JPS63193392A - Disk device - Google Patents

Abstract

PURPOSE:To maintain the fitting accuracy of a metal plate at the inside of a disk hub, with high accuracy by engaging the engaging projecting piece of the metal plate to the engaging part to be engaged of the metal plate supporting member by turning the metal plate to a prescribed fitting direction and fitting the metal plate to the metal plate supporting member on a disk substrate. CONSTITUTION:The disk shaped metal plate 5 provided with the plural engaging projecting pieces 4 formed around its edge party by a joggling work, is rotated in the prescribed direction against the metal plate supporting member 8, and owing to that the engaging projecting pieces 4 of the metal plate 5 are engaged to the engaged part 7 of the metal plate supporting member 8, the metal plate 5 is fitted and engaged to the metal plate supporting member 8 on the disk substrate 1. Thus, the fitting position accuracy and the fitting strength of the metal plate 5 at the inside of the metal plate supporting member 8 are improved, and the metal plate 5 at the inside of the disk hub 2 can be positioned while a constant gap is always retained.

Description

Detailed Description of the Invention <Field of Industrial Application> The present invention relates to a disk device such as an optical disk commonly used in a magnetic clamp type recording and/or reproducing device, and in particular to a disk device such as an optical disk that is attracted and supported by a magnet of a disk rotation drive device. The present invention relates to a disk device having a disk hub at its center.

<Summary of the Invention> The present invention relates to a magnetic clamp type disk device, which includes a disk-shaped metal plate having a plurality of engaging protrusions formed by processing steps on the edge thereof, and a center spindle. and a metal plate support member made of synthetic resin having a central hole that engages with the metal plate and an engaged portion that engages with the engagement protrusion on the edge of the metal plate; The metal plate is rotated in a predetermined direction with respect to the metal plate support member, and the engaging protrusion of the metal plate is engaged with the engaged portion of the metal plate support member, whereby the metal plate is mounted on the disk substrate. By attaching the metal plate to the metal plate support member to which it is fixed, the metal plate can be attached within the disk hub with high accuracy, and the magnetic attraction force of the magnet of the disk rotation drive device is not impaired. It is something to do.

<Prior Art> Disc devices such as optical discs have been known as recording media for information signals.

In a recording and/or reproducing device that uses this disk device as a recording medium, the disk device is rotated at an extremely high speed of several hundred revolutions to over a thousand revolutions per minute, and the recording surface of the disk device is Recording and/or reproducing operations are performed by irradiating with a laser or the like. In order to ensure high-speed rotation of this disk device, a clamping means is provided that allows the disk device to be integrally coupled to a disk rotation drive device that rotates at high speed.

As a means for clamping this disk device to the disk rotation drive device, a magnet is provided on the disk rotation drive device side, and a disk hub having a magnetic metal plate in the center is attached to the disk device side. A so-called magnetic clamp type clamping means has been proposed, which holds the disk device integrally with the disk rotation drive device by magnetically attracting a metal plate with the magnet.

By the way, in a disk device commonly used in this magnetic clamp type disk rotation drive device, it is necessary to attach a metal plate for clamping to a disk hub attached to the center of the disk device as described above. Therefore, the disk hub includes a support member for fixing to the disk substrate and a magnetic metal plate for clamping.

However, since the supporting member needs to be fixed to the disk substrate, it is made of synthetic resin and its material is different from that of the metal plate. Therefore, due to the difference in these materials, the heat shrinkage coefficients of the support member and the metal plate also differ. Therefore, when a disk hub is constructed by integrally attaching a metal plate to the support member by molding such as outsert or insert molding, this disk hub is attached to the center of the disk substrate of the disk device by ultrasonic welding or the like. In the case of adhering, the support member and the metal plate have different heat shrinkage coefficients due to the difference in heat shrinkage coefficients, so there is a risk that extra stress will be generated on the disk substrate during welding, distorting the surface of the disk substrate. There is. This distortion on the surface of the disk substrate causes birefringence in the laser beam that enters and is reflected on the disk substrate during recording and/or reproduction in this disk device, causing errors in reading and writing information signals.

Therefore, as mentioned above, in order to prevent distortion of the disk surface that causes birefringence of the laser beam, the disk hub fixed to the disk substrate is constructed as a separate support member and a metal plate, and the support member is made of metal. There are some that allow you to attach a board.

As a disk device commonly used in such a magnetic clamp type disk rotation drive device, the one shown in FIG. 5 is known.

In the disk device shown in FIG. 5, a disk hub 52 for mounting on the disk rotation drive device is attached to the center of a disk substrate 51 having a center hole 5°. This disk hub 52 is fixed to the center of the disk substrate 51, and a center spindle 53 of a disk rotation drive device that rotationally drives this disk device.
Metal plate support member 5 having a spindle hole 54 that engages with
5, and a metal plate 56 for clamping that is attached to the metal plate support member 55. A locking piece 57 is formed on the metal plate 56. This locking piece 57 is formed by shearing a part of the surface facing the metal plate 56ρ magnet into a substantially U-shape by punching or the like, and then bending the inner piece of the part toward the lower surface by bending or the like. be. Further, the locking piece 5 is provided in the metal plate storage 58 of the metal plate support member 55.
A locking hole 59 for engaging and locking the locking piece 57 is provided at a position opposite to the locking hole 57, respectively.

Therefore, the metal plate 56 is inserted by inserting the locking pieces 57 into the locking holes 59 in the metal plate support member 55 provided at corresponding positions and rotating the gold plate 56 in the locking direction. It can be attached by integrally engaging and locking with the metal plate support member 55.

The disk device configured as described above is
As shown in FIG. 6, a center spindle 53 that rotates integrally with the disk table 60 of the disk rotation drive device is engaged with the spindle hole 54 of the metal plate support member 55 constituting the disk hub 52, and the center spindle 53 rotates integrally with the disk table 60 of the disk rotation drive device. will be installed on the

Furthermore, a magnet 61 is disposed on the disc table 60 at a position corresponding to the metal plate 56 in the disc hub 51 and faces the metal plate with a slight gap g. By magnetically attracting the metal plate 56 attached to the disk hub 51 with the magnet 61, the disk device can be rotated integrally with the rotation of the center spindle 53 of the disk rotation drive device. . In addition, as mentioned above, the metal f! The reason why a slight gap g is provided between the metal plate 56 and the magnet 610 is that when the magnet 61 completely attracts the metal plate 56, this disk device can be attached to the disk table 6.
This is because when removing from 0, it becomes difficult to remove.

Note that when the disk device is installed in the disk rotation drive device, the non-recording portion on the inner circumferential side of the disk substrate 51 comes into contact with the mounting reference surface 62 of the disk table 60 to determine the mounting position of the disk device. will be done.

<Problems to be Solved by the Invention> By the way, when the disk drive is rotationally driven by the disk rotation drive device, unless integral rotation of the center spindle and the disk drive is guaranteed, the rotational speed and rotation of the disk drive will be affected. Unable to control quantity. Therefore, it is necessary to sufficiently magnetically attract the disk device with the magnet so as to prevent the disk device from slipping on the disk table and to integrate the disk device. However, if the magnetic attraction is too strong, it will not be possible to easily remove the disk drive from the disk table when taking it out (sometimes the disk hub will come off from the disk board due to the attraction force of the magnet, and only the disk board will be taken out). Sometimes it happens.

Therefore, the magnetic attraction force of the magnet must be able to prevent the disk device from slipping and to allow easy removal of the disk device from the disk table. Therefore, in addition to selecting the magnetic attraction force of the magnet, it is required that the positional accuracy of the metal plate in the disk hub with respect to the magnet be maintained sufficiently, and that the gap be always maintained at a constant distance.

However, as described above, a locking piece is provided on the metal plate by punching, bending, etc., and this locking piece is engaged with the locking hole of the disk hub to insert the metal plate into the disk hub. For those that are fixed to the metal plate, the locking piece is formed by bending a part of the metal plate by bending, etc., so the bending angle may vary due to so-called springback etc. that occurs during this bending process. , it is not possible to keep the bending accuracy of this locking portion constant. Therefore, on the disk table, it is difficult to maintain the height position of the metal plate relative to the disk substrate, which serves as the mounting reference surface, within the allowable dimensional tolerance, and it is not possible to sufficiently guarantee the positional accuracy of the metal plate. .

Further, the locking piece of the metal plate is formed by punching out a part of the surface facing the magnet of the metal plate, and this locking piece is engaged with the locking hole of the disc hub. In some parts, the metal plate and the magnet cannot face each other, which causes the attraction force of the magnet to decrease.

Therefore, the present invention solves the above-mentioned problems, maintains high precision in mounting the metal plate, and is compatible with the magnetic clamp method in which a disk hub is attached without impairing the magnetic attraction force of the magnet. The purpose is to provide a disk device that can

<Means for Solving the Problems> In order to solve the above-mentioned problems and achieve the above-mentioned objects, the present invention provides a plurality of engaging protrusions formed by processing steps at the edge portions. A metal made of a synthetic resin, which has a circular disk-shaped metal plate, a central hole that engages with a center spindle, and an engaged portion that engages with an engaging protrusion on an end edge of the metal plate. The engaged portion of the metal plate support member includes a regulating portion that restricts the amount of rotation in the direction in which the metal plate is attached, and a restriction portion that limits the amount of rotation in the direction in which the metal plate is attached. A blocking portion is provided to prevent the metal plate from being attached to the metal plate support member in a predetermined direction, and the engagement protrusion of the metal plate is rotated in a predetermined direction to prevent the engagement protrusion of the metal plate from being engaged with the metal plate support member. The metal plate is attached to a metal plate support member that is fixed onto the disk substrate by engaging with the disk substrate.

<Function> In the present invention, a disc-shaped metal plate provided with a plurality of engaging protrusions formed by step processing on the edge thereof is attached to the metal plate support member in a predetermined direction. The metal plate is engaged and locked to the metal plate support member on the disk substrate by rotating the engaging protrusion of the metal plate to the engaged portion of the metal plate support member. The mounting of the metal plate within the metal plate supporting member can improve the positional accuracy and the mounting strength.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The disk device according to the present invention is applied to an optical disk, and is constructed by attaching a disk hub 2 to the center of a disk substrate 1 for clamping the optical disk to a disk rotation drive device.

The disk substrate l is formed of synthetic resin such as polycarbonate, glass material, etc. into a disk shape, and
It is constructed by bonding two disk substrates 1 on which recording layers are formed back to back with a reflective film in between, and is capable of double-sided recording and/or recording.
Or it is commonly used as an optical disc for reproduction.

A center hole 3 is bored in the center of the disk substrate 1.

As shown in FIGS. 1 and 2 A and B, the disk hub 2 attached to the center of the disk substrate 1 described above has a stepped edge and a plurality of engaging protrusions 4. The metal plate 5 has a spindle hole 6 in which a center spindle that is fixed on the disk substrate 1 and rotates the disk engages, and further has a spindle hole 6 in which a center spindle that rotates the disk is engaged. □It is constructed with the engaging piece 4 and a metal plate support member 8 made of synthetic resin provided with an engaged portion 7 to be engaged as the main components.

The metal plate 5 is formed into a disk shape as shown in FIG. 4A, and the spindle hole peripheral wall 1 forms the peripheral wall of the spindle hole 6 formed in the metal plate support member 8 at the center of the circle.
A center hole 9 is bored with a diameter that allows a diameter of 0 to fit thereinto. Further, this metal plate 5 is provided with a first stepped portion 11 formed in a half-opened state as shown in FIG. 4B by processing the metal plate 5 on the outer peripheral side. A plurality of engagement protrusions 4 are provided on the outer peripheral side of the first stepped portion 11 so as to protrude through a second stepped portion 12 which is formed in a half-opened state by machining.

In this way, the engaging protrusion 4 is connected to the first and second stepped portions 11 .
12, so even if a thin material such as the metal plate is used, the engaged portion 7, which will be described later,
It is possible to form a step large enough to engage the engaged piece 14, and to maintain sufficient strength in the connecting portion between the step portions. Further, since a spring bag does not occur as in the case of bending, it is possible to precisely adjust the step size of the locking piece 4.

Furthermore, in the first stepped portion 11 of the metal plate 5,
A positioning protrusion (not shown) of the jig arm when attaching the metal plate 5 to the metal plate support 8.

) are provided with a plurality of jig insertion holes 15 that are engaged with each other.

When attaching the metal plate 5 to the metal plate support member 8, the metal plate 5 is automatically assembled by adsorbing the metal plate 5 with a magnet attached to the tip of the jig arm for operation. 5 is generally attached to the metal plate support member 8, but it is difficult to position the metal plate 5 only by adsorption using the magnet, and the engaging protrusion 4 of the metal plate 5 is attached to the metal plate support member 8. It is not easy to correspond to the engaged portion 7. Therefore, the jig insertion hole 15 is provided in the metal plate 5, and the holding position of the metal plate 5 is determined by fitting the jig arm into the jig insertion hole 15 of the metal plate 5. This makes it easy to engage the engaging protrusion 4 of No. 5 with the engaged portion 7 of the metal plate support member 8.

Next, the metal plate support member 8 is formed by molding a synthetic resin into a flat cylinder as shown in FIGS. 3A-C.
A spindle hole 6 is bored in the center of the circle, into which a center spindle of a disk rotation drive device engages. The spindle hole 6 is surrounded by a spindle hole peripheral wall 10 on the main surface side of the metal plate support member 8, and a spindle guide inclined surface 13 is provided on the spindle insertion side of the spindle hole peripheral wall 10.

The metal plate storage portion 18 is formed on the outer periphery of the spindle hole peripheral wall 10 on the main surface side of the metal plate support member 8. That is, the first groove formed on the main surface side from the outer peripheral part of the spindle hole peripheral wall 10 on the main surface side of the metal plate support member 8 to the rising wall 19 formed on the outer peripheral side edge of the metal plate support member 8 The recessed portion serves as the metal plate storage portion 18.

Furthermore, a second recess 20 is provided on the rising wall 19 side of the metal plate storage section 18. This is to accommodate the first stepped portion 11 provided on the outer peripheral side of the metal plate 5.

Furthermore, engaged portions 7 are provided on the rising wall 19 at positions corresponding to the engaging protrusions 4 of the metal plate 5, respectively.

The engaged portion 7 is provided by cutting out a part of the rising wall 19 as shown in FIGS. 3A-D, and is an insertion portion into which the engaging protrusion 4 of the metal plate 5 is inserted. 21, and an engaged piece 14 that engages and locks the engaging protrusion 4 of the metal plate 5. . The engaged pieces 14 are provided in the same circumferential direction from the insertion portion 21 in each engaged portion 7 .

Then, the engaging protrusion 4 of the metal plate 5 of the engaged piece 14
A blocking portion 23 is provided at the leading end of the engaging protrusion 4, which has a tapered surface 22 that guides the engaging protrusion 4 described below and prevents the engaging protrusion 4 from rotating in the return direction once engaged. Furthermore, a regulating wall 24 is provided on the proximal end side of the engaging protrusion 4 for regulating the amount of rotation of the engaging protrusion 4 on the entry side. Note that a hole 24 is formed on the lower surface side of the engaged piece 14 as a hole in the mold for molding the engaged piece 14 when molding the metal plate support member 8. .

Therefore, after the engaging protrusion 4 of the metal plate 5 is inserted into the insertion portion 21, the metal plate 5 is attached to the metal plate support member 8 in a predetermined direction, as shown in FIG. 2 in this example. By rotating in the direction of arrow a in A, the engaging protrusion 4 of the metal plate 5 can be engaged with the engaged piece 14 formed on the engaged portion 7 of the metal plate support member 8. The metal plate 5 is attached within the metal plate support member 8 on the disk substrate 1.

Metal plate support portion 8 of the disk hub 2 configured as described above
is attached to the periphery of the center hole 3 of the disk substrate 1 by welding or gluing so that the center of the optical disk is aligned with the center of the spindle hole 9 of the disk hub 2. In addition, when this metal plate support member 8 is welded to a disk substrate l made of synthetic resin by ultrasonic welding means, etc., a melting point is applied to the lower surface side of this metal plate support member 8 to concentrate the ultrasonic waves during welding. Ribs 26 may also be provided.

Then, the engaging protrusion 4 of the metal plate 5 is engaged with the engaged portion 7 of the metal plate support member 8 on the disk substrate 1, and the metal plate 5 is integrally attached to the metal plate support member 8. By attaching it, a disk device to which the disk hub 4 having the metal plate 5 is attached is constructed.

<Effects of the Invention> According to the present invention, a disc-shaped metal plate provided with a plurality of engaging protrusions whose edges are stepped and formed by processing is placed in a predetermined position with respect to the metal plate support member. The metal plate is attached to the metal plate support member on the disk substrate by rotating the metal plate in the direction and engaging the engaging protrusion of the metal plate with the engaged portion of the metal plate support member. Therefore, it is possible to improve the positional accuracy and the strength of the mounting of the metal plate within the metal plate support member. Therefore, the metal plate in the disk hub of the disk device facing the magnet disposed in the disk table of the disk rotation drive device can be positioned with a constant gap at all times, and the magnetic attraction force of the magnet can be To reliably mount a disk device integrally to a disk rotation drive device without damaging it.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a disk device according to the present invention. FIG. 2A is a plan view of a main part showing the mounting state of a disk hub of a disk device according to the present invention, and FIG. 2B is a sectional view taken along the line A--A. Figure 3A is a plan view showing the metal plate mounting member;
FIG. 3B is a bottom view of the same, FIG. 3C is a sectional view taken along the line B--B of FIG. 3A, and FIG. 3 is a sectional view taken along the line C--C of FIG. 3B. Fig. 4A is a plan view showing the metal plate, and Fig. 4B is a plan view showing the metal plate.
It is a sectional view taken along the line DD in Figure A. FIG. 5 is an exploded perspective view showing a conventional disk device.
FIG. 6 is a reference sectional view showing a state in which a conventional disk removal device is attached to a disk rotation drive device. 1...Disc substrate 2...Disc hub 4...Engaging protrusion 5...Metal plate 6...Spindle hole 7...Engaged portion 8...Metal plate support member 14. ...Engaged piece 21...Insertion hole 23...Block part 24...Restriction wall

Claims (1)

[Scope of Claims] A disc-shaped metal plate provided with a plurality of engaging protrusions formed by step processing on the edge thereof, and a central hole in which a center spindle engages, and the metal plate and a metal plate support member made of synthetic resin, which is provided with an engaged part that is engaged with the engaging protrusion on the end edge of the metal plate. A regulating part that regulates the amount of rotation in the mounting direction and a blocking part that prevents the metal plate from rotating in a direction opposite to the mounting direction are provided, and the metal plate is mounted in a predetermined mounting direction with respect to the metal plate support member. The metal plate is attached to a metal plate supporting member which is fixed on the disk substrate by rotating the engaging protrusion of the metal plate to the engaged portion of the metal plate supporting member. disk device.