JPH0689435A - Optical card information recording and reproducing device - Google Patents

Abstract

PURPOSE:To enhance processing efficiency by effectively utilizing each scan to an optical card without useless scans at the time of recording and reproducing the optical card. CONSTITUTION:The optical card information recording and reproducing device carrys out recording and reproducing to the optical card 7 arranged with an ID part including a track address at both ends of a data part in each track. A control part 77 controls reproduction of the above data part at the time of reproducing information recorded in the data part of the optical card 7 even when specifying the track address in the ID part arranged in front of this data part is ended in failure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical card information recording / reproducing apparatus for optically recording / reproducing a card-shaped recording medium.

[0002]

2. Description of the Related Art Various types of optical cards have been proposed in the past, and the present applicant has also proposed an optical card as disclosed in Japanese Patent Laid-Open No. 63-37876. This optical card is shown in FIG.

In FIG. 8, 7 is an optical card, and an optical recording section 201 having a plurality of tracks 200 parallel to each other is provided on the surface of the optical card 7, as shown in the figure. Data can be recorded by forming information pits on the track 200, and data can be reproduced by reading the information pits formed on the track 200. This is performed by scanning the track 200 with a light beam emitted from. This scanning is usually performed by repeatedly carrying and moving the optical card 7 in the track direction.

Each track 200 has ID sections 202a and 202b in which information (ID information) indicating an address corresponding to the track is recorded, and a data section 20 in which data is recorded.
3 and 3. The ID part is 202a, 2a in FIG.
As indicated by 02b, it is provided at both ends of each track 200 in the optical recording unit 201 so that the tracks can be read from mutually opposite directions.
A data section 203 is provided between the sections 202a and 202b.

Therefore, for example, in FIG. 8, when the optical card 7 is moving from left to right in the track direction with respect to the optical head, the left ID section 202a is moved, and when it is moving from right to left. By reading the ID section 202b on the right side, the track address information corresponding to the track is recognized. That is, the ID information regarding the track can be read even if the track is scanned in either the left or right scanning direction.

Incidentally, these ID sections 202a and 202b
Is a fixed distance (for example, 4 mm) from the card end in order to prevent the influence of scratches and dirt on the card end and to sufficiently stabilize the relative movement speed of the optical card 7 and the optical head in the track direction. It is provided at the inner position.

As an optical card information recording / reproducing apparatus for recording / reproducing on the optical card 7 as described above, conventionally, a single light emitted from an optical head is applied to a single track to read information. A single track read type device is generally used in which the above is performed in units of one track.

However, in such a single track read type apparatus, the reproduction speed of the information recorded on the track is determined by the relative speed between the optical head and the recording medium, and cannot be further increased. could not.

Therefore, in order to solve this drawback, an information recording / reproducing apparatus of a multi-track simultaneous read-out type is devised in which the light emitted from the optical head is applied to a plurality of tracks to simultaneously read information from the plurality of tracks. Has been done.

For example, the applicant of the present invention has filed Japanese Patent Application No. 3-1588.
In No. 24, a series of information reproducing means having an information reproducing light receiving element, a binarizing means, a bit clock generating means, a demodulating means and a storing means for one track are provided for the number of tracks to be read out at the same time, and the information from the optical card In parallel with reading the data, binarization → demodulation → memory storage can be simultaneously executed for each track, and after the optical head has passed through the data recording area, the demodulated data stored in the memory are sequentially error correction means. An optical card information recording / reproducing apparatus is proposed which is configured to perform error correction by means of an optical card and is capable of increasing the data reading speed even when the relative moving speed of the optical head and the recording medium is high. .

Needless to say, such a multi-track simultaneous read type device can also be used as a single track read type device.

By the way, in the optical card 7 shown in FIG. 8, the ID sections 202a and 202b generally have five IDs, for example, ID0 to ID4, as shown in FIG.
It has an information part, and each of these ID0 to ID4 contains the same track address information and is usually error correction coded.

In the information recording / reproducing apparatus for the optical card, erroneous recognition of the track address causes the already recorded information to be overwritten or the wrong information to be read. Therefore, it is necessary to keep the probability of erroneous recognition of the track address as low as possible. This is the reason why five ID information parts having the same content are provided in one ID part of the optical card 7, and five ID information parts ID0 to ID0 are provided.
By determining the track address based on the read result of ID4, the probability of erroneous recognition is kept low.

As described above, the optical card information recording / reproducing apparatus using the optical card 7 generally records / reproduces information by relatively reciprocating the optical card and the optical head in the track direction. I have to. An outline of the moving speed in this reciprocating motion (that is, the relative speed between the optical head and the optical card in scanning the light beam) will be described with reference to FIG.

First, the optical head is the ID section 202a of FIG.
It is located on the left side of. At point A, one scan is started, and acceleration is performed so that the relative speed (scan speed) between the optical head and the optical card is constant at a predetermined speed until the start position (point B) of the ID unit 202a is reached.

When the scan speed reaches a constant speed until the point B is reached and the ID section 202a is reached, first the ID section 202 is reached.
a is read, which confirms the track number. After that, the scanning of the data unit 203 is started, the data unit 203 is accessed, and after passing through the ID unit 202b, the deceleration for stopping the scanning motion is started, and the reciprocating motion between the optical head and the optical card is started. After the settling period from the point D to the point A'stopped, the next scan is started from the point A '.

In this manner, the optical head and the optical card are relatively reciprocated in the track direction to move the light beam irradiating the optical card along the track to record and reproduce information.

[0018]

As described above, in the conventional optical card information recording / reproducing apparatus, the ID section (ID section 202a in the example of FIG. 10) that appears immediately before accessing the data section as shown in FIG. ) Is read, the track number of the track being scanned is identified from the content, and the recording and reproduction are performed by recognizing that the subsequent data section is the area corresponding to that track number.

At this time, the contents of the plurality of ID information portions read when the ID portion is scanned are error-corrected and decoded to reproduce the track address information (track number), and the same track address information can be reproduced. When the same track address information cannot be reproduced, the data portion is not read.

That is, in the conventional device, of course, when the ID section could not be read at all due to dust or scratches,
In the ID information section provided in plural in the ID section, for example, 5
When error correction decoding can be performed only on the read content of one of the ID information parts, the data part is not reproduced because the probability of erroneous recognition of the track number is high. .

However, even in this case, the relative scan between the optical card and the optical head is the same as the normal scan shown in FIG. 10 in order to perform the next scan from the opposite direction. Then, by the next scan from the opposite side, from the right side of the optical card 7 shown in FIG.
02b is read, the track number is recognized from the contents, and if it is recognized normally, the data part is reproduced.

That is, in the information reproduction of the conventional optical card, while the normal reciprocal scanning for the track is repeated, the track number is specified from the ID part appearing prior to the reading of the data part, and the track number can be specified. Reads the next data section, and if the track number cannot be specified, or if it is determined that there is a high probability of erroneous recognition, the data section is not read, and that one scan is completely wasted. Was there.

This useless scanning leads to a reduction in data reading efficiency and access speed, and since such an optical card is a medium capable of handling a huge amount of data, such a waste hinders improvement in processing efficiency.

The present invention has been made in view of the above circumstances, and it is possible to effectively use each scan of the optical card at the time of recording / reproducing the optical card, eliminate unnecessary scans, and improve the processing efficiency. It is an object of the present invention to provide an optical card information recording / reproducing device which can be realized.

[0025]

An optical card information recording / reproducing apparatus according to the present invention has a plurality of tracks, and a data section for recording information in each track and tracks arranged at both ends of this data section. In an apparatus for recording / reproducing information by reciprocally moving the optical card and an optical head relative to an optical card provided with an ID section containing address information, the information recorded on the optical card is reproduced. When doing
Even if the identification of the track address in the ID section arranged in front of the data section fails, the control section controls the reproduction of the data section.

[0026]

When reproducing the information recorded on the track of the optical card, the control means controls the ID arranged in front of the data section.
Even if the specification of the track address in the copy fails, the data part is controlled to be reproduced.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 relate to a first embodiment of the present invention, FIG. 1 is a block diagram showing a schematic configuration of an optical card information recording / reproducing apparatus, and FIG. 2 is a configuration of an optical head provided in the optical card information recording / reproducing apparatus. FIG. 3 is an explanatory diagram showing an example of the configuration, FIG. 3 is an explanatory diagram showing the positional relationship of recording and reproducing light beam spots formed on an optical card, and FIG. 4 is a recording and reproducing light projected on a photodetector. FIG. 5 is an explanatory view showing a beam spot image, FIG. 5 is a block diagram showing a detailed configuration of the data processing circuit shown in FIG. 1, and FIG. 6 is a flowchart showing a data reproducing procedure in the first embodiment.

The data processing circuit 113 provided in the optical card information recording / reproducing apparatus shown in FIG. 1 has a control section 77. The control unit 77 controls various required controls of the entire system, and individually controls the control target elements. Further, the data processing circuit 113 is for performing writing of data and processing of read data,
The write data and the read data may be exchanged with an external host system, or may have its own input / output means.

In the optical card information recording / reproducing apparatus, a conveyor belt 110 is stretched between pulleys 112a and 112b arranged at a predetermined interval.
At a predetermined position above, a carrier table 111 for holding the optical card 7 as a recording medium is provided. This carrier 111
The optical card 7 is loaded in the.

The optical card 7 is similar to that shown in FIG. 8 and has an optical recording section 201 in which a plurality of tracks 200 are arranged, and the plurality of tracks 200 have ID sections near both ends of each track. 202a and 202b are arranged, and a data section 203 is arranged in an area sandwiched between these ID sections 202a and 202b.

A motor 109 is connected to the pulley 112a, and the pulley 112a is rotated forward and backward by controlling the motor 109 to rotate forward and backward. The forward / reverse rotation of the pulley 112a causes the transport belt 110 to be forward / backward transported, and the transport base 111 to be transportable in forward / backward directions. As a result, the optical card 7 loaded on the carrier table 111 can be repeatedly moved in the forming direction of the track 200.

An optical head 10 for irradiating a track of the optical card 7 with a light beam to record and read data.
4 is provided and the laser drive circuit 101 is connected. The laser drive circuit 101 drives a semiconductor laser that generates a light beam provided in the optical head 104, and is connected to the controller 77. The control unit 77 controls the driving of the semiconductor laser, and controls the irradiation of the optical beam from the optical head 104 onto the optical card 7. The optical head 104 is arranged at an upper position, for example, in the center of the area where the conveyor belt 110 is arranged. The optical head 104 has a motor 1
05 is connected, and by the drive of the motor 105, a direction orthogonal to the moving direction of the conveyor belt 110,
That is, the optical card 7 loaded on the carrier 111 can be moved in a direction traversing the track 200.

With such a structure, the optical card 7 can be conveyed back and forth in the track direction by the drive of the motor 109, and by the drive of the motor 105.
Since the optical head 104 is configured to reciprocate in the direction orthogonal to the tracks, the optical head 104 and the optical card 7 are moved relatively to each other, and the optical head 104 scans each track 200 of the optical card 7. Is possible.

A rotary encoder 108 is connected to the motor 109 to detect the position of the carriage 111 with respect to the optical head 104. The rotary encoder 108 generates a pulse for each predetermined rotation angle, and one pulse of the rotary encoder 108 corresponds to, for example, 50 μm of the carriage 111 with respect to the optical head 104.
It corresponds to the relative movement amount of.

A motor servo circuit 107 for controlling the motor 109 is provided and is connected to the motor 109, the rotary encoder 108, and the controller 77. The motor servo circuit 107 detects the carrying speed of the optical card 7 based on the position information from the rotary encoder 108, and controls the rotational driving of the motor 109. Here, the ID section 202 of the optical card 7 in FIG.
A control command is sent from the control unit 77 to the motor servo circuit 107 so that the conveyance speed is constant between a and 202b, and the rotational drive of the motor 109 is controlled based on this control command.

The motor 105 connected to the optical head 104 has an optical card 7 like the motor 109.
Rotary encoder 10 for detecting the position with respect to
6 is connected. These motor 105 and rotary encoder 106 are connected to the optical head drive circuit 102, and the motor 10 is driven by the optical head drive circuit 102.
The drive of 5 is controlled. The optical head drive circuit 102 is connected to the control unit 77, and a control command is sent from the control unit 77 to the optical head drive circuit 102 based on position information from the rotary encoder 106 so that the motor 105 is controlled. It has become.

In addition, the focus track servo circuit 10
3 is provided, and the optical head 104 and the control unit 77 are provided.
It is connected to the. The focus track servo circuit 103 drives the optical head 104 in the focus direction and the track direction based on the focus error signal and the track error signal generated from the reflected light of the light beam from the optical card 7 to drive the optical card 7. It operates so that the incident light always follows the target track in a focused state.

Next, a structural example of the optical head 104 used in the above-mentioned optical card information recording / reproducing apparatus and the positional relationship between the recording and reproducing light beam spots formed on the optical card 7 by the optical head 104. , Optical head 10
Spot images of recording and reproducing light beams projected on the photodetector in FIG. 4 will be described with reference to FIGS. 2 to 4.

As shown in FIG. 2, the optical head 104 is provided with a semiconductor laser 1 which is a light source for recording information. The semiconductor laser 1 is adapted to generate a laser beam in response to a drive signal from a laser drive circuit 101 that operates under the control of the control unit 77. The light beam generated by the semiconductor laser 1 becomes a substantially elliptical parallel beam by the collimator lens 2. Further, this parallel beam is shaped into a substantially circular shape by reducing only the elliptical long-axis direction component in the shaping prism 3, and then a spot size of a predetermined size is formed on the recording medium (optical card 7) by the circular diaphragm 4. The diameter of the parallel beam is narrowed so that the beam is incident on the polarization beam splitter 5.

The light beam for recording is the semiconductor laser 1
Due to the property of (1), almost all the components of the beam are reflected by the reflection surface of the polarization beam splitter 5 and are incident on the optical axis of the objective lens 6. This light beam is condensed by the objective lens 6 and is converted into an optical card 7
A circular spot is formed on the upper side, the energy density is locally increased, and the recording layer of the optical card 7 is thermally irreversibly changed to form a recording pit.

On the other hand, apart from the semiconductor laser 1, a semiconductor laser 40 is provided as a light source for reproducing information. The light beam emitted from this semiconductor laser 40 is
After passing through the collimator lens 9, it becomes a substantially elliptical parallel beam, and the shaping prism 41 expands only the component in the minor axis direction of the ellipse to shape it into a substantially circular shape. The circular beam is further narrowed by the circular diaphragm 42 so that the parallel beam diameter is narrowed so that the spot size becomes a predetermined size on the recording medium.
The light is incident on the plano-concave cylindrical lens 43.

The reproduction light beam is refracted by the plano-concave cylindrical lens 43 in only one direction in the plane perpendicular to the optical axis, and becomes a beam that diverges slightly in that direction. Further, it is split by the diffraction grating 44 into 0th-order diffracted light and two 1st-order diffracted lights. At this time, it is assumed that the plano-concave cylindrical lens 43 and the diffraction grating 44 are arranged at positions where the diverging direction of the light beam by the cylindrical lens 43 and the diffraction direction by the diffraction grating 44 are substantially orthogonal to each other.

Since the three light beams divided by the diffraction grating 44 are almost P-polarized components due to the property of the semiconductor laser 40, most of the components of the beam pass through the polarization beam splitter 5 and the objective lens 6 Incident on. This light beam is condensed by the objective lens 6 and 3
An image is formed on the optical card 7 as one spot. Since these light beam spots are originally diverged in one direction by the plano-concave cylindrical lens 43, each light beam spot is also expanded in the divergence direction and formed into an elliptical shape on the optical card 7. It will be.

The positional relationship between the recording light beam spot and the reproducing light beam spot formed on the optical card 7 is shown in FIG.

The recording light beam spot 23 is arranged so as to be located between the spot 25a formed by the 0th-order diffracted light of the reproduction light beam and either one of the spots 25b or 25c formed by the 1st-order diffracted light. The arrangement of these spots is performed by giving a relative angular difference between the optical axis of the recording light beam and the optical axis of the reproducing light beam before entering the objective lens 6 when the optical head is assembled and adjusted. adjust.
A reproduction light beam spot 25a on the optical card 7,
Since the cylindrical lens 43 is arranged so that the direction in which 25b and 25c are enlarged is substantially orthogonal to the track extending direction, the elliptical reproduction light beam spot 25
Since a, 25b, and 25c are distributed across a plurality of tracks, information of a plurality of tracks can be obtained at the same time.

Spot 2 due to the diffracted light of the reproduction light beam
5a, 25b and 25c are specularly reflected on the optical card 7 in a state in which the light quantity is modulated depending on the presence or absence of the track guide 21 and the information pit 22 on the optical card 7. These reflected lights pass through the objective lens 6 in the opposite direction and are guided to the polarization beam splitter 5 in the state of substantially parallel light. Since the reflected light is specularly reflected on the optical card 7, it almost holds the P-polarized component, and most of the component is transmitted through the polarization beam splitter 5 and guided to the reflection mirror 14. Then, after being reflected by the reflection mirror 14, it is condensed by the condenser lens 15 and further divided by the half mirror 16 to be received on the light receiving surfaces of the signal reproducing and tracking photodetectors 17 and the focusing photodetectors 18. Each is incident and the image of the spot is enlarged and projected.

At this time, the reproduction light beam is incident on the objective lens 6 at a position decentered from the optical axis, and so-called off-axis type focus detection is performed. The focusing photodetector 18 is configured, for example, by arranging a light receiving element of two divisions and detecting the movement of the image of the reproducing light beam spot due to the focus shift. As a result, a focus error signal corresponding to the focus shift is generated.

FIG. 4 shows the spot image of the recording light beam and the spot image of the diffracted light of the reproduction light beam projected on the photodetector 17 for signal reproduction and tracking.

On the photodetector 17, the light receiving elements 51, 52 and 53 for signal reproduction and the light receiving elements 61 and 6 for tracking are provided.
2, 63, 64 are arranged, and further, the magnified and projected images 25d, 25e, 25f of the optical image of the reproduction light beam are properly positioned on these light receiving elements without any track deviation and focus deviation. The signal reproducing light-receiving element 54 is provided at a position where an image 25e corresponding to the spot 25b formed by the first-order diffracted light is formed when the image is formed on.

Tracking light receiving elements 61, 62 and 6
Reference numerals 3 and 64 detect a change in the position of the image on the track guide 21 due to a track shift as a change in the amount of received light, and generate a tracking error signal. Further, the signal reproducing light-receiving elements 51, 52 or 54, and 53 are
The presence or absence of information pits for three tracks is detected by a change in the amount of light, and a reproduction signal is output.

During recording of information, when the optical card 7 is moving in the direction of arrow a (forward direction) as shown in FIG. 3, the information pit 22 formed by the recording light beam spot 23 is reproduced. When the information pit 22 reaches the position of the spot 25a by moving in the direction of the spot 25c due to one of the first-order diffracted light beams of the working light beam, the light quantity change in the signal reproducing light receiving element 52 on the photodetector 17 Since a reproduction signal is generated and a reproduction signal is output, a reproduction signal immediately after recording is obtained, and a verify operation for checking the quality of recording is performed based on this reproduction signal.

Further, the moving direction of the optical card 7 is reversed,
When moving in the direction of arrow b (reverse direction), the information pit 22 formed by the recording light beam spot 23 is formed.
Is a spot 2 due to the other first-order diffracted light of the reproduction light beam.
5b, when the information pit 22 reaches the position of the spot 25b, the signal reproducing light receiving element 54
A change in the light amount occurs in the light source, and a reproduction signal immediately after recording can be obtained from the change in the light amount, and the verify operation is performed based on the reproduction signal.

Therefore, the moving direction of the optical card 7 is the forward direction,
In either case of the reverse direction, the reproduction signal can be obtained immediately after recording. That is, regardless of the moving direction of the optical card 7 that reciprocates with respect to the optical head 104, it is possible to obtain a reproduction signal immediately after recording and perform a verify operation for checking the quality of recording.

Next, the data processing circuit 113 shown in FIG.
Will be described. FIG. 5 shows a detailed configuration of the data processing circuit 113.

In FIG. 5, reference numerals 71, 81 and 91 denote signal reproduction light receiving elements provided on the photodetector 17, and correspond to, for example, the signal reproduction light receiving elements 51, 52 and 53 in FIG.

The data processing circuit 113 is provided with I / V converters 72, 82 and 92, and outputs of the signal reproducing light-receiving elements 71, 81 and 91 are respectively I / V converters 7.
2, 82, 92 and the I / V converters 72, 8
2 and 92, light receiving elements 71, 81 and 91 for signal reproduction
The signals obtained by receiving the light are converted into current and voltage. Binarization circuits 73, 83, 93 are connected to the output terminals of the I / V converters 72, 82, 92. Two
The binarization circuits 73, 83, 93 include I / V converters 72, 8
The outputs of 2, 92 are converted into binarized signals at predetermined reference levels, and the binarized signals are demodulated by the demodulation circuits 74, 84, 9
4 and the bit clock generation circuits 75, 85 and 95, respectively.

Bit clock generation circuits 75, 85, 95
Generates a bit clock based on the binarized signals output from the corresponding binarization circuits 73, 83, 93, and supplies it to the demodulation circuits 74, 84, 94. The demodulation circuits 74, 84, 94 sample the binarized signals output from the corresponding binarization circuits 73, 83, 93 with the bit clocks from the bit clock generation circuits 75, 85, 95, and from the results. It is designed to demodulate data.

At the output terminals of the demodulation circuits 74, 84 and 94,
Memories 76, 86, 96 for storing the demodulation results output from the corresponding demodulation circuits 74, 84, 94, respectively.
Are connected. Data before error correction for each track is stored in these memories 76, 86, 96.

The memories 76, 86 and 96 are connected to a data bus 79, and on this data bus 79,
The control unit 77 and an error correction circuit (EC
C) 78 is connected. The error correction circuit 78 is adapted to perform error correction on the data stored in the memories 76, 86 and 96. The data after the error correction may be stored in the memories 76, 86 and 96 again or may be sent to the outside via the data bus 79.

Reference numeral 77 denotes the above-mentioned control unit, which includes the error correction circuit 78, the memories 76, 86, 96 and the like on the data bus 79.
Various necessary controls are performed through the
It is configured using PU.

In the case of an optical card, since one track has a capacity of about 2 kbytes with redundant bytes of error correction codes, the memories 76, 86 and 96 are SRAMs (static random access) of about 4k × 8 bits.・
It is effective in terms of cost, availability of memory elements, access speed, etc., and is the optimum choice.

Next, the operation including the data reproducing procedure in the optical card information recording / reproducing apparatus of this embodiment will be described.

When recording / reproducing data, the optical card 7 is mounted on the carrier 111, and the optical head 104 and the optical card 7 are moved relative to each other, whereby the optical head 10 is moved.
The light beam from 4 is scanned on the track to write and read data.

That is, the control section 77 calculates the amount of movement of the optical head 104 from the current position of the optical head 104 and the position of the target track, and the optical head drive circuit 102.
To the optical head 10 by driving the motor 105.
4 is moved in the direction orthogonal to the track of the optical card 7. Then, an instruction is sent to the motor servo circuit 107 to drive the motor 109 so that the carriage 111 is moved to the pulley 112a,
112b to move the optical card 7 to the optical head 1.
04 is moved in the track direction, and the target track is scanned by the light beam.

In the case of recording, the controller 77 gives a write signal modulated based on the write data to the laser drive circuit 101 to drive the recording semiconductor laser 1 of the optical head 104 to generate a recording light beam. To form the information pit 22 on the track of the optical card 7.

In the case of reproducing, the reproducing semiconductor laser 40 of the optical head 104 is driven to irradiate the reproducing light beam onto the optical card 7, and the reflected light is detected by the optical head 104 for signal reproduction. The information received by the device 17 is read according to the intensity of the reflected light. The read signal is processed by the data processing circuit 113 for each track,
The demodulated data is the memory 7 in the data processing circuit 113.
6,86,96.

At this time, focus control and tracking control are performed by a focus track actuator (not shown) provided in the focus track servo circuit 103 and the optical head 104 so that the light beam follows the target track in a focused state. To do.

The data reproducing procedure according to this embodiment will be described in detail with reference to the flowchart of FIG. The processing in FIG. 6 is all executed by the control unit 77.

The data reproducing procedure of the first embodiment shown in FIG. 6 is an example in which only one system of the data processing circuits for three tracks shown in FIG. 5 is used. In this case, it can be realized by a conventional single-track read type device that reads data in units of one track.
Here, for example, one circuit of the light receiving element 81 to the memory 86 in the data processing circuit of FIG. 5 is used.

First, in step S1 (hereinafter, steps will be omitted), the front ID section is read. The front side ID section indicates the ID section 202a when the optical head 104 scans the optical card 7 shown in FIG. 8 from left to right, and the ID section 20 when the optical head 104 scans from right to left.
Refers to 2b. Similarly, the rear ID section is the optical head 104.
Indicates the ID section 202b when scanning from left to right, and indicates the ID section 202a when the optical head 104 scans from right to left.

Then, in S2, the track number is determined from the reading result of the front ID section. This determination may be performed by the same method as the conventional method. For example, three or more of the five ID information parts included in the front ID part can be error-corrected, and the track number may be determined by matching the track numbers in the error-corrected ones.
That is, when the track numbers of three or more ID information parts that can be error-corrected are the same, the track numbers are recognized as the number of the currently scanned track. Further, as another method, for example, the track number may be determined by a majority decision from the track number in the ID information part where an error can be corrected.

When the track number is determined in S2 and the track number of the currently scanned track can be specified, the process proceeds to S3, and it is determined whether the track number matches the target track number. If they do not match, it is determined that the seek has failed, and the scan ends. On the other hand, if they match, the process proceeds to S4, the determination flag indicating that the currently scanned track is determined to be the target track is turned on, and the process proceeds to S6.

Further, in S2, when the track number cannot be specified by the front ID section, or when the probability of erroneous recognition of the track number is not sufficiently low, the track number of the currently scanned track is not found. As a confirmation, the process proceeds to S5, the determination flag is turned off, and the process proceeds to S6.

That is, in the present embodiment, when the track number cannot be specified in the front ID section, or, for example, of the five ID information sections of the front ID section, only one ID information section is error-corrected. As described above, although the track number can be specified for the time being, the possibility of erroneous recognition of the track number is high to some extent, and even when the reliability of the read track number is low, the process proceeds to S6 and the data portion 203 Read the information of.

When the reading of the information in the data section 203 is completed in S6, the process proceeds to S7, and the determination flag is ON.
Or OFF. Here, if it is ON, it means that the front side ID part already knows that the scan is a scan on the target track. Therefore, the result of reading the information of the data part performed in S6 is the target. As a result of reading the track, the scan ends.

On the other hand, in S7, the judgment flag is OFF.
If it is, it means that the track number cannot be specified in the front ID section. In this case, the process proceeds to S8 to read the rear ID section. Then, the process proceeds to S9, and the track number is specified from the reading result of the rear ID section. This specifying method may be performed in the same manner as in the case of the front ID section in S2.

If the track number cannot be specified in S9, the seek operation is considered to have failed, and the scan ends.

When the track number can be specified in S9, the process proceeds to S10, and it is determined whether the specified track number matches the target track number in the same manner as in S3. If they do not match, the seek operation is considered to have failed, and the scan ends. If they match, the result of reading the information in the data section performed in S6 is set as the result of reading the target track, and the scan is ended.

As described above, in the present embodiment, when the track number cannot be specified by the reproduction of the ID part preceding the data part, or the track number can be specified by this ID part, the track number Even if it is determined that there is a high probability of erroneous recognition, the data portion is reproduced regardless of whether or not the track number can be specified. Then, after the reproduction of the data section, the ID section behind the data section is reproduced, and if the track number can be specified by this ID section,
The reproduction result of the data section is validated.

As a result, the track number can be specified by reproducing the ID part that precedes the data part by effectively utilizing the ID part that is arranged behind the data part that was originally used only when scanning in the opposite direction. If not possible, each scan can be effectively utilized without invalidating all of the one scan unlike the conventional apparatus. Therefore, it is possible to effectively utilize each scan at the time of recording / reproducing while suppressing the probability of reproducing an erroneous data part due to erroneous recognition of a track number, thereby eliminating wasteful scanning and improving processing efficiency. Is possible.

FIG. 7 is a flow chart showing a data reproducing procedure according to the second embodiment of the present invention.

The second embodiment is an example of reading a plurality of tracks at the same time, and is an example of using a circuit for three tracks corresponding to three systems of the data processing circuit shown in FIG. 5, for example. That is, it can be realized by the above-mentioned multi-track read type device. The configuration of the device is the same as that of the first embodiment, and the description will be omitted.

The data reproducing procedure in the optical card information recording / reproducing apparatus of the second embodiment will be described in detail with reference to the flowchart of FIG. Note that the processing in FIG. 7 is all executed by the control unit 77.

First, in S21, the front ID section is read. Here, the front ID parts of the three tracks are read.

Then, in S22, n lines (here, 3 lines)
The track number is identified from the result of reading the front ID portion of the track. In this specifying method, the track number may be specified from all 15 ID information parts included in the front ID part. For example, the front two ID information parts of the front ID part of each track may be specified. The track number may be specified from the reading result of a part of the ID information parts instead of all the ID information parts such as from six. Here, it is judged that the probability of erroneous recognition of the track number is sufficiently low by this track number specifying method, and if the track number can be specified, the process proceeds to S23.

In S23, the n (3
It is determined whether or not any of the track numbers of the (book) track (these three track numbers are of course consecutive) matches the target track number. If none of them match, the seek is determined to have failed, and the scan ends. On the other hand, if they match, the process proceeds to S24, the determination flag is turned ON, and the process proceeds to S26.

Further, in S22, when the track number cannot be specified by the front side ID part, or the probability of erroneous recognition of the track number is not sufficiently low, S2
5, the determination flag is turned off, and the process proceeds to S26.

That is, in this embodiment, when the track number cannot be specified by the front side ID section, or, for example, one ID out of a total of 15 ID information sections of the front side ID sections of three tracks. As described in the error correction only in the information section, the track number can be specified for the time being, but there is a high possibility that the track number is erroneously recognized, and the reliability of the read track number is low. Then, the process proceeds to step S4 and the information in the data section 203 is read.

When the reading of the information of the data portion 203 is completed in S26, the process proceeds to S27, and it is determined whether the determination flag is ON or OFF. ON here
If it is, it means that the front side ID part already knows that the scan includes the scan on the target track. Therefore, among the read results of the three tracks performed in S26, the target track is selected. The scanning is ended by setting the reading result of the information of the corresponding data portion as the reading result of the target track.

On the other hand, in S27, the determination flag is OF.
If it is F, it means that the track number has not been specified in the front ID section or the probability of erroneous recognition is high to some extent. In this case, the process proceeds to S28 to read the rear ID section. Then, the process proceeds to S29, and the track number is specified from the reading result of the rear ID portion of the three tracks. This specifying method may be the same as the case of the front ID section in S22.

If the track number cannot be specified in S29, the seek operation is considered to have failed, and the scan ends.

When the track number can be specified in S29, the process proceeds to S30, and is specified in the same manner as in S23.
It is determined whether or not one of the track numbers of the book track matches the target track number. If none of them match, the seek operation is considered to have failed, and the scan ends. If any of them coincides, of the three tracks read in S26, the result of reading the information of the data portion corresponding to the target track is set as the target track read result, and the scan is ended.

As described above, in the present embodiment, when a plurality of tracks are reproduced, even if the track number cannot be specified due to the reproduction of the ID part preceding the data part, the data parts of these tracks are not reproduced. Is played back, and then the ID section behind the data section is played back,
When the track number can be specified by the copy section, the reproduction result of the data section is validated.

Therefore, even if the track number cannot be specified by the reproduction of the ID part preceding the data part, each scan can be effectively used without invalidating all the scans for a plurality of tracks, and the processing efficiency is improved. be able to.

[0095]

As described above, according to the present invention, it is possible to effectively use each scan for the optical card at the time of recording / reproducing the optical card, eliminate unnecessary scans, and improve the processing efficiency. There is an effect that can be.

[Brief description of drawings]

1 to 6 relate to a first embodiment of the present invention,
FIG. 1 is a block diagram showing a schematic configuration of an optical card information recording / reproducing apparatus.

FIG. 2 is a structural explanatory view showing a structural example of an optical head provided in an optical card information recording / reproducing apparatus.

FIG. 3 is an explanatory diagram showing a positional relationship between recording and reproducing light beam spots formed on an optical card.

FIG. 4 is an explanatory diagram showing spot images of recording and reproducing light beams projected on a photodetector.

5 is a block diagram showing a detailed configuration of a data processing circuit shown in FIG.

FIG. 6 is a flowchart showing a data reproducing procedure in the first embodiment.

FIG. 7 is a flowchart showing a data reproducing procedure according to the second embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a configuration example of an optical card.

9 is an explanatory diagram showing a format of a track ID portion in the optical card of FIG.

FIG. 10 is an explanatory diagram showing a relative velocity pattern in a relative reciprocating motion (scan) between the optical card and the optical head.

[Explanation of symbols]

 7 ... Optical card 71, 81, 91 ... Light receiving element 74, 84, 94 ... Demodulation circuit 76, 86, 96 ... Memory 77 ... Control part 78 ... Error correction circuit 102 ... Optical head drive circuit 104 ... Optical head 105, 109 ... Motors 106, 108 ... Rotary encoder 107 ... Motor servo circuit 110 ... Conveying belt 111 ... Conveying stand 113 ... Data processing circuit 200 ... Tracks 202a, 202b ... ID section 203 ... Data section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takumi Sugaya 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Takaro Rokutan 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd.

Claims (1)

[Claims] 1. An optical card having a plurality of tracks, wherein each track is provided with a data section for recording information and an ID section including track address information arranged at both ends of the data section. In the optical card information recording / reproducing apparatus for recording / reproducing information by relatively reciprocating the optical card and the optical head, when reproducing the information recorded on the optical card, the optical card information recording / reproducing device is provided in front of the data section. An optical card information recording / reproducing apparatus comprising a control means for controlling the reproduction of the data portion even when the identification of the track address in the arranged ID portion fails.