JPH01257930A - Electrically driving device for camera - Google Patents

Abstract

PURPOSE:To facilitate countermeasure for the wide condition of a power source and that of load by switching the actuating timings of respective motors based on the results of detecting the rotating speeds of the respective motors. CONSTITUTION:At the time of detecting the actuating sections and the actuating time of the respective motors and also detecting that the actuating time is longer than a specified value, the parallel actuation of plural motors is inhibited and the actuation sequence is switched in order to respectively and sequentially actuate the motors. Namely, plural motors are simultaneously actuated in an energized power source voltage and all the motors are actuated in series when the condition of the power source is bad and each actuating time becomes abnormally slow. Thus, a driving current necessary for the actuation of the motor is lowered and the abnormal lowering of the power source voltage is prevented, so that the countermeasure for the wide condition of the power source and that of the load can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a camera drive device that uses a plurality of motors to wind up and rewind a film, and to drive and charge various parts of the camera.

[Conventional technology]

Conventionally, in a camera in which each part of the camera is driven, charged and film fed by a single motor, if the balance between loads and drive efficiency is unbalanced, the drive system must be designed to match the maximum load and minimum efficiency.

Therefore, when high-speed driving is required, a high driving voltage is required. As an improvement, a method has been adopted in which a plurality of motors are used to separately drive each part of the camera, charging, and film feeding by dedicated motors and transmission systems set to optimal reduction ratios.

When multiple motors are operated in parallel like this, there is no problem if the power supply voltage is sufficient, but if it drops or the ambient temperature drops and the internal resistance of the battery increases, multiple problems may occur. The power supply voltage becomes significantly lower than the drive current.

If the power supply voltage drops abnormally in this way, there is a possibility that the voltage will drop below the minimum guarantee voltage of the control means such as a microcomputer, and there is a possibility that the operation of the control means will become abnormal.

Furthermore, if the power check level is increased in order to avoid the above-mentioned trouble, the number of films to be fed will be extremely reduced, causing problems in practical use.

To address these shortcomings, multiple reduction ratios are installed in the hoisting transmission system, etc., and conditions such as power supply status and load status are detected by monitoring the operating time of each part. If so, reverse the motor rotation direction and
A method has been proposed in which the motor drive current value is reduced by switching to a different reduction ratio.

[Problem that the invention seeks to solve]

In this way, when a plurality of motors and transmission systems are provided and the reduction ratio of each transmission system is to be switched,
If abnormally low speeds are detected for each of the film winding motor and charge motor, and the reduction ratios of their respective transmission systems are automatically switched, it is possible to cope with a wide range of power supply and load conditions, but this method poses the following problems. It will be done.

1. Since different reduction ratios are provided for each transmission system, the number of space parts and costs increase.

2. An independent sensor is required to detect the speed of each motor, which increases space and cost.

The present invention was made in view of these conventional problems, and provides a camera that can handle a wide range of power and load conditions without increasing cost and space in a drive system that operates multiple motors in parallel. The purpose is to provide an electric drive device.

[Means for solving problems]

In order to achieve this object, the present invention employs the following configuration. That is, in a drive device that operates multiple motors in parallel during normal operation, when the operating time of each motor's operating section is detected and it is detected that the operating time has become slower than a predetermined value, Prohibits parallel operation of multiple motors and switches the operating sequence to operate each motor in sequence. This reduces the drive current required for motor operation, prevents abnormal drops in power supply voltage, and supports a wide range of power supply and load conditions. This is how it was done.

〔Example〕

1 to 3 show the basic configuration of an embodiment of the present invention. In this embodiment, a sequence drive motor (hereinafter referred to as S motor) Ms, a film drive motor (hereinafter referred to as F
Three motors are used: a motor (hereinafter referred to as a motor) Mf, and an automatic focus adjustment drive motor (hereinafter referred to as an AF motor) Mar, and FIG. 1 shows the drive timing of these motors.

Here, the functions of the camera in this embodiment will be described.

This camera is a fully automatic camera capable of automatic loading, automatic winding, and rewinding, and the frame speed is set to C by a selection member (not shown).
It is possible to select from three drive modes: M and CLSS.

CH mode: Rapid shooting mode of 3 frames or more per second CL mode:
Continuous shooting mode S mode that shoots about 2 frames per second; Single mode that operates only when the camera is released.

This camera also incorporates an automatic focus adjustment (hereinafter referred to as AF) function, which detects focus using a focus detection means (not shown) and adjusts the AF motor based on the result.
drives the lens distance ring.

The AF mode also has the following two modes.

AF-C mode: Release priority mode that activates the shutter when the release button is pressed even in an out-of-focus state.

AF-S mode: Focus priority mode in which the shutter is not activated even if the release button is pressed unless focus is achieved.

The drive timing of each motor is determined by the selection of the above functions.

FIG. 1 shows the drive timing of each motor in each drive mode when the AF mode is set to AF-C.

FIG. 1 (11 is the CM mode.

Focus detection is started by a half-press signal generated by pressing the release button halfway, and based on the result, the AF motor Mar drives the lens, and is stopped by a release signal generated by pressing the release button fully.

The S motor M3 drives the mirror and charges the shutter, starts driving in response to a release signal, and first raises the mirror. After the mirror is raised, the shutter is moved and the Z-Kensmoke is activated again to begin the mirror-down process.

The F motor Mf starts driving in synchronization with the restart of the S motor Ms to feed the film.

By operating the S motor Ms and the F motor Mf simultaneously in this way, the time required for the l sequence can be shortened.

The AF motor Mar in this CH mode operates only before the first release, and does not operate from the next frame onward, resulting in a so-called AF lock state.

Next, the CL mode is shown in FIG. 1 (2).

Since the CL mode is a continuous shooting mode of about 2 frames per second, the operating time per sequence is about 500 m5. As shown in the figure, the drive timing of the sequence is C. If the mode is the same, a delay time is required until the next release. In this embodiment, the delay time is about 200 m5, and that time is used as the focus driving time for the next distance measurement value. As described above, in the CL mode, focus detection is performed after the mirror is lowered, and AF driving is performed between sequences, thereby making it possible to perform continuous photographing while always performing a focusing operation on the subject. Next, the drive timing in the S mode is shown in FIG. 1 (3).

The drive timing of each motor is the same as in the 0M mode. Therefore, even though it is called a single-frame shooting mode, it is a mode that allows you to take quick pictures depending on how you release the camera.

The combinations of motor operation timings in each drive mode shown above are just one example, and various other combinations are possible.

An example is shown in FIG.

Note that since the C imode requires a combination with the shortest operation time of the l sequence, its recombination is not possible, so the sequence is the same as +11 in Figure 1.

In CL mode, S motor Ms, F motor M in the previous plan
Although f was operated in the same way as C and I, in the case of frozen desserts, it is operated in series, and the AF motor Mar is operated in parallel with both motors Ms and Mf. This combination is A
Since the F motor Maf has the smallest power, it has the advantage of increasing operating margin even when the power supply drops, even if it is operated in parallel with other motors.

Also, in the S mode, as in the CL mode, the S motor M
3 and F motor Mf are operated in series.

Next, the operating combinations of the motors in the 01 mode will be explained. FIG. 3 shows each drive mode in the 02 mode.

The C8 mode is a mode in which, as shown in the figure, in the CL mode, the section where two or more motors are driven in parallel is eliminated, and all motors are operated in series.

In the normal sequence, both C, CL modes operate two or more motors in i2 rows, but if the film winding load becomes heavy (or if the battery usage time elapses or the ambient temperature drops), If the power supply voltage drops, the power supply capacity may be exceeded and one of the motors may stop.

When two or more motors are operated in parallel in this way,
Depending on the power supply state, the number of films fed may become extremely small.

In preparation for such a case, the operating speed of the motor is divided into each operating section and monitored, and if the speed becomes slower than the preset speed (when there is no margin in the power supply capacity), the motor is switched to the C-mode. It's ready to go in.

Here, the determination procedure when entering the 08 mode will be explained with reference to the flowchart of FIG. Further, supplementary reference is made to FIGS. 7 and 8. FIG. 7 is a diagram showing the operation timing of each part in a series of sequences from automatic film feeding to automatic rewinding, and FIG. 8 includes C and mode.
CL, C'' mode sequences are shown.

In FIG. 4, the determination of the rotational speeds of S motors M3 and F-1-Mf is performed four times.

In the figure, the generation of the release signal (I in Figure 7 (4))
If there is a timing of J in αφ in FIG. 11 is started. When these operations are completed, the charge switch is turned on (timing of N in Figure 7 (8))
As a result, the S motor Ms is stopped. In step S3, a shirt release is performed.

After that, the process moves to step S4, and the rotational speed of the S motor Ms is determined. Here, the S-moke Ms is performed between the generation of the release signal in step Sl (timing ◯ in Fig. 7 (4)) and the turning on of the charge switch (timing N in Fig. 7 (8)). Driving time (Fig. 7 α
The time [(a)] is monitored, and it is determined whether the operating time during this period exceeds 75+s.

If a positive result is obtained in step S4, it is assumed that the power supply voltage has decreased, and the mode is switched to C2 mode. In step S5, the S motor Ms is first started to perform mirror-down shutter charging, and in step S6, charging is performed. When this is completed, the S motor Ms is stopped, and then in step S7 the F motor Mr is started to start film winding, and when the film winding is completed in step S8, the F motor M is started.
Stop r. This operation sequence is shown in Figure 8 (9).
, (4) is shown in the 02 mode section.

If a negative result is obtained in step S4, it is assumed that the power supply voltage is sufficient, and the mirror down operation by the S motor Ms is performed.
The shifter charge and the upper film by the F motor Mr are started in parallel, and the process moves to step 310.

In steps 310-312, the rotation speed of F motor Mr (7) is detected. This detects the film winding speed by the F motor Mr using an encoder pulse for detecting the perforation position linked to the sprocket shaft, thereby making the determinations of the second to fourth steps.

In step SIO, the operating time of the F motor Mr from the start of film feeding until obtaining 15 pulses (see Fig. 7 (7)
It is detected whether the time (b)) exceeds 65m5t.

In step Sll, it is detected whether the operating time of the F motor Mr (time (c) in FIG. 7 (7)) until obtaining 15 pulses from 16 pulses to 30 pulses exceeds 55-3. There is.

In step 312, the operating time of the F motor Mr is 1 until obtaining 20 pulses from 74 pulses to 94 pulses.
It is detected whether or not it exceeds 25m5.

The rotational speed serving as a criterion becomes slower in the order of step Sll and step 5IOSS12. The reason why the determination reference speed in step 310 is slower than step Sll is because the starting torque at the beginning of film winding is large.
This is because the rotational speed of the motor Mr becomes relatively slow. F
The reason why the determination reference speed in step S12 at the stage where the rotation of the motor Mr has progressed is made the slowest is as follows. In other words, when the power supply battery is exhausted, a voltage drop occurs as the F motor Mr rotates, and the rotation speed of the F motor Mr slows down, but at this stage, the film winding can be completed without interruption. This is because the processing becomes simpler.

If a negative result is obtained in each of the above steps 310 to 312, in step S8, shutter charging is completed and S
Motor Ms and F motor Mr are respectively stopped upon completion of film winding.

When a positive result is obtained in each step 310 to 312, the operation of the F motor Mr is immediately interrupted in step S13,
Only the S motor Ms continues to operate.

After that, when it is detected that the mirror down/shutter charge is completed, the F motor Mr is restarted in step S15, the film remaining due to the interruption is wound, and the film is wound in step S15.
8, upon completion of film winding, the F motor M is stopped.

Judgments for each step described above are made at each release (during operation), but since the conditions for returning to normal operation are stricter than the conditions for entering 08 mode, once set to Ct mode, It is not possible to return to normal mode unless the power supply is replaced or the ambient temperature rises sufficiently.

The configuration of the above-described embodiment is shown in FIGS. 5 and 6.

FIG. 5 schematically shows the arrangement of each motor when the camera is viewed from the front.

The S motor Ms is disposed within the hoisting spool. The sequence system mechanism that is driven by the S motor Ms and drives the mirror, aperture, and charges the shutter is assembled into parts at the lower part of the winding side and the side of the mirror box, and the output shaft of the motor is on the upper side and rotates only once. It is the direction.

The F-moke Mf is disposed between the spool chamber and the mirror box, and winds the film by forward rotation and rewinds it by reverse rotation. Switching between the winding transmission system and the rewinding transmission system uses a planetary gear clutch that rotates in forward and reverse rotation.

The AF motor Mar is installed at the bottom of the mirror box on the rewinding side, and its rotation is transmitted to the lens side via a comp ring installed at the bottom of the rewinding side of the bayonet, and the 0-order motor performs focusing drive. Details of the drive mechanism in this embodiment will be explained using FIG. 6.

FIG. 6 is a perspective view of the drive section of this embodiment, showing the state before release.

1. First, the operation of the sequence system in this embodiment will be explained.

The operation of the S motor Ms is divided into two sections: a mirror-up/aperture drive section and a mirror-down/shutter charge section. In the first section (mirror up, aperture drive), the charge cam 2 integrally formed with the charge cam gear l rotates from 0° to 85°, and in the second section (mirror down, shutter 7 charge), the charge cam 2 rotates from 0° to 85°. It is configured to rotate 275° and return to the reference position. In this way, one sequence is completed with one revolution of the charge cam. Here, the operation of the charge cam section will be described.

FIG. 6 shows the state before release, in which the locking lever 3 is rotated to the left by the release lever 4 and retracted from the charge cam groove, and the charge cam 2 is in a rotatable state. At this time, the charge switch 5Wah is OFF.

The S motor M is activated by the release signal when the shirt button is fully pressed.
s starts, and the charge cam 2 starts turning left in the first section (mirror up).

A cam portion 2a is provided at the upper end of the charge cam 2, and the rotation of the charge cam 2 causes the release lever 4 to rotate to the right and engage the locking pawl 5.

As the release lever 4 rotates to the right, the locking lever 3, which can now turn to the right, falls into the first section locking groove 2b provided at the upper end of the charge cam and functions as a stopper, and the charge switch 5Wch is interlocked. By turning on the
The driving of the S motor Ms is stopped.

The locking lever is released by energizing the solenoid S. By energizing the solenoid, the locking claw 5
rotates to the left and releases the lock of the release lever 4. The release lever is rotated to the left by the spring 6, but since the spring is set stronger than the switch 5Wch that biases the locking lever 3,
It rotates together with the lock lever 3 to release the lock of the charge cam 2.

Next, the S motor Ms detects the completion of the rear curtain travel of the shutter and starts the operation in the second section (mirror down, shutter charge). In this section, as in the first section, the release lever 4 is centered on the locking pawl 5 by the cam portion 2e provided at the upper end of the charge cam. The locking lever has 2 charge cams.
At the reference position rotated by 75 degrees, the charge cam falls into the groove 2c provided at the upper end of the charge cam, and the charge cam is stopped in the same manner as in the first section.

By turning on the charge switch 5Wch, the motor is stopped, and then a short brake is applied for a certain period of time, and then the solenoid S is energized to move the locking lever 3 to the charge cam groove 2.
Cancel from c.

The timing for releasing the locking lever 3 is performed when the operation of the S motor Ms is completed, and the charge cam is always in a standby state for the next operation.

Next, the first section, mirror-up and aperture drive operations, will be described. When the shutter button is fully pressed and a release signal is generated, the S motor Ms starts rotating to the right. The rotation is transmitted to the charge cam gear 1 via the reduction gear system 11-14, causing the charge cam 2 to rotate counterclockwise.

A mirror drive pin 15 is fixed to the lower end of the charge cam gear 1, and comes into contact with a mirror drive lever 16 to rotate the lever to the right.

One end of the lever 16 has a sequence group 1Ii (not shown).
The other end is engaged with a mirror driving vertical lever 21 provided on the mirror box forming board, and the lever 21 is rotated as the charge cam 2 rotates. Rotate it to the right.

On the mirror box forming board (not shown), there are a mirror drive vertical lever 21, an aperture return lever 22, and an aperture lever 23.
are coaxially supported at three points, each with a spring 24.
25 in the counterclockwise direction and abuts against the initial position setting pin 26.

Reference numeral 27 denotes a movable mirror, which is disposed in the initial position (before release) in front of the film surface and inclined at 45 degrees with respect to the photographing optical path. The movable mirror is rotatably supported by a rotating shaft 28, and biased in the clockwise rotation direction by a mirror down spring.

A mirror drive pin 30 is implanted on the side surface of the mirror, and projects into the operating locus of a lever 29 disposed at one end of the mirror drive vertical lever 21.

Along with the operation of the first section described above, the mirror drive vertical lever 2
1 turns to the right, the mirror drive pin 30 is pushed up, and the movable mirror 27 rises.

On the other hand, the aperture return lever 22 and the aperture lever 23 are also rotated to the right together with the mirror drive vertical lever.
An aperture drive spring 31 is hung between the aperture lever 23 and the aperture lever 23, and the aperture lever 23 also rotates to the right via the spring.

An aperture lever of a lens (not shown) is in contact with one end 23a of the aperture lever 23, and the aperture in the lens is gradually narrowed down as the lever rotates to the right.

Further, the gear section provided at the other end 23b of the aperture lever 23 is meshed with a ratchet gear 33 for aperture control and an encoder section 34 (for aperture control) via a speed increasing gear 32, so that Throttle control is performed to lock the ratchet gear in response to the encoder output.

The diaphragm control locking pawl 35 is held by a permanent magnet by setting it on an attraction surface. The attraction is released by energizing the electromagnet according to the number of pulses for the set aperture,
The locking pawl 35 rotates to the left and locks the ratchet gear 33, thereby locking the aperture lever at the set position. A cam portion 21a is provided at one end of the mirror drive vertical lever 21, and a roller 37 disposed at the tip of the shirt release lever 36 comes into contact with the cam portion 21a.

The shutter release lever 36 is rotated to the left by the cam 21a in conjunction with the mirror amplifier, and releases the shutter-side mechanical locking lever 38 engaged at the tip of the lever.

Both the leading and trailing shutters of the shutter are held in place by electromagnets, and an electromagnetic control shack is employed that forms a slit by sequentially cutting off the power to the blue electromagnets.

The blue electromagnet is energized in synchronization with the release signal, and in the charging completion state at the end of the sequence, the attracting position state is maintained by mechanical locking.

The running timing of the leading curtain is 13-13-1, starting from the ON of the charge switch 5Wch at the end of the first section operation of the charge cam.
It is set to start 3 times later.

Next is the second section. The operation of mirror down and shutter charge will be explained.

When the shutter curtain completes running according to the set time, the trailing curtain SW is turned on in conjunction with the trailing curtain.

By detecting this trailing curtain signal, the film feeding motor M2 starts to be driven. After this number of Ims, the resilienoid is energized and the charge cam 2 is unlocked. By detecting the reversal (ON→0FF) of the charge switch 5Wch at that time, the Z-KEN smoke starts to rotate in the same direction as the first section.

The mirror drive lever 16 rotates as the charge cam 2 rotates.
The mirror drive vertical lever 21 is rotated to the left by the return spring 25, and the movable mirror 27 also descends.

On the other hand, the cam portion 2d of the charge cam 2 is in contact with a bearing 42 that is fixedly provided on the lever 41 by a shafter. The shutter charge lever 41 is rotatably supported by an upper base plate (not shown) 41a, and the shutter-side charge lever engages with a roller disposed at its tip.

As the charge cam rotates to the left in the second section, the lever 41 is rotated to the right to rotate the shutter-side charge lever to the right to center the shutter drive spring.

Further, one end 41b of the shutter charge lever 41 is engaged with the reset connection lever 43, and as the shutter charge lever 41 rotates to the right, the lever is rotated to the right. A reset spring 45 is disposed between the reset connection lever 43 and the reset lever 44 to act as an internal force, and this urging force pushes down the throttle Mg locking lever 35 that is in the locked state, and the Mg adsorption surface is being reset to.

As a result, the aperture lever 23 is unlocked and the return spring 2
4, the diaphragm inside the lens is rotated to the left and returned to the open position.

The charge cam 2 moves through this second section of 275 degrees, completes mirror down and shutter charging, returns to the reference position, and completes one sequence.

2. Next, the film feeding system will be described.

In this embodiment, a spool drive method is used for winding the film by hooking the perforations of the film onto claws 51a provided on the outer periphery of the spool 51.

The film feed motor M2 is attached to a speed reduction board (not shown) attached to the camera body, and is disposed in front of the shutter.

A pinion gear 52 is fixed to the output shaft of the motor, and rotation is transmitted to the spool 51 via reduction gears 53 to 55.

A planetary gear 56 is disposed in the middle of the transmission gear, and transmits rotation to the spool side as the motor rotates to the right, and transmits rotation to the rewind side as the motor rotates to the left.

57 is a four-tooth sprocket, which functions as a follower to detect the amount of movement of the film perforations.

A gear 57a is provided at the bottom of the sprocket and transmits its rotation to an encoder 59 via a reference gear 58. The reference gear 58 is a gear that rotates once per one rotation, and a reference switch SWk that outputs one pulse per rotation is disposed on the outer periphery of the gear.

The encoder 59 has a resolution of generating 114 pulses for one frame, and its position is controlled so that it stops at a constant encoder pulse from the output of the reference switch SWk.

The film feeding speed fluctuates greatly due to factors such as high-speed and low-speed winding, fluctuations in power supply voltage, and changes in ambient temperature.
It is very difficult to always stop the film at a constant feed rate.

In response to such fluctuations, in this embodiment, the film feed speed is monitored, and the brake control immediately before stopping is performed in accordance with a table prepared in advance, thereby controlling the overshoot amount to a constant amount with respect to the target stopping position. .

The position control will be explained in detail.

The reference switch SWk is a switch that is turned OFF when the film is fed by Ikoma (18 dragons), and functions as a feed reference SW for setting the interval between one shadow screen between perforations.

The amount of film feed is controlled by braking so as to stop the film by counting 57 encoder pulses (for Ikoma) from the reference switch SWk.

In this braking control, the duty driving range is tabulated according to the film feeding speed, and the faster the speed, the longer range braking is applied, and the slower the speed, the shorter range braking is applied.

The film feed speed monitor for this purpose is the standard switch SW.
The duty drive range is 0.4, 12, and 20 pulses from the stop position. It is divided into four stages.

In this embodiment, the output point of the reference SW is set at the center of the film feed amount, but this is an arbitrary value.

Furthermore, in this embodiment, the speed monitor point has a large difference from the final speed at the beginning of film winding.
In addition, when approaching the stopping point, a sufficient monitoring range cannot be obtained and it becomes susceptible to instantaneous changes, so a point of approximately 273 points was selected, but this is also an arbitrary value.

Next, the operation timings on the time chart will be explained. FIG. 7 shows the operation timings of each switch and each actuator for film feed, one frame in C mode, the last frame, and rewind.

1>Film advance (Fig. 7, section F) By setting the film, closing the back cover, and releasing the camera, the film is rapidly advanced for three frames.

When the distance between the back covers is detected by the back cover switch SWb that detects the open/closed state of the back cover 70 shown in FIG. 6, the shooting mode is automatically set to manual and the shutter speed is set to 1/250 seconds.

When the back cover is closed, the film is released and starts empty feeding, but at the beginning, the film feeding motor is pulse-driven. The pulse drive pattern repeats energization and pause several times at 5ms intervals at the start of drive, and then increases the duty ratio while the spool claw is applied to the perforation, gradually increasing the motor drive speed (G section). ).

The idle feed amount is performed by counting the reference switch SWk for three frames (H section), and the stop control is performed in the same way as for normal frames.

<2> Operation timing at 08:00 By releasing the shutter S opening, the release SW is closed (1 part), and energization to the S motor Ms is started (3
Department).

The release signal energizes the shutter front and rear curtains Mg (section K), and each curtain is brought into a holding state.

As the S motor M3 operates, the mirror is raised and the aperture is driven, and a pulse output is generated from the aperture encoder (
The aperture control is performed by counting the pulses and energizing the aperture control electromagnet before the number of pulses corresponding to the set aperture value is lost.The aperture control electromagnet is then stopped at the target aperture value (M part). Regarding the energization timing of the aperture control electromagnet Mg, there is a table showing how many pulses before the target aperture value the stop signal should be issued.
Selected based on narrowing down speed.

The narrowing down speed is constantly monitored by the output time between each pulse.

The S motor Ms stops when the charge switch 5Wch is turned ON (N part).The charge switch 5Wch is also the starting point switch for the shutter curtain run, and after a delay of 13m5 is applied from the charge switch 5Wch ON, the front curtain starts moving. The vehicle starts running (part 0), after the set time (8 parts), the trailing curtain also runs, and the trailing curtain switch SW is reversed (OFF-4ON) (part 2), and this trailing curtain switch SW is detected. As a result, F motor Mf starts operating. After this 3ars, the solenoid is energized (0 part), the charge cam locking lever is released, and the S motor Ms becomes able to rotate. Charge switch 5Wch is also inverted (ON-OFF) at the same time (
R part), it is detected and Z-Kensmoke begins to operate.

When the mirror down and shutter charging are completed, the charge switch 5Wch is set to 0NL (T section) again, the motor is stopped, the brake is applied for a certain period of time, and the charge cam is stopped. When the brake is released & (portion L), the solenoid is energized (portion K), the charge cam locking lever is released, and the state is set to wait for the next release signal.

Meanwhile, the film feed motor also operates in parallel, winding the film around the spool.

The pulse generated by the rotation of the follower sprocket (W part) is the OFF point of the reference switch SWk (X part)
1 while counting a certain amount and performing the previous braking control.
Finish feeding the pieces.

The film feed speed monitoring interval required for the braking control is as follows:
Using the 20 pulses 20 to 40 pulses before the target stop point ((d) in Figure 7 (6)), the duty drive (braking drive) range is determined according to the speed as shown in Figure 7 (6).
I am choosing from (e), (e), and (g).

Since the film winding time varies depending on the number of frames, it is desirable that the sequence end timing be determined by the sequence system.

(3> Final Frame Determination Film Feeding The feeding motor is stopped when it is detected that no spontaneous encoder pulses are generated for a certain period of time.

The S motor Ms continues to operate and stops in the same way as in the normal sequence.

4> Film rewinding Close the rewind SW using a separate operating member to start rewinding. (Y) Film rewinding is completed by continuing rewinding for several 5 ecJJ after detecting the reversal of the film detection switch S W r, which serves as a film presence/absence signal. After that, the motor is several tens of ffis
The gear is rotated in the normal direction and the planetary gears are switched (Z), completing one operation.

Figure 8 shows each switch in CL mode and C2 mode,
The operation timing of each actuator is shown.

<1> CL mode Each operation timing is basically the same as the CM mode, so the explanation will be omitted.

Since the CL mode is about 2 frames per second, there is a delay time 4 until the next release, and the AF motor is operated during this time.

The starting point for photometry and focus detection must be performed after the movable mirror has completely stopped.In cameras where the mirror is driven by a motor, the mirror down time varies greatly depending on fluctuations in the motor drive voltage, so photometry is ,
When setting the focus detection start point at a constant value, you must allow for the longest time at the lowest drive voltage. The maximum piece speed may be determined by

Therefore, as a method for obtaining the shortest focus detection and photometry start timing at each voltage, a value ((a) in αl in FIG. 8) is set by adding a constant time to the first section operating time of the S motor Ms.

<2> C! The motors that were operating in parallel in mode C and CL mode are now operating in series. The individual operation details of each motor are the same as those in the CH mode described above, so a description thereof will be omitted here.

〔Effect of the invention〕

As explained above, according to the present invention, when a plurality of motors are operated in parallel at the energized power supply voltage, and the power supply condition is poor and each operation time becomes abnormally slow, all the motors are connected in series. By activating it, it is possible to minimize the drop in power supply voltage.

Since this type of switching is performed electrically, there are fewer parts compared to mechanically switching the reduction ratio.
Since a simple mechanism is required, not only is it possible to reduce costs, but also the camera itself can be made smaller because storage space for the mechanism is no longer required.

FIG. 9 is a block diagram of an embodiment of the present invention.

MCUloo is a microcomputer that executes predetermined routines in response to various inputs and produces various outputs.
It realizes various functions.

101 is a photometric circuit for AE, 102 is a photometric circuit for AF, and 103 is an information setting circuit. Respectively, MCU
connected to loo's boats Pi, P2, and P3, and connected to MCU
loo receives and receives various information.

104 is a display circuit. MCUloo outputs from port P4 the AF display information output calculated based on the output of the AE photometry circuit and the AE display information output calculated based on the output of the AF photometry circuit 102 and the information setting circuit 103. A predetermined display is performed.

105 is an aperture control circuit. When the exposure control mode is program mode or shutter priority mode, the lens aperture is narrowed down after the release and the rotation of the lens 34 is received by the aperture control n photo ink converter, and the aperture control photo ink converter output is waveform-shaped. The aperture encoder pulse is transmitted to the MCU 100 via R5. MCU
loo measures the number of generated pulses, and when it reaches a predetermined number, it energizes the aperture control magnet via the boat P5 to lock the lens aperture at an aperture value that provides proper exposure.

106 is a shafter control circuit. MCUlooo controls via R6, l cMg and 2 after release
The cMg is energized to lock the shutter curtain, and after mirror amplification is completed, the cMg is de-energized to start running the leading curtain, and after a predetermined shafter control time, the cMg is de-energized and the rear curtain is activated. The shutter speed is controlled to a predetermined shutter speed.

Switch SWO is a release switch, and MCUlo
It is connected to the input terminal 10 of o. Press the second release button
It turns ON by pushing it to the stroke. The switch SWr is a rewind switch, and is connected to the input terminal 1 of the MCU 100. Switch SW2 is a back cover switch and is connected to input terminal 2 of MCUloo.

The switch SWF is a film presence/absence switch, and the MCU
Connected to input terminal ■3 of 100.

Reference numeral 107 denotes an AF motor drive circuit, which is connected to the boat P7 and drives the AF drive motor based on the result calculated by the MCU 100 based on the output of the AF photometry circuit 102.

108 is a sequence motor drive circuit, MCUlo
o's baud) connected to R8. After the release, the MCUIoo outputs to the boat P8, drives the Z-Kensmoke M1, starts the release sequence, performs mirror up operation, mirror down operation, and shutter charging operation. Switch 5Wch is a charge switch,
Connected to input terminal I4 of MCUloo. Solenoid S is connected to boat P9 of MCU 100. 110
is a film feed motor drive circuit, which is connected to the boat PTO of MCUIoo. After completing the shutter control, MCUloo is output to R9 and the film feeding motor M2 is output.
The switch SWK is a reference switch, and when the rewind switch SWr is pressed, it rewinds all frames.
Connected to input terminal I5 of U 100. 109 is a photo ink converter for film feeding, and a diode D1
and phototransistor Tri, and 59 rotates in the groove between them. The anode side of the diode D1 and the collector of the phototransistor Tri are connected to a power supply line (not shown), the cathode side of the diode DI is connected to the boat P12 of the MCU 100 via a resistor R1, and the emitter of the phototransistor Tri is connected to a resistor R2. The other end of the resistor R2 is grounded. After controlling the shutter or charging the shutter, when the MCU 100 turns the boat PL2 to L at the same time as it rotates the film feed motor M2 in the forward direction, a current flows through the diode DI.
Diode D1 emits light. Due to the rotation of 59, the light from the diode DI is either blocked or passed by the hole 59, and the intensity of the light incident on the base of the phototransistor Tri is changed. Therefore, the waveform shaping circuit 111
At the point where R2 is connected to resistor R2, a voltage change occurs corresponding to the intensity of light. The waveform shaping circuit 111 shapes the waveform so that the pulses corresponding to the film feeding amount are adjusted to the boat pH.
is input to MCU 100 via.

The MCUloo measures the number of pulses input to the boat 11 at a predetermined timing and controls the film feeding motor drive circuit 11.
By driving 0, film feeding control n as described in FIGS. 7 and 8 becomes possible. Therefore,
59, photo ink converter 109, waveform shaping circuit 11,
The resistors R1 and R2 constitute film feeding amount detection means.

[Brief explanation of the drawing]

FIG. 1 shows the drive timing of the motor in each drive mode in this embodiment. FIG. 2 shows alternatives for motor drive timing in each drive mode. FIG. 3 shows the drive timing of the motor in each drive mode in the C2 mode. FIG. 4 shows a determination flowchart for switching to C2 mode. FIG. 5 shows the arrangement of the motors in this embodiment. FIG. 6 shows a perspective view of the drive mechanism in this embodiment. FIG. 7 and FIG. 8 show drive time charts in this embodiment. FIG. 9 shows a circuit block diagram of this embodiment. [Explanation of symbols of main parts] Ms......Jiken smoke Mf...Film feeding motor

Claims (1)

[Claims] In a camera equipped with a film feeding motor for winding and rewinding the film, and a sequence motor for driving various parts of the camera, there is provided a detection means for detecting the rotational speed of at least one of the respective motors; 1. An electric drive device for a camera, comprising: a control means for switching the operation timing of each motor according to a detection result.