JPS63244377A - Information recording method - Google Patents

Abstract

PURPOSE:To avoid overwriting and falling into an infinite loop by recording in a prescribed position a mark showing the presence or absence of an error in data which have been recorded in a data recording part and detecting the presence or absence of the mark at the time of recording. CONSTITUTION:Information is recorded in one recording part in an information recording medium in which plural recording parts 4 (41, 42...) are arranged in parallel, in 41, for example, and the presence or absence of the error of recorded information is detected. If there is no error, the mark showing the absence of the error is recorded in the prescribed position of the recording part 41. The presence or absence of the mark showing the absence of the error in the recording part 4 which is to record information previous to recording is detected. If there is the mark showing the absence of the error, the recording part 41 which is to record information is changed into a second recording part 43 ahead. Thus, overwriting can be avoided and recording can be continued without falling into the infinite loop.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for recording information on an information recording medium in which a plurality of recording units are arranged in parallel.

[Prior art]

2. Description of the Related Art Conventionally, various types of information recording media, such as disks, cards, tapes, etc., have been known for recording information using light and reading recorded information. Among these, card-shaped optical information recording media (hereinafter referred to as optical cards) are expected to be in great demand as compact, lightweight, portable, and convenient large-capacity information recording media.

FIG. 10 is a schematic plan view of the optical card, and FIG. 11 is a partially enlarged view thereof.

In FIG. 10, 1 is an optical card, 2 is an information track,
3 is the home position. Information is recorded on the optical card 1 as an optically detectable recording pit array (information track) by scanning the optical card with a light beam that is modulated according to recorded information and focused on a minute spot. At this time, information can be recorded and reproduced accurately without causing problems such as crossover of information tracks 2 (in order to
It is necessary to control the irradiation position of the light beam in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as AT). Furthermore, in order to stably irradiate a minute spot despite the bending or mechanical error of the optical card, it is necessary to perform control (autofocusing, hereinafter referred to as AF) in a direction perpendicular to the optical card. As shown in FIG. 11, between the information tracks 2 (21, 22, ...) of the optical card 1,
A tracking track 5 (51° 52 . . . ) for performing the AT is provided.

Next, a method of recording and reproducing information on an optical card will be explained.

In Figure 10, the light beam is initially at home position 3.
I'm in. Next, the light beam moves in the direction in the figure, finds the information track 2N to be recorded or reproduced, scans the information track 2N in the direction F in the figure, and records or reproduces the information.

Here, as a means for detecting whether or not it is a target information track, as shown in FIG. track number recording area (
In some cases, information tracks 2 (hereinafter referred to as preformats) 6 are provided, the recorded track numbers are read, and the contents are inspected to determine whether or not it is the desired information track. ,...) is recorded including the track number as write data, and to detect the track number, play the information track once, extract the track number part, and compare it with the target track number. has been adopted.

However, with the above method, since no information is written on the unrecorded track at the time of recording, it is impossible to determine whether it is the desired information track or not. When you follow me,
There was a problem with overwriting.

In addition, when the optical information recording medium is a write-once recording medium that cannot be erased, the recorded data is immediately reproduced and checked to see if it is the same as the recorded data (hereinafter referred to as "verify"), and as a result, If the information is incorrect, a recording method is used in which the information is recorded again on the next information track. However, there is a possibility that an error may occur when this information recording medium is reproduced.

If an error occurs, this is due to garbage during playback.

It is impossible to determine whether this is due to a scratch or an error that has existed since recording. During normal playback, when an error occurs, the playback is repeated, a so-called retry is executed multiple times, and when an error occurs, the next information track is played back. However, if there are many error tracks during recording, Because the number of tries increases,
There was a problem with the playback time being long.

[Summary of the invention]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an information recording method that can avoid overriding and shorten playback time.

Furthermore, according to the method of the present invention, when recording information one after another on parallel tracks, even if the recording means returns to the previous track due to dust, scratches, etc., an infinite loop will occur. You can continue recording without any trouble.

The above-mentioned object of the present invention is to provide a method for recording information on an information recording medium in which a plurality of recording sections are arranged in parallel, and to detect whether or not there is an error in the recorded information after recording information on one recording section. If there is no error-free mark, record a no-error mark at a predetermined position on this recording section, and detect the presence or absence of the no-error mark on the recording section on which information is to be recorded prior to recording, and detect whether there is an error-free mark. In this case, this can be achieved by changing the recording section on which information is to be recorded to the next recording section.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Note that an optical card will be explained as an example of the information recording medium used in the present invention.

First, the basic structure of the optical card and the structure of the optical head section will be explained. In the following description, the same members will be given the same numbers.

FIG. 2 is a schematic plan view of an example of an optical card used in the present invention.

FIG. 3 is a partially enlarged view of section A in FIG. 2.

In both figures, the optical card 1 has a tracking track 5 (51, 52, . . . ) formed in a continuous linear shape in advance.
) are arranged at equal intervals.

A data recording section 4 (4'l, 42°, . . .) for recording information between each tracking track is provided. That is, the optical card 1 has a data recording section located between each tracking track.

As shown in FIG. 3, tracking tracks 5-1 and 5
A G mark 7 is provided between the mark 1 and the mark 1. This O mark 7 is a mark for identifying a reference track, and is placed at a predetermined location on the optical card by preformatting. On the extension line of the data recording section 40 where the G mark 7 is located, a pattern 8 for medium type identification, which is an auxiliary data section, is recorded and formed by preformatting or by a light spot. This medium type identification pattern 8 represents the type of optical card, and information such as the modulation/demodulation method, data capacity per track, total number of tracks, etc. is recorded therein.

FIG. 4 is an explanatory diagram of the configuration of the optical head section of the information recording/reproducing apparatus.

FIG. 5 is an explanatory diagram showing a light beam irradiated onto an optical card.

FIG. 6 is an explanatory diagram showing the configuration of a photodetector.

A light beam emitted from a light source 27 such as a semiconductor laser is collimated by a collimator lens 28 and divided into three beams by a diffraction grating 30.

These light beams are directed by an objective lens 26 to a tracking track 51 .
52 and the data recording section 41, beam spots Sl, S2 . Form S3. Here, the optical card 1 is moved in the direction of arrow R by a driving means (not shown), and is scanned by the beam spot in the direction in which the tracking track extends. The reflected light from the beam spots Sl, S2 and S3 passes through the objective lens 26 again, is reflected by the beam splitter 20, and is projected by the condenser lens system 21 onto photodetectors 22, 23, and 24, respectively. The condensing lens system 21 is an astigmatism system, and is an example arranged so that autofocusing can be performed using a well-known astigmatism method. These photodetectors are constructed in the arrangement shown in FIG.

It is divided into four parts like B, C, and D. In FIG. 4, 29 is a prism for converting the cross-sectional distribution of the collimated light beam emitted from the semiconductor laser from an ellipse to a circular shape, and 25 is a mirror that guides the light beam to the objective lens 26.

Next, the operation of recording information on an optical card using the above-mentioned apparatus will be explained with reference to FIG.

First, when recording information in the data recording section 41, beam spots Sl, S2. S3 is connected to a tracking track 52, a data recording section 41, and a tracking track 5, respectively.
Irradiate to 1. These beam spots are scanned in the direction of arrow F by the movement of the optical card 1 as described above. The reflected light from the beam spot S1 is sent to the photodetector 22, and the reflected light from the beam spot S3 is sent to the photodetector 24.
The tracking signal is detected by the so-called three-beam method. That is, when the beam spots S1 and S3 deviate from the tracking track 52°51, a difference occurs in the intensity of light incident on the photodetectors 22 and 24, and a tracking signal can be obtained by comparing the signals from these light receiving surfaces. It is. Based on this tracking signal, the beam spot 31. S2 and S3 are moved together in a direction perpendicular to the scanning direction (second drawing direction) to perform AT. In the data recording section 41, the recording pits 31 are accurately recorded along the tracking tracks 51 and 52 by the beam spot S2 (.

Next, the information recording method of the present invention will be explained.

The information recording method of the present invention detects the presence or absence of the V mark in an information recording medium in which a mark (hereinafter referred to as ■ mark) indicating that there is no error in the data recorded in the data recording section is recorded at a predetermined position. The detecting means instantly determines whether or not the information track has been recorded, and when the detecting means detects that the information track has been recorded, the recording means and/or the reproducing means are moved to the next data recording section. It is something that makes you

FIG. 7 is an explanatory diagram of the operation of the information recording/reproducing apparatus of the present invention during recording on an optical card.

FIG. 8(A) is an explanatory diagram showing the locus of the light beam spot during recording, the vertical axis represents speed, and F and L correspond to F and L in FIG. 7.

FIG. 8(B) is an explanatory diagram showing recording timing, and H
IGH is a non-recording portion, and LOW is a recording portion.

FIG. 9 is a flowchart explaining the operation during recording.
In the figure, "F direction" indicates the direction of the light spot.

Hereinafter, the recording operation will be explained according to the flowchart in FIG. 9 while referring to FIGS. 7 and 8.

In FIG. 7, when the light spot is at point a, the light spot starts moving in the F direction at a low speed, and if no signal from the V mark appears before reaching the 0 point, recording is started. After recording is completed, the speed is set to high and the direction is set to L (point b). L
While moving in the direction, data is reproduced and errors are checked. When point C is reached, that is, after all data has been reproduced, the speed is lowered while the direction remains the same, and when point d is reached, if there is no error, the predetermined speed is A predetermined pattern, ie, a V mark, is recorded for a period of time. If there is an error, the recording control signal shown in Figure 8B is inhibited (dotted line).
■Prohibit recording of marks. In either case, after passing point e, the light spot is moved from the information track 41 to 42 and the same operation is repeated.

At this time, when trying to record on track 42 in the same way as before, the AT may come off and return to track 41 due to scratches, dust, etc. on the recording medium while moving from point a' to point e'. , just in the above example, track 41a4e
-+d→C→b→a'→e−+d... There is a possibility that the process will end up in an infinite loop.

Therefore, if the ■ mark is detected, tracks 41 to 4
Take the method of moving to 3. Thereby, the infinite loop can be avoided.

At this time, the track movement was set to two tracks, but the same effect can be obtained with two or more tracks. However, from the viewpoint of track utilization efficiency, it is not preferable to move too many tracks.

Also, although the speeds during recording and playback are different, the effect remains the same even if the speed is the same.

During playback, processing is slightly different depending on whether the light spot is at point a or point b at the start of playback. When at point a, if no signal due to the V mark is detected before reaching point 0, a track change is made at point b without performing data reproduction processing, and reproduction of the next information track is executed. On the other hand, when it is at point b, an error check is executed, and if no mark is detected, a track change is made regardless of whether there is an error or not, and reproduction of the next information track is executed. ■Even though the mark was detected,
If there is an error, try again a predetermined number of times.

As a result, when multiple information tracks are played back in succession in the same manner as with the E mark, even if there is an information track without the ■ mark (hereinafter referred to as a pad track), a try is performed to play that pad track. Since it is not necessary, even if there are a large number of pad tracks, the time required for reproduction will not be much longer than when there are no pad tracks.

As described above, by simply executing simple controls, overrides and falling into an infinite loop can be avoided, and playback time can be significantly shortened.

Next, the configuration of an information recording/reproducing apparatus that executes the method of the present invention will be explained.

FIG. 1 is a schematic diagram of an example of the configuration of an information recording/reproducing apparatus for carrying out the method of the present invention.

An information recording/reproducing device (hereinafter referred to as a drive) 19 is connected to a higher-level control device (hereinafter referred to as a CPU) 9, and performs data communication, control, etc. between the drive 19 and the CPU 9. The MPU10 in the drive 19 has a built-in ROM and RAM, and mainly controls the card feed motor 14 and head feed motor 13, and the AT/AF control circuit 11 receives signals from the photodetectors 22, 23, and 24. AF actuator 15. AT actuator 16 is driven. Furthermore, the modulation/demodulation circuit 12 executes recording by changing the emission intensity of the irradiation optical system 17 during recording, and the photodetector 2 during reproduction.
The data is demodulated based on the signal No. 3. However, when the card is inserted, the MPU 10 demodulates and identifies the medium type identification pattern 8 of the reference track shown in FIG.

Next, the recording and reproducing operation by the information recording and reproducing apparatus will be explained using FIGS. 1, 2, and 12.

First, after inserting the optical card 1, an operation is performed to search for a reference track (hereinafter referred to as track 00). The operation is as follows: First, when the light spot is at the home position 3 due to the above operation, the MPU10 drives the head feed motor 13 so as to move the optical pickup 18 in the second direction. As shown, the output 22-1 of the photodetector 22 corresponding to the light spot S1 will be at time j if nothing is written between the tracking tracks, and will be at time k if anything is written between the tracking tracks. , the control circuit measures the interval at which the optical spot traverses the tracking track to find the G mark 7, or moves the optical card 1 in the L and F directions and locates the G mark at a predetermined position for each track. The presence of the optical card is inspected to find the G mark 7, and when the G mark is detected, the head feed motor 13 is stopped, the optical card is returned to the F direction, then moved to the L direction, and the G mark is detected again. This confirms that the current information track is track OO.

After detecting the G mark 7, the optical card 1 is sent directly in the L direction (the optical spot is in the F direction), and the MPU10 is placed on track 00.
The medium type identification pattern 8 (shown in FIG. 3) recorded in the image data is read. This medium type identification pattern 8 is registered in advance in the ROM in MPU10 with the type to which the information recording/reproducing device should be applied. If possible, send the identification information of the optical card to the CPU 9,
If it is not possible, the information that “recording/playback is not possible” is sent to the CPU.
Send to 9.

Also, when applicable, MPU10 notifies CPU9 that it has become unit ready.

Upon receiving this, the CPU 9 sends a recording or playback command to the MPU.
Send to l0. To explain the reproduction operation again using FIG. 7, when the optical spot is at point a, the optical card 1 is
(that is, the light spot is in the F direction), and it is confirmed whether or not an E mark or a V mark exists before reaching the 0 point, and this is stored. After reaching the 0 point, the data demodulation signal from the modulation/demodulation circuit 12 is stored in the RAM within the MPU 1'O, and an error check is executed. - After storing all the data for the information track and executing an error check, whether or not there was a V mark on the information track during the current playback (R
AM) is checked, and if there is a ■ mark and there is an error, the card feeding direction is reversed and playback (retry) is performed again. (2) If there is a mark and there is no error, a track change is made to prepare for the next playback operation, and the MPU10 transfers the played data to the CPU9. ■If there is no mark, change the track and play the next track regardless of whether there is an error. Due to the effect of this V mark, even if a playback error occurs, it can be immediately determined whether the cause is an error during recording or not, so there is no need to run a try if it is unnecessary (, throughput is improved.

〔Effect of the invention〕

As described in detail above, according to the information recording method of the present invention, a mark indicating the presence or absence of an error in data recorded in the data recording section is recorded at a predetermined position, and the presence or absence of the mark is detected at the time of recording. This allows you to avoid overrides and falling into infinite loops.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of an information recording/reproducing apparatus for carrying out the method of the present invention. FIG. 2 is a schematic plan view of an example of an optical card used in the present invention. FIG. 3 is a partially enlarged view of section A in FIG. 2. FIG. 4 is an explanatory diagram of the configuration of the optical head section of the information recording/reproducing apparatus. FIG. 5 is an explanatory diagram showing a light beam irradiated onto an optical card. FIG. 6 is an explanatory diagram showing the configuration of a photodetector. FIG. 7 is an explanatory diagram of the operation of the information recording/reproducing apparatus of the present invention when recording onto an optical card. FIG. 8(A) is an explanatory diagram showing the locus of the light beam spot during recording, and FIG. 8(B) is an explanatory diagram showing the recording timing. FIG. 9 is a flowchart illustrating the operation during recording. FIG. 10 is a schematic plan view of a conventional optical card.
Figure 1 is a partially enlarged view. FIG. 12 is an explanatory diagram of the reference track detection operation. 1------ One optical card 9------ CPU 1 0------ MPU 11------ AT/AF control circuit 12------
1 Modulation/demodulation circuit 13 ----- Head feed motor 14 --- 1 Card feed motor 15 -- 1 --A F actuator 16 ----- A T actuator 17 -----
Irradiation optical system 18 --- One optical pickup 19 --- Drive

Claims (1)

[Claims] (1) In a method of recording information on an information recording medium in which multiple recording units are arranged in parallel, after recording information in one recording unit, the presence or absence of an error in the recorded information is detected, and if there is no error, records an error-free mark at a predetermined position on this recording section, and detects the presence or absence of the error-free mark on the recording section where information is to be recorded prior to recording, and if there is an error-free mark, An information recording method characterized by changing the recording section on which information is to be recorded to the next recording section.