JP3395178B2 - Disk holding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk holding device, and more particularly to a disk holding device used for holding a disk on a disk deck. 2. Description of the Related Art Japanese Patent Laid-Open No. 61-240472 and Japanese Patent Laid-Open No. 6-96 are examples of such a disk holding device which can improve the detachability of a disk from a turntable.
No. 505, Japanese Patent Application Laid-Open No. 10-64147, and the like. In addition, it is assumed that magnetic force is used to hold the disk on the turntable.
85327 and JP-A-4-252457. [0003] Of those described in these publications, the one described in Japanese Patent Application Laid-Open No. 61-240472 is disclosed in Japanese Unexamined Patent Publication No. Sho 61-240472. However, there is a great possibility that the structure for moving the turntable up and down and the associated lock mechanism will be complicated. JP 1
In the structure described in Japanese Patent Application Laid-Open No. 0-64147, it is indispensable to use a plurality of small springs, so that the structure is likely to be complicated. On the other hand, the structure described in JP-A-6-96505 has a simple structure. [0004] However, those disclosed in these publications have a common problem that when a magnetic disk is required to be held using a magnetic force as in a mini disk (MD), the request cannot be dealt with. Have. On the other hand, the device disclosed in Japanese Patent Publication No. 7-85327 has a function of holding an MD or the like by using a magnetic force. However, after mounting the disk on the turntable, it is necessary to mount a chucking plate from above the disk, which is disadvantageous in terms of disk detachability. The one described in Japanese Patent Application Laid-Open No. 4-252457 has a similar problem. The present invention has been made under the above circumstances, and has as its object to provide a disk holding device which has a simple structure, is excellent in assemblability, and is inexpensive. Another object of the present invention is to provide a disk holding device which is excellent in disk detachability. Another object of the present invention is to provide a disk holding device having a function of holding an MD or the like using magnetic force. According to the present invention, there is provided a disk holding apparatus comprising: a turntable having a circular recess in a central portion; and a magnetic body to which a clamping plate provided on the disk is attached. And a cylindrical portion provided on the center plate is fitted in the recess.
It is, and, provided one engaged portion formed in a stepped shape on the side of the cylindrical wall and the recess of the peripheral wall of the cylindrical portion to the other side in
The cylindrical portion is held in the recess by being engaged with the engaging claw having elasticity provided therein, and the recess is
On the turntable concentric with the center of rotation of the turntable
Formed by the inner space of the formed annular ridge,
The center plate is connected to the upper opening edge of the cylindrical portion.
And the outer surface of the ridge is fitted outside the ridge.
It has a cover part that covers the whole, and
On the clamping plate
The ring that is
At a plurality of positions in the circumferential direction at equal angles,
Touching the ring part fitted to
Equipped with a pressing piece with elasticity that presses and aligns,
The clamping member made of a magnetic material is provided inside the cylindrical portion.
The magnet for sucking the rate is housed and held,
At the center of the bottom wall provided in the section, the above turntable
Equipped with a rotating shaft insertion part into which the tip of the penetrating rotating shaft is press-fitted
It is that it is. In this disk holding device, the disk is mounted on the turntable by mounting the disk with its clamping plate covering the center plate. Further, according to this disk holding device, the center plate is attached to the turntable by the engagement between the engaged portion formed in a stepped shape and the engagement claw. The mounting structure can be simply configured. Further, according to this disk holding device, when the disk-side clamping plate is attached to the cylindrical holding portion of the cover portion of the center plate, the ring portion of the clamping plate fitted to the holding portion is formed. It is pushed outward by the pressing piece of the holding portion and is aligned. for that reason,
Just by attaching the disk side clamping plate to the center plate, the disk will be positioned with the turntable aligned with the turntable,
Read errors and write errors due to eccentricity during disk rotation are less likely to occur. Further, according to this disk holding device, the disk holding device is provided with a function of holding an MD or the like using magnetic force. In this case, since the center plate is formed of a magnetic material , not only the magnet but also the center plate exerts a function of attracting a clamping plate such as an MD. Mounting stability is improved. [0014] Further, the cylindrical portion has a bottom wall,
At the center of the bottom wall, there is provided a rotating shaft insertion part into which the tip of the rotating shaft penetrating the turntable is press-fitted.
As a result, the center of rotation of the rotating shaft, the center of the center plate, and the center of the clamping plate of the disk can be aligned coaxially, so that reading errors and writing errors due to eccentricity during rotation of the disk are less likely to occur. . FIG. 1 is a longitudinal sectional view of a disk holding device according to the present invention, FIG. 2 is a plan view of a turntable 1, FIG. 3 is a plan view of a center plate 5, and FIG. IV-
It is sectional drawing which follows the IV line. In FIG. 1 and FIG.
Is a synthetic resin molded article having a circular shape in plan view, and has a circular concave portion 12 at the center. The recess 12 is formed by an inner space of an annular ridge 13 formed on the turntable 1 concentrically with the rotation center of the turntable 1. Engaged portions 14 are provided in a stepped manner at a plurality of locations at equal angular intervals in the circumferential direction of the ridge 13 corresponding to the peripheral wall of the recess 12. In the illustrated example, the engaged portion 14 has three groove portions 1 that are axially long at three locations on the inner peripheral surface of the ridge 13 at equal circumferential intervals.
5 is formed at the upper end of the ridge 13. The ridge 13 has a tapered surface 16 extending downward.
Is provided. Further, openings 17 are provided at a plurality of positions on the turntable 1 at equal intervals around the ridge 13. In FIGS. 1 and 2, the opening indicated by reference numeral 18 corresponds to a trace of a forming die formed when the engaged portion 14 is formed in a stepped shape. In FIGS. 1, 3 and 4, the center plate 5 has a tubular portion 51 at the center thereof.
A ring-shaped magnet 6 is housed and held inside 1, and upward engaging claws 52 are cut and raised at a plurality of positions (three positions in the example) at equal angles on the cylindrical wall of the cylindrical portion 51. Is formed. The cylindrical portion 51 has a bottom wall 53, and a rotary shaft insertion portion 54 into which the tip of the rotary shaft 7 described later is press-fitted is formed in a cylindrical shape at the center of the bottom wall 53. Further, the center plate has a cover portion 55 connected to the upper end opening edge of the tubular portion 51, and the cover portion 55 has an annular flat portion 56 around the upper end opening edge of the tubular portion 51. It has a downwardly expanding tapered inclined portion 57 connected to the outer peripheral edge of the flat portion 56, and a cylindrical wall 58 connected to the outer peripheral edge of the inclined portion 57. A cylindrical holding portion 59 is formed by the wall 58.
Then, elastic pressing pieces 61 are formed in a plurality of places (three places in the illustrated example) at equal angles of the cylindrical holding part 59 so as to protrude outward from the holding part 59 so as to be cut and raised.
As shown in FIG. 4, the pressing piece 61 is formed in a “U-shape” in which an intermediate portion 62 in the vertical direction originally protrudes outward.
Each of the intermediate portions 62 of the three pressing pieces 61 is separated by the same length from the center of the center plate 5 (the center line of the rotary shaft insertion portion 54). The center plate 5 is formed by drawing a magnetic material such as stainless steel. As can be seen in FIG. 1, the rotary shaft 7 driven by a rotary drive source (not shown) is inserted into the center hole 19 of the turntable 1 described with reference to FIG. 1 and appropriate means (for example, press-fitting,
Key means). Further, the cylindrical portion 51 of the center plate 5 is fitted into the recess 12 of the turntable 1, and the upper end of the rotating shaft 7 penetrating the center hole 19 of the turntable 1 into the rotating shaft insertion portion 54. It is press-fitted. Therefore, the center plate 5 is fixed to the rotating shaft 7 via a press-fit portion between the rotating shaft insertion portion 54 and the rotating shaft 7. Further, the cover 55 is fitted to the outside of the ridge 13, and the cover 55 covers the entire outer surface of the ridge 13. Further, each of the three engaging claws 52 on the center plate 5 side is separately attached to the three engaged portions 14 on the turntable 1 side so that the center plate 5 is not detached from the turntable 1. ing. Such an attached state is obtained by performing an operation of fitting the cylindrical portion 51 of the center plate 5 into the recess 12 of the turntable 1. That is, when the cylindrical portion 51 is fitted into the concave portion 12, the engaging claw 52 is deformed against its own elasticity, passes over the engaged portion 14, and then moves under the engaged portion 14. And engages with the engaged portion 14. Further, the engaging claw 52 is fitted into the groove portion 15 to prevent the relative rotation between the turntable 1 and the center plate 5. Since the center plate 5 having the shape shown in FIGS. 3 and 4 is formed by drawing as described above, the center plate 5 itself has a large strength. Therefore, when the center plate 5 is attached to the turntable 1, the center plate 5 is less likely to be deformed. The disc 100 shown in FIG. 1 is an MD, and a clamping plate 110 made of a magnetic metal is attached to the center of the disc 100. The clamping plate 110 has a ring portion formed by its peripheral wall. 1
20 are provided. In the above description, the mounting of the disc 100 on the turntable 1 only requires mounting the clamping plate 110 of the disc 100 on the center plate 5. By doing so, the clamping plate 1
Since the intermediate portion 62 of the three pressing pieces 61 of the holding portion 59 of the center plate 5 presses the ring portion 120 outward, the clamping plate 110 holds the center plate 5 concentrically. 1, and the rattling of the clamping plate 110 is prevented. When removing the disk 100 from the turntable 1, the clamping plate 110 of the disk 100 may be pulled out from the holding portion 59 of the center plate 5 upward. When the disc 100 is mounted on the turntable 1, not only does the magnet 6 attract the clamping plate 110 of the disc 100, but also the center plate 5 functions as a yoke for the magnet 6, so that the center plate 5 is also used. Clamping plate 1
Helps to aspirate 10. Therefore, the magnet 6
However, even if the suction action in that situation is weak, the entire suction action including the center plate 5 is large, and therefore, the mounting stability of the disc is improved. In this embodiment, the engaged portion 14 is
2, the engaging claw is provided on the cylindrical wall side of the cylindrical portion 51 of the center plate 5, but the engaging claw is provided on the peripheral wall side of the recess 12, and the engaged portion is provided on the center plate. 5
May be provided on the side of the cylindrical wall of the cylindrical portion 51. As described above, according to the present invention, although the structure is simple, the assemblability is excellent, and the price is low,
It is possible to provide a disk holding device which is excellent in disk attaching / detaching property and further has a function of holding the MD or the like with stability using magnetic force.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a disk holding device according to the present invention. FIG. 2 is a plan view of a turntable. FIG. 3 is a plan view of a center plate. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3; DESCRIPTION OF SYMBOLS 1 turntable 5 center plate 6 magnet 12 recess 13 ridge 14 engaged portion 51 cylindrical portion 52 engaging claw 53 bottom wall 54 rotating shaft insertion portion 55 cover portion 58 cylinder wall 59 holding portion 61 Pressing piece 100 Disc 110 Clamping plate 120 Ring part

Claims (1)

(57) [Claim 1] A turntable having a circular concave portion in the center portion, and a center plate made of a magnetic material on a disk side to which a clamping plate is attached is provided. And
The cylindrical part of the center plate fits into the recess
It engaged, and, while engaged portion formed in a stepped shape on the side of the cylindrical wall and the recess of the peripheral wall of the cylindrical portion to the other side in
The cylindrical portion is held in the recess by being engaged with the provided elastic engaging claw, and the recess is concentric with the rotation center of the turntable.
Inner space of the annular ridge formed on the turntable
The center plate is formed by the cylindrical
Connected to the upper edge of the upper end of the
Having a cover part integrally covering the entire outer surface of the ridge,
The above-mentioned clamp is attached to the cylindrical holding part of the cover.
The ring part of the ping plate is removable.
And a plurality of circumferential directions at equal angles of the holding part
In contact with the ring part fitted to the holding part
Equipped with elasticity that presses the ring outward and aligns
It is made of a magnetic material inside the cylindrical part.
Housed in a magnet that sucks the clamping plate
The turntable is held at the center of the bottom wall provided in the cylindrical portion.
Rotary shaft inserted with the tip of the rotary shaft pressed through the cable
A disk holding device characterized by comprising a section .