JP2000315378A - Method and device for position discrimination in disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the average access time by making an optical head wait tracing when the difference between the present sector address and a target sector address is within the number of adjacent discrimination sectors corresponding to the number of sectors of one round in a target sector address. SOLUTION: When the access operation of an optical head 2 is started, a target sector address is sent to a subtracter 11 from a target sector address RAM 13. The subtracter 11 obtains the difference between the present sector from a sector address detector 8 being pointed presently by an optical head 2 and a target sector, and sends the difference to a comparator 15. An adjacent sector number generator 14 reads out an optimum adjacent discrimination sector number previously calculated corresponding to a target sector address for each kind of the optical disk 1, and sends the number to the comparator 15. Seek operation is performed when the present sector is outside the target sector or is deviated from the adjacent discrimination sector number. A trace operation is continued when the present sector is within a range of the adjacent discrimination sector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CLV (Cons)
Tent Linear Velocity (constant linear velocity) type disk device (for example, CD (Compac)
t Disk), CD-ROM, DVD (Digita
l Video Disk), a playback mechanism of an optical disk device such as a DVD-ROM, and in particular, whether or not to perform a seek operation in a preceding stage when an information reproducing optical head is moved to a target position (sector) of a disk-shaped recording medium. And a method for determining an optimum value of the number of sectors for determining whether or not to wait for trace reproduction at the last stage.

[0002]

2. Description of the Related Art Conventionally, a disk recording / reproducing apparatus (hereinafter, generally referred to as "disk apparatus") using a disk-shaped recording medium (hereinafter, generally referred to as "disk" or "disk medium") on which CLV recording such as an optical disk is performed. ), To move an information recording / reproducing optical head (hereinafter collectively referred to as an “optical head”) to a target reproduction position (hereinafter collectively referred to as an “access operation”), move to a target track (hereinafter referred to as a “seek”). ) And waiting for a trace to the target position (hereinafter collectively referred to as “trace”). The access operation calculates the number of tracks traversed by the optical head,
When the calculated value coincides with the number of tracks crossed during the seek operation (hereinafter collectively referred to as the “cross track number”), it is determined that the optical head has reached near the target position. The operation traces to the sector position and shifts to the reproducing operation.

[0003] The access operation also includes a case where the optical head shifts from a state where the optical head is already waiting near the target position to a reproduction state. In the above disk device,
It is necessary to judge that the optical head is close to the target sector in some form. However, since the condition content is not the number of sectors but the track unit, the number of sectors obtained by adding one round (one track) and several sectors is required. Even if it is optimal, it cannot be corrected, and even if the condition content is the number of sectors, it is a constant based on the outer circumference, so extra trace waiting on the inner circumference is not the optimal condition. .

[0004]

In order to speed up and stabilize the access operation time of the disk drive, it is necessary to speed up the operation of moving the optical head and shorten the waiting time near the target sector. Various methods have been devised to increase the speed of the optical head moving operation by increasing the speed of moving the optical head and increasing the accuracy of the number of track movements. However, the present invention focuses on shortening the waiting time. Was regarded as an issue.

In the access operation of the disk drive, the movement convergence position of the optical head due to the seek is such that when the target sector 32 is located at a position as shown in FIG. Less than one lap before the track. However, the movement convergence position of the optical head is
It fluctuates depending on the sector position at which the seek starts, the moving speed of the optical head in the radial direction, the rotational speed of the spindle, and the optical head stabilization time after the seek. On the other hand, in a theoretical ideal environment, high-precision calculation of the number of moving tracks
The optical head can be converged within one round of the track.

Theoretically, even with this method, the optical head does not largely deviate from the vicinity of the target position, but it is asserted that erroneous counting of the number of cross tracks due to disturbances such as noise and vibration during seeking does not occur in a real environment. Can not. Further, focusing on one physical point on the disk when the disk having tracks recorded in a spiral shape is rotated, as shown in FIG. 10, when the optical head is fixed, as shown in FIG. The trajectory circle 35 and the spiral track 30 intersect at an intersection 36 after one rotation,
In this way, a phenomenon occurs that is equivalent to one track cross. Looking at an example of an 8-track seek in an actual seek operation, if the disk medium is represented as a plane continuous in the circumferential direction as shown in FIGS. In the case of seek, the trajectory of the optical head is shown in FIG.
In the case of a seek from the inner circumference to the outer circumference, the trajectory of the optical head is as shown in FIG.
And the actual number of cross tracks does not match the number of tracks in the concentric circle approximation calculation. FIG.
As can be seen from the examples of FIGS. 11A and 11B, FIG.
This error monotonically increases as the seek distance increases as long as the inclination of the broken lines 42 and 43 in FIG. 11A and FIG. 11B does not change.

Since such erroneous counting of the number of cross tracks and mismatch of the number of tracks depend on the accuracy of the apparatus,
It cannot be assumed and stipulated. These two points require a means for determining that the target sector is near the target sector after the seek. In the case of a CLV recording disk on which information is recorded so as to have a constant linear velocity, the number of sectors in one round from the inner circumference to the outer circumference has a recording format of gradually increasing as shown in FIG. The number of sectors in one round that can be determined to be near the target sector indicates a value that increases according to the radial distance from the center. From this point, the determination criterion near the target sector cannot be an optimum value with a constant. That is, means for determining that the target sector is near the target sector corresponding to the target sector position is required.

Further, as the rotational speed of the disk increases, the locus of movement of the optical head in one seek (hereinafter collectively referred to as "jump") is indicated by a broken arrow 34 as shown in FIG. In such a case, even if a seek operation is performed after the optical head moves and converges to a sector position slightly larger than one round, even if the optical head is traced and waited, the optimum waiting time until the target sector hardly changes. Become. In this case, if an operation is performed to jump to the outer periphery and then jump back to the original track, an extra operation is eventually performed.

Further, when the optical head is moving on the trajectories to the outside and inside of the dashed arrow 34 which is the movement trajectory of the optical head as shown in FIG. 7, the optical head moves outward and inward. Is moving and trying to get off the truck. At this time, if an extra force acts on the optical head outward and inward due to disturbance, the movement to the target track is hindered, and the jump operation is performed again.
If a periodic disturbance enters and coincides with the jump period, the movement of the optical head oscillates around the target track. However, if the optical head is moved and traced on the track, the optical head has a force acting to keep it away from the track due to the action of the tracking servo. And As you can see from the above,
Moving the optical head more than necessary not only causes an extra operation, but also makes the optical head susceptible to disturbances and hinders stabilization.

[0010] From this point, it is necessary to provide a means for correcting the criterion in the vicinity of the target sector from the relationship between the disk rotation speed and the jump time. The sector length of the disk medium is determined by the standard, but is standardized with a certain width as shown in the table shown in FIG. Assuming that the sector length is l, the target sector address is S, the track pitch is p, the circumferential radius of the point where the sector address is 0 is r0, and r is the circumferential radius of the target sector address, N of the number of sectors in one round is:

[0011]

(Equation 1) And the number of sectors in one round also changes due to the change in the sector length. Furthermore, in existing commercial disk media,
Some discs are slightly out of standard, so the fluctuations are
May be even larger. From this point, it is necessary to provide a means for correcting the target sector vicinity determination criterion based on the sector length variation obtained from the linear velocity measurement function.

The access operation also serves as a transition from the state where the optical head is already waiting near the target position to the reproduction. With respect to this content, a mechanism for determining whether to seek or trace is required. Without such a mechanism, there is a problem that the determination of the vicinity of the reproduction target sector position is not sufficiently performed, and it is not possible to wait for the trace with the minimum necessary and optimal number of sectors.

The present invention solves the above-mentioned problem, and it is possible to reliably determine whether or not the optical head is near the target sector position, and wait for a trace with the minimum necessary number of optimum sectors. It is an object of the present invention to provide a position judging method and a position judging device for a disk device capable of performing the above.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention has a spiral information track having a CL.
A position determining method of a disk device for determining whether an optical head reading this information has reached a trace waiting position near a target position with respect to an optical disk to be recorded / reproduced. Reading the sector address of the target sector address, deriving the number of sectors in one round at the target sector address, and calculating the difference between the current sector address and the target sector address. Determining whether the number is within the number of neighboring determination sectors corresponding to the number of sectors in one round;
And controlling the optical head to wait for tracing when the number of the sectors is within the vicinity determination sector number.

According to this position determining method, it is possible to reliably determine whether the optical head is in the vicinity of the target sector position, and it is possible to wait for a trace with the minimum necessary and optimum number of sectors. .

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION
A position determining method of a disk device for determining whether an optical head for reading this information has reached a trace waiting position near a target position for an optical disk having a spiral information track and performing CLV recording and reproduction, A step of reading the current sector address pointed to by the current optical head, a step of deriving the number of sectors in one round at the target sector address, and obtaining a difference between the current sector address and the target sector address. Determining whether the number is within the number of neighboring determination sectors corresponding to the number of sectors in one round at a target sector address, and causing the optical head to wait for tracing if the number is within the number of neighboring determination sectors. And a control step.

According to this method, the number of sectors at the time of tracing can be set within the optimum neighboring sector value, and the access time can be reduced on average. Further, the position determination device in the disk device according to the second to sixth aspects of the present invention includes a sector address detector for knowing a sector (hereinafter, collectively referred to as a “current sector”) pointed to by the current optical head, And a subtractor for calculating the difference between the target sector and a target sector, and a neighboring sector number generator (sector number calculating means or Sector number storage means), a linear velocity detector for obtaining a sector length, a linear velocity detector and a spindle speed storage for knowing one sector trace time, and which of the above two data is used for one sector trace time And the number of sectors to be added and adjusted based on the one-sector trace time and the jump time (hereinafter collectively referred to as "number of additional sectors"). In addition to having an arithmetic unit for calculating the number of additional sectors, the optimum number of sectors during one round before any sector (hereinafter referred to as the “optimal number of neighboring sectors”) is calculated from the previously obtained sector length and the number of additional sectors. And a means for performing a correction operation for determining the following operation, and a means for determining whether the subsequent operation is seeking or waiting for tracing by comparing and judging the difference between the current sector and the target sector previously obtained and the optimum number of neighboring sectors. It has an algorithm.

With such a configuration, the number of physical one-sector sectors at an arbitrary target sector position can be calculated or generated by ROM data as the optimum number of neighboring sectors. By comparing the difference between the current sector and the target sector with the optimum number of neighboring sectors, it is possible to determine whether to seek or wait for trace. From this determination result, the number of sectors during the trace waiting can be set within the optimal neighboring sector value, and the access time can be shortened on average.

Further, according to the present invention, an optimum number of neighboring sectors can be generated by correcting the number of neighboring sectors at a target sector position based on a sector length that varies for each disk. This makes it possible to determine whether to seek or wait for a trace with higher accuracy. As a result, the number of sectors at the time of tracing can be set within a more accurate neighboring sector value, and the average access time can be further reduced.

Further, an optimum number of neighboring sectors can be generated by performing an additional correction operation on the number of neighboring sectors at the target sector position based on the number of additional sectors. As a result, it is possible to generate an optimal number of neighboring sectors which is larger by the number of additional sectors than the sector of one round of the physical track. As a result, useless movement of the optical head moving back and forth between tracks by the jump operation can be suppressed, and stability against disturbance can be increased.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram showing a main configuration for realizing the first embodiment of the present invention in an optical disc recording / reproducing apparatus as a disc apparatus for recording / reproducing on / from an optical disc. In FIG. 1, 1 is an optical disk, 2 is an optical head, 3 is an optical head driving device, 4 is a spindle motor, 5 is a spindle motor controller,
6 is a track crossing signal detector, 7 is a track crossing signal counter, 8 is a sector address detector, 9 is a linear velocity detector, and 10 is a controller.

The controller 10 has the following components to implement the algorithm of the present invention. 11
Is a subtractor, 12 is a seek operation judging mechanism, 13 is a target sector address RAM, 14 is a neighbor sector number generator, and 15 is a comparator. In the optical disk recording / reproducing apparatus configured as described above, an access operation incorporating the present invention and points of the present invention will be described with reference to the flowchart of FIG.

In the flowchart of FIG. 2, when the access operation of the optical head 2 is started, the optimum number of neighboring sectors ΔSm at the target sector position is calculated by (Equation 2) in step S1, which is the first point of the present invention. And generate it.

[0024]

(Equation 2) Here, in (Equation 2), ΔSm is the number of sectors in the vicinity range (natural numbers rounded up to the decimal point), S is the target sector address (natural number), p is the track pitch length (length between tracks) (mm), and l is the sector. Length (mm), r0 is sector 0
A position radius (mm), and r is defined as a circumferential radius (mm) of a target sector address.

The optimum number of neighboring sectors ΔSm at the target sector position uses the target sector address S indicating the target sector position as a variable, and the other values are constants if the disk medium is determined. With the sector address of the above, the number of sectors in one round, that is, the optimum number of neighboring sectors ΔSm at the target sector position can be generated by circular approximation. Next, in step S2, the current sector address is read, and the second sector of the present invention is read.
The difference ΔS between the target sector address and the current sector address shown in the following equation (Equation 1) in step S3 which is the point of
Ask for.

ΔS = target sector address−current sector address (Equation 1) It is determined whether or not the target sector is near the target sector by a simple calculation method of finding the difference ΔS between the target sector address and the current sector address in (Equation 1). Can be used as data. Next, steps S4 and S5, which are the third point of the present invention.
Then, the seek or trace is determined by simple determination based on the optimum number of neighboring sectors ΔSm at the target sector position obtained in the previous steps S1 and S3 and the difference ΔS between the target sector address and the current sector address. If the current sector does not fall outside or within the vicinity of the target sector, step S
In steps S6 to S9, the number of seeks is determined and seek is performed.
After the seek, the processing from step S2 is repeated. During this repetition, when it is determined in step S5 that the current sector is in the vicinity range, the process proceeds to the Yes side, and thereafter, a tracing operation is performed in steps S10 and S11, and the target is set as in the condition of step S10. When the trace is performed up to one sector before the sector, the access operation ends.

The optimum number of neighboring sectors ΔSm at the target sector position is calculated or measured in advance in accordance with the target sector address and stored in the ROM. Number of neighboring sectors ΔSm
May be read. As described above, the process S1
, The optimal number of neighboring sectors ΔSm at the target sector position
Is generated, a comparison in a simple subtraction equation from step S3 to step S5 makes it possible to determine the optimum in-neighbor range at an arbitrary sector position. As a result, the trace waiting time can be stably shortened on average. .

FIG. 3 is a schematic block diagram showing a main configuration for realizing the second embodiment of the present invention in an optical disk recording / reproducing apparatus. In FIG.
The configuration from to is the same as that of the first embodiment. As an additional configuration, a sector length detection mechanism 16 and a correction calculator 17 are provided.

In the optical disk recording / reproducing apparatus configured as described above, the access operation in the flowchart is the same as the operation of the first embodiment. However, by adding the sector length detection mechanism 16 and the correction arithmetic unit 17 in FIG. 3, as shown in FIG. 4, the allowable range of the sector length permitted by the standard and the optical disk having a sector length outside the standard can be used. In this case, the correction operation can be performed. Number of neighboring sectors ΔSm in step S1 of the flowchart shown in FIG.
Is the same as (Equation 2), but since the sector length l can be set for each optical disc being reproduced by the sector length detection mechanism 16 shown in FIG. 3, the allowable range of the standard or the sector length outside the standard can be set. The influence can be absorbed, and the more accurate number of neighboring sectors ΔSm can be generated.

The number of neighboring sectors at the target sector position Δ
Sm 'may be calculated or measured in advance in accordance with the target sector address and stored in the ROM, and the stored number of neighboring sectors ΔSm' at the target sector position may be read as needed. However, in this case, similarly to the first embodiment, the sector length 1 in (Equation 2) becomes the number of neighboring sectors ΔSm ′ as a constant.

Therefore, ΔSm is the same as (Equation 2), the number of sectors in the neighborhood (a natural number rounded up below the decimal point), ΔSm ′
Is ROM data calculated or measured in advance according to the target sector address, and A and B are defined as approximation constants. The optimum neighborhood range ΔSm at an arbitrary sector position according to the change in the sector length 1 obtained by the sector length detection mechanism 16 in FIG.
Can be requested.

ΔSm = A × (27−1) ² × ΔSm ′ + B (Equation 2) However, since it is only an approximation, the corresponding range of the sector length 1 needs to be set. FIG. 5 shows an example of ROM data on a CD as a reference example. As described above, it is possible to make a more optimal determination in the vicinity range at an arbitrary sector position including an optical disc that does not conform to the standard. As a result, the trace waiting time can be stably shortened on average.

However, in the above-described first and second embodiments, since the effect of stably shortening the trace waiting time by obtaining the number of sectors in one round is obtained, the disturbance is suppressed. Therefore, it is not possible to suppress the useless movement of the optical head in a high-speed disk device to suppress the influence of physical disturbance. This point will be discussed in the third embodiment below.

FIG. 6 is a schematic block diagram showing a main configuration for realizing the third embodiment of the present invention in an optical disk recording / reproducing apparatus. In FIG. 6, the optical disk 1
The configuration from to is the same as that of the first embodiment. As an additional configuration, a correction arithmetic unit 17, a spindle speed (RAM) 18, and an additional sector number arithmetic unit 19
And a multiplexer (abbreviated as MPX) 20.

In the optical disk recording / reproducing apparatus configured as described above, the access operation in the flowchart is the same as the operation of the first embodiment. However, the correction operation unit 17 and the spindle speed (RA
M) Correction calculation for suppressing useless movement of the optical head such as the trajectory 34 of the optical head in FIG. 7 when the speed is increased by adding the 18, the additional sector number calculator 19 and the MPX 20. Can be done. In the calculation of ΔSm in step S1 of the flowchart shown in FIG.
Is the number of neighboring range sectors (natural numbers rounded up to the nearest decimal point),
N is the number of sectors around one cycle (natural number rounded up to the decimal point), S
Is the target sector address (natural number), p is the track pitch length (inter-track length) (mm), and l is the sector length (m
m), r0 is the radius of the sector 0 position (mm), r is the radius of the circumference of the target sector address (mm), α is the number of sectors corrected by the relationship between the spindle speed and the single jump time (natural number rounded down to the decimal point), tj If is defined as one jump time (ms), cl is defined as linear velocity (mm / ms), and cv is defined as angular velocity (r / ms), it can be calculated and generated by (Equation 3).

[0036]

(Equation 3) The number α of corrected sectors based on the relationship between the spindle speed and the single jump time in (Equation 3) is CLV (constant linear velocity) and C
There are two types, AV (constant angular velocity), in an optical disk recording / reproducing apparatus, which is CLV at low speed but becomes CAV at high speed, so two types are prepared for both. The linear velocity cl and the angular velocity cv in (Equation 3) are
The linear velocity detector 9 and the spindle speed (RA
M) 18. In the case of CLV, the spindle controller 5 automatically determines that the linear velocity is a constant multiple of the speed of the instruction from the controller 10, and since the actual linear velocity is not clear in the controller 10, the linear velocity is detected. Determined by the vessel 9. However, CA
In the case of V, since the controller 10 indicates what RPM, the spindle speed is determined from the spindle speed (RAM) 18 in the controller 10. Also,
The control by the controller 10 determines which of the CLV and the CAV is controlled. Therefore, which data of the linear velocity detector 9 or the spindle speed (RAM) 18 is transmitted to the additional sector number calculator 19. MP to give
X20, a correction sector number α is generated based on the relationship between the spindle speed and the single jump time.

The number N of one-round sectors in (Equation 3) has the same formula as the optimum number of neighboring sectors ΔSm at the target sector position in (Equation 2) in the first embodiment. The target sector address S indicating the target sector position is used as a variable in the same manner as in the first embodiment. Also, the newly defined single jump time tj is a constant because it is determined by the mechanism and the jump servo. Accordingly, in (Equation 3), the variables are the target sector address S indicating the target sector position and the linear velocity cl or the angular velocity cv.

In the same manner as in the first embodiment, the number N of one-round sectors is obtained in advance by calculation or actual measurement according to the target sector address and stored in the ROM. May be read out. Corrected sector number α generated as described above
By tracing the track on the track without moving the optical head with the number of neighboring sectors including, the useless movement of the broken line arrow 34 which is the movement locus of the optical head as shown in FIG. 7 is eliminated. Since the optical head has a force acting to keep it away from the track due to the action of the tracking servo, the optical head attempts to trace on the track even when disturbance acts. As a result, while ensuring the trace waiting time, the time that is strong against disturbance increases.

As described above, it is possible to make a more optimal determination in the vicinity range by using an arbitrary sector position, a spindle rotation method, and a speed. As a result, the trace waiting time can be stably shortened on average, and the wastefulness can be further reduced. The effect of physical disturbance can be suppressed by suppressing the movement of the optical head. FIG. 8 is a schematic block diagram showing a main configuration for realizing the fourth embodiment of the present invention with an optical disk recording / reproducing apparatus.

In FIG. 8, the components from the optical disc 1 to the correction calculator 17 are the same as those of the second embodiment. The same spindle speed (RAM) 18, additional sector number calculator 19, MPX
20. In the optical disk recording / reproducing apparatus configured as described above, the access operation in the flowchart is the same as the operation of the first embodiment.

However, since the configuration of the second embodiment and the configuration of the third embodiment are combined, the operation formula for generating the optimum number of neighboring sectors ΔSm at the target sector position is as follows. Same as (Formula 3) in the form, but the second
The correction is performed both at the point of correction with the sector length l, which is a feature of the third embodiment, and at the point of correction with the spindle rotation method and speed, which is a feature of the third embodiment.

From the above, it is possible to make a further optimum judgment in the vicinity range by an arbitrary sector position, spindle rotating method and speed, and to stably shorten the average trace waiting time, and further reduce unnecessary movement of the optical head. It is possible to suppress the influence of physical disturbance. In the above embodiment, the number of neighboring sectors for neighborhood determination is set to the number of physical one-turn sectors at the target sector position or the number of sectors substantially equal to this. It is also possible to set a value proportional to the number of sectors as the number of neighboring determination sectors.

[0043]

As described above, according to the present invention, the trace waiting time during the access operation can be shortened on average by performing the optimum in-range determination at an arbitrary sector position. Further, useless movement of the optical head can be suppressed, and the influence of disturbance can be suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration for realizing a first embodiment of the present invention in an optical disk recording / reproducing apparatus.

FIG. 2 is a flowchart illustrating a position determination method according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a main configuration for realizing a second embodiment of the present invention in an optical disk recording / reproducing apparatus.

FIG. 4 is a diagram showing an allowable sector length range permitted by standards for CDs and DVDs;

FIG. 5 is a diagram of a numerical example when ROM data is actually converted into a CD.

FIG. 6 is a block diagram showing a main configuration for realizing a third embodiment of the present invention with an optical disc recording / reproducing apparatus.

FIG. 7 is a diagram showing a useless movement of the optical head after moving and converging a little before the one-turn sector when the speed is increased;

FIG. 8 is a block diagram showing a main configuration for realizing a fourth embodiment of the present invention in an optical disk recording / reproducing apparatus.

FIG. 9 is a diagram showing an optimum vicinity range with respect to a target sector position on an optical disc;

FIG. 10 is a diagram showing that a circle traced on a disk with an optical head fixed and a spiral track make one turn are equivalent to one track cross.

11A and 11B are diagrams showing the relationship between the trajectory of the optical head and the number of track crosses when the disk medium is represented as a plane that is continuous in the circumferential direction. FIG. 11A shows the case where the optical head moves from the outer circumference to the inner circumference. FIG. 4B shows a case where the optical head moves from the inner circumference to the outer circumference.

FIG. 12 is a diagram showing a disk format of an optical disk, a disk rotation speed, a sector length, and the number of sectors in one round in a recording / reproducing method.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 optical head 3 optical head driving device 4 spindle motor 5 spindle motor controller 6 track traversing signal detector 7 track traversing signal counter 8 sector address detector 9 linear velocity detector 10 controller 11 subtractor 12 seek operation judging mechanism 13 target Sector address (RAM) 14 Neighbor sector number generator 15 Comparator 16 Sector length detection mechanism 17 Correction arithmetic unit 18 Spindle speed (RAM) 19 Additional sector number arithmetic unit 20 MPX 30 Track 31 Sector address 32 Target sector 33 Neighbor range sector

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D077 AA25 CA02 DC10 DC18 EA03 EA24 EA27 EA30 5D088 PP02 PP06 RR04 RR08 SS05 SS15 5D117 AA02 EE10 FF14

Claims (6)

[Claims] 1. A CL having a spiral information track.
A position determining method of a disk device for determining whether an optical head reading this information has reached a trace waiting position near a target position with respect to an optical disk to be recorded / reproduced. Reading the sector address of the target sector address, deriving the number of sectors in one round at the target sector address, and calculating the difference between the current sector address and the target sector address. Determining whether the number is within the number of neighboring determination sectors corresponding to the number of sectors in one round;
Controlling the optical head to wait for tracing when the number of sectors is within the neighborhood determination sector number. 2. A CL having a spiral information track.
V. An optical head for reading information on an optical disk to be recorded / reproduced, an optical head driving device for moving the optical head to a position near a target position of an information track, a track crossing signal detector for detecting and counting the track crossing of the optical head, and a track A traversing signal counter, a sector address detector that reads the sector address currently pointed to by the optical head to determine whether it is near the target position, and the number of physical one-turn sectors at the position of the optical head are calculated. Means for calculating the number of sectors, a subtractor for calculating a difference between the current sector address read from the sector address detector and the target sector address, and the result of the subtraction and the number of sectors in one physical round calculated by the means for calculating sector number. A comparator for comparing the number of corresponding neighborhood determination sectors, and an optical head based on the comparison result. Position determination device in a disk device provided with a determination means for determining whether to trace wait seek for. 3. A sector number storage means for storing the number of neighborhood determination sectors corresponding to the number of sectors in one physical round at each position on the optical disk, in place of the sector number calculation means in the position determination device according to claim 2. A position determining device for a disk device configured to compare a difference between a current sector address and a target sector address with the number of neighboring determination sectors stored in the sector number storage means. 4. A linear velocity measuring means for detecting a sector length, and a physical 1 at an arbitrary disk position by using this sector length.
A sector number correction calculating means for correcting and calculating the number of sectors in the circumference, the determining means based on a comparison result between the difference between the current sector address and the target sector address and the corrected calculated value,
4. The position judging device in a disk device according to claim 2, wherein it is determined whether to seek to the optical head or wait for tracing. 5. A linear velocity measuring means and a spindle speed memory for measuring a time for reading one sector,
A multiplexer for switching to use one of the linear velocity measuring means and the spindle speed memory, an additional sector calculator for calculating a sector to be added according to a time for reading one sector, and an additional sector calculator. Sector number adding means for adding the generated number of additional sectors and the number of sectors in one physical round is added, and the judging means compares the difference between the current sector address and the target sector address with the calculated sector number correction value. Based on the result,
4. The position judging device in a disk device according to claim 2, wherein it is determined whether to seek to the optical head or wait for tracing. 6. A linear velocity measuring means for detecting a sector length, and the physical length at an arbitrary disk position is determined by the sector length.
Sector number correction calculating means for correcting and calculating the number of circumferential sectors;
A linear velocity measuring means and a spindle speed memory for measuring the time for reading one sector; a multiplexer for switching to use data of one of the linear velocity measuring means and the spindle speed memory; An additional sector calculator for calculating a sector to be added based on the read time, and a sector for adding a value obtained by correcting and calculating the number of sectors in one physical round based on the number of additional sectors generated by the additional sector calculator and the sector length. Number determining means for determining whether to seek to the optical head or to wait for tracing based on a comparison result between the difference between the current sector address and the target sector address and the calculated sector number correction value. The position judging device in the disk device according to claim 2 or 3, wherein