JPS5977672A - Device for controlling revolution of disc in disc reproducing device - Google Patents

Abstract

PURPOSE:To reduce pulse components and to attain servo control free from delay in phase by superposing a signal obtained by smoothing a phase comparing signal to the original phase comparing signal to control a disc driving motor. CONSTITUTION:A phase comparator 19 compares the phase of a linear speed detecting signal of a disc with that of a reference signal and a time constant circuit 50 in a disc driving servo circuit 22 smoothes the phase difference signal. An adder 51 superposes the original phase difference signal to the smoothed output from the circuit 50, so that a servo controlling signal reducing the pulse components, preventing the generation of riging of the disc motor 3 and the delay in phase due to the superposition of the phase difference signal and securing a phase margine sufficiently to prevent oscillation or the like is obtained.

Description

[Detailed description of the invention]

This invention provides a disc 10 in a disc playback device fVc for video discs, digital audio discs, etc.
Concerning the transmission counterfeit device, 1. The disk rotation motor is controlled by a signal obtained by superimposing a phase comparison signal between the disk rotation output multiplier and the reference signal, and a signal obtained by smoothing this phase comparison signal with a time constant circuit. By doing so, the disk rotation motor can be driven smoothly while ensuring the phase margin of the disk rotation servo loop.The reproduction color # of the digital audio disk is 1fjl.
The entire 1 +'+11 system is shown in Figure 1 [7J<->. In FIG. 1, the disc 1 is in the turn direction - on the pull 2,
The disk ljJ rotation motor 3Vr- drives the disk. The pink amplifier head 4 houses a semicircular radar, an optical system, a light receiving element, a focus control coil 5, a tracking IIi control coil 6, etc., and directs the laser beam from the objective lens 7 to the gf 2 of the disk 1. Face shot 1-
At the same time, the reflected light is received through the objective lens 7. The optical pink amplifier head 4 is fed in the radial direction of the disk 1 by a feed motor 8. The signal exposed by the optical pickup head 7 is sent to the preamplifier 9, AGC (Auto Galn Contr.
ol) The signal is sent to the demodulation circuit 12 via the circuit IO and the waveform shape circuit. The focus servo I:U detects the shift in focus of the laser beam based on the light receiver No. 13, and drives the focus control coil 5 so as to focus on the recording layer of the disk 1. When this focus servo circuit 13 is created with a normal loop gain during a feed operation such as random access, it follows the optical pickup head 4 as it cuts toward the trunk, moves the focus actuator accordingly, and produces a deafening sound. 1.1 to occur. However, if the rudder and focus servo are not activated at all, the regenerated clock for constant velocity (cLV) control will not be generated. Therefore, here, the loop gain is muted by a command from the system control circuit 37 during the feed operation. Based on the light reception signal, the tracking servo circuit 14 causes a tracking error detection output path 15 to shift the laser beam to the focused line 5, and a tracking control coil 6 to correct the shift.
Drive #J. As the playback of the disc progresses, the tracking displacement increases and reaches 71 in the tracking control coil 6. From the control circuit 37 to the feed motor drive circuit 4
0 to drive the feed motor 8. The output No. 1g of the He-shaped steamed bun circuit 1 is sent to the self-adjustment circuit A 12 and is used to create detection signals in the disk rotation servo of the Ct and V systems as well as h6. In other words, the output signal of the waveform shaping circuit is sent to the clock regeneration circuit.

[Added to 6,
Here the clock signal is obsolete. Synchronous Hakugo search circuit 1
7 detects the synchronization signal included in the output signal of waveform shaping circuit 1 (step 1) and outputs this synchronization signal. The 1st signal is frequency-divided by the frequency divider l!2 circuit 18 and applied to the phase comparator circuit 19.The phase comparator circuit F@19 uses this signal and the master clock generator circuit M)n to generate the n mass ( The phase ratio of the signal obtained by dividing the Z clock by the frequency dividing circuit 2J is softened 5, and the disk rotation servo circuit 2 is set so that these phases match.
The disk rotation motor 3 is controlled by 1U through the 1U. In the demodulation circuit 12, E F M (Eight to F
teenagerModulation ) modulated d
Adjust the original 8-bit signal VC signal 2 from the self-recorded disc 1 signal, and remove unnecessary items such as the combination bit and synchronization 1g number rz. The j circuit on the data center 11 side deinterleaps the 1g signal (the 10th signal on the disk recorded in an interleaved manner) output from the demodulation circuit 12 through the error correction circuit 27 and the memory circuit, and returns it to the original image. g
No. K11l is checked to see if there is an error, and if there is an error, the error correction circuit 27 corrects the error.
Amendments will be made to items that cannot be corrected. ``Also, by temporarily storing the corrected and corrected signal in the memory circuit at the timing of the reproduced clock signal 1, and outputting it at the timing of the master clock, it is possible to absorb the data distortion and the turntable's 20-rotation unevenness. Signals read from the memory circuit side (Stone channel every number and 5th channel number are arranged alternately in a time-sharing manner, 100) & Yori/A converter 2'J, 30V/- The subcode detection circuit 36 demodulates the subcode detection circuit 36 by the praise circuit 12. The subcode (address, track number, time code, etc.) is detected from the signal σ) and sent to the system control circuit 37.The system control circuit 37 decoders the address, track number, etc. specified by the operation key 38. 39, input it 1, compare it with the detected subcode above, and set the feed motor drive (1 path llO) so that they match.
Via 1-. to drive the feed motor 8. 1, the system control circuit 37 sends the suspended subcode to the display unit 42 via the drive circuit 41. The entire digital audio disc playback system is constructed as described above. Here, the disk 1EIltx servo circuit 22 is as follows:
For example, in the case of 9F, as shown in FIG. 2, the error signal (phase advance,
Depending on the delay, +By, (-)ヮ LE stone [
) 1 '7 + 2 'y (+ 'y 'a' lA
Anti-R, R- (J: 2911 Kawashi 2 muni...F t) Te/
Jiasuya, loose filter, 13 and motor drive 1I
IIJL! -! Disconnect the circuit 44 and connect the disk rotating motor 3 to 1j11. -4'
-rlb et al! A.
and INγ phase ratio v, output ig of if9 (, y3 (e
)i〕-1 1 sweat from the student tarotsuku, and 1 production 1'
No. (condolence: Figure 3 (b)) From the IF phase or the master clock (also from the master clock)
+Bv, 1 yen 11 te 6 and OV tonari, 742 part (d) of figure ic fX
'ifi: 3 if (d) K 71 <combined signal or diagonal) JL station. However, in the middle (-N, in the 1f beak formation in Figure 2, the disk ll, JIIp motor 3 city II fI
ltl i divination code (4 shi 3 fig. (d) 2 examples ze rus 1 戎min. many i; - due to the so-called motor ll! disk rotation, 1 baseter 3 rotation is slow and C). There are mermaids. Ma1ko, Kenmei eA Φ disk 1 Dansen servo rotation 2z
There were other doctors involved in the 41st year. This is achieved by smoothing the error ÷1 output from the digital phase comparator 19 using a time constant circuit consisting of a resistor R and a co/den ±C. 1. Disk with the average error signal and the target output of 7! 111
The transfer number 3 is the city 1 (I control it, and the time is 0). This circuit can be expressed as a block diagram using a transfer function as shown in FIG. :ii Figure 5 IF
Then, Kp: 41, Lt Software Conversion W Teaching -------
-: Lu-zo filter, 1:3 Denyo 1 xi'r28
+1 A: Transfer function KT of the motor drive circuit 44: Torque torque T of the disc rotation motor 3, , : Disturbance torque ■ = Inertia t'4 of the turntable 2 - motor B
: Chapter 8 on turntable bearings : Prime number (jω) −T : Transfer function of Chigan Gorge The one-cycle transfer function of the servo loose in Figure 5 is, , when the phase margin is small and the angular frequency ω becomes large and the phase lag becomes 180 degrees or more, if it is a loop advantage or an IF, the output Safe? Occurrence 1 - There are many flaws. This invention has been made in consideration of the above points (17) and is a disk rotation control device in a disk playback device that can prevent motor noise and also prevent phase shifter digits from becoming low. It provides and enhances the Based on this investigation, the phase ratio soft No. 14 is smoothed by the time T number circuit and the original phase comparison signal of the VC is determined by this investigation. Then, the disk rotating motor is controlled by V. This (1) arrangement is similar to the one shown in Figure 2. motor + li
1. l What is the ratio of the pulse component included in No. 118 A? /TCΦ (By reducing the pulse width and U's, motor noise can be prevented. = 152, phase delay 1 T2d), which is in the middle of the bone, looks like 7J'kel-, and I'm sowing the phase on the 1-J road, and I L Therefore, with reference to Figure 1 of this investigation, Figure 6 is the same as Figure 1. Disk rotation servo times 1422 V
-Constitution L7 of this invention-*: Relaxation pit /de 1- thing. With the same 7 as in Figure 1] outside the hIS that flows [
-No.'a-N'l. It is. In Figure 6, digital type IS), phase ratio 11η
Route 19 was created based on the master clock, and the clock R (created based on the clock R) was created based on the master clock.
7.117. Distortate phase ratio soft No. 18 and add -bo circuit 7.2vc. Disk times m bus servo times 1t62 times 1 hour foot control circuit 5
() is 6γ phase ratio ψ father information number kehan♂i? I, vehicle circuit,
] 1, a bypass path b' is connected to this Hiraichi output! Even if it is included in the comparison, it will take 1g + evening, and it will cost less. skewer, h
゛、Satai No. 18 is loop filter 1.3 and 7-
YuutaneυIiD +! ! The disk rotating motor 3 is connected to the city 11 through the J road. In the circuit of FIG. 6, the waveforms of the valleys of ta+~(,) are K4) as shown in FIGS. 7(a)~(,), respectively. In other words, the phase comparison No. 1g is shown in Fig. 7(c).
,・The phase force of the direction Ig (Fig. 7(b)) is 10Bv when it is ahead of the 5-base information signal (Fig. 7(C)), and Ov when it is behind. As shown in FIG. 7(d), the output signal of the injection circuit is obtained by smoothing the phase comparison signal of FIG. 7(e) (+y: J direct current pressure VDC). Then, from the superimposition circuit 51, a signal obtained by superimposing the average DC' voltage VDCVc phase ratio multiplied signal as shown in FIG. 7(e) is obtained. Compared with the +2 Bv fixed bias shown in Fig. 2, No. , the point victory is shown in Figure 2. Since the signal level of the part where the pulse does not rise ('f, that is, the average DC' voltage 'DC') is close to the target 'voltage vcVC', the assignment of the nocellus component is small. (pulse width is small), it is possible to prevent the disk rotation motor 3 from squealing.In addition, in the case of the CLV method, since the rotation speed of the disk 10 is changed according to the writing position l'1fvC, the motor control 11K
Pressure V. changes 1-or motor tJIt + starting pressure V or 1+rie(,'f, Fig. 8(a) σ] VcfOJ
) to 4th Figure 8(b). When Vc' VC changes, the pulse width in Figure 2 changes greatly as shown in Figure 8(b). According to the position iiK, the drive condition of the disk rotating motor 3σ) is greatly different. In light of this, 1, the one in Figure 6 is Figure 8 (b)
As shown in K Iwao 1-, the average DC voltage VDo changes and 7
Since the pulse width does not vary, the disk rotation motor 3 can be driven at a constant speed regardless of the playback position. 1, the pulse component included in the superimposed signal has a phase delay of y,
(Because of this, the phase delay caused by the +[green signal as a whole] is removed, and the phase lag caused by the servo loop's phase delay circuit 50r is eliminated, and the servo loop's phase extra beat force S is ensured, and the oscillation μg+h'''4- Specific details of the part surrounded by 59 in Fig. 6: 1) In Fig. 9, the time saving circuit (3) is a resistor). and capacitor C8, and its time constant output (average (1
The current voltage vDc) is amplified by N times using the operational amplifier a3, and then multiplied by 1 using the resistors R3 and R4.
), and the phase comparison signal from the S path path 52 is placed at the superimposition point 51i/(:). Fig. 10 shows another embodiment of the present invention. , helmet 6
As shown in the figure, the phase comparison signal and the average DC voltage vDo are combined without providing the bypass path 52. That is, in FIG. 10, the output line D of the phase comparison circuit 19 is directly connected to the loop filter 43, and a four-wire resistor R6 and a capacitor C? are connected between the output line and ground. When connected in series, a redundant 1'' path 60 is connected. In such a configuration, the phase comparison signal is smoothed and the average surface current voltage VL shown in FIG. 7(d) is connected to both ends of the capacitor C6. . When the comparison output (+Bv-t or Ov) is output from the phase comparator circuit 19, the voltage on the output line ( ) 6 appears as 1/7 of that voltage. In addition, the father's output is 1 (
If it is neither +Bv nor OV, the output impedance of 9 is still small, so the capacitor C is
80) The tonic pressure, that is, the average DC voltage v1]c is bounded by the output line b6. Therefore, as in FIG. 7(e), the output line 156 has the average direct current voltage "DC" and a soft signal with a phase ratio in front of it, and the output power line 156 has the average DC voltage "DC" and the phase ratio soft signal. Regarding the case where the invention is derived from a constant conversion rate (CLV) type reproducing device with 'faO', it can also be applied to a constant conversion rate (CAV) type o>14 raw j (cold). In this case, the turntable rotation in CAV Manshiki is 1 g.
− (in terms of one rotation angle of the turntable) ξ rus fa
- generated signal) to the detection signal of the phase comparator circuit 19. As explained above, 1) Invention r (The deviation is smoothed by the time constant circuit of the phase comparison signal G, and the original phase comparison signal is placed directly on the other sleeve to control the disk rotation motor. Φ, the pulse component contained in the control signal is reduced compared to the one-track H-f case using only phase comparison No. 4g, and motor noise is prevented. Since there is no phase lag in the pulse component that is sensed, there is no phase lag in the overall signal due to the apparent time constant of 1.r!J, which ensures sufficient phase margin for the servo loop and prevents rooting. The monkey is the one who does it.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the entire open side system in a digital audio disc playback device, Fig. 2 is a plotter diagram showing a conventional configuration example of the disc rotation servo LcJJ in Fig. 1, and Fig. 3 (a). ~(d) is the second
Waveforms of each part of (a) to (d) in the figure 1 ¥ 1.44 Figure is a block diagram showing another example of the conventional configuration of the disk rotation servo circuit ρ, and Figure 5 is a transmission diagram similar to the circuit in Figure 4. Figure 6 is a block diagram created using four functions. A block diagram showing an example of the invention of FIG. 7(a) to (
e) is a waveform diagram of the troughs of (a) to (,) in Fig. 6, and Fig. 8 ta) shows the human input signal of the loop filter 4:3 as shown in Fig. 2.
1 (dotted line) and the circuit of Fig. 6 (solid line), the waveform diagram shown, 8th section 1 (b) is (-ta city 1: @ 1 tortoise pressure V. is V. Similar waveform diagram for the Muni case, No. 9
The figure shows a specific example of the circuit surrounded by the reference numeral 59 in Figure 6.
'Circuit diagram, Figure 10 is the disk U of Figure 1 - Bo I!
l! FIG. 2 is a block diagram illustrating another embodiment of the present invention, which is constructed in a timely manner. 1...disc, 2...turn chisol, 3...
Disc rotor, 5...Focus City 11, 1
Coil, 6... Tracking control cape coil, 7... Objective lens, Addition... Master clock generation circuit, Friend...
Disk rotation servo circuit, 42...display section, 42...
・Display section, function, 60... time constant 1q+ path, )l...
Leisure expenses I! 2 circuits, 52...Pino ξ path.

Claims (1)

[Claims] Disk's airframe level (Katsu or old Kamo speed) Reconnaissance Satoru Gogo and 4 Jun 1
Compare the phase with d+5 2, and output the phase difference vch, N, the different pulse signal - [gold phase comparison 1i Taji, MtT
nlL general purpose comparison circuit) The phase comparison 1 is applied to the output number d of the square number circuit when smoothing the month d number, and the output number d of the 11th eye review number circuit.
! -! It is equipped with a superimposition circuit that superimposes the output of the J circuit 100, and the output information of the L911 small circuit. In the installation, the disk is turned around and the 11th reconnaissance T1 device is directly installed.