JPS60102897A - Feed drive device - Google Patents

Abstract

PURPOSE:To reduce the vibration and drive sound of a stepping motor by comparing the voltages of two types of triangular wave signals of different frequencies to form a pulse train signal which sequentially varies in pulse width. CONSTITUTION:A logic circuit 17 converts an input pulse signal (a) to drive signals I , II, III of rectangular shape by broken lines of waveform diagrams (c)- (e). This signal is converted to triangular wave signals designated by soild lines in waveform diagrams (c)-(e) by triangular wave converters 18-20. The signals c-e are applied to noninverting input terminal (+) of the comparators 21-23, while triangular wave signal 9 of high frequency is applied as reference signal to the inverting input terminal (-) of comparators 21-23. The comparators 21- 23 obtain pulse train signals which gradually increase in the pulse width shown in waveform diagrams (c')-(e'). The pulse train signals c'-e' are as the drive signals of a stepping motor 12.

Description

[Detailed Description of the Invention] Industry 1-17) Field of the present invention LL I'J? ? Inside the feed drive device for the picks' horns that go into the TL-shaped information recording medium re-iL device>
It involves stepping and using kshino.

The opening angle width stepping with the conventional example of 41 points is compared with other steps. Since there are no contact parts, there is almost no change over time, and it can be used as a highly reliable digitally controlled actuator. It is agreed that this stepping motor is used in the feed drive 8 device of the Lines 5, 6, 7.8 are on the right. DC voltage V is applied from switch 2 from Tl current power source 4.
By switching BL) and 3, the magnetic current is sequentially supplied to the four-phase stator windings 5 to 8, and the electromagnetic force generated in the windings 5 to 8 is changed. It uses force to attract and generate rotational force. Usually, the switches 2 and 3 for switching the excitation current are transistors.
There is. As is well known, this excitation method is classified into 1 excitation, 2 excitation, and 1-2 excitation force methods depending on the number of excitation phases.

FIG. 2 shows changes in the excitation drive signal of the four-phase two-excitation method.

A self-current voltage signal (hereinafter referred to as a drive signal) that supplies excitation current to the stator windings of the b-C114 phases in response to the input pulse signal a is shown. It is clear from FIG. 2 that a logic circuit is required to generate the drive signal 8 from the input pulse signal 8.

No. 31 female mouth, 1. Stepping and one-tap drive fJ, + control p
1079 (1079) of the 11 equipment (・, the pulse signal is generated from the signal circuit 9, and the pulse signal is generated; based on the logic Jyu (circuit 10
A signal matching the desired excitation method is generated, and an excitation current is sequentially supplied to the next-stage amplifier circuit 11 and DC power supply 13. In this way, the logic circuit 10 and the amplifier circuit A driving circuit 14 including 11 drives 9 by stepping.
It is accompanied by step-like movements (! Scrubray-X
To use it as a 1111 equipment for the 7 pickup feed drive (
There is a distance between L, 15, IJJ and liM that reduces the sound.

Conventionally, the vibrations generated from Stetsvinckmoke and the WJ shock switching of the erosive current (C excitation) by connecting the vibrations generated from the STETSUBINK MONK and the WJ shock current (C excitation) and the charging of the condenser (t) 111 (methods to prevent There is a known method to prevent -C by adding a mechanical damper foil to the output shaft.In the previous case, there is a simple tliC, but the constant of charging and discharging the capacitor is 1. In addition, in the case of the late Jin Dynasty, the cost would be high and a cheap motor drive system would not be possible.
Using the 1/'J method to reduce vibrations and noise, one drive signal a is converted into a pulse train signal whose pulse width gradually increases as shown in Figure 4 (1) using the C1 microprocessor. A driving device has been proposed in which the pulse trains A, 2 and 2 are used as drive signals and are applied to the C slappin motor.In this way, the deviation considerably reduces the vibration and noise caused by R1. However, in order to drive the slubbing motor, it is necessary to drive the slubbing motor.In addition, the L1 set sequentially generates the drive signals of the t. Therefore, to avoid the generation of drive signals, a dedicated microphone [1] is installed at I pin 12, and ``Strike ^, cheap Tanabata drive) - I can't hope for a neck.

J of -1, go to the sea urchin feed drive device and D C'E-
Stepping the motor [-tat 1'L1 construction, conventionally, compound male 41^N C(j'-,)t feed drive fb
1911 can be performed with digital precision without feedback, and there is a great deal of effort to put this device into a cylinder, but the above problems need to be solved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a feed drive device N that can reduce the cost of photographing and noise of a stepping motor drive.

Structure of the Invention The feed drive device of the present invention is a J5 U1 drive device that drives a stepper 'C' to a pick J' which detects ti'i information recorded on a disk-shaped II'1 information recording medium. In addition, the stepping (yoke drive circuit) has two types of angular waves (i3 ``''i = 1-E) with different frequencies.
(The pulse train signal is configured so that the i-th pulse width is 1, and the pulse train 1r2fj is stepped as one driving signal and applied to -9, which is 14 signals.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 5 to 8.

FIG. 5 shows a configuration diagram of a feed drive device for moving the pickup in the bidet sub disc brake V. 5 and 4, the J program L1 button shown in FIG. 3 and 11-8 has the same function as that in FIG.

The difference from FIG. 3 is that the pulse train generation circuit 15 shown in FIG.
is added to the drive circuit 16 by (=j).

Figure 6 shows an example of waveform shaping of the drive #J Hakugetsu of the 3-phase 1 excitation system into a pulse train signal, and Figure 7 shows the waveform shaping of the drive e signal into a pulse train (
The configuration of the pulse train generation circuit 15 for waveform shaping is shown in No. 3 and shown in FIG. 7, a to e.

CI, dl, CI are ae, c' in Fig. 6
, <W′.

It corresponds to C'. The pulse train generating circuit 15 inputs the input pulse No. 16 a to the logic circuit 17 and generates a rectangular drive signal 1. as shown by broken lines in FIG. ■.

■Converted to. This drive signal 1. l and III are the 6th signals in the respective triangular wave conversion circuits 18, 19, and 20.
Figure C・-〇 is a solid line? It is converted into a triangular wave signal such as R-4. The triangular wave signals ce are applied to respective inverting inputs 7 of the comparators 21-23. On the other hand, the inverting input 9 of the comparators 21 to 23;
I; L, L No. 3 (Fig. 3b K Small J, Tsu% 1l
jl: iL + - A triangular wave (+5) with a higher frequency than the angular wave signals c to e is applied as a reference signal.
In the figure; j <'J. J, Uni-Kakuwa No. 411 bO') Full width 11rl V l+ 1. L, E angle wave 13 bow c
O) f IF M'l V Compared to C (equivalent,
< is a small step constant (torque (33), and when comparing this with the voltage at 1 inverter leak 21-:23, Figure 0 C'...
(J is small at 3', and the pulse width gradually widens < %).
・Second “C1 town 1re lJba J reply column (i1 shift (:
', (J', (: If you step I and use it for drive No. 13 of -912, it will be a conventional problem -)C
stomach! ,=shi=evening 1-(movement and noise 1゛1 is tested.

2nd+1<l IC, the period of the manual pulse pick-up 1 goes from 1 to 11 (X doesn't matter -) 1!1, η, and the 1st circuit 11 goes to Fig. 8 t1. : The rectangular wave drive signal is reduced by the dotted line [and the solid line L'jll< fa
If converted to No. 4, pulse 9 is 1;; shi; Similarly, in the case of ', c', (j is done.

In each of the above embodiments, the output type 1F of the triangular wave conversion circuit is a triangular waveform (A-)-(A-)-(The pulse train signal has been described as having a pulse width gradually widening, but this is due to the triangular wave conversion circuit. Triangular waveform binding in which the output type I becomes lower as the time passes (if pulse train transmission is used in which the pulse width gradually narrows), vibration and noise can be expected to be reduced.

The feed drive RF of the present invention as described in the detailed description of the invention? J, the pulse width gradually changes by comparing two types of triangular wave signals with different frequencies.
Once generated, stepped as one drive signal and applied all at once.
Light from the switching motor to get the light/l! The vibration and noise are reduced, and the motor is sent to the drive unit! When used for i, a smooth driving force forms the 11th ability. Moreover, the circuit for converting such a pulse train signal from 1" to 1" is a simple circuit consisting of 11 amparators, the same number as the number of phases of the stepping motor, and resistors and transistors to convert it into a triangular wave. Add the circuit, and the given = ] angle angle wave 15 months complete I, second low 1st (realization of monkey 0'C (t5ru, 1

[Brief explanation of the drawing]

Figure 1 t Masu 1 Zubing (-ta drive 19 theory diagram, Figure 2 No. 14 phase 2 excitation 1.) Flame fj type b Ha arsenal drive (+, j
j: 1 (S type 1, Fig. 3 is STOTSUBIN q' T-Ku drive circuit side/ink diagram, 4th μ mouth top, 3rd part, waveform 1, 51st SI 1. L book conversion formula 1.: Meno rI
II'i iFl+ let j; /, Pulse train signal 1) Bow (・2 waveform shaping l) Reduce 1911; l'i'
Li!; waveform diagram in figure, 7th re<mouth a g'i3
('+ l shi 14. 1 in 1 degrees of the I-completion that is realized, 7th 31*mouth input pulse 1.) (4 that the circumference of 1 υ
−, /, 1191; l pulse train 1, 1 No. σ) Explanation 1
It's huge. 10... Theory attack y1X, 11... Amplification circuit, 1?・
・Snow Nobi〕・'gu [-ta, 1! l...Pulse train generation circuit, 1G...driver 11i1+ circuit, 17...-
Hitting times) 11, I+;, l! ! ,70...triangular wave too:
K/4 1lil Road, 21. 22, 23... 1 Shibareta agent 7'+, Ho i'i Town Hiroshi Figure 1 U Figure 2 Figure 4 Figure 5 Figure 7

Claims (1)

[Claims] 1. A stepping motor drives a pickup that detects information recorded on a disc-shaped information recording medium. In addition, a stepping motor drive circuit is connected to two types of triangular waves with different frequencies. □": 4'?T! 1
-i- Create a pulse train signal whose pulse width gradually changes by comparison.
Stepping as h signal and applying to -9 1. : Sending! II device.