JP2006216110A - Optical disk driving mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk driving mechanism, which reduces resources and energy required for production, by applying simple processing to a member, which is usually disposed of or recycled, to form a clamper yoke which generates a magnetic force between it and a clamper magnet mounted on a clamp. <P>SOLUTION: A clamper yoke 24 is a cylindrical member having a large through hole 241 at its center and is a laminated body in which disk-shaped metallic plates 240 are laminated. Boss holes 242, which are formed to be symmetrical with respect to a central axis and through which the bosses 232 of inserting holes 23 pass, are formed at the thick parts of the clamper yoke 24. The clamper yoke has, at its upper end face, clearance parts for welding 243 which are formed on the same axis as the boss holes 242 and have a radius which are larger than that of the boss holes 242. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an optical disk drive mechanism for rotating an optical disk in an optical disk apparatus capable of recording and / or reading data by irradiating the optical disk with laser light.

2. Description of the Related Art Optical discs that can record and / or read information by irradiating a laser beam are used as recording media for information such as video and audio. As the optical disc, a CD (Compact Disc), a DVD (Digital Versatile Disc) and the like are widely used. An optical disk apparatus using these optical disks as recording media reads information recorded in advance on the optical disk or rotates information on a recordable optical disk by rotating the optical disk and irradiating the recording surface of the optical disk with laser light. Or record.

FIG. 8 is a side sectional view of an example of an optical disk drive mechanism provided in a conventional optical disk, and FIG. 9 is an exploded perspective view of an example of a turntable provided in the optical disk drive mechanism shown in FIG.
The optical disk drive mechanism 91 shown in FIG. 8 includes a turntable 92, a turntable 92, and a clamp 93 that is pressed by a magnetic force and holds the optical disk Ds so as not to rotate. The turntable 92 is rotated by a motor 94, and the motor 94 has a rotating shaft 941.
And a bearing 942, a housing 943, a laminated core 944, a rotor 945, a permanent magnet 946, and a coil 947.

The turntable 92 shown in FIG. 9 has a disk mounting portion 921 for mounting an optical disk.
A through-hole 922 penetrating a through-hole formed in the center of the optical disk in the center of the turntable 92, an insertion hole 923 formed in the through-hole 922, and a permanent magnet 946 described below provided in the clamp 93. And a clamper yoke 924 for forming a magnetic field between them.
A through hole 925 is formed in the center of the turntable 92, and the rotation shaft 941 is fixed to the through hole 925 so as not to move.

A boss 926 is formed on the bottom surface of the insertion hole 923 of the turntable 92. A through hole 9241 is formed at the center of the clamper yoke 924. Clamper yoke 924
A boss hole 9242 is formed in a portion where the through hole 9241 is not formed. Two boss holes 9242 are provided in the clamper yoke 924, and are formed at positions facing each other with the through hole 9241 interposed therebetween.

The clamper yoke 924 is inserted into the insertion hole 923 so that the boss 926 passes through the boss hole 9242.
The tip of the boss 926 is heated and welded. Boss hole 924 of clamper yoke 924
2 is formed with a concave welding escape portion 9243 for accumulating molten resin. The molten resin flows into the welding escape portion 9243 and solidifies, whereby the clamper yoke 924 is fixed to the insertion hole 923. By welding in this way, the clamper yoke 924 is inserted into the insertion hole 923.
Prevents you from getting out of your way.

The rotor 945 is formed with a cylindrical curved surface portion 9451 and a flat surface portion 9451 which is closed at one end of the curved surface portion 9451. Inside the curved surface portion 9451 of the rotor 945, there is a permanent magnet 9.
46 are attached at equal central angular intervals. A through hole 9453 is provided at the center of the flat surface portion 9453.
The rotation shaft 941 penetrates and is fixed to the rotation shaft 941.
A bearing 942 is disposed in the housing 943, and the rotating shaft 941 is supported by the housing 943 via the bearing 942 so as to be rotatable.

A laminated core 944 is fixed to the outer periphery of the housing 943. In the laminated core 944, nine coil winding portions 9442 that protrude in the radial direction on the cylindrical portion 9441 are arranged at equal central angular intervals. The coil winding portion 9442 is formed with an end plate extending in the circumferential direction on the side opposite to the side connected to the cylindrical portion 9441. A coil 947 is wound around the coil winding portion 9442. The laminated core 944 is formed by laminating iron plates formed in a predetermined shape with an insulating material interposed therebetween. By stacking the insulating materials, the generation of eddy current can be reduced and energy loss can be suppressed accordingly.

As shown in FIG. 8, the clamp 93 includes a pressing member 931 and a clamper magnet 932. The pressing member 931 has a pressure-bonding portion 933 for pressure-bonding the optical disk Ds and an engagement recess 934 that engages with the through-hole 922 of the turntable 92. The clamper magnet 932 has a cylindrical shape, and is firmly fixed to the engaging recess 934 so as not to drop off.

When the optical disk Ds is arranged on the turntable 92, the clamp 93 is connected to the optical disk Ds.
And crimping from the opposite side of the turntable 92. At this time, the clamper magnet 9
32 and the clamper yoke 924 are attracted by a magnetic force, whereby the optical disk Ds can be firmly fixed to the turntable 92 (see Japanese Patent Laid-Open No. 10-241275, etc.).
.

A rotating magnetic field is formed by supplying electric power to the coil 947 wound around each coil winding portion 9442 at a predetermined timing. As the magnetic field rotates, the permanent magnet 946 attached to the rotor 945 rotates in accordance with the magnetic field, and the rotor 945 rotates. Rotor 945
The turntable 92 is connected by a rotating shaft 941, and the turntable 92 is rotated by rotating the rotor 941 (JP-A-6-6963, JP-A-10-143).
No. 987).
JP-A-10-241275 JP-A-6-6963 Japanese Patent Laid-Open No. 10-143987

The laminated core 944 of the optical disk drive mechanism 91 is formed one layer at a time using a mold, and is formed by punching the center and laminating with an insulating layer in between. Perforated laminated core 944
The central part of the core is discarded or reused as the material of the laminated core 944 again. However, when it is discarded, a large amount of raw material is consumed to produce the laminated core 944, which is wasteful. Even in the case of recycling, since the laminated core 944 is a metal, a large amount of energy must be used for regeneration, resulting in poor manufacturing efficiency.

Further, the clamper yoke 924 requires special processing such as bending and drawing in order to form a welding escape portion 9243 for allowing the molten resin to escape when the boss 926 is welded.
Therefore, time and cost are required for processing.

In view of this, the present invention provides a simple process for a member that has been discarded or recycled, and forms a clamper yoke that generates a magnetic force between the clamper magnet and a clamper magnet attached to the clamp. An object of the present invention is to provide an optical disk drive mechanism capable of reducing the above.

To achieve the above object, the present invention provides an optical disk drive mechanism for rotating an optical disk,
An optical head for irradiating the optical disk with laser light, a signal processing device for processing a signal, and a signal detected by the optical head and decoded by the signal processing device to an external video display unit In an optical disc apparatus comprising an external connection unit for connection and a control unit, the optical disc drive mechanism includes a turntable for rotating the optical disc by placing the optical disc on top and rotating itself, and the turntable. And a clamp for sandwiching the optical disk, and a motor for driving the turntable, the turntable having a disk mounting surface for placing the optical disk, and a through hole formed in the center of the optical disk The insertion portion includes a penetration portion that penetrates the hole, and a clamper yoke that is inserted into an insertion hole formed in the penetration portion. Includes a boss that passes through the clamper yoke and fixes the clamper yoke by welding a tip portion thereof to the clamper yoke. The motor is connected to the turntable. A bearing that rotatably supports,
A housing in which the bearing is inserted, and a laminated core that is fixed to an outer peripheral portion of the housing and includes a plurality of coil winding portions in which a coil is wound in an axial direction at equal central angular intervals;
A cylindrical rotor disposed between the housing and the turntable and fixed to the rotating shaft; and a plurality of permanent magnets disposed on an inner surface of the rotor so as to face a coil winding portion of the laminated core. The clamp is attached to and detached from the turntable, and includes a pressing member that presses the optical disk from the side opposite to the disk mounting surface, and a clamper magnet that forms a magnetic field with the clamper yoke. The presser member has a crimping portion for crimping the optical disk and an engagement recess for engaging with the through portion of the turntable, and the clamper magnet has a cylindrical shape. A core original plate that is firmly fixed so as not to drop off in the recess, and the clamper yoke is before molding of the core plate that forms each layer of the laminated core And those formed by stacking the disk-shaped metal plate is a central unit upon punching the central by pressing, of the disc-shaped metal plate which is the laminated,
A boss hole is formed in each disk-like metal plate except one of the uppermost layers in a cylindrical shape at a predetermined position so that the boss can pass therethrough. A diameter larger than the boss hole is formed in the uppermost disc-like metal plate. There is provided an optical disk drive mechanism characterized in that it is formed by punching a cylindrical welding escape portion having s.

According to this configuration, the clamper yoke can be manufactured by performing simple processing and stacking on a member that has been removed and discarded by press processing when manufacturing the laminated core of the motor. Also, when welding the boss, the welding flow part is complicatedly processed (bending,
It can be formed by press working without using drawing or the like.

According to this configuration, since the previously discarded members are used, the amount of material necessary for manufacturing the optical disk drive mechanism can be reduced, and resource saving can be achieved accordingly. In addition, since complicated processing is not required, manufacturing equipment for complicated processing is not required, and thus the manufacturing equipment can be simplified accordingly. Furthermore, since it is possible to reuse a conventionally discarded member without regenerating it, it is possible to reduce the consumption of energy required for the regeneration.

In order to achieve the above object, the present invention provides an optical disk drive mechanism for rotating an optical disk, an optical head for irradiating the optical disk with laser light, a signal processing device for processing a signal, and the optical head. In an optical disc apparatus comprising an external connection unit for connecting a signal detected and decoded by the signal processing device to an external video display unit, and a control unit,
The optical disk drive mechanism includes: a turntable that rotates the optical disk by placing the optical disk on the top and rotating itself; a clamp that sandwiches the turntable and the optical disk; and a motor that drives the turntable. The turntable has a disk mounting surface on which the optical disk is placed, a through part that penetrates a through hole formed in the center of the optical disk, and an insertion hole formed in the through part. A rotary hook having a clamper yoke to be inserted, and capable of being prevented from coming off by rotating the clamper yoke in the insertion hole, and having a rotation-stop boss for preventing the clamper yoke from rotating on the lower surface The motor has a rotating shaft connected to the turntable, and supports the rotating shaft so as to be rotatable. A receiving core; a housing in which the bearing is inserted; a laminated core that is fixed to an outer peripheral portion of the housing and includes a plurality of coil winding portions around which coils are wound in the axial direction; And a cylindrical rotor disposed between the turntable and fixed to the rotating shaft, and a plurality of permanent magnets disposed on the inner surface of the rotor so as to face the coil winding portion of the laminated core. And the clamp is
And a pressing member for pressing the optical disk from the side opposite to the disk mounting surface, and a clamper magnet for forming a magnetic field with the clamper yoke, wherein the pressing member is the optical disk. The clamper magnet has a cylindrical shape and is firmly fixed so as not to drop off in the engagement recess. The clamper yoke is formed by laminating a disc-shaped metal plate which is a central portion when the center of the core original plate before being formed of the core plate forming each layer of the laminated core is punched out by pressing. And
Among the stacked disk-shaped metal plates, the uppermost disk-shaped metal plate has a plurality of engagement recesses that engage the tool when the clamper yoke is attached to the outer peripheral portion at equal central angular intervals. The lowermost disk-shaped metal plate is formed in a lowermost disc-shaped metal plate with a hook passage portion having a size that allows the rotation hook portion to pass through an outer peripheral portion, and the rotation-stop boss at a position moved a predetermined distance in the circumferential direction of the hook passage portion. A plurality of engaging non-rotating boss holes are formed by punching at equal central angular intervals, and the remaining disc-shaped metal plate has a length approximately twice the circumferential length of the hook threaded portion on the outer peripheral portion. Are formed at the same number of equal central angular intervals as the hook-through portion, and the disk-shaped metal plate other than the lowermost layer and the uppermost layer is formed in the disk shape of the lowermost layer so that the notches overlap exactly. Metal plate hook through and rotation stopper The engagement recess of the uppermost disc-shaped metal plate does not overlap with the notch so that the notch overlaps with the notch and the circumferential end of the hook threading portion and the circumferential end of the notch overlap. An optical disk drive mechanism characterized by being arranged and stacked as described above is provided.

According to this configuration, the clamper yoke can be manufactured by performing simple processing and stacking on a member that has been removed and discarded by press processing when manufacturing the laminated core of the motor. Also, when welding the boss, the welding flow part is complicatedly processed (bending,
It can be formed by press working without using drawing or the like. Further, the boss of the insertion hole formed in the through portion of the turntable can be omitted, and the clamper yoke can be fixed to the insertion hole without performing boss welding.

According to this configuration, since the previously discarded members are used, the amount of material necessary for manufacturing the optical disk drive mechanism can be reduced, and resource saving can be achieved accordingly. In addition, since complicated processing is not required, manufacturing equipment for complicated processing is not required, and thus the manufacturing equipment can be simplified accordingly. Furthermore, since it is possible to reuse a conventionally discarded member without regenerating it, it is possible to reduce the consumption of energy required for the regeneration. In addition, since boss welding is not performed, energy consumption for heating and melting the tip of the boss can be reduced.

Furthermore, in order to achieve the above object, the present invention provides an optical disc apparatus for reading or recording data by irradiating an optical disc with a laser beam, the optical disc apparatus having a turntable for placing the optical disc when the optical disc is rotated, The clamp for sandwiching the turntable and the optical disc, the motor for rotating the optical disc, the laminated core attached to the motor, the clamper yoke attached to the turntable, and the magnetic force fixed to the clamp and the magnetic force A clamper magnet for attracting the clamper yoke, and the clamper yoke is formed by laminating a disk-shaped metal plate which is a central portion when the center of the core plate forming each layer of the laminated core is punched Provided is an optical disk drive mechanism characterized in that

According to this configuration, the clamper yoke can be manufactured by performing simple processing and stacking on a member that has been removed and discarded by press processing when manufacturing the laminated core of the motor. Also, when welding the boss, the welding flow part is complicatedly processed (bending,
It can be formed by press working without using drawing or the like.

According to this configuration, since the previously discarded members are used, the amount of material necessary for manufacturing the optical disk drive mechanism can be reduced, and resource saving can be achieved accordingly. In addition, since complicated processing is not required, manufacturing equipment for complicated processing is not required, and thus the manufacturing equipment can be simplified accordingly. Furthermore, since it is possible to reuse a conventionally discarded member without regenerating it, it is possible to reduce the consumption of energy required for the regeneration.

The said structure WHEREIN: It is good also as what is pierce | punched into a different shape with the layer on which the said disk shaped metal plate is laminated | stacked. By forming different shapes depending on the layers to be laminated in this manner, it is possible to form a predetermined shape in a place where processing such as the side surface of the clamper yoke is difficult.

According to the present invention, a conventionally discarded member is simply processed to form a clamper yoke that generates a magnetic force with a clamper magnet attached to the clamp, thereby reducing resources and energy required for manufacturing. It is possible to provide an optical disk drive mechanism that can be used.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a layout view of an optical disc apparatus according to the present invention. The optical disc apparatus shown in FIG.
It is a VD player. A DVD player PL shown in FIG. 1 is an optical disc (DVD recording medium).
An optical disk drive mechanism 1 that rotates Ds, an optical head A that irradiates light to the optical disk Ds to read information, a decoder Dc that decodes a signal detected by the optical head A, and a monitor Mn that is an external display device The external connection part Oc for connecting to and the control part Cont are provided.

The DVD player PL is controlled by the control unit Cont, and when the user gives a command to reproduce the DVD, first, the optical disk drive mechanism 1 is driven to rotate the optical disk Ds. The optical disk Ds rotating from the optical head A is irradiated with laser light, and the reflected light is detected by the optical head A. A light receiving element Pd, which will be described later, provided in the optical head A converts detected light into an electrical signal. The electrical signal is sent to the decoder Dc, demodulated into a video signal, and monitored via the external connection portion Oc. The image is sent to Mn and displayed on the monitor Mn.

2 is a cross-sectional view of an example of an optical disk drive mechanism according to the present invention, FIG. 3A is an exploded perspective view of a clamper yoke and a turntable used in the optical disk drive mechanism shown in FIG.
(B) shows a perspective view of the laminated core. The optical disk drive mechanism 1 shown in FIG.
, A clamp 3 that holds the turntable 2 and the optical disc Ds so as not to slip by sandwiching the optical disc Ds with the turntable 2, and a motor 4 that rotates the turntable 2.

As shown in FIGS. 2 and 3, the turntable 2 includes an optical disc placement portion 21 for placing the optical disc Ds, and a through portion 22 penetrating a through hole D1 provided in the center of the optical disc Ds.
And an insertion hole 23 formed in the penetrating portion 22 and a clamper yoke 24.

An insertion hole 23 is formed in the penetrating portion 22 so that the clamper yoke 24 can be inserted. The bottom 231 of the insertion hole 23 is formed with two cylindrical bosses 232, although not limited thereto. The boss 232 and the turntable 2 are integrally formed of resin. A through hole 25 is formed at the center of the insertion hole 23 to which a rotating shaft 41 that connects the turntable 2 and the motor 4 is fixed.

The clamper yoke 24 is a cylindrical member having a large through-hole 241 at the center, but is not limited thereto, but is a laminated body in which four disk-shaped metal plates 240 are laminated. The thicker portion of the clamper yoke 24 is formed symmetrically with respect to the central axis, and the boss 23 of the insertion hole 23 is formed.
A boss hole 242 through which 2 penetrates is formed, and a welding escape portion 243 that is formed coaxially with the boss hole 242 and has a larger radius than the boss hole 242 is formed on the upper end surface.

The clamper yoke 24 is disposed in the insertion hole 23 so that the boss 232 penetrates the boss hole 242. The tip of the boss 232 protruding from the boss hole 242 is heated and melted. Melted boss 2
32 spreads to the welding escape portion 243 and hardens, so that the clamper yoke 24 can be retained in the insertion hole 23.

The motor 4 includes a rotating shaft 41 connected to the turntable 2, a bearing 42 that rotatably supports the rotating shaft 41, a housing 43 in which the bearing 42 is disposed, and a laminated core 44 that is fixed to the outside of the housing 43. And a cylindrical rotor 45 fixed to the rotating shaft 41. The bearing 42 exemplifies a metal sliding bearing, but is not limited thereto, and a bearing that supports the rotating shaft 41 so that it can rotate stably can be widely used.

As shown in FIG. 3B, in the laminated core 44, nine coil winding portions 442 projecting in the radial direction on the cylindrical portion 441 are arranged at equal central angular intervals. The coil winding part 442 has an end plate 443 extending in the circumferential direction on the side opposite to the side connected to the cylindrical part 441. A coil 444 is wound around the coil winding portion 442. The laminated core 44 is formed by stacking a plurality of metal core plates 440 and attaching them together, and an insulating material is sandwiched between the core plates 440 and 440. Generation | occurrence | production of an eddy current can be reduced by laminating | stacking an insulating material between adjacent core plates 440, and energy loss can be suppressed that much.

The rotor 45 is formed with a cylindrical curved surface portion 451 and a flat surface portion 452 closed at one end of the curved surface portion 451. A through hole 453 is formed at the center of the flat surface portion 452, and the through hole 453 is fixed to the rotary shaft 41 while the rotary shaft 41 passes therethrough. Curved surface portion 451
On the inner side, permanent magnets 454 are attached at equal central angular intervals. The number of permanent magnets 454 is not limited thereto, but is 12 here, and they are arranged at equal central angular intervals.

A rotating magnetic field is generated by causing a current to flow through the coil 444 wound around the coil winding portion 442 of the laminated core 44 in order at a predetermined timing. The rotor 45 is rotated by rotating the permanent magnet 454 in a rotating magnetic field. The rotation of the rotor 45 rotates the turntable 2 via the rotation shaft 41, thereby rotating the optical disc Ds.

As shown in FIG. 2, the clamp 3 includes a pressing member 31 and a clamper magnet 32. The pressing member 31 has a pressure-bonding portion 311 for pressure-bonding the optical disk Ds and an engagement recess 312 that engages with the penetration portion 22 of the turntable 2. The clamper magnet 32 has a cylindrical shape and is firmly fixed to the engaging recess 312 so as not to drop off.

The clamp 3 is rotatably supported by a member not shown. The clamp 3 and the turntable 2 sandwich the optical disk Ds by the magnetic force generated by the magnetic field generated in the clamper magnet 32 and the clamper yoke 24. When the turntable 2 rotates, the optical disk Ds is removed from the disk mounting portion 21 of the turntable 2. It can prevent slipping and slipping.

FIG. 4 shows a plan view of the clamper yoke and the core plate according to the present invention. Clamper yoke 24
Is manufactured by laminating the remaining disk-shaped metal plate 240 formed by pressing the core plate 440 of the laminated core 44. First, the core plate 44 of the laminated core 44 is formed by pressing a metal plate.
A core original plate 4401 which is a zero original plate is formed.

A central portion 4402 of the core original plate 4401 shown in FIG. A core plate 440 is formed by punching out the central portion 4402 of the core original plate 4401. At this time,
The remaining metal punched out of the central portion 4402 is used as a disk-shaped metal plate 240 before the clamper yoke 24 is laminated (see FIGS. 4B and 4C).

At this time, the caulking portion 4 at a predetermined position of the core plate 440 (here, three locations at equal central angular intervals).
45 is also formed. The caulking portion 445 has a concave hole 4451 on one surface and a convex portion 445 on the other surface.
2 is formed.

The manufacture of the disk-shaped metal plate 240 before the clamper yoke 24 is laminated is as follows. As shown in FIG. 4B, a cylindrical through hole is formed at the center of the central portion 4402. At the same time when the central portion 4402 of the core original plate 4401 is punched out by pressing, boss holes 242 into which the bosses 232 of the insertion holes 23 are inserted are formed at two locations by pressing. At this time, the caulking portion 244 (three locations at equal central angular intervals in the portion where the boss hole 242 is not formed is provided.
A concave hole 2441 on the lower surface and a convex portion 2442 on the upper surface shown in FIG. 5 described later are formed.

The disc-shaped metal plate 240 laminated on the uppermost layer of the clamper yoke 24 has a boss hole 2.
A welding escape portion 243 that is a through-hole having a diameter larger than that of the boss hole 242 is formed by press working at the same place where the 42 is formed. Further, three caulking portions 244 are formed at equal central angular intervals in a portion where the welding escape portion 243 is not formed. Here, the caulking portion 244 is formed at the same position in the vertical direction in each disk-shaped metal plate 240 to be laminated.

Further, after the uppermost disk-shaped metal plate 240 is stacked, there is no need to stack the disk-shaped metal plate 240, so that the portion where the caulking portion 244 is formed is slightly larger than the caulking portion 244. A hole 245 is formed.

FIG. 5 shows an enlarged sectional view of the clamper yoke. As shown in FIG.
As shown in FIG. 4, four disk-shaped metal plates 240 from below are caulked portions 244 are formed. As described above, the caulking portion 244 has a concave hole 2441 formed on one surface (here, the lower surface) and a convex portion 2442 formed on the other surface (here, the upper surface).

The disk-shaped metal plate 240 is arranged so that the caulking portion 244 overlaps in the vertical direction, and is pressed in the vertical direction. At this time, the convex portion 2442 of the disk-shaped metal plate 240 disposed below is press-fitted into the concave portion 2441 of the disk-shaped metal plate 240 disposed above and laminated. Thus, four disc-shaped metal plates 2
The clamper yoke 24 is formed by laminating 40.

Further, in the fifth and subsequent disk-shaped metal plates 240, through holes 245 are formed in the portions where the caulking portions 244 are formed, and the convex portions 2442 of the caulking portions 244 are inserted into the through holes 245. Since the inner diameter of the through hole 245 is larger than the outer shape of the convex portion 2442, it is not press-fitted and is not stacked. Since the laminated core 44 is formed by laminating 10 core plates 440, when the laminated core 44 is completed, the disk-shaped metal plate 240 that is not laminated with the clamper yoke 24.
6 are manufactured.

Thus, when manufacturing the clamper yoke 24 by laminating the disk-shaped metal plates 240, the boss holes 242 and the welding escape portions 243 can be formed only by pressing. The same applies to the lamination of the core plate 440 of the laminated core 44, and the convex portions 4452 of the caulking portion 445 of the lower core plate 440 are laminated by press-fitting the concave portions 4452.

Of the disc-shaped metal plates 240 of the clamper yoke 24, the fifth and subsequent disc-shaped metal plates 240 may be those in which the boss holes 242 and the weld escape portions 243 are not formed. The number of parts to be pressed is reduced, and it is possible to extend the life of the equipment and tools that perform the pressing.

FIG. 6 is an exploded perspective view of a clamper yoke and a turntable used in the optical disk drive mechanism according to the present invention, and FIG. 7 is a plan view of the clamper yoke shown in FIG. As shown in FIG. 6, the turntable 5 has an optical disc placement section 5 on which the optical disc Ds is placed.
1, a rotation hook portion 531 on the inner wall of the insertion hole 53 of the penetrating portion 52, and a rotation stop boss 532 provided at the lower portion of the rotation hook portion 531. Further, the clamper yoke 54 has a hook engaging portion 541 for engaging with the rotary hook portion 531 of the turntable 5, a rotation stop boss hole 542 that fits with the rotation stop boss 532, and the clamper yoke 54 that rotates during assembly. An engaging recess 543 for engaging the tool to be engaged is formed.

The clamper yoke 54 is manufactured by laminating four disk-shaped metal plates 540 as shown in FIG. In the disc-shaped metal plate 540a disposed at the lowermost part, three hook threading portions 544 for hook threading are disposed at equal central angular intervals (120 degrees in this case), and predetermined in the circumferential direction of the hook threading portion 544. A rotation-stop boss hole 542 is formed at a location separated by a distance.

The second and third disk-shaped metal plates 540b and 540c are formed with a notch 545 that is twice as long as the hook-through portion 544 formed in the disk-shaped metal plate 540a having a circumferential length at the bottom. Has been. The uppermost disk-shaped metal plate 540d is formed with an engagement recess 543 for engaging a tool when the clamper yoke 54 is attached.

The disc-shaped metal plates 540a, 540b, 540c, and 540d shown in FIG. 7 are laminated in this order, whereby a hook-like hook engaging portion 54 is formed on the side surface of the clamper yoke 54 as shown in FIG.
1 is formed. It arrange | positions so that the rotation hook part 531 of the turntable 5 may be passed through the hook penetration part 544 of the hook engaging part 541. FIG. At this time, the rotary hook portion 531 is engaged with the hook engaging portion 541 by engaging and turning the tool in the engaging recess 543 of the clamper yoke 54.

Normal time (when the clamp 3 and the turntable 5 do not hold the optical disk Ds)
The clamper yoke 54 is supported by contacting the uppermost disk-shaped metal plate 540 a with the upper surface of the rotary hook portion 531. When the optical disk Ds is sandwiched between the clamp 3 and the turntable 5, the clamper yoke 54 is pulled toward the clamp 3 by the magnetic force of the clamper magnet 32 attached to the clamp 3. As a result, the rotation-stop boss 532 provided at the lower portion of the rotary hook portion 531 becomes the lowermost disc-shaped metal plate 540 d of the clamper yoke 54.
It is possible to prevent the clamper yoke 54 from rotating in accordance with the turntable 5 when the turntable 5 is rotated.

As described above, the hook engaging portion 541 is formed on the side surface of the clamper yoke 54, and the clamper yoke 54 is inserted into the insertion hole 53 by engaging the hook portion 531 with the hook engaging portion 541.
In the case of what is arranged in the above, the welding boss formed in the insertion hole 53 is not necessary. Also, since welding is not necessary, it takes less time to assemble. Further, the clamper yoke 54
Since it is attached without welding, it can be easily attached to and detached from the turntable 5.

The clamper yoke 5 is a circular metal plate 5 at the center of the core plate 440 that forms the laminated core 44.
40 is processed into a predetermined shape by press working and stacked, and a complicated hook engaging portion 541 and an engaging recess 543 for rotating assembly as shown in FIG. 7 are formed. However, since it does not require complicated processing, it can be manufactured in a short time without much effort.
It is possible to reduce the cost of manufacturing and manufacturing equipment.

In the above-described embodiment, the clamper yoke 24 is formed by laminating four disk-shaped metal plates 240, and the laminated core 44 is formed by laminating ten core plates 440. However, the present invention is not limited to this. Absent. Original core plate 44 for manufacturing disk-shaped metal plate 240 and core plate 440
01 employs a metal flat plate formed by press working, but is not limited thereto, and widely employs a material capable of forming the core original plate 4401 such as compression molding, sintering molding, and casting. be able to. Further, although the core original plate 4401 is illustrated as being formed of a metal, the core original plate 4401 is not limited thereto, and those formed of a magnetic material can be widely employed.

The optical head of the present invention can be applied to an optical disc apparatus that reads information by irradiating an optical disc such as a DVD, CD, or LD with laser light, or records information on a writable optical disc.

1 is a layout view of an optical disc device according to the present invention. FIG. It is sectional drawing of an example of the optical disk drive mechanism which concerns on this invention. FIG. 3A is an exploded perspective view of a clamper yoke and a turntable used in the optical disk drive mechanism shown in FIG. 2, and FIG. It is a top view of a clamper yoke and a core board concerning the present invention. It is an expanded sectional view of the clamper yoke used for the optical disk drive mechanism shown in FIG. It is a disassembled perspective view of the clamper yoke and turntable used for the optical disk drive mechanism concerning this invention. It is a top view when the clamper yoke shown in FIG. 6 is disassembled. It is a sectional side view of an example of the optical disk drive mechanism with which the conventional optical disk is equipped. It is a disassembled perspective view of an example of the turntable with which the optical disk drive mechanism shown in FIG. 8 is equipped.

Explanation of symbols

Ds Optical disk Mr Mirror Bs Beam splitter Ld Laser light source Pd Light receiving part 1 Optical disk drive mechanism 2 Turntable 21 Optical disk mounting part 22 Through part 23 Insertion hole 231 Bottom part 232 Boss 24 Clamper yoke 240 Disc-shaped metal plate 241 Through hole 242 Boss Hole 243 Welding escape portion 244 Caulking portion 2441 Recessed hole 2442 Protruding portion 25 Through hole 3 Clamp 31 Pressing member 311 Crimping portion 312 Engaging recess 32 Clamper magnet 4 Motor 41 Rotating shaft 42 Bearing 43 Housing 44 Laminated core 440 Core plate 4401 Core original plate 441 Cylindrical part 442 Coil winding part 443 End plate 444 Coil 445 Caulking part 4451 Concave hole 4452 Convex part 45 Rotor 451 Curved part 452 Flat part 453 Through hole 454 Permanent magnet 5 Turntable 51 Optical disk mounting part 2 through portion 53 insertion hole 531 rotating hook 532 rotation stop bosses 54 Clamper yoke 540,540a, 540b, 540c, 540d disc-shaped metal plate 541 hook engaging portion 542 rotation stopping boss hole 543 engagement recess 544 hooks through portions

Claims (4)

An optical disk drive mechanism for rotating an optical disk, an optical head for irradiating the optical disk with laser light, a signal processing apparatus for processing signals, and a signal detected by the optical head and decoded by the signal processing apparatus In an optical disc apparatus comprising an external connection unit for connecting the received signal to an external video display unit, and a control unit,
The optical disk drive mechanism includes: a turntable that rotates the optical disk by placing the optical disk on the top and rotating itself; a clamp that sandwiches the turntable and the optical disk; and a motor that drives the turntable. Have
The turntable includes a disk mounting surface on which the optical disk is placed, a through part that passes through a through hole formed in the center of the optical disk, and a clamper yoke that is inserted into an insertion hole formed in the through part. And
The insertion hole has a boss that penetrates the clamper yoke and fixes the clamper yoke by welding the tip to the clamper yoke.
The motor has a rotating shaft connected to the turntable, a bearing that rotatably supports the rotating shaft, a housing in which the bearing is inserted, an outer peripheral portion of the housing, and an axial coil A laminated core provided with a plurality of coil winding portions at equal central angular intervals, a cylindrical rotor disposed between the housing and the turntable and fixed to the rotating shaft, and the rotor It has a plurality of permanent magnets arranged on the inner surface against the coil winding portion of the laminated core,
The clamp is attached to and detached from the turntable, and includes a pressing member that presses the optical disk from the side opposite to the disk mounting surface, and a clamper magnet that forms a magnetic field with the clamper yoke. The member has a crimping portion for crimping the optical disk and an engagement recess that engages with the penetration portion of the turntable, and the clamper magnet has a cylindrical shape so that it does not fall into the engagement recess. Firmly fixed,
The clamper yoke is formed by laminating a disk-shaped metal plate which is a central portion when the center of a core original plate before being formed of the core plate forming each layer of the laminated core is punched out by pressing. A disc-shaped metal plate excluding one of the uppermost layers among the disc-shaped metal plates to be laminated is formed in a cylindrical position at a predetermined position to form a boss hole through which the boss penetrates; An optical disk drive mechanism characterized by punching and forming a cylindrical welding escape portion having a diameter larger than that of the boss hole. An optical disk drive mechanism for rotating an optical disk, an optical head for irradiating the optical disk with laser light, a signal processing apparatus for processing signals, and a signal detected by the optical head and decoded by the signal processing apparatus In an optical disc apparatus comprising an external connection unit for connecting the received signal to an external video display unit, and a control unit,
The optical disk drive mechanism includes: a turntable that rotates the optical disk by placing the optical disk on the top and rotating itself; a clamp that sandwiches the turntable and the optical disk; and a motor that drives the turntable. Have
The turntable includes a disk mounting surface on which the optical disk is placed, a through part that passes through a through hole formed in the center of the optical disk, and a clamper yoke that is inserted into an insertion hole formed in the through part. And
The insertion hole can be prevented from coming off by rotating the clamper yoke, and has a rotation hook portion formed with a rotation stop boss for preventing the clamper yoke from rotating on the lower surface,
The motor has a rotating shaft connected to the turntable, a bearing that rotatably supports the rotating shaft, a housing in which the bearing is inserted, an outer peripheral portion of the housing, and an axial coil A laminated core provided with a plurality of coil winding portions at equal central angular intervals, a cylindrical rotor disposed between the housing and the turntable and fixed to the rotating shaft, and the rotor It has a plurality of permanent magnets arranged on the inner surface against the coil winding portion of the laminated core,
The clamp is attached to and detached from the turntable, and includes a pressing member that presses the optical disk from the side opposite to the disk mounting surface, and a clamper magnet that forms a magnetic field with the clamper yoke. The member has a crimping portion for crimping the optical disk and an engagement recess that engages with the penetration portion of the turntable, and the clamper magnet has a cylindrical shape so that it does not fall into the engagement recess. Firmly fixed,
The clamper yoke is formed by laminating a disk-shaped metal plate which is a central portion when the center of a core original plate before being formed of the core plate forming each layer of the laminated core is punched out by pressing. Yes,
Among the stacked disk-shaped metal plates, the uppermost disk-shaped metal plate has a plurality of engagement recesses that engage the tool when the clamper yoke is attached to the outer peripheral portion at equal central angular intervals. Formed,
The lowermost disk-shaped metal plate has a hook-passing portion having a size that allows the rotating hook portion to pass through an outer peripheral portion, and a rotation that engages with the rotation-stop boss at a position moved a predetermined distance in the circumferential direction of the hook-passing portion. A plurality of stop boss holes are formed by punching at equal central angular intervals,
In the remaining disk-shaped metal plate, notches having a length approximately twice the circumferential length of the hook threading portion are formed on the outer peripheral portion at the same center angle interval as the hook threading portion,
The lowermost disk-shaped metal plate other than the uppermost layer and the uppermost layer are overlapped with the notch so that the notch is exactly overlapped with the lowermost disk-shaped metal plate, and the notch of the hook-through part An optical disc characterized by being arranged and laminated so that the engagement recess of the uppermost disc-shaped metal plate does not overlap the notch so that the circumferential end and the circumferential end of the notch overlap. Drive mechanism. In an optical disc apparatus that reads or records data by irradiating an optical disc with a laser beam,
An optical disc apparatus is a turntable on which the optical disc is placed when the optical disc is rotated,
A clamp for clamping the turntable and the optical disc;
A motor for rotating the optical disc;
A laminated core attached to the motor;
A clamper yoke attached to the turntable;
A clamper magnet fixed to the clamp and attracted to the clamper yoke by a magnetic force;
The optical disk drive mechanism according to claim 1, wherein the clamper yoke is formed by laminating a disk-shaped metal plate that is a central portion when a center of a core plate forming each layer of the laminated core is punched out. 4. The optical disk drive mechanism according to claim 3, wherein the disk-shaped metal plate is punched into different shapes depending on the layer to be laminated.

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