JPH0219933B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winding signal generating device for a focal plane shutter type camera capable of electric winding.

Conventionally, this type of device generates a winding signal for the electric winding drive device and starts winding by the triggering of the rear curtain of the shutter (travel completion) or by the operation of the reflector mechanism which returns to its original state in the case of a single-lens reflex camera. It was on.

However, with this method, the mechanical delay due to inertia at the time of starting the electric drive device cannot be ignored, and even if the camera side is ready for the next winding, it does not start winding, so there is wasted time. It was not possible to capture a large number of frames per unit time.

Furthermore, this tendency is even more pronounced in cases where the winding is linked to a reflecting mirror mechanism, since the winding start time is further delayed. On the other hand, with a device that generates a winding signal after the shutter trailing curtain jumps in, when the running resistance of the shutter curtain increases in cold regions etc., the position where the trailing shutter curtain completes running may become unstable, or the shutter curtain may There was a serious drawback that the bouncing of the winding signal made the generation of the winding signal uncertain, and the next winding operation was not started.

In order to eliminate the instability of the position of the shutter trailing curtain at the completion of its travel and the effects of bounce, it is possible to increase the amount of operation after the shutter trailing curtain has completely covered the aperture, in other words, to increase the amount of movement, but this would reduce the size of the camera. This results in the disadvantage that it cannot be made small.

Therefore, the present invention solves these drawbacks, namely, shortens the wasted time from the end of shooting to the start of the next winding, increases the number of frames taken per unit time, and provides a winding signal that reliably starts winding. The purpose is to provide a generator with a simple configuration.

Hereinafter, the present invention will be explained based on examples.

FIG. 1 shows a schematic configuration diagram of a camera including an electromagnetic release device and an electric drive device, and FIG. 2 shows an embodiment of a winding signal generating device.

In FIG. 1, the electric drive unit MD is configured to be detachable from the camera body CA.

First, in the camera body CA, the electromagnetic release device MR that controls the release of the camera is equipped with a known photometry circuit, an exposure control circuit capable of responding to the output of the photometry circuit, and an exposure control circuit, which is not shown here. It includes electromagnetic means whose operation is controlled by the output of the control circuit. Note that the exposure control circuit may open and close the shutter at a preset shutter speed. The power supply by the power source _E1 for the release device is controlled by a photometric switch _SW1 for operating a photometric circuit in the release device. The SW ₂ for operating the release device is configured to be activated by operating a known camera release button, not shown here. A pluggable connector _C1 provided in the accessory equipment unit is connected in parallel to the switch _SW2 .

Next, in the electric drive unit MD, the plug _P1 can be inserted into the connector _C1 on the camera body CA side. The switch SW ₃ connected in parallel to the plug P ₁ is used when the electric drive unit MD is attached to the camera body CA and the plug P ₁ is connected to the connector C ₁ on the camera body CA side. , switch on the CA side of the camera body
Connected in parallel to SW ₂ . Therefore, when this electric drive unit MD is attached to the camera body CA,
It becomes possible to operate the electromagnetic release device MR by using the switch SW ₃ on the electric drive unit MD side instead of the switch SW ₂ on the camera body CA side.

In the electric drive unit MD, motor 5
1 acts as a drive source when electrically driving the camera. When the electric drive unit MD is attached to the camera body CA, the drive side coupler 52 is connected to a film winding mechanism and a shutter charge mechanism provided in the camera body CA, and is connected to the gears 53 and 53 by the motor 51. The mechanism is operated by being rotationally driven through a gear train consisting of 56 gears. E ₂ is the power supply for the motor 51,
SW ₅ is a power switch in the motor circuit, and t ₁ is a connection terminal for inputting information signals related to camera film winding, shutter charging, etc. operations to the motor circuit.

On the other hand, in the camera body CA, the main winding shaft 5 is connected to a driven coupler 57 that can be connected to the drive coupler 52 of the electric drive unit MD.
8 is connected to a known winding mechanism. The shutter curtain winding drum 59 is connected to the winding main shaft 58 via a gear train consisting of gears 60 to 63. Switch SW ₄ and SW ₆ are connected in parallel,
Both of them work together to control on and off in response to the shutter release and charge, and the motor is turned on only from the end of the shutter curtain run until the shutter charge is completed, that is, only while the camera is in the winding phase. It is arranged to turn on the power supply circuit. The connection terminal _t2 is connected to the switches _SW4 and _SW6 , and when the electric drive unit MD is attached to the camera body CA, it is connected to the terminal _t1 on the side of the electric drive unit MD to connect the above switch.
Input SW ₆ 's on/off signal to the motor circuit.

Next, the operation of the camera system having the above configuration during photographing will be explained.

Attach the electric drive unit MD to the camera body CA, connect its plug P ₁ to the connector C ₁ , connect the drive side coupler 52 to the driven side coupler 57, and connect the terminal t ₁ to the terminal t _2. Then turn on the photometry switch SW ₁ on the camera body CA side and the power switch SW ₅ in the motor circuit on the electric drive unit MD side.

Now, assuming that the camera body CA side has just completed the preparation for shooting, such as film winding, shutter charging, etc., the camera body
Switches SW ₄ and SW ₆ on the CA side are turned off,
Motor 51 is therefore at rest because its circuit is not closed.

In this state, when either the first operation switch SW ₂ on the camera body CA side or the second operation switch SW ₃ on the electric drive unit MD side is turned on, these switches SW ₂ and SW ₃ are connected to each other. Since they are in a parallel relationship, when either switch is turned on, the electromagnetic release device MR is activated in the same way, and the shutter is released by electromagnetic control.

When the shutter release is performed and the shutter curtain runs, the shutter curtain take-up drum 59 rotates in a direction opposite to that during shutter charge. The switch SW ₄ is turned on just when the shutter curtain has finished running, that is, when the exposure of the film has finished. As a result, on the electric drive unit MD side, the motor circuit is closed, so the motor 51 is activated, and its driving force is transmitted to the camera body CA side via gears 53 to 56 and couplers 52 and 57. The rotation of the main shaft 58 winds the film and charges the shutter in a known manner. Switch SW ₆ is turned on during charging, and after turning on switch SW ₆ , switch SW ₄ is turned off. Then, when film winding and shutter charging are completed, switch SW ₆ is turned off as described above. To,
Motor 51 has its circuit opened and stops.

Therefore, the first and second operation switches
As long as either SW ₂ or SW ₃ is kept on, shooting will be repeated, and when the switch is released, the next shutter release will be blocked, so the camera body CA and electric drive unit MD will always keep the film moving. The camera will stop when winding and charging of the shutter are completed, that is, when preparations for shooting are completed.

The hoisting lever 1 transmits the hoisting force to the axle 3 via a one-way clutch (not shown) located between the axles 2 and 3. A first hoisting gear 4 is attached to the shaft 3. The second hoisting gear 5 is attached to the hoisting shaft 8. The shutter charge gear 6 is in a position where it can mesh with the shutter gear 7. Each element of the shutter is interlocked with gear 7 and below, but it is not shown because it is known per se.

The winding stop cam 9 is also attached to the winding shaft 8. The hoisting completion signal cam 10 is attached to the hoisting shaft 8 together with a coupling 57 below it.
The stopper claw 12 has arms 12a to 12d. The arm 12a is for stopping the winding and engages with the protrusion 9a of the winding stopping cam 9. The arm 12b is in a position where it is pushed by the protrusion 9a of the wind stop cam 9 in order to set the wind stop claw at the wind stop position.

The arm 12c can be locked by a notch 20a of the pawl 20 to hold the pawl 12 at the unwinding position. A spring pin 13 and a shutter trailing curtain signal pin 16 are attached to the arm 12d. Spring 14 is connected to pin 1 fixed to the camera body.
5 and the pin 13 to urge the winding stopper claw 12 to rotate counterclockwise. Contact point 17 and spring 18 are the above-mentioned switch SW _4.
Configure. Further, the spring 18 is hung between the shutter trailing curtain signal pin 16 and the pin 19.

The retaining pawl 20 is supported by a shaft 21, and the notch 2
The arm 12c of the stopper claw 12 is locked at 0a, and the tip 20b can come into contact with the pin 24a of the shutter rear curtain claw 24. This tip 20b and pin 2
4a means a predetermined gap (gap) when winding is completed.
It is located with. Spring 23 is pawl 2
0 clockwise.

The shutter rear curtain pawl 24 is rotatable around a shaft 25 and biased clockwise by a spring 27 via a pin 28. However, when the coil 31 is energized, it is held in the illustrated position by the suction action of the armature 29 and the yoke 30. The coil 31, yoke 30, and armature 29 constitute an electromagnet for controlling the shutter trailing curtain. The drum 59 is rotatably supported on the shaft 34. A shutter trailing curtain (not shown) is wrapped around a drum 59. The drum 59 is biased clockwise by a drive spring (not shown). drum 59
The shutter rear curtain pin 32 fixed to the shutter rear curtain pin 32 can be engaged with one end 24b of the shutter rear curtain pawl 24, and activation and running of the shutter rear curtain is controlled by switching on and off this engagement.

A release shaft 36 is attached to the release push button 35. The contact pieces 37 and 38 constitute a switch _SW2 . Since this embodiment is an example of a so-called electromagnetic release, the shaft 36 is adapted to push the contact piece 37 of the switch _SW2 . A locking portion 37a formed by bending the contact piece 37 engages with the arm 12c when the contact pieces 37 and 38 are in contact with each other, and serves to prevent the winding pawl 12 from rotating counterclockwise. .

The winding completion signal lever 39 is supported by a shaft 40. A pin 41 provided on the winding completion signal lever 39 is in contact with a contact piece 42, thereby controlling the contact between the contact pieces 42 and 43. Contact piece 4
2 and 43 constitute a switch SW ₆ which generates a camera winding completion signal.

Next, the operation of this embodiment will be explained separately for the case where the release trigger is performed on the camera body side, and the case where the camera and an electric drive device are combined and the release trigger is performed on the electric drive device side.

(1) Operation when triggering the release from the camera body side; In Figure 2, which shows the winding completed state, when the release push button 35 is pushed down, the release shaft 36 also lowers and the contact piece 37 is pushed, and the contact pieces 38 and 37 come into contact. do. Therefore, switch SW ₂ is turned on and the electromagnetic release device starts the shutter front curtain. The exposure control circuit cuts off the current flowing through the coil 31 after the required shutter time has elapsed. Therefore, armature 29 and yoke 3
0 disappears, and the shutter rear curtain pawl 24 begins to rotate clockwise due to the biasing force of the spring 27.

When the pin 24a rotates to a certain extent and the rotational speed increases, the pin 24a pushes the tip 20b of the pawl 20.

At this time, the engagement between the shutter rear curtain pin 32 and the one end 24b of the shutter rear curtain claw 24 is approximately half or more disengaged, or is completely disengaged. The retaining pawl 20 releases the engagement between the arm 12c and the notch 20a by the action of the pin 24a.

Therefore, the movement of the spring 14 causes it to rotate counterclockwise. However, the stopper claw 12 is prevented from rotating by the locking portion 37a of the contact piece 37. This eliminates the inconvenience that would occur if a photograph was taken while the winding force was applied to the winding lever 1 by mistake.

That is, this prevents the inconvenience that if the arm 12a of the wind stopper pawl 12 and the wind stop cam 9 are disengaged when the rear curtain of the shutter starts, the next film winding will start during photography. Furthermore, it also has a mechanism that prevents the next winding even if the push button is held down after taking a picture.

Without this movement, if the push button is held down, the next release will be performed inadvertently at the same time as winding is completed.

After the shutter rear curtain pin 32 and one end 24b of the shutter rear curtain pawl 24 are disengaged by more than half, the pin 24a moves the stopper pawl 20 to the spring 2.
3 and move it counterclockwise. Pin 24 here
The reason why a gap is provided between a and the tip 20b of the retaining claw 20 will be explained. If there is no gap, if you mistakenly apply force in the winding direction to the winding lever 1, pressure will be generated between the protrusion of the winding stop cam 9 and the arm 12a, and the friction force will cause the spring to spring out. Reduces the power of 14. Therefore, arm 12
The pressure between c and the notched portion 20a is reduced. At this time, the force required by the pin 24a to rotate the locking pawl 20 counterclockwise is small, so the clockwise rotation speed of the shutter rear curtain pawl 24 increases, causing the coil 31 to rotate at a predetermined time. Even if you cut off the power to the shutter, the shutter time will become shorter. In other words, the running speed of the shutter trailing curtain pawl 24 becomes uneven. In order to prevent this, either the shutter rear curtain pin 32 and one end 24b of the shutter rear curtain claw are disengaged from each other, and then the pin 24a and the tip 20b are brought into contact with each other.
Alternatively, even if the engagement is not disengaged, if the shutter rear curtain pawl 24 has a certain amount of kinetic energy, the change in the rotational force of the stopper pawl 20 in the counterclockwise direction can be virtually ignored. , a gap is provided between the pin 24a and the tip 20b. In this way, the engagement between the arm 12c and the notch 20a is released, but this state will continue unless the pressure on the release button 35 is released.

Now, when the press of the release push button 35 is released after photographing, the engagement between the locking portion 37a and the arm 12c is released.
Therefore, the stopper pawl 12 rotates counterclockwise,
After the arm 12a is disengaged from the winding stop cam 9, the spring 18 and the contact 17 come into contact. Therefore, switch SW ₄ is turned on and generates a signal indicating that shooting has been completed and the next winding is possible. This occurs at time T ₁ in FIG. This timing can be set by adjusting the distance between the spring 18 and the contact 17.

Winding is performed by an electric winding device via the winding lever 1 or the coupling ring 57.
When using the camera alone, use wind-up lever 1.
When the winding lever 1 is operated in the direction of the arrow, the shaft 2
The first hoisting gear 4 is rotated counterclockwise via a one-way clutch (not shown) between the clutch and the shaft 3, and the second hoisting gear 5 that meshes therewith is rotated one rotation clockwise. As a result, the winding completion signal cam 10 also rotates counterclockwise via the shaft 8. During this rotation, the lever 39 is rotated counterclockwise by the cam 10, so that the pin 41 brings the contact pieces 42 and 43 into contact. Therefore, switch SW ₆ is turned on. This is a phenomenon that occurs at time _T2 in FIG. Since the gear 5 rotates the winding shaft 8 once, the shutter gear 7 is charged by the shutter charge gear 6, and the shutter leading curtain system (not shown) returns to the winding complete position, and the shutter trailing curtain drum 59 also moves to the shutter trailing curtain pin 32. returns to the position shown in the second figure.

Also, since the protrusion of the winding stop cam 9 pushes the arm 12b away clockwise and rotates once, the winding stopper claw 12
rotates clockwise. Therefore, the signal pin 16 pushes the spring 18 in the energy storage direction, and as a result, the contact 1
The contact between 7 and the spring 18 is broken and the switch SW ₄ is turned off. This occurs at time T ₃ C in FIG. arm 1
2c also returns to the position where it is locked at the notch 20a of the locking claw 20. However, the shutter rear curtain pawl 24 is returned to a position where the armature 29 and the yoke 30 are in contact with each other by a restoring mechanism (not shown).

When the winding shaft 8 completes one positive rotation, the winding completion signal lever 39 falls into the recess of the winding completion signal cam 10. As a result, the contact pieces 42 and 43 are separated and the switch SW ₆ is turned off. This is the time shown in Figure 3.
Occurs at T ₄ .

On the other hand, when the electric drive device MD is attached to the camera body CA and winding is performed by the electric drive device, the operation is as follows. The operation of the mechanical system at this time depends on whether the shaft 8 is rotated by the winding lever 1 or by the motor 51. Since the process is the same as described above until the shooting is finished, the explanation will be omitted. Now, finish shooting and press the release button 35.
After releasing the pressure, switches SW ₄ and SW ₆ switch to the third
It operates as shown in the figure, so from time T ₁ to time T ₂
During this time, the power supply circuit of the motor 51 is closed. Of course, power switch SW ₅ is turned on. Accordingly, when the switch SW ₄ is turned on indicating completion of photographing, the motor 51 is rotated, and the gear 6 is rotated via the coupling 57, thereby performing shutter charging and film winding. When the winding is completed and the switch SW ₆ is turned off, the power supply to the motor 51 is cut off and the motor 51 stops rotating. Therefore, when using the electric drive device MD, the operation from shutter release to photographing is completed by pressing the release push button 35.
The winding operation is started when the push button 35 is released, and this operation is repeated by repeatedly pressing and releasing the push button 35.

The above is the operation when the release is triggered by the release push button 35 of the camera to take a picture, and the film is wound using the winding lever 1 or the electric winding device MD.

(2) Operation when triggering the relay on the electric drive device MD side; At this time, the relay release push button 35 on the camera body CA side is not used (not pressed), so the bent part 37a of the contact piece 37 of the switch SW ₂ is connected to the arm 12c. It has evacuated outside the rotating orbit. Therefore, when the release push button 46 of the electric drive device is pressed and the switch SW ₃ is turned on in the winding completion state shown in the second figure, the leading shutter curtain is moved by the electromagnetic release device MMR as described above. After that, when the exposure control circuit finishes counting the exposure time, the coil 3
1 is de-energized and the lever 24 rotates clockwise. As a result, the retaining pawl 20 is rotated counterclockwise against the spring 23, and at this time, the bent portion 37a
is outside the orbit of the arm 12c, so the stopper claw 12 is immediately rotated counterclockwise by the spring 14.
Therefore, the arm 12a releases the locking of the winding stop cam 9, and subsequently the spring 18 and the contact point 17 come into contact to turn on the switch _SW4 . That is, immediately after the shutter trailing curtain starts running, the switch _SW4 is turned on and a winding signal is generated.

When the switch SW ₄ is turned on, power is supplied to the motor 51, but there is a certain time delay before it actually rotates and rotates the coupling 57. This is due to the delay in starting the motor 51 and the rotation of the motor due to gears 53 to 5.
6 and the time required for the signal to be transmitted to the coupling 57. It is sufficient to set this certain time delay to be larger than the time required for the shutter trailing curtain to complete its travel through the aperture. Incidentally, if the motor 51 has good starting characteristics and starts up very quickly, it is also possible to use a delay circuit that forms the predetermined period of time between when the switch SW ₄ is turned on and when power is supplied to the motor 51. In this way, the electric drive device MD starts winding after the shutter trailing curtain completes running.

FIG. 4 is a timing chart showing the running (movement) characteristics of this shutter curtain. In FIG. 4, curve a shows the running characteristics of the leading shutter curtain after the shutter is released, curve b shows the running characteristics of the trailing shutter curtain activated by the exposure control circuit, and curve c shows the running characteristics of the leading shutter curtain after being rolled up. The movement characteristics of each are shown below.
In this figure, the time Tx from the start of running of the rear shutter curtain to the time of completion of running of the rear shutter curtain corresponds to the fixed delay time.

Curve c' shows the shutter curtain movement characteristic when winding is performed after the shutter trailing curtain has completed running as in the conventional case.
Now, if we consider the sum of the time from release to the completion of shooting (the completion of the rear shutter curtain run) and the winding time, it will be Ta in this embodiment and Tb in the conventional technology. If Ta and Tb are one cycle of operation of the camera and electric drive device, then the period is Ta<Tb
Therefore, it can be understood that in this embodiment, when the switch SW ₃ is kept on and continuous shooting is performed, the frame speed becomes extremely fast.

FIG. 5 is a perspective view showing another embodiment of the present invention, and FIGS. 6 to 8 are operational views thereof. Components that are the same as those in FIG. 2 are given the same reference numerals. In this embodiment, switches SW ₄ and SW ₆ are replaced with one switch SW ₇ , and a differential mechanism is used to perform the same function as described above.

In FIGS. 5 and 6 showing the completed winding state, the lever 100 is depressed into the recess 10'a of the signal cam 10'. Since the lever 101 is biased counterclockwise by the spring 102, the lever 10 is always pressed against the cam surface of the cam 10'. lever 10
A contact point 104 is provided at the tip of a rod 103 implanted in the rod 1 . This contact 104 and spring 18 constitute a switch _SW7 . Now, when the winding is completed, the spring 18 that contacts the pin 16 is in a position where it does not come into contact with the contact 104. Lever 1
This is because the number 00 has fallen into the recess 10a'.

Next, after the release, when an exposure end signal is generated and the lever 24 is activated and rotated clockwise, the locking of the winding stopper pawl 12 by the stopper pawl 20 is released. At this time, when the release trigger is triggered by pressing the release push button 35, when this pressure is released, and when the release trigger is triggered by pressing the push button 46, the winding pawl 12 is immediately rotated counterclockwise by the spring 14. be done. As a result, when the pin 16 is retracted counterclockwise, the spring 18 comes into contact with the contact 104, so that the switch SW ₇ is turned on and generates a winding start signal. Spring 18 and contact 1
04 is ensured by the restoring force of the spring 18 itself. This state is shown in FIG.

When the shaft 8 is rotated clockwise by the winding force after the trailing shutter curtain has completed its travel, first, while the lever 100 is in contact with the recess 10'a, the spring 18 and the contact 104 are in the relationship shown in FIG. Switch SW ₇ is on. Next, the lever 100 is moved to the cam 1
0', the lever 100 is rotated counterclockwise and the lever 101 is rotated clockwise. As a result, the contact point 104 is also rotated clockwise, but the spring 18 is also moved counterclockwise while maintaining its contact while being biased. Therefore switch SW ₇ is still on. This state is shown in FIG.

As the winding progresses, the arm 12b of the winding stopper 12 comes into contact with the winding stopper cam 9 just before winding is completed, and the winding stopper 12 is rotated clockwise so that the arm 12a enters the orbit of the winding stopper cam 9. In this state, it is locked by the stopper claw 20. When winding is completed, the lever 100 falls into the recess 10'a again.
Therefore, the lever 101 and the contact 104 rotate counterclockwise, and at this point the switch SW ₇ is turned off and a winding completion signal is generated. This state is the 6th
This is the state shown.

In the above-mentioned embodiment, element 51 controls the motor, element 9 controls the winding interlocking member, element 12 controls the winding member, element MR controls the shutter speed control circuit, and elements 20, 24, and 29 control the release linking member. means, elements
SW ₄ , SW ₆ , and SW ₇ constitute switch means, respectively.

As described in detail above, according to the present invention, the generation of the winding start signal by the switch means is made independent of the movement of the shutter trailing curtain (travel completion operation of the shutter trailing curtain). It is possible to obtain a hoisting start signal that is not affected by bounce.

Since the switch means that generates the winding start signal is linked to a member that is activated in response to the exposure end signal from the exposure control circuit, the frame speed is faster than in the conventional case where the motor is driven in response to the jump of the shutter trailing curtain. becomes faster.

The switch means for generating the winding start signal is linked to the operation of the winding stopper to release the winding stop, so if the winding stop is not released for some reason, the switch will not operate and the winding start signal will not be generated. In other words, it is possible to provide a safety device function of generating a hoisting start signal only when hoisting is possible.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a camera including an electromagnetic release device and an electric drive device, Fig. 2 is a perspective view showing an embodiment of a winding signal generating device according to the present invention, and Fig. 3 is a diagram showing the switch shown in Figs. 1, 2, and 2. An operation timing chart of SW ₄ and SW ₆ , FIG. 4 is a shutter movement characteristic diagram, FIG. 5 is a perspective view showing another embodiment of the winding signal generator according to the present invention, and FIGS.
FIG. 3 is an operational diagram of the main components shown. Explanation of symbols of main parts, winding cam...9, winding member...12, reset member...20,2
4, 29; 103, 105, 24, 29; Switch means...SW ₄ , SW ₆ ; SW ₇ .

Claims (1)

[Scope of Claims] 1. A motor that performs a film winding operation, a winding interlocking member that interlocks with the film winding operation by the motor, a first position for locking the winding interlocking member, and a first position for releasing the locking. a winding stop member movable between two positions, and when the winding of one frame of film is completed by the motor, the winding interlocking member is moved by the winding stop member in the first position. A shutter speed control circuit that generates an exposure end signal to run a shutter trailing curtain in a camera capable of electric film winding that locks the shutter curtain and prohibits film winding operation; and an exposure end signal that is emitted from the shutter speed control circuit. a release means that is activated in response to and moves the winding member from a first position to a second position and causes the shutter trailing curtain to travel; and moving the winding member from the first position to the second position. A hoisting signal generating device comprising: a switch means for generating a hoisting start signal for starting the motor in conjunction with the hoisting signal generation device.