JPH0689502A - Device for recording and eproducing optical card information - Google Patents

Abstract

PURPOSE:To shorten a processing time required for recording/reproducing information by ending data reproduction processing within one scan and enabling the device to immediately scan for next recording. CONSTITUTION:In a control part 77 provided on an optical card information recording and reproducing device, demodulational operation of the information modulated and recorded in a data processing circuit 113 is executed during the constant speed time of relatively reciprocal movement between an optical card 7 and an optical head 104 when the information modulated and recorded in the optical card 7 is reproduced. Then, an error for demodulated data is corrected by an error correction circuit in the data processing circuit 113 till a reduction time and a setting time in the relativelly reciprocal movement between the optical card 7 and the optical head 104, and the data of the error correction result is controlled so as to be transferred to a host computer.

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. 9, an optical card 7 is provided with an optical recording section 201 having a plurality of tracks 200 parallel to each other 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. 9, 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, in Japanese Patent Application Laid-Open No. 2-141932, a binarized signal from a light receiving element provided for each of a plurality of tracks is sampled by a high frequency clock and stored in a memory, and then sampled from the memory. An apparatus has been proposed in which a data processing system is downsized by reading a digitized signal and processing the signal.

In the apparatus of the above publication, the multi-track read type is essentially used in the case where the relative reciprocating movement speed of the optical head and the optical card is high to some extent and the large-capacity high-speed memory is expensive. However, there was a problem that it was not possible to sufficiently cope with the increase in the data reading speed, which is the purpose of.

Therefore, 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. .

By the way, such an optical card information recording / reproducing apparatus is usually connected to a host computer via an interface (such as SCSI) and operates based on a command from the host computer. For example,
When reproducing information from the optical card, the information recording / reproducing apparatus receives a command from the host computer, accesses the track designated by the command on the optical card to reproduce the information, and then reproduces the reproduced information to the host computer. Forward.

As described above, in such an optical card information recording / reproducing apparatus, information is recorded / reproduced by relatively reciprocating the optical card and the optical head in the track direction. How to combine the time relationship between the reciprocating motion and the information reproducing operation such as transfer of reproduced information to the host computer is very important from the viewpoint of shortening the information reproducing time.

In Japanese Patent Laid-Open No. 62-131317, the information read from the optical card is temporarily stored in a memory, and the reproduced information is transferred to the host computer when the reciprocating motion is reversed (deceleration or acceleration). As a result, an optical card information recording / reproducing apparatus has been proposed in which the information reproducing time is shortened. FIG. 10 is a time chart for explaining the information reproducing operation by this apparatus.

When a read command is input from the host computer, the optical head is moved to the target track of the optical card to start a relative reciprocating motion in the track direction, and then the card moving speed becomes a constant speed for recording. When the optical head reaches the area, the data is read and the demodulation operation is started (point A). During this constant speed period, the demodulation operation is performed while temporarily storing the demodulation result in the memory, the optical head reaches the outside of the recording area, and the data demodulation operation ends (point B). Then, the contents of the stored memory are read so that the reproduction information can be immediately transferred (point C). When there is a transfer request in this state, the contents of the memory are started to be transferred to the host computer (point D). Then, when all the contents of the memory are read out, the transfer ends (point E). In this way, the information reproduction time is shortened by transferring the reproduction information to the host computer when the reciprocating motion is reversed (during deceleration or acceleration).

[0017]

In an optical card information recording / reproducing apparatus, normally, recorded data is error-correction coded and recorded on a track of an optical card, and at the time of reproduction, error correction is performed on a demodulation result of the reproduced data. Processing is performed.

However, the above-mentioned JP-A-62-13 is used.
In the optical card information recording / reproducing apparatus of Japanese Patent No. 1317, the error correction processing is not considered at all, and the transfer time of the reproduction data varies depending on the data amount and the like, and therefore the information reproduction is performed when the error correction processing operation period is included. There is a problem that the time cannot be shortened well.

Further, as is apparent from FIG. 10, in this apparatus, one track of data reproduction processing is one scan of the optical card transport means, that is, one acceleration indicated by F in FIG. Since it is not necessarily completed in the period until deceleration, there is no particular problem in the case of continuous data reproduction for multiple tracks, but when the data recording operation is in the middle, a period for performing error correction coding etc. is necessary, One scan may be wasted.

The present invention has been made in view of the above circumstances, and effectively utilizes the deceleration period and settling period of the relative reciprocating motion between the optical card and the optical head, and within this period, error correction and data To provide an optical card information recording / reproducing apparatus capable of performing transfer, shortening the processing time required for recording / reproducing information even when including data recording processing, and improving the processing efficiency. It is an object.

[0021]

An optical card information recording / reproducing apparatus according to the present invention is an optical card having a plurality of tracks, each track including an information recording area for recording information. In a device for recording and reproducing information by relatively reciprocating the optical head and an optical head, demodulation means for demodulating information that is error-correction coded and modulated and recorded in an information recording area of the optical card, and the demodulation means. Error correction means for performing error correction on the demodulated data demodulated by, and when reproducing the information recorded by modulation,
During the constant speed period of the relative reciprocating motion of the optical card and the optical head, the demodulation operation of the information recorded by modulation by the demodulating means is executed, and the deceleration period of the relative reciprocating motion of the optical card and the optical head. And, by the settling period, there is provided control means for controlling the error correction of the demodulated data by the error correction means and the data transfer of the error correction result to be completed.

[0022]

When reproducing the information which has been error-correction coded and modulated and recorded in the information recording area of the optical card, the control means controls the constant reciprocating motion of the optical card and the optical head during a constant speed period. A demodulation operation of the information modulated and recorded by the demodulation means is performed, and error correction is performed on the demodulated data by the error correction means by a deceleration period and a settling period of the relative reciprocal movement of the optical card and the optical head. The data transfer of the error correction result is controlled to be completed.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 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 diagram showing a spot image of a beam, FIG. 5 is a block diagram showing a detailed configuration of the data processing circuit shown in FIG. 1, and FIG. 6 is a velocity pattern and data processing in relative reciprocal movement between an optical card and an optical head. FIG. 7 is an explanatory diagram showing the relationship with the operation, and FIG. 7 is a flowchart showing the 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. 9, 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 the tracks. 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 reciprocally conveyed in the track direction by driving the motor 109, and by driving 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 includes an optical card 7 similar to 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.

Further, 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.

This recording light beam is emitted from 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 diverging 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 and the spot 25b or 25c formed by the 1st-order diffracted light of the reproduction light beam. 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 formed by 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, 53 for signal reproduction and the light receiving elements 61, 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 occurs. 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 the signal reproduction light receiving elements 51, 52 and 53 in FIG. 4, for example.

The data processing circuit 113 is provided with I / V converters 72, 82, 92, and the outputs of the signal reproducing light-receiving elements 71, 81, 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, 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, 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 and the memories 76, 86, 96, etc. in 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 code, the memories 76, 86, 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 loaded 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 supplies 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.

When performing reproduction, the semiconductor laser 40 for reproduction of the optical head 104 is driven to irradiate a reproduction light beam onto the optical card 7, and the reflected light is detected by the optical head 104 for signal reproduction. The light is received by the device 17 and the data is read according to the intensity of the reflected light. The read signal is processed by the data processing circuit 113 for each track, and the demodulated data is stored in the memories 76, 86,
It is stored in 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.

Here, the relationship between the relative reciprocating movement of the optical card 7 and the optical head 104 in the track direction and the timing of the data processing operation will be described with reference to FIG.

In FIG. 6, the relative speed is the relative speed of the reciprocating motion of the optical head 7 and the optical card 104. Further, what is described as data processing content is the processing content of the data processing circuit 113 shown in FIG.

First, the carrier table 111 on which the optical card 7 is mounted
Is accelerated from the stationary state to the constant speed state by the time it reaches the ID section 202 in which the track number and the like are prerecorded. Then, the ID section 202 is reproduced in a constant speed state, the track number is determined from the ID section 202, and if the track is the target track, the process for reproducing the data recorded in the data section 203 is directly performed. The reproduction of the ID section 202 for the determination of the track number may be performed by a circuit of one system for one track in the data processing circuit shown in FIG. 5, or by using a circuit of three systems. Three
It is also possible to reproduce the book.

The optical head 104 has a data recording area (see FIG. 9).
5), the recorded data appears on the signal reproducing light-receiving elements 71, 81, 91 in FIG. This output signal is current-voltage converted by the I / V converters 72, 82 and 92, and binarized by the binarization circuits 73, 83 and 93 at the reference level to generate a binarized signal. The binarized signals obtained by the binarization circuits 73, 83, 93 are the bit clock generation circuits 75, 85, 95 and the demodulation circuit 74,
The binarized signal is input to 84 and 94, and the binarized signal is sampled by the bit clock generated by the bit clock generation circuit in the demodulation circuits 74, 84 and 94, and the data demodulation is executed. This demodulated data is stored in the memory 7 as it is.
6,86,96.

In the data processing operation up to this point, as shown in FIG. 6, the carriage 111 is in a constant speed state, that is, the optical head 1
04 and the optical card 7 are in a constant speed state, and are executed while the optical head 104 passes through the data recording area.

When the optical head 104 has finished passing through the data recording area, the carriage 111 is decelerated. In this state, the control unit 77 causes the error correction circuit 78 to error-correct the demodulated data (data before error correction) stored in any (or all) of the memories 76, 86, and 96. Instruct. The error correction circuit 78 performs error correction and stores the result again in the memory 76 or the like. Of course, another memory may be provided and the error correction result may be stored therein.

Dedicated hardware is generally used for the error correction circuit 78, and therefore the error correction execution time is much shorter than the time required for the optical head 104 to pass through the data recording area. Specifically, if the speed of the carrier table in the constant velocity region is 640 mm / sec and the length of the data recording region is 60 mm, it takes about 93.4 msec for a series of processes of binarization → demodulation → memory storage. In comparison, the error correction execution time is about 5 msec at the maximum per track. Normally, the deceleration period is about 30 to 50 msec including the settling period of the carrier (the period until the vibration of the carrier falls within the allowable range), so the error correction processing for three tracks is sufficient within this period. It is feasible.

After the error correction processing is executed, the error correction execution result stored in the memory 76 or the like is transferred to the host computer as reproduction data via an interface circuit (not shown) connected to the control unit 77. Normally, this data transfer is performed by DMA transfer (Direct Memory Access) between the memory and the interface circuit, and the transfer period is a few msec. Therefore, it can be executed within the deceleration period and settling period together with the error correction process described above. Is.

Normally, in the data recording operation, the control unit 7
7 receives recording data from the host computer, performs error correction coding on the data, and records the data on the track of the optical card. The reception of the recording data and the error correction coding are for shortening the recording operation. In many cases, it is executed before activating the optical card transporting means such as the transport table 111 or during the acceleration period before the constant speed after activation. Therefore, considering the operation at the time of recording data, the data reproduction processing operation including the above-mentioned error correction processing and data transfer processing is completed by one scan of the optical card transport means in order to shorten the processing time. There is a need.

In this embodiment, since the error correction processing and the data transfer processing can be executed within the deceleration period and the settling period as described above, the data reproduction processing can be completed within one scan. It is possible to immediately start the recording operation by scanning, and eliminate unnecessary scanning.

Next, a more detailed data reproducing procedure is shown in FIG.
This will be described with reference to the flowchart shown in. Note that the processing in FIG. 7 is all executed by the control unit 77.

The data reproducing procedure of the first embodiment shown in FIG. 7 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 control section 77 receives a data reproduction command from the host computer. Subsequently, in S2, the control unit 77 calculates the movement amount of the optical head 104 from the track number where the optical head 104 is currently located and the target track number to be read which is sent together with the command from the host computer. , Optical head drive circuit 102
The optical head 104 is relatively moved in the direction orthogonal to the track of the optical card 7 by instructing. Then, in S3, it is determined whether or not the relative movement is completed.

Next, in S4, the motor servo circuit 107 is instructed to move the optical head 104 in the track direction of the optical card 7.
The optical card 7 is moved relative to each other so as to move relative to each other. That is, from this time point, the acceleration range shown in FIG. 6 is entered. After that, in S5, the control unit 77 monitors the signal from the motor servo circuit 107 to determine whether or not the relative moving speed between the optical head 104 and the optical card 7 is constant, that is, the optical head 104 reaches the ID unit 202. If it reaches the ID section 202, it proceeds to S6.

Subsequently, in S6, the data processing circuit 113 shown in FIG. 5 reads the ID section 202, and in S7, the track number of the read ID section is compared with the target track number to be read. Here, if they are different, the process proceeds to S16 to instruct the motor servo circuit 107 to stop the relative movement between the optical head 104 and the optical card 7, and in S17, it is determined whether or not the settling time is exceeded. Wait for the carriage 111 to settle. And after the settling time has passed,
The operation is repeated from S2 again.

On the other hand, if it coincides with the target track number to be read in S7, the process proceeds to S8, and the control section 77 instructs the data reproducing circuit for one track shown in FIG. 5 to execute data reproduction. While the data reproducing circuit is executing a series of processes of binarization->demodulation-> memory storage, the control unit 77 waits for a signal from the data reproducing circuit indicating the completion of data demodulation in S9.

When the execution of the data demodulation is completed and the demodulated data is stored in the memory 86, the control unit 77 causes the motor servo circuit 107 to stop the relative movement between the optical head 104 and the optical card 7 in S10. In order to instruct to slow down. That is, from this time point, the deceleration range shown in FIG. 6 is entered. Further, the control unit 77 starts a timer inside the control unit 77 in order to measure a time obtained by adding a settling time to a deceleration time required for stopping the carrier table 11 in which the optical card 7 is loaded.

Subsequently, in S11, the control section 77 instructs the error correction circuit 78 to execute error correction of the demodulated data stored in the memory 86. The error correction circuit 78 executes error correction and stores the execution result in the memory 86 again. In S12, the control unit 77 waits for the error correction end signal from the error correction circuit 78, and if detected, S
At 13, the error correction result stored in the memory 86 is started to be transferred to the host computer via an interface circuit (not shown).

Then, when it is detected that the data transfer is completed in S14, the control unit 77 causes S10 to execute S10 in S15.
It is judged from the contents of the timer started in step 1 whether the settling time required for stopping the carrier 111 has been exceeded, and when the settling time is exceeded, the command is terminated,
Relative movement in the next track direction, that is, the carriage 111
It is possible to move.

Of course, when the data transfer to the host computer is completed in S14, the host computer is notified of the completion of the command received in S1, and S1
In step 5, while checking whether or not the settling time has been exceeded, the operation of receiving the next command from the host computer may be performed in parallel.

As described above, according to the present embodiment, the deceleration period and settling period of the relative reciprocating motion of the optical card and the optical head are effectively used, and within this period, error correction and data transfer to the host computer are performed. I'm trying to do. Therefore, since a series of processing for data reproduction is completed at the time when the carriage is settled, it is possible to immediately drive the carriage even when data is recorded in the next scan. Therefore, even when the data recording process is included, the processing time required for recording / reproducing information can be shortened without performing unnecessary scanning, and the processing efficiency can be improved.

FIG. 8 is a flow chart showing a data reproducing procedure according to the second embodiment of the present invention.

The second embodiment is an example in which a plurality of tracks are read out at the same time, and for example, a circuit for three tracks corresponding to three systems of the data processing circuit shown in FIG. 5 is used. 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. The processing in FIG. 8 is all executed by the control unit 77.

First, in S21, the control section 77 receives a data reproduction command from the host computer. Then, in S22, it is checked whether or not the target track number to be read, which is sent together with the command from the host computer, is included in the three tracks read in the previous scan. As a result, in the case of tracks other than the three tracks read in the previous scan, S
Then, the operation proceeds to step 23, and the operation similar to that of the first embodiment is performed. If the target track is included in the three tracks read in the previous scan, the process proceeds to S32. That is, in this case, the memories 76 and 8 of FIG.
Since the demodulation result of the target track is stored in any of Nos. 6 and 96, scanning in the track direction is not performed.

In S23, the control unit 77 calculates the movement amount of the optical head 104 from the track number where the optical head 104 is currently located and the target track number.
The optical head 104 is instructed to the optical head drive circuit 102.
Is relatively moved in the direction orthogonal to the track of the optical card 7. Then, in S24, it is determined whether or not the relative movement is completed, and when completed, the process proceeds to S25.

Next, in S25, the motor servo circuit 107 is instructed to move the optical head 10 in the track direction of the optical card 7.
The optical card 7 is relatively moved so that 4 relatively moves.
That is, from this time point, the acceleration range shown in FIG. 6 is entered.
Thereafter, in S26, the control unit 77 causes the motor servo circuit 107
From the optical head 104 to determine whether the relative moving speed between the optical head 104 and the optical card 7 is constant, that is, whether the optical head 104 reaches the ID unit 202, and I
When it reaches the D section 202, the process proceeds to S27.

Subsequently, in S27, the data processing circuit 113 shown in FIG. 5 reads the ID sections 202 for three tracks, and in S28, the track numbers of the read ID sections for three tracks are set to It is determined whether or not the target track number to be read is included. Here, if the target track number is not included, the process proceeds to S37 to instruct the motor servo circuit 107 to stop the relative movement between the optical head 104 and the optical card 7, and whether the settling time is exceeded in S38. It is determined whether or not to wait for the carriage 111 to settle. After the settling time has elapsed, the operation is repeated from S23.

On the other hand, when the target track number to be read is included in the track numbers of the ID parts for the three tracks read in S28, the process proceeds to S29.
Reference numeral 7 instructs the data reproducing circuit for three tracks shown in FIG. 5 to execute data reproduction. While this data reproduction circuit is executing a series of processes of binarization → demodulation → memory storage,
In S30, the control unit 77 waits for a signal from the data reproduction circuit indicating that the data demodulation has been completed.

When the data demodulation is completed, the memory 76,
When the demodulated data is stored in 86 and 96, the control unit 77 causes the motor servo circuit 107 to stop the relative movement between the optical head 104 and the optical card 7 in S31.
Instruct to slow down. That is, from this point
Enter the deceleration area indicated by. Further, the control unit 77 starts a timer inside the control unit 77 in order to measure a time obtained by adding a settling time to a deceleration time required for stopping the carrier table loaded with the optical card 7.

Subsequently, in S32, the control section 77 instructs the error correction circuit 78 to execute error correction of the demodulated data stored in the memories 76, 86 and 96. In S22, if the target track number to be read, which is sent together with the command from the host computer, is included in the three tracks read in the previous scan, this operation is started.

The error correction circuit 78 performs error correction on the demodulation result stored in any one of the memories 76, 86 and 96 corresponding to the target track number, and the execution result is again stored in the memory. To store. S33
Then, the control unit 77 waits for the error correction end signal from the error correction circuit 78, and when it detects it, starts to transfer the error correction result stored in the memory to the host computer via the interface circuit (not shown) in S34.

When it is detected in S35 that the data transfer is completed, the control section 77 determines in S36 that S31 has been completed.
It is judged from the contents of the timer started in step 1 whether the settling time required for stopping the carrier 111 has been exceeded, and when the settling time is exceeded, the command is terminated,
Relative movement in the next track direction, that is, the carriage 111
It is possible to move.

Of course, when the data transfer to the host computer is completed in S35, the host computer is notified of the completion of the command received in S21, and S
At 36, checking whether the settling time has been exceeded,
The operation of receiving the next command from the host computer may be performed in parallel. Further, in S22, if the target track number to be read, which is sent together with the command from the host computer, is included in the three tracks read in the previous scan, it is not necessary to execute S36.

As described above, according to the present embodiment, the data reproducing process is completed by the deceleration period and settling period of the relative reciprocal movement of the optical card and the optical head, and then the data recording is performed. In any case, that is, the scan for data recording can be started. Along with this, if there is already demodulated data in the memory in the previous scan for data reproduction, error correction is immediately executed without moving the carrier and it is transferred to the host computer. The scan can be effectively used, and the data reproduction time can be shortened.

[0099]

As described above, according to the present invention, the deceleration period and the settling period of the relative reciprocating motion between the optical card and the optical head are effectively used, and error correction and data transfer are performed within this period. In addition, the processing time required for recording / reproducing information can be shortened even when the data recording processing is included, and the processing efficiency can be improved.

[Brief description of drawings]

1 to 7 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 an explanatory diagram showing a relationship between a speed pattern and a data processing operation in a relative reciprocating motion of an optical card and an optical head.

FIG. 7 is a flowchart showing a data reproducing procedure in the first embodiment.

FIG. 8 is a flowchart showing a data reproducing procedure according to the second embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a configuration example of an optical card.

FIG. 10 is a time chart explaining an information reproducing operation by a conventional optical card information recording / reproducing apparatus.

[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

Front page continued (72) Inventor Takumi Sugaya 2-43-2 Hatagaya, Shibuya-ku, Tokyo 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, each track including an information recording area for recording information, the information is recorded by relatively reciprocating the optical card and the optical head. In an optical card information recording / reproducing apparatus for reproducing, demodulation means for demodulating information that has been error-correction coded and modulated and recorded in the information recording area of the optical card, and an error for the demodulated data demodulated by the demodulation means. Error correction means for making a correction and demodulation of the modulated and recorded information by the demodulation means during a constant speed period of relative reciprocal movement between the optical card and the optical head when reproducing the modulated and recorded information. The error correction is performed on the demodulated data by the error correction means before the deceleration period and the settling period of the relative reciprocating motion between the optical card and the optical head by executing the operation. -An optical card information recording / reproducing apparatus comprising: a control unit that controls to complete data transfer of a correction result.