JPS63204566A - Method and device for recording and reproducing information - Google Patents

Abstract

PURPOSE:To increase information recording and reproducing speed by detecting a tracking track and an error existence mark while moving a recording and reproducing means only in a direction intersecting an information track and accessing an objective information track. CONSTITUTION:A recording and reproducing device 19 moves an optical card 1 in an F direction immediately after commanding an objective track number and moves an optical beam spot to a position corresponding to an error existence mark 9. Then, the optical head 18 is moved in a D direction by a driving motor 13, the optical beam spot is moved on the optical card 1 in the D direction and reflected beams from the optical beam spots are detected by photodetectors 22-24 to count up the number of tracking tracks 5 and the number of error existence marks 9. Consequently, a required information track can be rapidly accessed while moving the recording and reproducing means relatively to an information recording medium only in a direction intersecting the information track and the information recording and reproducing speed can be increased.

Description

[Detailed description of the invention] [Industrial use! ′? ] The present invention relates to an information recording and reproducing method and an information recording and reproducing apparatus, and more particularly to an information recording and reproducing method and an information recording and reproducing apparatus that have improved accessibility to a target information track of an information recording medium. It is suitably applied to a playback device.

[Prior art and its problems] Conventionally, the forms of media for recording information using light and reading the recorded information include disk-shaped, card-shaped,
Various types such as tape-shaped ones are known. These optical information recording media include those capable of recording and reproduction, and those capable of only reproduction.

Information is recorded on a recordable medium by scanning an information track with a light beam that is modulated according to the recorded information and focused into a minute spot, and the information is recorded as an optically detectable information bit string. .

Furthermore, in order to reproduce information from a recording medium, the information bit string of the information track is scanned with a light beam spot having a constant power such that no recording is performed on the medium, and reflected light or transmitted light from the medium is detected. This is done by

A so-called optical head is used to irradiate a light beam spot onto a recording medium and detect reflected light or transmitted light from the medium as described above. The optical head is movable relative to the recording medium in the direction of the information track and in a direction across the direction, and this relative movement causes the light beam spot to scan the information track.

Among the optical information recording media mentioned above, card-shaped optical information recording media (hereinafter referred to as "optical cards") are expected to be in great demand as compact, lightweight, easy-to-carry, and relatively large-capacity information recording media. It is.

FIG. 16 is a schematic plan view of a write-once optical card, and FIG. 17 is a partially enlarged view thereof.

In FIG. 16, on the information recording surface of the optical card 1, a large number of information tracks 2 extending in the direction of the LF force are arranged in parallel. Further, a home position 3 is provided on the information recording surface of the optical card 1, which serves as a reference position for accessing the information track 2. The information track 2 is 2-1.2-2.2-3 in order from the one closest to the home position 3.・
...It is arranged as a conflict. The information tracks 2 include those on which information has already been recorded (hereinafter referred to as "recorded information tracks") and those on which information has not yet been recorded (hereinafter referred to as "recorded information tracks").
There are two types of tracks: "unrecorded information track"). Information can be recorded on the unrecorded information track at any time.

As shown in FIG. 17, a tracking track (for example, 5-1.5-2.5-3) is provided between each information track 2 (for example, 2-1.2-2). .

The tracking track is used as a guide for auto-tracking (AT), which controls the optical beam spot so as not to deviate from a predetermined information track when scanning the optical beam spot during information recording and reproduction.

When recording or reproducing information, the light beam spot is first located at home position 3, and the target information track is accessed from this position.

Whether the information track is a target information track or not is identified by the information track number. For example, by forming a track number preformat in area 6 on the extension of the tracking track as shown in FIG. 17, the number area is read by reciprocating the optical card in the LF force direction with respect to the optical head. , the light beam spot position can be confirmed based on the reading result. As another example, for example, when recording information on an information track, by recording a track number for each information track, the optical card is reciprocated in the LF force direction with respect to the optical head, and the information is recorded. The light beam spot position can be confirmed by reading the track and extracting the track number from the track number based on the read result.

However, in the conventional information recording/reproduction as described above, in order to identify the target information track, it is necessary to read and confirm the track number while moving the optical card in the LF force direction. The problem was that it took a long time to access.

Therefore, the present invention allows an information recording/reproducing head to access a desired information track on a recording medium in a short time,
The purpose is to improve the speed of information recording and reproduction.

[Means for Solving the Problems] According to the present invention, in order to achieve the above objects, a plurality of information tracks and a plurality of tracking tracks are arranged in parallel, and each recorded information track has a Correspondingly, if there is an error in the recorded information of the information storage device 2, a method for recording information on an information recording medium on which an error mark is recorded and/or reproducing already recorded information on the information recording medium. In this method, tracking tracks and error marks are detected while moving the recording/reproducing means relative to the information recording medium only in the direction across the information track, and the number of valid information tracks passed is counted based on the number of detected marks. An information recording and reproducing method characterized by accessing an information track.

And, if a plurality of information tracks and a plurality of tracking tracks are arranged in parallel and there is an error in the recorded information of the information track corresponding to each recorded information track, an error mark is recorded. In an apparatus for recording information on a recording medium and/or reproducing previously recorded information on the information recording medium, means for detecting a tracking track and an error mark, and counting the number of detected tracking tracks and error marks. An information recording/reproducing device is provided, characterized in that it has a means for.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic plan view showing an optical card used to implement the information recording and reproducing method according to the present invention.

In FIG. 1, a large number of information tracks 4 extending in the LF force direction are arranged in parallel on the information recording surface of an optical card 1, and a home position 3 serving as a reference position for accessing the information tracks 4 is arranged in parallel. It is provided. This home position may be a virtual one, and the information tracks 4 are arranged in order from the one closest to the home position 3.
0°4-1.4-2.4-3. ...4-(n+1)
are arranged. Tracking tracks 5-0 and 5-1 for each of these information tracks
, 5-2, 5-3, . . . 5-(n+1) are provided. Note that a tracking track 5-a for guarding is provided adjacent to the tracking track 5-0 and on the opposite side from the tracking track 5-1.
Similarly, adjacent to the tracking track 5-(n+1) and on the opposite side from the tracking track 5-n, there is a tracking track 5-(n+2) with a guard holder.

5-(n+2)' is provided. An appropriate number of these guard tracks can be provided.

FIG. 2 shows a partially enlarged view of the optical card shown in FIG. 1 above.

As shown in FIG. 2, a G mark 7 is recorded in advance on the information track 4-0. The G mark is for indicating that the information track is the reference track, and therefore the information track 4-0 is the reference track. A pattern 8 for recording medium identification is recorded on the reference track.

The recording medium identification pattern indicates the type of the optical card, and indicates information regarding the optical card such as the modulation/demodulation method, the data capacity per 1 information track, and the total number of tracks. These G marks 7 or recording medium identification patterns 8 are formed by preformatting like the tracking track, or by recording with a light beam spot.

In FIG. 1, among the information tracks 4-1 to 4-n, information has already been recorded on the information tracks 4-1 to 4-m, and these information tracks are already recorded information tracks. Further, information has not yet been recorded on the information tracks 4-(m+1) to 4-n, and these information tracks are unrecorded information tracks. - H. An error mark 9 is attached to the end of each recorded information track in the L direction if there is an error in the information recorded on the information track. The error mark is recorded by recording information on the information track and then reproducing the recorded content to determine whether or not there is an error, and only if there is an error, it is recorded at a predetermined position using a light beam spot. It is something. In the case of FIG. 1, an error mark is attached corresponding to the information track 4-1, so there is an error in the information recorded on the information track 4-1.

As shown in FIG. 1, a G mark 7' is also recorded on the information track 4-(n+1), and this information track is also used as a reference track. However, this reference track is a reference for the directory, and the directory information of the recorded information track is the information track 4-(n+1).
recorded in Then, each time an additional recording is performed on an unrecorded information track, the directory information is additionally recorded. When the reference track 7' is filled, directory information is sequentially recorded on the information tracks 4-n, 4-(n-1), . . . .

As shown in FIG. 1, a small hole 40 is formed in the upper left corner of the optical card 1. As shown in FIG.

FIG. 3 is a block diagram schematically showing the configuration of an embodiment of an information recording and reproducing apparatus according to the present invention for recording information on the optical card l as described above and reproducing the information recorded on the optical card. It is.

In FIG. 3, numeral 19 indicates a recording/reproducing device, and a CPU 50, which is a higher-level control device, is connected to this device. In the recording and reproducing device g1119, 14 introduces the optical card 1 into the recording and reproducing device via a transport mechanism (not shown), moves it back and forth in the R direction at a predetermined recording and reproducing position, and then ejects it out of the device. It is a drive motor for.

Reference numeral 17 denotes a light beam irradiation optical system including a light source, which forms a light beam spot on the optical card 1 during information recording and information reproduction. A beam spot is formed.

22 to 24 are photodetectors, each of which can receive the reflected light of the three light beam spots on the optical card l. Reference numeral 15 is for performing autofocusing (AF) by driving a part of the light beam irradiation optical system 17 to move the focus position of the light beam spot on the optical card surface in the Z direction, that is, in the direction perpendicular to the optical card surface. An AF actuator 16 drives a part of the light beam irradiation optical system 17 to direct the light beam spot on the optical card surface in the Y direction (i.e.
This is an AT actuator for performing AT by moving in a direction perpendicular to both the R direction and the Z direction.

Said light beam irradiation optical system 17. Photodetectors 22-24, A
An optical head 18 includes an F actuator 15 and an AT actuator 16.

Reference numeral 13 denotes a drive motor for moving the optical head in the Y direction to access the optical beam spot to a desired track on the optical card.

The drive motor 13 and the drive motor 14 are MPU10.
controlled by Further, the outputs of the photodetectors 22 to 24 are input to an AT/AF control circuit 11, and based on this, the control circuit controls the AF actuator 15 and AT actuator 16 to perform AF and AT. The outputs of the devices 22 to 24 are also input to the modulation/demodulation circuit 12, where the read information is demodulated and the demodulated signal is sent to the MPUI O. Moreover, the modulation/demodulation circuit 12
modulates the information signal sent from the MPU 10,
The light beam irradiation optical system 17 is driven according to the modulation signal to record information.

The MPUI O is controlled by the CPU 50 and exchanges data with the CPU.

FIG. 4 is a perspective view showing details of the optical head portion of FIG. 3 above.

In FIG. 4, 27 is a semiconductor laser serving as a light source;
28 is a collimator lens, 29 is a light beam shaping prism, 30 is a diffraction grating for splitting the beam, 20 is a beam splitter, 25 is a reflecting prism, 26 is an objective lens, 21 is an astigmatism condensing lens system, and 22 to 24 are the photodetectors described above.

The light beam emitted from the semiconductor laser 27 becomes a diverging light beam, enters the collimator lens 11, and is converted into a parallel light beam by the lens. The parallel light beam is shaped into a predetermined light intensity distribution by a light beam shaping prism, and then enters the diffraction grating 30.

The diffraction grating splits the light into three effective light beams (O-order diffracted light and ±1st-order diffracted light). These three light beams then enter the beam splitter 20, pass straight through, are reflected by the reflection prism 25, and are reflected by the objective lens 26.
It is focused by passing through the optical card 1, and three minute light beams (sub)Sl(+
), 32 (corresponding to O-th order diffracted light), and 53 (corresponding to −1st-order diffracted light).

The light beam spots 31, 33 are located on the adjacent tracking track 5, and the light beam spot S2 is located on the adjacent tracking track 5.
It is located on the information track 4 between the two king tracks. In this way, the reflected light from the light beam spot formed on the optical card passes through the objective lens 26, is made almost parallel, is reflected by the reflection prism 25, is further reflected by the beam splitter 20, and is focused by the condenser lens system 21. and enters the photodetectors 22, 23, and 24.

Figure fJIj5 is a diagram showing the configuration of the photodetectors 22 to 24. The photodetector 23 is a four-part photodetector.

FIGS. 6(A), (B), and (C) are a side view, a plan view, and a front view showing essential parts of the optical card transport mechanism in the recording/reproducing apparatus.

In these figures, reference numeral 35 denotes an optical card introduction/ejection roller, which is activated by the driving force of the drive motor 14 after a photodetector (not shown) detects that the optical card 1 has been inserted into the recording/reproducing device. The optical card 1 is driven in the L direction toward the recording/reproducing position. The movement status of the optical card 1 at this time is detected using the light emitting element 37 and the light receiving element 36. Reference numerals 38 and 39 denote rollers used to move the optical card 1 introduced as described above to the recording/reproducing position, and then reciprocating it in the LF force direction at the recording/reproducing position. Note that an appropriate number of rollers similar to this roller are arranged along the LF force direction.

These rollers are driven based on the driving force of the drive motor 14 after the arrival of the optical card at the recording/reproducing position is detected by the light emitting element 37 and the light receiving element 36.

Next, an embodiment of information recording and reproducing using the above-described optical card and recording/reproducing apparatus will be described.

First, the optical card 1 is introduced into the recording/reproducing apparatus, and the optical card 1 is moved in the direction L by driving and rotating the roller 35 shown in FIG.

FIG. 7 is a diagram showing a signal outputted from the light receiving element 36 of FIG. 6 when the optical card 1 is introduced. When the position f (i.e., the tip of the optical card) shown in FIG.
The level becomes IGH, and when the area from position g to position 21h shown in FIG. 1 (that is, the small hole 40) is located at the light receiving element position, the level becomes LOW again. By obtaining a signal with such a pattern and calculating the distance between f and g from the signal and confirming that it is a predetermined distance, it is possible to determine that the optical card 1 has been introduced in the correct orientation. can. If the above signal is not obtained and it is determined that the optical card introduction posture is incorrect, immediately reverse the roller 35, eject the optical card l from the recording/reproducing device, and use a lamp, buzzer, or other means to Warn the operator,
Encourage the introduction of optical cards with the correct posture.

When it is determined that the optical card 1 has been introduced in the correct posture, the movement of the optical card in the L direction by the rollers 35 and 38, 39 is further continued, and stopped after a predetermined time after the detection of the small hole 40. I am forced to do it. At this stop, the light beam spot is exactly located at home position 3.

Next, in order to access the reference track 4-O with the light beam spot, the optical head 18 is moved in the direction D in FIG. 1 by the drive motor 13. With this movement, a signal as shown in FIG. 8 is obtained from the photodetector 23 corresponding to the light beam spot S2. As shown in FIG. 1, since the G mark 7 is provided at a position corresponding to the home position 3, the tracking track 5-
Until the detection of 0, the interval j appears, but when the G mark 7 is detected, a relatively short interval k appears. Therefore, the movement of the optical head 18 is stopped when such an interval k appears.

Then, the transport mechanism is driven by the drive motor 14 to once move the optical card l in the direction F, and the light beam spot S
After detecting that there is no error mark by receiving the reflected light from the photodetector 23, the optical card 1 is moved in the direction of L to reproduce the recorded information. 8 is read, it is determined whether the optical card is applicable to the present apparatus recorded in the ROM in the MPU10, and the result is sent to the CPU 50.

Next, return the light beam spot to home position 3,
Further, by moving the optical head 18 in the direction D using the drive motor 13, the light beam spot is moved to the outside of the -H tracking track 5-(n+2)', and then the light beam spot S2 is moved in the opposite direction to D. Move it in the same way as accessing the reference track 4-0 above.

The reference track 4-(n+1) is accessed, and the directory information which is the recorded information of the information track is similarly read out and recorded in the RAM in the MPU10. Then, return the light beam spot to home position 3.

Next, when recording information, a recording command signal is input from the CPU 50 to the MPU 10 of the recording/reproducing apparatus, and the
Based on this, the PU determines a logical track number corresponding to the first information track 5-(m+1) among the unrecorded information tracks. The logical track numbers are assigned sequentially from the reference track 4-0, except for the track with an error among the recorded information tracks (that is, the information track to which the error mark 9 is attached).

Immediately after receiving the track number command, the recording/reproducing device moves the optical card l in the direction of a predetermined distance F, and moves the light beam spot to the position corresponding to the error mark.

Next, with the optical card l stationary, the drive motor 13
The optical head 18 is moved in the direction D to move the light beam spot on the optical card 1 in the direction D. and,
At this time, the photodetector 23 detects the reflected light from the light beam S2 to count the number of tracking tracks and the number of error-free marks.

FIG. 9 shows a partially enlarged schematic diagram of the optical card 1. As shown in FIG.

As shown in the figure, since the recorded information track 4-1 is a track with an error, an error mark 9 is attached thereto. FIG. 10 is a diagram showing the output of the photodetector 23 when counting tracking tracks and error-free marks due to the above movement. There is. The signal appears every time there is a tracking track and an error mark 9.

If there is an error mark 9, the adjacent tracker 7
Since the error mark is detected in the middle of the detection of the king track, a time T, which is 1/2 of the tracking track detection interval, is set in a timer or the like as shown in FIG. 10, and the light is detected at each time T. By looking at the device output, it is possible to count both tracking tracks and error marks.

Therefore, the logical track number can be immediately detected by subtracting the number of error marks from the number of tracking tracks counted by the movement of the light beam spot. In addition, the guard track portion is excluded from the counted value in advance.

The desired information track 4-(m+1) can be accessed immediately.

In this way, information is recorded on the target information track after access to the target information track is completed. 11th
The figure is a diagram showing the relationship between a light beam spot and a track during recording. Optical beam sub-board) Sl and S3 are tracking tracks 5-(m+1) and 5-(m+2), respectively.
The reflected light of the light beam spot is detected by the photodetectors 22 and 24, respectively, and the AT actuator 16 is driven so that the amounts of received light are equal to perform AT. Furthermore, the light beam spot S2 is located on the information track 4-
(m+1), and as the optical card moves, information bits 31 are recorded with modulated light.In addition, the reflected light from the light beam spot S2 is detected by the 4-divided photodetector 23, and the light is received by each divided portion. AF is performed by driving the AF actuator 15 so that the amounts are equal.

In FIG. 11, the three light beam spots are arranged in a direction perpendicular to the information track, but they may be arranged diagonally as shown by broken lines in the same figure.

FIG. 12 is a diagram for explaining in more detail the operation during information recording.

In FIG. 12, numeral 35 indicates the moving path of the light beam spot S2, and FIG. 13(A) is a diagram showing changes in the moving speed of the light beam spot S2 as the light beam spot S2 moves as described above, and FIG. 13 (CB) FIG. 2 is a diagram showing the recording timing associated with the movement. Further, FIG. 14 is a flow diagram illustrating operations during information recording.

After accessing the target information track, move the optical card 1 in the direction of L and move the optical beam (S2) to the position 1.
The optical card is moved from 1a in the direction of F at a relatively low speed. At this time, information is recorded in the information tray 4-(m+1) between the digit 2IC and the digit 21C'. After the light beam spot reaches position 21b, it is reversed and moved in the direction L at a relatively high speed. At this time, the light intensity of the light source is set to a relatively low constant light intensity that cannot be recorded, and the recorded information track 4-(m+1) is reproduced based on the light intensity received by the photodetector 23 to determine whether or not there is an error in the recorded content. Check. This error check is performed until the light beam spo / ) reaches position c. After reaching position 0 71c, the speed is changed to a relatively low speed similar to when moving in the F direction. If it is determined that there is an error as a result of the error check, the intensity of the light beam spot S2 is increased while the light beam spot is at the position ld-e of the information track end, and an error mark 34 is placed on the light beam spot S2.
Record. Of course, the position of the error mark is the same as the position of the error mark 9 on the recorded information track. On the other hand, if it is determined that there is no error as a result of the error check, no error mark is recorded.

If information is to be recorded subsequently, the optical beam spot can be moved by one track pitch by moving the optical head, and the same procedure can be performed. continues and records the same information as the previous one on the next information track.

After recording on the information track as described above,
Directory information indicating the logical track number of the information track on which the recording was performed and the contents of the recorded information is added to the directory.

When reproducing information, the target information track is accessed in the same way as when recording.

FIG. 15 is a diagram showing the relationship between the light beam spot and the track during reproduction. The light beam spot S1.33 covers the tracking tracks 5-p and 5-(p+1), respectively, and the light beam spot S1.32 covers the recorded information track 4-P (here, P≦m).

The reproduced data information is transferred from the MPU 10 to the CPU 50.

In the above embodiment, an example was shown in which access is performed after returning the -H light beam spot to the home position prior to recording and reproducing information, but the recording or reproducing operation may be continued after recording or reproducing. If so, the desired information track can then be accessed immediately. That is, since the logical track number where the light beam spot exists before movement is known,
The logical track number after movement is detected by counting the tracking tracks and error marks passed by the movement of the light beam spot and adding or subtracting these numbers. This allows faster access to the target information track.

[Effects of IJI] According to the present invention as described above, a desired information track can be accessed at high speed while moving the recording/reproducing means relative to the information recording medium only in the direction across the information track. Therefore, it is possible to improve the information recording and reproducing speed.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an optical card used in implementing the information recording/reproducing method according to the present invention, and FIG. 2 is a partially enlarged view thereof. FIG. 3 is a block diagram schematically showing the configuration of an embodiment of the information recording/reproducing apparatus according to the present invention, FIG. 4 is a perspective view showing details of the optical head portion thereof, and FIG. It is a diagram showing the configuration of the container, and FIGS. 6(A), (B), and (C
) are a side view, a top view, and a front view showing essential parts of the optical card transport mechanism. FIG. 7 is a diagram showing signals output from the light receiving element. FIG. 8 is a diagram showing signals obtained from the photodetector. FIG. 9 is a partially enlarged schematic diagram of the optical card. FIG. 10 is a diagram showing the output of the photodetector. FIG. 11 is a diagram showing the relationship between the light beam spot and the track during recording. FIG. 12 is a diagram for explaining the operation during information recording. FIG. 13(A) is a diagram showing changes in the moving speed of the light beam spot, and FIG. 13(B) is a diagram showing the remaining recording timing due to the movement. FIG. 14 is a flow diagram illustrating operations during information recording. FIG. 15 is a diagram showing the relationship between the light beam spot and the track during reproduction. FIG. 16 is a schematic bottom view of a write-once optical card, and FIG. 17 is a partially enlarged view thereof. 1: Optical card. 4: Information track, 5 Ni tracking track, 9.34: Error mark. 17: Light beam irradiation optical system, 18: Optical head. 22.23,24: Photodetector. Agent Patent Attorney Minoru Yamashita Figure 1 f9h Figure 2 Figure 3 7th f Qh Figure 8 Figure 9 □ Figure 1Q Figure 11 Figure 1+F Figure 15-1 F Figure 12 Figure 13 Figure group j 4[5ff Figure 14

Claims (8)

[Claims] (1) A plurality of information tracks and a plurality of tracking tracks are arranged in parallel, and if there is an error in the recorded information of the information track corresponding to each recorded information track, an error mark is recorded. In a method for recording information on an information recording medium and/or reproducing already recorded information on the information recording medium, the tracking track and the An information recording and reproducing method characterized by detecting error marks, counting the number of valid information tracks passed based on the number of detected error marks, and accessing a target information track. (2) A patent for recording information on an unrecorded information track of an information recording medium, then reproducing the recorded information to check for errors, and if there is an error, recording an error mark corresponding to the information track. An information recording and reproducing method according to claim 1. (3) The information recording and reproducing method according to claim 1, wherein the information recording medium is an optical information recording medium. (4) The information recording and reproducing method according to claim 3, wherein the optical information recording medium is an optical card. (5) A plurality of information tracks and a plurality of tracking tracks are arranged in parallel, and if there is an error in the recorded information of the information track corresponding to each recorded information track, an error mark is recorded. In an apparatus for recording information on an information recording medium and/or reproducing previously recorded information on the information recording medium, there is provided a means for detecting a tracking track and an error mark, and a means for detecting the number of tracking tracks and error marks. 1. An information recording and reproducing device, comprising: means for counting. (6) The information recording and reproducing apparatus according to claim 5, comprising means for performing an error check by reproducing information recorded on an unrecorded information track of an information recording medium, and means for recording an error mark. (7) The information recording and reproducing apparatus according to claim 5, wherein the information recording medium is an optical information recording medium. (8) The information recording and reproducing device according to claim 7, wherein the optical information recording medium is an optical card.