JPH0356062A - Motor fitted with turn table - Google Patents

Abstract

PURPOSE:To prevent life deterioration by planting an earth brush in contact with a turn table in a mounting flange. CONSTITUTION:For a motor fitted with turn table, a rotary shaft 6 is supported freely in rotation by bearings 7 provided at a mounting flange 5, and a photodisc 11 is positioned at the rotary shaft 6, and it rotates. A turn table 2b is fixed to this rotary shaft 6, and a ring-shaped magnet 4 for clamping is fixed to this table 2b. Furthermore, a rotor 2a is arranged below the bearing, and a ring-shaped magnet 3 is fixed to this. And a conductive earth brush 12 is planted in the mounting flange 5, and the top contacts with the turn table 2b, whereby it earths the potential of the photodisc 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a motor with a turntable used for rotating a disk.

[Conventional technology]

FIG. 2 is a side sectional view showing the structure of a conventional motor with a turntable. In the figure, 11 is an optical disc made of resin, and the optical disc 1l has a hole in the center, and below the hole is a disc with a hole in the center, and the outer diameter is larger than that of the hole. A hub 10 made of a shaped magnetic material is fixed concentrically. The rotation shaft 6 of the motor is inserted into the center hole of the hub 10.
The protruding end of the optical disc 11 is inserted through the optical disc 11.
is being positioned. The rotating shaft 6 is rotatably supported by a mounting flange 5 having a cylindrical boss portion erected at its center via bearings 7, 7 fitted inside the boss portion.

Further, a shallow dish-shaped turntable 2b is externally fitted and fixed to the upper part of the bearing 7 on the protruding end side of the rotary shaft 6, and the optical disc l1 is placed on the upper part. An annular clamping magnet 4 is fixed to a portion approximately half the radius on the turntable 2b, and its magnetic force attracts the hub 10 of the optical disk l1, thereby clamping the optical disk 11 to the turntable 2b.

A deep dish-shaped rotor 2a having a boss portion at the center is externally fitted and fixed to the lower part of the bearing 7 on the opposite side to the protruding end of the rotating shaft 6, and a cylindrical magnetoresistive member 3 is fixed to the inner circumferential surface of the rotor 2a.

On the other hand, the outer periphery of the mounting flange 5 is fastened to a mounting base 9 of an optical disk drive (not shown), and a stator 1 having a coil wound around it is fitted into the outer periphery of the boss portion facing the magneto 3. Further, a lead wire 8 for passing current through the coil is taken out from the stator 1 to the outside.

In the conventional motor with a turntable configured as described above, the rotor 2a is rotated by applying a pulse current to the stator 1 from the lead wire, which is transmitted to the turntable 2b via the rotating shaft 6. Rotate the optical disk drive 1.

[Problem to be solved by the invention]

Rotating parts such as the turntable 2b and rotor 2a of a conventional motor with a turntable and fixed parts such as the mounting flange 5 and the stator 1 are electrically insulated, but structurally they are in contact with each other through a bearing 7.

On the other hand, the optical disk 11 is made of plastic or resin, and may be charged due to friction with air, and the potential thereof may be several thousand volts. The charged optical disc 11 is placed on the turntable 2.
When placed on the mounting flange 5, the potential flows through the bearing to the mounting flange 5 and is grounded. At that time, there is a possibility that the oil film of the bearing 7 will be destroyed, resulting in a shortened lifespan and failure of the bearing.

Furthermore, when the optical disk 11 is charged, dust in the air will adhere to it.
The dust may cause errors during recording and playback.

This invention was made in view of the above circumstances, and by arranging a fibrous earth brush on the motor mounting flange so as to be in contact with the turntable, the potential of the optical disk can be grounded without going through the bearing, and the bearing can be grounded. It is an object of the present invention to provide a motor with a turntable that prevents deterioration of the service life, removes the potential of an optical disk, and reduces the adhesion of dust.

[Means to solve the problem]

A motor with a turntable according to the present invention is provided with a conductive member that is attached to one of the turntable and the mounting flange, contacts the other, and makes them electrically conductive.

[Effect]

In this invention, when a charged optical disk is mounted on a turntable, its potential is grounded via the mounting flange via the conductive member.

〔Example〕

FIG. 1 is a side sectional view showing the structure of a motor with a turntable according to the present invention. In the figure, 1l is an optical disc made of resin, and the optical disc 1l has a hole in the center, and below the hole is a disk with an outer diameter larger than the diameter of the hole. A hub 10 made of a shaped magnetic material is fixed concentrically. The protruding end of the rotary shaft 6 of the motor is inserted through a hole in the center of the hub 10, and the optical disc 11 is thereby positioned. The rotating shaft 6 is rotatably supported by a mounting flange 5 having a cylindrical boss portion erected at its center via bearings 7, 7 fitted inside the boss portion.

Further, a shallow dish-shaped turntable 2b is externally fitted and fixed to the upper part of the bearing 7, which is an example of a protruding end of the rotary shaft 6, and an optical disc 11 is placed on the upper part of the turntable 2b. An annular clamping magnet 4 is fixed to a portion approximately half the radius on the turntable 2b, and its magnetic force attracts the hub 10 of the optical disk 11, thereby clamping the optical disk 11 to the turntable 2b.

A fibrous conductive grounding plastic 12 serving as a conductive member is planted on the surface of the mounting flange 5 facing the turntable 2b, and its tip is in contact with the turntable 2b.

A deep dish-shaped rotor 2a having a boss portion at the center is externally fitted and fixed to the lower part of the bearing 7 on the opposite side to the protruding end of the rotating shaft 6, and a cylindrical magnetoresistive member 3 is fixed to the inner circumferential surface of the rotor 2a.

On the other hand, the outer peripheral portion of the mounting flange 5 is fastened to a mounting head 9 of an optical disk drive device (not shown), and a stator 1 having a coil wound thereon is fitted into the outer peripheral surface of the boss portion facing the magneto-resonator 3. Further, a lead wire 8 for passing current through the coil is taken out from the stator 1 to the outside.

In the turntable-equipped motor of the present invention constructed as described above, when the charged optical disk 11 is placed on the turntable 2b, its hub 10 is attracted and fixed to the clamping magnet 4. The potential of the optical disc 11 is then transmitted to the mounting flange 5 via the turntable 2b and the grounding brush 12 and grounded. Further, by applying a pulse current to the stator 1 from the lead wire, the rotor 2a is rotated, which is transmitted to the turntable 2b via the rotating shaft 6.
Even when the optical disc 11 is rotated by being transmitted to the ground, the grounding brush l2 is always in contact with the turntable 2b, so the optical disc l1 is not charged and dust is prevented from adhering.

In this embodiment, the earth brush is installed on the mounting flange, but it goes without saying that the earth brush may be installed on the turntable.

Further, although a fibrous earth brush is used as the conductive member, the present invention is not limited to this, and any conductive member may be used as long as it can conduct the turntable and the mounting flange.

〔Effect of the invention〕

As explained above, in this invention, by planting a grounding brush in contact with the turntable on the mounting flange, the electric potential from the charged optical disk is grounded without passing through the bearing, thereby preventing damage to the bearing. This prevents deterioration of the service life and prevents the optical disc from becoming charged.
It has excellent effects such as reducing dust adhesion and reducing errors during recording and reproduction.

[Brief explanation of drawings]

FIG. 1 is a sectional side view showing the structure of a motor with a turntable according to the present invention, and FIG. 2 is a sectional side view showing the structure of a conventional motor with a turntable. 2b... Turntable 5... Mounting flange 1
2... Earth brush In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1) A motor with a turntable, comprising a turntable on which a disk medium for recording information is mounted, and a mounting flange facing the turntable and for attaching it to a frame, comprising: Alternatively, a motor with a turntable characterized in that a conductive member is attached to one of the mounting flanges and comes into contact with the other to bring them into electrical continuity.