JP2002342924A - Card-shaped recording medium and recording and reproducing unit for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make rotatable a card-shaped recording medium around the central part of a card, and to make stably recordable and reproducible data. SOLUTION: The card-shaped recording medium 1 is provided with a center hole 2 at the central position of the medium 1, outer peripheral part tracks 3 formed into a circular arc shape resulting from lack of a part of concentric circles or spirals with the center hole 2 as the center, inner peripheral part tracks 4 which are concentric circles or spirals with the center hole 2 as the center inside the outer peripheral part tracks 3, gap areas 5 for switching the servo control between the outer peripheral part tracks 3 and the inner peripheral part tracks 4, servo drawing areas 6a and 6b for drawing servos again at the position where an optical pickup part 12 advances into the outer peripheral part tracks 3, end of data detecting areas 7a and 7b for detecting the end of an area to record data at the position where the optical pickup part 12 leaves the outer peripheral part tracks 3, and recording/reproducing areas 8a and 8b for recording and reproducing data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card-shaped recording medium and a recording / reproducing apparatus therefor, and more particularly, to a card-shaped recording medium in which information is recorded / reproduced by being rotated about a central portion of the card, and a recording medium therefor. It relates to a playback device.

[0002]

2. Description of the Related Art In recent years, as a recording medium on which audio data and video data are recorded, there is a card-shaped recording medium formed in a small card (rectangular) shape. A linear track 101a is formed on the surface of the card-shaped recording medium 100a shown in FIG. When data is recorded / reproduced, the card-shaped recording medium 100a is irradiated with a light beam from a fixed optical pickup unit 102a provided in the recording / reproducing apparatus, and is slid in the short and long directions.
Such a recording / reproducing apparatus is an apparatus that performs a recording / reproducing process by a so-called XY driving method.

As shown in FIG. 12, a card-shaped recording medium 100a is slidable in a short direction of a card-shaped recording medium 100a provided in a recording / reproducing apparatus when data is recorded / reproduced. Optical pickup unit 102b
The light beam is irradiated, scanned, and slid in the longitudinal direction. Such a recording / reproducing apparatus is an apparatus that performs a recording / reproducing process by a so-called galvanomirror method.

Further, a card-shaped recording medium 10 shown in FIG.
At 0b, an arc-shaped track 101b is formed on the surface along an arc defined by a predetermined fan angle of concentric circles in the short direction. When data is recorded and reproduced, the card-shaped recording medium 100b has a rotation center 1 provided in the recording and reproducing device.
Scanning is performed by irradiating a light beam from a rotary optical pickup unit 102c that is rotatable around 03,
It is slid in the longitudinal direction. Such a recording / reproducing apparatus is an apparatus that performs a recording / reproducing process by a so-called optical system rotation system. Here, when the track of the card-shaped recording medium 100b is formed along the arc defined by a predetermined concentric circle fan angle in the longitudinal direction, the card-shaped recording medium 10b
0b is slid in the longitudinal direction.

[0005]

Incidentally, a recording / reproducing apparatus adopting the XY drive system is a card-shaped recording medium 10.
There is a problem that a drive unit is required to slide Oa in the short and long directions, and the entire apparatus becomes large. In addition, since the driving section reciprocates the card-shaped recording medium 100a in the short and long directions, there is also a problem that the data transfer speed when recording and reproducing data becomes slow.

Further, the recording / reproducing apparatus adopting the galvanomirror system has a problem that the galvanomirror optical system is separately required and the cost is high.

In the recording / reproducing apparatus adopting the optical system rotation system, when the card-shaped recording medium 100b is slid in the short or longitudinal direction, the card-shaped recording medium 100b is moved in a sliding direction and a direction perpendicular to the direction. There is a problem that there is a risk that the 100b may be displaced.

Accordingly, the present invention has been proposed in view of the various situations described above, and is a card-shaped recording medium which is rotated about a central portion of a card so that data can be stably recorded / reproduced, and its recording medium. It is intended to provide a playback device.

[0009]

In order to solve the above-mentioned problems, the card-shaped recording medium according to the present invention is provided with a center of rotation at the center of the card and a center of rotation on the card surface. An information recording area is formed in an arc shape around the center, and a servo pull-in area is formed at a position where the optical pickup head enters the information recording area.

In this card-shaped recording medium, the center of rotation of the card is provided with the center of rotation, so that no displacement occurs due to sliding, and the information recording area is formed in an arc on the card surface centered on the center of rotation. The servo control signal is drawn in the servo pull-in area because the servo pull-in area is formed at the position where the optical pickup head enters the information recording area.

In order to solve the above-mentioned problems, a recording / reproducing apparatus according to the present invention has a mounting means on which a card-shaped recording medium is mounted, and a rotation center of the card-shaped recording medium mounted on the mounting means. Rotation means for rotating as, rotation angle detection means for detecting the rotation angle of the information recording area formed in an arc on the card-shaped recording medium rotated by the rotation means,
An optical pickup head for irradiating a light beam for recording and / or reproducing information to and from the information recording area; and a light beam emitted from the optical pickup head is reflected on a reflection surface of the information recording area and generated by the reflection. A servo control signal detecting means for detecting a servo control signal from the reflected light, and a servo control signal detected by the servo control signal detecting means when the rotation angle detected by the rotation angle detection means enters the servo pull-in area. Servo control signal pull-in means, servo drive means for adjusting the position of the optical pickup head based on the servo control signal drawn by the servo control signal pull-in means, and forming on the card-shaped recording medium by the light beam emitted from the optical pickup head Storage means for storing a plurality of pieces of address information read from the read information recording area; Recording means for writing information to a card-shaped recording medium by using a plurality of address information stored in the storage means, and reproducing means for reading information from the card-shaped recording medium by using a plurality of address information stored in the storage means And

This recording / reproducing apparatus rotates the mounted card-shaped recording medium about its rotation center,
A servo control signal is generated by detecting the rotation angle of the information recording area formed in an arc shape on the card-shaped recording medium and reflecting the light beam emitted from the optical pickup head by reflecting off the reflection surface of the information recording area. Is detected, and when the rotation angle has entered the servo pull-in area of the card-shaped recording medium,
The detected servo control signal is pulled in, the position of the optical pickup head is adjusted from the drawn servo control signal, and a plurality of address information read from the information recording area by the light beam emitted from the optical pickup head is stored. The information is written and / or read on the card-shaped recording medium using the address information.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a card-shaped recording medium 1 shown as an embodiment of the present invention. The card-shaped recording medium 1 has a center hole 2
Are provided, and an outer track 3 and an inner track 4 for recording and reproducing data are formed.

The outer track 3 is formed in an arc shape in which a part of a concentric circle or a spiral around the center hole 2 is cut off from the surface of the card-shaped recording medium 1. The inner circumferential track 4 is formed inside the outer circumferential track 3 in a concentric or spiral shape centered on the center hole 2.

In the card-shaped recording medium 1, no track is formed in an area between the outer track 3 and the inner track 4. This area is a gap area (Gap Area) 5 for switching the servo control between the outer track 3 and the inner track 4. The gap area 5 is used not only for switching servo control between the outer track 3 and the inner track 4 but also for switching information recording density, reproduction speed, and the like.

Further, since the outer track 3 is formed in an arc shape in the card-shaped recording medium 1, a servo pull-in for drawing a servo again into a position at which the optical pickup section 12 described later enters the outer track 3 is performed. Regions 6a and 6b
And data end detection areas 7a and 7b for detecting that an area for recording and reproducing data has ended at a position where the optical pickup section 12 retreats from the outer track 3. That is, the outer track 3 includes the servo pull-in areas 6a and 6b, the data end detection areas 7a and 7b,
It consists of recording and reproducing areas 8a and 8b for recording and reproducing data.

The above-described servo pull-in areas 6a and 6b, data end detection areas 7a and 7b, and recording / reproducing areas 8a and 8
b will be described in more detail with reference to FIG. FIG.
1 schematically shows one of a plurality of outer peripheral tracks 3 formed on the card-shaped recording medium 1.

The servo pull-in area 6a includes a light beam emitted from an optical pickup unit 12 located on the right side of the card-shaped recording medium 1 when the card-shaped recording medium 1 is rotated clockwise in the rotation direction R of the card-shaped recording medium 1. When a point of intersection with a reference point k is defined as a reference point k, a degree to a '
It is provided in a range of degrees. The servo pull-in area 6b is provided in a range of b degrees to b 'degrees from the reference point k. The range of a degrees to a 'degrees and the range of b degrees to b' degrees are ranges in which the arc-shaped outer peripheral track 3 reenters the reference point k. That is, a degree and b degree and a ′ degree and b ′ degree are in a relation of 180 degrees each other.

The data end detection area 7a is provided in the range of c degrees to c 'degrees from the reference point k.
b is provided in the range of d degrees to d ′ degrees from the reference point k. The degrees c and d and the degrees c ′ and d ′ are 180 degrees, respectively.
They are in a relationship facing each other.

The recording / reproducing area 8a has a servo pull-in area 6a.
And the area excluding the data end detection area 7a,
The recording / reproducing area 8b is provided in the range of a ′ degree to c degree,
It is provided in the range of b ′ degree to d degree.

Next, an example of the recording format on the outer track 3 is shown in FIG. When a sequence of input data is represented as X, the sequence X is composed of bit information of 1 and 0. The series X is a sync pattern area SP (Sync Pattern)
n), data area D (Data) and track end area ET
(End of Track). The synchronization pattern area SP is used for pulling in a servo. The data area D is used for recording and reproducing data. The track end area ET is used to detect that the area for recording and reproducing data has ended. The bit information 1 and 0 of the series X are directly stored on the card-shaped recording medium 1 as 2 bits.
When recording is performed in correspondence with one state, for example, with or without a hole, a recording signal waveform Z is obtained.

In the outer track 3,
Synchronization pattern area SP, data area D, track end area
FIG. 4 shows the position of each area ET. Synchronization pattern area
SP ₁Is the data area D in the servo pull-in area 6a.₁Is
A track end area ET is provided in the recording / reproduction area 8a.₁Is the day
Respectively correspond to the data end detection areas 7a. In addition, the synchronization
Turn area SP₂Indicates the data area in the servo pull-in area 6b.
Area D₂Indicates a track end area ET in the recording / reproducing area 8b.
₂Correspond to the data end detection area 7b.

Next, the session Se1 and the session S
FIG. 5 shows an example of the information area of the card-shaped recording medium 1 having two sessions e2. The audio data DA is recorded in the session Se1, and the data DC is recorded in the session Se2. One session includes a lead-in LI (Lead In), a plurality of tracks Tr (Track), and a lead-out LO (Lead Ou).
t). That is, the session Se
1 is a lead-in LI1, a track Tr1 ₁ ,.
The track Tr1 _p includes a lead-out LO1. Session Se2 consists of lead-in LI2, track Tr
2 _1,..., Track Tr2 _q, the lead-out LO2
Consists of

The session Se1 and the session Se
There is a physical gap between the two sessions. Also,
In the lead-in LI1 and the lead-in LI2, TOC (Table Of Contents) indicating addresses of all tracks is recorded. As a result, the physical block (GAP) indicating the gap between the sessions described above with respect to the address indicating the end of the lead-out LO1 written in the TOC.
Then, the address obtained by adding the error (α) of the physical block becomes the address of the lead-in LI2.

Next, FIG. 6 shows a schematic configuration of a recording / reproducing apparatus 10 for recording / reproducing data on / from the card-shaped recording medium 1 described above. The recording / reproducing apparatus 10 includes a mounting section 11 on which the card-shaped recording medium 1 is mounted, an optical pickup section 12 for irradiating the card-shaped recording medium 1 with a light beam during recording and reproducing to detect a signal, and an optical pickup. A servo control signal generating section 19 for generating a servo control signal for controlling each control section based on the signal detected by the section 12; a spindle motor 13 for rotating the card-shaped recording medium 1;
Motor 2 for moving the spindle motor 2 in the longitudinal direction of the card-shaped recording medium 1, a spindle motor controller 15 for controlling the operation of the spindle motor 13, a sled motor controller 16 for controlling the operation of the sled motor 14, and an optical pickup unit A tracking control unit 17 for swinging an objective lens 12 (not shown); a focusing control unit 18 for moving the objective lens of the optical pickup unit 12 in the vertical direction with respect to the card-shaped recording medium 1 to control the focus of the light beam; A modulation unit 20 for converting data into a signal during recording, a demodulation unit 21 for converting a signal detected by the optical pickup unit 12 into data during reproduction, and a rotation angle detection unit 22 for detecting a rotation angle of the outer track 3 And the servo control signal generator 19 outputs a signal in accordance with the detection signal detected by the rotation angle detector 22. And ON / OFF control section 23 to servo control signal and the modulation unit 20 to control the ON / OFF of the recording signal to be output, information data or the like and a storage unit 24 to be stored.

The recording / reproducing apparatus 10 configured as described above
Function as follows. Optical pickup unit 1
Numeral 2 is composed of an optical system such as a light beam light source, an objective lens, a condenser lens, a photodiode, and a driving system such as an actuator, and irradiates a track of the card-shaped recording medium 1 with a light beam to transmit data. At the same time as recording, a signal is detected from the reflected light to reproduce data and address.

The servo control signal generating section 19 generates a servo control signal for controlling each control section based on the signal detected from the optical pickup 12, and outputs the servo control signal to the spindle motor control section 1.
5, sled motor control unit 16, tracking control unit 1
7. Output to the focusing control unit 18.

The spindle motor control unit 15 controls the spindle motor 13 based on the input signal to rotate the card-shaped recording medium 1. The thread motor control unit 16
The sled motor 14 is controlled based on the input signal to slide the card-shaped recording medium 1 in the longitudinal direction. The tracking control unit 17 swings the objective lens of the optical pickup unit 12 based on the input signal, and controls the position of the beam spot irradiated on the surface of the card-shaped recording medium 1. The focusing control unit 18 controls the focus adjustment of the light beam by moving the objective lens of the optical pickup unit 12 in the vertical direction based on the input signal.

The modulating unit 20 stores data in the storage unit 23 during recording.
Is converted into a signal and output to the optical pickup unit 12.

The demodulation unit 21 converts a signal detected by the optical pickup unit 12 during reproduction into data, and
Output to 3.

The rotation angle detector 22 detects the rotation angle of the outer track 3 in accordance with the rotation of the card-shaped recording medium 1.

The ON / OFF control unit 23 controls the spindle motor control unit 15, the sled motor control unit 16, the tracking control unit 17, and the focusing unit according to the detection signal output from the rotation angle detection unit 22. Servo control signal output to control section 18 and modulation section 2
0 controls ON / OFF of the output recording signal.

As shown in FIG. 7, the storage unit 24 stores an information table 30 including addresses, data, and flags. At the time of recording, data D0, D1, D2,.
Is prepared. Further, by reading data management information such as TOC recorded on the card-shaped recording medium 1, addresses A0 and A of a recordable area (unrecorded area) are read.
1, A2,..., An are obtained. Address A0, A
, An are data D0, D1, D2,.
,..., Dn are recorded on the card-shaped recording medium 1 in which locations, and data D0, D1, D2,.
It is stored in the information table 30 together with Dn. Thus, the data D0, D1, D2,..., Dn are recorded on the card-shaped recording medium 1 in accordance with the addresses A0, A1, A2,.

At the time of reproduction, data management information such as TOC recorded on the card-shaped recording medium 1 is read out, so that data D0 to be reproduced,
D1, D2,..., Dn addresses A0, A1, A
, An are obtained. Address A0, A1, A
, An are stored in the information table 30.
Thereby, the data D0, D1, D2,..., Dn
Are reproduced from the card-shaped recording medium 1 according to the addresses A0, A1, A2,..., An and stored in the information table 30.

Thus, the data D0, D1, D2,.
.., Dn are addresses A0, A1, A2,.
, Fn are set in the information table 30.

Next, a process of recording and reproducing data on the card-shaped recording medium 1 by the recording / reproducing apparatus 10 configured as described above will be described with reference to FIG.

In step S1, the recording / reproducing device 10
Specifies an area for recording and reproducing data. That is,
At the time of recording, the recording / reproducing apparatus 10 reads data from the data amount of data to be recorded, the address of a recordable area obtained by reading data management information such as TOC recorded on the card-shaped recording medium 1, and the like. Specify the area for recording. At the time of reproduction, the recording / reproducing device 10 reads the TOC recorded on the card-shaped recording medium 1.
The area for reproducing data is designated from the address of the data to be reproduced obtained by reading the data management information such as.

In step S2, the recording / reproducing device 10
If the area designated by is located in the outer track 3, the process proceeds to step S3 to perform the processing. On the other hand, the recording / reproducing device 1
If the area designated by 0 is on the inner track 4, in step S4, the same continuous data recording / reproducing processing as in the related art is performed. The description of the continuous data recording / reproducing process similar to the conventional one is omitted.

In step S3, the recording / reproducing device 10
Reads data management information such as TOC recorded in the recording / reproducing area 8a or 8b of the outer peripheral track 3 by the optical pickup unit 12, and stores the resulting addresses A0, A1, A2,. The information is stored in the information table 30. That is, at the time of recording, data D0, D1, D2,..., Dn to be recorded are prepared in advance, and the recording / reproducing apparatus 10 prepares the data D0, D1,.
, An of the recordable area for recording D2,..., Dn are stored in the information table 30. At the time of reproduction, the recording / reproducing device 10 outputs the data D0, D1, and D to be reproduced.
2,..., Dn addresses A0, A1, A2,.
., An are stored in the information table 30.

In step S5, the recording / reproducing device 10
Records and reproduces data according to the address scanned by the optical pickup unit 12 on the card-shaped recording medium 1. That is, at the time of recording, the recording / reproducing apparatus 10 stores the addresses A0, A1, A2,.
When the optical pickup unit 12 scans the track of the address A0 among the addresses A0,
Is recorded on the track. At the time of reproduction, the recording / reproduction device 10 stores the addresses A0, A1, A2,.
When the optical pickup unit 12 scans, for example, the track of the address A0 among the data An, the data D0 obtained from the track is stored in association with the address A0 of the information table 30.

In step S6, the recording / reproducing device 10
Sets the flag F0 in the information table 30 when the data D0 is recorded and reproduced according to the address A0.

In step S7, the recording / reproducing device 10
Records and reproduces all data D0, D1, D2,..., Dn according to addresses A0, A1, A2,.
When all of 2,..., Fn have been set, the recording / reproducing process ends. On the other hand, the recording / reproducing device 10
If all the flags F0, F1, F2,..., Fn have not been set, the process returns to step S5 to continue the recording / reproducing process.

Next, a description will be given, with reference to FIG. 9, of a process of pulling in a servo control signal performed when the recording / reproducing apparatus 10 records data on the outer track 3 of the card-shaped recording medium 1. Here, the rotation direction R of the card-shaped recording medium 1 is rotated clockwise, the angles of the recording / reproducing regions 8a and 8b of the outer track 3 represented by the fan angle are 90 degrees, and the outer track 3 is represented by the fan angle. It is assumed that the angles of the servo pull-in areas 6a and 6b and the data end detection areas 7a and 7b are 25 degrees.

In step S11, the ON / OFF control unit 23 determines whether or not the rotation angle of the outer track 3 from the reference point k detected by the rotation angle detection unit 22 is a degrees. If it is a degree, step S
In 12, the ON / OFF control unit 23 outputs the servo control signal generated by the servo control signal generation unit 19 to the spindle motor control unit 15, the sled motor control unit 16, the tracking control unit 17, and the focusing control unit 18. I do. On the other hand, if it is not a degree, the process returns to the above-described step S11 and the processing is performed.

Next, in step S13, ON / O
The FF control unit 23 determines that the rotation angle of the outer track 3 from the reference point k detected by the rotation angle detection unit 22 is a +
It is determined whether the angle is 25 degrees (hereinafter referred to as a 'degree). If the angle is a ′, the ON / OFF control unit 23 causes the modulation unit 20 to output a signal to the optical pickup unit 12 in step S14. On the other hand, a '
If not, the process returns to step S12 to continue the process.

Next, in step S15, ON / O
The FF control unit 23 determines that the rotation angle of the outer track 3 from the reference point k detected by the rotation angle detection unit 22 is a ′.
It is determined whether the angle is +90 degrees (hereinafter referred to as c degrees). If it is c degrees, in step S16,
The ON / OFF control unit 23 includes a servo control signal generation unit 19
The servo control signal generated by the
5, sled motor control unit 16, tracking control unit 1
7. The output to the focusing control unit 18 is stopped, and the output from the modulation unit 20 to the optical pickup unit 12 is stopped. On the other hand, if it is not c degrees, the process returns to step S14 described above and the process is continued.

Next, in step S17, ON / O
The FF control unit 23 determines that the rotation angle of the outer track 3 from the reference point k detected by the rotation angle detection unit 22 is a +
It is determined whether the angle is 180 degrees (hereinafter, referred to as b degrees). If the degree is b degrees, in step S18,
The ON / OFF control unit 23 includes a servo control signal generation unit 19
The servo control signal generated by the
5, sled motor control unit 16, tracking control unit 1
7. Output to the focusing control unit 18.
On the other hand, if it has not reached b degrees, the above-described step S17
And the process is continued.

Next, in step S19, ON / O
The FF control unit 23 determines that the rotation angle of the outer track 3 from the reference point k detected by the rotation angle detection unit 22 is b +
25 (hereinafter, referred to as b ′ degree).
If it is b ′ degrees, in step S20, O
The N / OFF control unit 23 causes the modulation unit 20 to output a signal to the optical pickup unit 12. On the other hand, if it has not reached b ′, the process returns to step S18 to continue the process.

Next, in step S21, ON / O
The FF control unit 23 determines that the rotation angle of the outer track 3 from the reference point k detected by the rotation angle detection unit 22 is b ′
It is determined whether the angle is +90 degrees (hereinafter, referred to as d degrees). If it is d degrees, in step S22,
The ON / OFF control unit 23 includes a servo control signal generation unit 19
The servo control signal generated by the
5, sled motor control unit 16, tracking control unit 1
7. The output to the focusing control unit 18 is stopped, and the output from the modulation unit 20 to the optical pickup unit 12 is stopped. On the other hand, if it is not d degrees, the process returns to step S20 described above and the processing is continued.

The recording / reproducing apparatus 10 includes a card-shaped recording medium 1
While the is rotated, the above-described processes of steps S11 to S22 are repeatedly performed to draw in the servo control signal.

When the recording / reproducing apparatus 10 reproduces data from the outer track 3 of the card-shaped recording medium 1,
When the ON / OFF control unit 23 determines that the rotation angle of the outer track 3 from the reference point k detected by the rotation angle detection unit 22 is a degree and b degree, the servo control signal generation unit 19 generates The servo control signal is output to the spindle motor control unit 15, the sled motor control unit 16, the tracking control unit 17, and the focusing control unit 18. When the ON / OFF control unit 23 determines that the rotation angle of the outer track 3 from the reference point k detected by the rotation angle detection unit 22 is a ′ degree and b ′ degree, the demodulation unit 21 The reproduction signal output from the optical pickup unit 12 is converted into reproduction data.

As described above in detail, the card-shaped recording medium 1 according to the embodiment of the present invention is provided with the center hole 2 at the center position, and is rotated about the center hole 2. Thus, data is stably recorded and reproduced without the risk of displacement due to slide, and the data transfer speed does not decrease. Also, the card-shaped recording medium 1 has an outer track 3 and an inner track 4 formed therein, and the outer track 3 is formed to the very end of the card-shaped recording medium 1 in the longitudinal direction. Density and high capacity can be realized. Further, the card-shaped recording medium 1 is provided with the servo pull-in areas 6a and 6b at the position where the optical pickup section 12 enters the outer track 3, so that the servo control signal is pulled in and the arc-shaped outer circumference is formed. Data is stably recorded / reproduced on / from the track 3. In addition, the card-shaped recording medium 1
Since it is compatible with conventionally used disc-shaped recording media, it is possible to cope with applications in which disc-shaped recording media have been used.

The recording / reproducing apparatus 10 according to the embodiment of the present invention rotates the card-shaped recording medium 1 about the center hole 2 provided in the card-shaped recording medium 1 so that the card can be slid. The data can be recorded and reproduced stably without causing a positional shift of the shape recording medium 1, and the data transfer speed does not decrease. Further, the recording / reproducing apparatus 10 can use the servo pull-in areas 6a and 6b provided on the card-shaped recording medium 1 to pull in the servo control signal to stably record and reproduce data. Further, the recording / reproducing device 10
Since a driving unit used in the -Y driving system and a galvanomirror optical system used in the galvanomirror system are not required, the scale can be reduced and the cost can be reduced.
Further, the recording / reproducing apparatus 10 can use the information table 30 stored in the storage unit 24 to associate addresses with data and record / reproduce data with continuity.

It should be noted that the present invention is not limited to only the above-described embodiments, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

For example, the recording / reproducing apparatus 10 includes a storage unit 24
The address and the data are associated with each other by using the information table 30 stored in the data table. However, by using the optical system 40 as shown in FIG. Recording and reproduction can be performed while maintaining the same.

The optical system 40 is an LED for emitting a light beam.
(Light Emitting Diode) 41, mirrors 42 and 43 for converting the light beam into parallel light, and a photodetector 44 for detecting a signal from the light beam. The light beam emitted from the LED 41 is converted into parallel light by the mirror 42 and is incident on a plurality of tracks of the card-shaped recording medium 1, and is incident on the photodetector 44 via the mirror 43 as reflected light.
The photodetector 44 detects a reproduction signal from the incident light beam. Thereby, the recording / reproducing apparatus 10 can simultaneously read a plurality of tracks and perform recording / reproducing while maintaining data continuity.

The recording / reproducing apparatus 10 may verify, at the time of recording, whether or not the data has been correctly recorded, if necessary.

The recording / reproducing apparatus 10 controls the output of the servo control signal by detecting the rotation angle of the outer track 3 from the reference point k, but reproduces the data recorded on the inner track 4. Calculating the time of the missing portion of the outer track 3 passing through the optical pickup unit 12 from the rotation speed and the rotation radius of the card-shaped recording medium 1 and controlling the output of the servo control signal based on this time. Can also.

[0059]

As described above in detail, the card-shaped recording medium according to the present invention has the center of rotation provided at the center of the card, and has an arc shape on the card surface with the center of rotation as the center. An information recording area is formed, and a servo pull-in area is formed at a position where the optical pickup head enters the information recording area.

As a result, data is stably recorded and reproduced on the card-shaped recording medium without any displacement due to slide, and the data transfer speed does not decrease. Also,
The capacity of the card-shaped recording medium can be increased by the information recording area formed in an arc shape. Further, in the card-shaped recording medium, the servo control signal is pulled in by the servo pull-in area, and data is recorded and reproduced stably. Further, since the card-shaped recording medium is compatible with a conventionally used disk-shaped recording medium, it is possible to cope with an application in which the disk-shaped recording medium has been used.

In the recording / reproducing apparatus according to the present invention, the mounted card-shaped recording medium is rotated about its rotation center, and the rotation of the information recording area formed in an arc shape on the card-shaped recording medium is performed. Detects the angle, detects the servo control signal from the reflected light generated by the light beam emitted from the optical pickup head reflected on the reflective surface of the information recording area, and the rotation angle enters the servo pull-in area of the card-shaped recording medium. When the servo control signal is detected,
The position of the optical pickup head is adjusted based on the received servo control signal, the plurality of address information read from the information recording area by the light beam emitted from the optical pickup head is stored, and the card shape is formed using the plurality of address information. Write and / or read information on a recording medium.

Thus, the recording / reproducing apparatus can record / reproduce data stably without causing displacement of the card-shaped recording medium due to slide. Further, the recording / reproducing apparatus can stably record / reproduce data by pulling in the servo control signal. Further, since the recording / reproducing apparatus does not require a drive unit for sliding the card-shaped recording medium or another optical system, it is possible to reduce the scale and cost. Further, the recording / reproducing apparatus can perform recording / reproducing while maintaining data continuity by using a plurality of pieces of stored address information.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a card-shaped recording medium shown as an embodiment of the present invention.

FIG. 2 is a diagram illustrating an outer peripheral track formed in an arc shape on the card-shaped recording medium.

FIG. 3 is a diagram showing an example of a track format of an outer peripheral track formed in an arc shape on the card-shaped recording medium.

FIG. 4 is a diagram showing a positional relationship of a track format of an outer peripheral track formed in an arc shape on the card-shaped recording medium.

FIG. 5 is a diagram showing an example of an information area recorded on the card-shaped recording medium.

FIG. 6 is a diagram illustrating a schematic configuration of a recording / reproducing apparatus shown as an embodiment of the present invention.

FIG. 7 is a diagram illustrating an information table stored in a storage unit configuring the recording / reproducing apparatus.

FIG. 8 is a flowchart illustrating an operation of recording and reproducing data on a card-shaped recording medium by the recording and reproducing apparatus.

FIG. 9 is a flowchart illustrating an operation of servo control performed when the recording / reproducing apparatus records / reproduces data on a card-shaped recording medium.

FIG. 10 is a diagram illustrating an optical system used when the recording / reproducing apparatus reads a plurality of tracks simultaneously.

FIG. 11 is a diagram illustrating a card-shaped recording medium used in a conventional XY recording / reproducing apparatus.

FIG. 12 is a diagram illustrating a card-shaped recording medium used in a conventional galvanomirror recording / reproducing apparatus.

FIG. 13 is a diagram illustrating a card-shaped recording medium used in a conventional recording / reproducing apparatus using an optical system rotation system.

[Explanation of symbols]

1 card-shaped recording medium, 2 center hole, 3 outer track, 4 inner track, 5 gap area, 6
a, 6b servo pull-in area, 7a, 7b data end detection area, 8a, 8b recording / reproducing area, 10 recording / reproducing apparatus, 11 mounting section, 12 optical pickup section, 13 spindle motor, 14 thread motor, 15 spindle motor control section, 16 thread motor control unit, 17
Tracking controller, 18 focusing controller,
Reference Signs List 19 servo control signal generation unit, 20 modulation unit, 21 demodulation unit, 22 rotation angle detection unit, 23 ON / OFF control unit, 24 storage unit, 30 information table, 40 optical system, 41 LED, 42, 43 mirror, 44 light Detector

Continuation of the front page (72) Inventor Takao Ibashi 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F term (reference) 5D029 PA03 TA02 WA14 5D090 AA03 DD03 FF31 GG40 HH03

Claims (6)

[Claims] 1. A center of rotation of a card is provided at a center thereof, and an information recording area is formed on the card surface in an arc shape around the center of rotation, and an optical pickup head enters the information recording area. Card-shaped recording medium in which a servo pull-in area is formed at a position where 2. An information recording area formed in an arc around the center of rotation, wherein a part of a concentric circle or spiral around the center of rotation is missing from the card surface. The card-shaped recording medium according to claim 1, wherein: 3. An information recording area formed concentrically or spirally around the center of rotation is formed inside the information recording area formed in an arc about the center of rotation. 2. The card-shaped recording according to claim 1, wherein an area in which the information recording area is not formed is provided between the information recording area formed and the concentric or spiral information recording area. Medium. 4. A center of rotation of the card is provided with a center of rotation, an information recording area is formed on the card surface in an arc shape centered on the center of rotation, and an optical pickup head enters the information recording area. A recording / reproducing apparatus for recording and / or reproducing information on / from a card-shaped recording medium having a servo pull-in area formed at a position where the card-shaped recording medium is mounted; and a card mounted on the mounting means. Rotating means for rotating about the center of rotation of the circular recording medium, rotational angle detecting means for detecting the rotational angle of the information recording area formed in an arc on the card-shaped recording medium rotated by the rotating means, An optical pickup head that irradiates a light beam for recording and / or reproducing information with respect to the information recording area; A light beam reflected by the reflection surface of the information recording area, a servo control signal detection means for detecting a servo control signal from the reflected light generated by the reflection, and the servo angle detected by the rotation angle detection means is the servo pull-in. A servo control signal pull-in unit that pulls in the servo control signal detected by the servo control signal detection unit when entering the area; and the optical pickup head based on the servo control signal that is pulled in by the servo control signal pull-in unit. Servo driving means for adjusting the position of a plurality of pieces of address information read from an information recording area formed on the card-shaped recording medium by a light beam emitted from the optical pickup head; and Using the plurality of pieces of address information stored in the means, the information is stored in the card-shaped recording medium. Recording means for burn them, by using a plurality of address information stored in the storage means, recording and reproducing apparatus and a reproducing means for reading information from the card-like recording medium. 5. The storage means stores a plurality of pieces of information corresponding to the plurality of pieces of address information stored in the storage means in the storage means, and stores the information in an area indicated by the plurality of address information. The recording / reproducing apparatus according to claim 4, wherein a plurality of pieces of information are written. 6. The recording / reproducing apparatus according to claim 4, wherein said reproducing means reads said information from an area indicated by said plurality of address information stored in said storage means.