prior Art J] In general, optical information recording and reproducing media can maintain a track density two orders of magnitude higher than that of magnetic recording media. In other words, since the aperture diameter of the laser beam can be narrowed to about twice as narrow, the track pitch can be reduced to 1.5 to 2.
．． It can be made 0gm. An optically detectable guide track is formed on the optical information recording/reproducing medium, and a tracking servo is applied to the guide track to record and reproduce information.

In order to efficiently record or reproduce variable length information on an optical information recording/reproducing medium, the recording guide track has a sector structure.

FIG. 5 is a diagram showing a sector structure in a conventional optical information recording medium.

Sector portions 31 to Sn are provided in each of the plurality of tracks, and each of these sector portions S l to Sn is provided with an address portion and a data portion. code a1
~an indicates the address part, and the code d l −
dn indicates a data portion.

FIG. 6 is a block diagram showing a conventional optical information recording/reproducing device.

In FIG. 6, all information to be recorded on the optical information recording/reproducing medium 10 is stored in the buffer memory 2 via the host interface 14 until the information recording operation is completed.

The information recorded in the buffer memory 2 is encoded in an ECC circuit 3 for error correction, and then sent to a digital modulation circuit 4.
The signal is digitally modulated and sent to the laser drive circuit 5.

At the same time, the optical head 6 follows the guide track of the optical information recording medium 10 while performing focus control and tracking control. On the other hand, microprocessor 1
The address reproducing circuit 12 reads the address where the optical head 6 is located, sets the difference between this address and the address of the sector in which predetermined information is to be recorded in the linear motor drive circuit 8, and adjusts the linear motor 9 according to the difference. move.

Then, the address where the optical head 6 is present at that time is read again, and it is determined whether or not the read address matches the target sector address. If there is a mismatch, the guide track of the target address is sought by repeating the above sequence.

When the read address and the target sector address match, the laser drive circuit 5 outputs the recording information sent from the digital modulation circuit 4 and records the information in the target sector.

After the laser outputs information to the optical information recording medium 10,
Immediately, the optical head 6 accesses the sector where the information was recorded again and reproduces the recorded information. This reproduced information passes through a waveform shaping circuit 11 and a digital demodulation circuit 13, and is subjected to error correction by an ECC circuit 3.

The ECC circuit 3 determines whether the error correction is OT or not, and if the error correction is possible, it is compared with information stored in the buffer memory and the existence of an error is checked again. If no errors occur at this stage,
It is determined that there is no error in the information recorded on the optical information recording medium 10.

On the other hand, in the ECC circuit 3, if error correction is not possible, or if an error is found as a result of comparison with information stored in the buffer memory, the optical head 6 accesses the front sector again. Write information to the target sector and repeat the above sequence.

This sequence is repeated until the error no longer exists, but if the error is not removed even after several attempts, the microprocessor 1 determines that there is a physical defect in the optical information recording medium 10.

Then, the use of the truck with the physical defect is immediately prohibited, and a decision is made to use a replacement truck. The alternative track in this case is called an "alternative track."

In the above case, the management information manages all sectors and all tracks on the optical information recording medium IO, but the microprocessor registers the use of the above alternative track and which alternative track to use in the above management information. do. Then, the information recorded in the sector in the track to which the physically defective sector belongs, other than the sector in which the error occurred, and the information stored in the buffer memory (
information that should be recorded in the sector where the above error occurred)
The microprocessor l instructs the transfer to the alternative track. The optical head 6 then accesses the designated substitute track, and the above transfer is performed.

In addition, in FIG. 6, the focus tracking circuit 7
, an address reproducing circuit 12 , a comparator 14 , and a head amplifier 15 are provided.

FIGS. 7A and 7B are diagrams each showing an optical information recording medium in a conventional device, and are diagrams showing the configuration of an alternative track.

For example, in FIG. 7(A), the alternative track Di
is provided near the outermost circumference, and when the optical head 6 is located at a point P1 on the innermost circumference, the time required for the optical head 6 to access the alternative track DI is approximately several hundred meters.
It will be 5ec.

In the example of FIG. 7(B), the alternative track D2 is provided near the innermost circumference, and when the optical head 6 is located at the outermost point P2, the optical head 6 is placed on the alternative track D2.
The access time will be approximately several hundred m5ec, similar to the above.

Next, a case will be described in which a series of information recorded using a track including an alternative track is reproduced.

First, the optical head 6 seeks an address instructed by the microprocessor 1 and sequentially reproduces predetermined information.

If the address instructed by the microprocessor l exists in the alternative track D1 or D2, the optical head 6 seeks the address in the alternative track and reproduces the information. In this case, Fig. 7 (A) or (B)
In this state, the access time of the optical head 6 becomes the longest, and takes about several hundred m5ec. Therefore, the conventional device has a problem in that the seek time of the optical head to the alternative track is long.

[Object of the Invention] The present invention has been made by paying attention to the problems in the above-mentioned conventional example, and when a series of information is recorded or reproduced using an alternative track, the optical head 6 is not able to perform a seek operation with respect to the alternative track. It is an object of the present invention to provide an information recording and reproducing device that can shorten the time.

[Embodiments of the invention] FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, an optical head 6, alternative track separating means 1a, nearest alternative track detecting means 1b, and alternative track recording means 1c are provided.

The optical head 6 follows the guide track of the optical information recording medium 10, and the alternative track separation setting means 1a physically separates and sets a plurality of alternative tracks on the optical information recording medium IO. The optical head 6 is
As in the conventional example, the guide track of the information recording medium 10 is followed. The nearest alternative track is one that detects the nearest alternative track from the position of the optical head 6 among one alternative track, and the alternative track recording means records predetermined information on the nearest alternative track.

FIG. 2 is a flowchart showing the operation in the above embodiment, and FIG. 3 is an explanatory diagram of the optical information recording medium in the above embodiment.

FIG. 4 is a block diagram showing details of the above embodiment,
Components that are the same as those shown in the conventional example of FIG. 6 are given the same reference numerals, and their explanations are omitted.

The microprocessor 21 has as its functions an alternative track separation setting means 1a, a nearest alternative track detecting means 1b, and an alternative track recording means IC shown in FIG. Furthermore, the management buffer memory 20 stores management information before recording on the optical recording medium 10.

First, before recording predetermined information on the optical recording medium 10, one alternative track is separated and set (31). For example, as shown in FIG. ．． e3, e4.・・・・・・・・・・・・
..., set em as an alternative track. This setting is made in the management information (directory) of the optical information recording medium 10. In the above case, alternative tracks e1 to a
The adjacent intervals of m are equal, but may be uneven,
The management information recorded on the optical information recording medium 10 is as follows.

It is stored in the management buffer memory 20.

Next, when recording a series of predetermined information, if it is found that there is a physical defect in the optical information recording medium 10, it becomes necessary to use an alternative track (32). Based on the management information stored in the management buffer memory 20, the microprocessor 21 selects one of the alternative tracks el-em that is the nearest alternative track from the current position of the optical head 6 and is a recordable track. is detected (S3).

Then, one track's worth of information is recorded on the most recent alternative track (S4), and the management buffer memory 20 records that the predetermined information has been recorded on that alternative track
The above management information is updated (35).

When it is impossible to correct an error in the content recorded in a sector of the optical information recording medium 10, the alternative track contains the recorded content of the error and the track to which the sector in which the error occurred exists. The contents recorded in other sectors are also recorded.

7 After that, the prescribed information is continued to be recorded one by one, and it is determined whether another physical defect exists (S
S) If the physical defect is found again, another nearest replacement track is detected and one track worth of new information is recorded therein in the same way as the above operation.

After doing this, it is determined whether or not recording of all information has been completed (S7), and if it has been completed.

Management information of the management buffer memory 20J: is written to the optical information recording medium (Sa).

Therefore, when a physical defect is discovered while attempting to record predetermined information on a certain track, there is a substitute track relatively close to the track, so the time required to seek the optical head 6 to the substitute track is short.

On the other hand, in order to reproduce the information recorded as described above, the optical head 6 seeks to reproduce the series of information from the beginning. If it is necessary to seek to one alternative track during this seek, the distance between the position of the optical head 6 immediately before seeking to the alternative track and the position of the alternative track to be sought after is relatively short. Second, the distance that the optical head 6 seeks to the alternative track during reproduction is short, and therefore the seek time is shortened.

The number of alternative tracks is determined according to the design, and the number of separated alternative tracks (number of alternative track groups) may be two or three.
If there are two separate numbers, which may be more than one,
Alternative tracks may be set at the outermost circumferential portion and the innermost circumferential portion of the optical information recording medium 10. If this is done, the longest seek time of the optical head 6 will be half that of the conventional example shown in FIG. become. When the number to be separated is three or more, the alternative tracks may be separated one by one or a plurality of alternative tracks may be separated.

Further, the above embodiment also includes each member shown in FIG. 6. Therefore, there is provided a reproduction means for reproducing the address information recorded at the beginning of the sector of the optical information recording medium 6, a management buffer memory 20 for storing the information recorded in the sector of the optical information recording medium 10, and a management buffer memory 20 for storing the information recorded in the sector of the optical information recording medium 10. Immediately after that, it is composed of a recognition means that reproduces the recorded information and recognizes the possibility of error correction.The explanation in letter L is for recording and reproducing information optically, but magnetically It can also be applied when recording and reproducing information. That is, a magnetic recording medium may be used instead of an optical information recording medium, and a magnetic head may be used instead of the optical head 6.

[Effects of the Invention] According to the present invention, when recording or reproducing a series of information using an alternative track, the optical seek time for the alternative track can be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the above embodiment. FIG. 3 is a plan view showing the optical information recording medium in the above embodiment. FIG. 4 is a block diagram showing the circuit of the Okagi embodiment. FIG. 5 is a diagram showing an optical information recording medium in a conventional device. FIG. 6 is a block diagram showing a circuit of a conventional optical information recording/reproducing device. FIGS. 7A and 7B are plan views showing examples of optical information recording media in conventional devices, respectively. ta: Alternative track separation setting means, lb: Latest alternative track detection means. 1c... Alternative track recording means, 6... Optical head as head. lO: Optical information recording medium on the information recording Q medium. Figure 2 Figure 3

Claims (16)

[Claims] (1) An information recording and reproducing apparatus that records and reproduces predetermined information on a predetermined information recording medium, the information recording and reproducing apparatus comprising an alternative track separation setting means that separately sets a plurality of alternative tracks. (2) The information recording and reproducing apparatus according to claim 1, wherein the information recording medium is an optical information recording medium or a magnetic recording medium. (3) In claim 1, the information recording device is characterized in that the alternative track separation setting means separates the alternative track into two parts and sets them on the information recording medium. playback device. (4) In claim 3, the alternative track separation setting means sets the alternative track separately into an outermost circumferential portion and an innermost circumferential portion of the information recording medium. Information recording and reproducing device featuring features. (5) In claim 1, the alternative track separation setting means is characterized in that the alternative track is separated into three or more parts and set on the information recording medium. Information recording and reproducing device. (6) The information recording and reproducing apparatus according to claim 5, wherein the alternative track separation setting means sets equal or uneven intervals between the alternative tracks. (7) Alternative track separation setting means that separates and sets a plurality of alternative tracks; A head that follows a guide track of an information recording medium; Among the alternative tracks, detects the alternative track closest to the position of the head. An information recording and reproducing apparatus comprising: a nearest alternative track detecting means; an alternative track recording means for recording predetermined information on the nearest substitute track; (8) The information recording and reproducing apparatus according to claim 7, wherein the information recording medium is an optical information recording medium or a magnetic recording medium, and the head is an optical head or a magnetic head. (9) In claim 7, the information recording is characterized in that the alternative track separation setting means separates the alternative track into two parts and sets them on the information recording medium. playback device. (10) In claim 7, the alternative track separation setting means sets the alternative track separately into an outermost circumferential portion and an innermost circumferential portion of the information recording medium. Information recording and reproducing device featuring features. (11) Claim 7 is characterized in that the alternative track separation setting means separates the alternative track into three or more parts and sets them on the information recording medium. Information recording and reproducing device. (12) The information recording and reproducing apparatus according to claim 11, wherein the alternative track separation setting means sets equal or uneven intervals between the alternative tracks. (13) In claim 7, when it is impossible to correct an error in the content recorded in a sector of the optical information recording medium, the alternative track includes: An information recording and reproducing apparatus characterized in that contents recorded in other sectors existing in a track to which the sector in which the error has occurred are recorded. (14) The information recording and reproducing apparatus according to claim 7, comprising a reproducing means for reproducing address information recorded at the beginning of a sector of the optical information recording medium. (15) The information recording and reproducing apparatus according to claim 7, characterized in that it is constituted by a buffer memory that stores information to be recorded in sectors of the optical information recording medium. (16) An information recording device according to claim 7, characterized in that the information recording device comprises a recognition unit that reproduces the recorded information immediately after recording the predetermined information in the sector and recognizes the possibility of error correction. playback device.