JPH05298862A - Optical disk device - Google Patents

Abstract

PURPOSE:To maintain a still state (on-track state) even through an optical disk having a track whose length by one track is different from the physical length of one revolution in a circumferential direction. CONSTITUTION:This device is constituted so that when present address data ADRn read by an optical pickup 21 and target address data ADRt are compared by a comparator circuit 43, a track number, in addition to a sector number is compared and the optical pickup 21 is returned by one track in the inner circumferential direction Ri of an optical disk 11 when they coincide. Thus, even though the recording format of the optical disk 11 is made so as to have the track whose length by one track is different from the physical length of one revolution in the circumferential direction, the static state is maintained surely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device capable of maintaining a stationary state.

[0002]

2. Description of the Related Art In an optical disc apparatus, an optical pickup is moved in a radial direction from an inner peripheral side to an outer peripheral side with respect to an optical disc rotated by a spindle motor, thereby recording information recorded on the optical disc. The signal is read by the optical pickup.

In such an optical disk device, it is necessary to perform a so-called stationary state (on-track state) maintaining operation of repeatedly reproducing an information signal recorded on a specific one track. Here, the stationary state maintaining operation refers to moving the optical pickup radially inward by one track when the optical disk rotates one track (one rotation) while performing a reproducing operation by the optical pickup. By controlling to, the optical pickup stands by on the same track.

FIG. 5 shows an example of a recording format of a general magneto-optical disk among optical disks. In this magneto-optical disk 1, the recording grooves are arranged spirally from the inner peripheral side to the outer peripheral side in the radial direction R.

However, although it has a spiral shape,
One lap is called one track, and the track number "○"
“T” is 0T, 1T, ..., 10T, 11T, in order from the inner circumference.
It is attached like ....

Further, each track is divided into sectors S at equal angular intervals, and a sector number ".smallcircle.S" (see, for example, FIG. 5).
As shown in FIG. 5, 0S to 5S) are sequentially added in the clockwise direction.

Here, each arbitrary sector S is composed of a header H and data D. Among them, in the header H, address information having the above-mentioned track number “◯ T” and sector number “◯ S” is recorded in advance by embossing. In the magneto-optical disc 1 shown in the example of FIG. 5, address information from “10T0S” (0 sector of the 10th track) to “11T5S” (5 sectors of the 11th track) is recorded in the header H. On the other hand, in the data D, actual data information is recorded. Therefore, the information signal recorded on the magneto-optical disk 1 is configured to have address information and data information.

The magneto-optical disk 1 having the above structure
Is rotated by a spindle motor (not shown) about the rotation axis in the direction of arrow A, for example, at a constant angular velocity (CAV), while the optical pickup 2 arranged facing the magneto-optical disk 1 moves in the direction of arrow R ( By moving in the radial direction, the contents of the header H and the data D, which are the information signals in the sector S, are read out.

When the stationary state is maintained in the magneto-optical disk 1 having the recording format as described above, the sector number "○ S" in the header H is read by the optical pickup 2 and the sector number "○ S" is read. For example, a timing pulse is generated at the time when the sector number "5S" is changed to the sector number "0S", and the timing pulse causes the optical pickup 2 to move toward the inner circumference side by one track (one track. You can make it jump.

Alternatively, a timing pulse is generated when the sector number "○ S" has read a predetermined number, for example, the sector number "5S", and the timing pulse causes the optical pickup 2 to move toward the inner circumference by one track. Just move it.

[0011]

By the way, in the magneto-optical disk 1 formatted as shown in FIG. 5, one track corresponds to one physical circumference, and 1: 1. The number of sectors in one track is the same. In other words, the sector structure is synchronized with one physical track.

On the other hand, recently, with respect to a physical track for one round (hereinafter referred to as a physical track if necessary), for example, (1 / 1.5) to (1/2) rounds Was made to form one track, in other words, one
There has been proposed an optical disc having a track (hereinafter referred to as a logical track as necessary) formed so that the length of the track is less than one round of the physical length in the circumferential direction. .. This is because the recording density of the optical disc can be increased by forming the physical length of the logical track in the circumferential direction, for example, to be substantially constant. Even when the tracks having the asynchronous sector structures are formed, the same number of sectors is selected in one logical track for the convenience of data processing.

However, in an optical disc having logical tracks formed in this way, the same sector number may exist in one physical round. Therefore, when the optical disc is rotated by one physical track (one rotation) while reading the sector number, the optical pickup is moved radially inward by one physical track to maintain the stationary state. In the optical disk device based on the technology, there is a problem that the optical pickup sequentially moves to the inner circumference side, and the stationary state cannot be maintained.

The present invention has been made in view of the above problems. Even when an optical disc has a track whose length is different from the physical length of one circumference in the circumferential direction, the optical disk can be kept stationary. An object is to provide an optical disk device that can be maintained.

[0015]

An optical disk device according to the first aspect of the present invention, as shown in FIG. 1, for example, has an address portion in which address information having a track number and a sector number is recorded and data information. An optical disk 11 in which sectors each having a data section are physically arranged in a spiral shape.
A spindle motor 12 for rotating the optical disc 11, an optical pickup 21 arranged to face the disc surface of the optical disc 11 to read the recorded address information, and address information read by the optical pickup 21. Comparing means 43 for comparing ADRn with preset address information ADRt is provided, and the preset address information ADRt in the comparing means 43 is a combination of a specific track number and sector number of the optical disk 11. When the comparison results of the comparison means 43 match, the optical pickup 21 is returned to the inner circumferential direction of the optical disk 11 by one track.

The optical disc apparatus of the second aspect of the present invention is the optical disc apparatus of the first aspect of the present invention, in which the address information ADRt preset in the comparing means 43 is the final address of the write address information or the read address information for the optical disc 11. The address information is such that at least one sector of address information is added to the information.

The optical disc apparatus of the third aspect of the present invention is the optical disc apparatus of the first aspect of the present invention, in which the address information ADRt preset in the comparing means 43 is a predetermined one of the write address information and the read address information for the optical disc 11. It is made to be address information.

[0018]

According to the optical disk device of the first aspect of the present invention, the address information ADRn read by the optical pickup 21 is read.
And the address information ADRt set in advance
When the comparison is made according to 3, the track number is compared with the sector number, and when they match, the optical pickup 21 is moved back by one track in the inner circumferential direction of the optical disk 11. The recording format is such that the length of one track is physically 1 in the circumferential direction.
Even if the track has a track having a different length from the circumference, the stationary state can be reliably maintained.

According to the optical disc device of the second aspect of the present invention, the address information ADRt preset in the comparing means 43 is
Of the write address information or the read address information for the optical disc 11, the address information is such that the address information for at least one sector is added to the final address information. Writing or optical disk 11
Can be surely read out, and the stationary state is surely maintained based on the sector having the track number / sector number indicated by the address information in which the address information for at least one sector is added to the final address information. be able to.

According to the optical disc apparatus of the third aspect of the present invention, the address information ADRt preset in the comparing means 43 is
Of the write address information or the read address information for the optical disk 11, the predetermined address information is set, so that the sector having the track number / sector number indicated by the predetermined arbitrary address information is surely stopped. The state can be maintained.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the optical disk device of the present invention will be described below with reference to the drawings. In the drawings referred to below, those corresponding to those shown in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 shows a schematic structure of an optical disk device according to this embodiment. In FIG. 1, 11 is an optical disk. FIG. 2 shows the recording format of the optical disc 11. In this optical disk 11, the recording grooves are arranged in a spiral shape from the inner peripheral side to the outer peripheral side in the radial direction R. It should be noted that the optical disc 11 is not limited to a rewritable optical disc such as a magneto-optical disc.
It may be an optical disk that can be written only once or a read-only optical disk.
In the following description, the optical disc 11 is assumed to be a magneto-optical disc.

The optical disk 11 shown in FIG. 1 and FIG.
The logical track is formed so that the length of one track is less than one round of the physical length in the circumferential direction. Therefore, high density recording becomes possible as compared with the magneto-optical disk 1 shown in FIG.

In the example of FIG. 2, each logical track is set to 1
As a unit, the track number "○ T" is 0T in order from the inner circumference,
, 10T, 11T, 12T, ... Further, each logical track is divided into eight sectors S each having the same length in the circumferential direction, and sector numbers “◯ S” (clockwise 0S to 7S) are sequentially assigned. Since the lengths of the respective sectors S in the circumferential direction are equal, the lengths of the logical tracks in the circumferential direction are also equal in the end.

Here, each arbitrary sector S is composed of a header H and data D, respectively. Of these, the header H has a track number "○ T" and a sector number "○ S".
And are recorded in advance. Optical disk 11 shown in FIG.
Then, in the header H, the address information (hereinafter referred to as address data) ADR from "10T0S" (0 sector of the 10th track) to "12T0S" (0 sector of the 12th track) is recorded. Has been done.

The optical disk 11 having such a structure is
Based on a speed command signal from the system controller 13, the spindle motor 12 rotates about the rotation axis in the direction of arrow A at a constant angular velocity (CAV), for example. The system controller 13 is a CP
The U, ROM, RAM, and other input / output interfaces are provided, as well as a tracking servo control circuit, a focus servo control circuit, and the like.

An optical pickup 21 for irradiating the optical disk 11 with a light beam 10 for writing or reading recording pits (marks) is arranged so as to face the disk surface of the optical disk 11 thus rotated.

The optical pickup 21 has an objective lens 22 fixed to a bobbin (not shown).
The tracking coil 23 fixed to the bobbin
Is moved at high speed in the tracking direction (the same direction as the radial direction R) Tr, while being moved at high speed in the focusing direction (direction orthogonal to the disc surface) Fr by the focusing coil 27 fixed to the bobbin. Is becoming That is, the optical pickup 21 operates as a so-called in-field pickup as a biaxial device.

The optical pickup 21 configured as described above
Is fixed on the optical base 24,
Is transported in the radial direction R on the guide rail 25 by the feed motor 26. In practice, the feed motor 26 and the guide rail 25 are configured as a linear motor.

In this case, the recording range or the reading range of the optical pickup 21 is controlled according to the value of the stroke data S ₂ of the command data S ₁ supplied through the terminal 28. Here, the command data S ₁ having the stroke data S ₂ is transmitted from a host computer (not shown) to a peripheral device interface (SCSI; Small Comput
data supplied to the terminal 28 through the er system interface).

The stroke data S ₂ is usually recorded or read start address data ADRa (track number "○ T" and sector number "○ S") and its start address data ADRa to end address data ADRb (track number "○ S". T ”and the number of sectors S up to the sector number“ ◯ S ”). As the command data S ₁ , only the stroke data S ₂ may be supplied, or the target address setting data S ₃ may be supplied simultaneously with the stroke data S ₂ . The target address data S3 will be described later.

A fixed optical system 30 is optically connected to the optical pickup 21 through an optical path 31. This fixed optical system 30 is basically a beam splitter 3
2, a laser diode 33 as a light emitting means, and a photodiode 34 as a light receiving means.

The laser diode 33 outputs a light beam having a light quantity (each quantity of erasing / recording / reading) according to a light quantity signal supplied from a light quantity control circuit 35 in response to a command from the system controller 13 to the beam splitter 32. And to the optical pickup 21 through the optical path 31.

In this case, at the time of recording, the optical beam 11 focused by the objective lens 22 and applied to the optical disk 11 and the magnetic circuit (not shown) cooperate with each other.
Recording pits (magnetization pits) are formed at the.

On the other hand, the reading light beam 10 applied to the optical disc 11 is reflected by the optical disc 11 having the recording pits formed therein, and passes through the objective lens 22 from the optical pickup 21 to the optical path 31 and the beam splitter 32.
It is incident on the photodiode 34 through.

The output signal of the photodiode 34 is supplied to the reproducing circuit 41. The reproduction circuit 41 reproduces the supplied output signal and outputs the reproduction signal S ₀ to the system controller 13
And the address detection circuit 42. The system controller 13 controls each of the tracking servo and the focus servo based on the reproduction signal S _{0 and the} like.

On the other hand, the address detection circuit 42 detects the address data of the header H of the sector S currently being recorded or read out (hereinafter referred to as the current address data ADRn) from the reproduction signal S _0. It is held and supplied to the system controller 13 and the comparison input terminal C of the comparison circuit 43. This current address data AD
Rn is composed of a track number “◯ T” and a sector number “◯ S”.

The reference input terminal REF of the comparison circuit 43 has
Target address data AD from the target address setting circuit 44
Rt is supplied. This target address data ADR
t is also composed of a track number “◯ T” and a sector number “◯ S”. Here, the target address data ADR
Different values of t are set depending on the first and second operation modes based on the operation program stored in the ROM of the system controller 13.

In the first operation mode, of the command data S ₁ supplied from the host computer (not shown) through the terminal 28, the final address data ADRb determined by the stroke data S _{2 corresponds} to at least one sector, preferably. Is the target address data ADR, which is the data to which the address data for 2 to 3 sectors is added.
It is set in the target address setting circuit 44 as t.

In the second operation mode, the command data S
_If the target address setting data S ₃ is included in ₁ , the address data represented by the target address setting data S ₃ (composed of track number “T” and sector number “S”) Is directly set in the target address setting circuit 44 as the target address data ADRt.

The comparison circuit 43 uses the target address data AD.
When Rt and the current address data ADRn match, a timing pulse P ₁ is generated and supplied to the jump signal generating circuit 45.

The output jump signal of the jump signal generating circuit 45 is supplied to the tracking coil 23 through the drive circuit 46.
Is supplied to. When the output signal of the drive circuit 46 is supplied to the tracking coil 23 constituting the optical pickup 21, the objective lens 22 is returned in the radial direction R by one physical track in the inner circumferential direction Ri in synchronization with this. It will be.

Details of the operation for returning one physical track in the inner circumferential direction Ri in this way are described in, for example, Japanese Patent Application Laid-Open No. 3-25729 or Japanese Patent Application Laid-Open No. 3-25730 filed by the present applicant. This is easily possible by utilizing the known technique disclosed in.

As described above, according to the above-described embodiment, the comparison circuit 4 compares the current address data ADRn which is the address information read by the optical pickup 21 and the target address data ADRt which is the preset address information.
3, the track number “◯ T” in addition to the sector number “◯ S” is compared, and when they match, the optical pickup 21 causes the optical pickup 21 to move in the inner circumferential direction Ri.
I try to get back one track. For this reason,
Even if the recording format of the optical disk 11 is such that the length of one track is different from the physical length of one circumference in the circumferential direction as shown in FIG. The state can be maintained.

Next, among the operations of the above-described embodiment, the operations of the above-described first operation mode and second operation mode will be described more specifically based on the operation flows shown in FIGS. In order to avoid complexity, it is assumed that the optical disc device is operating in the read state.

The system controller 13 first reads the command data S ₁ supplied from the host computer (not shown) through the terminal 28 (step S1).
1).

Next, the system controller 13 determines whether or not the command data S ₁ includes the target address setting data S ₃ (step S12). When the target address setting data S ₃ is not included but only the stroke data S ₂ is included, the operation is performed in the first operation mode (step S13).

The stroke data S ₂ is "1T0S;
S = 81 ". Here, “1T0S” is the read start address data ADRa, and “S = 8”
“1” represents the number of read sectors. From this stroke data S ₂ , the system controller 13 determines that the read start address data ADRa is ADRa = 1T0S.
And the read end address ADRb is ADRb = 1.
It can be seen that it is 1T0S. The read end address ADRb = 11T0S is the 81st sector S from the read start address data ADRa = 1T0S.

In this case, the target address data ADRt
Is ADRt = ADRb + 2S = 11T0S + 2S = 1
It is calculated as 1T2S, and the value is set in the target address setting circuit 44 (step S13). The set target address data ADRt = 11T2S is compared with the comparison circuit 4
3 reference input terminals REF.

Then, the system controller 13 reads and reproduces one sector from the optical disk 11 based on the stroke data S ₂ (step S14). That is, first, the read start address data ADRa = 1
Reading is started from the sector S designated by T0S.

When one sector S of the optical disk 11 is reproduced. The reproduction signal S ₀ from the reproduction circuit 41 is sent as reproduction data S ₄ to the host computer (not shown) through the output terminal 29.

The reproduced signal S ₀ is supplied to the address detection circuit 42. The address detection circuit 42 detects the address information contained in the header H of the reproduction signal S ₀ and outputs the current address data ADRn composed of the track number “◯ T” and the sector number “◯ S” to the system controller 13. And a comparison input terminal C of the comparison circuit 43
(Step S15).

The comparison circuit 43 receives the current address data.
Compare ADRn and target address data ADRt
(Step S16). Currently address data ADRn is not
However, if the target address data ADRt is not reached, the scan
Steps S14 to S16 are repeated and
As described above, the information recorded on the optical disk 11 is the reproduction signal S.
₀Is read out as
Playback data S through roller 13_FourAs output terminal 29
Is sent to a host computer (not shown).

By operating in this way, the reproduction circuit 41 sends the current address data A to the system controller 13.
DRn = 11T0S, that is, stroke data S ₂
When the same address data as the read end address ADRb determined in step 3 is supplied, the system controller 13 stops the output of the reproduction data S ₄ to the output terminal 29 (data processing not shown in step S14). ..

After that, the reproducing operation by the reproducing circuit 41 and the address detecting operation by the address detecting circuit 42 are continued (step S15), and the present address data ADRn.
However, when the current address ADRn = 11T2S is supplied from the address detection circuit 42 to the comparison circuit 43,
The determination in step S16 is established (current address ADR
n = target address ADRt = 11T2S).

[0056] When the determination is satisfied, the timing pulse P ₁ is outputted from the comparator circuit 43, the timing pulse P ₁ is supplied to the jump signal generation circuit 45. The output jump signal of the jump signal generation circuit 45 is the drive circuit 4
It is supplied to the tracking coil 23 through 6. When the output signal of the drive circuit 19 is supplied to the tracking coil 23 constituting the optical pickup 21, the objective lens 22 is synchronized with this and the objective lens 22 in the radial direction R is in the inner peripheral direction R.
One physical track is returned to i (step S17). Specifically, as can be seen from FIG. 2, the content of the header H starts from the sector S whose header is “11T2S”.
The light beam 10 of the optical pickup 21 is returned to the sector S whose content is “10T2S”. That is, the track jump operation for one physical track is performed.

Then, the reproducing process of the header H is further performed by the reproducing circuit 41 and the address detecting circuit 42 (step S18), and the present address data ADRn and the target address data ADRt are compared (step S18).
19). In this way, step S18 and step S
19, the content of the header H is “10T4S”, “10T5S”, ...
Is read out and compared, and when the content of the header H becomes the target address data ADRt = 11T2S again,
The jump signal generating circuit 45 operates and the content of the header H, which is a physical track inside the jump signal generating circuit 45, is "10T2S".
The light beam 10 of the optical pickup 21 is returned to the sector S.

As described above, according to the embodiment of the first operation mode described above, the target address data ADRt which is the address information set in the comparison circuit 43 is the optical disc 1
Of the read address information from 1 (or write address information to the optical disk 11), the address information is the final address data ADRb, which is the final address information, plus the address information for two sectors. Therefore, the read operation from the optical disk 11 (or
(Writing operation to the optical disk 11) can be surely performed, and the stationary state can be surely realized.

Next, the second operation mode will be described. This second operation mode is supplied to the terminal 28 and read by the system controller 13 (step S1).
1) This is an operation mode in which the command data S ₁ includes both stroke data S ₂ and target address setting data S ₃ . Therefore, the determination in step S12 is established.

In this case, the system controller 13
The track number “◯ T” and sector number “◯ S” of the sector S represented by the target address setting data S ₃ are directly used as the target address data ADRt as the target address setting circuit 44.
Is set (step S20). Here, the target address data ADRt = “pq” T “r” S.

FIG. 4 shows the processing from the connector to the connector in the flow chart shown in FIG.

Therefore, the reproduction circuit 41 reads out a portion of the portion specified by the stroke data S ₂ (between the sector S designated by the read start address ADRa and the sector S designated by the read end address ADRb), and The read data is output as reproduction data S ₄ from the output terminal 29 to the external host computer (step S21).

During the reading, the address detection circuit 42 detects the present address data ADR from the reproduced data S ₄ at any time.
n is detected, the system controller 13 and the comparison circuit 4
3 and 3 (step S22).

On the other hand, when the current address data ADRn, which is the same as the read end address data ADRb specified by the stroke data S ₂ , is supplied from the reproducing circuit 41 to the system controller 13, the system controller 1
In step 3, the optical base 24 is moved by the motor 26 at a higher speed to the inner circumference side by several tracks than the physical track in which the sector S in which the target address data ADRt = pqTrS is recorded is present (step S24).

From that point, the read operation is started again in the outer peripheral direction Re (step S18, see FIG. 3). Then, when the current address data ADRn becomes the target address data ADRt = pqTrS (step S1
9) Based on the output timing pulse P ₁ of the comparison circuit 43, the jump operation to the inner circumference of one track can be performed (steps S17 to S19).

As described above, according to the second operation mode described above, the target address data ADRt, which is the address information preset in the comparison circuit 43, is read out from the optical disk 11 (optical disk 1).
Of even be) by the write address information to 1, and is the target address data ADRt = pqTrS a predetermined address information determined by the target address setting data S _3. Therefore, with reference to the sector S having the track number “pqT” and the sector number “rS” indicated by the target address data ADRt = pqTrS which is the predetermined arbitrary address information, in other words, the sector S is used for one track jump. The static state can be reliably realized as an address.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

[0068]

As described above, according to the optical disk device of the first aspect of the present invention, when the address information read by the optical pickup and the preset address information are compared by the comparing means, the sector In addition to the track numbers, the track numbers are also compared, and when they match, the optical pickup is moved back one track in the inner circumferential direction of the optical disc. Therefore, even if the recording format of the optical disk is such that the length of one track is different from the physical length of one circumference in the circumferential direction, the still state can be reliably maintained. It has the effect that

Further, according to the second optical disk device of the present invention, the address information preset in the comparing means has at least one sector in the final address information of the write address information or the read address information for the optical disk. The address information is added to the address information. Therefore, writing to or reading from the optical disc specified by the final address information can be performed reliably, and the track number indicated by the address information obtained by adding at least one sector of address information to the final address information. -It has an effect that the stationary state can be reliably maintained based on the sector having the sector number.

According to the optical disk device of the third aspect of the present invention, the address information preset in the comparing means is the predetermined address information of the write address information or the read address information for the optical disk. There is. Therefore, there is an effect that the stationary state can be surely maintained based on the sector having the track number / sector number indicated by the predetermined arbitrary address information.

[Brief description of drawings]

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

FIG. 2 is a diagram provided for explaining an example of a recording format of an optical disc applied to the optical disc device shown in the example of FIG.

FIG. 3 is a flowchart provided for explaining the operation of the optical disc device shown in the example of FIG.

FIG. 4 is a flowchart provided for explaining the operation of the optical disc device shown in the example of FIG.

FIG. 5 is a diagram provided for explaining a recording format of a general magneto-optical disk.

[Explanation of symbols]

 11 optical disk 21 optical pickup 43 comparison circuit 44 target address setting circuit 45 jump signal generation circuit ADRt target address data ADRn current address data

Claims (3)

[Claims] 1. An optical disc in which sectors are physically arranged in a spiral shape and each of which has an address section in which address information having a track number and a sector number is recorded, and a data section in which data information is recorded, and A spindle motor for rotating the optical disc, an optical pickup arranged to face the disc surface of the optical disc to read the recorded address information, and the address information read by the optical pickup and a preset address. The address information preset in the comparison means is a set of a specific track number and sector number of the optical disc, and the comparison result of the comparison means is When they match, the optical pickup is moved back one track in the inner circumferential direction of the optical disc. Optical disc apparatus characterized by a. 2. The address information preset in the comparing means is address information obtained by adding address information for at least one sector to final address information of write address information or read address information for the optical disk. The optical disk device according to claim 1, wherein: 3. The optical disk device according to claim 1, wherein the address information preset in the comparison means is predetermined address information among write address information and read address information for the optical disk.