JPS59156174A - Drive controller for motor - Google Patents

Abstract

PURPOSE:To accurately stop at a stopping position by providing braking means for supplying reversing energy when speed control means and reverse governoring means for supplying pulsating energy when reaching the vicinity of the stopping position reach the stopping position. CONSTITUTION:When a start signal A is inputted, an input signal controller 13 is started, and a pulse signal is outputted so that the speed of a lens 12 becomes constant by a motor speed controller 20. When the position of the lens 12 reaches within the approaching range set in advance to the stopping position on the basis of the measuring information, a signal is supplied from a comparator 16 to a reverse governoring circuit 17, and energy for reversing the output of the controller 20 during the period of L is supplied. A clock pulse supplied from the comparator 16 is counted, and when the counted value becomes the prescribed value, a reverse pulse generator 18 is operated, and the reverse pulse is supplied during the prescribed period.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a drive control device that controls the operation of a motor, and in particular is extremely effective as a means for driving a lens in an automatic focusing device of a photographic camera. The present invention relates to a motor drive control device suitable for moving and stopping a motor in a very precise position.

Conventional Structure and Problems Various devices have been known that use a motor as a drive source to move and stop a desired object at a predetermined position.
As motor drive control devices for such devices, the following types of devices are known.

One of them is a motor drive control device that cuts off power supply to a motor when a desired object reaches a predetermined position.

However, in the case of the above device, the desired object moved by the motor is greatly influenced by the inertial force of the motor and the drive section provided between the motor and the desired object, so the stopping position is This has the problem of variations in the vicinity of a predetermined position.

However, there is another type of motor drive control device that supplies energy to the motor in a pulsating manner when the desired object approaches a predetermined position, and cuts off the energy supply when the desired object reaches the predetermined position. It is also known, for example, from Japanese Patent Application Laid-Open No. 100632/1999.

However, when attempting to obtain a more accurate stopping operation, the above-mentioned device also has the problem that it cannot sufficiently absorb the inertial force of the motor, etc. mentioned above. That is, since the state of energy supply to the motor is controlled by detecting and determining the position of the desired object in the middle of its movement with respect to the predetermined position at which it is desired to stop, the stopping position naturally has an arbitrary width. No, in order to obtain an accurate stopping position, it is necessary to set a small reference width for the amount of movement of the desired object. This means that the influence of the inertial force of the motor etc. cannot be fully absorbed.

Still another method is to reduce the energy supplied to the motor as the desired object approaches a predetermined position, and when the range of stopping positions that includes the predetermined position is reached, a reversal pulse is supplied to the motor to stop the motor. Devices for stopping the motor are also known. When configured as a single device, there is a problem in that it is difficult to accurately stop the rice at a predetermined position without causing a difference in the drive torque of the motor due to the various boiling factors mentioned above.

OBJECTS OF THE INVENTION An object of the present invention is to provide a motor drive control device that can move and stop a desired object in a predetermined position extremely accurately, which solves the problems of the conventional devices as described above. be.

Composition of the Invention The motor drive control device according to the present invention includes a speed detecting means for detecting the moving speed of a desired object moved by the motor, and a speed detecting means for detecting the moving speed of the desired object by the output of the speed detecting means. A speed control means that maintains the supply constant by controlling the supply; a reversing speed governor that provides a pulsating energy supply state when the desired object reaches the vicinity of the stop position; and a reversing speed governor that supplies reversing energy when the desired object reaches the stop position. In addition to a braking means, the motor is equipped with a structure that can absorb the influence of inertial forces of motors and drive members, and variations in power supply voltage.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a schematic electrical circuit diagram showing the basic configuration of the main parts of the motor drive control device of the present invention. -RF, F, and when its output terminal Q1 is at a high level (hereinafter referred to as H), energy is supplied to the motor. 2 generates a clock signal with a cycle corresponding to the moving state of the desired object being moved by the motor, that is, if the moving speed becomes faster, a clock signal with a shorter cycle is output, and conversely, if the moving speed becomes slower, a clock signal with a longer cycle is output. This shows the Glock output generator that outputs .

The clock output generating section 2 is configured using, for example, a so-called encoder member that is a combination of a contact piece and a conductive pattern formed between a moving desired object and a stationary member.

Reference numeral 3 indicates a reference clock output generating section which generates a reference clock output having a cycle that is used as a reference for determining whether the clock output from the above-mentioned clock output generating section 2 has a short cycle or a long cycle; When the reset terminal R4 is at a low level (as shown below), the output terminal Qo becomes L and the output terminal Qn becomes H after a predetermined time elapses from the time when the clock output from the reference clock output generation section 3 is supplied. 1 timer circuit is shown. The first timer circuit 4 determines the speed of the clock output cycle of the clock output generator 2, and the above-mentioned inversion operation of the output terminals QO and Qn is performed such that Qo is always inverted first. There is. 5 indicates a second timer circuit that performs the same operation as the first timer circuit 4, and in the case of its reset terminal R5 or L, after a predetermined period of time has elapsed from the time when the clock output of the reference clock output generator 3 is supplied. , output terminal Q
The state is reversed. The second timer circuit 5 is used to set the initial energy supply conditions to the motor, and until the previous reference clock output is supplied, the second timer circuit 5 changes to 5-RF, 5-RF, etc. depending on the state of its output terminal Q until the previous reference clock output is supplied.
Set F,1 to the set state, and set this S-RF,F,1
The output state of the motor is set to H, forming a state in which energy is supplied to the motor. 6 is triggered at 9 o'clock when the clock output from the clock output generator 2 rises,
T, F, and F are shown in which the state of the output terminal Q is inverted to H, 7 is an N07 circuit, 8 is an AND circuit, 9 is a NOR circuit, and 10 is an OR circuit, respectively.

Now, the operation of the circuit constructed as described above will be explained in detail with reference to the output state diagram of arbitrary constituent members in FIG. 1 shown in FIG.

First, due to the start-up operation in the motor drive circuit (not shown), each circuit is activated at time t in FIG.

The situation will be as shown in . At the same time, the motor starts driving, and naturally the desired object to be moved also starts moving, and the clock output generation section 2 using the encoder member
Therefore, when the clock output based on the H state as shown in FIG. 2(a) is supplied to T, F, F, and 6, . T
, F, F, 6., due to the rise of the supplied clock output, the state of the output terminal Q6 is inverted to H at time t2 as shown in FIG. and the reset terminals R4t and R5 of the second timer circuit 4 and the second timer circuit 5, respectively, to reset the respective timer circuits.

1st. The second timer circuits 4 and 5 are reset by the output signals of T, F, and F6, so that the states of their output terminals Qo, Qn, and Qs are as shown in FIG.
, to).

(As shown in 7f4, they are inverted to H, L, and L, respectively.

By the way, the above-mentioned 1. Of the output terminals of the second timer circuit 4.6, Qo is T, as is clear from FIG.
It is connected to the reset terminal R6 of F, F, 6, and therefore the output terminal Q of the first timer circuit 4. The inversion operation of T, F, and F dips into H at the rising edge of the clock output from the clock output generating section 2.

The state of output terminal Q6 of Q is shown in Figure 2 (b).
<It will be reversed to L immediately.

Therefore, the first. Since the state of the terminals R4 and R5 of the second timer circuit 4 and 501 immediately goes from R7 to L, as mentioned earlier, these timer circuits 4 and 5 are connected to the three reference clock output generation circuits.・If the reference clock output is supplied from the source, the state where the 60 o'clock operation is performed for a predetermined period of time, that is, the state where the operation of the clock that reverses the state of each output terminal after a predetermined period of time is performed. It will be done.

On the other hand, the clock output from the clock output generator 2 is N
It is also supplied to the input terminals of the OT circuit 7 and the N'ORNOR circuit 9, and the output terminal of the NOT circuit 7 is supplied to the AND circuit 8.
is connected to one input terminal of the

The other input terminal of the AND circuit 8 and the NOR circuit 9 is connected to the first
The output terminal Qn of the timer circuit 4 is connected to the output terminal Qn of the timer circuit 4. Therefore, T, F, F as mentioned earlier.

When the AND circuit s and the NOR circuit 9 are in operation, the output states of the AND circuit s and the NOR circuit 9 as shown in FIG.

That is, the AND circuit 8 is brought into the H state only while the clock output is L and the output terminal of the first timer circuit 4 is H;
The OR circuit 9 operates so that the output terminal of the first timer circuit 4 is in the H state only while the clock output is L and the output terminal of the first timer circuit 4 is L.

Further, the output terminal of the AND circuit 8 is connected to one input terminal of an OR circuit 1o whose other input terminal is connected to the output terminal Q5 of the second timer circuit 5, and therefore, the output terminal of the OR circuit 1o is connected to the output terminal of the OR circuit 1o. The operation is as shown in FIG. 2(A), when the output terminal Q5 of the second timer circuit 6 shown in FIG. 2(A) and the output of the AND circuit 8 shown in FIG. The only thing to do is to perform an operation such that the voltage is L only when the voltage is low.

The motor's speed open side 1 is supplied to the reset terminal RI + set terminal $1 of the motor, and therefore 3 RF, F, 1 is supplied to the reset terminal R4 as a reset signal, that is, a NOR circuit. Unless an H signal is supplied from 9, an H signal is output to the output terminal Q, and the state in which energy is supplied to the motor is maintained.

In addition to the configuration shown in FIG. 1 that operates as described above,
The movement speed of the desired object being moved by the motor is slow, and the relationship between the clock output period and the operation of the first Kuimer circuit 4 is not correct, for example, as shown in FIG. The time T from the rising time t2 of the power to the falling time t3 of the next clock output is the first
The time T until the output terminal Qn of the timer circuit 4 is inverted, if it is slower,
AND circuit 8°NOR circuit 9. O
Due to the output relationship of the R circuit 1o, no current signal is supplied to the S-RF, F, 1, and its output terminal Q1 is kept at H as shown in the figure. In other words, energy continues to be supplied to the motor.

Then, when the rotational speed of the motor becomes faster and the moving speed of the desired object becomes faster, the rise and fall of the clock output mentioned above becomes shorter than the interval T' and the output inversion period T1 of the first timer circuit 4. As shown in FIGS. 3(A) and 3(B), the relationship between T' and T' becomes shorter than that in FIG. 2, as shown in FIGS.

When such a situation occurs, the AND circuit s and the NOR circuit 9. The OR circuit 10 is shown in FIGS.
The operation shown in 2) will be performed.

That is, the output of the NOR circuit 9, which would never become H in the state shown in FIG. 2, becomes T' and T as described above.
1, an H signal is output. Therefore 5
The H signal of the NOR circuit 9 is not supplied to the reset terminal of -RF, F, 1, and while this H signal is supplied, the reset operation is performed to 5-RF, F, 1. become. 5-R) It goes without saying that F, F, 1 undergoes a reset operation, and the state of its output terminal Q+ is reversed, that is, set to L. As a result, the energy supply to the motor is reduced. will be suspended.

Note that when the output of the NOR circuit 9 is inverted due to the inversion of the output of the first timer circuit 4 and becomes L again, S-RF, F,
As is clear from Figure 3 (to), ()), and (2), since the output signal is supplied to the AND circuit (8), the output terminal Q1 of S-RF, F, and 1 is re-energized. HK is inverted and this state is maintained until an H signal is supplied from the NOR circuit 9.

As mentioned above, when the moving speed of the desired object becomes faster than the state shown in Fig. 2, it is clear from the state of the output terminal Q1 of S-RF, F, 1 that the energy supply state to the motor is continuous. The supply will change to a pulsating supply.

If the rotation of the motor is even faster and the moving speed of the desired object is also faster, the time T// from one rising edge of the clock output to the next rising edge will be equal to the time T// mentioned earlier, as shown in FIG. Since the predetermined time until the state of the output terminal Qn of the first timer circuit 4 is inverted is shorter than the predetermined time T1, the first timer circuit 4 is reset at the rising edge of the clock output before the output terminal Qn is inverted. Therefore, its output terminal Qn always maintains L.

As a result, the AND circuit 8, which was able to output the fiH signal by inverting the output terminal Qn of the first timer circuit 4 to H, also maintains its output terminal at all times. As a result, the 5-RF, F, and 1 cent signals outputted through the OR circuit 10, ie, the H signal of the OR circuit 10, are no longer output as shown in FIG. 4 (7).

Therefore, once the H signal of the NOR circuit 9 is applied, 5-RF, F
, when the set operation is performed, 5-RF, F will maintain the reset state unless a set signal is present, and its output terminal Q1 will maintain the L level as shown in FIG. 4 (OFF).

Needless to say, such a state is a state in which energy is not supplied to the motor; in other words, the clock output supplied from the clock output generator 2 is synchronized for a predetermined period T1 determined by the first timer circuit 4. If it becomes faster than this, the energy supply to the motor will be stopped.

In actual operation, when the rotational speed of the motor increases and the supply of energy stops, the rotational speed of the motor gradually slows down and returns to the state described in Fig. 3. As a result, the motor's rotational speed increases. The rotation speed is controlled to a predetermined speed determined by the predetermined time T1 set by the first timer circuit 4.

As described above, the main parts of the motor drive control device according to the present invention have an extremely simple configuration, and operate to control the energy supply to the motor according to the moving speed of a desired object. An arbitrary moving speed can be obtained by appropriately setting the predetermined time determined in the timer circuit 4 of No. 1, that is, the reference time for determining the moving speed of the desired object.

Now, a motor drive control device according to the present invention having the main parts as described above will be explained with reference to FIG. 5.

FIG. 5 shows a block diagram of an embodiment of a motor drive control device according to the present invention, which corresponds to the present invention when a motor is used as a drive source for a lens in an automatic focusing system of a camera, for example.

In FIG. 5, 11 is a motor that drives the lens 12, 13 is an input signal control circuit that starts the rotation of the motor 11, and 1
4 is a lens position detection circuit for detecting the position of the lens by an encoder member constructed on the lens 12, and 15 is an optical or other arbitrary method.

A distance measurement information generation circuit 16 generates information on measuring the distance to a subject (not shown) as an electrical signal. Comparison circuit for comparing distance information, 1
7 is a reverse speed governor circuit whose operation is controlled by the output of the comparison circuit 16 and controls the driving state of the motor; 18 is a reverse pulse generation circuit that generates a reverse pulse to stop the motor; 19 is a reverse speed governor circuit 1γ; Reverse pulse generation circuit 1
8. and a control circuit that controls the operation of a motor drive circuit 21 that drives the motor 11 based on a signal from a motor speed control circuit 20 that controls the speed of the motor.

It goes without saying that the motor speed control circuit indicated by number 20 in FIG. 5 corresponds to the circuit configuration explained in FIG. Figure (a) ~ (
Needless to say, the control circuit shown in figure 19 has a configuration as shown in figure 7, and terminals B, '
The electric signal generated at D, (, H, I outputs an H signal to terminals E and J, respectively, to rotate the motor forward or reverse.The operation of the actual sword example shown in Fig. 5 is as follows. This will be explained with reference to FIG.

In the embodiment shown in FIG. 5, as a result of distance measuring operation etc. in the camera body (not shown), when a start signal as shown in FIG. 6 (a) is supplied to point A in the figure, the input signal is The credit control circuit 13 is activated and outputs output signals as shown in FIG. 6(b) and 0'l at points B and C in the figure, respectively.

The output signal generated at point B is supplied to the reverse pulse generation circuit 18 and the control circuit 19, and the reverse pulse generation circuit 18 maintains the output state in which a reverse pulse cannot be generated, e.g. at point D (as shown in FIG. 6) at L. The control circuit 19 also controls the motor 1.
1, a normal rotation output is generated, for example, at point E, as shown in FIG. 6 ((e)).

Therefore, the motor 11 is driven by the output of the control circuit 19 via the motor drive circuit 21.

On the other hand, the output signal of the 0 point puts the lens position detection circuit 14 into the operating state, and when the motor 11 is driven as described above, the lens 12 also starts moving. An output signal as shown in Fig. 6 (f) is generated at point F. Needless to say, this signal is the clock output shown in (a) in FIGS. 2, 3, and 4, and the output from the lens position detection circuit 14 is as follows.
It is also supplied to the motor speed control circuit 2o and the comparison circuit 16.

Therefore, the motor speed control circuit 20 operates to open the control circuit 19 in response to the moving speed of the lens 12, which is the desired object, as explained in FIGS. 2 to 4.
For example, if the output signal shown in FIG. 6 is outputted to one point, it will be K.

The comparator circuit 16 compares the above output with distance measurement information, and when the position of the lens 12 reaches within a preset proximity range with respect to the stop position based on the distance measurement information, the signal shown in FIG.
As shown in (g), the state of point G, which is the output terminal, is reversed,
This output is supplied to the control circuit 19 and the reverse speed governor circuit 17. The detailed operation of the control circuit 1 will be described later in conjunction with FIG.
Q when the output terminal condition of the motor speed control circuit 20 is L
In order to reverse the motor 11, the output as shown in FIG.
It will be supplied to 1.

Therefore, the motor drive circuit 21 is controlled by the control circuit 19 whose operation was controlled by the output of the motor speed control circuit 2o explained in FIG. The control state is different from the control state based only on the presence or absence of supply, and is determined by the signal shown in the same figure (N) which is output to the output terminal J of the control circuit 19 by the output signal of the motor speed control circuit 20 shown in FIG. 6 (OFF). , motor 11
In this case, the energy necessary for conducting the electric current is supplied to the motor 11.

In reality, if the rotational speed of the motor 11 increases due to the above-mentioned operation and escapes, the output of the motor speed control circuit 20 will cause the motor 11V to increase as described above. C.

The first braking state in which no energy is supplied is caused to be formed in the snow/rain drive circuit 21 by the signal output to point E, and upon receiving the output from the comparison circuit 16, the motor speed control circuit 2o controls the motor 11. When the state is such that energy is not supplied to the
The motor drive circuit 21 operates to form the second braking state supplied to the motor drive circuit 21 by the signals output to the five points. On the other hand, the reverse speed governor circuit 17
The number of clock outputs supplied from point F is calculated by the signal supplied from point F, and when the counted value reaches a predetermined number, an output as shown in FIG. 6 is generated at point H in the figure, and the control circuit 19. It is supplied to the input signal control circuit 13.

By supplying the output from the reverse speed governor circuit 17, the control circuit 19 is placed in a state in which it cannot supply reverse energy based on the output of the motor speed control circuit 20 as described above.

On the other hand, the input signal control circuit 13 receives a signal from the reverse speed governor circuit 17, and inverts the state of the point B, which has been high due to the signal supply as shown in FIG. 6(a), to low. Therefore, the reverse pulse generation circuit 18, which had been in an inactive state, operates and outputs the output signal as shown in Fig. 6).
It will be output to a point. The signal is supplied to the control circuit 19, and :Ij! The control circuit 19 generates output signals for rotating the motor 11 in the reverse direction at five points as shown in FIG.

Therefore, the motor drive circuit 21 supplies energy to the motor 11 to reverse the motor 11 by the signal supplied from the control circuit 19, and as a result, the comparison circuit 1
6. Braking is performed by the operation of the reverse speed governor circuit 17, and the drive of the motor 11, whose inertial force is reduced, is abruptly and completely stopped.

Here, the operation of the motor drive control device according to the present invention described above will be explained with a focus on the motor 11. First, the motor 11 is started and starts rotating by the operation of the input signal control circuit 13, and the output of the comparison circuit 16 is Until the reversal occurs, the motor speed control circuit 20 as shown in FIG. Depending on the output state of the motor, if the output of the motor speed control circuit 20 becomes L, the output of the motor speed control circuit 20 becomes L, and the output is supplied. is carried out, and finally, when the above-mentioned reverse speed control period ends, the reverse rotation pulse is supplied by the reverse rotation pulse generating circuit 18 for a predetermined period of time, and the drive is completely stopped.

Therefore, the drive of the motor 11 is not affected by variations in the drive torque of the motor caused by the type of power source, friction of drive members, etc. in conventional drive devices, and is capable of extremely accurate drive control. In addition, it will be possible to move to a desired position at high speed and stop.

Finally, an example of the control circuit indicated by the number 19 in FIG. 5 will be explained based on FIG. 7 and with reference to FIG. 6.

In Figure 7, 22.23 is an AND circuit, 24°25 is N0
7 circuits, 26 indicates an OR circuit, and alphabet letters (
d1 It is assumed that it corresponds to an arbitrary point marked with an alphabetic character shown in Figure 5.

As is clear from the above description, when the H signal is output to the output terminal E, the control circuit 19 controls the motor drive circuit 21 to drive the motor 11 in a predetermined direction, and outputs the output terminal J[H If the signal is output, the motor drive circuit 21 is controlled to drive the motor 11 in a direction opposite to the predetermined direction. Therefore, now, at any point in time, the sixth
Starting signal or input signal control circuit 13 as shown in Figure (A)
As it is clear from FIG. Point E, which is a terminal, becomes H, and 11 is first driven in a predetermined direction.

At this time, if the other output terminal J is the AND circuit 22 or one point H
Receives the signal via the NOT circuit 26 and roughly compares it to the comparison circuit 1.
Since point G, which is the output terminal of No. 6, is at L, its output remains at L. Of course, point D is still valid, so L
maintain.

As explained in FIG. 1, the output terminal of the motor speed control circuit 2o may invert LK1 when the moving speed of the desired object, which is the lens shown in FIG. 6, increases. .

When point 1 is inverted to L, the output point E of the AND circuit 23 is
Needless to say, point B as shown in FIG. 6 (e) is reversed from H to L, and therefore the supply of energy to the motor 11 is stopped.

At this time, since the comparison circuit 16 at the other output terminal J is not yet operating, that is, the G point or LK has been maintained.
Since the output of the AND circuit 22 is Ll and the point D is also loud, the reverse pulse generation circuit 18 is inactive and is therefore L.
It is still maintained at L.

Then, the comparator circuit 16 operates, and the output at point G is shown in Fig. 6 ().
When LK is inverted to H as shown, the operation form of the AND circuit 22 changes.

In other words, since the H point in FIG. 5 can be maintained at L by the G point becoming H, if one point becomes L, the output of the AND circuit 22 can be inverted to H for the first time. be.

One point, needless to be described in detail, is the motor speed control circuit 2.
Therefore, when the G point mentioned above is L, the work point becomes L, and when the E point becomes L, the 5 points are HK inverted, and the motor drive circuit 21 or the motor 11 This will supply reversal energy.

Then, the reverse speed governor circuit 17 operates, and the H point becomes t- in FIG.
When it becomes H as shown in y, the output of the AND circuit 22 is
Since the H output at the H point is supplied as an L output via the NOT circuit 24, it becomes L.

On the other hand, the output of the A, ND circuit 23, that is, point E becomes L because the H output of point B 8 causes point B to become L as shown in FIG. 6(b).

At this time, as is clear from FIG.
In order to make the point H, the OR circuit 26 outputs a signal H' times the output of the AND circuit 22, which is L. The output of the OR circuit 26 is nothing but five points, and the reversal of these five points to H supplies the motor 11 with reversal energy.

Is the operation as described above explained in FIGS. 5 and 6 and is the operation of the embodiment shown in FIG. If the work point does not become L even if it is reversed and the G point becomes H, E
Needless to say, the point remains at H, and the motor 11 continues to be driven in the predetermined direction.

That is, in such a case, the driving torque of the motor 11 is small and the speed of the moving object is slow, and the braking by reversing the reversing pulse generation circuit 18 is enough to stop the object exactly and precisely at a predetermined position without applying reversing energy. be.

In other words, the control circuit 19 in the motor drive control device according to the present invention is configured such that a plurality of braking states are combined depending on the moving speed of the object moved by the motor, that is, the first braking state only cuts off energy for driving in a predetermined direction. The braking state and the second braking state, which supplies reversing energy when this is cut off, are appropriately combined with the third braking state, which supplies only reversing energy, taking into consideration the moving speed of the object. .

Effects of the Invention The motor drive control device according to the present invention can select up to three braking states of the motor depending on the speed of movement of the object being moved by the motor. This makes it possible to absorb differences in the acceleration state of the motor due to differences in movement amount caused by differences in drive torque and differences in movement start position.

If the desired object has still reached the vicinity of the predetermined position where it is desired to stop and the moving speed is fast, it is possible to select an intermittent energy T supply state including the supply of reverse upper and lower energy keys, that is, the moving speed of the desired object Since braking states with different braking torques can be selected depending on the motor's rotational speed and position, a large braking torque is supplied just before the motor stops, so the motor can be stopped abruptly.In other words, This has the effect of increasing the moving speed of the desired object.

[Brief explanation of the drawing]

FIG. 1 shows an example of the speed control means which is the main part of the motor drive control device according to the present invention.
4 is a diagram showing the output waveforms of various parts during the operation of the circuit shown in FIG. 1, and FIG. An example of application to an automatic focusing system is shown. Figure 6 is an output waveform diagram when the device is operating at each point in the block diagram shown in Figure 5, and Figure 7 is indicated by number 19 in Figure 5. FIG. 2 is an electrical circuit diagram showing an example of a control circuit. 2... Clock output generation section, 3... Reference clock output generation section, 4, 5... Timer circuit, 11... Motor, 16... ...Comparison circuit, 17...Reverse speed governor circuit, 18...
Reverse pulse generation circuit, 19... Control circuit, 20
...Motor speed control circuit, 21...Motor drive circuit. Name of agent: Patent attorney Toshio Nakao and 1 other famous painting 1
Figure 2 Figure to Bunch L12 1J
3Figure 3

Claims (4)

[Claims] (1) A drive control device for a motor that moves a desired object to a predetermined position and stops it, which detects the moving speed of the desired object moved by the motor and outputs a speed control signal to control the speed of the motor. a speed control means, detecting the position of the desired object, detecting that the desired object has reached the vicinity of the predetermined position, sends a first drive control signal, and detecting that the desired object has reached the predetermined position, sends a second drive control signal; a reversing speed governor that outputs a drive control signal, and a first braking system that is operationally controlled by the speed control signal and can intermittently supply drive energy for moving the desired object;
forming a second braking state, the operation of which is controlled by the first drive control signal and capable of supplying reverse energy when the driving energy is cut off in the first braking state; A motor drive control device comprising: a control means that is controlled by a drive control signal to form a third braking state in which supply of the drive energy is stopped and only energy in the opposite direction is supplied for a predetermined period of time. (2) The speed ml control means includes a clock output generation unit that generates a clock output with a period corresponding to the moving speed of the desired object, and a reference clock that generates a reference clock output that determines the length of the period of the clock output. an output generating section, a timer part that is reset by the clock output and starts a timekeeping operation for a predetermined time by being supplied with the reference clock output, and a timing at which the output of the timer part and the clock output are supplied. The motor drive according to claim 1, further comprising a determination unit that determines the moving speed of the desired object and outputs a speed control signal that controls energy supply to the motor in order to keep the moving speed constant. Control device. (3) The reverse speed governor includes a position detection circuit that detects the position of the desired object as an electric signal, and compares an output of the position detection circuit with an electric signal corresponding to the predetermined position, and detects the position of the desired object as an electric signal. a comparator circuit that detects arrival in the vicinity of a predetermined position and generates a first drive control signal to be supplied to the control means; The motor drive control device according to claim 1, comprising a reverse speed governor circuit that detects that the object has reached the predetermined position and generates a second drive control signal that is supplied to the control means. . (4) The control means includes a motor drive circuit that rotates the motor in a predetermined direction or the opposite direction, and a motor drive circuit that rotates the motor in a predetermined direction or the opposite direction;
a reversing pulse generation circuit that operates in response to a control signal and generates a parnu output that reverses the motor; the speed control output; and the motor drive circuit that is supplied with the first drive control signal and the pulse output; The motor drive control device according to claim 1, comprising a control circuit for controlling the operation of the motor drive control device.