JP2842403B2 - Tilt correction method for optical disk device and optical disk device - Google Patents

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]

[Means for Solving the Problems]

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 a radius of the optical disk holding the optical head and being described above. A head carrier part that is reciprocally movable along a direction, a linear guide part that holds the head carrier part and guides the reciprocating movement, and allows the inclination of the head carrier part to be arbitrarily set via the guide part. A tilt setting mechanism for the guide section, a tilt sensor mounted on the head carrier section for detecting a tilt amount accompanying deformation of the optical disk, and operates based on information from the tilt sensor to drive the tilt setting mechanism for the guide section. A tilt correction main control that controls the guide section to a predetermined angle and maintains the optical axis of the optical head in the optimal state described above. And a part.

The tilt sensor and the tilt correction main control unit are operated to measure the tilt change in the radial direction caused by the deformation of the optical disk in advance, and to calculate the average value of the measured tilt change in the radial direction. 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.

[0011] Therefore, in the invention according to claim 1 ,
Also not a, prior to the actual recording or reproducing operation of the information, the head carrier unit is moved along the optical disc and detecting a relative tilt amount between the disk surface and the optical head of the optical disk, 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 first 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 a second 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 the optical head holding the optical head and being reciprocally movable in a 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. .

The tilt correction main control unit controls the drive so as to measure a tilt change in the radial direction caused by the deformation of the optical disk via the tilt sensor, and calculates an average tilt of the measured values. configuration in which the amount calculated function, and a guide portion inclined setting function of holding set the guide portion through the calculation has been averaged operated on the basis of the amount of tilt aforementioned guide portion for tilt setting mechanism to a predetermined angle of inclination And And furthermore, this tilt correction main control
Part of the optical disk based on the information from the tilt sensor.
Calculate the average tilt amount and use this average tilt amount as a basis.
The actual value output from the tilt sensor
Calculates the difference from the tilt amount and calculates the reference difference tilt amount
And the average tilt calculated by the tilt amount calculation section.
Memory that stores the default value as the reference value, and
Based on the stored reference value, the above-mentioned guide
And a guide drive control circuit that drives and controls the
Is adopted.

Therefore, according to the second aspect of the present invention ,
Prior to recording or reproducing operation of the information the actual, firstly, to measure the amount of tilt surface of the optical disk is the calculation of an average tilt value is performed. In this case, the head carrier portion is moved along the radial direction of the optical disc, for example, from the innermost circumference of the information area S _A where information recording is permitted (or the information zone S _Z only in a range where information is recorded). Move 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 (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.

[0018] Therefore, in the invention of claim 2, wherein, the operation of the Tilt correction becomes possible in a single reciprocating movement of the head carrier unit (or operation in one direction), the actual writing / reading During the operation, the operation of the guide portion tilt setting mechanism is stopped and controlled. Therefore, it is possible to speed up, stabilize, and reduce power consumption of the tilt correction.

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 the optical head holding the optical head and being reciprocally movable along a 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 disc through the tilt sensor and calculates an average tilt amount, and an average tilt amount calculating function. 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 third aspect of the present invention,
Like the invention of claim 1, wherein the aforementioned, first, prior to the actual recording or reproducing operation of information, by measuring the amount of tilt surface of the optical disk is the calculation of an average tilt value is performed. 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 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. 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, in the third aspect of the present invention, similarly to the first aspect of the present invention, the operating range of the guide section inclination 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 the fourth aspect of the present invention, the above-mentioned claim is provided.
3. In the optical disc device described in 3 , the tilt correction main controller calculates an average tilt amount of the optical disc based on information from the tilt sensor, and uses the average tilt amount as a reference value to output the actual tilt output from the tilt sensor. A tilt amount calculator for calculating a difference between the tilt amount and the reference amount, calculating a reference difference tilt amount, a memory storing the average tilt amount calculated by the tilt amount calculator as a reference value, and a reference stored in the memory. And a guide section drive control circuit that drives and controls the guide section tilt setting mechanism based on the value and the reference difference tilt amount calculated by the tilt correction main control section described above.

For this reason, the invention according to claim 4 has the same function as the invention described in claim 3 , and can speed up, stabilize, and reduce power consumption of tilt correction. Becomes

[0026] In the invention of claim 5 is Oite the optical disk apparatus according to claim 2, 3 or 4, wherein the aforementioned, the head carrier unit holds while facing the optical head on the optical disc, the optical head A tilt minute correction mechanism for tilting the optical head at an arbitrary angle in the radial direction to set the optical axis of the optical head in an optimum state is provided. 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 5 ,
Besides functioning equivalent to the invention of claim 2, 3 or 4, wherein the aforementioned, further, was set to tilt the micro correction mechanism, or by operating the tilt fine correction mechanism and the guide portion for tilt setting mechanism tilts the guide portion Therefore, the actual tilt correction can be performed more quickly and with high accuracy.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described below 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 surface of the optical disk 1 under the control of the control unit (not shown) and is guided by the guide unit 4, and during this time, the optical head 2 moves the head carrier 3 in a predetermined direction with respect to the optical disk 1. Is recorded or reproduced.

The head carrier unit 3 includes a tilt sensor 11 for detecting a tilt amount accompanying deformation of the optical disc 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, a tilt correction main control unit 12 which operates based on information from the tilt sensor 11 is provided.
The tilt correction main control section 12 drives and controls the above-described guide section inclination setting mechanism 5 to set the guide section 4 at a predetermined angle and maintain the optical axis of the optical head 2 in an optimum state.
Has functions.

Here, the tilt correction main controller 12 measures the tilt change in the radial direction caused by the deformation of the optical disk 1 through 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 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, the warpage of the optical disk in the radial direction of the optical disk and the deformation due to the local distortion, in particular, the warpage that is a relatively large deformation, are determined in advance. Perform tilt correction.

Thereafter, the increase or decrease of the tilt amount is calculated with the movement of the tilt sensor 11 on the basis of the average tilt amount together with the recording or reproducing operation of the optical head 2, 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 amount of tilt due to the warp of the optical disk 1 often changes in a gentle quadratic curve as shown in FIG. when viewed, the maximum ing and a at 3 in the outer peripheral side, 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.

Further, 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.

[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 with the optical head 2 to move the optical axis 2A of the optical head 2 to the recording / reproducing surface of the optical disk 2. Operates vertically.

The tilt correction main control unit 12
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 disk surface of the optical disk 1, the tilt sensor 11 and the tilt correction main control unit 12 are first operated to advance the optical disk 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.

[0050] 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. That is, thereby, caused by local distortion of the optical disc 2
The tilt change can be corrected.

[0052] Even with this, in addition to having a first embodiment the same effects as described above, further, to tilt the guide portion 4 by operating the tilt fine correction mechanism 20 and the guide portion for tilt setting mechanism 5 Therefore, there is an advantage that the actual tilt correction can be performed more quickly and with high accuracy.

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.

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, since the distance away from the neutral point is shorter than that of the conventional tilt correction mechanism, the drag is correspondingly 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 section 12 has an average tilt amount calculating function and a reference difference tilt amount calculating function, and further has a guide section 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 portion inclination setting function sets the inclination corresponding to the average tilt amount to the guide portion described above. 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.

[0058]

The present invention is constructed and functions as described above, and according to this, the following effects can be obtained.

[0059] In the first aspect of the present invention, or not a, prior to the actual recording or reproducing operation of information, is calculated the average tilt amount, above the inclined angle of the magnitude corresponding to the average amount of tilt and the computed The set guide portion is set and maintained. 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 first 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 guide range tilt setting mechanism is narrowed around the neutral point of the structure. Since the operation is within the range, it is possible to speed up and stabilize the tilt correction, improve the correction accuracy, and further reduce the power consumption.

According to the second aspect of the present invention,
It has substantially the same function as the invention described in the first aspect , and enables quick, stable, and low power consumption of tilt correction.

According to the third aspect of the present invention,
Like the invention of the first aspect, first, prior to the actual recording or reproducing operation of the information, the amount of tilt surface of the optical disk is measured by the tilt sensor average value thereof (in a reciprocating, or in one direction only) is the amount of tilt It is calculated by the 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 third aspect of the present invention, similar to the first 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 fourth aspect of the present invention, the above-mentioned claim is provided.
It has functions equivalent to those of the invention described in the third aspect , and enables quick, stable and low power consumption of tilt correction.

According to the fifth aspect of the present invention, the above-mentioned claim is provided.
In addition to functioning equivalently to the invention described in 2, 3, or 4 ,
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 (5)

(57) [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. 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, the reference value and the tilt
The difference from the actual tilt amount output from the sensor is calculated and
The quasi-difference tilt amount is calculated, and based on the criterion difference tilt amount,
The guide section follows the tilt change of the optical disc
A tilt correction method for an optical disc device, wherein the tilt angle is set to a predetermined angle, whereby the optical axis of the optical head is set substantially perpendicular to the recording surface of the optical disc. 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 which holds the optical head and is 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 portion inclination setting function that operates based on the average tilt amount and sets and controls the guide portion to a predetermined inclination angle via the guide portion inclination setting mechanism, and the tilt correction main control. Part from the tilt sensor
When calculating the average tilt amount of the optical disk based on the information
In both cases, the average tilt amount is set as a reference
Calculate the difference from the actual tilt amount output from the
A tilt amount calculating section for calculating a tilt amount, and a tilt amount
The average tilt amount calculated by the calculation unit is stored as a reference value.
Based on the memory and the reference value stored in this memory
Guide section drive for driving and controlling the inclination setting mechanism for the guide section
An optical disc device comprising a control circuit, whereby the optical axis of the optical head is set substantially perpendicular to the recording surface of the optical disc. 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 a radial tilt change caused by deformation of the optical disc via the tilt sensor and calculates an average tilt amount, and an average tilt amount calculating function for calculating the average value. 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 to a predetermined inclination angle via the guide section inclination setting mechanism, wherein 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. 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 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. 4. The optical disk apparatus according to claim 3 , wherein said optical disk apparatus comprises a guide drive control circuit for driving and controlling said inclination setting mechanism. 5. 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. 5. The optical disk device according to claim 2 , further comprising a follow-up correction control function for driving said tilt minute correction mechanism.