JP2002251749A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device capable of accurately measuring eccentricity, and to provide a program therefor. SOLUTION: The device is provided with a lens 103 for receiving a light reflected on the disk 101, a detection part 11 for counting the number of track crossing times when the lens 103 comes across the track of the disk 101 in the inner circumference direction for every period specified so as to divide one rotation of the disk 101 into a plurality of sections and the number of track crossing times when the lens 103 comes across the track of the disk 101 in the outer circumference direction, and a counting part 12 and a measuring part 13 for detecting the eccentric component of the disk by using the number of track crossing times at the time of coming across the track in the inner circumference direction and the number of track crossing times at the time of coming across the track in the outer circumference direction.

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 represented by a drive and a program, and more particularly to an optical disk device and a program for measuring eccentricity of a disk.

[0002]

2. Description of the Related Art In recent years, the standard mounting of optical disk devices on personal computers has rapidly progressed, and optical disk devices have become indispensable as functions of personal computers along with hard disk drives. In addition, the performance and function of optical disk drives have been increasing day by day.

[0003] As one of such high performance and high function, it is required to process a disk in a high speed rotation area. In other words, various disks are used in the world from different manufacturers and factories, and when rotating such disks at high speed, performance and noise are reduced especially for eccentric disks that are off-center. Problems arise.

Therefore, by performing eccentricity measurement for checking the amount of eccentricity of the disk, the degree of eccentricity of the disk is checked to detect the eccentric disk, and a countermeasure is taken to prevent the detected eccentric disk from increasing its rotation speed. It has been subjected.

FIG. 10 shows a configuration of a conventional optical disk drive.

The rotation of the disk 101 is controlled by a spindle motor 102 provided in a driver 105.
A pickup 10 is attached to the rotating disk 101.
4 irradiates a laser beam onto the disk surface while moving in a radial direction from the inner peripheral side to the outer peripheral side of the disk, and reads data on the disk surface from a change in the reflected light.

[0007] Data called pits is spirally recorded on the disk surface and is generally called a track. The pickup 104 is supported by a wire in a housing in the pickup 104 in order to accurately read the data. By driving the lens 103 perpendicular to the disk surface, the laser beam is focused on the disk surface. Further, a deviation (tracking error signal) from the track center is detected by a change in the laser reflected light from the disk surface, and the lens 103 is driven horizontally in the radial direction with respect to the disk surface so that the laser beam CPU 106 performs tracking control so that it is located at the center.
Send and execute instructions.

The eccentricity measurement is performed with the focus servo ON and the tracking servo OFF. In this state, since the tracking servo is not turned on, the laser beam deviates from the track due to the eccentricity of the disk and the vibration of the optical disk device, and a tracking error signal is generated. A tracking error signal generated in this way is shown at 112 in FIG. Also, reference numeral 111 in FIG. 11 denotes a binarized signal of the tracking error signal, and a value obtained by counting the binarized signal 111 of the tracking error signal by one set 113 of H and L is called a track crossing number.

FIG. 12 shows a range of a predetermined period 121 used when performing eccentricity measurement. The predetermined period 121 is set so that one rotation of the disk can be equally divided into a plurality of rotations.
The eccentricity measurement is performed using the number of track crosses counted for each predetermined cycle indicated by 121F for one rotation of the disk. In other words, if the number of track crosses is counted every 60 degrees, the count value of the number of track crosses is six for one rotation of the disk.

FIG. 13 shows a tracking error signal 111 and a binary signal 131 of a radial contrast signal.
Conventionally, the direction detection unit 107 shown in FIG. 10 uses the tracking error signal 111 and the binary signal 131 of the radial contrast signal to
Of the radial contrast signal 131 at the falling edge or the rising edge 132 of H
Alternatively, the plus count 133 and the minus count 134 are determined based on L.

FIG. 14 is a conceptual diagram showing the direction of the number of track crosses. As shown in FIG. 14, the counter of the track crossing number detecting unit 108 shown in FIG.
When crossing 1 in the outer circumferential direction, 142 is counted up by 13
3, minus 143 when crossing in the inner circumferential direction
At 34, a signed count value is detected at predetermined intervals according to the determination by the direction detection unit 107.

[0012]

FIG. 15 shows an example in which the number of track crosses is detected. Conventionally, as shown in FIG. 15, in the direction in which the lens traverses the track, a minus count is set when the lens traverses inward of the disc, and a plus count is set when the lens traverses outward. By calculation, the signed count value 15
2

For this reason, as in the case of the portion 161 of the radial contrast signal 131 in FIG. Also, as shown in FIG. 17, the radial contrast signal 131 becomes 171 due to the phase advance, so that even if the track crossing number actually counts 173 incorrectly as the minus count 172 at the plus count, even if the track crossing number actually counts 173 as a minus count 172, Since there is only one signed count value 152, an erroneous count cannot be determined, and subsequent correction cannot be performed. Therefore, highly accurate eccentricity measurement could not be performed.

That is, the conventional disk drive cannot correct erroneous counting of track crosses when measuring the eccentricity of the disk, and therefore cannot perform highly accurate eccentricity measurement. is there.

An object of the present invention is to provide an optical disk device and a program capable of performing highly accurate eccentricity measurement in consideration of the above problems.

[0016]

In order to solve the above-mentioned problems, a first aspect of the present invention (corresponding to claim 1) is to move relatively to a track of a disk and to record on the disk. A lens that receives the reflected light from the disk, including a signal that has been performed, and a predetermined period determined so that one rotation of the disk can be equally divided into a plurality of sections,
A counter that counts the number of track crosses when the lens traverses the track of the disk in the inner circumferential direction and the number of track crosses when the lens traverses the track of the disk in the outer circumferential direction; An optical disk apparatus comprising: a processing unit for detecting an eccentric component of the disk by using the number of track crosses when the disk crosses the disk and the number of track crosses when the disk crosses the outer peripheral direction.

Further, the second invention (corresponding to claim 2)
Is a lens that is movable relative to the tracks of the disk and receives light reflected from the disk, including a signal recorded on the disk, and equally divides one rotation of the disk into a plurality of sections. The number of track crosses when the lens traverses the track of the disk, and the number of track crosses when the lens traverses the track of the disk in any one of the outer circumferential direction and the inner circumferential direction at predetermined predetermined intervals. A counter for counting the number of track crosses, and processing means for detecting an eccentric component of the disk by using the number of track crosses when crossing and the number of track crosses when crossing in one direction. An optical disk device.

Further, the third invention (corresponding to claim 3)
Using the counted number of track crosses,
Detecting means for detecting a section in which the lens crosses the track of the disc in only one of the inner circumferential direction and the outer circumferential direction; and in the detected section, the lens crosses the track of the disc. Correction means for correcting the count value of the number of track crosses in a direction different from the direction when the count value exists.
According to another aspect of the present invention, there is provided the optical disc device according to any one of the first to third aspects of the invention.

The fourth invention (corresponding to claim 4)
Detecting a section that crosses only in any one of the directions means detecting other sections of the sections except the two sections from the one having the smallest count value of the number of track crosses. An optical disc device according to a third aspect of the present invention.

Further, the fifth invention (corresponding to claim 5)
The correction is performed by comparing the count value of the number of track crosses in which the lens traverses tracks of the disk in the inner circumferential direction with the count value of the number of track crosses traversing in the outer circumferential direction in the detected section. If the counter value of the number of track crosses crossing in the inner circumferential direction is larger than the counter value of the number of track crosses crossing in the outer circumferential direction, the number of track crosses crossing in the outer circumferential direction is larger than the counter value of the number of track crosses crossing in the inner circumferential direction. If the counter value of the number of track crosses crossing in the outer circumferential direction is set to 0, and the counter value of the number of track crosses crossing in the outer circumferential direction is larger than the counter value of the number of track crosses crossing in the inner circumferential direction, The counter value of the number of track crosses crossing in the outer peripheral direction is added to the counter value of the number of track crosses crossing in the inner peripheral direction. Adding pointer value, an optical disk apparatus according to the present invention of the third or 4 which is performed by the track cross counter for the number of values across the inner circumferential direction is 0.

The sixth invention (corresponding to claim 6)
Is an optical disk device that detects an eccentric component of the disk by using the number of track crosses counted at a first predetermined period so that one rotation of the disk can be equally divided into a plurality of sections. A lens that is movable relative to a track and includes a signal recorded on the disk, and that receives light reflected from the disk; and that the lens traverses tracks on the disk in an inner circumferential direction or Determining means for determining whether the signal has crossed in the outer circumferential direction; a first time during which the binarized signal of the tracking error signal included in the reflected light is a time of a Hi section or a Low section; A second time from the start of the measurement to the appearance of the edge of the binary signal of the comprehensive line signal of the reproduced sum signal, which is the sum of the reflected lights received by the lens; And a correction means for correcting the result determined by the determination means to be reversed when the first time and the second time do not satisfy a predetermined condition. The number is an optical disk device that is counted based on a result corrected by the correction unit.

A seventh aspect of the present invention (corresponding to claim 7)
Comprises a first time counter that counts the first time at a second predetermined cycle, and a second time counter that counts the second time at the second predetermined cycle. 6 is an optical disk device according to the present invention.

The eighth invention (corresponding to claim 8)
Means that the predetermined condition is that half the value of the first time is smaller than the second time.
An optical disk device according to the present invention.

The ninth invention (corresponding to claim 9)
Is an optical disc device in which all or some of the functions of all or some of the first to eighth aspects of the present invention are realized by a microcomputer.

According to a tenth aspect of the present invention (corresponding to claim 10), the optical disk apparatus according to the first aspect of the present invention is movable relative to a track of the disk and recorded on the disk. A lens that receives the reflected light from the disk, including a signal that is reflected by the disk, and the lens moves the track of the disk in an inner circumferential direction at predetermined intervals determined so that one rotation of the disk can be equally divided into a plurality of sections. A counter which counts the number of track crosses when the lens crosses the track of the disk in the outer circumferential direction, the number of track crosses when the lens crosses the track of the disk in the outer circumferential direction, the number of track crosses when the lens crosses the inner circumferential direction, The computer functions as all or a part of processing means for detecting an eccentric component of the disk by using the number of track crosses when crossing in the outer peripheral direction. It is a program for.

According to an eleventh aspect of the present invention (corresponding to claim 11), the optical disk apparatus according to the second aspect of the present invention is movable relative to a track of the disk and recorded on the disk. A lens that receives the reflected light from the disk, including a signal that is reflected from the disk, and when the lens traverses a track on the disk at predetermined intervals determined so that one rotation of the disk can be equally divided into a plurality of sections. A counter that counts the number of track crosses, the number of track crosses when the lens traverses the track of the disk in one of the outer circumferential direction and the inner circumferential direction, and the number of track crosses when the lens traverses the track. A computer is used as a whole or a part of processing means for detecting an eccentric component of the disk using the number of track crosses when the disk crosses in one direction. Is a program of the order to.

According to a twelfth aspect of the present invention (corresponding to claim 12), the optical disk device according to the sixth aspect of the present invention is movable relative to a track of the disk and recorded on the disk. A lens that receives reflected light from the disk, a determination unit that determines whether the lens has traversed a track on the disk in an inner circumferential direction or an outer circumferential direction, and included in the reflected light. A reproduction in which the binarized signal of the tracking error signal is a period of a Hi section or a Low section and the sum of the reflected light received by the lens from the start of the measurement of the first time. Measuring a second time which is a time until an edge of the binarized signal of the comprehensive signal of the sum signal appears, and when the first time and the second time do not satisfy a predetermined condition, Serial is a program for causing a computer to function as all or part of the correction means determining means corrects to reverse the result of the determination.

Next, the operation of the present invention will be described.

The optical disk device of the present invention is provided with a track crossing number detector (FIG. 2-21) which can determine the direction in which the lens has traversed the track by the microcomputer. For example, a counter (FIG. 2-22) that counts the number of track crosses in which the lens traverses tracks in the inner circumferential direction of the disk and a counter (FIG. 2-23) that counts the number of track crosses in which the lens traverses tracks in the outer circumferential direction. Thus, the direction in which the lens has traversed the track can be determined. Then, the number of track crosses is counted in consideration of the phase advance of the radial contrast at every predetermined cycle. By using the method of the present invention, the count value of the number of two track crosses in each predetermined cycle (FIGS. 2-22 and 23)
Can be obtained. Therefore, the two count values are compared every predetermined period, and if there is a count value that does not satisfy the predetermined condition, a correction is made. In addition, since it is executed by a microcomputer, it can be executed without having a special function for eccentricity measurement.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk drive according to the present invention uses the number of track crosses counted for each predetermined period to determine the eccentric component of the disk at a predetermined period determined so that one rotation of the disk can be equally divided into a plurality of rotations. In the eccentricity measurement to be extracted, a counter A for counting the number of track crosses when the lens traverses the track in the inner circumferential direction at every predetermined period determined so that one rotation of the disk can be equally divided into a plurality of rotations, By providing a counter B for counting the number of track crosses when the track crosses in the outer circumferential direction, the count value of the counter A and the count value of the counter B are compared at predetermined intervals, and an erroneous count value can be found.

Further, in the disk device of the present invention, the eccentric component of the disk is extracted by using the number of track crosses counted for each predetermined period at a predetermined period determined so that one rotation of the disk can be equally divided into a plurality. In the eccentricity measurement, the counter C counts the total number of track crosses in which the lens traverses the track at every predetermined period determined so that one rotation of the disk can be equally divided into a plurality of rotations. Alternatively, by providing a counter D that counts the number of track crosses in one direction crossing the outer circumference direction, the count value of the counter C and the count value of the counter D are compared at predetermined intervals, and an erroneous count value can be found. .

Further, the disk device of the present invention can be executed without having a special function for eccentricity measurement by executing the means described in the present invention by a microcomputer.

Also, the disk device of the present invention has a time A during which the tracking error signal changes from H to L or a time until the tracking error signal changes from L to H; Is H to L or
By measuring the time B from the change from L to H, the time A
If the predetermined condition is not satisfied by the comparison between the time and the time B, the apparatus is provided with a direction correction means for performing counting in the reverse direction in which the lens is determined to be in the direction crossing the track. The accuracy of counting the number of crosses can be improved.

Further, the disk device of the present invention measures a section until the tracking error signal changes from H to L or a section from L to H using a counter that counts at a constant cycle A. Counter value A and the radial contrast signal
From the interval from L to H or from L to H using a counter that counts at a constant cycle A
If the predetermined condition is not satisfied by comparing the counter value A and the counter value B by measuring the counter value A, a direction correcting unit that performs counting in the reverse direction in which the lens is determined to be in the direction crossing the track is provided. By performing the correction, the accuracy of counting the number of track crosses can be improved.

In addition, the disk device of the present invention has a value obtained by measuring a section until the tracking error signal changes from H to L or a section from L to H under the predetermined conditions described in the present invention. The value of half of A is from H to L or
By setting a condition smaller than the measured value B in the section from L to H, accurate direction correction can be executed.

Further, in the disk apparatus of the present invention, the lens is provided such that the lens moves in only one of the inner circumferential direction and the outer circumferential direction of the disk in the count value of the number of track crosses obtained by counting one rotation of the disk at predetermined intervals. A detection section that detects a section that crosses the track, and the lens crosses the track in a section where the lens crosses the track in only one of the inner circumferential direction and the outer circumferential direction of the disk, detected by the detecting section. If the counter in the direction different from the direction has a count value, a correction means for executing count correction is provided, so that the accuracy of counting the number of track crosses can be improved by executing the correction.

Further, in the disk device of the present invention, the detecting section of the present invention is configured such that the means described in the present invention counts the number of track crosses counted for one rotation of the disk at predetermined intervals by the means described in the present invention. A counting unit for detecting the number of track crosses in which the lens has crossed the track at predetermined intervals from the count value of the number of track crosses detected, and The lens crosses the track in either the inner or outer direction of the disk by using a detector that detects the track cross count value measurement location other than the two track cross count value measurement locations. Can be detected.

Further, in the disk device of the present invention, the correcting means of the present invention may be used in such a manner that the lens for each predetermined cycle is used in a section where the lens crosses the track in one of the inner circumferential direction and the outer circumferential direction of the disk. Counter value An of the number of track crosses traversing the disk in the inward direction and counter value of the number of track crosses traversing the disk in the outer direction.
Compare the value of Bn, and if the counter value An is greater than the counter value Bn, add the value of the counter value Bn to the counter value An to set the counter value Bn to 0, and conversely, the counter value Bn becomes the counter value
If the number is greater than An, the accuracy of counting the number of track crosses can be improved by performing the correction by using a correction unit that performs the correction that makes An equal to 0 by adding the value of the counter value An to the counter value Bn.

Hereinafter, the configuration of the embodiment of the present invention will be described together with its operation with reference to the drawings.

(Embodiment 1) First, Embodiment 1 will be described.

An optical disk device according to the first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a diagram schematically showing a processing unit necessary for executing eccentricity measurement.

The track cross detector 11 obtains the number of track crosses for each predetermined cycle. Then, the counting unit 1
In order to judge whether the disc is an eccentric disc in 2,
A calculation process for finding a value to be compared with the threshold is executed. Then, the measurement unit 13 detects the result of the eccentricity measurement by comparing with the set threshold value.

At this time, the track cross detector 11 counts the number of track crosses at predetermined intervals so that the direction in which the lens crosses the track can be determined.

FIG. 3 shows a method for detecting the number of track crosses. Here, the track cross number detectors 31 and 3 in FIG.
2 corresponds to the track cross detection unit 11 in FIG. 1, the counting unit 19 in FIG. 3 corresponds to the counting unit 12 in FIG. 1, and the measurement unit 20 in FIG. 3 corresponds to the measurement unit 13 in FIG. It is assumed that they are supported.

In FIG. 3, the lens 103 is the track 14
1 at predetermined intervals by using a track cross number detecting unit 32 for counting the number of track crosses crossing in the outer circumferential direction 34 of the disk 101 and a track cross number detecting unit 31 for counting the number of track crosses crossing in the inner circumferential direction 35. To count the number of track crosses.

As described above, the number of track crosses in each direction across the track of the lens is detected at predetermined intervals, and
By comparing the count values at predetermined intervals, if a value exists in the count value that is not in the direction in which the lens crosses the track in a section where the lens crosses the track in one direction, the count is incorrect. You can judge that.

For example, as shown in FIG. 2, it is assumed that the count value of the number of track crosses in the inner circumferential direction becomes 5 and the count value of the number of track crosses in the outer circumferential direction becomes 1 during one section. It is assumed that this section is a section where the lens crosses the track in one direction. Then, it is understood that the count value in the outer circumferential direction is a value counted by an erroneous count. A method of determining whether the lens is in a section that crosses the track in one direction will be described later.

The method of detecting the number of track crosses according to the present embodiment is not limited to the method described with reference to FIG. 3, but may be as follows.

That is, FIG. 4 shows another method of detecting the number of track crosses.

The track crossing number detecting section 4 shown in FIG.
1 and 42 correspond to the track cross detection unit 11 of FIG. 1, the counting unit 19 of FIG. 4 corresponds to the counting unit 12 of FIG. 1, and the measuring unit 20 of FIG. Shall be supported.

The track cross detector 41 counts the total number 43 of track crosses in which the lens 103 crosses the track 141 in the track cross detector 11.
A track crossing number detecting unit 42 for counting the number of track crosses in which the lens traverses the track in the outer circumferential direction 44 or a track crossing number detecting unit for counting the number of track crosses in the inner circumferential direction is used. In this way, by counting the total number of tracks crossing the track 141 and the number of track crosses crossing the track in one of the outer circumferential direction 44 and the inner circumferential direction, the number of track crosses crossing in the other direction is calculated. Can also be obtained by a simple calculation. Therefore, an erroneous count can be determined in the same manner as described above.

Further, by executing the functions of the above-mentioned respective parts by a microcomputer, it is possible to execute the eccentricity measurement without having a special function for the eccentricity measurement.

(Embodiment 2) Next, Embodiment 2 will be described with reference to FIGS.

FIG. 5 shows an example of the tracking error signal and the radial contrast signal.

In FIG. 5, reference numeral 51 denotes a binary signal of a tracking error signal, and reference numeral 52 denotes a binary signal of a radial contrast signal.

As described above, the direction across the track of the lens is determined using the two binarized signals.
When judging the direction based on the two signals, in the portion 53 where the cycle is early, due to the influence of the time constant by the filter setting,
As the phase of the radial contrast signal 52 advances, and the phase advances to the position of the radial contrast signal 52A as shown in an enlarged portion 54 of the portion 53 having the earlier cycle, at the falling edge 55 of the tracking error signal 51,
The radial contrast signal 52A is H, whereas the radial contrast signal 52A is L. If the H and L of the radial contrast signal change, the direction in which the lens crosses the track also changes, resulting in an erroneous count.

Therefore, a countermeasure against erroneous counting according to the present embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating a countermeasure against such an erroneous count. FIG.
, The detection unit 63 corresponds to the direction detection unit 107 in FIG.

In FIG. 6, the tracking error signal 6
The detection unit 63 measures the time 64A of the L section 64 of one. Radial contrast signal 62 from the start of measurement at time 64A
The detection unit 63 measures the time 65A of the section 65 up to the edge 66 at the same time as the time 64A.

If the relationship between the measured time 64A and the measured time 65A does not satisfy the predetermined condition described below, it is determined that an erroneous count has occurred due to phase advance, and the count value of the number of track crosses at this time is determined by the counter in the opposite direction. Add a count to. The L section 64 of the tracking error signal 61 according to the present embodiment is an example of the Low section of the binarized signal of the tracking error signal according to the present invention, and is adjacent to the L section of the tracking error signal 61 according to the present embodiment. The section up to the value of the next L section in the section is an example of the Hi section of the binarized signal of the tracking error signal of the present invention, and the time of the L section 64 of the present embodiment is the first section of the present invention. This is an example of time, and the radial contrast signal 62 according to the present embodiment.
The time 65A of the section 65 up to the edge 66 is an example of the second time of the present invention, and the radial contrast signal of the present embodiment is a reproduced sum signal which is the sum of the reflected light received by the lens of the present invention. 3 is an example of the comprehensive line signal.

Further, the measurement of the time of the section 64 and the time of the section 65 in FIG. 6 is executed by using a counter which performs counting under a certain condition.

The above predetermined conditions will be described with reference to FIG. Falling edge 7 of tracking error signal 71
A section 77 from 3 to an edge 74 of the radial contrast signal 72 is an ideal signal (radial contrast signal 7).
In 2), it is half of the section 76.

However, in the early part of the cycle, the radial contrast signal 72 becomes the radial contrast signal 72A,
Phase advance occurs like 72B, 72C, 72D.

The radial contrast signal 72A is changed from 0 to 9 according to the phase advance of the radial contrast signal 72.
A signal whose phase has advanced by 0 degrees, and is from edge 73 to edge 74A.
The section 77A up to is shorter than half of the section 76. At this time, at the edge 73, the radial contrast signal 72A indicates L similarly to the radial contrast signal 72, so that the direction can be accurately determined. In other words, a signal obtained by leading the phase of the radial contrast signal 72 by 0 to 90 degrees from the radial contrast signals 72 and 72A is represented by the following equation 1, and the direction determination is accurate.

[0065]

0 <section 77A ≦ (section 76 ÷ 2) Next, the radial contrast signal 72B is a signal in which the phase of the radial contrast signal 72A is further advanced (a signal in which the phase of the radial contrast signal 72 is advanced by 90 to 180 degrees). , At the edge 73, the radial contrast signal 72B indicates H, and the direction determination has failed, resulting in an erroneous count. At this time, the radial contrast signal 72 becomes 1
Until the signal 72C before the phase advances by 80 degrees,
From the edge 73 to the edge 75 of the radial contrast signal
Sections 77B and 77C up to B and 75C are longer than half of section 76. Therefore, the signal in which the phase of the radial contrast signal 72 is advanced by 90 to 180 degrees is as shown in the following Expression 2, and the direction determination is erroneous.

[0066]

## EQU2 ## Section 77B> (section 76 ÷ 2) From the above, if the following condition 3 is satisfied, an erroneous count is generated due to the phase advance of the radial contrast signal, so that the correction is made.

[0067]

(Section 76 ÷ 2) <section 77 At this time, the radial contrast signal 72 becomes 180 to 24.
In the signal 72D which has advanced the phase by 0 degrees, the section 77D from the edge 73 to the edge 75D is shorter than half of the section 76, but since the radial contrast signal 72D indicates H at the edge 73, the direction determination is erroneously made. I have. Therefore, the condition of Equation 3 is not satisfied, but the direction is erroneously determined and the counting is erroneous. However, there is no problem since the phase does not advance by more than 180 degrees in actual use of the optical disk device.

Third Embodiment Next, a third embodiment will be described with reference to FIGS.

The optical disk device of the present embodiment can determine the rotation of the disk for each rotation and the direction in which the lens has traversed the track at predetermined intervals by a predetermined period determined so that one rotation of the disk can be equally divided into a plurality. After obtaining the number of track crosses counted in the above, the section in which the lens crosses the track in one direction is detected by the detection method described below, and in the section in which the lens crosses the track in one direction, Adds the correction means described below so that the count value of the number of track crosses is obtained only in the direction in which the lens crosses the track.

FIG. 8 shows such a correction means. In addition,
The correction means of the present embodiment corresponds to the direction detection unit 107 in FIG. In other words, using the eccentric disk 81 shown in FIG. 8, for a disk whose center 82 is slightly displaced, such as the eccentric disk 81, when the disk is rotated, the position 83 of the lens becomes a fixed distance from the center. However, since the disk is an eccentric disk 81, the lens 141 moves the track 141 in the outer peripheral direction 84 (a section below half of the disk 81) and the inner peripheral direction 84.
5 (section above half of the disk 81).

From this, it can be seen that the lens crosses the track 141 in the outer circumferential direction and the inner circumferential direction during one rotation of the disk. In addition, the lens 86 moves across the track 141 from two points at two points 86 where the lens crosses the track 141 in the outer circumferential direction of the disk 81 and the point 87 where the lens crosses the track 141 in the inner circumferential direction of the disk 81. It can be seen that the count value traversed in the direction is the same as the count value traversed in the outer peripheral direction.

In each of the sections 121C and 121F including the time when the direction in which the lens traverses the track changes, at points 86 and 86 where the lens traverses the track 141,
In the sections 121A, 121B, 121D, and 121E where there is no 87 and the lens traverses in one direction, there is a point where the lens traverses the track 141 at each location. The number of track crosses (the total number of track crosses) in which the lens crosses the track is counted in the sections 121C and 121F including the time when the lens changes, in the sections 121A, 121B, 121D and 121E in which the lens crosses in one direction. It turns out that it becomes less than the total number of track crosses counted respectively.

Therefore, as shown at 33 in FIG. 3 and at 41 in FIG. 4, the number of track crosses acquired at predetermined intervals and counted so that the direction in which the lens traverses the track can be determined from the number of track crosses traversed by the lens. Detects the total number of track crosses in the number of crosses, and counts the total track crosses for each predetermined period.
Values are detected. Periodic sections 121 other than the periodic sections 121C and 121F in which two small count values are counted.
In A, 121B, 121D, and 121E, detection is performed as a section where the lens crosses the track in one direction.

Further, the correction means is provided while the lens traverses the track in one direction, that is, while the lens
Between sections A and 121B and between sections 121D and 121E, correction is made so that the number of track crosses is counted only in the direction in which the lens crosses the track. For example, the number of track crosses counted as the direction in which the lens traverses the track at every predetermined period is the outer circumferential direction or the inner circumferential direction is as shown in FIG.

From the section having the smallest value of the total number of track crosses for each predetermined period in the above-described detection unit, the number
The sections are A2, B2 and A5, B5. Therefore, at locations other than this location, the magnitudes of the track cross numbers A and B at predetermined intervals are compared, and in actual use, the correct count number can be considered to be larger than the erroneous count number. , A process of adding the smaller value to and making the smaller value 0. As described above, the optical disc device of the present embodiment can correct an erroneous count, and thus can perform highly accurate eccentricity measurement.

The track crossing number detecting section of the present embodiment is an example of the counter of the present invention, and the counting section and measuring section of the present embodiment are examples of the processing means of the present invention. Is an example of the detecting means of the present invention, the direction detecting section of the present embodiment also serves as the correcting means of the present invention, and the direction detecting section of the present embodiment also serves as the determining means of the present invention. ing.

It should be noted that the present invention provides all or some of the means (or the device, element,
This is a program for causing a computer to execute the functions of a circuit, a unit, and the like, and is a program that operates in cooperation with the computer.

Note that some means (or devices, elements, circuits, units, and the like) of the present invention mean some of the plurality of means, or one of the means. Means some of the functions.

The present invention also includes a computer-readable recording medium on which the program of the present invention is recorded.

Further, one usage form of the program of the present invention may be such that the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.

Further, one usage of the program of the present invention may be a mode in which the program is transmitted through a transmission medium, read by a computer, and operates in cooperation with the computer.

The recording medium includes a ROM and the like, and the transmission medium includes a transmission medium such as the Internet,
Light, radio waves, sound waves, etc. are included.

Further, the computer of the present invention described above
It is not limited to pure hardware such as a CPU, but may include firmware, an OS, and peripheral devices.

As described above, the configuration of the present invention may be realized by software or hardware.

[0085]

As is apparent from the above description, the present invention provides an optical disk apparatus and a program capable of improving the accuracy of the eccentricity measurement by improving the accuracy of the count value of the number of track crosses. Can be provided.

Further, the present invention provides an optical disc apparatus and a program which can execute eccentricity measurement without having a special eccentricity measurement function by executing a count detecting section by a microcomputer. Can be done.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an optical disk device according to Embodiments 1 to 3 of the present invention.

FIG. 2 is a diagram illustrating an example of an erroneous count according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a method for detecting the number of track crosses according to the first and third embodiments of the present invention.

FIG. 4 is a diagram showing a method for detecting the number of track crosses according to the first and third embodiments of the present invention.

FIG. 5 is a diagram showing a phase shift of a radial contrast signal according to the second embodiment of the present invention.

FIG. 6 is a diagram showing a method for detecting a phase advance in Embodiment 2 of the present invention.

FIG. 7 is a diagram showing a method for detecting a phase advance in Embodiment 2 of the present invention.

FIG. 8 is a diagram showing a direction of a track cross in Embodiment 3 of the present invention.

FIG. 9 is a diagram showing a method of correcting the number of track crosses according to the third embodiment of the present invention.

FIG. 10 is a configuration diagram of an optical disk device according to a conventional technique.

FIG. 11 is a diagram showing a tracking error signal of an optical disk device according to a conventional technique.

FIG. 12 is a diagram showing a predetermined cycle range of an optical disk device according to a conventional technique.

FIG. 13 is a diagram showing a direction detection method of an optical disk device according to a conventional technique.

FIG. 14 is a conceptual diagram illustrating the direction of the number of track crosses of an optical disk device according to a conventional technique.

FIG. 15 is a diagram showing a method of detecting the number of track crosses in a conventional optical disk device.

FIG. 16 is a diagram showing a case where an erroneous count due to chattering of a conventional optical disc device is performed.

FIG. 17 is a diagram showing a case where an erroneous count due to a phase advance of a conventional optical disc device is performed

[Explanation of symbols]

11, 21 Track crossing number detecting unit 12 Counting unit 13 Measuring unit 22 Detecting value in inner circumferential direction 23 Detecting value in outer circumferential direction 31 Track cross detecting unit (inner circumferential direction) 32, 42 Track cross detecting unit (outer circumferential direction) 33 Total track crossing Numerals 34, 44, 85, 142 The direction in which the lens crosses the track (outer circumference direction) 35, 84, 143 The direction in which the lens crosses the track (inner circumference direction) 41 The track crossing number detection unit (all counts) 43 The lens is the track 51, 61, 71, 111 Tracking error signal (binarized signal) 52, 62, 72, 131 Radial contrast signal 52A, 72A, 72B, 72C, 72D, 171 Radial contrast signal (phase advance) 53 53 Early part 54 Enlarged view of early part 55, 73 Track Falling edge of tracking error signal 63 Time detector 64, 76 L section of tracking error signal 65, 77, 77A, 77B, 77C, 77D Section from start of L section measurement of tracking error signal to the next edge of radial contrast signal 66 Next edge of radial contrast signal from start of L section measurement of tracking error signal 74, 74A, 74B, 74C, 74D Radial contrast signal rising edge 75B, 75C, 75D Radial contrast signal falling edge 81 Eccentric disk 82 Disk Center 83 Lens position 86 Point where lens crossed track (outer circumference direction) 87 Point where lens crossed track (inner circumference direction) 101 Disk 102 Spindle motor 103 Lens 104 Pickup 105 Driver 106 CPU 1 07 Direction detection unit 108, 151 Track cross detection unit 112 Tracking error signal (analog) 113 Track cross number 1 count 121 Dividing line (60 degrees) in predetermined cycle 121A, 121B, 121C, 121D, 121E, 12
1F Range of each predetermined period 132 Edge of tracking error signal 133 Plus count judgment point 134 Minus count judgment point 141 Track 152 Track crossing count value by conventional method 161 Chattering point 162 Erroneous count value due to chattering 172 Phase leading point 173 Phase leading point Wrong count value

Claims (12)

[Claims] A lens which is movable relative to a track of the disk and receives light reflected from the disk, including a signal recorded on the disk, and The number of track crosses when the lens traverses the track of the disk in the inner circumferential direction and the track when the lens traverses the track of the disk in the outer circumferential direction for each predetermined cycle determined so that the track can be divided into sections. A counter for counting the number of crosses, processing means for detecting the eccentricity component of the disk using the number of track crosses when crossing in the inner circumferential direction and the number of track crosses when crossing in the outer circumferential direction; Optical disk device equipped with 2. A lens which is movable relative to the track of the disk and receives light reflected from the disk, including a signal recorded on the disk, and For each predetermined period determined to be able to be divided into sections, the number of track crosses when the lens traverses the track of the disk, and the lens moves the track of the disk in one of the outer circumferential direction or the inner circumferential direction. A counter for counting the number of track crosses when crossing, processing means for detecting an eccentric component of the disk using the number of track crosses when crossing and the number of track crosses when crossing in one direction; Optical disk device equipped with 3. A detecting means for detecting, using the counted number of track crosses, a section in which the lens crosses a track of the disk only in one of an inner circumferential direction and an outer circumferential direction, And a correcting means for correcting a count value of a track crossing number in a direction different from a direction in which the lens traverses a track of the disk in the specified section. 3. The optical disk device according to any one of 2. 4. Detecting a section that crosses only in any one direction means that other sections except for the two sections from the one having the smallest count value of the number of track crosses among the sections. 4. The optical disk device according to claim 3, wherein the optical disk device detects the error. 5. The method according to claim 1, wherein, in the detected section, the count value of the number of track crosses in which the lens traverses the track of the disk in the inner circumferential direction and the count value of the number of track crosses in the outer circumferential direction. In comparison, when the counter value of the number of track crosses crossing in the inner circumferential direction is larger than the counter value of the number of track crosses crossing in the outer circumferential direction, the counter value of the number of track crosses crossing in the inner circumferential direction crosses in the outer circumferential direction. The counter value of the number of track crosses crossing in the outer circumferential direction is set to 0 by adding the counter value of the number of track crosses, and the counter value of the number of track crosses crossing in the inner circumferential direction is good. If there are many, the counter value of the number of track crosses crossing in the outer peripheral direction is added to the track cross number crossing in the inner peripheral direction. 5. The optical disk device according to claim 3, wherein the counter value of the number of tracks is added, and the counter value of the number of track crosses crossing in the inner circumferential direction is set to 0. 6. An optical disk apparatus for detecting an eccentric component of a disk by using a track cross number counted at a first predetermined period so that one rotation of the disk can be equally divided into a plurality of sections. Can be moved relative to the tracks on the disc,
A lens that receives reflected light from the disk, including a signal recorded on the disk, and a determination unit that determines whether the lens has traversed the track of the disk in an inner circumferential direction or an outer circumferential direction, 2 of the tracking error signal contained in the reflected light
A first time during which the quantified signal is a Hi section or a Low section, and a comprehensive line signal of a reproduced sum signal that is the sum of the reflected lights received by the lens from the start of the measurement of the first time. A second time, which is a time until an edge of the quantified signal appears, is measured. If the first time and the second time do not satisfy a predetermined condition, a result determined by the determination unit is determined. An optical disk device, comprising: a correction unit that corrects the track crossing, wherein the track cross number is counted based on a result corrected by the correction unit. 7. A first time counter that counts the first time at a second predetermined cycle, and a second time counter that counts the second time at the second predetermined cycle. 7. The optical disk device according to claim 6, further comprising: 8. The optical disk device according to claim 6, wherein the predetermined condition is that a value of half of the first time is smaller than the second time. 9. An optical disk device in which all or some of the functions of all or some of the means according to claim 1 are realized by a microcomputer. 10. A lens of the optical disk device according to claim 1, which is movable relative to a track of the disk and receives reflected light from the disk, including a signal recorded on the disk. The number of track crosses when the lens traverses the track of the disk in the inner circumferential direction and the number of track crosses of the disk when the lens crosses the track of the disk in the inner circumferential direction at predetermined intervals determined so that one rotation of the disk can be equally divided into a plurality of sections. A counter that counts the number of track crosses when the disk crosses the outer circumference direction, the number of track crosses when the disk crosses the inner circumference direction, and the number of track crosses when the disk crosses the outer circumference direction. A program for causing a computer to function as all or a part of processing means for detecting an eccentric component. 11. A lens of the optical disk device according to claim 2, wherein the lens is movable relative to a track of the disk and receives light reflected from the disk, including a signal recorded on the disk. The number of track crosses when the lens traverses the track of the disk, and the lens crosses the track of the disk in the outer circumferential direction or at every predetermined period determined so that one rotation of the disk can be equally divided into a plurality of sections. A counter that counts the number of track crosses when crossing in any one of the inner circumferential directions, and the number of track crosses when crossing and the number of track crosses when crossing in one direction. A program for causing a computer to function as all or a part of processing means for detecting an eccentric component. 12. A lens of the optical disk device according to claim 6, which is movable relative to a track of the disk and receives light reflected from the disk, including a signal recorded on the disk. Determining means for determining whether the lens has crossed the track of the disk in the inner circumferential direction or the outer circumferential direction; and wherein the binarized signal of the tracking error signal included in the reflected light is in a Hi section or a Low section. From the start of measurement of the first time to the appearance of the edge of the binary signal of the comprehensive line signal of the reproduced sum signal, which is the sum of the reflected light received by the lens. A second time, which is a time, is measured, and when the first time and the second time do not satisfy a predetermined condition, correction is made to reverse the result determined by the determination means. Program for causing a computer to function as all or part of the correction means.