JPH1083537A - Tilt correcting method for optical disk device and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device in which a tilt correction against the warpage of an optical disk is quickened and stabilized, and power consumption is reduced. SOLUTION: This optical disk device has a head carrier part 3 moving an optical head 2 in the radial direction of an optical disk 1 while holding it, a guide part 4 guiding the part 3, an inclination setting mechanism for guide part 5 setting the inclination of the head carrier part 3 arbitrarily with the guide part 4, a tilt sensor 11 detecting the tilt quantity of the optical disk 1 by being loaded on the head carrier 3 and a control part for tilt correction 12 maintaining the optical axis of the optical head 2 in an optimal state by setting the guide part 4 in a prescribed angle according to the detected tilt quantity. Then, a mean value of tilts is calculated preliminarily by measuring tilt changes of the radial direction of the optical disk 1 and next an inclination corresponding to the average tilt quantity is set in the guide part 4 to set the optical axis of the optical head 2 in a state roughly vertical with respect to the optical disk 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus, and more particularly, to an optical disk apparatus provided with a means for correcting a tilt amount (warp of an optical disk surface: indicated by an angle) generated between the optical disk and the optical disk due to the curved deformation of the optical disk. The present invention relates to a tilt correction method for an optical disk device and an optical disk device.

[0002]

2. Description of the Related Art Hitherto, a situation in which writing or reading of information to or from an optical disk is hindered by micro-curvature that occurs over the entire surface of the optical disk has often occurred. In order to remedy such inconvenience, in recent years, as disclosed in, for example, JP-A-2-94115 and JP-A-62-62439, the deformation of an optical disc is corrected by controlling the position of an optical head. ,
Various methods of following (tilt correction) of the optical head with respect to the deformation of the optical disk have been developed.

[0003] Separately, as a tilt correction mechanism of an optical disk apparatus, for example, Japanese Patent Laid-Open No. 7-272301 is disclosed.
JP, JP-A-6-162541 and JP-A-6-162541
As disclosed in Japanese Patent Application Publication No. 1084195, there is a structure in which tilt correction is performed by operating optical components such as a collimator lens and an objective lens inside an optical head and a galvanometer mirror.

Further, as shown in Japanese Patent Application Laid-Open No. 2-179927, a structure in which tilt correction is performed by tilting the entire optical head is disclosed in Japanese Patent Application Laid-Open Nos. 3-27229 / 1990 and 2-0 / 1990.
As disclosed in Japanese Unexamined Patent Application Publication No. 94115 and Japanese Unexamined Patent Application Publication No. 62-062439, there is a structure in which tilt correction is performed by tilting the entire optical head and a guide member for guiding the optical head. Most of these conventional tilt correction methods use optical components inside the optical head to correct the warp and distortion of the optical disk from the inner circumference to the outer circumference of the optical disk, and the tilt generated by the accuracy of the device. Alternatively, the entire optical head or the entire optical head and the guide member are operated over the entire tilt range.

[0005]

However, in each of the above-mentioned conventional examples, the entire range of the amount of tilt to be corrected for the warp of the optical disk is to be corrected each time. Since the head, the head carrier, and the entire optical components on the head carrier and the guide member are operated, not only the correction distance is increased and the operation is not quick, but also the correction operation is unstable due to the long correction distance. Inconvenience has always occurred.

Further, in each of the above-mentioned conventional examples, since the entire range of the tilt amount to be corrected for the warp of the optical disk is to be corrected each time as described above, the correction distance becomes longer. Therefore, there is an inconvenience that power consumption is increased because the drive control is repeated.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tilt correction method for an optical disk apparatus and an optical disk apparatus capable of quickly and stably correcting tilt of an optical head against warpage of an optical disk and reducing power consumption. That is its purpose.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, an optical disk as a recording medium, an optical head for writing or reading information to or from the optical disk, and an optical head for holding the optical head A head carrier section which is reciprocally movable along the radial direction of the optical disk described above, a linear guide section which holds the head carrier section and guides the reciprocating movement, and a head via the guide section. A guide tilt setting mechanism for arbitrarily setting the tilt of the carrier, a tilt sensor provided in the head carrier for detecting a tilt amount accompanying deformation of the optical disc, and a guide that operates based on information from the tilt sensor. Drive control of the tilt setting mechanism for setting the guide section at a predetermined angle to maintain the optical axis of the optical head in an optimum state as described above. And a belt correction main control unit.

Then, the tilt sensor and the tilt correction main controller are operated to measure in advance the tilt change in the radial direction caused by the deformation of the optical disk, and thereafter, the average value of the measured tilt changes in the radial direction is calculated. Operation, then
The inclination corresponding to the calculated average tilt amount is set in the guide section via the above-described guide section inclination setting mechanism.
Thus, the optical axis of the optical head is set substantially perpendicular to the recording surface of the optical disk.

For this reason, in the invention according to claim 1,
First, prior to the actual information recording or reproducing operation, the head carrier unit 3 is moved along the guide unit 4 in order to measure the tilt amount of the optical disk surface. During this movement, the relative tilt amount between the optical disk and the optical head is detected by the tilt sensor, and the inclination angle of the guide portion based on the average value of the detected tilt amounts is set and maintained. Therefore, according to the first aspect of the present invention, the tilt correction operation can be performed by one reciprocating operation (or one-way operation) of the head carrier unit, and the tilt correction operation is performed during the actual writing / reading operation. In this case, the operation of the guide section inclination setting mechanism is stopped and controlled. For this reason, the stabilization of the tilt correction and the reduction of the power consumption are reliably performed.

According to the second aspect of the present invention, an optical disk as a recording medium, an optical head for writing / reading information to / from the optical disk, and the optical head holding the optical head and freely reciprocating in the radial direction of the optical disk. A head carrier part, a linear guide part for holding the head carrier part and guiding the reciprocating movement thereof, and a guide part inclination for arbitrarily setting the inclination of the head carrier part via the guide part. A setting mechanism, a tilt sensor mounted on the head carrier section for detecting a tilt amount accompanying deformation of the optical disc, and operating based on information from the tilt sensor to drive and control the guide section tilt setting mechanism to determine the guide section. A tilt correction main controller for setting the optical axis of the optical head at an angle and maintaining the optical axis of the optical head in an optimum state.

The tilt sensor and the tilt correction main controller are operated to measure the tilt change in the radial direction caused by the deformation of the optical disk in advance, and the average value of the measured tilt change in the radial direction is measured. Then, using the calculated average tilt amount as a reference value, a difference between the reference value and the actual tilt amount output from the tilt sensor described above is calculated to calculate a reference difference tilt amount,
Based on the reference difference tilt amount, the above-described guide section is set to a predetermined inclination angle by following the tilt change of the optical disk. Thus, a configuration is adopted in which the optical axis of the optical head is set substantially perpendicular to the recording surface of the optical disk.

Therefore, according to the second aspect of the present invention,
As in the first aspect of the present invention, first, prior to the actual recording or reproducing operation of information, the head carrier is moved along the optical disc so that the relative position between the disc surface of the optical disc and the optical head is changed. The amount of tilt is detected, and the average amount of tilt is calculated. Then, the above-described guide portion is set and maintained at a large inclination angle corresponding to the calculated average tilt amount.

Thereafter, when the optical head performs a recording operation or a reproducing operation, an increase or a decrease in the tilt amount is calculated with the movement of the tilt sensor based on the average tilt amount.
Tilt correction is performed according to the calculated amount (reference difference tilt amount).

Therefore, according to the second aspect of the present invention, the operating range of the guide portion tilt setting mechanism is halved compared to the conventional example, and the neutral point of the structure of the guide portion tilt setting mechanism is reduced. Since the operation is performed in a narrow range centered on the tilt, the tilt correction can be speeded up, stabilized, and the correction accuracy can be improved, and the power consumption can be further reduced.

According to the third aspect of the present invention, an optical disk as a recording medium, an optical head for writing or reading information to or from the optical disk, and a device for holding the optical head and reciprocating along the radial direction of the optical disk. Head carrier portion, a linear guide portion for holding the head carrier portion and guiding the reciprocation thereof, and a guide portion inclination setting mechanism for arbitrarily setting the inclination of the head carrier portion via the guide portion. A tilt sensor mounted on the head carrier unit for detecting the amount of tilt associated with the deformation of the optical disk, and a guide unit which operates based on information from the tilt sensor and drives and controls the above-described guide unit tilt setting mechanism. And a tilt correction main controller for maintaining the optical axis of the optical head in an optimum state by setting the angle at a predetermined angle. .

An average tilt amount for calculating an average value of the measured values together with drive control so as to measure a tilt change in a radial direction caused by the deformation of the optical disk via a tilt sensor. A calculation function and a guide part inclination setting function that operates based on the calculated average tilt amount and sets and holds the guide part at a predetermined inclination angle via the guide part inclination setting mechanism described above, The configuration is adopted.

Therefore, in the invention according to claim 3,
As in the first aspect of the present invention, prior to the actual information recording or reproducing operation, first, the tilt amount of the disk surface of the optical disk is measured, and the average tilt amount is calculated. In this case, the head carrier section is moved along the radial direction of the optical disc, for example, in the information area S where information recording is permitted.
_A (or information zone S only in the area where information is recorded)
_Z ) is moved from the innermost circumference to the outermost circumference.

During this movement, a relative tilt amount between the optical disk and the optical head is detected by the tilt sensor, and an average value of the detected tilt amounts (both reciprocating and in one direction) is calculated. It is calculated in the section and stored in the memory. At the same time, the guide drive control circuit is operated based on the calculated average tilt amount, and the guide portion tilt setting mechanism is operated to set and maintain the tilt angle corresponding to the average tilt amount in the guide portion described above. You.

Therefore, in the third aspect of the present invention, similarly to the first aspect of the present invention, the tilt correction operation is performed by a single reciprocating operation (or an operation in one direction) of the head carrier unit. ), And during the actual writing / reading operation, the operation of the guide portion tilt setting mechanism is stopped and controlled. For this reason, the stabilization of the tilt correction and the reduction of the power consumption are reliably performed.

According to the present invention, the tilt correction main controller calculates the average tilt amount of the optical disk based on the information from the tilt sensor, and uses the average tilt amount as a reference value. A tilt amount calculation unit that calculates a difference between the actual tilt amount output from the sensor and a reference difference tilt amount, and a memory that stores an average tilt amount calculated by the tilt amount calculation unit as a reference value,
A guide section drive control circuit that drives and controls the above-described guide section tilt setting mechanism based on the reference value stored in the memory is adopted.

Therefore, the invention according to claim 4 has a function equivalent to that of the invention described in claim 3, and enables quick, stable and low power consumption of tilt correction. Becomes

According to the fifth aspect of the present invention, an optical disk as a recording medium, an optical head for writing or reading information to or from the optical disk, and a device for holding the optical head and reciprocating along the radial direction of the optical disk. Head carrier portion, a linear guide portion for holding the head carrier portion and guiding the reciprocation thereof, and a guide portion inclination setting mechanism for arbitrarily setting the inclination of the head carrier portion via the guide portion. A tilt sensor mounted on the head carrier for detecting the amount of tilt associated with the deformation of the optical disc; and operating based on information from the tilt sensor to drive and control the above-described guide section inclination setting mechanism to determine the guide section. A tilt correction main controller for setting the optical axis of the optical head at an angle and maintaining the optical axis of the optical head in an optimum state.

The tilt correction main control unit measures the tilt change in the radial direction caused by the deformation of the optical disk through the tilt sensor and calculates an average tilt amount, and a function of calculating the average tilt amount. A reference difference tilt amount calculation function for calculating a difference between the reference value and the actual tilt amount output from the above-described tilt sensor by using the calculated average tilt amount as a reference value, thereby calculating a reference difference tilt amount. A guide portion tilt setting function that operates based on the reference difference tilt amount and the reference value, and controls the guide portion to be set to a predetermined tilt angle via the guide portion tilt setting mechanism. The optical axis of the optical head is set to a substantially vertical state following the change in the amount of tilt of the recording surface.

Therefore, according to the invention of claim 5,
Similarly to the above-described invention, first, prior to the actual recording or reproducing operation of information, the tilt amount of the disk surface of the optical disk is measured and the average tilt amount is calculated. In this case, the head carrier section is moved along the radial direction of the optical disc, for example, in the information area S where information recording is permitted.
_A (or information zone S only in the area where information is recorded)
_Z ) is moved from the innermost circumference to the outermost circumference.

During this movement, the relative tilt amount between the optical disk and the optical head is detected by the tilt sensor, and the average value of the detected tilt amounts (reciprocating or only one direction) is calculated. It is calculated in the section and stored in the memory. At the same time, the guide drive control circuit is operated based on the calculated average tilt amount, and the guide portion tilt setting mechanism is operated to set and maintain the tilt angle corresponding to the average tilt amount in the guide portion described above. You. And
Thereafter, in the recording or reproducing operation of the optical head, an increase or decrease of the tilt amount is calculated together with the movement of the tilt sensor based on the average tilt amount, and the tilt correction is performed according to the calculated amount (reference difference tilt amount). Will be

Therefore, according to the fifth aspect of the present invention, similarly to the second aspect of the present invention, the operating range of the guide portion tilt setting mechanism is reduced by half, and Since the operation is performed in a narrow range around the neutral point of the structure, the tilt correction can be speeded up, stabilized, and power consumption can be reduced.

According to a sixth aspect of the present invention, in the optical disk device of the fifth aspect, the tilt correction main controller calculates an average tilt amount of the optical disk based on information from the tilt sensor, and calculates the average tilt amount of the optical disk. A tilt amount calculation unit that calculates a difference between the actual tilt amount output from the tilt sensor and calculates a reference difference tilt amount using the tilt amount as a reference value, and an average tilt amount calculated by the tilt amount calculation unit. A memory for storing a reference value, and a guide drive control for driving and controlling the guide tilt setting mechanism based on the reference value stored in the memory and the reference difference tilt amount calculated by the tilt correction main control unit. It employs a technique of configuring with a circuit.

Therefore, the invention according to claim 6 has the same function as that of the invention described in claim 5 and can speed up, stabilize, and reduce power consumption of tilt correction. Becomes

According to a seventh aspect of the present invention, in the third, fourth, fifth, or sixth aspect of the invention, the head carrier holds the optical head in a state of facing the optical disk, and the optical head has a radius. A tilt minute correction mechanism is provided for setting the optical axis of the optical head to an optimum state by inclining the optical head at an arbitrary angle along the direction. The tilt correction main control unit operates based on the reference difference tilt amount, which is the difference between the average tilt amount and the actual tilt amount output from the tilt sensor, and drives the above-described minute tilt correction mechanism. A configuration is provided in which a tracking correction control function is provided.

Therefore, in the invention according to claim 7,
In addition to functioning equivalently to the above-mentioned invention, the guide portion is tilted by operating the tilt minute correction mechanism or the tilt minute correction mechanism and the guide tilt setting mechanism. Therefore, the actual tilt correction can be performed more quickly and with high accuracy.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

The first embodiment shown in FIG. 1 includes an optical disk 1 as a recording medium, an optical head 2 for writing or reading information on or from the optical disk 1,
A head carrier section 3 which holds the optical head 2 and is reciprocally movable along the radial direction of the optical disc 1; and a linear guide section 4 which holds the head carrier section 3 and guides the reciprocating movement. And a guide section inclination setting mechanism 5 for arbitrarily setting the inclination of the head carrier section 3 via the guide section 4. Symbol 6 is
2 shows a spindle motor that drives the optical disc 1 to rotate.

For this reason, the head carrier 3 moves along the radial direction of the disk surface of the optical disk 1 while being controlled by the control unit (not shown) and guided by the guide unit 4, and during this time, the optical head 2 moves the head carrier 3 in a predetermined Is recorded or reproduced.

The head carrier unit 3 includes a tilt sensor 11 for detecting a tilt amount accompanying deformation of the optical disk 1 (various cases such as natural deformation with time and deformation due to local heating caused by a change in surrounding environment). Is equipped. Further, in the first embodiment, as shown in FIG. 1, the guide section 4 is operated based on information from the tilt sensor 11 to drive and control the above-described guide section inclination setting mechanism 5 so that the guide section 4 is driven. A tilt correction main control unit 12 that is set at a predetermined angle and maintains the optical axis of the optical head 2 in an optimal state is provided.

Here, the tilt correction main controller 12 measures the tilt change in the radial direction caused by the deformation of the optical disc 1 via the tilt sensor 11 and calculates the average tilt amount for calculating the average value. It has a calculation function. The tilt correction main control unit 12 calculates a difference between the reference value and the actual tilt amount output from the tilt sensor 11 by using the calculated average tilt amount as a reference value to calculate a reference difference tilt amount. And a guide which operates on the basis of the calculated reference difference tilt amount and the reference value to set and control the guide portion 4 to a predetermined tilt angle via the guide portion tilt setting mechanism 5 described above. And a section inclination setting function.

More specifically, the tilt correction main controller 12 calculates the average tilt amount of the optical disc 1 based on the information from the tilt sensor 11 and uses the average tilt amount as a reference. A tilt amount calculation unit 13 is provided for calculating a difference from the actual tilt amount output from the tilt sensor 11 as a value and calculating a reference difference tilt amount.

The tilt correction main control unit 12
A memory 14 for storing the average tilt amount calculated by the tilt amount calculation unit 13 as a reference value, and a memory for storing the reference value stored in the memory 14 and the reference difference tilt amount calculated by the tilt amount calculation unit 13 described above. Drive control circuit 1 for controlling the drive of the guide inclination setting mechanism 5 described above
5.

Next, the basic operation of the above embodiment will be described. In the operation of following the tilt change on the surface of the optical disc 1, first, the tilt sensor 11 and the tilt correction main control unit 12 are operated, and the tilt change in the radial direction caused in advance by the deformation of the optical disc 1 is transmitted to a plurality of locations. The average value of the measured tilt change in the radial direction is calculated and stored in the memory 14.

Next, using the calculated average tilt amount as a reference value, a difference between the reference value and the actual tilt amount output from the above-described tilt sensor 11 is calculated to calculate a reference difference tilt amount. Guide unit 4 based on reference difference tilt amount
Is set to a predetermined tilt angle in real time following the tilt change of the board surface of the optical disc 1. The arrow A in FIG. 1 indicates the inclination direction of the guide portion 4 in this case.

More specifically, when the optical disk apparatus is set to the operating state, first, before the actual information recording or reproducing operation, the amount of tilt of the surface of the optical disk 1 is measured and the average amount of tilt is calculated. Done. In this case, the head carrier unit 3 is moved along the radial direction of the optical disc 1
It is moved from the innermost circumference to the outermost circumference of the information area S _A where information recording is permitted (or the information zone S _Z only in the area where information is recorded).

During this movement, the tilt sensor 11
As a result, the relative tilt amount between the optical disk 1 and the optical head 2 is detected at a plurality of locations, and the average value of the detected tilt amounts is calculated by the tilt amount calculation unit 13 and stored in the memory 14 as described above. . At the same time, the guide drive control circuit 15 is operated based on the calculated average tilt amount, and the guide tilt setting mechanism 5 is operated to set the above-described guide portion 4 with the tilt angle corresponding to the average tilt amount. Will be maintained.

As described above, before the recording or reproducing operation of the optical disk apparatus is started, in particular, the warpage which is a relatively large deformation out of the warp of the optical disk in the radial direction of the optical disk and the deformation due to the local distortion is previously determined. Perform tilt correction.

Thereafter, along with the recording or reproducing operation of the optical head 2, an increase or a decrease in the tilt amount is calculated with the movement of the tilt sensor 11 based on the average tilt amount, and according to the calculated amount (reference difference tilt amount). Tilt correction is performed.

For this reason, for example, as shown in FIG. 3, the tilt amount due to the warp of the optical disk 1 changes in a gradual quadratic curve in most cases as shown in FIG. When viewed from the outside, the maximum is A on the outer peripheral side as shown in FIG. 3, but the correction amount is A / 2 (= B) at the maximum. Here, the maximum correction amount is A in the conventional example. Therefore, in the first embodiment, the operation range of the guide section inclination setting mechanism 5 is reduced by half, and the operation of the guide section inclination setting mechanism 5 is performed in a narrow range around the neutral point. Therefore, it is possible to stabilize tilt correction and reduce power consumption.

[0046] Furthermore, the tilt correction for warping of the optical disc before the entire apparatus operating, when only the information within the zone S _Z which information of the optical disc is recorded, it is possible to efficiently tilt correction. In this case, the optical disc 1 may be rotated by the spindle motor 6 or may be in a non-rotating state.

As a result, it is possible to write or read information on or from the optical disc 1 in a stable and highly accurate manner while quickly correcting the tilt caused by the warpage of the optical disc 1.

Here, in the first embodiment,
The case where the tilt correction in the radial direction of the optical disc 1 is performed in real time based on the reference difference tilt amount has been described. However, the present invention is not necessarily limited to this, and the tilt correction is performed based on the inclination corresponding to the average tilt amount described above. The setting may be performed by setting and holding the guide unit 4. In this case, the above-described tilt correction main control unit 12 does not have the reference difference tilt amount calculation function, and the guide inclination setting function of the tilt correction main control unit 12 is performed through the guide inclination setting mechanism 5. Thus, the guide section 4 is set and controlled to have an inclination corresponding to the average tilt amount described above.

In this manner, prior to the actual information recording or reproducing operation, first, the head carrier section 3 is moved along the guide section 4 in order to measure the amount of tilt of the optical disk surface. During this movement, the relative tilt amount between the optical disk and the optical head is detected by the tilt sensor, and the inclination angle of the guide portion based on the average value of the detected tilt amounts is set and maintained.

Therefore, in such a case, the tilt correction operation can be performed by one reciprocating operation (or one-way operation) of the head carrier unit, and the tilt correction operation can be performed during the actual writing / reading operation. Is a guide section inclination setting mechanism 5
Is controlled to stop. For this reason, the stabilization of the tilt correction and the reduction of the power consumption are reliably performed.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIG. Here, the same reference numerals are used for the same components as those in the embodiment of FIG. 1 described above.

In FIG. 2, the head carrier section 3 includes:
The tilt minute correction mechanism 20 that holds the optical head 2 together with its optical system in a state facing the optical disk 1 and tilts the optical head 2 at an arbitrary angle in the radial direction to set the optical axis of the optical head 2 in an optimum state. Is equipped.

The tilt minute correction mechanism 20 operates an optical system such as an objective lens, a collimator lens, or a galvanometer mirror provided in the optical head 2 so that the optical axis 2A of the optical head 2 is moved to the recording / reproducing surface of the optical disk 2. Operates vertically.

The tilt correction main controller 12 described above is used.
Has a follow-up correction control function that operates based on the above-described reference value (average tilt amount) and the reference difference tilt amount to drive the tilt minute correction mechanism 20. Other configurations are the same as those of the first embodiment (FIG. 1).

Next, the operation of the second embodiment will be described.

When the optical head 2 follows the tilt change of the board surface of the optical disc 1, the tilt sensor 11 and the tilt correction main control unit 12 are first operated to advance the optical disc 2 in the same manner as in FIG. The tilt change in the radial direction caused by the deformation in the radial direction 1 is measured, and the average value of the measured tilt change in the radial direction is calculated.
4 is stored.

[0057] In this case, the optical head 2 in the information area S _A recording of information is permitted to move from the innermost circumference in the radial direction of the optical disc 2 up to the outermost circumference. While the optical head 2 is moving, the relative tilt amount between the optical head 2 and the optical disc 1 is detected at a plurality of positions by the tilt sensor 11, and the average value of the detected tilt amounts is calculated as described above. Calculated by the unit 13 and stored in the memory 14. Then, the guide unit 4 is tilted by operating the tilt minute correction mechanism 20 and the guide tilt setting mechanism 5 until the calculated average tilt amount reaches the calculated average tilt amount.

Thereafter, when the optical disk apparatus is continuously used, the optical disk 1 is detected by the tilt sensor 11.
The relative tilt between the optical head 2 and the optical head 2 is detected, and the tilt minute correction mechanism 20 is detected in the same manner as in the first embodiment.
And the guide inclination setting mechanism 5 are operated simultaneously or individually so that the optical axis 2A of the optical head 2 is perpendicular to the recording / reproducing surface of the optical disk 1 to correct the tilt. Thereby, local distortion of the optical disk 2 can be corrected.

In this manner, in addition to having the same operational effects as the first embodiment described above, the guide unit 4 is inclined by operating the tilt minute correction mechanism 20 and the guide inclination setting mechanism 5. Therefore, there is an advantage that the actual tilt correction can be performed more quickly and more accurately.

As described above, in the above-described conventional tilt correction method, the position of the tilt correction means (the guide section tilt setting mechanism 5) is adjusted by setting the tilt amount of the optical disk 2 to zero. As shown in the figure, the relative tilt amount between the optical head and the optical disk becomes maximum everywhere in the radial direction of the optical disk 2.
In the embodiment, since the relative tilt amount between the optical head 2 and the optical disk 1 is detected at a plurality of positions, and the guide unit 4 is inclined in a direction to correct the average value of the detected tilt amounts, the optical disk 2 Everywhere has a certain amount of tilt in advance.

Therefore, as shown in FIG. 3, the maximum tilt amount in the conventional tilt correction method is the tilt amount A, but the maximum tilt amount in each of the above embodiments is the tilt amount B.
Since B <A, the guide inclination setting mechanism 5 is operated near the neutral point of the correction stroke as compared with the conventional tilt correction method, and the tilt correction can be performed more quickly and more stably. It is possible to do it.

Further, in the tilt correcting means (inclination setting mechanism 5 for the guide portion), a coil is required to hold the optical components inside the optical head 2 or the entire optical head 2 at the initial adjustment position (neutral point). Although an elastic member such as a spring is used, when the optical components inside the optical head 2 or the entire optical head 2 are operated and moved from a neutral point, the holding force of the elastic member acts as a drag, and the drag is neutral. It gets bigger as you get away from the point.

In this regard, in the present embodiment, as described above, the distance away from the neutral point is shorter than that of the conventional tilt correction mechanism, and accordingly, the drag is reduced, and accordingly, the inclination of the guide portion is reduced. Since the force obtained by subtracting the drag from the driving force generated by the setting mechanism 5 is the driving force that can be actually used, the driving force that can be actually used becomes larger as the drag becomes smaller. Less power to be supplied and less power consumption.

In this case, in the second embodiment, the tilt correction main control unit 12 has an average tilt amount calculating function and a reference difference tilt amount calculating function, and further has a guide unit tilt setting function. An example has been described in which a tracking correction control function is provided, and the above-described guide section inclination setting mechanism 5 and tilt minute correction mechanism 20 are simultaneously driven based on the average tilt amount and the reference difference tilt amount. However, the present invention
The invention is not necessarily limited to this, and the guide inclination setting function may be configured to operate prior to the following correction control function.

The tilt correction corresponding to the reference difference tilt amount is all executed by the operation of the follow-up correction control function. On the other hand, the guide tilt setting function sets the tilt corresponding to the average tilt amount to the above-described guide tilt. The guide section 4 may be set and controlled in advance via the guide section inclination setting mechanism 5 so that the guide section 4 can be maintained, and the functions of both functions may be shared.

[0066]

The present invention is constructed and functions as described above, and according to this, the following effects can be obtained. According to the first aspect of the present invention, as described above, first,
Prior to the actual information recording or reproducing operation, the head carrier unit 3 is moved along the guide unit 4 in order to measure the tilt amount of the optical disk surface. During this movement, the relative tilt amount between the optical disk and the optical head is detected by the tilt sensor, and the inclination angle of the guide section based on the average value of the detected tilt amounts is set and maintained. For this reason, the tilt correction operation can be performed by one reciprocating operation (or operation in one direction) of the head carrier unit, and during the actual writing / reading operation, the operation of the guide unit inclination setting mechanism is performed. Is controlled to stop. For this reason, the stabilization of the tilt correction and the reduction of the power consumption are reliably performed.

According to the second aspect of the present invention, similarly to the first aspect of the present invention, first, an average tilt amount is calculated prior to an actual information recording or reproducing operation, and the calculated average tilt amount is calculated. The guide portion described above is set and maintained at a tilt angle of a magnitude corresponding to the above. Thereafter, during the recording operation or the reproducing operation of the optical head, the increase or decrease of the tilt amount is calculated together with the movement of the tilt sensor based on the average tilt amount, and the tilt correction is performed according to the calculated amount (reference difference tilt amount). Done. Therefore, according to the second aspect of the present invention, the operating range of the guide portion tilt setting mechanism is reduced by half as compared with the case of the conventional example, and the center of the structure of the guide portion tilt setting mechanism is centered on the neutral point. Since the operation is performed in a narrow range, the tilt correction can be speeded up and stabilized, the correction accuracy can be improved, and the power consumption can be further reduced.

According to the third aspect of the present invention, similarly to the first aspect of the present invention, before the actual information recording or reproducing operation, first, the tilt amount of the entire optical disc surface is detected by the tilt sensor. The average value of the detected tilt amount (reciprocation or only one direction) may be calculated by the tilt amount calculation unit and stored in the memory. At the same time, the guide drive control circuit is operated based on the calculated average tilt amount, and the guide portion tilt setting mechanism is operated to set and maintain the tilt angle corresponding to the average tilt amount in the guide portion described above. You.

Therefore, in the third aspect of the present invention, as in the first aspect of the present invention, the tilt correction operation is performed by a single reciprocating operation (or an operation in one direction) of the head carrier portion. ), And during the actual writing / reading operation, the operation of the guide portion tilt setting mechanism is stopped and controlled. For this reason, the stabilization of the tilt correction and the reduction of the power consumption are reliably performed.

The fourth aspect of the present invention has the same functions as those of the third aspect of the present invention, and can speed up, stabilize, and reduce power consumption of tilt correction.

According to the fifth aspect of the present invention, similarly to the second aspect of the present invention, first, before the actual information recording or reproducing operation, the tilt amount of the disk surface of the optical disk is measured by the tilt sensor. The average value (which may be round trip or one direction only) is calculated by the tilt amount calculation unit and stored in the memory. At the same time, the guide drive control circuit is operated based on the calculated average tilt amount, and the guide portion tilt setting mechanism is operated to set and maintain the tilt angle corresponding to the average tilt amount in the guide portion described above. You. After that,
In the recording or reproducing operation of the optical head, an increase or a decrease in the tilt amount is calculated together with the movement of the tilt sensor based on the average tilt amount, and the tilt correction is performed according to the calculated amount (reference difference tilt amount).

Therefore, in the fifth aspect of the present invention, similar to the second aspect of the present invention, the tilt correcting operation is performed near the neutral point within the range of the adjustment stroke of the guide inclination setting mechanism. Is performed, the operating range of the guide portion tilt setting mechanism is halved, and therefore, the tilt correction operation can be performed quickly and stably. Since the adjustment stroke range is small, power consumption during driving is also reduced. If the tilt correction for the optical disk warpage before the operation of the entire apparatus is performed only in the information zone where the information on the optical disk is recorded, the tilt correction can be further speeded up, stabilized, and reduced in power consumption. Power can be used.

According to the sixth aspect of the present invention, the same functions as those of the fifth aspect of the present invention are provided, and the tilt correction can be speeded up, stabilized, and reduced in power consumption.

The invention according to claim 7 functions in the same manner as the invention described in claim 3, 4 or 5, and furthermore,
Since the fine tilt correcting mechanism or the fine tilt correcting mechanism and the tilt setting mechanism for the guide portion are operated to tilt the guide portion, the actual tilt correction can be performed more quickly and with high accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a difference between the operation of the embodiment shown in FIGS. 1 and 2 and the operation of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical head 3 Carrier head part 4 Guide part 5 Guide part inclination setting mechanism 11 Tilt sensor 12 Tilt correction main control part 13 Tilt amount calculating part 14 Memory 15 Guide part drive control circuit 20 Tilt minute correction mechanism

Claims (7)

[Claims] 1. An optical disk as a recording medium, an optical head for writing or reading information to or from the optical disk, and a head carrier unit holding the optical head and being reciprocally movable in a radial direction of the optical disk. A linear guide portion for holding the head carrier portion and guiding the reciprocating movement thereof; a guide portion inclination setting mechanism for arbitrarily setting the inclination of the head carrier portion via the guide portion; A tilt sensor that is mounted on the carrier unit and detects a tilt amount accompanying deformation of the optical disc; and operates based on information from the tilt sensor to drive and control the guide section tilt setting mechanism to set the guide section to a predetermined angle. An optical disc apparatus comprising: a main controller for tilt correction for setting and maintaining an optical axis of the optical head in an optimum state. Activating the tilt sensor and the tilt correction main controller to measure in advance the radial tilt change caused by the deformation of the optical disc, and then calculate the average value of the measured radial tilt change. Next, an inclination corresponding to the calculated average tilt amount is set in the guide section via the guide section inclination setting mechanism, whereby the optical axis of the optical head is set with respect to the recording surface of the optical disc. A tilt correction method for an optical disk device, wherein the tilt is set to a substantially vertical state. 2. An optical disk as a recording medium, an optical head for writing / reading information to / from the optical disk, and a head carrier unit holding the optical head and being reciprocally movable in a radial direction of the optical disk. A linear guide portion for holding the head carrier portion and guiding the reciprocating movement thereof; a guide portion inclination setting mechanism for arbitrarily setting the inclination of the head carrier portion via the guide portion; A tilt sensor that is mounted on the carrier unit and detects a tilt amount accompanying deformation of the optical disc; and operates based on information from the tilt sensor to drive and control the guide section tilt setting mechanism to set the guide section to a predetermined angle. An optical disc apparatus comprising: a main controller for tilt correction for setting and maintaining an optical axis of the optical head in an optimum state. Operating the tilt sensor and the tilt correction main controller to measure in advance the radial tilt change caused by the deformation of the optical disc, and calculate an average value of the measured radial tilt change; Next, using the calculated average tilt amount as a reference value, a difference between the reference value and the actual tilt amount output from the tilt sensor is calculated to calculate a reference difference tilt amount, and based on the reference difference tilt amount, Setting the guide portion to a predetermined inclination angle following the tilt change of the optical disc, thereby setting the optical axis of the optical head to be substantially perpendicular to the recording surface of the optical disc. Tilt correction method for an optical disk device. 3. An optical disk as a recording medium, an optical head for writing / reading information to / from the optical disk, and a head carrier unit holding the optical head and being reciprocally movable in a radial direction of the optical disk. A linear guide portion for holding the head carrier portion and guiding the reciprocating movement thereof; a guide portion inclination setting mechanism for arbitrarily setting the inclination of the head carrier portion via the guide portion; A tilt sensor that is mounted on the carrier unit and detects a tilt amount accompanying deformation of the optical disc; and operates based on information from the tilt sensor to drive and control the guide section tilt setting mechanism to set the guide section to a predetermined angle. An optical disc apparatus comprising: a main controller for tilt correction for setting and maintaining an optical axis of the optical head in an optimum state. The tilt correction main control unit measures, via the tilt sensor, a tilt change in the radial direction caused by deformation of the optical disc, and calculates an average value of the average tilt amount; and A guide section inclination setting function that operates based on the average tilt amount and controls the guide section to be set to a predetermined inclination angle via the guide section inclination setting mechanism, whereby the recording surface of the optical disc is An optical disk device, wherein an optical axis of the optical head is set to be substantially vertical. 4. The tilt correction main control unit calculates an average tilt amount of the optical disk based on information from the tilt sensor, and calculates an actual tilt output from the tilt sensor using the average tilt amount as a reference value. A tilt amount calculation unit that calculates a difference from the tilt amount and calculates a reference difference tilt amount;
A memory that stores the average tilt amount calculated by the tilt amount calculation unit as a reference value, and a guide unit drive control circuit that drives and controls the guide inclination setting mechanism based on the reference value stored in the memory. The optical disk device according to claim 3, wherein the optical disk device is configured. 5. An optical disk as a recording medium, an optical head for writing / reading information to / from the optical disk, and a head carrier unit holding the optical head and being reciprocally movable in a radial direction of the optical disk. A linear guide portion for holding the head carrier portion and guiding the reciprocating movement thereof; a guide portion inclination setting mechanism for arbitrarily setting the inclination of the head carrier portion via the guide portion; A tilt sensor that is mounted on the carrier unit and detects a tilt amount accompanying deformation of the optical disc; and operates based on information from the tilt sensor to drive and control the guide section tilt setting mechanism to set the guide section to a predetermined angle. An optical disc apparatus comprising: a main controller for tilt correction for setting and maintaining an optical axis of the optical head in an optimum state. The tilt correction main control unit measures, via the tilt sensor, a tilt change in the radial direction caused by deformation of the optical disc, and calculates an average value of the average tilt amount; and A reference difference tilt amount calculation function for calculating a difference between the reference value and the actual tilt amount output from the tilt sensor using the average tilt amount as a reference value to calculate a reference difference tilt amount, and a calculated reference difference tilt A guide section inclination setting function that operates based on the amount and the reference value and controls the guide section to be set at a predetermined inclination angle via the guide section inclination setting mechanism, and the tilt amount of the recording surface of the optical disc is changed. An optical disk device, wherein the optical axis of the optical head is set to be substantially perpendicular to the optical head. 6. The tilt correction main controller calculates an average tilt amount of the optical disk based on information from the tilt sensor, and uses the average tilt amount as a reference value to output an actual tilt output from the tilt sensor. A tilt amount calculation unit that calculates a difference from the tilt amount and calculates a reference difference tilt amount;
A memory for storing the average tilt amount calculated by the tilt amount calculation unit as a reference value, and a memory for storing the guide value based on the reference value stored in the memory and the reference difference tilt amount calculated by the tilt amount calculation unit. 6. The optical disk device according to claim 5, wherein said optical disk device comprises a guide drive control circuit for driving and controlling said inclination setting mechanism. 7. An optical axis of the optical head is optimized by holding the optical head in the head carrier portion so as to face the optical disk and tilting the optical head at an arbitrary angle in a radial direction. A tilt minute correction mechanism for setting a state is provided, and the tilt correction main control unit operates based on a reference difference tilt amount that is a difference between the average tilt amount and an actual tilt amount output from the tilt sensor. 7. The optical disk device according to claim 3, further comprising a tracking correction control function for driving said tilt minute correction mechanism.