JPH0469635A - Motor driving device for camera - Google Patents

Abstract

PURPOSE:To complete a motor driving action for as a short time as possible and to prevent the malfunction of a circuit by simultaneously driving plural motors and separating one motor from a power source when another motor is energized in a reverse direction in order to stop it. CONSTITUTION:Commands CMD0, CMD1, CMD2, CMD3 and CMD4 are transmitted from a CPU 501 to an I/0IC 502, and the motor M1 for winding a film is driven to be normally rotated and the motor M2 for charging a mechanism is normally rotated to wind the film and to charge the mechanism. A CPU 501 calculates the number of pulses 1 obtained until starting the reverse energizing and judges timing for performing the reverse energizing. When the charge of the mechanism is finished, the motor M1 is energized in a reverse direction. When the charge of the mechanism is not finished, the motor M2 for charging the mechanism is turned off. As soon as the reverse energizing is finished, the motor M1 is turned off. When the charge of the mechanism is not finished, the motor M2 is driven again so as to charge the mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera motor drive device in which a plurality of motors charge each part of the camera, wind the film, and the like.

[Prior Art] Conventionally, it has been known to use a plurality of motors to individually charge each part of a camera (for example, a shutter, an aperture, etc.) and advance the film.

In such cases, the plurality of motors are often started at the same time, for example, after the shutter operation is completed. This is due to the desire to complete the operation in as short a time as possible and transition to a state in which the next photograph can be taken. However, when a plurality of motors are started at the same time, the power supply voltage decreases, which may impede the driving of the motors and the operation of control means such as a microcomputer.

Therefore, some cameras that drive multiple motors at the same time are designed to stop one of the motors when it is detected that the motors are not operating in a predetermined manner (for example, Japanese Patent Laid-Open No. 169626/1983) reference).

Furthermore, after the shutter operation is completed, instead of driving multiple motors simultaneously, there is a device that controls the drive by staggering the start of energization to the motors (Japanese Patent Application Laid-Open No. 6118363
(See Publication No. 0).

[Invention or Problem to be Solved] By the way, is it known that in order to complete the motor l) k movement in the shortest time, it is necessary to reversely energize the motor during the stop operation? The polarity of the voltage and the voltage generated by the motor are in the same direction, and a current approximately twice the normal starting current flows. This increases the voltage drop due to the internal resistance of the power supply, causing the battery voltage to drop significantly.
The circuit may malfunction. One possible way to prevent this is to monitor the battery voltage, stop energizing the motor when it drops below a certain value, and restart energizing when the voltage returns.

However, when a plurality of motors are driven, the voltage may further drop and the circuit may malfunction. Furthermore, for example, if one charging motor is driven while the other motor is reversely energized, a considerable amount of current is taken away by the latter motor that is reversely energized.
The former motor will be in the same state as if the brake was applied, and the motor speed will actually be slow. Therefore, even if the reverse energization ends and the former motor is energized for the remaining time until the former motor is fully charged, it will take time for the speed to come up even if the former motor is energized. takes a long time.

The present invention solves the problem described in "-", and when driving multiple motors simultaneously and energizing in the opposite direction to stop one motor, the other motor is disconnected from the power supply. Accordingly, it is an object of the present invention to provide a camera motor drive device that can complete a motor drive operation in the shortest possible time and prevent circuit malfunctions.

[Means for Solving the Problems] In order to achieve the object stated in item 1, the present invention provides a camera motor drive device that is equipped with a plurality of motors each responsible for charging each part of the camera and feeding the film at almost the same time. A plurality of motors are started to be driven, and one of the motors is energized in the opposite direction to perform a stop operation when a predetermined stop timing of the motor is reached; The other motor is equipped with a control means for cutting off the power supply while the other motor is in use.

In the following embodiment, one motor is a film winding motor M1, and the other motor is a mechanical charging motor M2, and the former is controlled with priority over the latter. The control stage is composed of CP IJ 5 Ql.

"Operation" According to the above configuration, a plurality of motors are simultaneously driven by the control means, one motor is reversely energized at a predetermined stop timing to perform a stop operation, and when the reverse energization is started, If the other motor is currently being driven, the power supply to that motor is cut off and the motor is placed in a free running state.

When the reverse energization ends, power supply to the motor which was in the free running state is restarted and the motor is in the driving state again. Normally, the time for reverse energization is short, so the free run motor speed does not slow down much during this time, and when the motor is not energized again, it immediately reaches the speed of )[;, and the time it takes to complete driving is It becomes.

1. In the embodiment described above, the operation by the control means described in -1.7 is performed in steps #120 and #12 of the flowchart in FIG.
2, #124, when the former motor is reversely energized, the latter motor is turned off.

[Effects of the Invention] According to the present invention, a plurality of motors are started to be driven substantially simultaneously, and when one motor stops, the motor is energized in the opposite direction, and while this reverse energization is being performed, In this case, the other motor is in a free running state. I wanted to,
During reverse energization, even if a large current is taken by the reverse energization motor and the power supply voltage drops, the other motor will not be affected by this and the motor speed will suddenly slow down, and after the reverse energization ends, When power is resumed to the motor that was in the free-running state, it immediately returns to its original speed, and the overall time until the drive is completed is correspondingly shortened.

Also, if the other motor is also energized during reverse energization,
This can prevent a significant drop in the power supply voltage and a large possibility of malfunction of the circuit.

"Example" FIG. 1 is a cross-sectional view of the upper right film mechanism section, and corresponds to the view taken along the dashed line in FIG. 2. FIGS. 2 and 3 are plan views of the film winding mechanism section, The film winding state and the state when reverse current is applied are shown, respectively.

The film winding motor 1 is fixed to an upper base plate 30 that supports the winding section 8M. A gear 3 is rotatably installed at the tip of the output shaft 1a of the motor J via a compression spring 2, and if a force greater than the value applied to the gear 3 is applied, the output shaft 1a and the gear 3 will slip. Generally, when winding a film, the output shaft 1a and the gear 3 rotate together. The gear 3 is a large gear portion 4a of the gear 4 that is rotatable around a shaft 5 that is caulked to a lower base plate 40 that supports the hoisting mechanism portion.
The small gear portion 4b of the gear 4 meshes with the large gear portion 6a of the gear 6 which is rotatable around the shaft 7. The shaft 7 is caulked to the planet base plate 8, and the second part 7a of the shaft 7
The lower part 7b of the shaft 7 is fitted into the six 30a of the two-part base plate 30 and the six 7b of the lower base plate 40, respectively, and is rotatable.
It rotates together with the planet base plate 8. Tip part 8a of planet base plate 8
is a stopper pin 12a caulked to the lower base plate 40,
, 12b, and their rotation is restricted. A planetary gear 10 that meshes with the small gear portion 6b of the gear 6 is rotatably supported on a shaft 9 caulked to the planetary base plate 8. Board 8
A spring 11 is provided that provides a frictional force to rotate the .

The planetary gear 10 is arranged opposite to the gear 13, and the planetary base plate 8
As shown in FIG.
．． When it is in contact with a, it is in mesh with the gear 13, and as shown in FIG. 3, when it is in contact with the stopper pin 12b, it is out of mesh with the gear 13. The gear 13 is rotatable around a shaft 21 caulked to the lower base plate 40. A kick spring 14 is wound around the gear 13, and the arms 14a, 14. b is arranged across a boss 30d fixed to the upper base plate 30, and when the gear 13 rotates counterclockwise in FIGS. 2 and 3, the arm 1'4a of the kick spring 14 rotates. boss 3
0d and slides between the gear 13 and the A-tooth spring gear 4. When the gear 13 rotates clockwise, the arm 14b of the kick spring 4 hits the boss 30d and also slides between the gear 13 and the kick spring 14. This is to prevent the elasticity of the film wound around the spool 17 or the film itself from moving when the mesh with the resin 3 is disengaged, and the amount of sliding force is set so as not to satisfy this condition.

A gear 15 rotatable around a shaft 21 is provided above the gear 13.
are arranged, and the gear 13 and the gear 15 are connected to the convex portion 1 of the gear 13.
3a and the concave portion 1.5a of the gear 15 are connected by means of a screw so that they rotate together. Gear 15 is spool 17
The spool 17 is engaged with the gear portion 1.7a of the spool 17, and rotates the spool 17. An encoder 18 is rotatably provided around a shaft 19 stamped on the lower base plate 40.
The large gear portion 4a of the gear 4 meshes with the gear portion 18a.

The pulse plate 18b of the encoder 18 is connected to the upper base plate 3.
Photointerface pig 2 fixed to boss 30c of 0
It is inserted between the light emitting part and the light receiving part (interrupter PII in FIG. 5), and generates a pulse 1, which will be described later, in response to the rotation of the motor 1.

Note that the upper base plate 30 and the lower base plate 40 are connected by a plurality of bosses 301 on the upper base plate and fixed to the body 50.

FIG. 4 is a plan view of the spool 17.

In the figure, the roller bolt 60 has a roller 60a at its tip.
It has the function of pressing the spool 17 and winding the film F around the spool 17. The sprockets 1 to 70 rotate as the film F is wound onto the spool 17. Encoder board 80 is sprocket 70
A contact piece 8.1.82 slides on the top of the encoder board 80 to generate a pulse 2, which will be described later.

FIG. 5 is a circuit diagram showing a camera motor drive system to which the present invention is applied. A camera control microcomputer (hereinafter abbreviated as CPU) 501 performs functions such as sequence control of the entire camera, calculation control of exposure, calculation control of O1 to focus, and controls the film winding motor M.
Command CMD for controlling l (corresponding to motor 1 mentioned above)
Output terminals D9 to D1.1 for sending O to CMD2, and for controlling the motor M2 for operating the aperture locking member and mirror (not shown) and for shutter charging (hereinafter abbreviated as mechanical charging): I cloak CMD3. Output terminal D that sends CMD4]2. D13 and output terminals D14 to D that send commands CMD5 to CMD8 for controlling various magnets.
It is equipped with an i7.

SWI-SW4 are switches, one of which is grounded, and the other connected to input terminals D1-D4 via signal lines 81-S4. SWI is a light metering and distance measuring switch that is turned on at the first step of pressing down the release button (not shown), and this switch SWI is turned on.
When a signal indicating that the CPU 501 has become
performs photometry and distance measurement. SW2 is a release switch that is turned on at the second stage of the release button, and when this switch is turned on when the release is possible, the mirror is raised, the aperture is controlled, and the shutter curtain is moved. SW3 turns ON and OFI by rotating sprocket 1~. Generate pulse 2 using the switch.

SW4 is a switch (not shown) for detecting the end of mechanical charging, and is turned ON when mechanical charging ends. R, E.S.
ET is a reset terminal that is pulled up to +VDD by a resistor R1, and the CPU 501 resets it when it changes from L level to l-I level. X is an oscillator for providing a clock signal to the CPU 501.

Next, an interface IC (hereinafter abbreviated as 110IC) 5 transmits instructions from the CPU 501 to each part of the camera and signals from each part of the camera to the CPU 501.
02 and each control section will be explained. ICMg, 2C
Mg is a magnet (not shown) for holding the first and second shutter curtains, and is connected to the output terminal P23 of the I/0 IC502. P
When a 1-signal is sent from 22, the magnet], CMg
, 2CMg is energized to hold the shutter in the first or second curtain.

The time it takes to release the hold on the first act and release the hold on the second act corresponds to the shutter speed. RMg is a release magnet (not shown), which is connected to the output terminal P20 for a certain period of time [
, when a signal is output, the magnet I-RM g is energized, the release member is unlocked, the diaphragm starts to move in the direction of stopping down, and the mirror moves up.

FMg is a magnet (not shown) of the diaphragm locking part, and when the - times signal is output from the output terminal P21, the magnet FMg is energized to operate the diaphragm lock and hold the diaphragm locking member in a predetermined position. Lock it in place.

Q1 to Q6 are transistors 1 to 1 for driving the film winding motor M1. This winding motor M1 has two types of coils inside, and has characteristics of high torque and low rotational speed (■-characteristics) and characteristics of low l~lux and high rotational speed (1-characteristics).
-1 characteristic), and the transistors Q1 to Q6 are connected so that switching between the I-1 characteristic and the I-1 characteristic and forward/reverse rotation of each are possible. The L terminal of motor M1 is connected to the common connection point of transistor QIQ6, and the 1-I terminal is connected to the common connection point of transistors Q2゜Q5.
The child is transistor Q3. They are each connected to the common connection point of Q4. Motor M1 rotates in the forward direction,
It is designed to wind the film. As shown in Table 1, by turning on and off transistors Q1 to Q6, motor M1 can be stopped, rotated forward (H/L), or reversed (H/L).
L), brake (l(/L)). Also, the capacitor C1 is inserted to suppress the GND voltage fluctuation of the motor drive element caused by repeated ON and OFF of the motor M1 to a level that does not cause the circuit to malfunction. Note that the H brake and reverse H drive are not used in this embodiment. (Hereinafter, blank space) 1st
Table 2 QI Q2 Q3 Qll Q5 Q6 Motor M1 drive status OFF OFF OFF OFF OFF OFF
OFF Stop ON OFF OFF ON
OFF OFF Normal rotation and drive OFF ON OFF
F ON OFF OFF Forward rotation forward rotation drive OFF
OFF ON OFF OFF ON
Reverse rotation drive OFF OFF ON OFF
ON OFF Reverse H drive OFF OFF O
FF ON OFF ON BrakeLor
r OrF OFF ON ON or
r frame-tHCHD CHD CHD Pi P2
P3 P4 P5 P6 Motor H101
2 Drive state 1-I HHHHHL L L Stop HL
L L HHHL L Forward rotation LHL H] (
L HHL L Forward rotation 11L HL HHL
L L H Reverse LL HHHHL L
HL Reverse HL L L HHHHL H Brake LL L II HHHHHL Brake H
In addition, in order to turn on and off each transistor as described above, the CPU 501 to l10 must be turned on and off as shown in Table 2 below.
It is sufficient to send commands CMDO to CMD2 to the IC 502 and set the logical values of the output terminals P1 to P6.
(Hereinafter, blank spaces) Q7 and Q8 are transistors for driving the motor M2 that charges the aperture locking member, mirror, and the first and second shutter curtains that are unlocked by the release operation. CPU5 as shown in Table 3 below
01 to command CMD3. By sending CMD4, transistors Q7 and Q8 are turned on.

0FFL, the driving state of motor M2 can be controlled.

Table 3 CHD3 CHD4 Q7 Q8 Motor M2 drive status HHOFF OFF Stop L )-1ON OFF Forward rotation L L
OFF ON Brake pH is a photointerrupter (corresponding to 20 mentioned above), which generates a pulse wave by rotation of motor M1. This pulse wave is input to Ilo 1C502 from the input terminal P1.9, the waveform is shaped by the waveform shaping section, and the pulse 1 is output from the output terminal P18.
and sends a signal to the CPU 501.

Next, a reverse energization brake for film winding will be explained. Commands CMDO, CMD1 . CMD2 to H and L respectively
, L, the motor M1 performs forward rotation LWIA motion. This causes gear 3 to rotate counterclockwise, causing gear 4 to rotate clockwise, and gear 6 to rotate counterclockwise. The planet base plate 8 has a tin ring 11 between it and the planet gear 10.
Since the frictional force is applied by the shaft 7, the planet base plate 8 rotates counterclockwise as a unit, the tip 8a of the planetary base plate 8 hits the stopper pin 12a, the planetary gear 10 and the gear 13 are engaged, and the gear 13 is rotated counterclockwise. It rotates clockwise and the gear 15 also rotates counterclockwise, causing the spool 17 to rotate counterclockwise in FIG.

As a result, the film is wound around the spool 17. Note that while the gear 13.15 is rotating counterclockwise, the arm 14a of the kick spring 14 touches the boss 30 of the upper base plate 30.
d, and slipping occurs between the gear 13 and the kick spring 14. Furthermore, when the gear 4 rotates, the encoder 18 also rotates, and the photo interrupter PII outputs pulse 1.
generate. On the way, when the time interval of this pulse 1 becomes 1゛1 in the predetermined time direction, the CPU 501 issues a command CMD.
O.

CMDI and CHD2 are sent as l-I, L, and H, respectively, and the motor M1 is switched to normal rotation I] drive to increase the film winding speed.

On the other hand, as the film is wound up, the sprocket 70 rotates counterclockwise. As a result, the encoder board 80 also rotates, and pulse 2 is generated. As this pulse 2 advances one frame of film, 8 pulses become C.
l" tJ 50 ]. The number and pulse speed of pulse 1 generated during the period of pulse 2 are expressed as CP.
It is monitored by U501, and one constant of pulse 2 that is predicted to occur during reverse energization is calculated as the reverse energization start timing. When the reverse energization start timing comes, the CPU50
From 1, commands CMDO, CMDI, and CMD2 are respectively obtained. , i-I, 1. , as l10IC50
2, and the motor M1 is reversed to 1. drive. Reversal 1
Even if the motor M1 is moved by +j, at first the motor M1 rotates counterclockwise due to inertia, the gears 10 and 13 are engaged, and the film is wound by -6. When , the polarity of the power supply voltage and the voltage generated by the motor are in the same direction, and a current approximately twice the normal starting current flows.

As a result, the voltage drop due to the internal resistance of the power supply increases, and the battery voltage drops extremely as shown in Figure 15. For example, if the voltage drops below the voltage ΔE (V), the circuit may malfunction. be.

Therefore, in this embodiment, in order to prevent this malfunction,
The 1C502 is equipped with a reverse energization control section and a reverse energization detection section, and the reverse energization detection section monitors the power supply voltage, and as shown in Fig. 16, the power supply voltage is set to the minimum voltage Δ that does not cause the circuit to malfunction.
When E (V) is reached, the reverse energization control section sends a signal to turn off transistors 1 to Q6, and the reverse energization is turned off. After that, when the power supply voltage is restored, the transistor Q
Turn on 6 and enter Daotong'tun. This operation is repeated until the reverse energization stop timing is reached. As a result, the power supply voltage of the circuit is maintained above ΔE (V), thereby eliminating malfunction of the circuit. In addition, at this time, CP tJ 50
The commands CMDO, CMD], CMD2 from 1 remain at H and I-, respectively.

After transitioning to the reverse energization state, the counterclockwise rotational speed of motor M1 gradually slows down, the time interval of pulse 1 suddenly becomes longer, motor M1 stops, and immediately begins to reverse, and gear 3 rotates clockwise. Rotate to . Then, contrary to the rotation, the gear 6 rotates clockwise, the planetary base plate 8 also rotates clockwise, and the tip 8a of the planetary base plate 8 hits the pin 12b, causing the planetary gear 10 and gear 13 to mesh with each other. Disconnected, motor M
1 is no longer transmitted to the spool 17, the spool 17 stops, and film feeding is completed. In addition, spool 1 is written by Tenshi Yon of Furuno \ own book.
I try to move 7, but kick spring 14 and gear 1
3, the kick spring 14 and gear 13 are set to be stronger than the film tension.
will not slip, and the spool 17 will remain stationary.

-17. As mentioned above, after the motor M1 starts rotating in the opposite direction, the time interval of pulse 1 becomes shorter again. Details will be described later, but as shown in Figure 171,
The interval between pulses 1 during reverse rotation changes from 11 < 1°2 to t, 2 > t3 > t, 4. When the time interval of this pulse 1 is short twice in a row, the CPU5
01 to command C'MI)O, CMDI, CMl)2
](,1(,]−,i, respectively), and the motor M
1 is stopped and 1- is stopped, = film charging is completed.

At this point, stop the motor M1 as quickly as possible.
In order to do this, motor M1 should be stopped immediately when the time interval of pulse 1 becomes shorter than the previous time, but if the time interval of pulse 1 becomes shorter than the previous time due to the beginning of reverse energization or noise Sometimes it happens. In order to prevent malfunctions in such cases, the motor M1 is stopped when the pulse speed increases twice in succession.

Okay, before the number of pulses 1 generated during this reverse energization does not reach the expected number of reverse energization pulses calculated above, the pulse]
When the time interval becomes shorter twice in a row and it is time to stop the reverse energization, it is assumed that the film was forced to stop during the reverse energization, so the speed of the motor M1 suddenly dropped to zero and started rotating in the opposite direction. Therefore, it is determined that the film has been wound to the final stage 1. Note that turning off the motor M1 when the power supply voltage drops below a level that would cause the circuit to malfunction is applied not only during the reverse energization period but also at the time of starting the motor energization. For example, when the exposure is completed and the film is wound up
If the charging motor M1 and the mechanical charging motor M2 are driven at the same time, the load will become large and the power supply voltage will drop. At this time, one motor, for example motor M2, is turned off.
When the power supply voltage is restored after being turned on, the power supply voltage can be prevented from dropping by turning it on again to perform charging.

Next, the C for film winding and mechanical charging.
The control procedure by the PU 501 will be explained based on the flowcharts shown in FIGS. 6 to 13. When switch SW1 is pressed, the camera performs photometry and distance measurement, and when switch SW2 is pressed, the release magnet RMg is energized to unlock the aperture, and when the predetermined aperture value is reached, the aperture locking magnet l-FMg is energized. Release the diaphragm, hold the aperture in place, raise the mirror, and attach the magnet ICMg, 20Mg.
The energization to is released, the first and second shutter curtains are run, and the film is exposed. Thereafter, the CPU 501 winds the film and performs mechanical charging.

FIG. 6 shows the film winding and mechanical charging routine. First, step #100 (abbreviated as #100).

(Same below), from (2PU50) to I10■C502 command CMD O, CMD 1., CMD2.CM
D3. CMD4 respectively I-I, L, L.

The motor M1 for film winding is driven in normal rotation, and the motor M2 for mechanical charging is driven in normal rotation to wind up the film and charge the mechanism. and,#
After resetting timer TMR1 in #101, pulse 1, pulse 2, switch SW4, and timer T are reset in #102.
The interrupt of MR,1 is enabled, and in step #104, a wait is made until an appropriate number of pulses 2, for example 4, are generated. #
If pulse 1 occurs during the 1o4 time wait, the 7th
The process moves to pulse 1 interrupt processing 1 shown in the figure, and when pulse 2 occurs, the process moves to pulse 2 interrupt processing shown in FIG. Moving on to interrupt processing,
If pulse 1 does not occur even after the predetermined time T2 has elapsed,
The process moves to the interrupt processing of timer TMR1 shown in FIG. 13, that is, the tension processing.

Pulse 1 interrupt processing 1 starts with timer T at #200.
Read MR1 and set this value to T.

Then, if the value T read in #202 is predetermined and the switching time from drive to H drive is shorter than ゛■゛1, proceed to #204, and □ drive the motor M1 in normal rotation.
In #208, T1 is set to a predetermined value T11 (shorter than TI), and the process proceeds to #212. If T is longer than T1, the process proceeds to #206, where the motor M1 is driven in the normal rotation, a predetermined value T1. (longer than Tl) is set to 1210'''C'T], and the process proceeds to #212. Timer T at #212
MR], then return to #104 described above. In this way, by changing the value of the switching time 1゛1 to Tl+ and TI in the H drive and I- drive, hysteresis is provided, thereby preventing the drive state from changing frequently.

The pulse 2 interrupt process is a routine that counts the number of pulses 2, and in step #305, the pulse 2 counter is incremented by 1 and the process returns.

In the interrupt processing of SW4, a mechanical charge end flag is set in #355, and the brake is applied to motor M2 for a predetermined time TB in #360, and the process returns.

When the timer TMR1 interrupt processing is started, it can be determined that the motor M1 is not rotating due to tension at the end of the film, so the process moves to the processing routine for film tensioning at #405.

When four pulses 2 are generated, #104 to #1 in Figure 6
Proceed to 06. Here, as a preparation for determining the reverse energization start timing, we will first use a pulse 1 counter A that counts the number of pulses of pulse 1 from the 4th to 7th pulse of pulse 2, and a pulse 1 counter A that counts the number of pulses of pulse 1 from the 4th to 7th pulse of pulse 2 Pulse 1 until onset
The pulse 1 counter B, which counts the number of pulses, is cleared to zero. Next, in #107, pulse 1 interrupt processing 2 shown in FIG. 8 is permitted. And #1
Wait until 6 pulses 2 are generated at 08. If pulse 1 is input during this standby, the process moves to pulse 1 interrupt processing 2. In this process, first, in #220, the H of motor M1 is
/L drive switching.

The contents of this process are the same as those in #200 to #212 described above, so the explanation will be omitted. Next, proceed to #222 and pulse 1
Add 1 to counter A. Then, at #224, pulse 2
Determine the counter. If the value of the pulse 2 counter is not 6 (that is, 6 pulses 2 have been generated), the process returns directly. (If the value of the process 2 counter is 6, #226
Proceed to )(Add 1 to Lux 1 counter B and return.

When 6 pulses 2 are generated, i < 6 of pulse 2 at #109.
To find the time from the first shot to the seventh shot, use the timer TM.
Reset R, 2, wait until the value of the pulse 2 counter reaches 7 in #110, and when 7 pulses 2 are output,
The timer TMR,2 at #111 is read to find the time from the 6th to the 7th pulse 2.

Next, proceeding to #112, the CPU 50 calculates the number of pulses of pulse 1 until the start of reverse energization. That is, here, the value of pulse 1 counter A, which stores the number of pulses of pulse 1 from the 4th to 7th shot of pulse 2 calculated earlier, and the value of pulse 1 counter A, which stores the number of pulses of pulse 1 from the 4th to 7th shot of pulse 2, and The value of pulse 1 counter B, which stores the number of pulses 1, and the timer TMR, which is the time from the 6th to the 7th pulse 2.
Based on the value of 2, the number of pulses of pulse 1 from the 7th pulse of pulse 2 to the start of reverse energization is calculated. Then, set this in the pulse 1 counter C. Next, in #114, the scheduled pulse of pulse 1 that is predicted to occur from the 7th pulse of pulse 2 until the reverse energization is stopped is calculated from the above value, and this is calculated from the pulse 1 counter D.
Set it to .

Next, in #116, pulse 1 interrupt processing 3 shown in FIG.
It waits for the reverse energization flag to be set to 1 when the number of pulses 1 reaches the value of the pulse 1 counter C obtained by the previous calculation in #118. When pulse 1 is input during this standby, pulse 1 interrupt processing 3 shown in FIG. 9 is executed.

When this process starts, H/L drive is switched in #240, and in #242. Pulse 1 counter C, D at #244
, and proceed to #246 to determine the value of the pulse 1 counter C. If it is not zero, it is determined that pulse 1 sufficient to start reverse energization has not been output yet. 1. Return as is. When the value of the pulse 1 counter C becomes zero, it is determined that it is time to perform reverse energization, the process proceeds to #250, the reverse energization flag is set to 1, and the process returns.

When the reverse energization flag is set to 1, #120 in FIG.
Proceed to. At this time, if the mecha charge is finished and the mecha charge end flag is 1, continue #] 2/
Proceed to 1/\ and energize the motor M1 in the reverse direction with L drive, but if the mechanical charge is not finished yet and the mechanical charge end flag is set to 1, proceed to #122 for mechanical charge. Turn off motor M2 and proceed to #124. Then, in #125, pulse 1 interrupt processing 4 shown in Section 10 is enabled, and in #126, the CPU waits for a time until the reverse energization flag is cleared to 0.

When pulse 1 is input during this standby, the process moves to pulse 1 interrupt processing 4 shown in FIG. 10, and first, in step #260, the pulse 1 counter D is decremented by 1. Then, read timer TMRI at #262, and set timer A to tl, t2 . t3. Store t4... #
In #264, compare the time interval of the previous pulse 1 with the stored value of timer B, and if the time interval of timer A (current time) is longer, set pulse 2 counter E to 2 in #265. Then, in #272, the value of timer A is assigned to timer B, and the process returns to #126. 2 to pulse 2 counter E
The purpose of setting is to detect that the pulse speed has become faster twice in succession as described above. If the time interval of timer A is shorter, the pulse 2 counter E is decremented by 1 in #266, and in #268 it is determined whether the value of the pulse 2 counter E is zero, and if it is not zero, the pulse 2 counter E is decremented by 1.
If it is zero, it is determined that motor M1 has started to reverse, and the process goes to #274, where the reverse energization flag is cleared to O, and #
Return to 126.

When reverse energization is completed, proceed to #128 and immediately turn on motor M.
Turn off 1. Then, check the mecha charge end flag in #130, and if the mecha charge has not ended, #
The process proceeds to #132, where the motor M2 is driven again to perform mechanical charging, and the process proceeds to #134. If the mechanical charge has been completed, the process directly advances to #134, and it is determined whether the value of the pulse 1 counter D, which stores the number of pulses scheduled for reverse energization, is zero. If this becomes zero, the process proceeds to #136, where the film count is incremented by 1 and winding is completed. If it is not zero, the stop timing came earlier than planned, so
It is determined that the film is stretched, and the process proceeds to #140 to proceed to the film tension processing routine.

After the process in #136 is completed, the process proceeds to #138, a photometry and distance measurement routine.

Note that the method of stopping the motor by applying reverse energization can be applied to the above-mentioned film winding motor M1, as well as controlling the focusing operation of the lens or controlling the zooming operation.
Furthermore, it can be applied to aperture control, mirror control, etc. And these motors that are reversely energized and stopped,
The object of the combination of the other motor, which is turned off (free-running state) during reverse energization, is controlled more preferentially than the latter; for example, the former is not used for film winding. , the latter can be set for mechanical charging (corresponding to the above embodiment) or for controlling the focusing operation of the lens.When applied to any of these controls, a large amount of driving can be performed in a short time, and , can be performed with high precision.

In the above embodiment, the motors M1 and M2 may be started to be driven at exactly the same time, or the timing of their start may be slightly different.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the aW1 portion of a film winding device for a camera according to an embodiment of the present invention, FIGS. 2 and 3 are plan views of the same mechanism, and FIG. 4 is a plan view of the spool portion for winding the film. Figure 5 is a circuit diagram of the camera motor drive system, Figure 6, Figure 7, Figure 8, Figure 9, Figure 10, Figure 1.
Figures 1, 12, and 13 are flowcharts showing the control procedure in the same system, Figure 14 is a time chart, Figure 15 is a diagram showing changes in power supply voltage in the conventional device, and Figure 16 is a diagram showing the control procedure of the present invention. FIG. 3 is a diagram showing changes in power supply voltage in the device. 1, Ml...Motor, 22M2...Motor, 501
...CPU (control means), 502...Interface IC. Applicant Minolta Camera Co., Ltd. Agent
Patent Attorney Yasuo Itaya Figure Figure A 4a Figure Figure 10 Figure #40

Claims (1)

[Claims] (1) In a camera motor drive device equipped with multiple motors each responsible for charging each part of the camera and feeding film, the multiple motors are started to be driven almost simultaneously, and one of the motors is When the predetermined stop timing of the motor is reached, the motor is energized in the opposite direction to cause the motor to stop, and while the motor is energized in the opposite direction, the other motor is provided with a control means that cuts off the power supply. Features: Camera motor drive device.