JPS5967845A - Motor with brush for disk record player - Google Patents

Abstract

PURPOSE:To suppress the adverse influence of the vibration of a rotational shaft to the read-out of digitized data with a simple structure by disposing a pair of brushes substantially perpendicular to the moving direction of a pickup. CONSTITUTION:A pair of brushes 26 are disposed substantially perpendicularly to the moving direction of a pickup 29. According to this structure, the compliance of the tracking direction of a rotational shaft is improved. Accordingly, the vibration of the shaft in the tracking direction can be rapidly suppressed. The vibration of the shaft in a linear speed diretion can be rapidly suppressed since an oil film is already formed on the contacting part between the shaft and bearing at the normal rotation time and braking is applied.

Description

[Detailed description of the invention] [Technical field of torture] This invention is applicable to, for example, a CD (optical controller)
The present invention relates to a DAD (digital audio disc) disc record player of the DAD (digital audio disc) system, and particularly relates to an improvement of the brushed motor device d.

[Technical background of the invention and its problems]

Recently, in the field of audio equipment, a digital recording and reproducing method using PCM (Russ Code Modulation) technology is being adopted in order to achieve high-fidelity reproduction as much as possible. In other words, this is what is called digital audio, and the audio characteristics do not depend on the characteristics of the recording medium and are much superior to those using conventional analog recording and playback methods. This is because it is established in principle.

In this case, a system that uses 99 pairs of disks as recording media is called a DAT system, and optical, electrostatic, and mechanical recording and reproducing methods have been proposed. Regardless of which method is adopted, the playback device that embodies it must be able to satisfy a variety of advanced control functions and performance that are not found in conventional devices. ing.

In other words, if we take the CD system as an example,
CLV is a disk made by coating a transparent resin disk with a diameter of 12 mm and a thickness of 1.2 Cru with a metal thin film that forms pits (irregularities with different reflectances) corresponding to digital (PCM) data. Approximately 500~ depending on the (constant linear velocity) method
It is driven to rotate at a variable rotational speed of 200ζICr,p,m), and is reproduced in a linear tracking manner from the inner circumference side to the outer circumference side using an optical pickup with a built-in semiconductor radar and photoelectric conversion element. The disc has a track pitch of approximately 1.6 [μm], and contains a huge amount of information that can provide approximately one hour of stereo playback even on one side.
), and their index data etc. are recorded in the lead-in area (radius 23 to 25 [ma, l
) It can be easily seen from the fact that the disc motor for rotating the above-mentioned disc has traditionally been a micromotor with a DC brush as shown in Figure 1. It is used. That is, in FIG. 1, 11 is a rotating shaft, and chassis 12
The chassis 1211 is inserted through the through hole 121 formed in the chassis 1211.
A pair of bearings 14 are loosely inserted into the through hole 131 of the holder 13 to which C is fixed, and are provided inside the through hole 13.
．． 15, which is rotatably supported at two different positions in the longitudinal direction. A disk table 16 is fitted to the end of the rotating shaft 1 that protrudes from one of the bearings 14, and the disk 17 is attached to a presser spring 2 having a disk retainer 18 and a spring seat 19.
Supported by 0.

Furthermore, a Komi data holder 22 that supports Komi data 21 is attached to the end of the rotating shaft 11 that protrudes from the other bearing 15 .

Furthermore, a stator magnet 23 is attached to the outer periphery of the holder 13.
A rotor coil 24 supported by the above-mentioned data holder 22 is provided so as to face the rotor coil 24 . Then, the outer peripheral member 25 covers the holder 1 so as to cover the rotor coil 24.
It is supported by 3. Further, the outer cylinder member 25 supports a pair of brushes 26 that come into contact with the comic data 21 and an electrode 27 for connecting the brushes 26 to an external circuit (not shown). The rear end portion of the outer peripheral member 25 is closed with a strawberry strain 28.

As shown in FIG. 2, the chassis 12 supports an optical pickup 29 so as to be movable in the radial direction of the disk 17 in the directions of arrows A and B in FIG. During playback, the light beam irradiated from the light beam irradiation section 291 of this pickup 29 is directed toward the disc 1.
The reproduction is performed by tracing the track T of No. 7.

By the way, as is clear from FIG. 2, the conventional brushed disc motor as described above has the following data:
A pair of brushes 26 sandwiching the pickup 29 are arranged at an angle of about 45° with respect to the moving direction of the pickup 29. On the other hand, the weight of the rotating shaft 11 is approximately 3 to 8' (,91) for a coreless type, and approximately 5 to 151 for a type with an iron core.
'). On the other hand, is the weight of disc 17 polycarbonate? In the case of Nate products, it is approximately 18 to 3611i'),
The weight of the disc table 16 is approximately 13~ for BsBM.
18(,F), and the weight of the disc presser 18 is approximately 20
~50 [I]. For this reason, the rotating shaft 11. f'
ISQ CHI-PLE 16. Disc 17. Disc presser foot 18
゜Comi data 21. The center of gravity of the entire rotating system consisting of the commutator holder 22, rotor coil 24, etc. is the disk 1.
7 will be located on the side where it is installed. Since there is a clearance between the rotating shaft 11 and the bearings 14 and 15, the rotating shaft 11 is normally rotated in an inclined state as shown in FIG.

When an external impact is applied to the disk motor in such a rotating state, a phenomenon occurs in which the rotating shaft 11 is rotated along the inner circumference of the bearing 14.15, but due to the action of the brush 26, the rotating shaft 11 is rotated. In fact, reciprocating vibrations occur along the direction of the brush 26, that is, in the directions of arrows (C) and (I) in FIG. By the way, the direction of vibration of the rotating shaft 11 is determined by a component in the moving direction of the pickup 29, that is, a tracking direction, and a component in the linear velocity direction of the truck T passing through the light beam irradiation part 29 of the pickup 29, that is, the direction indicated by the arrow in FIG. Therefore, when performing the tracking direction of the pickup 29 or the CLV servo of the disk 17 based on the digitized data read by the pickup 29, it may have an adverse effect on both servos. In particular, once the above reciprocating vibration occurs, the rotating shaft 11 and the bearings 14, 15 may be damaged at a location different from the location where the rotating shaft 11 and the bearings 14, 15 first came into contact and formed an oil film. 15, so it is difficult to stop it.

Here, the clearance between the rotating shaft 11 and the bearings 14 and 15 is approximately 4 to 15 [μ
The limit is to finish the signal at a track pitch of 1.6.
[μ hire], pit width 0.5 [μ milk], pit length 0.9
Considering that it is ~8.3 [μ steam], it is clear that this cannot be ignored. Also,
It is also necessary to improve the performance of both of the above-mentioned members so as to be able to follow the low frequency vibrations that accompany the impact when the rotating shaft 11 and the bearings 14, 15 collide.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and provides an extremely good brushed motor device for a disc record player that has a simple configuration and can suppress the vibration of the rotating shaft so as not to adversely affect the reading of digitized data. The purpose is to

-1 Overview of the Invention] That is, the present invention provides a disk on which digitized data obtained by converting an information signal into PCM is recorded, and the digitized data is read out through an optical pickup that is moved in the radial direction of the disk. In a brush motor device for a disc record player, which is provided in a record player to drive the rotation of the disc, and in which a rotating shaft is sandwiched between a pair of elastic brushes, the pair of brushes are moved in the direction of movement of the pickup. It is characterized by being arranged so as to be substantially perpendicular to the surface.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. That is, as shown in FIG. 3, this is achieved by arranging the pair of brushes 26 so as to be approximately perpendicular to the moving direction of the pickup 29, that is, the direction of arrows (A) and (B1) in FIG. This is a characteristic part of the invention.

According to such a configuration, first, the compliance of the rotating shaft 11 in the tracking direction, that is, the direction indicated by the arrow (B) is improved, so that vibrations of the rotating shaft 11 in the tracking direction are quickly suppressed. In addition, the rotation axis 1
Vibration in the far direction of line 10, that is, in the vertical direction in Fig. 3, occurs when the rotating shaft 11 and the bearing 14° 1 are generated as shown in Fig. 1 during normal rotation.
Since an oil film has already been formed at the contact point with 5, braking will be applied and it will be suppressed by Sumya Crab.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

〔Effect of the invention〕

Therefore, as detailed above, according to the present invention, there is provided a brushed motor device for a disc record player that is excellent in that it is possible to suppress the vibration of the rotating shaft so as not to adversely affect the reading of digitized data with a simple configuration. can be provided.

[Brief explanation of drawings]

1 and 2 are a side sectional view and a front view, respectively, showing a conventional brushed motor device for a disc record player, and FIG. 3 shows an embodiment of the brushed motor device for a disc record player according to the present invention. It is a front view. 1...Rotating shaft, 12...Chassis, 13...Holder, 14.15...Bearing, 16...Disc table, 17...Disc, 18...Disc holder, 19... ...Spring seat, 20...Press spring, 21...Komi data, 22...Komi data holder, 23...Stator magnet, 24...Rotor coil, 25-゛Outer cylinder member, 26...・・Brush, 27・
...electrode, 28...lid body, 29...pickup. Applicant's representative Patent attorney Takeshi Suzue Syllable 1 Figure 2

Claims (1)

[Claims] A disc record player reads out digitized data obtained by converting an information '6W signal into PCM through an optical pickup that is moved in the radial direction of the disc on which the digitized data is recorded. In a brushed motor device for a disk recorder, which is provided for the rotation of the disk +17K 1.111 and in which the rotating shaft is sandwiched between a pair of elastic brushes, A brushed motor device for a disc record player, characterized in that the brushed motor device is arranged so as to be substantially perpendicular to the pick-up movement direction.