JP2000311358A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect an optical disk and a disk rotary-driving motor with each other by moving the disk rotary motor toward the optical disk. SOLUTION: In this optical disk device, by a vertical moving motor 280, an elevation block 273 having a spindle motor 204 fixed thereto is moved near a disk 242 along a shaft 274. After the elevation block 273 reaches a specified position, the specified position of the elevation block 273 by a position detector composed of a reflecting member 282 and a photoreflector 282, and then the rotary-driving of the spindle motor 204 is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device.

[0002]

2. Description of the Related Art For example, Japanese Patent Laying-Open No. 4-351785 (Document 1) describes a device for connecting a disk and a spindle motor by moving a member to which a spindle motor is fixed so as to be close to the disk by an elevating motor. ing. A similar technique is described in Japanese Patent Application Laid-Open No. 4-321972 (Document 2).

[0003]

The apparatus disclosed in the above-mentioned document 1 or 2 does not have a position detector for detecting a state in which a member to which the spindle motor is fixed has reached a predetermined position. Since there is no control device (control circuit) for starting the rotation of the spindle motor after the detection by the detector, the reliability of the connection between the disk and the spindle motor cannot be expected. High reliability cannot be expected at least for reading information on a recording medium with an optical head. An object of the present invention is to provide a highly reliable apparatus for reading at least information on a disk-shaped recording medium with an optical head. As a conventional technique other than the above-mentioned documents 1 and 2, Japanese Patent Application Laid-Open
JP-A-232567, JP-A-64-89068, JP-A-5-242579, JP-A-5-298
No. 799.

[0004]

According to a first aspect of the present invention, there is provided an optical disk apparatus for transmitting information from a disk-shaped recording medium on which information is recorded to an optical head (an "optical head" is a device that converges light onto a disk-shaped recording medium). In order to at least read at least the optical element to be irradiated), a movable member fixed to a disk rotation motor moves toward a predetermined position so as to approach the disk-shaped recording medium, and In an optical disk device configured to be coupled to the disk rotation motor (if the disk-shaped recording medium is in a state of normal rotation when the disk rotation motor is driven to rotate, this corresponds to “coupling”). When starting, set the carriage so that the carriage on which the optical head is arranged is located on the innermost circumference. A moving mechanism configured to move the movable member to an inner periphery, a position detector that detects a state in which the movable member has reached the predetermined position, and a position detector that detects a state in which the movable member has reached the predetermined position. And a control circuit for starting the rotation of the disk rotation motor after the detection by the disk drive. Claim 2
In the optical disc apparatus of the present invention, the focus search is started by a relative movement between the disc-shaped recording medium and a lens arranged in the optical head in a state where the movable member has reached the predetermined position. It is characterized by having been done. An optical disk device according to a third aspect of the present invention is the optical disk device according to the first aspect, wherein the lifting / lowering motor moves the movable member to the predetermined position.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the optical disk device according to the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the structure of a spindle motor. In this embodiment, a mechanism for supporting the magneto-optical disk cartridge by a driving device that raises and lowers the motor is employed. FIG. 2 shows an example of the configuration of the separation optical system and the configuration of the circuit of the focus control system.

In FIG. 1, reference numeral 201 denotes a main body. Body 201
On the upper side, a spindle motor 204 as a disk rotation motor, which is a drive unit of a disk drive device for rotating the magneto-optical disk 242 in the disk cartridge 251, moves up and down via a lifting block 273 corresponding to a movable member. It is arranged as possible. An electromagnet 271 controlled to be energized is attached to the upper surface of the spindle motor 204. The electromagnet 271 is worn by contacting with a permanent magnet 272 described below disposed above the electromagnet 271.
The surface is covered with plastic to prevent disconnection. The spindle motor 204 includes a lifting block 273
Are fixed by screws or the like (not shown).

The elevating block 273 is provided with a through hole 273a composed of a plurality of bearings. By inserting a guide shaft 274 fixed on the main body 201 into the through hole 273a, the elevating block 273 moves along the guide shaft 274. And is supported so as to be movable in the vertical direction (direction of contact and separation with respect to the main body 201). At least three protrusions 276 protrude from the upper surface of the elevating block 273 around the spindle cup 275. When the lifting block 273 is raised, each protrusion 276
Abuts on a cartridge positioning recess formed on the lower surface of the cartridge 251. The surface on which the cartridge 251 is supported by the tips of the protrusions 276 is parallel to the surface on which the magneto-optical disk hub 277 is mounted on the surface of the spindle cup 275, and is located on the main body 201 side.

A rack 278 corresponding to a movable member is fixed to a side surface of the lifting block 273. The gear 279 meshing with the rack 278 is fixed to the shaft of the lifting motor 280 (see FIG. 1). With such a mechanism, the lifting block 273 (therefore, the spindle motor 204 attached to the lifting block 273) can be moved up and down by the lifting motor 280 when the lifting motor is driven. The lifting block 273 and the main body 2
A compression coil spring 281 is interposed on the outer circumference of the guide shaft 274 between the first and second shafts 01 and 01, and the lifting block 273 is urged upward by the compression coil spring 281. As a result, the compression coil spring 28
Due to the action of the elastic force (restoring force) of 1, the tooth surface of the gear 279 and the tooth surface of the rack 278 are in a pressed state (a state in which they are pressed against each other).

A reflection member 282 is attached to the lower surface of the spindle motor 204 by bonding.
The reflecting member 282 may have a configuration in which, for example, a metal thin film is coated on glass, and a reflecting surface for incident light has a wedge shape. A photoreflector 283 is attached to a reflection member 282 provided on the lower surface portion of the spindle motor, by bonding on a facing surface of the main body 201 facing the reflection member 282. The photoreflector 283 may be a known one. For example, a photoreflector 283 having a configuration in which an LED as a light emitting element and a light receiving element including a two-part photodetector can be used.

The magneto-optical disk 2 in the cartridge 251
Reference numeral 42 has a disk hub 277 made of a magnetic material and attached to the center thereof by bonding or the like. This hub 277
When the magneto-optical disk 242 is placed on the spindle cup 275, the yoke 284 in the spindle cup 275
And a magnetic circuit composed of the permanent magnet 285 and the magneto-optical disk 242.
Is clamped on the surface of the turntable of the spindle cup 275 corresponding to the turntable.

In this embodiment, the spindle motor 204
And the turntable for mounting the disk 242 can be independently driven along the direction of the spindle motor shaft 288. The focus search (focus pull-in) and the focus control can be performed by moving the staple cup 275 up and down along the motor shaft 288 (therefore, without moving up and down including the elevating block 273 itself). . For this reason, the spindle cup 275 is fitted with a key 289 inserted therein to prevent rotation with respect to the spindle motor shaft 288, whereby the spindle cup 275 is connected to the spindle motor shaft 28.
8 so that the spindle cup 275 can move vertically with respect to the spindle motor shaft 288. Further, as a driving mechanism for moving the turntable up and down, a permanent magnet 272 is adhered to the lower surface of the spindle cup 275 so as to face the electromagnet 271 fixed to the upper surface of the spindle motor 204. The permanent magnet 272 forms a vertical drive mechanism separate from the vertical block drive mechanism.

The center of the spindle cup 275 is fitted with the spindle motor shaft 288, but the periphery thereof is concave. The bottom of the concave portion and the tip of the spindle motor shaft 288 have screws or the like. Between the compression coil spring 28 and the stopper 286 fixed by
7 is interposed. By the compression coil spring 287, the spindle cup 275 is urged downward with respect to the spindle motor shaft 288.

As shown in FIG. 2, the main body 201 is provided with an optical pickup device including a fixed optical block portion 202 and an objective lens driving device portion 203 at a position lateral to the spindle motor 204. This optical pickup device corresponding to an optical head includes a magneto-optical disk 24 mounted and mounted on a turntable 241 of a spindle motor 204.
2 is irradiated with a light beam for writing and reading an information signal.

The fixed optical block section 202 includes a semiconductor laser 221 as a light source and an optical device for guiding a light beam emitted from the semiconductor laser 221. That is, when the irradiation by the semiconductor laser 221 is performed in the fixed optical block unit 202, the light beam emitted from the semiconductor laser 221 is:
The light enters the collimator lens 222 and is converted into a parallel light beam by the collimator lens 222. The parallel light beam transmitted through the collimator lens 222 is split by a prism 230 including a first beam splitter 231 and a second beam splitter 232. The light partially reflected by the first beam splitter 231 is guided to a first photodetector 224 that receives the light. The output obtained from the photodetector 224 is sent to an APC circuit 225 for keeping the amount of light emitted from the semiconductor laser 221 constant, and a control device (CP) corresponding to a control circuit.
U) 207 is provided as a control input.

The circuit of the focus control system includes, in addition to the control device 207, a drive circuit 206 for focus control and focus search, and a switch SW which is provided in connection therewith and which can be switched. Control device 2
07, the output SPDP of the photoreflector 283 and the spindle motor 204 are used to start the focus search or the focus control based on both the detection output of the rotation detection of the magneto-optical disk 242 and the detection of the elevation position of the spindle motor 204. The output SPFD of an encoder (not shown) accompanying the rotation of the switch SW can be input as a control input, and the switching control of the switch SW is performed by the output obtained from the control device 207.
The coil L of the electromagnet 271 in the drive mechanism for moving the turntable 241 up and down is connected to the drive circuit 206 in FIG.

In the fixed optical block 202, while the reflected light is received by the photodetector 224 as described above, a parallel light beam transmitted through the prism 230 is emitted from the fixed optical block 202 and The light enters the lens driving device 203.

The objective lens driving device 203 has a carriage 233 that moves on the main body 201 so as to drive the objective lens in the radial direction of a magneto-optical disk 242 (hereinafter, referred to as a disk). The specific configuration of the carriage 233 can be, for example, as follows.

As shown in the arrangement diagram of FIG. 3 and the exploded perspective view of FIG.
The carriage main body 233 (B) and other movable parts can move in the radial direction of the disk 242 along a slide guide 233 (A) including a long fixing member 342 fixed to the disc 01 and a retainer 343. It is configured to be.

The carriage main body 233 (B) is formed of a plate-like body, and is inserted between the upper side coil section 337U and the lower side coil section 337D of the access coil 337 which is a coil formed in a concave shape. , Access coil 33
Combined with 7. This carriage body 233
The lower coil portion 337D of the access coil 337 is provided for the lower surface portion 233a and the upper surface portion 233b on both sides of FIG.
The upper coil portion 337U is bonded and fixed, and the carriage body portion 233 (B) and the access coil 337 are integrated.

The reflection prism 332 is bonded and fixed to one end 233c of the carriage main body 233 (B). The reflection prism 332 and one end 233 c of the carriage body are inserted into the lens holder through the opening of the lens holder 334, and the reflection prism 332 faces the objective lens 333 inside the lens holder 334. The fitting part 344a of the support base 344 is fitted and bonded to the other end 233d of the carriage main body 233 (B). Thus, the support 344 is attached to the carriage main body 233 (B).

The support 344 is provided with a slide guide 233.
An escape portion 344b for the movable portion 341 shown in FIG. 11A is formed at a lower portion, and has a through hole 344c for a light beam from the fixed optical block portion 202. Support table 34
Four plate-like spring portions 336 for supporting the lens holder 334 are provided at four positions of the stepped upper surface 344d and the lower surface 344e, respectively.
Is attached by bonding. Leaf spring part 33
Reference numeral 6 denotes four leaf springs 336a to 336 extending in the horizontal direction.
6d. These four leaf springs 336a-33
The front end of 6d is fixed to the front end side of the lens holder 334, so that the lens holder 334 is supported as shown in FIG.

The lens holder 334 in which the objective lens 333 is bonded to the upper wall has a shape in which the front and rear walls and a part of the lower wall are opened, and a tracking coil 335 is bonded and fixed to the peripheral surface. The lens holder 334 has two side walls, each of which has a permanent magnet 338 and a magnetic yoke 34 on both sides, similarly to the side coil portions of the access coil 337.
It is combined with the magnetic circuit of the linear motor so as to be arranged in the gap 337 with 0 (inner yoke). Therefore,
As shown in FIG. 3, the integrated access coil 3
37, the movable portion including the carriage body 233 (B), the support base 344, etc., and the lens holder 334 are in such a state that the upper wall, side wall and lower wall of the lens holder 334 partially embrace the magnetic yokes 340 on both sides. Then, in a state where the concave access coil 337 wraps the magnetic yokes 340 on both sides, it moves linearly in the radial direction of the disk 242 along the magnetic yoke 340.

The lens holder 334 is supported by holding the reflecting prism 332 and one end 233c of the carriage body in the lens holder.
6d, the leaf springs 336a to 336d are partially attached to the carriage main body 2a.
There are provided telescopic portions 336e to 336h that can expand and contract in the moving direction of 33 (B), and thus in the radial direction of the disk 242. The elastic portions 336e to 336h can be made of, for example, superfine wires that intersect each other like stitches and rubber that covers the wires. When the lens holder 334 moves in the tracking direction, when the lens holder 334 moves
336h expands and contracts in a plane parallel to the paper surface in FIG. The lens holder 334 is supported by the support structure having such elastic portions 336e to 336h.
In the assembled state as shown in FIG. 3, the disk 242 can be further moved in the radial direction within the expansion and contraction range of the expansion and contraction portion.

The guide to the carriage main body 233 (B) by the slide guide 233 (A) installed on the apparatus main body 201 is performed via an intermediate member 345 shown in FIG. That is, on the lower surface 233a of the carriage main body 233 (B), a stepped front and rear of the intermediate member 345 is sandwiched between the lower surface of the carriage main body and the intermediate member so as to sandwich the lower coil portion 337D of the access coil 337. Upper surface 34
5a is adhered, and the concave portion of the lower surface 345b of the intermediate member 345 is fixed to the fixing member 34 of the slide guide 233 (A).
2 is adhered to the movable part 341 that slides on the upper part. The permanent magnet 338 and the U-shaped magnetic yoke 339 (outer yoke) disposed on the surfaces of the access coil 337 and the tracking coil 335 of the lens holder 334 facing each other are also the main body 20.
Fixed to 1. Magnetic yoke 340 as inner yoke
Is attached to the end of the magnetic yoke 339.

The objective lens driving device 2 having the above configuration
03, when the access coil 337 is energized, along the fixing member 342 of the slide guide 233 (A),
The carriage body 233 (B) moves in the radial direction of the disk 242 integrally with the movable part 341. At this time, the coil side portions of the access coil 337, which is the movable side, and the inner surfaces 334a and 334 of the wall portion of the lens holder 334.
b and the like are the gap 337a between the permanent magnet 338 and the magnetic yoke 340 and the gap 3 between the coil side and the magnetic yoke 340.
Since the dimensions such as 37a are set at predetermined intervals so as not to contact the fixed side, the permanent magnet
Does not come into contact with magnetic circuits containing Further, the lens holder 334 holding the objective lens 333 may be supported by the support mechanism so as to be movable in the radial direction of the disk, and the movable member on the side of the carriage main body 233 (B) which moves in the radial direction of the disk 242 may be provided. No permanent magnet is mounted on the objective lens driving device for driving the objective lens in the optical axis direction (focus direction).
Therefore, the device is lightened accordingly. In addition, manufacturing is simple, man-hours can be reduced, and assembly is easy.

As for tracking, after a focus control operation is executed based on a tracking error signal output from a photodetector 264 (FIG. 2) described later,
Tracking coil 3 via tracking drive circuit
This is performed by energizing 35. In this case, when the tracking coil 335 is energized, the lens holder 334 moves in the radial direction of the disk 242. When the tracking coil 335 is energized, the lens holder 334 has a support structure having telescopic portions 336e to 336h. The plate spring portion 336 restores the initial position.

The objective lens driving device 203 shown in FIG. 2 can be configured as described above. Returning to FIG.
The parallel light beam from the fixed optical block unit 202 is reflected by the reflection prism 332 of the carriage 233 and is incident on the objective lens 333 to be a focused light beam. This light beam is emitted from the objective lens 333 and reflected by the disk 242 mounted on the turntable 241, again enters the objective lens 333 and becomes a parallel light beam.
The light is reflected at 2 and returns to the fixed optical block section 202.

The parallel light beam returned to the fixed optical block section 202 is guided to a light detection optical system. That is, the returned parallel light beam is reflected by the second beam splitter 232 and transmitted through the λ / 2 plate 261 so that the polarization plane becomes 4.
After being rotated by 5 degrees, the light is further focused by the condenser lens 262 and enters the polarization beam splitter 263 as an analyzer. The polarization beam splitter 263 allows the P
The polarized light component is transmitted and emitted from the polarization beam splitter 263, and the S-polarized light component is reflected so as to be separated from the P-polarized light component, emitted from the polarization beam splitter 263, and received by the respective photodetectors 264.

The output of the photodetector 264 provides a focus error signal indicating the amount of shift in the optical axis direction between the focal point of the light beam focused by the objective lens 333 and the recording information surface of the disk 242, and the focus error signal. Light spot and disk 24
2 and a signal for reading information recorded on the track of the disk 242 can be obtained. Here, the magnetic head 205 is mounted on the main body 201 or the carriage 233.
It is supported via a support arm (not shown) provided above. The magnetic head 205 has an objective lens 333
Are attached at positions facing each other with the disk 242 interposed therebetween, and are used for applying an external magnetic field for writing when an information signal is written on the disk 242.

A drive circuit 206 to which a focus error signal obtained as an output of the photodetector 264 is supplied via a switch SW is provided with a focus control (FO) in the illustrated example.
D) Unit 206a and Focus Search (FOS) Unit 206
b. The focus error signal based on the output of the photodetector 264 is provided to the drive circuit 206 via a switch SW controlled to be switched by the control device 207.

The coil L of the electromagnet 271 disposed on the spindle motor 204 is energized and controlled through the drive circuit 206. The repulsive force of the permanent magnet 272 adhered and fixed to the turntable 241 on which the disk 242 is disposed causes the coil L of the disk 242 to rotate. When it is desired to move the recording information surface away from the objective lens 333 of the carriage 233, the power is increased and the repulsive force is increased.

In this embodiment, the control device 207 (FIG. 2) shown in FIG. 2 is used not only for controlling the focus control system but also for controlling the elevating motor 280 shown in FIG.

Next, the operation of the apparatus according to the present embodiment having the above-described structure will be described. In FIG.
A cartridge holder (not shown) into which the cartridge 251 is inserted is provided on the cartridge 01. Such a cartridge holder and a loading mechanism that operates in conjunction with the inserted cartridge side may be the same as known ones.

For example, similarly to the recording / reproducing apparatus in the above-mentioned document 1, the front part and the rear part of the cartridge holder are opened, and the cartridge 251 is disc-shaped as in the configuration shown in FIGS. 242 is rotatably housed in the cartridge 251. In addition, a cartridge holder (not shown, see the cartridge holder 28 of the above-mentioned document 1) can be inserted with the cartridge 251 being parallel to the main body 201. That is, when the cartridge 251 is inserted into the cartridge holder, the movement of the cartridge 251 causes the shutter release pin on the cartridge holder side to press the shutter member on the cartridge 251 side, whereby the shutter member operates and the recording / reproducing opening of the cartridge 251 is opened. And the front edge portion of the cartridge 251 is passed between the objective lens and the magnetic head device. In this way,
The disk 242 is inserted between the objective lens and the magnetic head device.

When the cartridge 251 is inserted up to a predetermined insertion completion position, this is detected by a detection device (not shown), and the detection signal is sent to the control device (CPU) 207.
(FIG. 2), and the control device 207 drives the elevating motor 280 based on this.

The gear 279 is driven by the drive of the lifting motor 280.
The lifting block 273 rises from the initial position (down position) via the rack 278. When the lifting block 273 moves up and approaches the cartridge 251, the disk 2
The hub 277 is mounted on the surface of the turntable 241 of the spindle cup 275 by the attraction force of the clamping permanent magnet 285, and the cartridge 251 has its cartridge positioning recess abutted on the projection 276 on the top of the elevating block 273. (FIG. 1). At this time, since the spindle cup 275 is urged by the compression coil spring 287, the disc magnet 2 is kept in contact with the electromagnet 271 and the permanent magnet 272 by the spring force.
42 hub 277 is clamped to spindle cup 275. Therefore, the positions of the electromagnet 271 and the permanent magnet 272 are determined in advance to be a predetermined position in order to provide a necessary gap between the lower surface of the inner wall of the cartridge 251 and the disk 242.

When the spindle motor 204 is driven from the above state, the disk 242 is rotated together with the spindle cup 275. At this time, the above-mentioned rotary encoder (not shown) is directly connected to the spindle motor shaft 288 of the spindle motor 204, and the output from the rotary encoder is subjected to FV conversion and supplied to the control device 207.

By the way, the lifting block 2 as described above
In the ascending process of 73, when the elevating block 273 moves up, the light beam emitted from the LED of the photo reflector 283 is reflected by the reflecting member 282, and the reflected light is received by the two-part photodetector of the photo reflector 283. Then, since the light beam shifts on the surface of the light receiving element, the position of the lifting block 273 can be detected by the difference output of the two divided photodetectors. In a state where the position of the lifting block 273 is detected by the photodetector, the lifting block 273 is arranged at a predetermined position in the disk device as shown in FIG.

Further, when the disk 242 rotates,
When the carriage 233 is located at the innermost circumference (assuming the rotation centerline when the disk 242 rotates, the position of the carriage when the carriage 233 comes closest to the rotation centerline within the range in which the carriage 233 can move is determined. To tell)
After being moved to, irradiation by the semiconductor laser 221 is performed. If a light beam is emitted from the semiconductor laser 221, the output from the photodetector 224 constituting the front monitor is the control input to the control device 207. Therefore, this is detected by the control device 207. After recognizing the above state, the control device 207 instructs the focus search and the focus control to operate.

In this embodiment, the focus search and the focus control are started under the control of the control device 207 at such timing. That is, the cartridge 25
1 is detected to be inserted into the apparatus, and the lift motor 2
80 operates, the spindle motor 204 rises and the disk 242 is mounted on the turntable 241, and then the spindle motor 204 rotates the spindle motor shaft 288 and the disk 242 at a constant rotation speed (for example,
(3600 rpm).

In the focus control circuit, when these states are completed, that is, when the lifting block 273 moves up, the photodetector 283 of the photoreflector 283 is turned on.
a, the output SPDP of the encoder a becomes High, and the detection output unit 2 of the encoder
The output SPFD of 91 also becomes High, and after the carriage 233 moves to the innermost circumference of the disk 242,
When the semiconductor laser 221 emits light and the light beam is detected by the output of the first photodetector 224 by the output of the first photodetector 224, the control device 207 switches the focus control to the focus control based on the information. An operation permission instruction is issued, and focus search (FOS) and focus control (FOD) are executed.

For this reason, during the operation of the lifting block 273 or when the disc is not rotating, the focus search and the focus control are prohibited from being performed, so that noise caused by a malfunction can be eliminated and the reliability of the apparatus can be ensured. At this time, the light beam is irradiated from the objective lens 333 to the rotating disk 242, and the carriage 233 is moved to the disk 242.
Since the focus control (FOD) is started after moving to the innermost circumference of, the focus search (FOS) is performed so that a stable pull-in can be performed.

The focus search and the focus control are as follows.
As described above, this is realized by controlling the energization of the electromagnet 271. As described above, there is an instruction to start the control. At this time, first, when a focus search signal is applied to the electromagnet 271, the energization causes a repulsive force between the electromagnet 271 and the permanent magnet 272 to cause the spindle cup 275, and thus the turntable 241, to move. The disk surface rises (see FIG. 1) and reaches a predetermined position (optimal focus pull-in position). Then, a focus control signal is superimposed on the electromagnet 271 to shut off the focus search signal in a stable state. After the cutoff, as described above, only the focus error signal based on the output of the photodetector 264 via the switch SW which has been switched to the ON state by the control device 207 depends on the strength of the repulsion between the electromagnet 271 and the permanent magnet 272. The focus control is performed so that the distance between the recording information surface of the disk 242 and the objective lens 333 is optimized.

In this way, the spindle motor 204
Can be independently driven, and the focus search and focus control can be performed along the motor axis. Therefore, the turntable 241
Turntable 2 only needs to be moved up and down.
The lifting block 273 is moved by moving
Can accurately and appropriately perform focus search and focus control without moving up and down.

The focus control is performed as described above, and the tracking control is also performed as described above.
In the present embodiment, when the energization of the tracking coil 335 is cut off, the plate spring is restored to the initial position by the expansion and contraction part. At this time, the eccentric component of the disk 242 is
It is also possible to perform control so that the access coil 337 is energized to perform two-step servo. And the disk 24
At the end of the recording / reproducing of the control unit 2, the control device 20 controls the focus control signal so that the power supply to the electromagnet 271 is cut off.
7, the rotation operation of the spindle motor 204 ends. Further, when the ejecting operation (cartridge unloading) is instructed from the control device 207, the elevating block 273 descends, and the apparatus returns to the initial position.

In the above embodiment, the disk 242 is positioned radially on the outer periphery of the disk hub 277. However, the disk 242 may be positioned on the inner peripheral side of the disk hub 277 by the spindle motor shaft 288. Further, as a modification of the electromagnetic drive device of the electromagnet 271 and the permanent magnet 272 shown in FIG. 1, a movable coil type may be used. Further, the present invention can be applied to a write-once type or a reproduction-only type.

[0047]

According to the first aspect of the present invention, there is provided an optical disk apparatus according to the present invention, in which a disk rotation motor (for example, the spindle motor 204 of the above embodiment) is used to read at least the information on a disk-shaped recording medium on which information is recorded by an optical head.
Is fixed at a predetermined position (for example, in the case of the above embodiment, the movable block 27 shown in FIG. 1 is combined with the lifting block 273 and the rack 278 in the above embodiment).
3), the optical head is moved closer to the disk-shaped recording medium so that the disk-shaped recording medium and the disk rotation motor are coupled to each other. A position detector that has a moving mechanism that moves the carriage to the innermost periphery so that the arranged carriage is disposed at the innermost periphery, and detects a state in which the movable member has reached the predetermined position; (For example, the reflection member 2 of the above embodiment)
82 and a photoreflector 283), and starts rotating the disk rotation motor after the position detector detects that the movable member has reached the predetermined position. Since the control circuit (e.g., the control device 207 of the above-described embodiment) is provided, there is an advantage that a highly reliable device can be provided with respect to at least reading information on the disk-shaped recording medium with the optical head. The optical disk device according to the present invention according to claim 2 is the optical disk device according to claim 1, wherein the movable member has reached the predetermined position and the lens (for example, the objective of the embodiment) is arranged on the disk-shaped recording medium and the optical head. Since the focus search is started by relative movement with the lens 333), there is an advantage that a reliable focus search can be expected.
The optical disk device of the present invention according to claim 3 is the first optical disk device.
In this case, the lifting motor moves the movable member to the predetermined position, so that there is an advantage that reliable movement of the movable member can be expected.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a spindle motor applicable to an optical disc device according to one embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a configuration of a separation optical system and a focus control system in the same apparatus.

FIG. 3 is a plan view showing an example of the configuration of the objective lens driving device.

FIG. 4 is an exploded perspective view thereof.

[Explanation of symbols]

 Reference Signs List 201 Main body 202 Fixed optical system block 203 Objective lens drive unit 204 Spindle motor 206 Drive circuit 206a Focus control (FOD) unit 206b Focus search (FOS) unit 207 Control unit (CPU) 221 Semiconductor laser 233 Carriage 241 Turntable 242 Magneto-optical Disk 251 Disk cartridge 264 Photodetector 271 Electromagnet 272 Permanent magnet 273 Elevating block 275 Spindle cup 280 Elevating motor 282 Reflecting member 283 Photoreflector 333 Objective lens

Claims (3)

[Claims] 1. A movable member to which a disk rotation motor is fixed moves toward a predetermined position so as to approach the disk-shaped recording medium in order to read at least the information on the disk-shaped recording medium on which information is recorded by an optical head. In the optical disk device in which the disk-shaped recording medium and the disk rotation motor are coupled, when starting a focus search, the carriage is arranged such that the carriage on which the optical head is disposed is located at the innermost circumference. A moving mechanism configured to move the movable member to the innermost circumference, a position detector that detects a state in which the movable member has reached the predetermined position, and a state in which the movable member has reached the predetermined position. An optical disc having a control circuit for starting the rotation of the disc rotation motor after detection by the position detector. Click device. 2. The focus search is started by a relative movement between the disk-shaped recording medium and a lens arranged in the optical head when the movable member reaches the predetermined position. 2. The optical disk device according to claim 1, wherein: 3. The optical disk device according to claim 1, wherein an elevating motor moves the movable member to the predetermined position.