JP2000036151A - Optical information recording and/or reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information recording and/or reproducing device capable of securing the reliability of the device by rotating a spindle motor with a disk placed thereon in the state a movable member is press, when the specified position of the movable member with the spindle motor placed thereon is detected. SOLUTION: The device is provided with the movable member, which is movable toward the side of a disk-like information recording medium while placing the spindle motor 204 thereon, and which is exerted with the pressing force elastically by a press member, and also a position detecting means for detecting the specified position of the movable member, and then the spindle motor 204 is rotated in accordance with the output of this detecting means. The rotation of the spindle motor 204 is started in such a manner that the spindle motor 204 with the disk placed thereon is rotated in the state the movable member is press when the specified position of the movable member with the spindle motor 204 placed thereon is detected, thereby the reliability of the device is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to optical information recording and / or
Or, it relates to a playback device.

[0002]

2. Description of the Related Art An optical information recording / reproducing apparatus using an optical head and driving at least an objective lens in a radial direction by a linear motor, a feed screw, or the like is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-321972 (hereinafter referred to as Document 1). ) Is known.

The optical information recording / reproducing apparatus disclosed in Document 1 discloses a configuration in which after a cartridge is inserted, a spindle motor is moved toward a disk by an elevating motor. With this configuration, the configuration in the vertical direction of the loading means can be omitted, and the device can be downsized by simplifying the configuration. The elevating motor performs focus control by driving and controlling the elevating motor based on a focus error signal from the optical pickup device while the disk table holds the disk.

On the other hand, for example, an apparatus disclosed in Japanese Patent Application Laid-Open No. 1-58901 (hereinafter referred to as Reference 2) is also known. In the disc reproducing apparatus described in the publication, when at least the fan-shaped cam (23) rotates as shown in FIG. 7 of the publication, the projection (28) of the support (25) is pushed up and the support (25) is raised. When the limit switch (2
The horizontal state is detected by 7), the motor (7) is stopped, and the disk is played. Thus, the disc can be reproduced. In addition, Japanese Patent Application Laid-Open No. 5-1517
An apparatus disclosed in Japanese Patent Publication No. 53 (hereinafter referred to as Reference 3) is also known. In the magneto-optical disk device described in the above publication, as shown in FIG.
Motor assembly (moving member) on which 0) is mounted (2)
Move along the guide pin (1a) via the sliding plate (16) by the action of the tension spring (biasing member) (14). The moving member (2) is provided with a spindle motor (10) mounted thereon and a pressing sensor (40), and directly presses on the cartridge case (100a) to detect the presence or absence of the cartridge.

[0005]

[0005] However, Document 1
, When loading is completed, the lifting block (18)
Is moved up and down by a very small amount (for example, a very small moving amount of 1 micron unit) so that the disk (102) is always at a predetermined position with respect to the objective lens (27) with respect to the objective lens (27). Focus control,
Although the movement control of the elevating block on which the turntable is mounted from the start of the ascent is disclosed, there is no description on when to rotate the spindle motor.

[0006] Also, in the literature 2, there is a description that the disk performance is started after the horizontal position is detected, but the slide plate (10) and the fan-shaped cam (23) are moved up and down on the support base (2).
No pressure is applied to 5). Further, in Document 3, the switch for detecting the predetermined position of the moving member (2) moving toward the disk also serves to detect the presence or absence of the cartridge, but the urging action of the tension spring (14) causes the sliding action. It is added to the moving member (2) via a plate (16).

In the configuration of Documents 1, 2, and 3, no bias is applied to the movable member, or the biasing force is applied, and the movable member moves toward the disk in that state, and a predetermined position is detected. However, it does not mention when the disk spins. If the semiconductor laser emits light in such a state, the information data on the recording medium surface may be destroyed, which has a drawback that the reliability of the device cannot be expected.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical information recording and / or reproducing apparatus having a spindle motor for rotating a disk-shaped information recording medium. An object of the present invention is to provide an optical information recording and / or reproducing apparatus which can rotate a spindle motor on which a disk is loaded in a pressed state, and can secure the reliability of the apparatus.

[0009]

According to a first aspect of the present invention, there is provided an optical information recording and / or reproducing apparatus having a movable member on which a spindle motor is mounted and which is movable toward a disk-shaped information recording medium. The movable member is elastically pressed by a pressing member and has position detecting means for detecting a predetermined position of the movable member, and the spindle motor is rotated based on an output of the detecting means. is there. The optical information recording and / or reproducing apparatus according to the present invention has a detecting means for detecting the rotation of the spindle motor and a position detecting means for detecting a predetermined position of the movable member, and outputs both detection signals. The focus search is started later. An optical information recording and / or reproducing apparatus according to a third aspect of the present invention is characterized in that the elastic member is a coil spring.

[0010]

In the present invention, the rotation of the spindle motor is started by detecting the predetermined position of the movable member on which the spindle motor is mounted, and rotating the spindle motor on which the disk is mounted while the movable member is being pressed. Also, a situation in which the reliability of the device is impaired can be avoided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the optical information recording and / or reproducing apparatus according to the present invention will be described below with reference to the drawings. FIG.
Shows an example of the structure of a spindle motor. In this example,
A mechanism for supporting the magneto-optical disk cartridge by a driving device for raising and lowering 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
A spindle motor 204 serving as a drive unit of a disk drive for rotating the magneto-optical disk 242 in the disk cartridge 251 is provided on the upper side via a movable member (hereinafter, referred to as a lifting block) 273 so as to be vertically movable. Has been established. An electromagnet 271 controlled to be energized is attached to the upper surface of the spindle motor 204. The surface of the electromagnet 271 is covered with plastic so as to be worn by contact with a permanent magnet 272 described later disposed above the electromagnet 271 and not to be disconnected. The spindle motor 204 is fixed to the lifting block 273 with screws (not shown) or the like.

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 2 is provided on the side of the lifting block 273.
78 is fixed. The gear 279 meshing with the rack 278 is fixed to the shaft of the elevating motor 280. With such a mechanism, when the lift motor is driven, the lift block 273 (therefore, the spindle motor 204 attached to the lift block 273) can be moved up and down by the lift motor. The guide shaft 2 is provided between the lifting block 273 and the main body 201.
A pressing member (hereinafter, referred to as a compression coil spring) 281 is interposed on the outer periphery of 74, and the lifting block 273 is urged upward by the compression coil spring 281.

A reflecting 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 turntable surface of the spindle cup 275.

In this embodiment, the spindle motor 204
And the table for mounting the disk 242 and the spindle motor shaft 288 can be driven independently, and along the motor shaft (thus including the lifting block 273 itself, do not move up and down). The focus search and the focus control can be performed by vertically moving the turntable of the speedle cup. Therefore, the spindle cup 2
75 is fitted with a key 289 inserted therein to prevent rotation with respect to the spindle shaft 288, so that the spindle cup 275 rotates integrally with the spindle shaft, and Cup 275
Can move up and down with respect to the spindle axis. Further, as a drive mechanism for moving the disk table 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 shaft 288, but the periphery thereof is concave. The bottom of the recess and the tip of the spindle shaft 288 are fixed by screws or the like. A compression coil spring 287 is interposed between the stopper 286 and the stopper 286. By the compression coil spring 287, the spindle cup 275 is urged downward with respect to the spindle shaft 288.

As shown in FIG. 2, the main body 201 is provided with an optical pickup device including a fixed optical block section 202 and an objective lens driving section 203 at a position lateral to the spindle motor 204. This optical pickup device irradiates a magneto-optical disk 242 mounted and mounted on a turntable 241 of a spindle motor 204 with a light beam for writing and reading information signals.

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 by the photodetector 224 is sent to an APC circuit 225 for keeping the amount of light emitted from the semiconductor laser 221 constant, and is also supplied to a control device (CPU) 207 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
In step 07, the focus search or the focus control is started by the detection output of both the rotation detection of the magneto-optical disk 242 and the detection of the position (hereinafter, ascending) of the spindle motor 204 approaching the disk-shaped recording medium. Output SPD of the photoreflector 283
P and an output SPFD of an encoder (not shown) associated with the rotation of the spindle motor 204 can be input as a control input, and switching of the switch SW is controlled by an 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, the reflected light is received by the photodetector 224 as described above, while the 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 a 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 coil 337U and the lower coil 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) which protrudes. 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 table 344 includes 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 range of expansion and contraction 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 portion 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) provided on the opposing surfaces of the access coil 337 and the tracking coil 335 of the lens holder 334 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. 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 unit 202.

The parallel light beam returned to the fixed optical block 202 is guided to the light detection optical system 260. That is,
The returned parallel light beam is transmitted to the second beam splitter 23.
The light is reflected at 2 and transmitted through the λ / 2 plate 261 to rotate the polarization plane by 45 degrees, is further focused by the condenser lens 262, and enters the polarization beam splitter 263 as an analyzer. The polarization beam splitter 263 transmits the P-polarized light component of the incident beam and transmits the polarization beam splitter 263.
And the S-polarized light component is reflected so as to be separated from the P-polarized light component, and emitted from the polarization beam splitter 263.
The light is received by each photodetector 264.

The output of the photodetector 264 provides a focus error signal indicating the amount of deviation in the optical axis direction between the converging point of the light beam converged by the objective lens 333 and the recording information surface of the disk 242, and the focusing 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.

The 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 controlled to be energized through the drive circuit 206, and the repulsion between the coil L and the permanent magnet 272 bonded and fixed to the spindle shaft of the turntable 241 on which the disk 242 is disposed is determined. When the recording information surface of the disk 242 is desired to be separated from the objective lens 333 of the carriage 233, control is performed so as to increase the amount of energization and increase the repulsive force, and to reduce the amount of energization and decrease the repulsive force when it is desired to approach the surface.

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 lifting 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 2, the front and rear portions of the cartridge holder are opened, and as shown in FIGS.
Reference numeral 51 stores the disk 242 rotatably in the cartridge. Further, the cartridge holder is capable of inserting the cartridge 251 in a state 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. Thus, the disk 242 is inserted between the objective lens and the magnetic head device.

When the cartridge 251 is inserted up to the 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 shaft of the spindle motor 204, and the output from the rotary encoder is FV-converted.
7 given.

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.

Further, when the disk 242 rotates,
After the carriage 233 moves to the innermost circumference, irradiation by the semiconductor laser 221 is performed.
When a light beam is emitted from the control device 207, the output from the photodetector 224 constituting the front monitor is a control input to the control device 207, and 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 unit 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 placed on the turntable 241. After that, the spindle motor 204 rotates the spindle shaft and the disk 242 at a constant rotational speed (for example, 3600 rpm).
m) is performed.

In the focus control circuit, when each of these states is completed, that is, when the lifting block 273 moves up, the photodetector 283 of the photo reflector 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 / lowering block 201 or when the disc is not rotating, the focus search and the focus control are prohibited from being performed, so that noise generated due to 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. For this reason, it is possible to avoid problems such as the conventional motor itself having a large size.
In addition, by performing the focus search and the focus control by moving the table up and down in this way, the permanent magnet of the objective lens driving device is not mounted on the carriage 233 that moves in the radial direction of the disk 242. It goes without saying that the weight is reduced and high-speed access becomes possible. Further, according to the present configuration, the support of the cartridge does not become unstable during the focus search as in the related art, and the contact and non-contact at the contact portion supporting the cartridge during the focus control are not performed. It is also possible to avoid the situation where noise due to repetition is generated and the reliability of the device is impaired. In this respect, it is also effective in removing noise and ensuring reliability. The present invention can be applied to an apparatus and can realize a stable optical information recording / reproducing apparatus.

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.
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 to cut off the power supply to the electromagnet 271.
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 is lowered, and the device returns to the initial position.

In the above embodiment, the disk 242 is positioned radially on the outer circumference of the disk hub 277, but may be positioned on the inner circumference of the disk hub 277 by a spindle shaft. Further, as a modification of the electromagnetic driving device of the electromagnet 271 and the permanent magnet 272 shown in FIG. 1, a moving coil type may be used. Although the embodiment is a recording / reproducing apparatus, the present invention can be applied to a write-once type or a reproduction-only type.

[0053]

According to the present invention, there is provided a movable member on which a spindle motor is mounted and movable toward the disk-shaped information recording medium, wherein the movable member is elastically pressed by a pressing member and the movable member is moved. The apparatus has position detecting means for detecting a predetermined position of the member, and rotates the spindle motor based on the output of the detecting means, so that the reliability of the apparatus can be ensured.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a spindle motor applicable to an optical information recording / reproducing apparatus 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 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 having a spindle motor mounted thereon and movable toward a disk-shaped information recording medium, wherein the movable member is elastically biased by a pressing member and detects a predetermined position of the movable member. An optical information recording and / or reproducing apparatus characterized in that the optical information recording and / or reproducing apparatus has a position detecting means for rotating the spindle motor based on an output of the detecting means. 2. A method according to claim 1, further comprising detecting means for detecting a rotation of a spindle motor and position detecting means for detecting a predetermined position of the movable member, wherein a focus search is started after outputting both detection signals. Item 2. The optical information recording and / or reproducing apparatus according to Item 1. 3. The optical information recording and / or reproducing apparatus according to claim 1, wherein the elastic member is a coil spring.