JP2001126286A - Optical pickup and disk drive assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup and disk drive assembly which can correct the radial skew being the largest cause for the occurrence of an aberration while suppressing the unnecessary inclination of an objective lens in a tangential skew direction and can reduce the weight of a moving section mounted with the objective lens. SOLUTION: This optical pickup has an actuator base 21 which is disposed at the optical pickup 2, a bobbin 13 which is supported tiltably relative to the actuator base 21 and is mounted with the objective lens 12, a drive means which tilts the bobbin 13, optical sensors 27 and 28 which detect the inclination quantity of the recording surface with respect to the actuator base 21, optical sensors 25 and 26 which detect the inclination quantity of the bobbin 12 with respect to the actuator base 21 and a titling control means which tilts the moving section in such a manner that the angle of the optical axis of the objective lens 12 with respect to the recording surface is kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup and a disk drive provided with the optical pickup.

[0002]

2. Description of the Related Art Generally, in an optical disk system,
The optical design is such that when the laser beam emitted from the optical pickup is perpendicularly incident on the disk surface, aberration does not occur in the focused spot as much as possible. However, in an actual optical disk drive, an angle deviation (hereinafter, referred to as skew) between an incident beam and a disk surface occurs at the time of recording / reproducing a signal due to shaft runout during rotation of the turntable and warpage of the disk alone. The higher the density of signals recorded on a disc, the greater the influence of coma caused by this skew on signal reading and writing.
In order to increase the density of the optical disk, it is necessary to reduce the disk skew or optically correct the optical disk. For example, in a disk system such as a laser disk in which a disk diameter is large and disk skew frequently occurs, a mechanism as shown in FIG. 17 has been proposed. In the disk system shown in FIG. 17, when the disk skew θ occurs, the mechanical deck 1
The optical pickup 105 is set at an angle θ around a rotation axis 106 of the carriage 102 slidably mounted on the optical pickup 105.
By rotating the laser beam L only
In this method, the light is vertically incident on the surface of No. 3. However, according to this method, the optical pickup 105 must be tilted greatly, which consumes a large amount of power. Since it is not easy to tilt the optical pickup 105 at high speed, the AC component of the skew synchronized with the rotation of the disk 103 (the warpage of the disk 103 causes the rotation). It is difficult to correct the time variation that occurs every time.

[0003]

In order to solve the above-mentioned problems, the applicant of the present application has set an objective lens in an optical pickup constituting a recording / reproducing optical system so that the optical axis of the lens and the disk surface are always perpendicular to each other. An objective lens driving device for controlling the tilting so as to be as described in, for example, JP-A-10-64071.
In the publication. FIG. 18 and FIG.
FIG. 2 is a diagram illustrating a configuration of an objective lens driving device disclosed in the above publication. FIG. 18 is a side view of the objective lens driving device, and FIG. 19 is a plan view of the objective lens driving device shown in FIG. The objective lens driving device 201 shown in FIGS. 18 and 19 includes a suspension 208 fixed on a base 220, and a bobbin 205 as a movable portion held on the suspension 208. Objective lens 202 for forming a spot on the disk 210, a tangential skew sensor 203 for detecting the tilt of the objective lens 202 in the tangential skew direction TSD, and a radial skew sensor 204 for detecting the tilt in the radial skew direction RSD And a plurality of focus coils 206a to 206d
And a plurality of tracking coils 207a, 207b;
A plurality of magnets 209a and 209b are provided.
Note that the tangential skew direction TSD is a direction in which the optical axis of the objective lens 202 is inclined with respect to the tangential direction of the track direction TD of the disk 210, and the radial skew direction RSD is the direction of the optical axis of the objective lens 202 with respect to the radial direction of the disk 210. It is the direction of inclination. 18 and 19, the bobbin 205 has an objective lens 202, a skew sensor 203,
204, and only the coils 206 and 207 are mounted.
The power required for the skew control is smaller than that of the configuration shown in FIG. 17, and a high-speed operation can be performed to some extent, so that the AC component of the disk skew can be corrected.

However, in the objective lens driving device 201 shown in FIGS. 18 and 19, the tilt of the objective lens 202 in the radial skew direction RSD and the tangential skew direction TSD can be satisfactorily corrected. In order to detect skew in two directions in the tangential skew direction TSD, it is necessary to mount two skew sensors on the bobbin 205, and there is a disadvantage that the skew sensor is reflected in a rise in the price of the device. In addition, there is a disadvantage that an increase in the weight of the bobbin 205 hinders a higher bandwidth of the device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical pickup and a disk drive device capable of controlling the tilting of a movable portion on which an objective lens is mounted, and increasing the bandwidth of a servo system of the movable portion.

[0006]

According to the present invention, there is provided a disk drive device comprising: a rotary drive means for rotating a disk-shaped recording medium; and a rotating drive means provided movably with respect to a recording surface of the recording medium. A disk drive device having an optical pickup that performs at least one of recording and reproduction of optical data, comprising: a fixed portion provided on the optical pickup; and a support that is tiltable in a predetermined direction with respect to the fixed portion. And a movable portion equipped with an objective lens for focusing a light beam on the recording surface of the recording medium,
Driving means for tilting the movable portion, recording surface tilt amount detecting means for detecting the tilt amount of the recording surface in the predetermined direction with respect to the fixed portion, and movable portion for detecting the tilt amount of the movable portion with respect to the fixed portion The tilt amount detecting means, and the angle of the optical axis of the objective lens with respect to the recording surface is made constant based on the tilt amounts detected by the recording surface tilt amount detecting means and the movable portion tilt amount detecting means, respectively. Tilt control means for causing the driving means to tilt the movable portion.

Further, the disk drive device of the present invention is characterized in that a rotation drive means for rotating a disk-shaped recording medium and an optical drive between the recording medium provided movably with respect to the recording surface of the recording medium. A disk drive device having an optical pickup that performs at least one of data recording and reproduction, a fixed portion provided in the optical pickup, and supported to be tiltable in a predetermined direction with respect to the fixed portion, and A movable section on which an objective lens for focusing the light beam on the recording surface of the recording medium is mounted; a driving unit for tilting the movable section; and recording for detecting an amount of inclination of the recording surface with respect to the fixed section in the predetermined direction. The inclination of the optical axis of the objective lens with respect to the recording surface is determined based on the inclination amount detected by the surface inclination amount detection unit and the recording surface inclination amount detection unit. And a tilt control means for causing the drive means to be constant perform tilting of the movable portion.

An optical pickup according to the present invention comprises a light source for outputting a light beam, a fixed portion, and a movable portion mounted with an objective lens for converging the light beam and supported to be tiltable in a predetermined direction with respect to the fixed portion. A first optical sensor provided on the fixed part for detecting the amount of inclination of the movable part with respect to the fixed part in the predetermined direction; and a first optical sensor provided on the fixed part and arranged to face the objective lens. A second optical sensor for detecting an amount of inclination of the opposing surface of the object with respect to the fixed portion, and driving means for inclining the movable portion in the predetermined direction.

Further, the optical pickup of the present invention is provided with a light source for outputting a light beam, a fixed portion, and an objective lens for converging the light beam, and is movable and supported to be tiltable in a predetermined direction with respect to the fixed portion. Part, an optical sensor provided on the fixed part, for detecting the amount of inclination of the facing surface of the object placed opposite to the objective lens with respect to the fixed part, and moving the movable part in the predetermined direction. Drive means for tilting.

In the present invention, the inclination of the movable portion and the recording surface with respect to the fixed portion are detected by the movable portion inclination amount detecting means and the recording surface inclination amount detecting means, respectively. Therefore, without directly detecting the relative tilt amount between the movable portion and the recording surface, the tilt amount of the movable portion and the recording surface with respect to the fixed portion obtained by the movable portion tilt amount detecting means and the recording surface tilt amount detecting means. Thus, the relative tilt amount between the movable portion and the recording surface can be specified indirectly. Therefore, it is not necessary to provide a sensor for directly detecting the relative tilt amount between the movable portion and the recording surface in the movable portion.

In the present invention, the inclination of the recording surface with respect to the fixed portion is detected by the recording surface inclination amount detecting means, and the relative inclination of the movable portion with respect to the recording surface is determined by using the inclination of the recording surface with respect to the fixed portion. Perform tilt control. Therefore, it is not necessary to provide a sensor for directly detecting the relative tilt amount between the movable portion and the recording surface in the movable portion.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a configuration diagram showing one embodiment of a disk drive device of the present invention. Disk drive device 1 shown in FIG.
Is a drive unit 91 serving as a rotary drive unit for driving a disk D as a recording medium according to the present invention;
And The drive unit 91 includes a spindle motor 92,
A chucking portion 93 connected to the rotation shaft of the spindle motor 92; The chucking unit 93 can detachably chuck, for example, the center of the disk D, and the spindle motor 92 rotates the chucking unit 93 at a desired rotation speed.

The optical pickup 2 has a lens actuator 11 and a reproducing optical system 51. The lens actuator 11 has a function of driving the optical pickup 2 with respect to the disk D in the tracking direction TRK. Since the stroke is small, for example, the entire optical pickup 2 is positioned at an arbitrary position in the tracking direction TRK by a feed mechanism including a rack and pinion or a feed screw (not shown) and a motor or a feed mechanism having a linear motor. The tracking direction TRK is a direction in which the optical pickup 2 follows the track of the disk D (radial direction of the disk), and the focus direction FCS is a distance between the objective lens 12 of the optical pickup 2 and the recording surface of the disk D. (Direction perpendicular to the recording surface of the disk D).

The reproducing optical system 51 includes a light source 52 for emitting a laser beam L as a light beam, a collimator lens 53, a grating 54, a λ / 2 plate 55, a polarization beam splitter 56, and a λ / 2 plate 57. Condenser lens 58, cylindrical lens and concave lens 59, front monitor photodetector 60, photodetector 61, λ / 4
And a plate 62. The optical system that guides the laser light L from the light source 51 to the objective lens 12 is a collimator lens 5.
3, an optical system composed of a grating 54, a λ / 2 plate 55, a polarization beam splitter 56, and a λ / 4 plate 62, and guiding the reflected light from the disk D to a photodetector 61 as a light detecting means is a λ / 4 plate 62 A polarizing beam splitter 56, a λ / 2 plate 57, a condenser lens 58,
The reproducing optical system is constituted by a cylindrical lens and a concave lens 59, and is formed integrally with the lens actuator 11, for example.

For example, a laser diode can be used as the light source 52, and emits a laser beam L having a wavelength of, for example, 650 nm. The collimator lens 53 converts the laser light L emitted from the light source 52 into parallel light.
The parallel laser light L is applied to the grating 54.
Through the λ / 2 plate 55 and the polarization beam splitter 5
To 6. The polarization beam splitter 56 guides a part of the laser light L to the front monitor photodetector 60 and guides the remaining laser light L to the objective lens 12 side.
The front monitor photo detector 60 is a detector for monitoring the output of the laser light L emitted from the light source 52.

A part of the laser beam L guided from the polarization beam splitter 56 is incident on the objective lens 12 through the λ / 4 plate 62 and the opening H formed in the actuator base 21 of the lens actuator 11. The objective lens 12 focuses the laser light L on the recording surface of the disk D.

The laser beam L reflected by the disk D enters the polarization beam splitter 56 through the objective lens 12 and the λ / 4 plate 62, is reflected and passes through the λ / 2 plate 57, and is condensed by the condenser lens 58. And a cylindrical lens and a concave lens 5
The light is further condensed by 9 and enters the photodetector 61.

FIG. 4 is a diagram showing an example of the configuration of the photodetector 61. The photodetector 61 has rectangular detection areas 61A to 61H divided into eight. A tracking error signal TE, a focus error signal FE, and a radial skew error signal RSE, which will be described later, are detected based on the amounts of light detected in the detection areas 61A to 61H of the photodetector 61. The intensity of the reflected light due to the pits formed on the recording surface of the disk D is detected by the photodetector 61, and the data recorded as a pit pattern on the recording surface of the disk D is reproduced by signal processing.

The structure of the lens actuator FIGS. 2 and 3 is a diagram showing a specific configuration of the lens actuator 11, FIG. 2 is a plan view seen from the disk D side of the lens actuator 11, FIG. 3 Is a side view. The lens actuator 11 shown in FIGS. 2 and 3 includes an actuator base 21 and four elastic support members 31 fixed on the actuator base 21.
A bobbin 13 supported by each elastic support member 31; an objective lens 12 mounted on the bobbin 13; a plurality of magnets 14 fixed on the actuator base;
First to fourth focus coils 15a provided on
To 15d, and first and second tracking coils 16 provided on the bobbin 13 so as to face each magnet 14.
a, 16b and 4 provided on the actuator base
And two optical sensors 25, 26, 27 and 28.

The actuator base 21 corresponds to one specific example of the fixed part of the present invention, and the bobbin 13 corresponds to one specific example of the movable part of the present invention. The first to fourth focus coils 15a to 15d, the first and second tracking coils 16a and 16b, and the magnet 14 constitute driving means of the present invention. FIG.
3 and FIG. 3, the tangential skew direction T
SD is the direction in which the optical axis 12a of the objective lens 12 is inclined with respect to the tangential direction of the track TD of the disk D, and the radial skew direction RSD is the direction in which the optical axis 12a of the objective lens 12 is inclined with respect to the radial direction of the disk D. . Further, the above-described reproducing optical system is integrally fixed to the actuator base 21.

The actuator base 21 is, for example,
The actuator base 21 is formed of a non-magnetic material such as plastic or stainless steel. An opening H is formed in the center of the actuator base 21. The opening H receives laser light L incident on the objective lens 12 from the above-described reproducing optical system. The laser light L reflected by the disk D and traveling toward the reproduction optical system is transmitted. Further, the actuator base 21
As shown in FIG. 3, on both sides of the upper bobbin 13, stopper members 17 supported by fixing members 18 are provided. The stopper member 17 abuts on the bobbin 13 to regulate an excessive displacement of the bobbin 13 in the tracking direction TRK and the focus direction FCS toward the disk D.

On the bobbin 13, the objective lens 12 is mounted so that the optical axis 12a of the objective lens 12 passes through the center of gravity G of the bobbin 13. The bobbin 13 includes the objective lens 12
Are supported at four locations symmetrical with respect to the optical axis 12a by an elastic support member 31 formed by molding a thin plate having elasticity into a substantially cylindrical shape. As shown in FIG. 3, the height of the bobbin 13 supported by the elastic support member 31 from the actuator base 21 is substantially the same as the principal point M1 of the objective lens 12.

The elastic support member 31 is a member formed by molding a thin plate into a substantially cylindrical shape.
The movement in the CS and tracking directions TRK and the tilt in the radial skew direction RSD and the tangential skew direction TSD are elastically allowed. FIG.
FIG. 3 is a perspective view illustrating an example of a structure of an elastic support member 31. As shown in FIG. 5, the elastic support member 31 includes a thin plate member 31a.
Is bent into a substantially cylindrical shape, and the track direction TD
Are formed along the wall. This meat pressure part 3
1b plays a role of increasing the rigidity in the track direction while maintaining the flexibility of the thin plate member 31a of the elastic support member 31 in the longitudinal direction, whereby the bobbin 13 is stably supported. The four elastic support members 31 are elastically deformed independently of each other, so that the bobbin 13 moves in the focus direction FCS and the tracking direction TRK, and the radial skew direction RSD and the tangential skew direction T
Tilt to SD becomes possible.

First to fourth focus coils 15a to 15a
5d is disposed at a position symmetrical with respect to the center of gravity G of the bobbin 13, and the focus direction FC
The linear movement of S is performed. The magnets 14 are magnetized in the track direction, and the magnets 14 arranged in parallel have opposite polarities. The first and second tracking coils 16a and 16b are disposed at positions symmetrical with respect to the center of gravity G of the bobbin 13, and the bobbin 1 is moved by an electromagnetic force generated between the magnet 14 and the opposing magnet 14.
3 is performed in the tracking direction TRK.

The optical sensor 25 is fixed on the actuator base 21 so as to face the disk D.
This is a sensor for detecting the amount of inclination of the recording surface of the disk D with respect to the actuator base 21 in the tangential skew direction TSD. The optical sensor 26 is fixed on the actuator base 21 so as to face the disk D, and is a sensor for detecting a tilt amount (skew) of the recording surface of the disk D with respect to the actuator base 21 in the radial skew direction RSD. .

FIG. 6 is a diagram showing a configuration example of the optical sensors 25 and 26. As shown in FIG.
And 26 include, for example, a light emitting element 25a (26a) that outputs a laser beam having a wavelength of 950 nm, and first and second light receiving elements 2 including, for example, phototransistors.
5i, 25j (26i, 26j). FIG.
As shown in (b), the light emitting element 25a (26a) and the first
And the second light receiving elements 25i, 25j (26i, 26
j) is covered by the lens and the optical filter FT. The lens and the optical filter FT are, for example,
The light emitting element 25a is made of transparent plastic.
The laser light output from (26a) is condensed on the disk D, and passes through the laser light in the band near the wavelength of 950 nm and condensed on 25i, 25j (26i, 26j).

The optical sensor 25 is, as shown in FIG.
The light receiving elements 25i and 25j are arranged along the tangential skew direction TSD. The optical sensor 26 is
As shown in FIG. 2, the light receiving elements 25i and 25j are arranged along the radial skew direction RSD. Further, the optical sensors 25 and 26 have, for example, a diameter of 120 m.
m disk D is used, and disk D
The objective lens 12 and the optical sensor 2
The optical sensors 25 and 26 are offset toward the center of the disk D (on the side of the focus coils 15b and 15d) such that the optical sensors 5 and 26 are located on substantially the same track. That is, the optical sensors 25 and 26 can detect the inclination of the disk D in the radial skew direction RSD and the tangential skew direction TSD with respect to the actuator base 21 on the same track as the track on which the objective lens 12 is located.

The optical sensor 27 is fixed at a position facing the bobbin 13 on the actuator base 21.
This is a sensor for detecting the amount of inclination of the bobbin 13 in the tangential skew direction TSD with respect to the actuator base 21. The optical sensor 28 is fixed at a position facing the bobbin 13 on the actuator base 21, and is a sensor for detecting an amount of inclination (skew) of the bobbin 13 with respect to the actuator base 21 in the radial skew direction RSD. Also, the optical sensors 27 and 28
Is preferably provided as close as possible to the objective lens mounted on the bobbin 13 of the actuator base 21.

FIG. 7 is a diagram showing a configuration example of the optical sensors 27 and 28. As shown in FIG.
And 28 include, for example, a light-emitting element 27a (28a) that outputs a laser beam having a wavelength of 950 nm, and first and second light-receiving elements 2 including, for example, phototransistors.
7i, 27j (28i, 28j). On the other hand, FIG.
As shown in (b), the optical sensor 2 on the lower surface of the bobbin 13
A reflecting mirror 27b (28b) as a reflecting means of the present invention is provided at a position facing each of 7 and 28. Further, the light emitting element 27a (28a) and the first and second light receiving elements 27i, 27j (28i, 28j) are covered with a lens and an optical filter FT. The lens and the optical filter FT are formed of, for example, transparent plastic, and the light emitting elements 27a (28a)
Is condensed on the reflecting mirror 27b (28b), and passes through the laser light in a band around a wavelength of 950 nm, and is condensed on 27i, 27j (28i, 28j).

The optical sensor 27 is, as shown in FIG.
The light receiving elements 27i and 27j are arranged along the tangential skew direction TSD. The optical sensor 28
As shown in FIG. 2, the light receiving elements 28i and 28j are arranged along the radial skew direction RSD.

FIG. 8 is a diagram showing a configuration of a servo circuit for driving the lens actuator 11 of the disk drive device according to the present embodiment. The servo circuit shown in FIG. 6 constitutes the servo means and the tilt control means of the present invention. As shown in FIG. 8, in the disk drive device according to the present embodiment, the detection signal 61 of the photodetector 61 and the first and second light receiving elements 25i to 28i and 25j to 28j of the optical sensors 25 to 28 are connected. Signal processing circuit 301 and phase compensator 30 for tracking servo
2 and gain adjuster 306, phase compensator 303 and gain adjuster 307 for focus servo, phase compensator 304 for radial skew servo, gain adjuster 307, subtractor 310 and inverter 312, tangential skew It includes a servo phase compensator 305, a gain adjuster 309, a subtractor 311 and an inverter 313.

The signal processing circuit 301 receives the detection signal of the photodetector 61 and the detection signals of the first and second light receiving elements 25i to 28i and 25j to 28j of the optical sensors 25 to 28. Further, based on these detection signals, a tracking error signal TE, a focus error signal FE, and an inclination amount signal R of the recording surface of the disk D with respect to the actuator base 21 in the radial skew direction RSD.
S, the inclination signal TS of the recording surface of the disk D with respect to the actuator base 21 in the tangential skew direction TSD, the inclination signal RBS of the bobbin 13 with respect to the actuator base 21 in the radial skew direction RSD, and the actuator base 21 in the tangential skew direction TSD. A tilt amount signal TBS of the bobbin 13 is generated. Further, the tracking error signal TE is output to the phase compensator 302, the focus error signal FE is output to the phase compensator 303, and the tilt amount signals RS and RBS are output.
Is output to the subtractor 310, and the slope amount signals TS and TBS
Is output to the subtractor 311.

More specifically, assuming that the detection signals detected in the detection areas 61A to 61H of the photodetector 61 are SA to SH, for example, the signal processing circuit 301 calculates the tracking error signal TE by an arithmetic expression (SE + SF)-(SG +
SH), and the focus error signal FE is calculated from the arithmetic expression (SA + SC)-(SB + SD).

The signal processing circuit 301 has, for example,
As shown in FIG. 9A, each of the above-mentioned inclination amount signals RS, T
It has a circuit for generating S, RBS, and TBS. FIG.
As shown in (a), the signal processing circuit 301 includes first and second light receiving elements 25i to 25i of the optical sensors 25 to 28.
8i, an adder 320 and a subtractor 321 as calculation means to which the detection signals Is and Js of 25j to 28j are respectively input, and a tilt amount determination unit 322 as a tilt amount determination means.

The adder 320 outputs the detection signals Is and Js
Is added to generate the sum signal 320s, and the inclination amount determination unit 32
Output to 2. The subtractor 321 subtracts the detection signal Js from the detection signal Is and adds it to generate a difference signal 321 s and outputs the difference signal 321 s to the inclination amount determination unit 322. Tilt amount determination unit 322
Calculates and outputs the respective slope amount signals RS, TS, RBS, and TBS based on the levels of the sum signal 320s and the difference signal 321s.

FIG. 10 shows the optical sensors 25-2.
8A is a graph showing an example of the characteristic of FIG. 8, and FIG. 9A is a graph showing the relationship between the distance between the optical sensors 25 to 28 and the disk D or the bobbin 13 to be detected and the level of the sum signal 320s; (B) is a graph showing the relationship between the amount of tilt according to the level of the sum signal 320s and the level of the difference signal. As shown in FIG. 10A, the optical sensors 25 to 28
Of the sum signal 320s obtained from the optical sensor 2
5 to 28 and disk D or bobbin 1 to be detected
The number decreases as the distance to No. 3 increases. Further, as shown in FIG. 10B, the level of the difference signal 321s changes according to the amount of inclination of the disk D or the bobbin 13 with respect to the actuator base 21, but the optical sensors 25 to 28 and the disk D to be detected are changed. Or, when the distance to the bobbin 13 changes, that is, the sum signal 320s
Of the difference signal 3
The level of 21 s also changes.

Therefore, the amount of inclination of the disk D or the bobbin 13 with respect to the actuator base 21 must be uniquely determined regardless of the distance between the optical sensors 25 to 28 and the disk D or the bobbin 13 to be detected. . In the present invention, the above-described tilt amount determination unit 322 is provided with, for example, a circuit as shown in FIG. FIG.
In (b), the memory 326 as a data holding unit
Holds, as a table, the relationship data between the amount of inclination corresponding to the level of the sum signal 320s and the level of the difference signal 320s shown in FIG. 10B in advance. Further, the determination unit 32
5 specifies the slope amount corresponding to the level of the difference signal 321s and the sum signal 320s calculated by the adder 320 and the subtractor 321 with reference to the memory 326, and detects the detected slope amount signal RS (TS, RBS, TBS). ).
With such a configuration, each of the optical sensors 25 to
28, the amount of tilt of the disc D or the bobbin 13 with respect to the actuator base 21 is uniquely determined regardless of the distance between the optical sensors 25 to 28 and the disc D or the bobbin 13 to be detected. be able to.

Further, from the detection signals obtained by the optical sensors 25 to 28, the amount of inclination of the disk D or the bobbin 13 with respect to the actuator base 21 is determined by the optical sensors 25 to 28 and the disk D or the bobbin 13 to be detected. To determine unambiguously regardless of the distance of
In addition to the configuration shown in FIG.
Can be divided by the level of the sum signal 320s, and this can be used as the detected slope amount signal RS (TS, RBS, TBS). In this case, the inclination amount signal RS (TS, RBS, TBS) has a lower inclination amount accuracy than the case shown in FIG. 9A, but the circuit configuration can be simplified.

The tracking error signal TE output from the signal processing circuit 301 is a servo on / off signal SG1.
Are in the servo-on state, the phase is compensated by the phase compensator 302 and input to the gain adjuster 306. Gain adjuster 3
At 06, the gain is adjusted, and currents having the same phase are supplied from the gain adjuster 306 to the first and second tracking coils 16a and 16b, respectively. Thereby, the bobbin 13 is driven in the radial direction of the disk D (tracking direction TRK).

The focus error signal FE output from the signal processing circuit 301 is phase-compensated by the phase compensator 303 while the servo-on / off signal SG2 is in the servo-on state, and is input to the gain adjuster 307. Gain adjuster 3
At 07, the gain is adjusted. Gain adjuster 307
To supply the same phase current to the first to fourth focus coils 15a to 15d, respectively. This allows the bobbin 13 to move in the direction perpendicular to the disk D (focus direction FC
S) is driven. When applying the focus servo, instead of the drive current from the gain adjuster 307,
The focus search current is changed according to the state of the focus search signal SG5 from the first to fourth focus coils 15a to 15a.
5d to stabilize the pull-in of the focus servo.

The slope amount signals RS and RBS output from the slope determination section 322 of the signal processing circuit 301 are
10 is input. In the subtractor 310, the inclination amount signal RS
Is subtracted from the value of the slope amount signal RBS to obtain the deviation signal RS.
E is obtained and input to the phase compensator 304. That is, in the radial skew servo system that controls the tilting of the bobbin 13 in the radial skew direction, a tilt amount signal RS that specifies the detected tilt amount of the recording surface of the disk D with respect to the actuator base 21 is set as a target value, Of the bobbin 13 with respect to the actuator base 21 in the radial skew direction RSD.

The deviation signal RSE is phase-compensated by the phase compensator 304 when the servo-on / off signal SG3 is in the servo-on state, and is input to the gain adjuster 308. The gain adjuster 308 performs gain adjustment, and the gain adjuster 3
08 to the first and third focus coils 15a, 15
The drive current of the same phase is supplied to 5c, and the drive current of the opposite phase is supplied from the inverter 312 to the second and fourth focus coils 15b and 15d. Thereby, bobbin 1
3 is performed in the radial skew direction RSD, and the optical axis 12a of the objective lens 12 is controlled so as to be at a constant angle, that is, perpendicular to the disk with respect to the radial skew direction RSD. When applying the radial skew servo, the radial skew search current is applied to the first to fourth focus coils 15a to 15d in accordance with the state of the radial skew search signal SG6 instead of the drive current from the gain adjuster 308. Supply and stabilize radial skew servo pull-in.

The slope amount signals TS and TBS output from the slope determination section 322 of the signal processing circuit 301 are
11 is input. In the subtractor 311, the inclination amount signal TS
Is subtracted from the value of the inclination amount signal TBS to obtain the deviation signal TS.
E is obtained and input to the phase compensator 305. That is, the tangential skew direction TSD of the bobbin 13
In the tangential skew servo system which controls the tilt of the disk D, the tilt amount signal TS for specifying the tilt amount of the detected recording surface of the disk D with respect to the actuator base 21 is set as a target value, and the target is the actuator base of the bobbin 13 to be controlled. The tilt control for following the tilt amount of the tangential skew direction TSD with respect to 21 is performed.

The deviation signal TSE is phase-compensated by the phase compensator 305 when the servo-on / off signal SG4 is in the servo-on state, and is input to the gain adjuster 309. In the gain adjuster 309, gain adjustment is performed.
09 to the first and second focus coils 15a, 15
The drive current of the same phase is supplied to 5B, and the drive current of the opposite phase is supplied from the inverter 312 to the third and fourth focus coils 15c and 15d. Thereby, bobbin 1
3 is performed in the tangential skew direction TSD, and the optical axis 12a of the objective lens 12 is controlled so as to be at a fixed angle to the disk D, that is, perpendicular to the tangential skew direction TSD. When the tangential skew servo is applied, the tangential skew search current is changed according to the state of the tangential skew search signal SG7 instead of the drive current from the gain adjuster 309 to the first to fourth focus coils 15a. To 15d to stabilize radial skew servo pull-in.

As described above, according to the present embodiment, the radial skew direction RS between the objective lens 12 and the disk D
D, the radial skew direction RSD between the objective lens 12 and the disk D without providing a sensor for directly detecting the relative tilt amount in the tangential skew direction TSD;
The relative tilt amount in the tangential skew direction TSD is determined by the optical sensors 25 to 25 provided on the actuator base 21.
28 and the signal processing circuit 301 indirectly control the tilting of the bobbin 13 in the radial skew direction RSD and the tangential skew direction TSD.
It is possible to reduce the weight of the bobbin 13 while reducing aberrations generated in the reproduction optical system, and to increase the bandwidth of the servo system of the disk drive device and to save power.

Second Embodiment FIG. 11 is a plan view of a lens actuator in a disk drive device according to a second embodiment of the present invention as viewed from the disk D side. FIG. 12 is a side view of the lens actuator shown in FIG. FIG. It should be noted that the disk drive device according to the present embodiment has the same configuration except for the configuration of the lens actuator and the servo circuit for driving the lens actuator, and a description of the configuration other than the lens actuator will be omitted.

As shown in FIG. 11, the lens actuator 601 includes an actuator base 621, an elastic support member 501 fixed to a fixing member 619 on the actuator base 621, a bobbin 613 supported by the elastic support member 501, An objective lens 612 mounted on the bobbin 613, first and second magnets 614a and 614b fixed to the bobbin 613, and provided on the actuator base 21 so as to face the first and second magnets 614a and 614b. And first and second focus coils 615a and 615b and first and second tracking coils 616a and 616b. Further, as shown in FIG. 12, the lens actuator 601 is
1 and an optical sensor 650 disposed at a position facing the objective lens 612. Note that the actuator base 621 corresponds to a specific example of the fixed portion of the present invention, the elastic support member 501 corresponds to a specific example of the elastic support member of the present invention, and the bobbin 613 is a movable portion of the present invention. Corresponds to one specific example.

As shown in FIG. 12, the elastic supporting member 501 is connected to a fixing member 619 provided on the actuator base 621 at a connection portion 510 of the bobbin so as to be substantially parallel to the reference surface 621a of the actuator base 621. 613. Also, the elastic support member 501
The movement of the objective lens 612 in the focus direction FCS, which is a direction substantially perpendicular to the reference plane 621a of the actuator base 621, and the movement of the actuator base 62
Of the objective lens 12 in the tracking direction TRK along the first reference surface 621a and the objective lens 61
Only the tilt in the radial skew direction RSD 2 is elastically allowed independently of each other. Also, the elastic support member 50
In No. 1, the primary resonance frequency of the radial skew direction RSD is set higher than the rotation frequency of the disk D. That is, the radial skew direction R of the elastic support member 501
The torsional rigidity of the SD is designed so that the primary resonance frequency of the radial skew direction RSD is higher than the rotation frequency of the disk D in advance.

The bobbin 613 is supported along the reference surface 621a of the actuator base 621 by being connected to the connection portion 505 of the elastic support member 501. First and second magnets 614a and 614b are provided at positions symmetrical with respect to the center line K of the elastic support member 501 of the bobbin 613, respectively.

First and second focus coils 615
a, 615b are the first on the actuator base 621.
And the second magnets 614a and 614b. These focus coils 615
a and 615b are located symmetrically with respect to the center line K of the elastic support member 501, and the first and second magnets 61
4a and 614b generate a force that causes the bobbin 613 to move directly in the focus direction FCS or tilt in the radial skew direction RSD by electromagnetic forces generated independently of each other.

First and second tracking coils 61
6a and 616b are the first
And the second focus coils 615a and 615b are provided at substantially the same positions. These first and second tracking coils 616a and 616b are provided with the first and second tracking coils.
And the magnets 614a and 614b of the actuator base 621, the bobbin 613 is caused to independently exert forces in opposite directions along the tracking direction TRK along the reference surface 621a of the actuator base 621.

The first and second focus coils 615a and 615b and the first and second tracking coils 616a and 616b are, for example, actuators wound around a nonmagnetic copper core material. It is fixed to the base 621. Further, the actuator base 621 which is relatively close to the first and second magnets 614a and 614b is formed of a non-magnetic material such as SUS303, for example. Thereby, the bobbin 613
The upper first and second magnets 614a and 614b are not affected by other magnetic materials, and the first and second magnets 614a and 614b are not affected by other magnetic materials.
And a driving force substantially proportional to the current supplied to the focusing coils 615a and 615b and the first and second tracking coils 616a and 616b.

First and second magnets 614a, 614a
14b are arranged such that their polarities are opposite when viewed from the objective lens 612 side. As a result, the magnetic flux passing through the vicinity of the objective lens 612 is dominated by the component parallel to the recording surface of the disk D. For example, in a magnetic-field-modulated optical disk drive that performs writing using a vertical magnetic field, the influence of the leakage magnetic field is reduced. It is hard to receive.

The optical sensor 650 is held by a support member 622 fixed to the actuator base 621, and is provided so as to detect the amount of inclination of the surface of the disk D opposite to the objective lens 612 in the radial skew direction RSD. ing. The support member 622 bypasses the surface of the disk D on the side opposite to the objective lens 612 through the outer periphery of the disk D, and supports the optical sensor 650 at the tip thereof. The optical sensor 650 has exactly the same configuration as the optical sensors 27 and 28 in the first embodiment described above, and includes a light emitting element, first and second light receiving elements, a lens, and a filter. The optical sensor 650 includes the objective lens 6
Twelve optical axes 612a, and the first and second light receiving elements are arranged along the radial skew direction RSD.

FIGS. 13 to 15 show the elastic support member 5 described above.
13 is a plan view, FIG. 14 is a side view, and FIG. 15 is a view taken along line AA of FIG.
It is sectional drawing in the line or BB line direction. Elastic support member 5
01 has two parallel arms 503 and 503 and bobbin 1
3 and the actuator base 2
1 and a connecting portion 510 connected to the connecting portion 510.

The arms 503 and 503 have a rectangular cross section and connect the holding portion 504 and the connecting portion 510. The arms 503 and 503 are respectively
The reference surface 21a of the actuator base 21, that is,
It is provided in parallel with the recording surface of the disk D. Arm 5
The center of gravity G of 03,503 is located on the central axis K of the elastic support member 501.

The elastic support member 501 is provided for each arm 503,
A first hinge 512 connecting one end of the arm 503 to the connecting portion 510;
4 and a second hinge 518 connecting the second hinge 518 with the second hinge 518. The first hinge 512 is bendable only in the focus direction FCS, and maintains a neutral position by an elastic force when no external force is applied. The second hinge 518 is bent in the focus direction FCS and is rotatable around itself, and maintains a neutral position by elastic force when no external force is applied.

As shown in FIG. 15, the elastic supporting members 501 are formed at two predetermined positions along the longitudinal direction of each of the arms 503 and 503 along a plane parallel to the focus direction FCS including the central axis K. And a pair of thin plate-shaped third hinges 515a and 515b. Third hinge 515
a, 515b are focus directions FCS including the central axis K
Can be bent only in the direction perpendicular to the plane parallel to the plane, and when no external force acts, the neutral position is maintained by the elastic force.

FIG. 13 and FIG.
As shown in FIG. 4, a holding portion 504 for holding the bobbin 13 has a connection fixing portion 505 for connecting to the bobbin 13 at the center of the tip, and a fourth hinge 520 is provided between the connection fixing portion 505 and the holding portion 504. Are provided in two places. Fourth hinge 520
Can be bent only in the tracking direction TRK, and when no external force acts, the neutral position is maintained by the elastic force.

The elastic support member 501 is integrally formed of a material having excellent elasticity and mechanical properties and excellent bending fatigue properties, for example, a resin material such as a thermoplastic elastomer.

In the above-mentioned elastic support member 501, the fourth hinge 520 is bent so that the bobbin 13 can be moved in the tracking direction TRK. In addition, 2
Book arms 503, 503 and first and second hinges 5
12, 518 are the holding portion 504 of the elastic support member 501.
And a link mechanism that creates a degree of freedom in the focus direction FCS (direction perpendicular to the recording surface of the disc D).
Thereby, the objective lens 12 mounted on the bobbin 13 is
Is moved in the focus direction FCS. Further, the tilting of the holding portion 504 of the elastic support member 501 about the central axis K is performed by, for example, the holding portion 50 of the elastic support member 501.
When a torsional force in the radial skew direction RSD acts on 4,
A third hinge 515a of the two arms 503, 503,
Of the 515b, the third hinge 515b located on the connecting portion 510 side is bent in the directions of the arrows L1 and L2 shown in FIG. That is, the center of gravity G of the two arms 503 and 503
Are bent in directions opposite to each other with respect to a plane parallel to the focus direction FCS. Further, a third hinge 515a,
Of the 515b, the third hinge 515a located on the holding portion 504 side is bent in the directions of the arrows U1 and U2 shown in FIG. In addition, the pair of third hinges 515a and 515b formed on the same arm 503 are bent in opposite directions.

The bending of the third hinges 515a and 515b allows the holding portion 504 of the elastic support member 501 to tilt around the central axis K. Further, with the tilting of the holding portion 504 of the elastic support member 501 around the central axis K, each of the second hinges 518 rotates itself, thereby facilitating the tilting of the holding portion 504 of the elastic support member 501. ing.

FIG. 16 is a diagram showing a configuration of a servo circuit for driving the lens actuator 611 according to the present embodiment. As shown in FIG. 16, a signal processing circuit 401 to which a detection signal 61 s of the photodetector 61 and a detection signal of the optical sensor 650 are input, a phase compensator 402 and a gain adjuster 405 for tracking servo, and a phase for focus servo Compensator 403 and gain adjuster 4
06, a low-pass filter 404 for tilt control in the radial skew direction RSD direction, a gain adjuster 407, and an inverter 408.

When the detection signals detected in the respective detection areas 61A to 61H of the photodetector 61 are SA to SH, the signal processing circuit 401 obtains, for example, a tracking error signal TE from an arithmetic expression (SE + SF)-(SG + SH), and focuses. Expression for calculating the error signal FE (SA + SC)
It is determined from-(SB + SD). Also, the signal processing circuit 40
1 calculates a tilt amount of the disk D with respect to the actuator base 21 from a sum signal and a difference signal of detection signals of the first and second light receiving elements of the optical sensor 650, and outputs the calculated tilt amount signal RS in the radial skew direction RSD. I do. Note that the tilt amount signal RS is obtained by the same method as in the first embodiment, and therefore, the description is omitted.

The cut-off frequency of the low-pass filter 404 is set so that a frequency component equal to or higher than the primary resonance frequency of the radial skew direction RSD of the elastic support member 501 included in the inclination signal RS in the radial skew direction RSD is removed. I have.

The tracking error signal TE output from the signal processing circuit 401 is the servo on / off signal SG1
Are phase-compensated by the phase compensator 402 in a servo-on state, and input to the gain adjuster 405. Gain adjuster 4
At 05, the gain is adjusted, and currents having the same phase are supplied from the gain adjuster 405 to the first and second tracking coils 616a and 616b, respectively. Thus, the bobbin 13 is driven in a direction along the reference surface 621a of the actuator base 621, that is, in the radial direction of the disk D (tracking direction TRK).

The focus error signal FE output from the signal processing circuit 401 is phase-compensated by the phase compensator 403 while the servo-on / off signal SG2 is in the servo-on state, and is input to the gain adjuster 406. Gain adjuster 4
At 06, the gain is adjusted. Gain adjuster 406
Are supplied to the first and second focus coils 615a and 615b, respectively. As a result, the bobbin 613 is driven in a direction perpendicular to the disk D (focus direction FCS). When the focus servo is applied, instead of the drive current from the gain adjuster 406, a focus search current is supplied to the first and second focus coils 615a and 615b according to the state of the focus search signal SG4. Stabilize the focus servo pull-in.

The tilt signal RS in the radial skew direction RSD output from the signal processing circuit 401 is filtered by the low-pass filter 404 while the tilt control on / off signal SG3 is on, and the radial skew of the elastic support member 501 is changed. Frequency components equal to or higher than the primary resonance frequency of the direction RSD are removed. This signal is supplied to a gain adjuster 40
7, a driving current having the same phase that generates a driving force proportional to a signal from which a frequency component equal to or higher than the primary resonance frequency of the radial skew direction RSD is removed is supplied to the first focus coil 615a, and the inverter 308 Then, a driving current having an opposite phase is supplied to the second focus coil 15b. Accordingly, the tilt control of the bobbin 613 is performed, and the angle of the optical axis 612a of the objective lens 612 with respect to the disk D is controlled to be constant, that is, to be vertical. In the present embodiment, no optical sensor is disposed on the bobbin 613 to be controlled. Therefore, the skew of the bobbin 613 is corrected by open control using the output of the optical sensor 650 disposed on the actuator base 621. ing. The primary resonance frequency of the elastic support member 501 in the radial skew direction RSD is set sufficiently higher than the rotation frequency of the disk D, and the sensor output of the optical sensor 650 after passing through the low-pass filter 404 includes the rotation of the disk D. The tilting operation of the bobbin 13 following the fluctuation of the AC component of the skew of the disc D includes the fluctuation component of the tilt amount synchronized with the cycle.

[0069]

According to the present invention, the amount of inclination of the recording surface of the recording medium can be reduced without mounting a sensor for directly detecting the relative inclination between the recording surface of the recording medium and the movable portion on the movable portion. , The high-speed tilting control of the objective lens can be performed, so that it is possible to reduce the aberration generated in the optical system, increase the bandwidth of the device, and save power.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a disk drive device of the present invention.

FIG. 2 is a plan view showing a configuration of a lens actuator according to one embodiment of the present invention.

FIG. 3 is a side view of the lens actuator shown in FIG. 2;

FIG. 4 is a diagram illustrating an example of a configuration of a photodetector.

FIG. 5 is a perspective view showing an example of the structure of the elastic support member.

FIG. 6 is a diagram showing a configuration example of optical sensors 25 and 26.

FIG. 7 is a diagram showing a configuration example of optical sensors 27 and 28.

FIG. 8 is a circuit diagram showing an example of a servo circuit of the lens actuator according to one embodiment of the present invention.

FIG. 9 is a diagram illustrating an example of a circuit that generates inclination amount signals RS, TS, RBS, and TBS.

FIG. 10 is a diagram illustrating an example of characteristics of an optical sensor.

FIG. 11 is a plan view illustrating a configuration of a lens actuator in a disk drive device according to a second embodiment of the present invention.

FIG. 12 is a side view of the lens actuator of FIG. 11;

FIG. 13 is a plan view showing the structure of an elastic support member 501.

FIG. 14 is a side view showing the structure of the elastic support member 501 of FIG.

15 is a cross-sectional view taken along line AA or BB in FIG.

FIG. 16 is a circuit diagram illustrating an example of a servo circuit of a lens actuator in a disk drive device according to a second embodiment of the present invention.

FIG. 17 is a diagram showing an example of the structure of a conventional lens actuator.

FIG. 18 is a view showing another example of the structure of a conventional lens actuator.

19 is a side view of the lens actuator shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk drive device, 2 ... Optical pickup, 1
DESCRIPTION OF SYMBOLS 1 ... Lens actuator, 12 ... Objective lens, 13 ...
Bobbin, 21: Actuator base, 31: Elastic support member, 14: Magnet, 15a to 15d: Focus coil, 16a, 16b: Tracking coil, 25,
26, 27, 28 ... optical sensors.

Claims (36)

[Claims] At least one of a rotation drive means for rotating a disk-shaped recording medium and optical data recording and reproduction between the recording medium and a recording medium provided movably with respect to a recording surface of the recording medium. A disk drive device comprising: an optical pickup that performs: a fixing portion provided on the optical pickup; a fixing portion that is supported to be tiltable in a predetermined direction with respect to the fixing portion; A movable unit on which an objective lens to be focused is mounted, a driving unit for tilting the movable unit, a recording surface inclination amount detecting unit for detecting an inclination amount of the recording surface with respect to the fixed unit in the predetermined direction, A movable part inclination amount detecting means for detecting an inclination amount of the movable part with respect to a fixed part; and a recording surface inclination amount detecting means and the movable part inclination amount detecting means. It has been based on the inclination amount, the disk drive device having a tilt control means for the angle of the optical axis of the objective lens with respect to the recording surface causing the tilting of the movable portion to said drive means so as to be constant. 2. The tilt control means performs tilt control of the movable portion such that the detected tilt amount of the recording surface is set as a target value and the tilt amount of the movable portion follows the tilt amount of the recording surface. 2. The disk drive device according to 1. 3. The disk drive device according to claim 2, wherein said tilt control means causes said driving means to generate a driving force corresponding to a deviation between the detected recording surface tilt amount and the detected movable portion tilt amount. . 4. The disk drive according to claim 1, wherein said movable portion is supported so as to be tiltable in at least one of a radial skew direction and a tangential skew direction. 5. The optical sensor according to claim 1, wherein said movable section tilt amount detecting means includes: a light emitting means for outputting a light beam toward said movable section; and a light receiving means for detecting the amount of received light. 2. The disk drive device according to claim 1, further comprising: a reflection unit provided on the movable unit and configured to reflect a light beam output from the light emitting unit toward the light receiving unit. 3. 6. The optical sensor includes a light emitting element for outputting light, and first and second light receiving elements for detecting the amount of received light, and wherein the movable part inclination amount detecting means includes a first light emitting element and a second light receiving element. And a calculating means for calculating a difference signal and a sum signal of the detection signals of the second light receiving element; and a tilt amount determining means for specifying and outputting the movable section tilt amount from the difference signal and the sum signal. 6. The disk drive device according to 5. 7. The disk drive device according to claim 6, wherein said first and second light receiving elements are arranged along said predetermined direction. 8. The tilt amount determining means includes a data holding unit that holds relational data between the amount of tilt of the movable unit and the level of the difference signal according to the level of the sum signal. 8. The disk drive device according to claim 7, wherein the amount of inclination of the movable portion corresponding to the level of the difference signal and the sum signal is specified with reference to the data holding portion, and is output as the detected amount of inclination of the movable portion. 9. The tilt amount determining means outputs a value proportional to a value obtained by dividing the level of the calculated difference signal by the level of the calculated sum signal as a detected movable portion tilt amount.
A disk drive device according to claim 1. 10. A recording surface tilt amount detecting means provided on the fixed portion, for outputting a light beam toward the recording surface, and a light receiving means for detecting an amount of reflected light reflected on the recording surface. 2. The disk drive device according to claim 1, further comprising: an optical sensor comprising: 11. The optical sensor includes a light emitting element for outputting light, and first and second light receiving elements for detecting the amount of received light, and wherein the recording surface tilt amount detecting means includes the first and second light receiving elements. And calculating means for calculating a difference signal and a sum signal of the detection signals of the second light receiving element; and tilt amount determining means for specifying and outputting the recording surface tilt amount from the difference signal and the sum signal. The disk drive device according to claim 10. 12. The disk drive device according to claim 11, wherein said first and second light receiving elements are arranged along said predetermined direction. 13. The tilt amount determining means has a data holding unit for holding relation data between the recording surface tilt amount according to the level of the sum signal and the level of the difference signal. 13. The disk drive device according to claim 12, wherein a recording surface tilt amount corresponding to the level of the difference signal and the sum signal is specified with reference to the data holding unit, and is output as the detected recording surface tilt amount. 14. The recording surface inclination amount detection means according to claim 12, wherein said inclination amount determination means outputs a value proportional to a value obtained by dividing the calculated level of the difference signal by the level of the calculated sum signal. Disk drive device. 15. The disk according to claim 10, wherein the optical sensor is arranged so as to be able to detect the tilt amount of the recording surface on the same track as the track of the recording medium where the optical axis of the objective lens is located. Drive device. 16. The disk drive device according to claim 10, wherein said optical sensor is provided on a side opposite to said objective lens with said recording medium interposed therebetween. 17. The disk drive according to claim 16, wherein said optical sensor is disposed on an optical axis of said objective lens or near an optical axis of said objective lens. 18. The optical sensor according to claim 17, wherein the optical sensor is fixed to a support member provided so as to detour from one surface side of the recording medium to the other surface side through the outer periphery with respect to the fixing portion.
A disk drive device according to claim 1. 19. An optical pickup comprising: a light source that emits the light beam; an optical system that guides the light beam to the objective lens; and a reflection of an object disposed to face the objective lens from a facing surface. The disk drive device according to claim 1, further comprising: a light detection unit that detects light; and an optical system that guides the reflected light to the light detection unit. 20. The movable portion is supported so as to be movable in a focus direction and a tracking direction with respect to a recording surface of the recording medium, and the driving means moves the movable portion in the focus direction and the tracking direction. 20. The disk drive device according to claim 19, further comprising: servo means for controlling movement of the movable part in a focus direction and a tracking direction based on a detection signal of the light detection means. 21. At least one of recording and reproducing of optical data between a rotation drive means for rotating a disk-shaped recording medium and a recording medium provided movably with respect to a recording surface of the recording medium. A disk drive device comprising: an optical pickup that performs: a fixed portion provided on the optical pickup; and a support portion that is tiltably supported in a predetermined direction with respect to the fixed portion, and that transmits a light beam to a recording surface of the recording medium. A movable unit on which an objective lens to be focused is mounted, a driving unit for tilting the movable unit, a recording surface inclination amount detecting unit for detecting an inclination amount of the recording surface with respect to the fixed unit in the predetermined direction, Based on the amount of tilt detected by the recording surface tilt amount detecting means, the driving means controls the driving means such that the angle of the optical axis of the objective lens with respect to the recording surface becomes constant. A disk drive device having a tilt control means for causing the tilting of the moving parts. 22. An apparatus according to claim 21, further comprising: an elastic support member configured to elastically support the movable portion with respect to the fixed portion in the predetermined direction so that the movable portion can be elastically tilted. A low-pass filter that is included in the detection signal and removes a frequency component equal to or higher than a primary resonance frequency in the predetermined direction of the spring-mass system including the elastic support member and the movable portion. 22. The disk drive device according to claim 21, further comprising: a driving force generation unit that generates a driving force proportional to the signal from which the frequency component signal has been removed. 23. A primary resonance frequency of the spring-mass system including the elastic support member and the movable portion in the predetermined direction is set higher than a rotation frequency of the recording medium by the rotation driving unit. 23. The disk drive device according to 22. 24. A recording surface tilt amount detecting means provided on the fixed portion, for outputting a light beam toward the recording surface, and a light receiving means for detecting an amount of reflected light reflected on the recording surface. 22. The disk drive device according to claim 21, further comprising: an optical sensor comprising: 25. An optical sensor comprising: a light-emitting element for outputting light; and first and second light-receiving elements for detecting the amount of received light; And calculating means for calculating a difference signal and a sum signal of the detection signals of the second light receiving element; and tilt amount determining means for specifying and outputting the recording surface tilt amount from the difference signal and the sum signal. 25. The disk drive device according to 24. 26. The disk drive according to claim 25, wherein said first and second light receiving elements are arranged along said predetermined direction. 27. The tilt amount determining means has a data holding unit for holding relation data between the recording surface tilt amount according to the level of the sum signal and the level of the difference signal. 26. The disk drive device according to claim 25, wherein a recording surface inclination amount corresponding to the level of the difference signal and the sum signal is specified with reference to the data holding unit, and is output as the detected recording surface inclination amount. 28. The recording surface inclination amount detection means according to claim 25, wherein said inclination amount determination means outputs a value proportional to a value obtained by dividing the calculated level of the difference signal by the level of the calculated sum signal. Disk drive device. 29. The disk according to claim 24, wherein the optical sensor is arranged so as to be able to detect the tilt amount of the recording surface on the same track as the track of the recording medium where the optical axis of the objective lens is located. Drive device. 30. The disk drive device according to claim 24, wherein the optical sensor is provided on a side opposite to the objective lens with the recording medium interposed therebetween. 31. The disk drive according to claim 30, wherein the optical sensor is disposed on an optical axis of the objective lens or near an optical axis of the objective lens. 32. The optical sensor according to claim 30, wherein the optical sensor is fixed to a support member provided to detour from the one surface side of the recording medium to the other surface side through the outer periphery with respect to the fixing portion.
A disk drive device according to claim 1. 33. An optical pickup, comprising: a light source that emits the light beam; an optical system that guides the light beam to the objective lens; and a reflection of an object disposed to face the objective lens from a facing surface. 22. The disk drive device according to claim 21, further comprising: a light detection unit that detects light; and an optical system that guides the reflected light to the light detection unit. 34. The movable portion is supported so as to be movable in a focus direction and a tracking direction with respect to a recording surface of the recording medium, and the driving means moves the movable portion in the focus direction and the tracking direction. 32. The disk drive device according to claim 31, further comprising: a servo unit that controls the movement of the movable unit in a focus direction and a tracking direction based on a detection signal of the light detection unit. 35. A light source for outputting a light beam, a fixed portion, a movable portion mounted with an objective lens for converging the light beam, and supported to be tiltable in a predetermined direction with respect to the fixed portion; A first optical sensor provided for detecting an amount of inclination of the movable part with respect to the fixed part in the predetermined direction; and an object facing the object provided on the fixed part and opposed to the objective lens. An optical pickup, comprising: a second optical sensor for detecting an amount of inclination of a surface with respect to the fixed portion; and a drive unit for inclining the movable portion in the predetermined direction. 36. A light source for outputting a light beam, a fixed portion, a movable portion mounted with an objective lens for converging the light beam, and supported to be tiltable in a predetermined direction with respect to the fixed portion; An optical sensor for detecting the amount of inclination of the object facing the objective lens, which is disposed opposite to the objective lens, with respect to the fixed portion; and a driving unit for tilting the movable portion in the predetermined direction. Optical pickup.