JPH06243623A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To shorten an average access time by holding an optical pickup to a prescribed position and driving a spindle motor at a prescribed rotational speed at a waiting time. CONSTITUTION:By the spindle motor 5, a rotary frequency signal FG is generated and outputted to a servo switching circuit 18. In the switching circuit 18, the rotational speed of the motor 5 is detected by counting a prescribed reference signal based on the signal FG at a waiting time, and a spindle servo circuit 4 is controlled so that the count value is maintained to a prescribed value. Thus, in a magneto-optical disk device 1, an optical pickup 8 is held to an intermediate position in a recordable area, and a magneto-optical disk is rotated and driven at the rotational speed corresponding to the holding position.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Conventional Technology (FIGS. 2 to 6) Problem to be Solved by the Invention (FIGS. 2 to 6) Means for Solving the Problem (FIG. 1) Action (FIG. 1) Example (1) Overall Configuration of Embodiment (FIG. 1) (2) Servo Control During Standby (FIG. 1) (3) Effect of Embodiment (4) Other Embodiment Effect of Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device, and is particularly suitable for use as an external storage device such as a computer for recording and reproducing desired data by applying a thermomagnetic recording method. .

[0003]

2. Description of the Related Art Conventionally, in a magneto-optical disk device,
Some audio data can be discretely recorded on a magneto-optical disk by recording continuous audio data in a predetermined block unit.

That is, as shown in FIG. 2, in this type of magneto-optical disk, a magnetic film is formed on a disk having a diameter of 64 [mm], so that desired data can be obtained by applying a thermomagnetic recording method. It is designed to be recordable and reproducible. In the information area, which is the data recording area, a lead-in area is formed on the innermost circumference, and PTOC data, which is management data, is recorded in the lead-in area.

That is, in this type of magneto-optical disk device, in addition to the magneto-optical disk capable of recording and reproducing, as shown in FIG. 3, the same technique as that of the compact disk is applied to reproduce only the desired data. The optical disk can also be reproduced, and the kind of this kind of disk is discriminated by the PTOC data. Further, in this type of magneto-optical disk, there is also a composite type magneto-optical disk in which a recordable and reproducible area is formed in this reproduction-only optical disk, and in this case also, the type of magneto-optical disk can be discriminated by this PTOC data. It is done like this.

In addition to this, in the PTOC data, the management data of the audio data recorded in the read-only area is recorded, so that in this type of magneto-optical disk device, the management data is used as a reference. In this way, processing such as cueing of performance and selection of music can be executed. On the other hand, a lead-out area is formed in the outermost circumference of the information area,
Thereby, the end of the information area can be detected.

On the other hand, in a recordable / reproducible magneto-optical disk, a recordable / reproducible recordable area is formed between the lead-in area and the lead-out area, and the UTOC area is provided at the innermost circumference of the recordable area. It is designed to be formed.

In this UTOC area, management data of audio data recorded in the program area, which is the remaining area of the recordable area, is recorded, so that in this type of magneto-optical disk device, the audio data is recorded. When the UTOC area is recorded, the UTOC area is updated, and at the time of the subsequent reproduction with reference to the updated UTOC data, the processing such as the beginning of the performance and the music selection is executed, and the recordable empty area is detected, and the audio data is continuously recorded. It is designed to be able to record.

As shown in FIG. 4, in the audio data recorded in the information area, continuous analog digitally converted audio data is input to the audio compression circuit, where it is blocked at a predetermined cycle and each block is input. Audio compression processing is performed in units (hereinafter, the block of this audio-compressed data is called a sound group (FIG. 4 (D)). Furthermore, in this audio data, for this sound group, 11 blocks in two consecutive two sectors are used. Are formed (FIGS. 4B and 4D), and 36 clusters form one cluster (FIG. 4A).

At this time, in each cluster, the first four clusters of one cluster are assigned to the link sector for inter-cluster connection, and the sub data is recorded in the last sector of this link sector. In the magneto-optical disk apparatus, the link sector is used to perform cross interleave processing in cluster units and error correction processing (that is, CIR processing).
C: Cross-Interleave Read-Solomon Code), whereby audio data can be recorded and reproduced in cluster units.

At the time of recording / reproducing the audio data, the magneto-optical disk device can record / reproduce the audio data via a large-capacity memory circuit.
Between this memory circuit and the magneto-optical disk, 1.4 [Mbi
While audio data is input / output at a data transfer rate of t / sec], audio data is input / output at a data transfer rate of 0.3 [Mbit / sec] between the memory circuit and the audio compression / decompression circuit. Furthermore, when inputting / outputting audio data between this memory circuit and the magneto-optical disk,
In a magneto-optical disk device, audio data is input / output in cluster units, and when a track jump occurs due to vibration or the like, the recording / reproducing operation is interrupted, the recording / reproducing position is returned to the original position, and the audio data is newly recorded at the track jumping position. Restart recording and playback of.

As a result, in this type of magneto-optical disk device, this large-capacity memory circuit is used as a buffer memory to switch the transfer rate to record / reproduce audio data, and to record / reproduce this audio data in cluster units. This makes it possible to prevent skipping of sounds.

In contrast to audio data to be recorded and reproduced as described above, PTOC data is recorded in units of sectors like audio data, and 2352 bytes are recorded in each sector as shown in the table format in FIG. It is designed to allocate data. Of these, the area represented by the vertical address “0” to “3” is allocated to the header, and the area of the vertical address “0” to “2”, 12 bytes of which is allocated to the synchronization pattern, and the subsequent vertical direction. The cluster address is assigned to the first and second bytes of the address "3".

In the PTOC of sector 0, a main data area of 2336 bytes is formed following this header, data of 00h is continuously allocated to the first 8 bytes of this area, and then a magneto-optical disk for audio. The character code (composed of the character code of MINI) indicating that is recorded in the ASII code.

Further, in the PTOC of sector 0, the identification data (Di
sc type) is assigned to identify the read-only magneto-optical disk, the recordable and reproducible magneto-optical disk, and the composite magneto-optical disk, and then the amount of light necessary for recording is determined. Data (Rec power) is recorded.

Further, in the PTOC of sector 0, the start address (Lead-out start address) of the lead-out area and the start address (Power of the area for adjusting the amount of light to be used for recording are sequentially arranged in order from the vertical address "8".
cal area start address), UTOC start address (U-TOC start address), and data area start address (Recordable user start address).

Next, in the PTOC of sector 0, in the case of the read-only and composite type magneto-optical disks, pointers (P-TNO1, ...) Of logical tracks formed in the read-only area.
…, P-TNO255) and each pointer (P-TNO1, ……, P-TNO2
55) Start address (St
The art address) and the end address are recorded.

Here, in the case of this type of magneto-optical disk, one recording track is formed in a spiral shape from the inner peripheral side to the outer peripheral side of the information area,
This one recording track is divided to form a logical track. In the magneto-optical disk for audio, in the case of a reproduction-only magneto-optical disk, this logical track is generally formed so as to correspond to each performance, and each logical track is designated by this pointer.

On the other hand, the start address (Start ad
dress) and end address, the recording start position and the recording end position of the corresponding logical track are designated on the basis of the cluster, sector, and sound group. Thus, for example, the performance of the first song is defined by the pointer P-TNO 1 which specifies the first track number.
Start address and end address of the vertical address specified by TNO 1
), The actual recording position is specified. As a result, regarding the read-only area, the magneto-optical disk device can refer to the PTOC data to find the desired performance.

On the other hand, in the magneto-optical disk capable of recording / reproducing and the composite type magneto-optical disk, UTOC data as shown in FIG. 6 is formed in the UTOC area.
Here, in the UTOC data, the management data is defined in units of sectors, and like the PTOC, the header is formed first. Next, in the UTOC data of sector 0, the address of the cluster and the data of 00h are recorded, and after the predetermined code data (Maker code, Model code) is assigned, the start track number (First TNO) of the program area and the end Last TNO
Etc. are assigned.

In the vertical address "11" of the UTOC data of the sector 0, 2 bytes of disc identification data can be recorded, and then a pointer (which indicates the position of the defective area of the main data recording area). P-DFA
), A pointer (P-EMPTY) indicating the start position of the unrecorded area of the main data recording area is assigned. In the subsequent vertical address "12", a pointer (P-FRA) indicating the start position of each audio data recorded in the program area is assigned,
Subsequently, a pointer (P-TNO1, ..., P-TNO255) indicating the recording start position of each audio data is assigned.

Further, this pointer (P-TNO1, ..., P-TN
O255) followed by a set of start addresses (Start
address) and end address (End address) are assigned, and this start address (Start addres
s) and a recording unit defined by an end address, a link pointer (Link-P) indicating the connection relationship is assigned.

Thus, in the magneto-optical disk device for recording and reproducing the audio signal, the pointer (P-FRA
, P-TNO1, ......, P-TNO255) for the first recording unit of each performance, the corresponding start address (Star
t address) and end address (End address) after playing the recording unit, end address (End address)
When the link pointer (Link-P) is set following the, the start address (Start address) and end address (En specified by this link pointer (Link-P)
d address) recording unit is adapted to be reproduced.

On the other hand, at the time of recording, in the magneto-optical disk device, the start address (Start address) and end address (En) specified by the pointer (P-EMPTY) are set.
After recording audio data for d address),
The start address (End address) and the end address (End address) of the recordable area that is followed by the link pointer (Link-P) that follows this end address (End address)
) Are sequentially detected. As a result, in the magneto-optical disc device, recording and erasing can be repeated to record discretely continuous performances in the recordable and reproducible areas discretely formed on the magneto-optical disc.
Further, the performance recorded discretely in this way can be surely reproduced.

Therefore, in this type of magneto-optical disk device, when the magneto-optical disk is loaded and the power is turned on, the optical pickup is first moved to the lead-in area to reproduce the PTOC, UT as needed
The OC is played back, so that the management data in the program area is played back first. Further, in the magneto-optical disk device, the management data thus reproduced is stored and held in a predetermined memory circuit, and the optical pickup is held in the innermost circumference of the program area and stands by. When the operator for starting the reproduction is pressed and scanned, the audio data is sequentially reproduced based on the management data stored in the memory circuit.

[0026]

By the way, it would be convenient if various types of data could be recorded and reproduced by using this type of magneto-optical disk device as an external storage device of a computer. For this purpose, it is necessary to be able to access a desired recording area in a short time.

Particularly, in this type of magneto-optical disk device, when the magneto-optical disk is loaded, the management data consisting of UTOC data and PTOC data is read out and the optical pickup is held at this position. For example, when accessing from this position, there is a problem that the access time increases step by step when accessing the recordable area on the outer circumference side, compared to when accessing the recordable area on the inner circumference side. That is, in order to record and reproduce various data by using this type of magneto-optical disk device as an external storage device of a computer, it is necessary not only to simply shorten the access time but also to shorten the average access time. is there.

Further, in this type of magneto-optical disk device, when the recording / reproducing operation is stopped, the spindle motor is controlled to be stopped, so that when it is simply applied to the external storage device of the computer, the rotation speed of the spindle motor is changed. The access time also increases depending on the startup time. Furthermore, in this type of magneto-optical disk, it is necessary to drive under the condition that the linear velocity is constant, and the rotation speed of the magneto-optical disk must be greatly changed according to the position to be accessed. Not only the time needs to be shortened, but also the average access time needs to be shortened.

The present invention has been made in consideration of the above points, and an object thereof is to propose a magneto-optical disk device capable of shortening the average access time.

[0030]

In order to solve such a problem, according to the present invention, a disk-shaped recording medium 2 having a spiral recording track formed in a recording area is rotationally driven at a constant linear velocity so that the recording track is formed. In the magneto-optical disk device 1 for accessing and recording / reproducing desired data, the disk-shaped recording medium 2 forms a management information recording area for recording management information on the inner circumference of the recording area, and the outer circumference of the management information recording area. The magneto-optical disk device 1 forms a data recording area for recording data, and the magneto-optical disk device 1 irradiates the disk-shaped recording medium 2 with a light beam and the rotation driving means 3, 4, 5 for rotating the disk-shaped recording medium 2. And an optical pick-up moving means 3, 6 and 7 for moving the optical pick-up 8 in the radial direction of the disk-shaped recording medium 2. Comprising, an optical pickup moving means 3,6,7 is standby, holds the optical pickup 8 to a predetermined standby position, to select the position to be irradiated on substantially intermediate position of the optical beam data recording area to the standby position.

Further, in the second invention, the disk-shaped recording medium 2 having helically formed recording tracks in the recording area is rotationally driven at a constant linear velocity, and the recording tracks are accessed to record / reproduce desired data. In the magneto-optical disk device 1, the disk-shaped recording medium 2 forms a management information recording area for recording management information on the inner circumference of the recording area,
A data recording area for recording data is formed on the outer periphery of the management information recording area, and the magneto-optical disk device 1 is provided on the disk-shaped recording medium 2 and the rotation driving means 3, 4, 5 for rotationally driving the disk-shaped recording medium 2. An optical pick-up 8 for irradiating a light beam to record / reproduce data on / from a recording medium, and an optical pick-up moving means 3, 6, 7 for moving the optical pick-up 8 in the radial direction of the disk-shaped recording medium 2 are provided. The means 3, 6, 7 hold the optical pickup 8 at a predetermined standby position during standby, and when the recording track in the data recording area is accessed by irradiating a light beam at the standby position, the inner peripheral side of the access position is reached. The standby position is set to a position where the data amount is substantially equal in the data recording area of the data recording area and the data recording area on the outer peripheral side of the access position.

Further, according to the third aspect of the invention, the disk-shaped recording medium 2 having helically formed recording tracks in the recording area is rotationally driven at a constant linear velocity, and the recording tracks are accessed to record / reproduce desired data. In the magneto-optical disk device 1, the disk-shaped recording medium 2 forms a management information recording area for recording management information on the inner circumference of the recording area,
A data recording area for recording data is formed on the outer periphery of the management information recording area, and the magneto-optical disk device 1 is provided on the disk-shaped recording medium 2 and the rotation driving means 3, 4, 5 for rotationally driving the disk-shaped recording medium 2. An optical pick-up 8 for irradiating a light beam to record / reproduce data on / from a recording medium, and optical pick-up moving means 3, 6, 7 for moving the optical pick-up 8 in the radial direction of the disk-shaped recording medium 2 are provided. The disks 3, 4 and 5 rotationally drive the disk-shaped recording medium 2 at a rotational speed at the time of recording / reproducing data at a substantially intermediate position of the data recording area during standby.

Further, in the fourth aspect of the invention, the disk-shaped recording medium 2 in which the recording tracks are spirally formed in the recording area is rotationally driven at a constant linear velocity, and the recording tracks are accessed to record / reproduce desired data. In the magneto-optical disk device 1, the disk-shaped recording medium 2 forms a management information recording area for recording management information on the inner circumference of the recording area,
A data recording area for recording data is formed on the outer periphery of the management information recording area, and the magneto-optical disk device 1 is provided on the disk-shaped recording medium 2 and the rotation driving means 3, 4, 5 for rotationally driving the disk-shaped recording medium 2. An optical pick-up 8 for irradiating a light beam to record / reproduce data on / from a recording medium, and optical pick-up moving means 3, 6, 7 for moving the optical pick-up 8 in the radial direction of the disk-shaped recording medium 2 are provided. Nos. 3, 4 and 5 were changed from the rotational speed at the time of recording / reproducing data at an almost intermediate position of the data recording area at the time of standby according to the acceleration / deceleration characteristics for accelerating / decelerating the rotational speed of the disk-shaped recording medium 2. The disk-shaped recording medium 2 is rotationally driven at the rotational speed.

Further, in the fifth aspect of the invention, the disk-shaped recording medium 2 in which the recording tracks are spirally formed in the recording area is rotationally driven at a constant linear velocity, and the recording tracks are accessed to record and reproduce desired data. In the magneto-optical disk device 1, the disk-shaped recording medium 2 forms a management information recording area for recording management information on the inner circumference of the recording area,
A data recording area for recording data is formed on the outer periphery of the management information recording area, and the magneto-optical disk device 1 is provided on the disk-shaped recording medium 2 and the rotation driving means 3, 4, 5 for rotationally driving the disk-shaped recording medium 2. An optical pick-up 8 for irradiating a light beam to record / reproduce data on / from a recording medium, and optical pick-up moving means 3, 6, 7 for moving the optical pick-up 8 in the radial direction of the disk-shaped recording medium 2 are provided. When the data recording area is divided into an inner peripheral side area and an outer peripheral side area during standby, data is placed at a position where the data amount is substantially equal in the inner peripheral side area and the outer peripheral side area. The disk-shaped recording medium 2 is rotationally driven at the rotational speed for recording and reproducing.

Further, in the sixth aspect of the invention, the disk-shaped recording medium 2 in which the recording tracks are spirally formed in the recording area is rotationally driven under the condition of a constant linear velocity, and the recording tracks are accessed to record and reproduce desired data. In the magneto-optical disk device 1, the disk-shaped recording medium 2 forms a management information recording area for recording management information on the inner circumference of the recording area,
A data recording area for recording data is formed on the outer periphery of the management information recording area, and the magneto-optical disk device 1 is provided on the disk-shaped recording medium 2 and the rotation driving means 3, 4, 5 for rotationally driving the disk-shaped recording medium 2. An optical pick-up 8 for irradiating a light beam to record / reproduce data on / from a recording medium, and optical pick-up moving means 3, 6, 7 for moving the optical pick-up 8 in the radial direction of the disk-shaped recording medium 2 are provided. When the data recording area is divided into an inner peripheral side area and an outer peripheral side area during standby, data is placed at a position where the data amount is substantially equal in the inner peripheral side area and the outer peripheral side area. The disk-shaped recording medium 2 is rotationally driven at a rotational speed that is changed according to the acceleration / deceleration characteristic of accelerating / decelerating the rotational speed of the disk-shaped recording medium 2 from the rotational speed at the time of recording / reproducing.

Further, in the seventh invention, the optical pick-up moving means 3, 6, 7 are set at positions corresponding to the rotational speed at which the rotational driving means 3, 4, 5 rotationally drive the disk-shaped recording medium 2 during standby. The optical pickup 8 is held.

[0037]

Operation: During standby, the optical pick-up 8 is at the predetermined standby position.
Hold, and select a position for irradiating the light beam to an almost intermediate position of the data recording area as the standby position, and instead of this, when irradiating the light beam at the standby position to access the recording track of the data recording area, If the position where the data recording area on the inner circumference side and the data recording area on the outer circumference side of the access position are substantially equal to each other is selected as the standby position, the seek time of the optical pick-up 8 can be averaged accordingly.

In the standby state, the disk-shaped recording medium 2 is rotationally driven at a rotational speed at which data is recorded / reproduced at an almost intermediate position of the data recording area, and the data recording area is an inner peripheral area and an outer peripheral area. When divided into, the disk-shaped recording medium 2 is rotationally driven at the rotational speed at which data is recorded and reproduced at a position where the data amount is substantially equal in the inner peripheral area and the outer peripheral area. The disk-shaped recording medium 2 is rotationally driven at the rotational speed changed according to the acceleration / deceleration characteristic for accelerating / decelerating the rotational speed of the medium 2, and the time required for switching the rotational speed of the recording medium 2 during seek is averaged. obtain.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall Configuration of the Embodiment In FIG. 1, reference numeral 1 denotes a magneto-optical disk device as a whole, and when the magneto-optical disk 2 is loaded, PTOC data is read from the read area of the magneto-optical disk 2. After that, the UTOC data is read from the UTOC area as needed.

That is, in the magneto-optical disc device 1, when the magneto-optical disc 2 having a diameter of 64 mm is loaded,
A control command is sent from the system controller 3 to the spindle servo circuit 4, whereby the spindle servo circuit 4 drives the spindle motor 5, and the magneto-optical disk 2 is rotationally driven at a predetermined rotational speed.

Subsequently, in the magneto-optical disk device 1,
From system controller 3 to tracking servo circuit 6
A control command is output to drive the feed motor 7 to move the optical pickup 8 to the lead-in area of the magneto-optical disc 2. When the optical pickup 8 is moved in this way, in the magneto-optical disc device 1, the system controller 3 sends a control command to the focus servo circuit 9 and the tracking servo circuit 6 to drive the optical pickup 8. Thus, the magneto-optical disc 2 is irradiated with a light beam, and in this state, the reflected light obtained from the magneto-optical disc 2 is received by the optical pickup 8.

As a result, in the optical pickup 8, a focus error signal is generated based on the light receiving result, and this focus error signal is amplified by the RF amplifier 10 and output to the servo switching circuit 18. The servo switching circuit 18 outputs the focus error signal to the focus servo circuit 9, whereby the magneto-optical disc device 1 can perform focusing control.

Further, the RF amplifier 10 generates a tracking error signal from the output signal of the optical pickup 8 and outputs the tracking error error signal to the tracking servo circuit 6 via the servo switching circuit 18. Thus, in the magneto-optical disk device 1, the optical pickup 8 can be controlled to be tracked.

Further, in the optical pickup 8, the light reception result is amplified by the RF amplifier 8 and binarized, and then output to the address decoder 11, whereby the address decoder 11 outputs the light beam irradiation position based on the light reception result. Detects the location information of. That is, in this type of magneto-optical disk 2, a meandering pre-groove is formed in the recordable area in advance, so that the signal level of the light reception result of the optical pickup 8 changes following the meandering of the pre-groove. Has been done.

As a result, in the magneto-optical disk 2,
With respect to this light reception result, the center frequency of the change in the signal level can be detected to detect the rotation speed information of the magneto-optical disk 2, and the spindle motor 5 is driven so that this frequency becomes 22.05 [KHz]. , Magneto-optical disk 2
The rotation speed can be controlled under the condition that the specified linear velocity is constant. Further, in the magneto-optical disk 2, the center frequency is set to 22.0 for the change in the signal level of the light reception result.
The position information of the light beam irradiation position can be detected by setting the frequency to 5 [KHz] and applying the FM demodulation method to detect the frequency transition from the center frequency.

On the other hand, in the reproduction-only area,
By forming the pits and recording the data, the spindle motor 5 is driven so that the signal level of the light receiving result changes at the fundamental frequency of 4.3218 [MHz], and the magneto-optical disk 2 is operated under the condition of the constant linear velocity. It is possible to control the rotation with, and to detect the reproduction position information based on the reproduction result.

Based on this detection principle, the address decoder 11 detects the position information of the light beam irradiation position, and the detected position information is encoded / decodered by the encoder / decoder 12.
To the system controller 3 via. As a result, the magneto-optical disk device 1 can record data on a desired recording track or reproduce data from a desired recording track on the basis of this position information.

On the other hand, in the RF amplifier 10,
The rotation speed information FS is detected based on the light reception result of the optical pickup 8, and this rotation speed information FS is output to the spindle servo circuit 6 via the servo switching circuit 18.
As a result, in the magneto-optical disk device 1, the magneto-optical disk 2 can be driven under the condition that the predetermined linear velocity is constant.

When the recording data in which the PTOC data is recorded based on the position detection result of the address decoder 11 can be reproduced as described above, the RF amplifier 10 in the magneto-optical disk device 1 is activated.
Output signal to the encoder / decoder 12. Here, in the encoder / decoder 12, the operation is switched between the recording mode and the reproduction mode, and in the reproduction mode, the output signal of the RF amplifier 10 is sequentially demodulated to obtain demodulated data, and the demodulated data is subjected to error correction processing and deinterleave. To process.

This error correction processing is performed on the basis of the CIRC error correction code added and recorded to the reproduction data and the like. Therefore, in this type of magneto-optical disk device, this error correction code is recorded. Is added to record data. In this way PTO
When the PTOC data is reproduced from the C area, in the magneto-optical disk device 1, a predetermined memory controller is controlled to store the necessary PTOC data in the memory circuit 13 having the random access memory circuit configuration.

When the PTOC data is read in this way, the PTOC data is read by the system controller 3.
The type of the magneto-optical disk 2 is discriminated based on the identification data attached to the data. At this time, when the magneto-optical disk 2 is a recordable magneto-optical disk, the system controller 3 subsequently outputs a control command to the tracking servo circuit 6 and the spindle servo circuit 4 to output the UTOC.
The area is accessed and the UTOC data is reproduced and stored in the memory circuit 13.

As a result, in the magneto-optical disk device 1, the PTOC data and the UTOC data, which are management data of the data recorded in the program area, are reproduced in advance and stored in the memory circuit 13, and then based on the PTOC data and the UTOC data. Then, desired data can be reproduced from the program area and desired data can be recorded in the program area.

That is, when the loaded magneto-optical disk 2 is a magneto-optical disk for audio, the system controller 3 switches the entire operation mode to the audio data recording / reproducing mode, and the audio compression / expansion circuit 1
4. Switch the analog digital / digital analog conversion circuit (AD / DA) 15 to the operating state.

When the user sets the recording mode of the audio signal in this state, the analog digital / digital analog conversion circuit (AD / DA) 15 outputs the sequentially input audio signal A1 at a sampling frequency of 44.1 [KH].
z], it is converted into a digital signal having a quantization bit number of 16 bits and output, and the audio compression / expansion circuit 14 performs audio compression processing of this digital signal in a predetermined cycle unit to form a sound group. In this audio compression, the modified DCT
(Modified deiscreat cosine toransform) is applied to compress audio data.

On the other hand, in the memory circuit 13,
A large-capacity memory is allocated so as to store up to 3 seconds of audio data when converted to the audio signal A1, and the audio data output from the audio compression / expansion circuit 14 is temporarily stored and sequentially encoded in cluster units. /
Output to the decoder 12. In the encoder / decoder 12, after the audio data is interleaved and an error correction code is added, it is modulated by a modulation method suitable for recording of a magneto-optical disk (that is, 8-14 modulation which is EFM modulation), The resulting recording data is output to the head drive circuit 16.

At this time, in the system controller 3, the feed motor 7 is driven through the tracking servo circuit 6 based on the UTOC data detected in advance, so that the optical pickup 8 and the magnetic head 17 are recorded in the unrecorded area. Move to. As a result, in the magneto-optical disk device 1, the head drive circuit 1 is selected according to the recording data.
6. The magnetic head 17 is driven, and the modulating magnetic field formed by the magnetic head 17 is applied to the magneto-optical disk 2.

In this state, in the magneto-optical disk device 1, a light beam is intermittently radiated to the application position of the modulation magnetic field by the optical pickup 8 to apply the thermomagnetic recording technique to the high-density audio data. It is designed to be able to record. Further, in the magneto-optical disk device 1, the reflected light of this light beam is detected by the optical pickup 8 and the detection result is output to the address decoder 11 via the RF amplifier 10, whereby the address decoder 11 outputs it. The position information of each recording area is detected. As a result, in the magneto-optical disc device 1, audio data can be sequentially recorded in a desired recording area based on the position information detection result.

At the time of this recording, in the encoder / decoder 12 of the magneto-optical disk device 1, a header is added to the audio data of the sound group to form a sector, and a cluster is formed in this sector. It is designed to record audio data in cluster units. On the other hand, in the system controller 3, when audio data is recorded,
The UTOC data of the memory circuit 13 is updated, and when the magneto-optical disk device 1 ejects the magneto-optical disk 2 and when the power is cut off, the UTOC area of the magneto-optical disk 2 is updated with the updated UTOC data. .

As a result, in the magneto-optical disk device 1, the UT corresponds to the recording / erasing operation of the magneto-optical disk 2.
The OC area is updated so that the recordable area management data can be surely recorded.

On the other hand, in the audio data reproducing mode, in the magneto-optical disc device 1, the light quantity of the light beam output from the optical pickup 8 is reduced and the magneto-optical disc 1 is reproduced as in the case of reproducing the lead-in area. By detecting a change in the plane of polarization of the reflected light obtained from the disk 2, the Kerr effect is utilized to reproduce the recorded data on the magneto-optical disk 2. That is, in the magneto-optical disk device 1, the output signal of the RF amplifier 10 is demodulated by the encoder / decoder 12 and subjected to error correction processing, and then output to the memory circuit 13.

Here, in the magneto-optical disk device 1,
As in the case of recording, the memory circuit 13 is used as a buffer memory, and the reproduced audio data is output to the audio compression / expansion circuit 14 for audio expansion processing. As a result, in the magneto-optical disc device 1, the audio compression / decompression circuit 14 demodulates the audio data into a digital audio signal, and then outputs it in the form of an analog signal via the analog digital / digital analog conversion circuit 15. There is.

On the other hand, when the host computer 20 is connected and data is recorded as an external storage device of the host computer 20, the magneto-optical disk device 1 stores the data in the host computer 20 in the buffer memory 21 via the SCSI interface. The output data D1 is stored. At this time, in the system controller 3,
A write command corresponding to the output data D1 is input in advance from the host computer 20 via the buffer memory 21, whereby the recordable area is detected by referring to the UTOC data corresponding to the write command, The optical pickup 8 and the magnetic head 17 are moved to this recordable area.

In the encoder / decoder 22, this output data D1 is blocked in predetermined data units,
Further, by adding an error correction code to the block data, the output data D1 is sequentially output to the memory circuit 13 in data units corresponding to the sectors of the audio data. Therefore, in the magneto-optical disk device 1,
This data is output from the memory circuit 13 to the encoder / decoder 12 in the same manner as when the audio data is recorded, where interleave processing and error correction code generation processing are executed in cluster units and converted into recording data.

At this time, in the system controller 3, the operations of the encoder / decoder 12 and the memory circuit 13 are switched as necessary, whereby the unit of data to be interleaved is switched and the number of sectors per cluster is changed as necessary. It is designed to switch.

Thus, in the magneto-optical disk device 1, even when the magneto-optical disk device 1 is used as an external storage device of the host computer 20 in which the amount of data changes, the recording area of the magneto-optical disk 2 can be efficiently used to record / reproduce data. It is done like this. When recording data in this way, the system controller 3 updates the UTOC data of the memory circuit 13 in the same manner as when recording audio data.
The UTOC area of the magneto-optical disk 2 is updated with the OC data so that the management data can be surely recorded.

On the other hand, when reproducing the data recorded in this way, the encoder / decoder 12 operates in the same manner as at the time of reproducing the audio data and performs error correction processing and deinterleave processing on the reproduced data in cluster units. Then, in the encoder / decoder 22, the reproduction data stored in the memory circuit 13 is subjected to error correction processing in reverse to the recording operation, and is output. At this time, the system controller 3 detects the recording position of the data desired by the host computer 20 by searching the UTOC data of the memory circuit 13 in response to the command issued from the host computer 20, and detects the magneto-optical disk. Play 2.

On the other hand, in the buffer memory 21, the output data of the encoder / decoder 22 is accumulated and output in response to the operation of the host computer 20. As a result, in the magneto-optical disk apparatus 1, the external data such as the computer 20 is output. It is designed to be used as a storage device to record and reproduce various data.

(2) Servo control during standby Data D as an external storage device of the host computer 20.
In the case of recording / reproducing 1, the servo control is switched in the magneto-optical disk device 1 during standby to hold the optical pickup 8 at a predetermined position and rotate the spindle motor 5 at a predetermined rotation speed. Is designed to reduce the average access time.

That is, in the servo switching circuit 18 and the spindle servo circuit 4, during data recording / reproduction,
Based on the rotational speed information FS, which is obtained by detecting the basic frequency of the pre-groove meander or the basic frequency of the pit forming period, which is output from the RF amplifier 10, these frequencies are respectively determined.
A phase comparison result is obtained with a predetermined reference signal so as to be 22.05 [kHz] and 4.3218 [MHz], and the spindle motor 5 is driven based on this phase comparison result. As a result, in the magneto-optical disk device 1, the rotational speed information FS obtained from the magneto-optical disk 2 at the time of recording / reproducing data.
The magneto-optical disk 2 is driven under the condition of constant linear velocity.

On the other hand, in the system controller 3, the operation of the servo switching circuit 18 is switched when it is not in the recording / reproducing of data and it is judged as the standby state. In response to this, the servo switching circuit 18 controls the tracking servo circuit 6 to move the optical pickup 8 to the intermediate position of the recordable area, and then stops the tracking control, whereby the magneto-optical disk device 1 In, the optical pickup 8 is held at the intermediate position of the recordable area.

At the same time, in the servo switching circuit 18, the focus servo circuit 9 is stopped and the irradiation of the light beam is stopped, so that the power consumption of the magneto-optical disk device 1 is reduced as a whole. Further, the heat generation in the device is reduced to extend the life of the laser diode of the optical pickup 8 which emits a light beam.

On the other hand, in this embodiment, the spindle motor 5 is adapted to generate the rotation frequency signal FG whose signal level rises every time it rotates by a predetermined angle.
The rotation frequency signal FG is output to the servo switching circuit 18. In the servo switching circuit 18, during standby,
By counting a predetermined reference signal based on the rotation frequency signal FG, the rotation speed of the spindle motor 5 is detected, and the spindle servo circuit 6 is controlled so that this count value is maintained at a predetermined value.

As a result, in the magneto-optical disk device 1, the optical pickup 8 is held at the intermediate position of the recordable area, and the magneto-optical disk 2 is rotationally driven at the rotation speed corresponding to the holding position. At the time of subsequent access, the control reference of the spindle motor is switched from the rotation frequency signal FG to the rotation speed information FS so that the required rotation speed can be switched in a short time. Therefore, the time required for access can be averaged, and the average access time can be shortened.

Further, in the magneto-optical disk device 1,
By holding the optical pickup 8 at the intermediate position of the recordable area, the time required for the subsequent seek can be averaged, and the average access time can be shortened accordingly.

(3) Effects of the Embodiments According to the above-described structure, the optical pickup 8 is held at the intermediate position of the recordable area during standby, and the magneto-optical disk is driven to rotate at the rotation speed corresponding to this holding position. By doing so, the time required for switching the rotational speeds of the seek and the magneto-optical disk can be averaged, and the average access time can be shortened accordingly.

(4) Other Embodiments In the above embodiment, the optical pickup 8 is held at the intermediate position of the recordable area and the magneto-optical disk is driven to rotate at the rotation speed corresponding to this holding position. However, the present invention is not limited to the physical intermediate position, and holds the optical pickup 8 at a position where the amount of data in the recordable area becomes 1/2, and the holding position. The magneto-optical disk may be driven to rotate at a rotation speed corresponding to.

Further, in this type of magneto-optical disk device, even when the rotational speed of the magneto-optical disk is varied within the same range, the time required for acceleration / deceleration differs depending on whether acceleration or deceleration is performed. Depending on the acceleration / deceleration characteristics of, the holding position of the optical pickup 8 is set to the intermediate position,
Further, the magneto-optical disk may be held at a position changed from the position where the data amount is halved, and the magneto-optical disk may be rotationally driven at a rotational speed corresponding to this.

Further, in the above-mentioned embodiment, the case where the magneto-optical disk is rotationally driven at the rotational speed corresponding to the holding position of the optical pickup 8 has been described, but the present invention is not limited to this, and the optical pickup may be driven as necessary. 8 may be held at an intermediate position, a position where the amount of data is halved, and the like. Further, the optical pick-up 8 is held at the rotational speed when the optical pickup 8 is held at such a position by the rotational speed of the magneto-optical disk. You may do it.

Further, in the above-described embodiment, the case where the spindle motor is rotationally controlled in the standby state on the basis of the rotation frequency signal whose signal level rises when the spindle motor rotates by a predetermined angle has been described. Not limited to this, for example, the spindle motor may be rotationally controlled during standby based on a rotation reference signal whose signal level rises when the spindle motor makes one rotation.

Further, not only when controlling the rotation of the spindle motor based on the rotation speed as described above, but when the rotation speed of the spindle motor is uniquely determined with respect to the applied voltage, an open loop control circuit is formed. The spindle motor may be controlled to rotate.

[0082]

As described above, according to the present invention, when waiting,
By holding the optical pickup at an intermediate position of the data recording area, a position where the amount of data is halved, etc., and rotating the magneto-optical disk at the rotation speed when the optical pickup is held at such a position, It is possible to obtain a magneto-optical disk device capable of shortening the average access time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a magneto-optical disk device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a recordable / reproducible magneto-optical disk.

FIG. 3 is a perspective view showing a magneto-optical disk for reproduction only.

FIG. 4 is a schematic diagram for explaining the structure of audio data processed by a magneto-optical disk device.

FIG. 5 is a diagram for explaining UTOC.

FIG. 6 is a diagram for explaining a PTOC.

[Explanation of symbols]

1 ... Magneto-optical disk device, 2 ... Magneto-optical disk, 3
...... System controller, 4 ...... Spindle servo circuit, 5 ...... Spindle motor, 6 ...... Tracking servo circuit, 8 ...... Optical pickup, 9 ...... Focus servo circuit, 18 ...... Servo switching circuit, 20 ...... Host computer.

Claims (7)

[Claims] 1. A magneto-optical disk apparatus for rotatably driving a disk-shaped recording medium having helically formed recording tracks in a recording area under a condition of constant linear velocity, and accessing the recording tracks to record and reproduce desired data. In the disk-shaped recording medium, a management information recording area for recording management information is formed on the inner circumference of the recording area, and a data recording area for recording the data is formed on the outer circumference of the management information recording area. The magnetic disk device includes a rotation driving means for rotating the disk-shaped recording medium, an optical pickup for irradiating the disk-shaped recording medium with a light beam to record / reproduce the data on / from the recording medium, and the optical pickup. An optical pick-up moving means movable in the radial direction of the disk-shaped recording medium, wherein the optical pick-up moving means is on standby. At this time, the magneto-optical disk device is characterized in that the optical pickup is held at a predetermined standby position, and a position for irradiating the light beam to a substantially intermediate position of the data recording area is selected as the standby position. 2. A magneto-optical disk apparatus for rotatably driving a disk-shaped recording medium having helically formed recording tracks in a recording area under conditions of constant linear velocity, and accessing the recording tracks to record and reproduce desired data. In the disk-shaped recording medium, a management information recording area for recording management information is formed on the inner circumference of the recording area, and a data recording area for recording the data is formed on the outer circumference of the management information recording area. The magnetic disk device includes a rotation driving unit that rotationally drives the disk-shaped recording medium, an optical pickup that irradiates the disk-shaped recording medium with a light beam to record and reproduce the data on the recording medium, and the optical pick-up. An optical pick-up moving means movable in the radial direction of the disk-shaped recording medium, wherein the optical pick-up moving means is on standby. At this time, when the optical pickup is held at a predetermined standby position and the recording track of the data recording area is accessed by irradiating a light beam at the standby position, the data recording area on the inner peripheral side of the access position and the data recording area A magneto-optical disk device characterized in that a position where the data amount is substantially equal to the data recording area on the outer peripheral side of the access position is selected as the standby position. 3. A magneto-optical disk device for rotatably driving a disk-shaped recording medium having helically formed recording tracks in a recording area under a condition of constant linear velocity, and accessing the recording tracks to record and reproduce desired data. In the disk-shaped recording medium, a management information recording area for recording management information is formed on the inner circumference of the recording area, and a data recording area for recording the data is formed on the outer circumference of the management information recording area. The magnetic disk device includes a rotation driving unit that rotationally drives the disk-shaped recording medium, an optical pickup that irradiates the disk-shaped recording medium with a light beam to record and reproduce the data on the recording medium, and the optical pick-up. An optical pick-up moving means movable in a radial direction of the disk-shaped recording medium, wherein the rotation driving means is in a standby state, A magneto-optical disk device, characterized in that the disk-shaped recording medium is rotationally driven at a rotational speed at the time of recording / reproducing the data at a substantially intermediate position of a data recording area. 4. A magneto-optical disk device for rotatably driving a disk-shaped recording medium having a spiral recording track formed in a recording area under a constant linear velocity, and accessing the recording track to record and reproduce desired data. In the disk-shaped recording medium, a management information recording area for recording management information is formed on the inner circumference of the recording area, and a data recording area for recording the data is formed on the outer circumference of the management information recording area. The magnetic disk device includes a rotation driving means for rotating the disk-shaped recording medium, an optical pickup for irradiating the disk-shaped recording medium with a light beam to record / reproduce the data on / from the recording medium, and the optical pickup. An optical pick-up moving means movable in a radial direction of the disk-shaped recording medium, wherein the rotation driving means is in a standby state, The disk-shaped recording medium is rotated at a rotational speed that is changed in accordance with the acceleration / deceleration characteristic of accelerating / decelerating the rotational speed of the disk-shaped recording medium from the rotational speed when the data is recorded / reproduced at approximately the middle position of the recording area. A magneto-optical disk device characterized by being driven. 5. A magneto-optical disk apparatus for rotatably driving a disk-shaped recording medium having helically formed recording tracks in a recording area under a condition of constant linear velocity, and accessing the recording tracks to record and reproduce desired data. In the disk-shaped recording medium, a management information recording area for recording management information is formed on the inner circumference of the recording area, and a data recording area for recording the data is formed on the outer circumference of the management information recording area. The magnetic disk device includes a rotation driving means for rotating the disk-shaped recording medium, an optical pickup for irradiating the disk-shaped recording medium with a light beam to record / reproduce the data on / from the recording medium, and the optical pickup. An optical pick-up moving means movable in a radial direction of the disk-shaped recording medium, wherein the rotation driving means is in a standby state, When the data recording area is divided into an inner area and an outer area, the rotation speed at the time of recording / reproducing the data at the position where the data amount is almost equal in the inner area and the outer area. A magneto-optical disk device, which drives the disk-shaped recording medium to rotate. 6. A magneto-optical disk device for rotatably driving a disk-shaped recording medium having helically formed recording tracks in a recording area under a condition of constant linear velocity, and accessing the recording tracks to record and reproduce desired data. In the disk-shaped recording medium, a management information recording area for recording management information is formed on the inner circumference of the recording area, and a data recording area for recording the data is formed on the outer circumference of the management information recording area. The magnetic disk device includes a rotation driving unit that rotationally drives the disk-shaped recording medium, an optical pickup that irradiates the disk-shaped recording medium with a light beam to record and reproduce the data on the recording medium, and the optical pick-up. An optical pick-up moving means movable in a radial direction of the disk-shaped recording medium, wherein the rotation driving means is in a standby state, When the data recording area is divided into an inner area and an outer area, the rotation speed when recording and reproducing the data at the position where the data amount is almost equal in the inner area and the outer area A magneto-optical disk device, wherein the disk-shaped recording medium is rotationally driven at a rotational speed that is changed according to an acceleration / deceleration characteristic of accelerating / decelerating the rotational speed of the disk-shaped recording medium. 7. The optical pick-up moving means holds the optical pick-up at a position corresponding to a rotational speed at which the rotational driving means rotationally drives the disk-shaped recording medium during standby. 7. The magneto-optical disk device according to claim 4, claim 5, or claim 6.