JPH01258277A - Moving device for converting element - Google Patents

Abstract

PURPOSE:To cause the moving speed of a converting element to be arbitrarily variable in a wide range by respectively controlling the revolving speeds of two motors independently and moving the converting element through a rotating body which is provided in the supporting body of the converting element. CONSTITUTION:A supporting body 2 of a converting element 1 independently rotates warm gears 32a and 32b respectively by motors M1 and M2 and the converting element moves in an X/Y direction through a rotating body 30 at a prescribed speed. This moving speed is set to be high when an error up to a target position is large and to be low when the error is closed by a program. Then, the regular and reverse rotation of the motors M1 and M2 and the number of rotation are independently controlled. Thus, the moving speed can be made variable from the high speed to low speed. Then, a moving device, which is stable to shock and oscillation and has a small access time, can be obtained.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is a method for recording and/or reproducing information signals such as audio and video onto a recording medium by moving a conversion element relative to the recording medium. The present invention relates to a conversion element moving device applied to a reproduction device.

[°Conventional technology]

Conventionally, this type of conversion element moving device moves a conversion element, which is an optical pickup, in the radial direction of the disk, for example, with respect to a disk-shaped optical recording medium, and collects information signals such as audio and video from the recording medium. There is a so-called compact disc device that re-traces the data.

As such a conventional conversion element moving device, the 12th
There are various types as shown in the figure. The device shown in FIG. 12(A) is composed of a rack and pinion, in which a support 2 on which a conversion element 1 is placed is moved against a disk (not shown) by a feeding mechanism consisting of a rack 3 and a pinion 4. ,
The conversion element 1 is moved in the disk radial direction.

Specifically, the pinion 4 is configured to transmit the rotational force from the feed motor 5 while being reduced in speed via the belt 6, pulley 7, and gear 8, and causes the rack 3 to move linearly. This rack 3
The support body 2 reciprocates in the direction shown by the arrow A with respect to the disk rotation axis 9 by the linear movement of the disk. Further, the support body 2 is guided by the groove 10. In the device shown in FIG. 12(B), the support 2 makes a swinging motion as shown by the arrow B, and substantially converts the conversion element l with respect to the disk 12 which is rotated in the direction of the arrow C by the disk motor 11. It moves the disk in the radial direction.

Specifically, the support body 2 is attached to the end of an arm 14 that is pivotally supported by an arm rotation shaft 13, and is made swingable.

The arm 14 is driven to swing by an actuator 17 made up of a magnet 15 and an excitation winding 16. What is shown in FIG. 12(C) is the support 2
is reciprocated in the direction of arrow A by a voice coil motor 18 to move the conversion element 1 in the disk radial direction. What is shown in FIGS. 12(D) and (E) is the support 2.
is moved back and forth in the direction of arrow A using a feed mechanism. Specifically, the support body 2 is capable of linear movement in the disk radial direction by a guide shaft 19b inserted through a pair of through holes 19a. A feed screw 21 is provided to be screwed into a female thread 20 formed on the support body 2 .

The feed screw 21 is rotatably driven by a motor 23 via a speed reducer 22, as shown in FIG. 12(E). The information signal on the disk read by the conversion element 1 is obtained via the data read circuit i24. This data readout circuit 24 includes the determination circuit 2
It is controlled by an output signal based on the determination result of step 5. In the determination circuit 25, the position of the conversion element 1 relative to the disk is detected by the position reading circuit 26. While the determination circuit 25 determines that the conversion element l has not yet reached the set position, the control circuit 27 controls the motor drive circuit 28 to operate the motor 23 based on the output signal of the determination result. It has become. When the conversion element 1 reaches the set position, the determination circuit 25 determines this, stops the operation of the motor 23, and controls the data readout circuit 24 to send out the read information signal.

In this way, in various conventional devices, the conversion element 1 accesses the set position on the disk, making it possible to reproduce a desired track.

[Problems to be Solved by the Invention] However, conventionally, the actuator 17. shown in FIGS. 12(B) and 12(C). The one using the voice coil motor 18 has the advantage of short access time, but has the disadvantage of malfunctioning due to shocks and vibrations.

On the other hand, the rack 3 shown in FIG. 12(A). The pinion 4 and the feed screw 21 shown in FIGS. 12(D) and 12(E) have the advantage of not causing malfunctions due to shocks and vibrations, but the access time is It had the drawback of being a large value of 100 milliseconds. In order to perform highly accurate access, the pitch must be made denser, which further increases the access time. Furthermore, in order to perform high-precision access, a reduction gear W22 and a high-precision motor are required as shown in FIG. 12(E), resulting in a complicated configuration.

Therefore, conventionally, there has been a problem that it has not been possible to obtain a conversion element moving device with short access time without sacrificing stability against shocks and vibrations.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a conversion element moving device with a short access time by utilizing a configuration with good shock resistance and vibration resistance.

[Means to solve the problem]

Means for achieving the above object in the present invention is a conversion element moving device for converting an information signal by moving the conversion element with respect to a recording medium, which includes a support supporting the conversion element, and a support body supporting the conversion element and the conversion element. a guide means for movably guiding the element in a predetermined direction together with the support; a rotating body rotatably attached to the support; and a first guide means for independently transmitting rotational force to the rotating body. ．． a second rotational force transmitting means; and the first. The first rotational force transmission means are each independently connected to the second rotational force transmission means. a second motor, current position address detection means for detecting a value corresponding to the current position of the support, and target position address setting means for setting the conversion element at a target position of the recording medium; Comparing means for comparing and obtaining the current position address obtained from the current position address detecting means and the target position address obtained from the target position address setting means, and corresponding to the comparison result obtained by the comparing means. The output signal of the frequency dividing circuit set at the frequency division ratio set by the first frequency division ratio is used as the sample signal. A signal obtained from the rotational speed of the second motor is used as a reference signal to perform phase comparison using a phase comparator circuit, and based on the comparison result obtained, the first motor. The present invention relates to a conversion element moving device characterized by comprising a control means for controlling the movement of the support body by controlling the rotational direction and rotational speed of a second motor.

[Effect]

In the above configuration, first. When the second motors independently rotate in a predetermined direction at a predetermined speed, the support body moves in a predetermined direction at a predetermined speed via the first and second rotational force transmitting means and the rotating body. Since the rotation speed and rotation direction of the first and second motors are set by comparing the current position address and the target position address of the support body, the support body moves to the target position at a predetermined speed.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 8, and the same parts as those of the conventional device will be given the same reference numerals and the explanation thereof will be omitted.

First, I will explain the configuration, but mainly the mechanical parts are shown in Figure 1~
This is shown in detail in FIG. 30 is a rotating body rotatably attached to the lower side of the support body 2, and 31 is its support shaft. The rotating body 30 has teeth 30a formed on its outer periphery. 32a and 32b are arranged with the rotating body 30 in between, and the teeth 3
0a meshing 1st. This is a worm gear that constitutes a second rotational force transmission means. As is clear from FIG. 4, the worm gears 32a and 32b are each independently connected to
, 33b to the first and second motors M, , M,.

The motors M+ and M2 are the first and second motors, respectively. Second drive circuit 35a
, 35b.

The drive circuits 35a and 35b are controlled by a control circuit 36. The current position of the support body 2 is detected by a current position address detection circuit 37 that detects the current position. The output of the current position address detection circuit 37 is supplied to a comparison circuit 38 and is compared with the target position set by the target position address setting means. The output of the comparison circuit 38 is supplied to the control circuit 36 to control the support 2 to move to the target position. On the other hand, the information signal read by the conversion element 1 is transferred to the comparator circuit 38 from the moving body 2, i.e.
The data is sent to the output side by a data read circuit 24 which controls data read when it is determined that the conversion element 1 is located at a target track on the disk.

FIG. 5 shows a circuit configuration in which the support 2 is moved in the radial direction with respect to the disk 12 by motors M+ and Mt. The position of the support 2 is detected by a current position address detection circuit 37 which has a resolution corresponding to the track position over the entire area of the disk 12, and this is detected by a resistor R connected to a DC power supply. It consists of a linear encoder constituted by a black 39 attached to the supporting body 2 in contact with it, and an A-D conversion circuit 40 that converts the output value of the linear encoder into a digital signal. The motors M+ and M2 are typically rotated at a rotational speed of 100 to 20 Or, p, m by the drive circuits 35a, 35b. These drive circuits 35a and 35b include a pair of transistors T connected between DC power terminals +V and -V.
It consists of a power amplification circuit configured by r and Trz.

Then, the input signals supplied to the bases of the transistors Tr, Trz are amplified in power and a desired DC voltage is applied to the motors M1 and M2. Encoders 41a and 41b are connected to motors M+ and Mz, respectively, for obtaining frequency signals that are integral multiples of the number of rotations. Reference numeral 42 denotes a target position address setting key constituting target position address means for setting the support 2, that is, the conversion element 1, at a target position on the disk 12. The target position address data set using the setting key 42 is input to the microcomputer 43 and stored in a register. At the same time, target position address data set by a target position address display 44 connected to the microcomputer 43 is displayed.

The A/D conversion circuit 40 is configured such that this current position address data is sequentially taken in by the microcomputer 43 under predetermined control. Microcomputer 43
On the output side of the first. Second programmable frequency divider circuit 4
5a and 45b are connected.

46 is a clock signal generation circuit, and the microcomputer 43. A-D conversion circuit 402 frequency division circuit 45a.

45b are operated in synchronization with a clock signal. The microcomputer 43 compares the target position address data set by the setting key 42 with the current position address data taken in from the A-D conversion circuit 40, and supplies the comparison result to the frequency dividing circuits 45a and 45b. It also forms a means of comparison.

50a and 50b are the first. The second switch circuit includes a pair of movable contacts p and p' and these movable contacts p.

Fixed contacts q, r, q/, for p′
It consists of r/. Fixed contacts q and r' of the switch circuit 50a
is connected to the output side of the first frequency divider circuit 45a, and the output side of the second frequency divider circuit 45b is connected to the fixed contacts q and rl of the switch circuit 50b. The output side of the first encoder 41a is connected to the fixed contacts r, q/ of the switch circuit 50a, and the output side of the second encoder 41b is connected to the fixed contacts r, q' of the switch circuit 50b. Movable contacts p, p of the switch circuit 50a
The input terminal of the first phase comparison circuit 51a is connected to the movable contact p of the switch circuit 50b.

The input terminal of the second phase comparison circuit 51b is connected to p'. A first error signal amplifier circuit 52a is connected to the output side of the phase comparison circuit 51a.
A second error signal amplification circuit 52b is connected to the output side of 1b. The output voltage of the error signal amplifier circuit 52a is supplied to the input side of the first drive circuit 35a via a resistor R. On the other hand, the output voltage of the error signal amplifier circuit is applied to the second drive circuit 35 via the resistor R2.
It is designed to be supplied to the input side of b. In this way, a control circuit is formed for controlling the motors M, , M, to a constant rotational speed by using the output signals of the frequency dividing circuits 45a and 45b as sample signals.

Next, the operation in the above configuration will be explained.

The support body 2 is equipped with motors M, as shown in FIGS. 1 to 4.
M is rotated in a predetermined direction at a predetermined rotation speed, and this driving force is transmitted to the rotating body 30 via worm gears 32a and 32b, respectively.
By rotating , it is moved in the X direction and the Y direction. This moving speed is controlled so that when the error to the target position is large, the speed is high, and when the error to the target position is close, the speed is low.

The setting of this target position and the movement control of the support body 2 with respect to the target position will be explained with reference to FIGS. 6 and 7. First, using the target position setting key 42, target position address data corresponding to the target track position is set. 6th
Step S1 in the figure is an initial setting state. At this time, the frequency dividing circuit 45a.

45b is set to "0" stop, and the switch circuit 50a
, 50b is set to "L". Here, when the enter (ENT) key of the target position setting key 42 is pressed, the microcomputer 4
3, target position address data and current position address detection circuit 37. The clock signal generation circuit 46 performs arithmetic processing with the current position address data obtained from the A-D conversion circuit 40.
start based on the clock signal of In step 32', target position address data is read, in step S2, current position address data is read, and in step S3, a difference (ACC) is taken for comparison of both address data.

In step S4, it is determined that ACC≧0.

When moving the support 2 from the inner circumferential side to the outer circumferential side of the desk 12 as shown in FIG. Set to negative, which is the polarity of reversal. Also, if the address error to the target position is 1oooo or more, the rotation speed of motors M, M2 is set to 100% of the maximum value, 10
00 or more and less than 1oooo is considered to be 50% of the rotation speed. Furthermore, when the value is from 100 or more to less than 1000, motor M2 is reversed, and when it is less than 100, both motors M1. M2
The robot is programmed to gradually decelerate and reach the target position. On the other hand, the microcomputer 43
When moving the support 2 from the outer circumferential side to the inner circumferential side of the disk 12 as shown in FIG. 7(B), unlike the case of FIG. 7(A), the rotation direction of the motors M, M2 is reversed. is programmed to take similar steps. The microcomputer 43 controls the rotational directions of the motors M+ and M2 by switching the movable contacts p and p' of the switch circuits 50a and 50b.

If the determination of ACC≧0 is YES in step S4, the polarity reversal flag becomes “0” in step S. If the determination in step S4 is No, step S? The polarity reversal flag becomes "1" and -ACC becomes AC in step S8.
It is converted to C. In step S9, the weight is set to VAL, =10
A determination is made that ACC≦V A L + when the value is 0. If the determination result is NO, the address error is 100 or more. In step 310, the weight is also set to vALz = 1
ACC≦VAL when ooo! A judgment will be made. If the determination result is No, the address error is 1000 or more.

Similarly, in step Sll, set the weight to VAL, =10000
A determination is made that ACC≦VAL3.

If the determination result is No, the address error is 10,000 or more. At this time, 5, in step Sl□, motor M1
.

Both M2 are processed to be rotated at 100% rotational speed, and in step 313 it is determined whether or not the polarity reversal plug=1 is present. If the determination result is YES, processing is performed in step 316 in which the rotational direction boats of the motors Mt and Mt are reversed. This processing result is set in the frequency dividing circuits 45a and 45b in step StS. If the determination result is No, the signal is directly set in the frequency dividing circuits 45a and 45b in step SIS.

If the determination result in step Sll is YES, in step 317 motor M1. Both Mz and Mz are processed to be rotated at a rotation speed of 50%. and step 5) 13r
At S16, the motors M, , M are reversed.

This processing result is transmitted to the frequency dividing circuit 45a in step 15.
45b.

If the determination result in step Sl+1 is YES, then in step 5Ill both motors M+ and M2 are rotated at 50% rotational speed, and in step S13' it is determined whether or not the polarity reversal plug 1 is present.

If the determination result in step S is YES, it is determined in step S6 whether the difference (ACC) is smaller than the minimum error value, and if NO, both motors M, , M are decremented in step SI9, and the rotational speed is Gradual deceleration processing is performed. Step S.

If the determination result is YES, the decrement at step S+9 is not performed. This processing result is the result of step 313'
The presence or absence of the polarity reversal plug=1 is determined.

If the determination result in step 311' is YES, step S1. At ', the rotation direction port reverses the motor M1. Also, step S1. If the result of the determination in ' is No, a process of reversing the motor M2 is performed in step 816'. This processing result is set in the frequency dividing circuits 45a and 45b in step 315.

In this way, the results of the arithmetic processing performed by the microcomputer 43 are set in the frequency dividing circuits 45a, 45b, and the switching states of the switch circuits 50a, 50b are set.

The output data of the frequency dividing circuits 45a and 45b is supplied as a sample signal S to one input terminal of the phase comparison circuit via switch circuits 50a and 50b. On the other hand, the encoder 4 is connected to the other input terminal of the phase comparator circuits 51a and 51b.
The output signals of 1a and 41b are sent to switch circuits 50a and 50b.
is supplied as a reference signal R via the reference signal R. Then, phase comparison is performed, and the errors are amplified by error signal amplification circuits 52a and 52b, respectively, and drive circuits 35a and 35, respectively.
b to move motors M1 and M2 100% in the specified direction.
Rotate at high speed.

The support body 2 approaches the target position at high speed by the operation of the motors M, , M2, but this approaching state is detected by the current position address data detection circuit 37, and the A-D conversion circuit 4
0 to the microcomputer 43 sequentially. The microcomputer 43 then compares the target position address data with preset target position data, and if the error address becomes less than 10,000, step S is performed. Judging this, the frequency dividing circuits 45a and 45b are set to 5 as described above.
Change to the set state corresponding to 0% speed. Therefore,
Motor M.

M2 is rotationally controlled at a predetermined speed using its set state as a sample signal S. The microcomputer 40 is
If a comparison result with an error address of less than 1000 is obtained, the seventh
When the motor Mt is moved from the inner circumferential side to the outer circumferential side as shown in FIG.
The switching is made. On the other hand, when moving from the outer circumferential side to the inner circumferential side as shown in FIG. 7(B), the motors M+, M
The switch circuits 50a and 50b are switched so that z is reversed.

When the microcomputer 43 obtains a comparison result in which the error address is less than 100, the microcomputer 43 decrements the motors M+ and M2 to move the support 2. That is, the conversion element 1 is moved in steps so as to be located on the target track, and finally stopped at the target track.

In this way, the current position address data of the support body 2 is detected by the current position address detection circuit 37, and a comparison with preset target position address data is made by the microcomputer 43, and the error address is determined based on the comparison result. When the error address is large, the converting element 1 is moved toward the target track at high speed by the high-speed rotation of the motors R/L and Mz, and when the error address becomes small, the conversion element 1 is decelerated and positioned on the target track.

Further, in order to speed up the processing, the step S2 of reading the current position address by the A/D conversion circuit 40 is performed by interrupt processing as shown in FIG.

That is, the microcomputer 43 reads the current position address data in step 20, stores this read data in the register of the microcomputer 43 in step 5ffil, and initializes an interrupt processing timer (not shown) with this data in step SZZ. It is processed by doing.

According to one embodiment of the invention described above, the conventional actuator 17. Compared to the one using voice coil motor 18,
Increased impact resistance and vibration resistance. Furthermore, since it is not affected by gravity, it is independent of the mounting position, and can be used in any position. Furthermore, since power supply is not used when the device is stopped, the device operates with less power consumption. Moreover, since it does not use a magnetic circuit, it is small, weighs,
Low price.

On the other hand, the conventional rack 3. Compared to a configuration using pinion 4 or a configuration using feed screw 21, motors M+ and M2 can be kept rotating at a constant rate even when the feed speed is extremely low, reducing static friction and viscous friction, resulting in stable It becomes a movement. Further, even if the reduction ratio is reduced, highly accurate access operation is possible, and access time can be reduced.

Furthermore, since coarse access and fine access can be performed using the same control system, there is no need to complicate the circuit configuration. Furthermore, by using the microcomputer 40, various controls can be easily performed.

Note that the switch circuits 50a, 5 in one embodiment of the present invention
0b may be constituted by a digital circuit 60 as shown in FIG. Here, 61 is a sample signal input terminal to which the output data of the frequency dividing circuit 45a (or 45b) is supplied, 62 is a reference signal input terminal to which the output signal of the encoder 41a (or 41b) is supplied, and 63 is a micro An input terminal 64a for a rotational direction control signal supplied from the computer 43 is a phase comparison circuit 51a (or 5
an output terminal connected to one input terminal of 1b), 64b
is also an output terminal connected to the other input terminal of the phase comparison circuit 51a (or 51b). Then, the AND gate circuits A, , A2 . A3. The gate operation of A4 is controlled to selectively send the signals supplied to the input terminals 61 and 62 to the output terminals 64a and 64b.

Furthermore, in one embodiment of the present invention, the phase comparator circuit 51a,
An example of 51b is one constructed from a digital circuit 70 as shown in FIG. Here, 71R is an input terminal for a reference signal, 71S is an input terminal for a sample signal, 72 is a phase difference detection output terminal for phase comparison, and 71S is an input terminal for a sample signal.
3 is a detection output terminal for phase delay and lead, and output signals from these output terminals 72 and 73 are used to control motors M and 1M.
2 is drive-controlled. FIG. 11 is a waveform diagram showing the operation of this circuit 70, and FIG.
shows the sample signal S, FIG. 11(B) shows the reference signal R, FIG. 11(C) shows the detection output of phase delay and lead obtained at the output terminal 73, and FIG.
) indicates the detection output of the phase comparison result obtained at the output terminal 72.

Furthermore, in the present invention, it goes without saying that the conversion element 1 can be used not only for reproduction, but also for recording only, or for both recording and reproduction, and the conversion of information signals with the recording medium can be performed not only optically but also optically. Other means such as magnetism may also be used. Further, the information signal in the present invention may be various types of data other than audio and video.

[Effects of the Invention] As described above, according to the present invention, rotational force is independently transmitted from the motor to the rotating bodies provided on the support for supporting the conversion element, and the rotating bodies are rotated in desired directions in desired directions. Since the conversion element is rotated at a high speed, the moving speed of the conversion element can be easily varied arbitrarily from high speed to low speed.

Therefore, the access time is short and high-precision access is possible, and the support body and the motor can be connected via gears, reduction gears, etc., which improves shock resistance and vibration resistance. It is possible to provide a novel conversion element moving device that eliminates the problems of the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a mechanical part of a conversion element moving device according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, and FIG. 4 is a drive control circuit, etc. FIG. 5 is a block diagram showing the circuit configuration in an embodiment of the present invention; FIG. 6 is a flowchart showing the operation of the microcomputer in an embodiment of the present invention; FIG. Figures (A) and (B) are characteristic diagrams showing the rotation speed and rotation direction of the motor in an embodiment of the present invention, and Fig. 8 is a flowchart for explaining successive current position addresses in an embodiment of the present invention. FIG. 9 is a circuit diagram showing an example of a switch circuit in an embodiment of the present invention, FIG. 10 is a circuit diagram showing an example of a phase comparator circuit in an embodiment of the present invention,
FIGS. 11(A) to 11(D) are waveform diagrams showing the operation of the circuit, and FIGS. 12(A) to 12(E) are explanatory diagrams showing various conventional devices. 1...Conversion element, 2...Support, 12
...Disk, 19b...Guide shaft, 30...Rotating body, 32a, 32b...
...Worm gear, 35a...First drive circuit, 35b...Second drive circuit, 36...
... Control circuit, 37 ... Current position address detection circuit, 38 ... Comparison circuit, 42 ... Target position address setting key, 43 ... Micro Computer, 45a...First programmable frequency divider circuit, 45b...Second programmable frequency divider circuit, 50a...First switch circuit, 5
0b...second switch circuit, 51a...first phase comparison circuit, 51b...second phase comparison circuit, M,,M! ······motor. Patent applicant Kunio Kaki, representative of Victor Japan Co., Ltd. Figure 2 Figure 3 Figure 5 Figure 6 (B) Figure 12 (C)

Claims (1)

[Claims] A conversion element moving device for converting an information signal by moving the conversion element relative to a recording medium, comprising: a support supporting the conversion element; and a guide for movably the conversion element together with the support in a predetermined direction. a guide means for
A rotating body rotatably attached to the support body, first and second rotating force transmitting means for independently transmitting rotational force to the rotating body, and the first and second rotating force transmitting means. first and second motors independently connected to each other, current position address detection means for detecting a value corresponding to the current position of the support, and setting the conversion element at a target position of the recording medium. a target position address setting means for comparing the current position address obtained from the current position address detecting means and a target position address obtained from the target position address setting means; a phase comparison circuit that uses an output signal of a frequency dividing circuit set at a frequency division ratio corresponding to the comparison result obtained by the means as a sample signal, and uses a signal obtained from the rotational speed of the first and second motors as a reference signal; and control means for controlling the rotational direction and rotational speed of the first and second motors based on the comparison results obtained by comparing the phases with each other to control the movement of the support body. Transfer device for conversion elements.