JPS6058542B2 - Arm drive control device for a player equipped with a linear tracking arm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arm drive control device for a player equipped with a linear tracking arm.

As is well known, in a player equipped with a linear tracking arm, the arm tracks in the tangential direction of the recording groove so that the stylus of the pickup cartridge attached to the tip of the arm directly traces the recording groove of the record. It is positioned so that it slides in a straight line.

However, the general configuration of the arm drive control device in this type of player is such that when the stylus tip of the pickup cartridge moves to follow the recording groove of the record, the deviation of the arm that occurs at this time is controlled by the deviation of the arm. The angle is detected by the angle detection mechanism, and the arm drive mechanism is operated based on this detection result, thereby moving the base end of the arm parallel to the moving direction of the needle tip so as to correct the deviation. As a result, the arm is positioned in the tangential direction of the recording groove and moved linearly. By the way, in such a player, when the arm is driven by a servo system including the deflection angle detection mechanism, the following problem occurs at the time of starting the drive.

That is, the servo system having the deflection angle detection mechanism is in an operating state in which it can detect the deflection of the arm immediately when the deflection angle detection mechanism attempts to drive the arm. Therefore,
If the arm has a large deviation when the arm starts to drive, this large deviation is detected by the deviation angle detection mechanism, and the arm is impulsively moved based on this detection result. There was an inconvenience that an overrun occurred when moving. In view of the above circumstances, the present invention provides an arm drive control device for a player equipped with a linear tracking arm that is capable of smoothly driving the arm without applying any impact to the arm when the arm starts to be driven. The arm deflection angle detection mechanism is constructed using a photoelectric method, and the light emitting element of this deflection angle detection mechanism is designed to gradually light up at the point when it starts to light up, for example, when the arm is lowered. This is what happens.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of an arm drive control device according to the present invention, and in this figure, reference numeral 30 indicates an arm deflection angle detection mechanism.

This arm deflection angle detection mechanism 30 detects the deflection angle when the arm 31 is deflected, and is constructed using a photoelectric system. That is, the arm deflection angle detection mechanism 30 includes a slit plate 32 (shielding means) that deflects as the arm 31 rotates, and light emitting diodes (hereinafter referred to as LEDs) that are disposed facing each other with the slit plate 32 in between. 33 (light emitting element) and CdS photoconductive cell (hereinafter referred to as Cd
) 34a, 34b (light receiving elements) and CdS34
It is composed of an output extraction circuit 36 that extracts changes in the resistance values of the elements a and 34b as changes in voltage, and when the arm 31 rotates and the slit plate 32 is deflected, the LED 33 is connected to the hole 32a of the slit plate 32. Through CdS34a,3
The amount of light irradiated to CdS 4b changes, and the change in the resistance value of CdS 34a, 34b due to the change in the amount of light changes the output extraction circuit 3.
6, it is taken out as a change in voltage.
The output of this arm deflection angle detection mechanism 30 is supplied to a motor control circuit 37. The motor control circuit 37 generates a motor control signal according to the output of the arm deflection angle detection mechanism 30, and sends this to the motor drive circuit 38.
It is intended to supply The motor drive circuit 38 drives the arm drive motor 39 based on the motor control signal. Based on this configuration, A. The arm 31 is driven such that its deviation is detected by the arm's deviation angle detection mechanism 30 when a record is reproduced, and the deviation is corrected based on the detection result. And detect the arm deflection angle in the above configuration! In the mechanism 30, the on/off of a servo operation for detecting the deflection angle of the arm 31 is controlled based on the operation of a light emitting diode lighting control circuit (hereinafter referred to as an LED lighting control circuit) 40.

That is, the LED lighting control circuit 40
The LED 33 is turned on or off by opening and closing the LED 33, and by controlling the turning on and off of the LED 33, the servo operation is turned on and off. In this case, the switch 41 is opened and closed by the raising and lowering operations of the arm 31.
When the arm 31 is in the raised position, the LED 33 is turned off, and when the arm 31 is in the lowered position, the LED 33 is turned on. Also, switches 42, 43
is switched when the arm 31 in the lowering state is moved by manual operation, and the LED 33 is turned off when the arm 31 is moved and reaches both end limit positions of the allowable movement range. Conversely, when the arm 31 is moved from the above-mentioned both end limit positions to within the above-mentioned allowable movement range, the LED 33 can be switched to light up. Therefore, the LED lighting control circuit 40 lights up the LED 33 by switching the switches 41 to 43.
It controls turning off the light, but at this time, the configuration is such that when turning on the LED 33 that is in the off state, the same LED 3
3 is configured to light up gradually. In other words, the LED lighting control circuit 40 lights the LED 33 so that the amount of light gradually increases when the LED 33 starts lighting, and gradually puts the arm deflection angle detection mechanism 30 into the operating state ( (the detection output of the deviation angle detection mechanism 30 is gradually increased). Note that FIG. 2 is a diagram showing the positional relationship of the arms 31,
In this figure, reference numeral 44 is a pickup cartridge attached to the tip of the arm 31, 45 is an arm base that supports the base end of the arm 31, and 46 is a record disc.

In this figure, A indicates the left limit position of the arm 31, and B indicates the right limit position (armrest position) of the arm 31. Further, the motor control circuit 37 can be supplied with a signal from an arm manual operation control circuit 47 when the arm 31 is in the raised position.

The arm manual operation control circuit 47 generates a manual operation signal for the arm 31 in the raised position, and includes a switch 48 that generates a signal for moving the arm 31 to the left.
The switch 49 generates a signal for moving the robot to the right. Next, the operation of the arm drive control device will be explained. First, in this device, the arm 31 is driven in the following manner during record disc playback.

If the arm 31 is now in the raised position, the LED lighting control circuit 40 turns off the LED 33 depending on the current position of the switch 41. From this state, when the arm 31 is lowered to play the record,
The switch 41 is switched, the LED lighting control circuit 40 lights up the LED 33, and the arm deflection angle detection mechanism 30 is put into operation. At this time, the LED lighting control circuit 40
The LED 33 is gradually turned on, and the arm deflection angle detection mechanism 30 is gradually brought into operation. Therefore, at this time, even if the arm 31 is largely deviated, the output of the deviation angle detection mechanism 30 gradually increases, so the arm 31 suddenly changes based on the output of the deviation angle detection mechanism 30. Never moved. When the record playback is started, the deviation angle detection mechanism 30 detects the deviation angle of the arm 31, and based on this detection result, the motor control circuit 37 and the motor drive circuit 38 detect the deviation. Motor 3 to correct
9, and thus the arm 31 is driven. Also,
When the arm 31 is raised based on an appropriate drive command from the above state, the switch 41 is switched to
The ED lighting control circuit 40 turns off the LED 33, and the servo operation of the arm deviation angle detection mechanism 30 is canceled. However, in such a state, the arm 31 can be moved based on other commands. For example, when manually operating the arm 31 in the raised position, the switches 48 and 4 of the arm manual operation control circuit 47
All you have to do is operate 9. That is, when the switches 48 and 49 are operated, the arm manual operation control circuit 4
A manual operation signal is generated at 7 and this signal is supplied to the motor control circuit 37. As a result, the motor control circuit 37 generates a motor control signal based on the manual operation signal, the motor drive circuit 38 drives the motor 39 based on the motor control signal, and the arm 3
1 is manually operated. In addition, in this arm drive control device, when the arm 31 in the lowering state is moved by manual operation, excessive movement of the arm 31 beyond the permissible movement range is prevented. i.e. arm 3
1 by manual operation, the arm 31
(However, the pickup cartridge 44
(the stylus tip is not in contact with the top surface of the record 46), the arm deflection angle detection mechanism 30 is turned on, and the arm 31 is deflected to operate the deflection angle detection mechanism 30. The motor 39 is rotated based on the output of the deflection angle detection mechanism 30, thereby moving the arm 31 in a predetermined direction. Therefore, as long as a deflection is applied to the arm 31, the arm 31 will move in the direction in which the deflection is applied, and there is a risk that the arm 31 will move beyond the allowable movement range. However, in this device, when the arm 31 reaches the left limit position A or the right limit position B shown in FIG. The control circuit 40 turns off the LED 33. As a result, the output of the arm deflection angle detection mechanism becomes negative, so that the rotation of the motor 39 is stopped and the movement of the arm 39 is stopped. Therefore, in this device, when the arm 31 is moved manually, it is possible to prevent the arm 31 from moving beyond its permissible movement range. Also the third
FIG. 1 is a circuit diagram showing a specific configuration of an arm drive control device according to the present invention.

The circuit shown in this figure is a specific configuration example of the apparatus shown in FIG. 1, and in this figure, the same parts as in FIG. 1 are given the same reference numerals. This FIG. 3 will be explained below. First, in the arm deflection angle detection mechanism 30, the LED 3
3, one end is connected to the output end 61 of the LED lighting control circuit 40 via a resistor 60, and the other end is grounded.

The CdS 34a, 34b also include resistors 64 to 66 connected in series between the positive power terminal 62 and the negative power terminal 63;
With respect to the variable resistor 67 and the resistor 68 (these elements constitute the output extraction circuit 36), the CdS 34a is connected in parallel to the resistor 65, and the CdS 34b is connected to the connecting point 69 of the resistors 65 and 66 and the sliding of the variable resistor 67. connected between the terminals. In addition, the motor control circuit 37 and the motor drive circuit 3
The configuration of No. 8 is as follows. That is, the connection point 69
is connected to the inverting input terminal 71 of the operational amplifier 71 via the resistor 70.
connected to a. A resistor 72, a variable resistor 73, and a resistor 7 are connected in order between the positive power terminal 62 and the negative power terminal 63.
4 is inserted, and the sliding terminal of the variable resistor 73 is connected to the non-inverting input terminal 71b of the operational amplifier 71 via the resistor 75. In this case, the resistors 64 to 65, 68, 72, 7
4. Values of variable resistors 67, 73 and variable resistors 67, 7
The positions of the sliding terminals 3 are the voltage 1 obtained at the normal connection point 69 (the voltage supplied to the inverting input terminal 11a) and the voltage V2 obtained at the sliding terminal of the variable resistor 73 (the voltage supplied to the non-inverting input terminal 11a). The voltage supplied to the end 71b) is set to be equal to the voltage supplied to the end 71b. Further, the non-inverting input terminal 71b is connected to the output terminal 77 of the arm manual operation control circuit 47 via a resistor 76.
It is connected to the. The output terminal 71c of the operational amplifier 71 is
It is connected to the base of transistor 79 via diode 78 and to transistor 8 via diode 80.
It is connected to the base of 1. The transistor 79 has its base connected to the positive power supply terminal 62 via the resistor 82, its collector connected to the positive power supply terminal 62, and its emitter connected to the terminal 84 via the resistor 83. The transistor 81 has its base connected to the negative power supply terminal 6 via the resistor 85.
3, the collector is connected to the negative power supply terminal 63,
The emitter is connected to terminal 84 via resistor 86 . The terminal 84 is connected to the inverting input terminal 71a via a resistor 87.
diodes 88, 8 connected in parallel with
9 to the motor 39. Diodes 90 and 91 are inserted between the terminal 84 and the positive power supply terminal 62 and between the terminal 84 and the negative power supply terminal 63, respectively. Further, the configuration of the LED lighting control circuit 40 is as follows.

That is, the switch 41 energized by the LED lighting control circuit 40 has its contact 41a. It is connected to a positive power supply terminal 96 via a resistor 95, and to the base of a transistor 99 via a diode 97 and a resistor 98, which are successively connected in series, and a contact 41b is grounded. Also, the contact 42a of the switch 42 is connected to the positive power supply terminal 96! The contact 42b is connected to the connection point 101 between the diode 97 and the resistor 98 via the diode 100. Further, the switch 43 has its contact 43a connected to the positive power supply terminal 96 via the resistor 102, and the diode 1
03 to the connection point 4101, and the contact 43
b is grounded. In this case, the switch 41 is switched in conjunction with the raising and lowering operations of the arm 31, and is opened when the arm 31 is in the raised position and closed when the arm 31 is in the lowered position. Also switch 42
, 43 are switched when the arm 31 in the lowering state reaches the left and right limit positions A and B, and the switch 42 is normally open and is closed when the arm 31 reaches the left limit position A. , the switch 43 is normally closed and opens when the arm 31 reaches the right limit position B. Transistor 99 has its base connected to resistor 1
The collector is connected to the positive power supply terminal 96 via a resistor 105, and to the base of a transistor 108 via resistors 106 and 107 connected in series. Further, at this time, the connection point between the resistors 106 and 107 is grounded via a capacitor 109. The transistor 108 has its collector connected to the positive power supply terminal 96 and its emitter connected to the output terminal 61. The configuration of the arm manual operation control circuit 47 is as follows. That is, the switch 48 attached to this arm manual operation control circuit 47 has its switching contact 4
8a is grounded, a contact 48b is connected to the positive power supply terminal 96 via a resistor 110 and to the base of a transistor 112 via a diode 111, and a contact 48c
is connected to the base of the transistor 112. At this time, the contact 48b is also connected to the input terminal 113a of the output level control circuit 113. Also switch 49
The switching contact 49a is grounded, the contact 49b is connected to the positive power supply terminal 96 via the resistor 114 and the base of the transistor 116 via the diode 115, and the contact 49c is connected to the base of the transistor 116. has been done. At this time, the contact 49b is also connected to the input terminal 113b of the output level control circuit 113. In this case, each of the above switches 48 and 49 has a switching contact 4
8a, 49a are switches that are in constant contact with contacts 48b, 49b, and by performing the switching operation, first, the switching contacts 48a, 49a are switched between the contacts 48b, 49b and the contacts 48c, 49c [contact 48b , 49b and contact 4
8c, 49c], and by further performing a switching operation, the switching contacts 48a, 49a come into contact with the contacts 48c, 49c. The transistor 112 has its collector connected to the output end 113c of the output level control circuit 113 via resistors 117 and 118 connected in series, and its emitter is grounded via a diode 119. The transistor 116 has its collector connected to the output end 113d of the output level control circuit 113 via resistors 120 and 121 connected in series, and its emitter is grounded via a diode 122. Further, a connection point 123 between the resistors 117 and 118 is connected to an inverting input terminal 125a of an operational amplifier 125 via a resistor 124,
A connection point 126 between the resistors 120 and 121 is connected to a non-inverting input terminal 125b of the operational amplifier 125 via a resistor 127. The operational amplifier 125 has a non-inverting input terminal 125b grounded via a resistor 128, and an output terminal 125b.
c is connected to the inverting input terminal 125a via the resistor 129, and is also connected to the output terminal 77. In this configuration, the output level control circuit 113 has input terminals 113a,
For the input voltage applied to the output terminal 113b, the output terminal 113c
, 113d output a predetermined voltage proportional to the input voltage. Next, the operation of the circuit having the above configuration will be explained.

First, the LED lighting control circuit 40 turns off the LED 33 when the arm 31 is in the raised position, and puts the arm deflection angle detection mechanism 30 in a non-operating state. That is, arm 31
When the switch 41 is in the raised position, the switch 41 is open, and at this time, the positive power supply terminal 96 is connected to the resistor 95 and the diode 9.
7. A base current is supplied to the transistor 99 through the resistor 98, and the transistor 99 is in the 1-on state. Therefore, at this time, the base potential of the transistor 108 is set to a low level, the transistor 108 is in a 1 off state, and the LED 33 is turned off. As a result, various Rx and Ry of CdS34a and 34b are as follows.
Both values are high without being irradiated with light from the LED 33. Therefore, the voltage (2) obtained at the connection point 69 at this time is a constant value determined by the respective values Ra, Rb of the resistors 65, 66, and is equal to the voltage (2). Now, when the arm 31 is lowered from this state to play a record, for example, the arm deflection angle detection mechanism 40 becomes operational as follows.
That is, when the arm 31 is lowered, the switch 41 is closed and the supply of base current to the transistor 99 is stopped, and the transistor 99 is in the 1-off state and the transistor 108 is in the 1-on state. The LED 33 is turned on by the collector current of 108. As a result, CdS34a and 34b are LED3
By being irradiated with light from 3, its resistance value is decreased. Therefore, the voltage V1 obtained at the connection point 69 at this time
depends largely on the resistance values Rx and Ry of the CdS 34a and 34b, and the slit plate 32 is displaced and the CdS
When the amount of light received by 34a and 34b changes, it changes in accordance with the change in resistance values Rx and Ry. In this way, the arm deflection angle detection mechanism 30 is in a state where it can detect the deflection angle of the arm 31 when the LED 33 lights up. When record performance is started in this state, the arm deflection angle detection mechanism 30, motor control circuit 37, and motor drive circuit 38 operate as follows.

That is, when the arm 31 deflects, the voltage V1 at the connection point 69 changes in accordance with this deflection, and this change ΔV1 is supplied to the inverting input terminal 71a of the operational amplifier 71. The operational amplifier 71 compares the variation ΔV1 with the reference voltage applied to the non-inverting input terminal 71b, and outputs a voltage corresponding to the variation ΔV1 at the output terminal 71c (a voltage whose phase is inverted).
is output as a motor control signal. For example, if the voltage obtained at the output terminal 71c is negative, the base voltage of the transistor 81 decreases in accordance with this voltage, and the transistor 81 enters the 1-on state. As a result, the output current is supplied from the terminal 84 to the motor 39 through the diode 89, and the arm 31 is thus driven so that its deviation is corrected.Meanwhile, in the above operation, the LED lighting control circuit 40 , when operating the arm deflection angle detection mechanism 30, it is gradually brought into operation.

That is, the transistor 108 of the LED lighting control circuit 40
When the values of the resistors 105 and 106 are respectively RC and RC, and the value of the capacitor 109 is Ca, the base potential rises with a time constant (Sec) determined by Rc and Ca, and the collector The current increases gradually with a simultaneous constant. Therefore, at this time, the light amount of the LED 33 gradually increases in accordance with the time constant, and the output voltage of the arm deflection angle detection mechanism 30 gradually increases. That is, considering the voltage obtained at the connection point 69 of the arm deflection angle detection mechanism 30, the circuit consisting of the CdS 34a, 34bl resistors 65, 66, and the variable resistor 67 in the arm deflection angle detection mechanism 30 has a variable resistance. When the resistance value of the circuit 67 is ignored, it can be expressed as shown in FIG. In FIG. 4, when the voltage at the connection point 69 with respect to the connection point P1 is V''1, and the voltage at the connection point P2 is V.

And here, if we set Ra=Rb, CdS34
The relationship between the amount of light received by a and 34b and α is shown in FIG. As is clear from FIG. 5, the voltage V″
1 changes within the range between the upper and lower limits of α depending on the amount of light received by the CdSs 34a and 34b. Therefore, this voltage ``1'' will gradually increase by gradually increasing the amount of light from the LED 33. As a result, the voltage
Even if the MU 31 is largely deviated at the start of its drive, the output of the arm deflection angle detection mechanism 30 gradually rises, so that it is smoothly driven without any sudden correction. In addition, based on instructions from the above situation, A. When the arm 31 is raised, the switch 41 of the LED lighting control circuit 40 is opened, and the servo operation of the arm deflection angle detection mechanism 30 is canceled as described above.

Further, the operation of the arm manual operation control mechanism 47 is as follows.
In the state where the arm 31 is raised as described above, the following steps are performed.

That is, the switch 48 attached to this control mechanism 47
, 49 have their switching contacts 48a, 4 under normal conditions.
9a is connected to contacts 48b and 49b. In this state, the base potentials of the transistors 112 and 116 are at low level, so both of them are 1 off.The output level control circuit 113 has the potentials of its input terminals 113a and 113b both at low level, so the output voltage from output terminals 113c and 113d is are both low level, and the operational amplifier 125 is at connection point 1.
Since the input voltages supplied from 23 and 126 to the inverting input terminal 125a1 and the non-inverting input terminal 125b are both low level, the output voltage of the output terminal 125c is at ambient level. Therefore, at this time, the potentials of the inverting input terminal 71a and the non-inverting input terminal 71b of the operational amplifier 71 are equal, and the output voltage of the output terminal 71c is at ambient temperature, so that the motor 39 is not driven. Now, if the arm 31 is to be manually moved, for example, to the left in FIG. 2, the switch 48 is operated.

In this case, the switch 48 positions the switching contact 48a between the contacts 48b and 48c when performing slow movement of the arm 31, and brings the switching contact 48a into contact with the contact 48c when performing the same rapid movement. That is, when the switching contact 48a of the switch 48 is located between the contacts 48b and 48c, the transistor 1
A base current is supplied to the transistor 112 so that the transistor 112
is 1 on (the transistor 116 is 1 off), the input terminal 113a of the output level control circuit 113 becomes high level, and the output terminal 113c becomes high level (the output terminal 113d
is low level). As a result, a voltage obtained by dividing the voltage obtained at the output terminal 113c by the resistors 117 and 118 is applied to the inverting input terminal 125a of the operational amplifier 125.
Inverting input terminal 125a is high level, non-inverting input terminal 125
b becomes low level. Therefore, in this case, the operational amplifier 1
25 is the voltage of the inverting input terminal 125a and the non-inverting input terminal 12
5b is output (in this case, the output voltage is a negative voltage), and this is supplied as a manual operation signal to the non-inverting input terminal 71b of the operational amplifier 71 through the output terminal 77 and the resistor 76. do. As a result, the operational amplifier 71 outputs a negative motor control signal corresponding to the manual operation signal to its output terminal 71c. As a result, the transistor 81 is turned on in the same way as in the case described above, the motor 39 is driven, and the arm 31 is moved to the left. In this case, the feed speed of the arm 31 is
By appropriately setting the value of 8, a delay is achieved. Further, when the switching contact 48a of the switch 48 is brought into contact with the contact 48c, the transistor 112 is turned off. ! (The transistor 116 is also 1 OFF J), the output terminal 113c of the output level control circuit 113 becomes a high level (the output terminal 113d is a low level), and the voltage of the output terminal 113c is supplied to the inverting input terminal 125a of the operational amplifier 125, and the inverting input The terminal 125a is at a high level, and the non-inverting input terminal 125b is at a low level. Therefore, in this case as well, the output terminal 12 of the operational amplifier 125
A negative manual operation signal is output to 5c, and the arm 31 is subsequently moved to the left in the same manner as in the above case. In this case, the feeding speed of the arm 31 is faster than that in the above case because the voltage output to the output terminal 113c is directly applied to the inverting input terminal 125a. Further, when manually feeding the arm 31 to the right in FIG. 2, the switch 49 is operated.

In this case, the method of operating the switch 49 is as follows.
The switching contact 49a is positioned between the contacts 49b and 49c when the arm 31 is moved slowly, and the switching contact 49a is brought into contact with the contact 49c when the arm 31 is moved quickly. When the switch 49 is operated in the same manner as the switch 48, the transistors 112 and 116 are turned on and off in the opposite relationship to the case of the left feed, and the output terminal 113c of the output level control circuit 113 is turned on and off. and 113d, voltages having a relationship opposite to that in the case of leftward feeding are output. Therefore, in this case, the operational amplifier 125 has its inverting input terminal 125a at a low level and its non-inverting input terminal 125b at a high level, and outputs a positive manual operation signal to its output terminal 125c, which is input to the non-inverting input of the operational amplifier 71. feed at the end. As a result, a positive motor control signal is output to the output terminal 71c, which causes the transistor 79 to become 0 on, and its output current is supplied to the motor 39, thus moving the arm 31 to the right. Next, when the arm 31 in the lowering state is manually operated, the operation of stopping the arm 31 at the left and right limit positions will be described.

First, when manually operating the arm 31, the arm 31 is deflected in the operating direction to produce an output at the connection point 69 of the arm deflection angle detection mechanism 30, and based on this output, the motor 39
is rotated, thereby moving the arm 31 to the left or right. In this manual operation, the arm 31
When the left limit position A or the right limit position B shown in the figure is reached, it is stopped as follows. That is, during the above operation, the arm 31 is in the lowering state, so in the LED lighting control circuit 40, the switch 41 is closed, the transistor 99 is OFF, and the transistor 108 is OFF.
I'm getting turned on. Now, for example, when the arm 31 is moved to the left and reaches the left limit position A,
The switch 42, which had been in the open state until then, is now closed. As a result, a base current is supplied from the positive power supply terminal 96 to the transistor 99 through the diode 100 and the resistor 98, and similarly to the case described above, the transistor 99 is turned on and the transistor 108 is turned off, and the LED 33 is turned off. As a result, the output of the arm deflection angle detection mechanism 30 disappears, and the movement of the arm 31 is stopped. Furthermore, when the arm 31 is moved to the right and reaches the right limit position B, the switch 43, which had been closed until then, is opened, and the positive power supply terminal 96 is connected to the resistor 102, diode 103, and resistor 98. A base current is supplied to the transistor 99, and thereafter the LED 33 is
goes out. Therefore, in this case as well, the movement of arm 31 is stopped. As detailed above, according to the present invention, in an arm drive control device for a player equipped with a linear tracking arm, the deviation angle detection mechanism for detecting the deviation position of the arm is constructed using a photoelectric method. Since the light emitting elements of this deflection angle detection mechanism are made to light up gradually when they start lighting, when the arm is driven based on the output of the deflection angle detection mechanism, the arm can be smoothly driven at the start of the drive. The effect of driving the vehicle is obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of an arm drive control device shown as an embodiment of the present invention, FIG. 2 is a diagram showing the positional relationship of arms driven by the drive control device, and FIG. The figure is a circuit diagram showing an example of a specific configuration of the drive control device, FIG. 4 is a schematic diagram of main parts of the deflection angle detection mechanism 30 shown in FIG. 3, and FIG. FIG. 3 is a diagram for explaining a range of change in output voltage in FIG. 30... Arm deflection angle detection mechanism, 31... Arm, 32... Shielding means (slit plate), 33... Light emitting element (light emitting diode), 34a, 34b... Light receiving element ( CdS photoconductive cell), 40... Light emitting diode lighting control circuit.

Claims (1)

[Claims] 1. Detecting the deflection angle of the arm by a deflection angle detection mechanism,
In a player equipped with a linear tracking arm that drives the arm while correcting the deviation of the arm based on the detection result, the deviation angle detection mechanism is arranged between a light projecting element and a light receiving element that are arranged opposite to each other. Driving an arm in a player equipped with a linear tracking arm configured by interposing a shielding means that is deflected with rotation of the arm between the linear tracking arm and the light emitting element to gradually light the light emitting element when the light emitting element starts lighting. Control device. 2. An arm drive control device for a player equipped with a linear tracking arm according to claim 1, wherein the light projecting element is gradually turned on when the arm is lowered.