JPH02249181A - Recording and/or reproducing device for card type recording medium - Google Patents

Abstract

PURPOSE:To always and accurately record or reproduce information by performing position control on a record/reproduce head based on the position change of a track measured from the information obtained from a medium on recording and reproduction. CONSTITUTION:The position of a card 1 being moved reciprocally is detected by a card scale 3, and a card scale signal 4 is supplied to a position change detection circuit 5. Also, an optical pickup 6 is moved in a direction intersecting orthogonally to the reciprocal moving direction of the optical card 1 by a head driving motor 7, and a moving position is detected by a head scale 8, and a head scale signal 9 is supplied to a head control circuit 10 and the position change detection circuit 5, respectively. Also, at a demodulation circuit 12, the information included in reflected light from the optical card 1 is demodulated, and track address information 13 is supplied to the position change detection circuit 5. The position change detection circuit 5 generates a control signal 14 based on inputted card scale signal 4, head scale signal 9, and track address information 13, and supplies it to the head control circuit 10. In such a way, it is possible to accurately perform the recording/reproduction of the information.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording and/or reproducing device for a card-shaped recording medium.

[Conventional technology]

As a conventional information recording and reproducing device, for example, Japanese Patent Application Laid-Open No. 60-1
As disclosed in Japanese Patent No. 5872, when recording and reproducing information, a position error signal of the head with respect to the track is detected based on position reference information read from the recording section of the disk, and this position error signal and the disk are 1 corresponding to the disk position based on the double integral signal of the drive current of the actuator that drives the head in the direction across the track of
- There is a system in which a target position signal indicating the expected position of the rank is created and the actuator is positioned and controlled using this signal.

[Problem to be solved by the invention]

However, in the above-mentioned conventional information recording and reproducing apparatus, the target position signal indicating the expected position of the trunk according to the position of the disk is based on the head position error signal and the double integral signal of the actuator drive current. Since the head is created using a servo system, its accuracy is insufficient, making it impossible to accurately position the head on the track at the target position.This makes it impossible to perform accurate track following servo, making it impossible to accurately record/reproduce information. There is a problem.

Therefore, when such a track following servo is applied to a recording and/or reproducing apparatus for a card-shaped recording medium such as an optical card, a similar problem will occur.

The present invention has been made in view of the above-mentioned conventional problems, and is a card-shaped recording medium that is appropriately configured so that the recording/reproducing head can accurately follow the track, and therefore information can be recorded or reproduced accurately at all times. The purpose of the present invention is to provide a recording and/or reproducing device for.

[Means and operations for solving the problem] In order to achieve the above object, the present invention provides a card-like recording medium and a recording/recording medium.
Recording and/or reproducing information on a card-shaped recording medium by moving the reproducing head back and forth relative to the reproducing head.
Alternatively, in the reproducing apparatus, a driving means for driving the recording/reproducing head in a direction orthogonal to a direction of relative reciprocating movement with the card-shaped recording medium; relative position detection means for detecting the relative position with respect to the reproducing head; and a position change of the track of the card-shaped recording medium in the driving direction of the recording/reproducing head by the driving means, based on information from the card-shaped recording medium. a position change measuring means for measuring and storing the measured value in advance in accordance with the relative position based on the relative position, and when recording or reproducing the card-shaped recording medium, the The driving means is controlled by reading the positional change of the track from the positional change measuring means.

〔Example〕

FIG. 1 shows a first embodiment of the invention. In this embodiment, an optical card 1 is used as the card-shaped recording medium. The optical card 1 is caused to reciprocate approximately in the track direction (longitudinal direction of the card) by the card drive unit 2, and the card position is detected by the card scale 3, and the output, that is, the card scale signal 4, is detected as the position. The signal is supplied to the change detection circuit 5.

Further, an optical pickup 6 as a recording/reproducing head that irradiates the optical card 1 with a recording or reproducing light beam is moved by a head drive motor 7 in a direction perpendicular to the reciprocating direction of the optical card 1 (card width direction). The moving position is detected by the head scale 8, and its output, that is, the head scale signal 9, is supplied to the head control circuit 1o and the position change detection circuit 5, respectively.

On the other hand, in the optical pickup 6, the output of a detector (not shown) that receives reflected light from the optical card 1 is supplied to a tracking servo circuit 11 and a demodulation circuit 12, respectively, and a tracking error detected in the tracking servo circuit 11 is detected. The signal causes the objective lens (not shown) that irradiates the optical card 1 with a light beam to be slightly displaced in a direction substantially perpendicular to the track, and the information contained in the reflected light from the optical card 1 is transferred to the demodulation circuit 12. The track address information 13 is demodulated and supplied to the position change detection circuit 5.

The position change detection circuit 5 receives a manually inputted card scale signal 4.
, head scale signal 9 and track address information 1
3, the control signal 14 is generated based on the head control circuit 1.
Further, the head control circuit 10 controls the drive of the head drive motor 7 based on the input head scale signal 9 and control signal 14.

In this embodiment, the optical card] has a plurality of tracks 15 at both ends thereof parallel to each other, as shown in FIG. 2, for example.
A device having ten copies 16A and 16B in which track address information and the like corresponding to each track are recorded is used.

FIG. 3 shows the configuration of an example of the position change detection circuit 5 shown in FIG. 1. In FIG. This position change detection circuit 5
address registers 21A, 21B.

It has an interpolation circuit 22, a memory 23, a current position register 24, a target position register 25, a difference detection circuit 26, and a D/A converter 27. The track address registers 218 and 21B are used by the demodulation circuit 12 in the position change measurement operation.
The outputs of these registers 21A and 21B are supplied to the interpolation circuit 22, where the difference (distance) between these track addresses and the card scale are stored. Track position changes corresponding to card scale signal 4 are determined by interpolation based on the card movement distance between ID parts 166 and 16B obtained from signal 4, and these are stored in memory 23 in correspondence with card scale signal 4. do it like this. The track position change data stored in this memory 23 is read out in accordance with the card scale signal 4 during recording/reproducing operations, is supplied to the target position register 25, is added to a reference value, and the output of this register 25 is calculated by calculating the difference. The signal is supplied to the detection circuit 26. In addition, the head scale signal 9 output from the Ghent scale 8 is used for recording/
During the reproduction operation, the current position register 24 is supplied, and the output of this register 24 is supplied to the difference detection circuit 26. The difference detection circuit 26 detects the difference between the output of the current position register 24 and the output of the target position register 25, and supplies this to the D/A converter 27 to obtain the control signal 14.

Note that at the start of the recording/reproducing operation, the output of the current position register 24 is supplied as a reference value to the target position register 25 and stored therein.

In this embodiment, prior to the recording/reproducing operation on the optical card 1, the optical pickup 6 is operated by the head drive motor 7.
A position change measurement operation is performed to measure the position change of the track of the optical card 1 in the moving direction of the optical card 1, and the drive of the optical pickup 6 by the head drive motor 7 during recording/reproducing operation is performed based on the position change information obtained in this operation. Control.

The position change measuring operation and recording/reproducing operation will be described in more detail below.

<Position Change Measuring Operation> This operation measures the position change of the track 15 of the optical card 1 in the moving direction of the optical pickup 6 by the head drive motor 7, and fixes the optical pickup 6 at a predetermined position, for example, the home position. In this state, the optical card 1 is moved by the card drive unit 2 to read the track addresses of the 10 parts 16A and 16B, and the change (distance) of those track addresses and the 10 parts 16A, 1
The position change for each card movement position is determined by interpolation from the relationship between the track address recording positions of 6B and the distance. Note that the optical pickup 6 can be fixed at the home position by a mechanical fixing method using a stopper or the like, or an electrical fixing method using a positioning servo using a sensor or the like.

First, fix the optical pickup 6 at the home position,
The optical card 1 is moved while operating the tracking servo circuit 11, thereby scanning one of the ten sections 16A, and supplying the track address from the demodulation circuit 12 to the track address register 21A of the position change detection circuit 5 and storing it. . Immediately after the light beam passes through the ID section 16^,
The tracking servo circuit 11 is made inactive. This causes the light beam to return to the origin position shown by the broken line in FIG. Thereafter, just before the light beam reaches the other tenth part 16B, the tracking servo circuit 11 is activated again to scan the tenth part 16B, and the track address at that time is sent from the demodulation circuit 12 to the track address of the position change detection circuit 5. It is supplied to the register 21B and stored therein.

After obtaining the track addresses in the 10 parts 16A and 16B as described above, the changes in these track addresses and the 10 parts 1 obtained from the card scale signal 4 are calculated.
Based on the card movement distance between 68 and 16B, the interpolation circuit 12 calculates a change in the position of the track 15 for each card movement position, and stores this in the memory 23. In addition,
In this case, the card movement distance is shown in FIG.
10 parts from the left end of the trunk address recording section to 6 16B
This is the distance to the left edge of the green section of the track address.

<Recording/Reproducing Operation> In recording/reproducing operation, the optical pickup 6 is connected to the head scale 8, the current position register 24, and the difference detection circuit 26.
, the D/A converter 27, the head control circuit 10, and the head drive motor 7 to control the positioning to a desired track.

First, at the start of a recording/reproducing operation, the optical pickup 6 is located at either the left or right end of the optical card 1, and the contents of the current position register 24 of the position change detection circuit 5 and the target position register 25 are read. It has the same value as the contents of . After that, optical card 1 is inserted for recording or playback.
With the movement, corresponding position change data is read out from the memory 23 using the card scale signal 4 and is supplied to the target position register 25. The target position register 25 adds the device change data stored in the memory 23 to a pre-stored reference value (record/playback start point position data) and supplies it to the difference detection circuit 26, where the data from the current position register 24 is added. The difference from the head scale signal 9 indicating the current position of the supplied optical pickup 6 is detected and supplied to the head control circuit 10 via the D/^ converter 27 as a control signal 14.

As a result, the optical pickup 6 is moved by the position change data from the memory 23 via the head drive motor 7 so that the contents of the current position register 24 and the contents of the target position register 25 match.

As a result, the optical pickup 6 is positioned according to the trunk position change for each card movement position stored in the memory 23 so that the optical beam is always positioned on the desired track at the start of recording/playback. .

In addition, in this embodiment, 10
Although the reading direction of the track address of the portion 16B is the same as the reading direction of the ID portion 16, the track address of the tenth portion 16B can also be read by moving the optical card 1 in the opposite direction. In this case, the card movement distance based on the card scale signal 4 between 10 parts 16A and 16B is the distance from the left end of the track address recording part of 10 parts 16A to the right end of the track address recording part of 10 parts 16B in FIG. becomes.

FIG. 4 shows a second embodiment of the invention. In this embodiment, while moving the optical card 1 at a constant speed, the light beam is directed in a direction perpendicular to the direction of card movement (tracking direction).
The direction difference between the card movement direction and the track direction is detected from the period of light intensity change due to track crossing in the reflected light, and the card movement is determined based on the direction difference and the card movement distance for each detection time. It is designed to measure the change in track position for each position, and the same reference numerals as those shown in FIG. 1 represent the same functions.

Therefore, in this embodiment, a light beam vibration circuit 31 is provided, and the light beam vibration circuit 31 detects the card scale signal 4 from the card scale 3 and the position of the objective lens provided in the optical pickup 6 in the tracking direction. A vibration signal 33 for driving the objective lens and vibrating the light beam in the tracking direction based on the card scale signal 4 is supplied. At the same time, the amplitude of the vibration signal 33 is converted into a lens position signal 3.
2, it is controlled to be constant.

Vibration signal 33 output from this light beam vibration circuit 31
is supplied to the tracking servo circuit 11 to drive the objective lens so that the light beam vibrates in the i-racking direction via the tracking servo circuit 11, and is also supplied to the position change detection circuit 34. . Also,
The reflected signal 35 from the optical card 1, which is supplied from the detector of the optical pickup 6 to the tracking servo circuit 11, is also supplied to the position change detection circuit 34, where the card scale signal 4 is detected by the position change measurement operation. , the head scale signal 9, the vibration signal 33, and the reflection signal 35 to measure and store the track position change for each card movement position, and in the recording/reproduction operation, based on the measured position change for each card movement position. A control signal 47 is supplied to the head control circuit IO.

FIG. 5 shows the configuration of an example of the position change detection circuit 34 shown in FIG. 4. This position change detection circuit 34 includes a binarization circuit 40, a measurement circuit 4I, a conversion circuit 42, and a memory 4.
3. Arithmetic circuit 44, counter 45 and D/A converter 4
It has 6. The binarization circuit 40 binarizes the reflected signal 35 from the optical pickup 6 during the position change measurement operation, and its output is supplied to the measurement circuit 41, where the vibration signal 33 from the light beam vibration circuit 31 is output. The period will be measured in synchronization with the The output of this measuring circuit 41 is supplied to a conversion circuit 42, where it is converted into a position change amount based on the card scale signal 4, and this is stored in the memory 43 in correspondence with the card scale signal 4. The track position change data stored in the memory 43 is read out in accordance with the card scale signal 4 during recording/reproducing operations, and is supplied to the arithmetic circuit 44, where the counter 45
The next position signal 49 is obtained by subtracting the amount of position change from the output 48 of
is obtained and supplied to the counter 45.

On the other hand, the counter 45 counts the head scale signal 9 during the recording/reproducing operation, and also uses the load signal 50 output from the arithmetic circuit 44 after the subtraction is completed to load the next position signal 49 and add it to the count value. The output 48 is supplied to the arithmetic circuit 44, and the D/
It is supplied to the head control circuit 10 as a control signal 47 via a converter 46.

The following describes the position change measurement operation and recording/recording according to this embodiment.
The playback operation will be explained.

Position Change Measuring Operation> In this operation, the optical card 1 is moved by the card drive unit 2 with the optical pickup 6 fixed at the home position, and the card scale signal 4 from the card scale 3 accompanying the movement is The objective lens is driven via the tracking servo circuit 11 by the vibration signal 33 created by the light beam vibration circuit 3I with reference to the vibration signal 31, and the light beam is vibrated in the tracking direction.

FIG. 6 shows the relationship between the optical spot 51, the track 15, and the card moving direction 52 in this case. In this case, assuming that the optical card 1 is moving at a constant speed,
The light spot 51 moves as the card moves. , f+, f
It moves as z, ..., flO+ .... Here, 1
- When the direction of the rack 15 and the card movement direction 52 match, the amount of reflected light changes at a constant period (1) as shown in FIG. 7A. On the other hand, when the direction of the track 15 and the card movement direction 52 do not match as shown in FIG. 6, the change in the amount of reflected light is as shown in FIG.
As shown in , the periodic change (t
lt 2 ). Therefore, the seventh
Comparing the cycle (1) in Figure A with the actual cycle (tI or tz) at each card movement position in Figure 7B, the difference between the direction of the track 15 and the card movement direction 52 at that position can be found. (intersecting angle) is obtained, and based on the difference and the half-cycle movement amount of the light spot 51, data on the track position change for each half-cycle (fo=f1.f+o-f+9) of the light spot vibration is obtained. becomes possible.

Therefore, in this embodiment, the reflected signal 35 from the optical pickup 6 is supplied to the binarization circuit 40 of the position change detection circuit 34 and binarized as shown in FIG. 7C, and the binarized signal is measured. It is supplied to a circuit 41 to measure its period in synchronization with the vibration signal 33 from the light beam vibration circuit 31, and is supplied to a conversion circuit 42. In the conversion circuit 42, the measurement circuit 41
The output is converted into a position change amount according to the card movement speed obtained from the card scale signal 4, and this is stored in the memory 43 in correspondence with the card movement position.

In other words, in this position change measurement operation, FIG.
While the light spot is moved from position 55 to position 56 on the optical card 1 as shown in FIG. 2, for example from the left end of the ID section 16A to the right end of the ID section 16B in FIG. 33, the card is vibrated in a direction perpendicular to the direction of card movement, and every half period of the vibration (j2+,
42z,...,L) as shown in Fig. 8C, and measure the positional change amount (f+%!2+..., 17), which corresponds to the card movement position as shown in Fig. 8. and memory 4
Store in 3.

<Recording/Reproducing Operation> In recording/reproducing operation, the optical pickup 6 is positioned on a desired track by the lure of the head scale 8, counter 45, D/A converter 46, head control circuit 10, and head drive morph 7. Control.

That is, in this recording/reproducing operation, the amount of change in position of the corresponding card movement position is read out from the memory 43 using the card scale signal 4 that changes with the movement of the card, and is supplied to the arithmetic circuit 44, where it is calculated from the output 48 of the counter 45. The amount of position change is subtracted, and the result is supplied to the counter 45 as the next position signal 49.

Further, the counter 45 counts the head scale signal 9 and supplies its output 48 to the arithmetic circuit 44 and the D/A converter 46, and also uses the load signal 50 outputted from the arithmetic circuit 44 after the subtraction to generate the next position signal 49. Load. As a result, the optical pickup 6 is positioned at a position where the counter 45 is added by the amount of position change through the head scale signal 9. By repeating this operation as the optical card 1 moves, the optical pink-up 6 is positioned at a position where the measured position change amount is accumulated as shown in FIG. It will always be located on the desired track at the start.

In this embodiment, in order to measure the change in the position of the track, the reflected signal 35 is binarized by the binarization circuit 40, and its period is measured by the measurement circuit 41 according to the vibration of the light beam. As shown in FIG. 9, the reflected signal 35 is frequency-detected by the F1 signal wave circuit 60 to obtain a signal whose amplitude changes according to the difference between the track direction and the card movement direction as shown in FIG. A sample/bold circuit 61 samples and holds the vibration signal 33 in synchronization with the vibration signal 33, and the output thereof is converted into a digital signal by an A/D converter 62 and converted to a conversion circuit 4 in the same manner as in FIG.
2, it can also be calculated by converting it into a position change amount based on the card scale signal 4.

〔Effect of the invention〕

As described above, according to the present invention, when recording/reproducing,
The position of the playback head is controlled based on changes in track position measured based on information from the medium.
The difference between the position at which the recording/reproducing head is positioned and the position of the track that actually changes as the medium moves becomes smaller, allowing the recording/reproducing head to follow the track more accurately.

Therefore, information can always be accurately recorded or reproduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a diagram showing an example of the optical card shown in FIG. 1, and FIG. 3 is a block diagram showing the configuration of an example of the position change detection circuit. , FIG. 4 is a block diagram showing a second embodiment of the present invention, FIG. 5 is a block diagram showing the configuration of an example of the position change detection circuit shown in FIG. 4, FIGS. 6, 7 A-D, and 8A to 8E are diagrams for explaining the operation of the embodiment shown in FIG. 4, and FIG. 9 is a block diagram showing the configuration of another example of the position change detection circuit shown in FIG. 4. 1... Optical card 2... Card drive unit 3.
...Card scale 5...Position change detection circuit 6.
・・Optical pickup 7・・Head drive motor 8・
...Head scale 10...Head control circuit 11
... Tracking servo circuit 12 ... Demodulation circuit 15 ... Trunk 16
8. 16B...10 copies

Claims (1)

[Scope of Claims] 1. A recording and/or reproducing device for a card-shaped recording medium that records and/or reproduces information by relatively reciprocating a card-shaped recording medium and a recording/reproducing head, comprising the steps of: / A driving means for driving a reproducing head in a direction perpendicular to a direction of relative reciprocating movement with the card-shaped recording medium; and a relative position of the card-shaped recording medium and the recording/reproducing head in the relative reciprocating direction. a relative position detection means for detecting a change in the position of a track of the card-shaped recording medium in the driving direction of the recording/reproducing head by the driving means, based on information from the card-shaped recording medium; a position change measuring means for measuring and storing a corresponding measurement in advance, and when recording or reproducing the card-shaped recording medium, the position change measuring means detects the track according to the relative position from the relative position detecting means. 1. A recording and/or reproducing device for a card-shaped recording medium, characterized in that the device is configured to control the driving means by reading a change in position of the card.