JP2003217226A - Disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily discriminate the shape of a disk with which a turntable is selectively loaded. <P>SOLUTION: A disk drive is constructed to rotationally drive the turntable at a low speed by moving a reflection type skew sensor 32 of a skew servo mechanism to a measuring point P1 corresponding to the neighborhood on the outer periphery of the optical disk 13 when the turntable is selectively loaded with one of several kinds of the optical disks 13 varying in shapes and to discriminate the shape of this optical disk 13 by the pattern of the quantity of the light received in the sensor 32 by irradiating the signal surface 13a of the optical disk 13 with the detecting light DL of the sensor 32 and reflecting and receiving this light. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc drive device suitable for being applied to an optical disc drive device for recording and / or reproducing data on an optical disc such as a CD / DVD, and more particularly to a circular disc drive device. CD / DVD
The present invention belongs to the technical field of a disk drive device capable of sharing disks having different shapes such as a card type CD / DVD and the like.

[0002]

2. Description of the Related Art Conventionally, in an optical disc drive device, optical discs of different sizes such as 8 cm CD / DVD and 12 cm CD / DVD are selectively mounted on a turntable of a spindle motor to be rotationally driven and emitted from an optical pickup. The optical beam is focused on the signal surface of the optical disc, and the optical pickup is guided by the two traveling guides so as to travel (seek) along the radial direction of the optical disc in the direction parallel to the signal face of the optical disc. It is configured to be able to record and / or reproduce data on the optical disc.

However, since the optical disk is a thin disk, the optical disk mounted on the turntable and rotationally driven is apt to warp, and particularly the outer peripheral portion of the optical disk is apt to be greatly warped. When the optical disc mounted on the turntable and rotationally driven is warped, the signal surface of the optical disc is tilted with respect to the optical axis of the light beam emitted from the optical pickup, and the light converged by the objective lens is converged. The beam cannot be irradiated / reflected perpendicularly to the signal surface of the optical disc, and the data recording and / or reproducing performance is deteriorated. In particular, in a high-density optical disc such as a DVD (Digital Versatile Disk), the wavelength of the light beam is shortened and the NA of the objective lens is increased in response to the increase in the density. There is a problem in that the recording and / or reproducing performance of data is significantly deteriorated even with a small inclination of the signal surface.

Therefore, conventionally, in the optical disk drive device, the skew sensor detects that the signal surface is inclined with respect to the optical axis of the objective lens due to the warp of the optical disk, and the objective lens is moved with respect to the signal surface of the optical disk. A skew servo mechanism is provided so as to follow the optical axis in a vertical direction.

[0005]

On the other hand, in recent years, a non-circular CD-ROM / DVD-ROM has appeared for sales promotion, and a card type is particularly remarkable. And these non-circular CD-ROMs / DVD-ROMs are originally CDs.
/ DVD standard disc, these non-circular CD-ROMs
If the / DVD-ROM is mounted in an optical disk drive and driven to rotate, the weight, inertia, etc. are out of the regulation, and there is a problem that stable control is hindered. In the conventional optical disc drive device, since the optical disc shape discriminating means for discriminating whether the optical disc is circular or non-circular such as a card type is not mounted, a non-circular optical disc such as a card type is When mounted, it is impossible to adopt a method of recording and / or reproducing data by reducing the rotation speed of the turntable.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a disk drive device capable of easily discriminating the shape of a disk selectively mounted on a turntable. Has an aim.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, a disk drive device of the present invention is characterized in that a light beam is converged by an objective lens on a signal surface of a disk mounted on a turntable and driven to rotate. An optical pickup for recording and / or reproducing data on a disc, and a reflection type skew sensor mounted on the optical pickup to detect an inclination of a signal surface of the disc, and a light beam of the objective lens with respect to the signal surface of the disc. In a disk drive device equipped with a skew servo mechanism for correcting the optical axis of the disc, several types of discs having different shapes are selectively mounted on the turntable. A disc mounting detection means for detecting that one is selectively mounted on the turntable; Means for, based on the detection of disk loading, the reflective skew sensor is moved to the measurement point corresponding to the vicinity of the outer periphery of the disk, for rotating the said turntable at a low speed by the disc attachment detecting means,
A means for irradiating and reflecting the detection light of the reflection type skew sensor moved to the measurement point to the signal surface of the disk to receive the light, and determining the shape of the disk according to the pattern of the amount of light received by the reflection type skew sensor. It is equipped with and.

In the disk drive device of the present invention having the above-described structure, when one of several kinds of disks having different shapes is selectively mounted on the turntable, the reflection type skew sensor of the skew servo mechanism is used for the disk. Move to a measurement point near the outer circumference, rotate the turntable at low speed, and irradiate and reflect the light detected by the reflective skew sensor on the signal surface of the disk to receive the shape of the disk. Is determined by the pattern of the amount of light received by the reflection type skew sensor.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an optical disk drive device in which the present invention is applied to an optical disk drive device such as a DVD recorder and a DVD player will be described in the following order with reference to FIGS. (1) ・ ・ ・ Explanation of the entire optical disk drive device (FIG. 1) (2) ・ ・ ・ Explanation of the skew servo mechanism (FIGS. 2-8) (3) ・ ・ ・ Explanation of the disk shape measuring mechanism (FIG. 9) (Fig. 14)

(1) Description of Entire Optical Disk Drive Device First, referring to FIG. 1, the entire optical disk drive device 10 such as a CD / DVD player, which is the disk drive device of the present invention, will be described. Has an optical disk drive device main body 11 configured in a flat rectangular box shape, and a flat disk tray 12. Then, from the tray entrance 11b formed horizontally on the front panel 11a of the optical disc drive device main body 11 to the disc tray 12
Is configured to be horizontally loaded / unloaded in and out of the main body 11 of the optical disc drive apparatus by a disc tray loading mechanism (not shown).

The optical disk drive device 10
In using the disk tray 12, the disk tray 12 is unloaded outside the optical disk drive main body 11 in the direction of the arrow b, and the optical disk 13 such as a DVD is formed in the upper surface of the disk tray 12 and has a substantially circular disk positioning recess. 12a, the disc tray 12 is placed horizontally in the optical disc drive apparatus main body 11 and then the arrow a
Load in the direction. Then, the optical disk 13 is mounted (chucked) on the turntable of the spindle motor, which will be described later, installed in the optical disk drive device body 11, and the optical disk 13 is floated above the recess 12 a of the disk tray 12. Is driven to rotate,
Data is recorded and / or reproduced on the signal surface of the optical disc 13 by an optical pickup described later.

After recording and / or reproducing the data on the optical disk 13, the optical disk drive device main body 1
When the eject button 11c provided on the front panel 11a of No. 1 is pressed, the optical disk 13 is detached (unchucked) from the turntable of the spindle motor and placed again in the recess 12a of the disk tray 12. After that, the disc tray 12 is configured to be unloaded outside the optical disc drive apparatus main body 11 in the direction of arrow b.

(2) Description of Skew Servo Mechanism Next, the skew servo mechanism mounted in the optical disk drive apparatus body 11 of the optical disk drive apparatus 10 will be described with reference to FIGS. First, B
A single chassis 14 called a U chassis (Base Unit Chassis) has an optical pickup 23, a spindle motor 27, a skew servo mechanism M1 which is an example structure of a skew servo mechanism, and a sled drive mechanism M2. The mechanism is installed. The chassis 14 is driven up and down with respect to the second chassis in the optical disk drive device body 11 by a lifting mechanism (none of which is shown) by a rotating motion around a fulcrum portion, etc. The optical disc 13 is chucked / unchucked to the turntable 27a at the upper end of the optical disc 27 and the signal surface 1 which is the lower face of the optical disc 13
Objective lenses 21, 2 of the optical pickup 23 for 3a
It is configured such that two proximity / separation operations are performed.

The skew servo mechanism M1 is
One or two objective lenses 21 of the optical pickup 23,
22 and a sled 24, which is a slide base on which a reflection type skew sensor 32 that is a skew detecting means is mounted, along the radial direction of the optical disc 13.
8 is a vertical direction with respect to the chassis 14 of the guide shafts 15 and 16 which are two parallel running guides having the same length L and which guide in the X direction which is the direction parallel to the signal surface 13a on the lower surface of FIG. The signal surface 13a of the optical disc 13 shown
By controlling the tilt in the XZ direction which is the vertical direction with respect to the optical disk 13 in which the tilt in the radial direction occurs.
Is configured so that the skew servo in the radial direction, that is, the radial skew in which the optical axis F of the optical beam OB (Optical Beam) of the objective lenses 21 and 22 is made to be perpendicular to the signal surface 13a of FIG. It was done.

First, the front end of the chassis 14 (see FIGS. 2 and 3).
A spindle motor 27 is vertically mounted in an upward direction at an end portion on the left side in FIG. 4, and a turntable 27a which is rotated integrally with the rotor is horizontally arranged at an upper end of the spindle motor 27. . Then, the optical disk 13 is chucked horizontally on the turntable 27a and is rotationally driven by the spindle motor 27.

On the rear side of the spindle motor 27, a large rectangular opening 1 is formed in the center of the chassis 14.
4a is opened, and two guide shafts 15 and 16 which are parallel to the X direction and have the same length are horizontally arranged along both sides of the opening 14a. One ends 15a, 16a of the 16 arranged on the inner peripheral side with respect to the optical disc 13 are rotatably supported in the Z direction with respect to the chassis 14 by two fulcrum portions 17 attached to the front upper part of the chassis 14. . At this time, each of these fulcrums 17 has a support member 17a formed of a synthetic resin having a bending performance fitted to the outer circumference of one end 15a, 16a of each guide shaft 15, 16, and the thin portion of the support member 17a. 17b is screwed onto the chassis 14 via a pedestal 17c by a set screw 17d. Then, the thin portion 17b of the support member 17a
The guide shafts 15 and 16 are rotatably supported in the Z direction with respect to the chassis 14 by utilizing the bending of the guide shafts.

Then, these two guide shafts 1
The positions near the other ends 15b and 16b of the optical disks 5 and 16 arranged on the outer peripheral side with respect to the optical disk 13 can be moved up and down in the Z direction by being guided by two guide members 25 attached to the upper part on the rear end side of the chassis 14. Supported by.
At this time, each guide member 25 is formed of synthetic resin or the like, is screwed onto the chassis 14 by a set screw 25a, and each guide member is guided in a vertical guide groove 25b formed in the guide member 25. Shaft 15, 1
The positions near the other ends 15b and 16b of 6 are guided in the Z direction. Therefore, these guide members 25 restrict the movement of the two guide shafts 15 and 16 in the Y direction which is a direction perpendicular to the X direction.

The optical pickup 23 shown here
Includes, for example, two objective lenses 21 and 22 compatible with CD and DVD and a reflection type skew sensor 32.
The sled 24, on which the optical pickup 23 is mounted, is placed so as to straddle between the two guide shafts 15 and 16, and is disposed in the opening 14 a of the chassis 14. Then, the thread 24 is inserted into the opening 14a of the chassis 14 so that the two guide shafts 1
The optical pickup 23 is configured to be driven to seek in the X direction, which is the radial direction of the optical disk 13, by being guided by 5 and 16 and driven to travel in the X direction.
At this time, a pair of thrust bearings 24a provided on one side of the thread 24 are inserted into the outer circumference of one guide shaft 16 which is the main guide shaft, and the thread 2
A slide guide 24b provided on the other side of the optical disc 4 is engaged with the other guide shaft 15, which is a sub-guide shaft, with play, and this sled 24 uses one of the guide shafts 16 as a running reference for the optical disc. It is configured to be driven to travel in the X direction, which is the radial direction of 13.

The sled drive mechanism M2 for driving the sled 24 to travel in the X direction along the two guide shafts 15 and 16 is provided on one side of the opening 14a of the chassis 14 (on one guide shaft 16 side). Part) is parallel to the guide shaft 16 and is horizontally mounted on a sled motor 28 such as a stepping motor. Inside the sled motor 28, the sled motor 28 is mounted on the chassis 14 parallel to the guide shaft 16 and horizontally rotatable. And a lead screw 30 that is rotationally driven by a motor 28 via a plurality of gears 29, and is molded of synthetic resin or the like.
The thread 24 is fixed to one side of the thread 24, and is constituted by a substantially rack-shaped engaging portion 31 engaged with the spiral groove 30 a of the lead screw 30. The engaging portion 31
Is elastically pressed and engaged in the spiral groove 30a of the lead screw 30 by a preload spring 31a which is a preload means interposed between the thread 24 and one side thereof. Then, the sled motor 28 causes the plurality of gears 2
By rotating the lead screw 30 in both forward and reverse directions via the screw 9, the thread 24 is slid in the X direction at a constant pitch via the engaging portion 31 by the spiral groove 30a of the lead screw 30. Has been done.

Then, the two guide shafts 15 and 16
The skew servo mechanism M1 for adjusting the inclination of the chassis 14 in the Z direction is mounted on the upper ends of the rear ends of the chassis 14, which are the other ends 15b and 16b of the guide shafts 15 and 16. That is, the skew servo mechanism M1 uses a slide cam 18 formed of synthetic resin or the like and having a substantially prismatic shape. The slide cam 18 is arranged on the upper portion of the rear end side of the chassis 14 so as to extend across the other ends 15b and 16b of the two guide shafts 15 and 16 and is orthogonal to the guide shafts 15 and 16. And the Y direction, which is the tangential direction with respect to the signal surface 13a of the optical disc 13. The slide cam 18 is guided by the slide guide mechanism on the chassis 14 so as to be slidable in the Y direction, which is the longitudinal direction, and the slide guide mechanism is vertically mounted on the chassis 14, for example. A pair of guide pins 18a that are spaced apart in the Y direction, and are formed on the lower surface of the slide cam 18 in parallel with the Y direction and at intervals in the Y direction, and are inserted into the pair of guide pins 18a. And a pair of guide grooves 18b that are formed.

A first cam surface 19 and a second cam surface 20, which are a pair of cam surfaces inclined at the same angle θ along the Y direction, are integrally formed at both ends in the length direction of the slide cam 18. ing. In addition, these first and second cam surfaces 19,
Reference numeral 20 denotes a first and a second formed on both ends of the slide cam 18.
It is formed on the upper side surface of the long holes 19a and 20a. And the other ends 15b, 1 of the two guide shafts 15, 16
6b is the first and second cam surfaces 19, 20 of the slide cam 18.
Further, a pair of preload springs 26 composed of compression coil springs, which are elastic pressing means, are elastically pressed from below. The pair of preload springs 26 are vertically installed in, for example, the central portions of the bottom portions of the guide grooves 25b of the pair of guide members 25.

A slide cam drive means m1 for guiding the slide cam 18 by a pair of guide pins 18a and a guide groove 18b to slide it in the Y direction is mounted at the center of the rear end of the chassis 14. The slide cam drive means m1 is a stepping motor 33 which is a drive motor vertically mounted on the chassis 14.
An output gear 34 fixed to the upper end of the motor shaft of the stepping motor 33, and an input gear 34 rotatably attached to the upper end of a spindle attached to the chassis 14 and rotationally driven by the output gear 34 ( Reduction gear) 35
And a pinion 36 concentrically integrally formed on the lower surface of the input gear 35, and a rack 37 integrally molded on the back surface of the slide cam 18 and driven by the pinion 36.

Then, the thread 2 of the optical pickup 23
An upward reflection-type skew sensor 32 is mounted on the surface 4 of FIG.
As shown in FIG. 2, one light emitting element 32a composed of a light emitting diode (LED) or the like and two photodiodes or the like arranged side by side along the X direction (radial direction) which is the traveling direction of the optical pickup 23. One light receiving element 3
2b and 32c. Then, the reflected light RL of the detection light DL emitted from one light emitting element 32a to the signal surface 13a of the optical disk 13 which is horizontally chucked on the turntable 27a and is rotationally driven by the spindle motor 27 is used as two light receiving elements. 32b,
Light is received (detected) at 32c. At this time, if the signal surface 13a of the optical disk 13 is tilted in the radial direction, the light receiving amounts of the two light receiving elements 32b and 32c will change,
The tilt amount and tilt direction of the signal surface 13a of the optical disk 13 in the radial direction can be simultaneously detected by the difference in the amount of light received by the two light receiving elements 32b and 32c.

According to the optical disk drive device 10 configured as described above, the optical disk 13 chucked horizontally on the turntable 27a is rotationally driven by the spindle motor 28. Then, the light beam OB is directed to the signal surface 13a, which is the lower surface of the optical disk 13, by one of the objective lenses 21 and 22 of the optical pickup 23.
Sled drive mechanism M in a state of being vertically converged on
The lead screw 30 is rotationally driven in both forward and reverse directions by the two thread motors 28 via the plurality of gears 29, so that the thread 24 has two guide shafts 1.
The optical pickup 23 is slid at a constant pitch in the X direction while being guided by the reference numerals 5 and 16, and the optical pickup 23 seeks in the X direction.
Data is recorded and / or reproduced in a.

Next, the skew servo operation in the radial direction by the skew servo mechanism M1 will be described. That is, when the signal surface 13a is tilted in the radial direction due to the warp of the optical disk 13 which is rotationally driven by the spindle motor 27, the reflection type skew sensor 32 detects the tilt of the signal surface 13a in the radial direction. To be done. Then, the stepping motor 33 of the slide cam driving means m1 is rotationally driven according to the detection result of the reflection type skew sensor 32, and the output gear 3
The slide cam 18 is slid in the Y direction via the rack 37 by the pinion 36 which is decelerated via the gear 4 and the reduction gear 35 and is rotationally driven.

Then, as shown in FIG. 7, the first and second cam surfaces 19 and 20 of the slide cam 18 which are inclined at the same angle θ are simultaneously slid in the Y direction, and the first and second cam surfaces thereof are slid. Two guide shafts 1 elastically pressed against the cam surfaces 19 and 20 by preload springs 26, respectively.
The other ends 15b and 16b of the motors 5 and 16 are driven up and down in the Z direction, which is the vertical direction, by the same vertical movement amount. That is, one ends 15a and 16a of the two guide shafts 15 and 16 are the chassis 1
4 is pivotally supported by two fulcrums 17 and the other end 15
Since the vertical guide grooves 25b of the two guide members 25 guide the positions in the vicinity of b and 16b so as to be able to move up and down in the Z direction, as shown by the alternate long and short dash line in FIG.
Is slid from the reference position indicated by the solid line in the x1 direction, the other ends 15b and 16b of the two guide shafts 15 and 16 are moved downward by the first and second cam surfaces 19 and 20 against the preload spring 26. The same descending amount S is applied in the z1 direction. On the contrary, when the slide cam 18 is slid from the reference position shown by the solid line in the opposite direction of the arrow x2, the two guide shafts 15 follow the first and second cam surfaces 19 and 20. 16 other end 15b, 1
6b are respectively moved upward by the preload spring 26 in the upward z2 direction by the same amount S.

As a result, as shown in FIG. 8, the two guide shafts 15 and 16 are in the vertical direction on the chassis 14 with the fulcrum 17 as the center, and the combined direction of the X and Z directions is XZ. The tilt is adjusted at the same angle in each direction. At this time, a twist occurs between the engaging portion 31 of the thread 24 and the spiral groove 30a of the lead screw 30, which can be absorbed by pressing the engaging portion 31 against the lead screw 30 by the preload spring 31a. . Then, the optical axis F of the light beam OB emitted from the optical pickup 23 mounted on the sled 24 which is guided by these two guide shafts 15 and 16 and travels in the X direction has the optical axis F of the signal surface 13 a of the optical disc 13. Following the inclination in the vertical direction, the radial skew is controlled so as to be perpendicular to the signal surface 13a.

The skew operation described above is performed as an initial setting before recording or reproducing on the optical disk 13 based on the detection result of the reflection type skew sensor 32.
Even during the recording or reproduction, if the reflection-type skew sensor 32 detects the tilt of the optical disc 13, it is performed based on the detection result. By performing this skew servo, the optical axis F of the light beam OB is detected. Can always be maintained and corrected in a state perpendicular to the signal surface 13a of the optical disc 13, and remarkably improve the performance of recording and / or reproducing (so-called reading and writing) of data with respect to the high-density optical disc 13 such as a DVD. You can

(3) Description of Disk Shape Measuring Mechanism Next, the shape measuring mechanism M3 of the optical disk 13 will be described with reference to FIGS. 9 to 14. Here, the shape of the optical disk 13 is shown in FIG. 8c which is a circular disc shown
An optical disc 13A such as an mCD or a 12 cm CD, and FIG.
Card type optical disk 13B which is a non-circular disk shown in FIG.
And a shape not belonging to these is referred to as a modified optical disk. Then, several kinds of optical disks 13A and 13B having different shapes are selectively placed horizontally in the disk positioning recess 12a of the disk tray 12 shown in FIG.
2 by the arrow a in the optical disk drive body 11
It is configured to be selectively loaded in the direction and to be selectively mounted horizontally on the turntable 27a of the spindle motor 27 as described above.

FIG. 13 shows an outline of a control circuit of the disk shape measuring mechanism M3, in which several kinds of optical disks 13A and 13B having different shapes are selectively mounted on one turntable 27a. The disc mounting detection sensor 51, which is a disc mounting detection unit that detects that the optical disc 13 has been inserted into the optical disc drive apparatus main body 11 by the disc tray 12 described above.
It is composed of a sensor that detects the completion of loading of A and 13B. The disk mounting detection sensor 51, the reflection type skew sensor 32 of the skew servo mechanism M1 and the skew servo circuit 52 described above are a central control circuit CPU (microcomputer) 5
Connected to 3. Then, the CPU 53 moves the turntable drive circuit 55, which is a means for controlling the rotation of the turntable 27a by the spindle motor 27, and the sled motor 28, to move the reflection type skew sensor 32 to a measurement point corresponding to the outer periphery of the optical disks 13A, 13B. It is configured to control the sled drive circuit 55 which is a means for controlling.

Then, the thread 2 of the optical pickup 23
As described above, the reflection-type skew sensor 32 mounted on the No. 4 is composed of one light emitting element 32a and two light receiving elements 32b and 32c, and is provided on the signal surface 13a of the optical disks 13A and 13B. Three light emitting elements 3
The reflected light RL of the detection light DL emitted from 2a is received (detected) by the two light receiving elements 32b and 32c, and the optical disc 1 is detected by the difference in the amount of light received by the two light receiving elements 32b and 32c.
The amount of tilt in the radial direction of 3A, 13B, etc. and the tilt direction are simultaneously detected.

On the other hand, the reflectance of the detection light by the signal surface 13a of the optical discs 13A, 13B can be detected by the sum of the amounts of light received by the two light receiving elements 32b, 32c.
The sum of the received light amounts is shown in FIG. 1 (B), FIG. 2 (B), and FIG.
Since it is "1" or "0" as shown in (B), the optical discs 13A and 13B are calculated by the sum of the received light amounts.
It is possible to detect the presence or absence of etc. Information (identification pattern) for identifying the card-type optical disc 13b among the shape patterns of the optical discs 13A and 13B detected by the sum of the amount of light received by the reflection-type skew sensor 32.
Are stored in advance in the memory circuit 53a in the CPU 53.

Here, the control operation of the shape measuring mechanism M3 configured as described above will be described with reference to FIGS.
This will be described with reference to the flowchart of FIG. First, Fig. 1
As shown in FIG. 2, it is detected that the optical disks 13A and 13B are selectively mounted on the turntable 27a of the spindle motor 27, and the operation is started. And in FIG.
The sled motor 28 is driven by the control signal output from the CPU 53 shown in FIG.
As shown by the solid line in FIG. 12, the sled 24 of the optical pickup 23 is slid in the X direction, which is the radial direction of the optical discs 13A and 13B, and the reflection type skew sensor 32 is first shown in FIGS. , An optical disk 13A-which is an 8 cm CD shown by a solid line in FIG.
The first measurement point P1 set in the vicinity of the outer circumference 13b of No. 1
CPU shown in FIG. 13 after being moved to (S001)
The turntable 2 of the spindle motor 27 is controlled by a control signal output from the turntable drive circuit 54 to the turntable drive circuit 54.
7a is rotationally driven in the R direction (S002) at a low speed (being slower than that during recording and / or reproduction).

Then, as shown in FIG. 13, one of the optical disks 13A and 13B by the reflection type skew sensor 32 is used.
A second shape measurement is performed. That is, from one light receiving element 32a of the reflection type skew sensor 32 to the optical disk 13
The reflection RL of the detection light DL irradiated onto the signal surfaces 13a of A and 13B is received (detected) by the two light receiving elements 32b and 32c, and the sum of the light receiving amounts of the two light receiving elements 32b and 32c is measured. Light intensity measurement of light RL (S00
3) is performed. At this time, as shown in FIG. 11, when the optical disk 13 is not mounted on the turntable 27a, even if the turntable 27a is rotated once, the two light receiving elements 32b, 3b of the reflection type skew sensor 32 are provided.
2c cannot detect the reflected light RL at all and measures "no light amount" (S004), so "no disk"
(S005).

On the other hand, the optical disk 13 mounted on the turntable 27a is the card type optical disk 1 shown in FIG.
In the case of 3B, when the card type optical disk 13B is rotated once by the turntable 27a, (A) of FIG.
As shown in FIG. 2, when the card type optical disk 13B is rotated once at a low speed in the R direction, two points of the reflection type skew sensor 32 are displaced each time the measurement point P1 deviates from the outer circumference 13b of the card type optical disk 13B to both sides 13c. Light receiving element 32
The amount of light received by b and 32c changes from "1" to "0". Therefore, as shown in FIG. 10B, the two light receiving elements 32b and 3b during one rotation of the card type optical disk 13B.
The pattern of measurement of the amount of received light of 2c is "1" and "0"
The pattern repeats once, and "the light amount changes in one round" is measured (S006). Then, the measurement of the amount of received light measured by the reflection type skew sensor 32 is C in FIG.
Whether or not it is the same as the identification pattern of the card type optical disc previously stored in the memory circuit 53a of the PU 53 is discriminated (S007), and if it is the same pattern, the optical disc 13 mounted on the turntable 27a. Is "card type optical disk 13B" (S00
8), and if it is any other pattern, it is determined to be a deformed disc (S009).

If the optical disk 13 mounted on the turntable 27a is an 8 cm CD 13A-1 shown in FIG. 9, two light receiving elements of the reflection type skew sensor 32 at the measuring point P1 during one rotation of the 8 cm CD 13A-1. Since the sum of the light receiving amounts of 32b and 32c is constant at "1", "constant light amount" is measured (S010).
Then, at this time, the sled motor 28 is driven by the control signal output from the CPU 53 shown in FIG. 13 to the sled drive circuit 55, and the sled 24 of the optical pickup 23 is moved in the X direction as indicated by the one-dot chain line in FIG. The reflective skew sensor 32 is slid to
After being moved (S011) to the second measurement point P2 set near the outer circumference of the cmCD 13A-2, the turntable of the spindle motor 27 is controlled by the control signal output from the CPU 53 to the turntable drive circuit 54 shown in FIG. 27a is rotationally driven again at low speed (S012).

Then, after that, the light quantity measurement of the reflected light RL (S013), which is the second shape measurement of the 8 cm CD13A-1 by the reflection type skew sensor 32, is performed in the same manner as the first time. Then, "no light intensity" is measured (S01
4) Then, it is determined that the optical disc 13 mounted on the turntable 27a is "8 cm CD13A-1" (S015).

On the other hand, if the optical disk 13 mounted on the turntable 27a is a 12 cm CD13A-2, the two light receiving elements 32b, 3b of the reflection type skew sensor 32 during one rotation of the 12cm CD13A-2.
Since the sum of the amount of light received by 2c is constant at "1",
"Constant amount of light" is measured (S016), and the optical disk 13 mounted on the turntable 27a shows "12c".
It is mCD13A-2 ”(S017).
It should be noted that here, "the amount of light changes during one rotation" in which the sum of the amounts of light received by the two light receiving elements 32b and 32c of the reflection type skew sensor 32 changes during one rotation of the optical disk 13 was measured (S018). In this case, it is determined that the optical disc 13 mounted on the turntable 27a is a "variant disc" different from the card type optical disc 13B (S01).
9) will be done.

The 8 cm CD 13A-1, 12 cm CD selectively mounted on the turntable 27a
13B-1 and the card type optical disc 13B, the CPU 53 of FIG.
Are driven to rotate at a rotation speed corresponding to each optical disk 13, and data is recorded and / or recorded on these optical disks 13.
Or, it will be played back. In particular, with respect to the card type optical disk 13B, the number of rotations is decreased, the servo constant is changed to an optimum value, and the like, so that data can be recorded and / or reproduced on the card type optical disk 13B.
Even when the card type optical disc 13B is mounted, the optical disc drive device 10 can be stably operated. Further, the card type optical disc 13B and other odd-shaped discs are ejected to the outside of the optical disc drive apparatus main body 11 by the disc tray 12, so that the 8 cm CD 13A-1 and the 12 cm CD 13A-2 are produced.
It is also possible to ensure stable operation of the optical disk drive device 10 with respect to.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the technical idea of the present invention.

[0041]

The disk drive device of the present invention configured as described above can achieve the following effects.

According to a first aspect of the present invention, when one of several kinds of disks having different shapes is selectively mounted on the turntable, the reflection type skew sensor of the skew servo mechanism is moved to a measuring point corresponding to the vicinity of the outer circumference of the disk. Then, the turntable is rotatably driven at a low speed, and the detection light of the reflection type skew sensor is irradiated onto and reflected from the signal surface of the disk to receive the light. Since the disc is selectively discriminated by the disc, it is possible to easily discriminate whether the disc selectively mounted on the turntable is circular or non-circular. Therefore, for a non-circular disk such as a card-type disk, the number of rotations may be reduced, the servo constant may be changed, or the non-circular disk may be ejected to the outside of the disk drive device. The device can be operated stably. And since the reflection type skew sensor of the skew servo mechanism also serves as the sensor for measuring the shape of the disk,
It is possible to provide a low-cost disk drive device by reducing the number of parts and the number of assembly steps.

According to the second aspect of the present invention, at least the number of revolutions of the disk and the servo constant are changed based on the shape measurement of the disk by the reflection type skew sensor. Therefore, a non-circular disk such as a card type disk is the same as a circular disk. It is possible to provide a disc drive device capable of recording and / or reproducing data.

A third aspect of the present invention is a reflection type skew sensor,
Since the inclination of the signal surface of the disk is detected by the difference in the amount of light received by the two light receiving elements, and the shape of the disk is detected by the sum of the amounts of light received by the two light receiving elements, the disk shape measurement and skew servo are performed. It can be performed independently of each other with high precision.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of an optical disk drive device to which the present invention is applied.

FIG. 2 is a perspective view of the entire skew servo mechanism for explaining the skew servo mechanism applied to the optical disk drive device of the present invention.

FIG. 3 is a perspective view showing a chassis on which the skew servo mechanism shown in FIG. 2 is mounted and a sled driving mechanism.

FIG. 4 is a perspective view of only the skew servo mechanism shown in FIG.

5 is a plan view of the entire skew servo mechanism shown in FIG. 2. FIG.

FIG. 6 is a perspective view showing a fulcrum portion at one end of the two guide shafts shown in FIG.

FIG. 7 is a view taken along the line AA in FIG. 5 for explaining the elevating and lowering drive procedure in the Z direction of the other ends of the two guide shafts by the first and second cam surfaces of the slide cam shown in FIG. It is a partial notch expansion front view.

8 is a B-section of FIG. 5 for explaining a pivotal drive procedure in the Z direction about a fulcrum portion at one end of two guide shafts by the first and second cam surfaces of the slide cam shown in FIG. It is a partially notched enlarged side view in the B arrow direction.

FIG. 9 is a diagram illustrating a shape measurement state and a received light amount pattern by a reflection type skew sensor when an 8 cm CD is mounted on a turntable of an optical disk drive device to which the present invention is applied.

FIG. 10 shows a shape measurement by a reflection type skew sensor when a card type optical disk is mounted on a turntable of an optical disk drive device to which the present invention is applied,
It is drawing explaining the pattern of the amount of received light.

FIG. 11 is a diagram illustrating a shape measurement by a reflection type skew sensor when an optical disc is not mounted on a turntable of an optical disc drive apparatus to which the present invention is applied, and a pattern of received light amount.

FIG. 12 is a side view illustrating the operation of the optical disc shape measuring mechanism of the optical disc drive device to which the present invention is applied.

13 is a block diagram showing an outline of a control circuit of the shape measuring mechanism of the optical disc shown in FIG.

FIG. 14 is a flowchart illustrating how the shape of an optical disc is measured based on the control circuit shown in FIG.

[Explanation of symbols]

Reference numeral 10 is an optical disc drive device which is a disc drive device, 12 is a disc tray, 13 is an optical disc which is a disc, 13a is a signal surface of the optical disc, 13A-1 is 8 cm CD, 13A-2 is 12 cm CD, 13B is a card type optical disc, and 21 is Objective lens, 23 is an optical pickup, 24 is a thread, 25 is a guide member, 25b is a guide groove of the guide member, 26 is a pressurizing spring, 27 is a spindle motor, 27a is a turntable of the spindle motor, and 32 is a skew detecting means. A reflection type skew sensor, 32a is a light emitting element of the skew sensor, 32b,
32c is a light receiving element of a skew sensor, 38 is a sled motor, M1 is a skew servo mechanism, M2 is a sled drive mechanism, M3 is a shape measuring mechanism, 51 is a disk mounting detection sensor, 52 is a skew servo circuit, 53 is a CPU,
Reference numeral 53a is a CPU memory circuit, 54 is a turntable drive circuit, and 55 is a thread drive circuit.

Claims (3)

[Claims] 1. An optical pickup for recording and / or reproducing data on the disc by converging a light beam by an objective lens on a signal surface of the disc which is mounted on a turntable and rotationally driven, and mounted on the optical pickup. And a skew servo mechanism that detects the tilt of the signal surface of the disk by a reflective skew sensor and corrects the optical axis of the light beam of the objective lens with respect to the signal surface of the disk. Disc mounting detection configured to selectively mount several kinds of disks having different shapes on the table, and detecting that one of the several kinds of disks having different shapes is selectively mounted on the turntable And a reflection type scan based on the detection of the disc mounting by the disc mounting detection means. Means for moving the fuse sensor to a measurement point corresponding to the vicinity of the outer circumference of the disc, and rotationally driving the turntable at low speed, and irradiating the signal light of the disc with the detection light of the reflection type skew sensor moved to the measurement point. And a means for discriminating the shape of the disk by receiving the reflected light and discriminating the shape of the disk by a pattern of the amount of light received by the reflection type skew sensor. 2. The disk drive device according to claim 1, further comprising a control circuit for changing a rotation speed and a servo constant of the disk based on the shape measurement of the disk by the reflection type skew sensor. . 3. The reflection type skew sensor is configured so that the detection light emitted from one light emitting element is reflected by the signal surface of the disk and is received by two light receiving elements. 2. The structure is configured to detect the inclination of the signal surface of the disc based on the difference in the amount of received light, and to detect the shape of the disc based on the sum of the amounts of received light of the two light receiving elements.
The disk drive device described in 1.