JPS63204567A - Method and device for recording and reproducing information - Google Patents

Abstract

PURPOSE:To increase information recording and reproducing speed by detecting an no-error mark while moving a recording and reproducing means in a direction intersecting an information track and accessing an objective information track. CONSTITUTION:A recording and reproducing device 19 moves an optical card in an F direction immediately after commanding an objective track number and moves an optical beam spot to a position corresponding to a no-error mark 9. Then, an optical head 18 is moved in a D direction by a driving motor 13, an 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 no-error 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, a large number of information tracks 2 extending in the direction of the LF force are arranged in parallel on the information recording surface of the optical card l. 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.・
...is arranged. There are two types of information tracks 2: 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 "unrecorded information tracks"). be. 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) to control the optical beam spot so as not to deviate from a predetermined information track during scanning of the light 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 reach the peak.

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 object, a plurality of information tracks are arranged in parallel, and the information track of the information track is arranged in parallel in accordance with each recorded information track. In a method for recording new information on an information recording medium on which an error-free mark is recorded when there is no error in the recorded information and/or reproducing existing Q information on the information recording medium, the recording/reproducing means The method is characterized in that the error-free mark is detected while moving relative to the 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, and the target information track is accessed. Information recording and reproducing method, and an information recording in which a plurality of information tracks are arranged in parallel and an error-free mark is recorded if the recorded information of the information track is error-free, corresponding to each recorded information track. In an apparatus for recording new information on a medium and/or reproducing previously recorded information on the information recording medium, there is provided a means for detecting an error-free mark recorded on an information recording medium, and a means for detecting the number of detected error-free marks. An information recording and reproducing apparatus is provided, characterized in that it has a counting means.

[Example] A specific example of the present invention will be described below with reference to one drawing.

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, on the information recording surface of the optical card 1, a large number of information tracks 4 extending in the direction of the LF force are arranged in parallel, and a home position, which serves as a reference position for accessing the information tracks 4, is arranged in parallel. 3 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. e*・*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, on the side opposite to the tracking track 5-n adjacent to the tracking track 5-(n+1) is a tracking track 5-(n+2) for guarding.

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

:jS2[ffl shows a partially enlarged view of the optical card 1A.

As shown in FIG. 2, a G mark 7 is recorded in advance on the information track 4-0. The G mark is to indicate that the information track is the reference track, so the information track 4-O is 2! li quasi-track. The reference track has a pattern 8 for identifying the recording medium.
is recorded.

The recording medium identification pattern indicates the type of optical card, and indicates information regarding the optical card such as the modulation/demodulation method, data capacity per information track, and 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. An error-free mark 9 is placed on the extension of the end of each recorded information track in the L direction if there is no error in the information recorded on the information track. The error-free 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 when there is no error, the mark is recorded at a predetermined position using a light beam spot. It is something. In the case of FIG. 1, since no error mark corresponding to information track 4-2 is attached, information track 4
There is an error in the information recorded in -2.

As shown in FIG. 1, a G mark 7' is also recorded on the information track 4-(m+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)+...φ.

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/reproducing apparatus according to the present invention for recording information on the optical card 1 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 apparatus 19, 14 introduces the optical card 1 into the recording and reproducing apparatus 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 from the apparatus. 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 l 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. 15 designates a part of the light beam irradiation optical system 17 as 1i!
l move to focus the light beam spot on the optical card surface6.
An AF actuator 16 moves a part of the light beam irradiation optical system 17 in the Z direction, that is, in a direction perpendicular to the optical card surface to perform autofocusing (AF). Move the light beam spot in the Y direction (
That is, it is an AT actuator for performing AT by moving in a direction perpendicular to both the R direction and the Z direction.

The light beam irradiation optical system 17, photodetectors 22 to 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 MPU10. Further, the modulation/demodulation circuit 12 modulates the information signal sent from the MPUI O,
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 optical ridge distribution by a light beam shaping prism, and then enters the diffraction grating 30, where the diffraction grating forms three effective light beams (0th-order diffracted light and ±1st-order diffracted light). divided into These three light beams then enter the beam splitter 20, pass straight through, are reflected by the reflection prism 25, enter the objective lens 26, pass through this, and are focused onto the optical card 1. Three minute light beams 2) 31 (corresponding to +1st order diffracted light), 32 (
(corresponding to the O-order diffracted light), 53 (corresponding to the -1st-order diffracted light).

The light beam spots 31, 33 are located on adjacent trough kink tracks 5, and the light beam spot S2 is located on the information track 4 between the tracking tracks.

Thus, the reflected light from the light beam spot formed on the optical card passes through the objective lens 26 and becomes substantially parallel 5.
The light is reflected by the reflection prism 25, further reflected by the beam splitter 20, and focused by the focusing lens system 21, and then enters the photodetectors 22, 23, and 24.

FIG. 5 is a diagram showing the configuration of the photodetectors 22-24. 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/unloading roller, which receives 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. , and moves the optical card 1 in the L direction toward the recording/reproducing position. The movement status of the optical card l 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 roller 35 shown in FIG. 6 is driven and rotated to move the optical card 1 in the L direction.

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 2if (i.e., the tip of the optical card) shown in FIG. That is, when the small hole 40) is 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 move the roller 35
is reversed, the optical card 1 is ejected from the recording/reproducing device, and a lamp, buzzer, or other means is used to warn the operator to this effect and urge him or her to insert the optical card in the correct posture.

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

Next, the optical head 18 is moved in the direction D by the drive motor 13 in order to access the reference track 4-0 using the optical beam spot. 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, an interval j appears until the tracking track 5-0 is detected, but when the G mark 7 is detected, the comparison A 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 1 in the direction F, and the light beam spot S
After the reflected light from 2 is received by the photodetector 23 and a no-error mark is detected, the optical card 1 is moved in the direction of L to reproduce the recorded information, and the recording medium identification pattern 8 is read by the reproduction. , determines whether the optical card recorded in the ROM in the MPU10 is applicable to the present apparatus, and sends the result 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 temporarily moved to the outside of the tracking track 5-(n+2), and then the light beam spot 32 is moved in the opposite direction to D. hand,
The reference track 4-(n+1) is accessed in the same manner as the access to the reference track 4-0.

Then, in the same manner, the directory information that is the recorded information of the information track is read out, and the RA in the MPU 10
Record in M. Thereafter, the light beam spot is returned to home position 3.

Next, when recording information, a recording command signal is input from the CPU 50 to the MPU10 of the recording/reproducing device, 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 and number are the tracks with errors among the recorded information tracks (i.e.,
The error-free marks 9 are marked sequentially from the reference track 4-0, except for the information track (to which no error-free mark 9 is marked).

Immediately after receiving the track number command, the recording/reproducing device side moves the optical card 1 in the direction of a predetermined distance F, and moves the light beam spot to a position corresponding to the error-free 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 l in the direction D. and,
At this time, the photodetector 23 detects the reflected light from the light beam spot S2 and counts the number of error-free marks.

FIG. 9 shows a partially enlarged schematic diagram of the optical card l.

As shown in the figure, since the recorded information track 4-2 is a track with an error, no error-free mark 9 is attached. FIG. 10 shows the photodetector 23 when counting the error-free mark due to the above movement. FIG. b-e in this figure corresponds to part bwe in FIG. 9 above. Since the signal appears every time there is a no-error mark 9, the logical track number can be immediately detected by counting the signal. Thus, the information track 4 immediately before the target information track 4-(m+1)
-m can be immediately accessed, and then by moving the light beam spot by one track pitch, the target information track can be easily accessed.

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. Light Beam Subbot) 31. S3 are tracking tracks 5-(m+1) and 5-(m+2), respectively.
The reflected light of the light beam spot is detected by photodetectors 22 and 24, respectively, and the AT actuator 16 is driven so that the amounts of received light are equal, thereby performing AT. In addition, the light beam sub-board) S2 is the information track 4-
(m+1), and as the optical card moves, information beams 31 are recorded using modulated light.Also, the reflected light from the light beam 32 is detected by a 4-split photodetector 23, and each divided portion is AF is performed by driving the AF actuator 15 so that the amount of light received is 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. FIG. ) is a diagram showing the recording timing accompanying the movement. Further, FIG. 14 is a flow diagram illustrating operations during information recording.

After accessing the target information track, move the optical card L in the direction of L and move the optical beam (S2) to position 1.
The optical card is moved from a toward F at a relatively low speed on the optical card. At this time, information is recorded on the information track 4-(m+1) between position f2tc and position c'.

After the light beam spot reaches the position, it is reversed and moved in the direction L at a relatively high speed. In this case, the relatively low constant light 9 which cannot record the light intensity of the light source:
Then, the recorded information track 4-(m+1) is reproduced based on the amount of light received by the photodetector 23, and it is checked whether or not there is an error in the recorded content. This error check is performed until the light beam spawn/ ) reaches position C. After reaching the 0 position C, the speed is changed to a relatively low speed similar to when moving in the F direction. And as a result of error checking,
If it is determined that there is no error, the intensity of the light beam spot S2 is increased while the light beam spot is at position d-e on the extension of the information track to record the no-error mark 34. Of course, the position of the error-free mark is the same as the position of the error-free mark 9 on the recorded information track. On the other hand, if it is determined that there is an 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 spots S1 and S3 cover the tracking tracks 5-P and 5-(p+1), respectively, and the light beam spot S2 covers the recorded information track 4-p (here, 26 m).

The reproduced data information is transferred from MPU10 to CPU50.

In the above embodiments, an example was shown in which access is performed after the light beam spot is returned to the home position before recording or reproducing information, but in the case where the recording or reproducing operation is continued after recording or reproducing. You can then immediately access the desired information track. 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 error-free marks passed by the movement of the light beam spot and adding or subtracting the number. According to this, it is possible to access the target information track more quickly.

[Effects of the Invention] According to the present invention as described above, it is possible to access a desired information track 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 important 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 schematic diagram 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 a photodetector, and FIGS. 6(A), (B), (
C:) is a side view, a top view, and a front view showing the main parts of the 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. 1O 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 recording timing accompanying 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 plan view of a write-once optical card, and FIG. 17 is a partially enlarged view thereof. 1: Optical card, 4: Information track, 5 Tracking track, 9.34: No error mark, 17: Light beam irradiation optical system, 18: Optical head, 22, 23, 24: Photodetector. Agent Patent Attorney Minoru Yamashita Children Figure 1 l Figure 2 Figure 1 j Figure 3 Figure 6 (C) (B) f 9h Figure 9 Figure 10 cde ND Figure 11 11-F Figure 15 1 -F Fig. 12 L← →F Fig. 13 W'Ilripie'5 Fig. 16 -1 -〒-F Fig. 17

Claims (8)

[Claims] (1) If multiple information tracks are arranged in parallel and there is no error in the recorded information of the information track corresponding to each recorded information track, a new information recording medium is recorded with an error-free mark. A method for recording information and/or reproducing previously recorded information on the information recording medium,
To access a target information track by detecting error-free marks while moving the recording/reproducing means relative to the information recording medium only in a direction across the information track, and counting the number of valid information tracks passed by the number of detected marks. An information recording and reproducing method characterized by: (2) After newly recording information on an unrecorded information track of an information recording medium, play back the recorded information and perform an error check, and if there is no error, record a no-error mark corresponding to the information track. , claim 1
Information recording and reproducing method in section. (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) If a plurality of information tracks are arranged in parallel and the recorded information of the information track is error-free, a new error mark is recorded on the information recording medium corresponding to each recorded information track. In a device for recording information and/or reproducing previously recorded information on the information recording medium,
An information recording and reproducing apparatus comprising: means for detecting error-free marks recorded on an information recording medium; and means for counting the number of detected error-free marks. (6) Information recording and reproducing according to claim 5, comprising means for performing an error check by reproducing newly recorded information on an unrecorded information track of an information recording medium, and means for recording an error-free mark. Device. (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.