JPH03219222A - Winding device for camera - Google Patents

Abstract

PURPOSE:To enable slow-speed winding without using pulse driving by selecting the slow-speed winding mode of the winding device which is driven by plural motors and driving the device by a small number of motors at a high speed reduction ratio. CONSTITUTION:The gear ratio is changed to a high gear ratio for the slow- speed winding and when motors 1 and 8 are in a proper loading state, a small number of motors 1 and 8 charge a shutter and a mirror 5 at a high speed reduction ratio and wind a film at the slow rotational speed of a spool 13. The operation noise is therefore reduced. Further, the pulse driving is not performed at the time of the slow-speed winding to evade the repetitive consump tion of the electromotive force and stationary driving in a torque range where the driving efficiency of the motors 1 and 8 is excellent is performed. Conse quently, the electric power is not wasted and the stop of operation due to an abnormal drop in the source voltage can be eliminated.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a camera winding device.

B. PRIOR TECHNOLOGY A device is known in which the winding of a conventional camera, that is, the charging of the shutter, the mirror drive mechanism, etc., and the winding of the film are performed by electric drive using a motor as the power source. This type of camera can be electrically hoisted quickly, but the reduction gear made up of gears and the like makes a lot of noise when it operates. Therefore, in order to reduce the operating noise as much as possible, efforts have been made to wind the machine at a low speed.

Low speed winding is effective for smooth shutter charging at low temperatures and for preventing film breakage.

As a method for low-speed winding, pulse driving is used in which the motor is turned on and off in short periods of time.

C1 Problems to be Solved by the Invention However, when the above-mentioned pulse drive is performed, the motor starting current or a large current close to it frequently flows repeatedly at short intervals, resulting in the following problems.

That is, cameras often use batteries as a power source, but when a large current flows, the power source voltage drops. Particularly when the battery is exhausted or used at low temperatures, the internal resistance of the battery increases and the voltage drop also increases, resulting in a significant drop in the terminal voltage of the power supply. Electronic circuits are equipped with a constant voltage circuit to maintain the operation of the CPU, etc., but if the terminal voltage falls below the required human power voltage of the constant voltage circuit, the circuit will stop operating, and the camera will therefore become inoperable. .

For these reasons, if pulse drive is used frequently, the probability that the camera will stop operating increases, even though the battery would still be usable in normal operation without pulse drive.

For a motor, it is not preferable to repeatedly flow a large current because it accelerates the deterioration of the commutator.

In addition, in pulse drive, the torque used reciprocates between the starting torque and the load torque many times, but this overhead is in a low efficiency range and a large amount of power is consumed for hoisting.

The present invention has been made in view of such conventional problems, and an object of the present invention is to enable low-speed winding without using pulse drive.

00 Means for Solving the Problems In order to solve the above-mentioned problems, the present invention selects a low-speed winding mode in a winding device that is normally configured to be driven by a plurality of motors, and uses a small number of motors at a large reduction ratio. The film winding device of the camera was configured as follows so that it could be driven. That is, an exposure mechanism including a shutter or a mirror, a film winding mechanism, and a first mechanism installed to charge the exposure mechanism.
motor, and a second motor installed to drive the film winding mechanism.
a first power transmission means for transmitting the driving force of the first motor to the exposure mechanism; and a second power transmission means for transmitting the driving force of the second motor to the film winding mechanism. In a camera winding device, the reduction ratio is larger than that of the first and second power transmission means, and one motor of the first and second motors is used for both the exposure mechanism and the film winding mechanism. a third power transmission means for transmitting force; and a third power transmission means for transmitting the driving force of the first motor to the exposure mechanism via the first power transmission means, and a second power transmission means for transmitting the driving force of the second motor. a first state in which the driving force of one of the first and second motors is transmitted to the exposure mechanism and the film winding mechanism through a third power transmission means; The camera winding device is configured to have a switching means that can be switched to select one of the second states to be transmitted to both of the two states.

E0 action When winding at low speed, change to a large gear ratio, and when the load torque of a motor of an appropriate size is applied, a small number of motors with a large reduction ratio charge the shutter, mirror, etc., and film at a slow rotational speed of the spool. Perform winding.

When performing low-speed winding, pulse drive is not performed, and repeated flow of starting current is avoided, resulting in steady drive in a torque range where the motor has good drive efficiency.

When winding at low speed, the rotational speed of the spool is low, and therefore the force that pulls the film on the spool is low.

For high-speed winding, multiple motors are used to quickly and efficiently drive the shutter, mirror, etc. and wind the film at a small reduction ratio.

F. Example An embodiment of the present invention will be explained with reference to FIG.

FIG. 3 is an exploded perspective view showing the winding mechanism of the camera according to the embodiment of the present invention.

A gear (2) is fixed to one end of the shaft (1a) of the first motor (1). The gear (2) meshes with a gear (3) fixed to one end of the shaft (3a). The shaft (3a) engages with the charging mechanism (4).

The charging mechanism section (4) is a mechanism that includes a deceleration mechanism consisting of a cam, etc., and charges the shutter (not shown) and the mirror (5).
This is a well-known device that drives the lens diaphragm (not shown) and the lens diaphragm (not shown).

The switch (6) detects the position of the mirror (5). A pin (7) provided on the side of the mirror (5) when the mirror (5) is in the lowered position, that is, the object observation position.
The mirror is placed in such a position that it makes contact with the mirror and issues a mirror lowering completion signal.

A shaft (8a) protruding above the second motor (8) is installed coaxially with the shaft (9a) via a one-way clutch (9). The one-way clutch (9) is configured such that when the second motor (8) rotates normally, the rotation of the shaft (8a) is transmitted to the shaft (9a).

A gear (10) is fixed to one end of the shaft (9a).

The gear (10) meshes with a gear (11) fixedly attached to one end of the shaft (lla). The shaft (11a) is engaged with a film winding mechanism (12).

The film winding mechanism section (12) is a mechanism including a speed reduction mechanism, and is a known device that rotates and drives the spool (13).

A gear (14) is fixed to one end of the shaft (8b) protruding below the second motor (8). The gear (14) meshes with a gear (18) fixed to the lower end of the shaft (17) via gears (15) and (16). Gear (14), (1
5), (16), and (18) form a reduction gear train.

The shaft (17) is connected to the shaft (20) via the one-way clutch (19).
It is coaxial with The shaft (20) is a one-way clutch (19),
Clutch member (27), gear (26), clutch member (
A 22L gear (21) is arranged coaxially.

A gear (18) is fixed to one end of the shaft (17), and a lower member of a one-way clutch (19) is fixed to the other end. When the second motor (8) reverses, the one-way clutch (19)
The rotation of the shaft (8b) is caused by the gears (14), (15), (16)
, (1B) are adapted to be transmitted to the shaft (20) via the shaft (17).

The upper member of the one-way launch (19) is fixed to one end of the shaft (20). The pin (28) is fixed to the shaft (20).

The clutch member (27) is pivotally supported by the shaft (20), its slide groove (27a) guides the pin (28), is movable in the axial direction, and is integrally engaged with the shaft (20) regarding rotation. It matches.

The groove (27b) of the clutch member (27) is connected to the lever (29).
) is movably guided and engaged with the pin (29a).

The gear (26) is rotatably supported by the shaft (20), and its lower part becomes a concave tooth and engages with the convex tooth on the upper part of the clutch member (27), or is in an unengaged state. be.

Gear (26) meshes with gear (3).

The pin (23) is fixed to the shaft (20).

The clutch member (22) is pivotally supported by the shaft (20), and its slide groove (22a) guides the pin (23), is movable in the axial direction, and is integrally engaged with the shaft (20) for rotation. are doing.

The groove (22b) of the clutch member (22) is connected to the lever (24).
) is movably engaged with the pin (24a).

The gear (21) is rotatably supported by the shaft (20), and the lower part of the gear has concave teeth that are engaged with the convex teeth of the upper part of the clutch member (22) or are in a disengaged state. be.

Gear (21) meshes with gear (11).

One end of the lever (24) is rotatably installed on the camera body (not shown) and is biased upward in the figure. When operated, the solenoid (25) engages the lever (24) to rotate it downward.

When the lever (24) goes up, the clutch member (22)
When the lever (24) is lowered, the clutch member (22) is interlocked and moved up to take the engaged position with respect to the gear (21), or when the lever (24) is lowered, the clutch member (22) is interlocked and brought into a non-engaged position with respect to the gear (21). It is designed to take the position of

One end of the lever (29) is rotatably installed on the camera body (not shown), and is biased downward in the figure. When operated, the solenoid (30) engages the lever (29) to rotate it upward.

When the lever (29) goes up, the clutch member (27)
When the lever (29) is lowered, the clutch member (27) is interlocked and moved up to take the engaged position with respect to the gear (26), or when the lever (29) is lowered, the clutch member (27) is interlocked and moved down to the non-engaged position with respect to the gear (26). It is designed to take the position of

The sprocket (31) is rotatably supported by a camera body (not shown). Teeth (13a) of spool (13)
) and the teeth (31a) of the sprocket (31) are engaged with each other so as to rotate in conjunction with each other via perforations (not shown) in the film.

The lower end of the sprocket (31) has a radial conductor pattern (3
An encoder board (32) provided with 2a) is fixed. A brush (33) is fixed to the camera body (not shown) and is in contact with the encoder board (32), so that when the sprocket (31) rotates, it generates an on/off pulse signal.

Next, the winding mode selection means will be explained.

The seventh figure is an overhead view of the top of the camera.

An annular winding mode selection dial (36) is installed on the front right side of the top surface of the camera (35). A release button (39) for releasing the camera is installed in the center of the winding mode selection dial (36). On the top of the winding mode selection dial (36) is a number mark (37) rl.
"2" is attached. There is also an indicator (38) on the top of the camera (35) near the winding mode selection dial (36).
is provided, and the number mark (37) is the indicator (38).
The winding mode is selected by making it correspond to the above.

The operation of the embodiment configured as above will be explained below.

First, one of the first winding mode in which the winding operation is performed at high speed and the second winding mode in which the winding operation is performed at low speed is selected.

The number mark (37) on the winding mode selection dial (36)
)N, , + to the index (38) to enter the first winding mode.

The operation in the first mode will be explained with reference to FIG.

FIG. 3 shows the state in the high speed first winding mode.

When the release button (39) is pressed, the release operation starts and the mirror is raised, the aperture is stopped down, and the shutter is operated. When the exposure is completed, the first motor (1) is activated, and after a predetermined time period determined by a timer has elapsed, the second motor (8) is activated.

The rotation of the first motor (1) is transmitted to the charging mechanism section (4) via gears (2) and (3). Charging mechanism (
4) is driven to lower the mirror, open the aperture, and charge the shutter. When charging of all exposure mechanisms (not shown) is completed, the first motor (1) stops.

On the other hand, the rotation of the second motor (8) is transmitted from the upper shaft (8a) to the film winding mechanism (12) via the one-way clutch (9), gears (10), and (11). The film winding mechanism (12) is driven, the spool (13) rotates, and the film is wound.

At this time, the gear (21) meshes with the gear (11) and rotates.

The shaft (20) rotates via a clutch member (22) that meshes with the gear (21). However, the clutch member (27
) has fallen down and is not engaged with the gear (26), so the rotation of the second motor (8) is not transmitted to the gear (3), and the gear (26) is driven by the gear (3). and idle.

The rotation of the second motor (8) is also transmitted from the lower shaft (8b) to the shaft (17) via gears (14), (15), (16), and (18). Although the shaft (17) and shaft (20) rotate in opposite directions, they do not transmit rotation to each other due to the operation of the one-way clutch (19).

When the film is wound up by the rotation of the spool (13), the sprocket (31) rotates and on/off pulses are generated from the brush (33).

When the number of pulses corresponding to one frame of film winding is counted, the second motor (8) stops. This completes the winding operation.

Next, the number mark on the winding mode selection dial (36) (
37) Switch '2J to the index (38) to enter the second winding mode.

The operation in the low speed second mode will be explained with reference to FIG.

The operation from the release operation to the completion of exposure is the same as in the first mode. However, only the first motor (1) is activated by the exposure completion signal, and the second motor (8) is not activated.

When the mirror lowering is completed, the switch (6) comes into contact with the pin (7), and the first motor (1) is braked and stopped.

When the required stopping time has elapsed, the first motor (1) stops and both terminals thereof are opened.

The solenoid (30) is then energized. Solenoid (3
0) pushes up the lever (29) against the urging force, and the pin (29a) is also pushed up accordingly.
), the clutch member (27) is raised upwards, and the gear (
26).

Next, a voltage is applied to the second motor (8) in the opposite manner to that in the first mode. The rotation of the upper shaft (8a) of the motor (8) is not transmitted to the gear (10) due to the action of the one-way clutch (9). The rotation of the lower shaft (8b) of the motor (8) is controlled by a one-way clutch (19
). Since the one-way clutch (19) is in the direction of transmitting rotation, the drive is also transmitted after the one-way clutch (19), the shaft (20) rotates, and the clutch member (2
7) rotates. Gear (26)
drives the charging mechanism (4) via the gear (3). Gear (3) connects the first motor (1) via gear (2)
However, since both terminals of the first motor (1) are open, it is simply not driven. The gear (21) also drives the film winding mechanism (12) via the gear (11). The gear (10) is also driven by a one-way clutch (
9), the rotation is not transmitted to the shaft (8a) of the motor (8).

As described above, the second motor (8) connects to the charging mechanism section (4).
and the film winding mechanism section (12) at the same time. However, gears (14), (15), (16), (18
), and is driven at a higher gear ratio than in the first mode.

The spool (13) is rotated by the drive of the film winding mechanism (12), and when the film is wound onto the spool (13), the sprocket (31) rotates and the brush (33) is rotated.
) generates on/off pulses. When the number of pulses corresponding to winding one frame of film is counted, the second motor (8) stops. This completes the winding operation.

Similarly, as the sprocket (31) rotates, the brush (33)
), the number of pulses corresponding to one frame of film winding is counted, and when the completion of film winding is detected, the solenoid (25) is energized and the lever (24) resists the force. and is pushed down. As a result, the crane member (22) moves downward and is no longer engaged with the gear (21), cutting off power transmission to the film winding mechanism (12).

When the film has been completely wound up and reaches the end, the solenoid (25) is energized by the end detection signal, and power transmission to the film winding mechanism (12) is similarly cut off.

On the other hand, when charging of the shutter, etc. is completed, the second motor (8
) is stopped, and the energization to the solenoid (30) is stopped.

If the charging is completed faster than the film winding is completed, the solenoid (30) is first activated by the charging completion signal.
energization is stopped, and then the motor (8) is stopped by a film winding completion signal.

Next, the relationship between the torque-rotational speed characteristic of the motor and the torque used in this embodiment will be explained with reference to FIGS. 1a, 1b, 2a, and 2b.

Figures 1a and 1b respectively show the first motor (1), the second motor (8), and the second motor in the first winding mode.
Figure 2b shows the second winding mode in the second winding mode.
FIG. 3 is a diagram showing the relationship between the torque-rotational speed characteristic and the used torque of the motor (8). Fig. 2a shows the case when the deceleration of this embodiment is not performed, and Fig. 2b shows the case when the deceleration of this embodiment is performed.

The relationship between torque and rotational speed is that when the torque is O, that is, when there is no load, the rotational speed is finite and maximum, and as the torque increases, the rotational speed decreases. When the torque is reached, the rotation stops and the rotational speed becomes O.

This relationship is a linear relationship.

The efficiency is O when the torque is O, that is, when there is no load.

As torque increases, efficiency reaches a maximum value and then decreases;
When the torque reaches this value, the rotation stops and the efficiency becomes zero.

The power is 0 when the torque is O, that is, when there is no load. When the torque increases, the power reaches a maximum value and then decreases, and when the torque is reached, the rotation stops and the power becomes O. The maximum value of power is on the side where the rotational speed is lower and the torque is larger than the maximum value of efficiency.

The load torque TL under a desired usage condition is generally set to a value that is sufficiently large for both efficiency and power.

Comparing the first motor (1) and the second motor (8),
Although the output of the first motor (1) is considerably larger, the relationship between the torque-rotational speed characteristic and the torque used is almost the same.

In the second winding mode in which winding is performed at a low speed, the second
Only the motor (8) charges the shutter (not shown) and mirror drive mechanism (not shown).

At that time, if the various mechanisms that transmit the driving force are the same as in the first hoisting mode, the load torque TL will increase as shown in Figure 2a, and it may become too excessive for practical use. comes to a halt. In particular, regarding the relationship between torque and rotational speed, when the battery deteriorates or when used at low temperatures, the relationship line moves to the lower left, which may result in the motor not being able to output load torque.

Therefore, the gear ratio is changed significantly and the load torque TL is increased to 2b.
Reduce it as shown in the figure to prevent it from becoming too large.

When the gear ratio is increased, the rotation speed of the gear becomes lower, the winding time becomes longer, and the operating noise accompanying the higher speed rotation of the gear is significantly reduced.

Next, the circuit will be explained using the block diagram shown in FIG.

In FIG. 4, A is the main circuit. This is a circuit other than the motor drive system, and outputs one pulse when exposure is completed.

B is a counter that counts the number of times the sprocket switch S1 is turned on. Outputs H level from the start of counting until a predetermined number of counts are reached.

C is a decoder. Decodes and outputs forward rotation, reverse rotation, and braking of M2 according to the input.

Ml is the first motor (1), and M2 is the second motor (8).

Sl is a sprocket switch, S2 is a charge completion switch, S3 is a mirror down completion switch, and S4 is a winding mode selection switch.

TI and T2 are one-shot timers.

Ll, L2, L3, L4, and L5 are latch circuits.

Dl and D2 are delay circuits.

Next, the operation of the circuit will be explained.

First, the winding mode selection switch S4 is switched to the first
Explain when selecting a mode.

When the exposure of the camera is completed, the main circuit A outputs an exposure completion signal as an H pulse. The pulse width is shorter than the delay time of the delay circuit D1. Further, the one-shot timer T1 receives the pulse and outputs a pulse corresponding to the one-shot time.

The latch circuit L1 latch is latched by the output from the one-shot timer T1 and rotates the first motor (1) M1. When the charge completion switch S2 is turned on, the latch circuit L1 of the first motor (1) Ml is reset and the rotation of the first motor (1) Ml is stopped. Since the winding mode selection switch S4 is at H level, the output of the mirror down completion switch S3 is output from the latch circuit L.
1 has no relation to the reset. At that time, the one-shot timer T2 sets the first motor (1) M for a predetermined braking time.
Braking is applied to l.

Further, the output of the one-shot timer T1 is delayed by a predetermined time period by the delay circuit D1, and then launches the latch circuit L2. The output of L2 passes through decoder C, thereby causing the second motor (8) M2 to rotate in the normal direction.

The output of the latch circuit L3 is the winding mode selection switch S4
is at H level, an H level output is given to decoder C regardless of the situation.

The latch circuit L2 is reset because the counter B outputs the L level after counting a predetermined number of counts.
Normal rotation of motor (8) M2 is stopped.

Next, the winding mode selection switch S4 is switched to the second
Explain when selecting a mode.

When the exposure of the camera is completed, the exposure completion signal is output as an H pulse from the main circuit A, and the latch circuit L1 latch is latched by the one-shot timer T1 output, and the first motor (
1) Rotating Ml is the same as when S4 selects the first mode. However, the latch circuit L1 is reset because the winding mode selection switch S4 selects the second mode and is at L level, so the mirror down completion switch S3
This is when it turns on. The charge completion switch S2 becomes irrelevant. When the mirror down completion switch S3 is turned on, the latch circuit L3 is latched with a delay of a predetermined time by the delay circuit D2.

The output of the launch circuit L3 passes through the decoder 〇 to reverse the second motor (8) M2. At this time, the output of latch circuit L2 is at L level because S4 selects the second mode, so it is irrelevant to the situation (gives H level output to C. At the same time as latch circuit L3 is latched, latch circuit L4 is latched and the solenoid (30) Electrify Mgl.

The latch circuit L3 is reset and the second motor (8) M
The reverse rotation of 2 is stopped. When counter B finishes counting, latch circuit L4 is reset and solenoid (
30) The energization of Mgl is stopped.

At that time, when switching to the second mode and selecting with RA, the output of the counter B operates the latch circuit L5 only when the charge completion switch S2 is off, and the time until the charge completion switch S2 is turned on operates. Electrify solenoid (25) Mg2.

Next, the flow will be explained with reference to the flowchart shown in FIG. 6 and the timing chart shown in FIG.

In step 1, the release button (39) is pressed,
Release operation begins. Then proceed to step 2.

In step 2, the mirror is raised and the aperture is narrowed down, and the process proceeds to step 3.

In step 3, the shutter is operated and the process proceeds to step 4.

In step 4, the exposure operation is completed, an exposure completion signal is issued, and the winding operation is started. Then proceed to step 5.

In step 5, it is checked whether the winding mode is selected, the first winding mode or the second winding mode. When the first winding mode is selected as the winding mode, the process proceeds to step 10 for the first motor (1) and to step 20 for the second motor (8).

If the second winding mode is selected as the winding mode in step 5, the process advances to step 30.

The first motor (1) is started in step 10 and the process proceeds to step 11.

In step 11, shutter charge, etc., shutter charge, mirror lowering, and aperture opening are performed.
Proceed to step 2.

In step 12, when the charge of all exposure mechanisms such as the shutter is completed, a charge completion signal is issued and the process proceeds to step 13.

In step 13, the first motor (1) is stopped, and the process proceeds to step 60, ending the process.

There is a delay 1 in step 20, and the start of the second motor (8) is delayed by a predetermined period of time from the start of the first motor (1), and the process proceeds to step 21.

In step 21, the second motor (8) is activated and the process proceeds to step 22.

Film winding begins in step 22 and the process proceeds to step 23.

At step 23, a film winding completion signal is issued and the process proceeds to step 24. When a signal for winding the end of the film is issued, the process similarly proceeds to step 24.

In step 24, the second motor (8) stops, and the process proceeds to step 60, ending the process.

In step 30, the second winding mode is selected as the winding mode, the first motor (1) is activated, and the process proceeds to step 31.

In step 31, a mirror lowering completion signal is issued.
The process proceeds to step 32 for the first motor (1) and to step 40 for the second motor (8).

In step 32, the brake is applied to the first emulator (1), and the process proceeds to step 33.

In step 33, a predetermined braking time is determined by timer 2, and the process proceeds to step 34.

In step 34, the terminals of the first motor (1) are opened. The process then proceeds to step 59.

The terminal is closed again in step 59 and step 60
Proceed to and end.

In step 40, there is a delay 2, which takes the time required to start the second motor (8), control and stop the first motor (1), and open the terminal. The process then proceeds to step 41.

In step 41, the solenoid (30) is energized, the lever (29) is raised, the clutch member (27) and the gear (26) are engaged, and the process proceeds to step 42.

In step 42, the second motor (8) is started to rotate in the opposite direction, and the film winding mechanism is started in step 45.
Proceed to.

The film winding process that started with the activation of the second motor (8) in step 45 continues. The process then proceeds to step 46.

When film winding is completed in step 46, a film winding completion signal is issued. A similar completion signal is also generated when the end of the film is wound. The process then proceeds to step 47.

In step 47, it is checked whether or not the shank etc. have been completely chearged. If the process has been completed, the process advances to step 57. If it is not completed, go to step 7, step 481.

At step 7148, the solenoid (25) is energized, the lever (24) moves down, and the gear (21) and the clutch member (22) are disengaged. The process then proceeds to step 49.

In step 49, it is checked whether the charge of the shutter, etc. is completed. If the process has been completed, proceed to step 50. If it is not completed, step 49 is repeated until it is completed. When completed, the process proceeds to step 50.

In step 50, the solenoid (25) is de-energized and the lever (24) is raised to engage the gear (21) and the clutch member (22), and the process proceeds to step 57.

Regarding the chirage mechanism in step 42, the process proceeds to step 55.

In step 55, the shutter etc. are charged, and the process proceeds to step 56.

In step 56, the charge of the shutter etc. is completed, a charge completion signal is issued, and the process goes to step 57.

In step 57, the solenoid (30) is de-energized, the lever (29) goes down, the gear (26) and the clutch member (27) are no longer engaged, and the rotation of the second motor (8) is transmitted to the gear (26). Not done.

The process then proceeds to step 58.

In step 58, the second motor (8) is stopped, and the process proceeds to step 60, ending the process.

In this way, according to this embodiment, when winding at low speed, the gear ratio is changed to a large one, and when the load torque of the motor of an appropriate size is applied, one motor is used at a large reduction ratio to charge the shutter, mirror, etc. Since the film is wound at a slow rotational speed of the spool, the winding time becomes longer and the operating noise decreases accordingly.

Further, when winding at a low speed, pulse driving is not performed, and repeated flow of starting current is avoided, resulting in steady driving in a torque range where the motor has good drive efficiency. Therefore, no power is wasted. Furthermore, it is possible to prevent the operation from stopping due to an abnormal drop in the power supply voltage, and the durability of the motor is improved.

Also, when winding at low speed, the rotational speed of the spool is small,
Therefore, the impact applied to the film is reduced, preventing the film from breaking at low temperatures.

Effects of the G8 Invention According to the present invention, when winding at low speed, the gear ratio is changed to a large one, and when the load torque of a motor of an appropriate size is applied, a small number of motors are used at a large reduction ratio to charge the shutter, mirror, etc., and slow spooling. Because the film is wound at a rotational speed of

Further, when winding at a low speed, pulse drive is not performed, and repeated flow of starting current is avoided, resulting in steady drive in a torque range where the motor has good drive efficiency. Therefore, the motor is driven steadily in a torque range with good driving efficiency, and no power is wasted. Furthermore, it is possible to prevent the operation from stopping due to an abnormal drop in the power supply voltage. Also, the durability of the motor is improved.

Also, when winding at low speed, the rotational speed of the spool is small,
Therefore, the impact applied to the film is reduced, preventing the film from breaking at low temperatures.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the torque-rotational speed j characteristics and load torque of multiple motors, Fig. 2 is a diagram showing a state where the load is changed, Fig. 3 is an exploded perspective view showing this embodiment, Fig. 4 The figure is a block diagram showing the control of this embodiment, FIG. 5 is a timing chart of this embodiment, FIG. 6 is a flowchart of this embodiment, and FIG. 7 is a top view of the camera of this embodiment. Explanation of the symbols of parts] 1...First motor 4...Charging mechanism section 5...Mirror 8...Second motor 9...One-way clutch 12...Film winding mechanism section 13... - Spool 19... One-way clutch 22... Clutch member 4... Lever 5... Solenoid 7... Clutch member 9... Levert... Sprocket 6... Winding mode selection dial 7...・Number mark 8... Indicator 1 motor Fig. 1a Fig. 2a Fig. 2 motor maintenance/b mouth 2b Sun exposure complete −−−−−−−
L--Flute 5 Figure 7

Claims (1)

[Claims] An exposure mechanism including a shutter or a mirror, a film winding mechanism, and a first device installed to charge the exposure mechanism.
motor, and a second motor installed to drive the film winding mechanism.
a motor, a first power transmission means for transmitting the driving force of the first motor to the exposure mechanism, and a second power transmission means for transmitting the driving force of the first motor to the exposure mechanism;
a second power transmission means for transmitting the driving force of the motor, the camera winding device having a larger reduction ratio than the first and second power transmission means;
A third power transmission means 3 transmits the driving force of one of the first and second motors to both the exposure mechanism and the film winding mechanism. a first state in which the driving force of the second motor is transmitted to the exposure mechanism via a transmission means, and the driving force of the second motor is transmitted to the film winding mechanism via a second power transmission means; and a switching means that can be switched to select one of the second states in which the driving force of one of the motors is transmitted to both the exposure mechanism and the film winding mechanism via a third power transmission means. A camera winding device characterized by: