JP2553758B2 - Disk drive - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device that rotationally drives a disk such as a compact disk (CD).

2. Description of the Related Art A conventional disk drive device includes a turntable fixed to a rotation shaft of a motor, a clamp member including a magnet that holds a disk between the turntable, and a surface of the turntable facing the clamp member. A metal plate provided is provided, and the disc is held by the attraction force of the metal plate and the magnet.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, since the rotating shaft of the motor used in the above-mentioned conventional disk drive device has play in the thrust direction and the radial direction, the followability of the optical pickup is deteriorated particularly when vibration is applied. There was a problem.

The present invention is to solve the above conventional problems,
An object of the present invention is to prevent backlash in the thrust direction of the motor rotating shaft, or to prevent deterioration of the followability of the optical pickup due to backlash in the thrust direction and radial direction of the motor rotating shaft.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention according to claim 1 of the present invention is directed to a motor which is fixed by bringing a top surface of a casing into contact with a substrate, and a rotating shaft of the motor. A turntable fixed to the motor, a magnet fixed to the surface of the turntable on the motor side, and a clamp member for holding the disc between the tentable and a surface of the clamp member facing the turntable. It is characterized by including the metal plate.

According to a second aspect of the present invention, a hole is formed in the substrate by removing substantially half of the contact portion between the substrate and the upper surface of the motor case, and the magnet and the motor facing each other through the hole are formed. It is characterized in that a difference is generated between the attractive force between the magnet and the substrate and the attractive force between the upper surface of the casing.

Action Therefore, according to the first aspect of the present invention,
A playtable in the thrust direction of the motor rotation shaft is absorbed by the attraction force generated between the magnet fixed to the table side surface of the turntable and the substrate to which the motor is fixed, and the turntable to which the magnet is fixed, The attraction force by the magnet acts between the clamp member and the metal plate, and the attraction force holds the disc.

Further, according to the second aspect of the present invention, since a hole is formed in the substrate by removing substantially half of the contact portion between the substrate and the upper surface of the motor housing, the holes face each other through the hole. Since there is a difference between the attractive force between the magnet and the upper surface of the housing of the motor and the attractive force between the magnet and the substrate, the play in the thrust direction and the radial direction of the motor rotation shaft can be absorbed. It is a thing.

Example One example of the present invention will be described below. Figure 1,
In FIG. 2, reference numeral 1 is a substrate made of a metal plate such as iron, and a hole 2 is formed in this substrate 1. Reference numeral 4 is a motor fixed to the back surface of the substrate 1 with screws 5. Reference numeral 6 denotes a rotation shaft of the motor 4, and the rotation shaft 6 penetrates the hole 2 of the substrate 1 and projects upward. Reference numeral 7 denotes a turntable fixed to the rotary shaft 6. A protrusion 7a is integrally formed at the center of the upper surface of the turntable 7, and a concave groove 7b is formed on the upper surface of the protrusion 7a. 8 is a ring-shaped magnet attached to the lower surface of the turntable 7, 9 is a clamp member, and a protrusion 9a that can be inserted into the concave groove 7b of the turntable 7 is formed at the center of the lower surface of the clamp member 9. ing. 9b is an annular groove formed on the outer peripheral portion of the protrusion 9a of the clamp member 9, and an annular metal plate 10 such as an iron plate is fixed to the annular groove 9b. Reference numeral 11 is a support plate that rotatably supports the clamp member 9.

In FIG. 1, the disk 12 is placed on the upper surface of the turntable 7 while the support plate 11 is moving upward. At this time, the center hole 12a of the disk 12 is fitted into the protrusion 7a of the turntable 7, and the disk 12 is aligned. Here, when the support plate 11 is moved downward, the protrusion of the clamp member 9
9a is inserted into the concave groove 7b of the turntable 7. On this occasion,
Since an attractive force acts between the metal plate 10 and the magnet 8, the clamp member 9 is attracted toward the turntable 7. Therefore, the disk 12 is held between the upper flat portion of the turntable 7 and the lower flat outer portion of the clamp member 9. When current is supplied to the motor 4 in this state, the rotating shaft 6
Rotates, and the turntable 7 rotates. Therefore, the disc 12 pressed against the turntable 7 by the clamp member 9 rotates together with the turntable 7, and the disc 12 is rotated.
The playback operation is performed.

In the above embodiment, the ring-shaped magnet 8 is provided on the back surface of the turntable 7 and the metal plate 10 is provided on the clamp member 9. Therefore, the clamp member 9 can be attracted to the turntable 7. 8
The disk 12 can be held by the suction force of. Also magnet 8
The turntable 7 is attracted toward the motor 4 as a result of the attraction force acting between the substrate 1 and the substrate 1 and between the magnet 8 and the housing of the motor 4. Therefore, the rotating shaft 6 of the motor 4
The play in the axial direction (thrust direction) is prevented.

3 and 4 show another embodiment of the present invention.
The substrate 1 of this embodiment is different from the substrate 1 of the above embodiment in that a semicircular hole 2 in the substrate 1 and a recess 3 are formed in the hole edge portion of the hole 2. The rotating shaft 6 of the motor 4 projects to the upper surface side of the substrate 1 via the recess 3 of the substrate 1. The motor 4 can be inserted from the front surface side to the back surface side of the substrate 1 through the semicircular hole 2 of the substrate 1.

In this embodiment, since almost half of the upper surface of the housing of the motor 4 is fixed in contact with the substrate 1, the attractive force (X) between the magnet 8 and the upper surface of the housing of the motor 4 and the substrate 1 There is a difference in the attractive force (Y) between the magnet and the magnet 8. Therefore, according to the present embodiment, the rotary shaft 6 in the above embodiment is used.
Not only the backlash in the thrust direction, but also the suction force (X)
The play between the rotary shaft 6 and the rotary shaft 6 in the radial direction is absorbed by the difference between (1) and (Y).

As described above, according to the above-described embodiment, the attraction force of the magnet 8 can be used for holding the disk 12 and preventing the play of the rotating shaft 6 of the motor 4 in the thrust direction and the radial direction.

EFFECTS OF THE INVENTION The present invention has the above-described configuration, and since the turntable is attracted to the motor side by the attraction force of the magnet fixed to the turntable, the play in the thrust direction of the motor rotation shaft is absorbed. In addition, since the attraction force of the magnet works between the turntable to which the magnet is fixed and the clamp member to which the metal plate is fixed, there is an advantage that the disk can be held by the attraction force of the magnet. Further, when the motor is structured to be supported by a part of the substrate as in the embodiment shown in FIGS. 3 and 4, it is possible to prevent the play of the motor rotation shaft in the radial direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a disk drive device according to an embodiment of the present invention, FIG. 2 is a top view of a part of the device, and FIG. 3 is a view of another embodiment of the present invention. A sectional view and FIG. 4 are partial top views of the same apparatus. 1 ... Substrate, 2 ... Hole, 3 ... Recess, 4 ... Motor, 5
...... Screws, 6 ...... Rotation axis, 7 ...... Turntable, 8 ...
… Magnet, 9… Clamping member, 10… Metal plate, 1
1, ... Support plate, 12 ... Disc.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Kawada 4-3-1 Tsunashima East, Kohoku Ward, Yokohama City, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd. 4-3-1 Matsushita Communication Industrial Co., Ltd. (72) Inventor Masahiro Watanabe 4-3-1 Tsunashima East, Kohoku Ward, Yokohama City, Kanagawa Matsushita Communication Industrial Co., Ltd.

Claims (2)

(57) [Claims] 1. A motor fixed to a substrate by contacting the upper surface of its housing, a turntable fixed to a rotation shaft of the motor, and a magnet fixed to a surface of the turntable on the motor side. A disk drive device comprising: a clamp member for sandwiching a disk with the turntable; and a metal plate provided on a surface of the clamp member facing the turntable. 2. A hole is formed in the substrate by removing substantially half of a contact portion between the substrate and the upper surface of the motor casing, and attraction between the magnet and the upper face of the motor casing opposed through the hole. 2. The disk drive device according to claim 1, wherein a difference is generated between the force and the attraction force between the magnet and the substrate.