JPS58200468A - disc playback device - Google Patents

Abstract

PURPOSE:To improve greatly the transient characteristics of disk revolution, by utilizing a disk as the rotor of a main motor at the time of transient, and by exerting magnetic flux generated by a magnetic circuit on said rotor to give correction torque. CONSTITUTION:A magnetic circuit 13 generates magnetic flux crossing a disk, and the one of magnetic poles is fixed to a lid member 14 which covers the top of a disk 1. The lid member 14 is fitted to a frame 16 of a reproduction device via a hinge 15 acting as a supporting device. The circuit 13, which generates rotating magnetic field or direct current magnetic field passing the surface of the disk 1 which contains conductive materials, is arranged to a location where it is not structurally limited. When the revolution speed of the disk 1 is out of the specified range, the circuit 13 is driven to generate magnetic flux in the direction to correct transient characteristics, and gives torque to the disk 1. As the result, the transient characteristics of disk revolution is greatly improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an fIk for reproducing a disc-shaped recording medium (hereinafter referred to as a disc) in which t* information is recorded at A11 degrees, such as a video disc or a PCM audio disc.
Ill is proud of it, and its purpose is to encourage people to change their skills.

In particular, the purpose is to modify the transient characteristics of rotational IILI, such as starting and stopping.

J%'J:gkIllM of the 8th century disk is a 900t-
P-I! 1. Rotate at high speed of 180 Or, p, -, etc. 5nh
b. The wrinkles that read the information in the autumn.

Eleven proposals have already been proposed. However, since the number of revolutions is relatively low, the time from when the disc is installed until it reaches the normal number of revolutions, or from when the operation ends (b) until it stops, is when the disc must be rotated once. There is an il+ limit due to the torque generated by the motor, and unless the performance of the motor is dramatically improved, a waiting time of 1G-20 seconds will occur.

Also, a constant relative speed disk (hereinafter referred to as "'F, CLV disk") which is recorded at a constant relative speed at a constant speed.
In this case, each time you change the gourd to be regenerated, you have to wait a considerable amount of time until you reach the point where you can achieve the relative velocity in that radius. During this waiting time, the main motor that rotates the disk and the inertia of the disk cause "
A considerable proportion of the time is spent due to occurrence of "slip".

The present invention provides a disk-shaped recording medium containing an electrically conductive material, rotatably supports this recording medium, and rotationally drives it by a main motor, and generates magnetic flux passing through both surfaces of the Itl recording medium. A magnetic circuit is provided, and the magnetic circuit is configured to apply a multiphase alternating magnetic field or a blood flow magnetic field to cause one rotation of the recording medium.

This has the effect of greatly improving the rotational transient characteristics of the main motor with simple means.

An embodiment of the present invention will be described below based on the drawings.

(υ is a disk, and the main motor (1) drives the rotating shaft 1
be done. (3) is a pickup device, which picks up the disk (1)
A pickup element that reads the information recorded on the top, and a tracking system that allows this pickup element to follow the signal train.

The TimePace includes elements and detection elements, and is fixed on the pickup device stand (4).

(The phrase is the pick-up device stand (with the feed screw that fits in April ζ).

The feeder (6) drives the pickup fjk t (8J in the radial direction of the disk (1). (7) is the IIM-, and the information that the pickup main body of II records is sent to Wk#. (The button is for synchronization, and 1 m m for 1 signal. Separate the synchronization signal from the output of 77 and input it to one terminal of the phase comparator. The output of the reference oscillator QIJ is input to the other terminal of the 1 phase comparator (9F), and when these two are compared, the power output connects the drive circuit (B) to the main motor (! ) is changed once so that the wave number of the synchronization signal II becomes constant.

Also, (L!+ is a one-turn detector, and the (L!+) of Uisuku (1) is
9) Generates an electric ratio or frequency proportional to the rotation. (2
) is a magnetic circuit that generates a flux across the disk (υ).

-The a pole of the force is the 1u disk (the lid member that connects the upper part of υ).
This lid member is fixed to the sink (as a support device).
2) It is attached to the playback device frame (l) through the playback device frame (l).In this way, the reason why only the 10000000 am is attached to the mass part is to prevent the 1ti&l! magnetic circuit (to) from becoming an obstacle when the disc is installed. This is to make it happen.

Reference numeral 071 is a voltage or frequency comparator which receives the output signal of the Iu rotation detector as input and outputs a rotation direction signal and an acceleration signal. (to) is a phase shift circuit that switches the direction of the single-turn magnetic field passing through the surface of the disk (1) in accordance with the first-turn direction signal of the comparison drive. Reference character a is a relay which performs 0N10FF electrophoresis of alternating current voltage #I in response to an acceleration signal from a comparative drive.

According to this configuration, a magnetic path (2) that generates a one-turn magnetic field or a -mm field that passes through a disk (the table of υ) containing a conductive material is distributed to a location that is not subject to any restrictions.
When the rotational speed of the disk (υ) is outside the predetermined range, the magnetic flux is generated in the direction to drive the magnetic road wheels and correct the transient characteristics. !] Compared to braking only by this, the 1-turn @ gentle characteristic is the same as above.

In addition, in the case of a disk with 11 metal islands,
Since the m contact surface is very thin at 600~IGOOA, if the eddy current value to generate torque is increased, m
Magnetic
It is desirable to limit the road wheels and use them in safe areas.

As explained above, according to the present invention, the disk itself
The main rotor in +c is used as the main rotor, and the aim generated from the -thermal circuit is applied to it to provide a correction torque, so a first-order effect can be used.

■ The transient characteristics of the key disk rotation are improved.

■ It can reduce the burden during the transition period of the main Tanabata festival.

■ DC power consumption of the disc playback device can be reduced.

(2) It is possible to expand the frequency range of rotation l1l-characteristics.

[Brief explanation of the drawing]

The drawing shows a recycle shaft of an embodiment of the disk reloading turtle of the present invention.
It is a block diagram of a system. (1)...Disk, (2j...Main motor, (
8)..."Synchronization separation circuit, (9)...Phase comparison -, O
(1...Basic PIP oscillation, (2)...Rotating pole mounting iris, oa...Magnetic 1GL path, First...Comparison number, -...
Relay, aU...AC power supply agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. A disc-shaped recording medium containing an electrically conductive material is provided. This recording medium is rotatably supported, and is driven synchronously by a main motor, and a magnetic circuit is provided that generates m fluxes that pass through both surfaces of the recording medium. A disc 6-producing device configured to control the rotation of the recording medium by applying a magnetic field or a DC magnetic field. 2. The disk reproducing apparatus according to claim 1, wherein the magnetic circuit is configured to perform one turn of the recording medium in cooperation with the main receiver. 8. The disc according to claim 1 of the patent, characterized in that the magnetic N path is driven so as to stop generating magnetic flux when the circumferential rotational speed of the recording medium is within a predetermined range. .