JPS6029096B2 - Motor drive device in single-lens reflex camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor drive device that uses a plurality of drive motors to set up a camera mechanism for shutter operation in a single-lens reflex camera, and particularly relates to a quick return mirror drive mechanism. The optical path return operation of the mirror and the mirror charging are performed simultaneously.

As a motor drive means in a single-lens reflex camera for automatic rewinding or winding of film,
Conventionally, an external drive mechanism was generally configured separate from the camera body.
A method has been adopted in which this external drive mechanism is connected to the camera body when necessary.

Incidentally, the convenience of camera operability by this type of motor drive has recently been recognized, and as the usage rate of motor drive operation connected to the external drive mechanism increases, it is becoming more and more popular to use a camera with a motor drive built into the camera body. Development of this mechanism has become desirable, and there is a strong demand for a camera with a built-in mechanism, even the size of the current camera. By the way, according to the conventional motor drive mechanism, a single drive motor stores the operating force for each mechanical part necessary for camera operation. In order to match the drive start timing or drive completion time for each of these mechanisms for driving, it is necessary to make fine adjustments to the related mechanisms of these mechanisms and to finish the mechanisms with high precision. Moreover, in order to transmit the driving force from one drive source to each of the above-mentioned mechanisms, if the driving force is efficiently transmitted to one of these mechanisms, an intermediate transmission mechanism is required to transmit the driving force to the other mechanism. This intermediate mechanism causes a power loss, which requires a large motor with high power as a drive source, and also requires a large battery with a large capacity as a power source. there was.

On the other hand, modern single-lens reflex cameras have undergone a high degree of technical improvement in their mechanical structure and external shape, and the interior of the camera is spacious enough to accommodate the large motor or large battery. Therefore, in order to accommodate the driving section and the power supply section, the follower device employs the above-mentioned external accommodation mechanism. Considering the mechanical conditions on the driven side in this type of motor drive mechanism, some camera mechanisms do not necessarily require set operations to be performed in a series of operations or simultaneously.

In other words, there are a film winding mechanism section and a shirt charge mechanism section, and each of these mechanism parts functions as an independent operation, but the film winding mechanism and shirt charge mechanism are used for fixed amount winding of the film and for double-winding the film. There is a strong mechanical connection between the two mechanisms in the heavy lifting prevention mechanism, etc.
Moreover, since a nearly complete and advanced device configuration is being sought in current camera mechanisms, these can be viewed as an integrated mechanism for film winding and shutter charging. Therefore, when we examine the relationship between the related operations between the two mechanisms, the film winding and shutter charge mechanism and the mirror operating mechanism, we find that there is a condition for sequential operation between the two mechanisms at the operating timing of each mechanism. However, there is no condition that requires simultaneous operation between them, and there is little correlation between them, especially at the time of accumulating energy for the short-term operation of these mechanisms, and furthermore, there is no necessary relationship. is the start or end signal element for the operation period of each mechanism, and a mechanical mechanism that involves force transmission is not necessary for transmitting these signals.Also, for the mirror drive mechanism, there are various quick return machines. When considering the structure, when driving the winding charge by conventional lever operation and motor drive, in addition to accumulating the driving force to flip the mirror out of the optical path area, it is also possible to add the accumulating force for returning the mirror to the optical path castle. I also tried to do this.

Moreover, this accumulated force for returning the mirror is sufficient to ensure the safety of securing the mirror flip-up position and the reliability of the return operation for different camera postures, even though the mirror return operation itself is sufficiently possible due to the mirror's own weight. In order to achieve this, and further to ensure swiftness of the operation, devices are being constructed that have a firing force that is considerably stronger than the stored firing force that is originally required for the return operation. Therefore, the accumulation of return force for this quick return mirror operation has become one of the factors that requires a high-power motor, especially in a motor drive device. Therefore, in the present invention, the camera set operation, which conventionally was performed by simultaneous firing and accumulating operation of all camera operating mechanisms, can be divided or separated under effective division, and each mechanism is driven by each drive source. so that the operation can be performed at the most reasonable time during a series of camera operations.
Moreover, in the quick return mirror drive mechanism, the mirror return drive is performed by a motor drive together with the stored force for the next flip-up operation, without using the energizing force. In this case, it is possible to disperse the drive torque and eliminate the need for surplus energy storage, so each motor can be small and the related control between each mechanism can be controlled. Since this can be done using electrical signals such as opening and closing of switches, it is possible to assemble these motors and related mechanisms by effectively utilizing the small assembly gap in conventional camera mechanisms.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Illustrated embodiments of the apparatus of the present invention will be described in detail below.

FIG. 1 is a configuration diagram showing an example of the film winding and shutter charging mechanism in the device of the present invention, in which one of the plurality of small motors used in the device of the present invention is incorporated in the inner cylinder of the film spool 9. .

Gears 2 and 3 serve as a driving force transmission system for the motor MI.
and '4, the gear 5 is connected to a gear 5 whose drive is controlled to rotate once during one operation. A notched gear 7, a sprocket 8, a connecting gear 10, and a one-rotation limiting plate 11 are fixed to a rotating shaft 5a integral with the gear 5. and,
The connecting gear 10 is connected to the Subur gear 1 via the relay gear 12.
3 are meshed with each other, and a friction mechanism is provided between the spool gear 13 or relay gear 12 and the spool 9 to absorb excess rotation amount. Further, the notched gear 7 is a gear interlocked with the shutter charge mechanism side, and has a part of its tooth row cut out, so that it serves as a clutch in the coupling operation.

That is, the leading gear 14 faces the meshing castle of the gear 7, and the rear gear 15 is arranged in a one-way vertical connection with the leading gear 14. Leading curtain winding gears 16 and 17 are meshed with these gears 14 and 15, respectively. These gears 16 and 17 are integrally attached to a leading curtain winding shaft 18 and a trailing curtain winding shaft 19, respectively. One end of the leading curtain tensioning lever 20 faces the turning castle of the protrusion provided on the side surface of the leading curtain gear 14, and the other end of the lever 20 is moved in its final operating range as shown in the arrow in the figure by the flip-up movement of the mirror. It is designed to be pushed in the direction of the mark.

Further, one end of the rear screen tensioning lever 21 is made to face a turning castle of a projection (not shown) provided on the side surface of the rear screen gear 15, and the lever 2
An adsorbing iron piece 23 of an electromagnetic magnet 22 for starting the shutter shut is attached to the end of the pond 1. On the other hand, the rear winding shaft 24
A pin 26a is provided on the side surface of the rear interlocking gear 26 which is meshed with the gear 25 integral with the gear 25, and one end of the relay lever 27 is made to face the turning area of the pin 26a.

The end of this relay lever 27 is connected to one end of a film fixed amount winding regulating lever 28.
The other end of 8 serves as a side-locking piece and is adapted to fit on the side with the notch of the one-rotation limiting plate 11. And S
2 is a switch of the electric circuit which will be described later, and the regulating bar 2 is
The movable contact piece is operated by 8. In the film winding and shutter charging mechanism of the apparatus of the present invention shown in the first figure, the rotation shaft 5a is rotationally driven by the rotational drive of the motor MI through the speed reduction mechanism of the gears 2, 3, and 4 by the control operation described later. When the shaft 5a rotates once, one end of the regulating plate 28, which had been in pressure contact with the outer periphery of the one-turn limiting plate 11, falls into the notch, preventing rotation of the shaft 5a, and controlling the motor by the control of an electric circuit to be described later. MI's drive production will also be halted.

By this rotation of the rotation shaft 5a, the film spool 9
One rotation of the sprocket 8 completes the winding of one frame's worth of film, and the notched gear 7 drives the front curtain gear 14 and the rear curtain gear which is integrally driven to rotate in the winding direction. 15, the front curtain gear 16 and the rear curtain gear 17 are rotationally driven to complete the shirt charge. From the state shown in the first figure showing the completed state of film winding and shutter charging, the front curtain tensioning lever 20 is rotated in the direction of the arrow in the figure at the final stage of the mirror-up operation, which will be described later. The other end of the gear 14 is brought into contact with the protrusion on the side thereof, and the rotation of the gear 14 is released. As a result, the gear 15 is moved along with the front curtain in the opposite direction to that at the time of charging. Even with stored power, it rotates and moves.

After a predetermined period of time has elapsed after the shirt is opened due to this operation, the electromagnetic magnet 22 is de-energized and released from its hold on the adsorption iron plate 23, so that the locking action of the rear curtain gear 15 by the rear curtain tensioning lever 21 is released. Then, the rear curtain runs and the shutter shutter is closed. At the end of this shutter closing operation, the trailing curtain movement gear 26 meshes with the gear 25 integrated with the trailing curtain winding shaft 24.
The lever 27 is pushed clockwise in the figure by the pin 26a, and this operation rotates the regulating lever 28 in the direction of the arrow in the figure. As a result, the lever 28 releases the locking action of the other end of the lever 28 on the rotation limiting plate 11 and closes the switch S2. In contrast to such a film winding and shutter charging mechanism, FIG. 2 shows an embodiment of the mirror drive mechanism of the apparatus of the present invention.

In the figure, reference numeral 30 denotes an electromagnetic magnet for triggering the release that is closed by operating the shutter button or the like and is regulated by the release switch SI, and has its pole core facing the attraction piece of the release hook lever 31. Incidentally, instead of this electromagnetic release mechanism, the lever 31 may be configured to be operated by a Leeds pestle connected to a Leeds plow. The mirror charge lever 32, whose one end is locked to the rear foot lever 31, has a cage spring 33 hooked between it and the stationary part of the equipment, and the mirror up lever 35 is attached to a pin 34 installed in a gutter at the edge of the pond. One end of the bale is constantly pressed under the action of a weak spring 46. This mirror up lever 35
A mirror pin 36 extending from a mirror holding frame (not shown) is exposed at one end, and one end of a shutter actuating lever 38 is energized by a pin 37 provided at the other end of the lever bar 35. Even with an acting force of 47, the bale is always pressed.
Incidentally, the mirror pin 36 may be configured such that one end of the mirror up lever 35 is formed into a fork shape, and the mirror pin 36 is fitted between the fork portions. Further, S3 and S4 are switches for electric circuits, which will be described later, and are arranged to open and close in conjunction with the operation of the mirror up lever 35. Since these switches S3 and S4 respond to the operation of the lever 35, that is, the operating state of the mirror, they may be arranged at the flip-up position of the mirror, the optical path oblique position, etc., in addition to the arrangement positions shown in the figure. It's okay. On the other hand, the other end 32a of the mirror charge lever 32 is inserted into one end of an interlocking lever 41 connected to an aperture drive lever 43 via a spring 48 for absorbing surplus force.

A pin 39 is provided at the other working end of the lever 32.
is faced to the operating position of the drive cam plate 40. A gear 42 integrated with the drive cam plate 4 and a drive gear 44 of another motor M2 among the plurality of motors in the device of the present invention.
and is connected via a reduction gear system 45. Then, the switch S2 is placed facing the regulation lever 28 shown in the first diagram.
FIG. 3 shows a power supply regulation circuit for the motors MI and M2, which includes the switches S3 and S4, together with the release starting electromagnetic magnet 30 and the release switch SI. That is, using the battery E as a power source, the switch S
2 and switch S3 are connected in series to form a power supply circuit to motor M2, and a switch S4 is inserted and connected in series through switch S2 to form a power supply circuit to motor MI.

The battery E is provided with a series connection circuit of the battery switch SI and the magnet 30. Therefore, when the release switch SI is closed by a release operation or the like, current from the battery E flows through the electromagnetic magnet 30, and the release hook 31 is attracted to the magnet.

With this operation, the mirror charge lever 32 is unlocked, and the lever 32 is rotated clockwise in FIG. 2 by the force of the cage spring 33. As a result, the pin 34 of the lever 32 similarly pushes the mirror up lever 35 clockwise, pivoting the mirror pin 36 at one end of the lever 35, and flipping the mirror out of the optical path. On the other hand, at the same time as this operation, the narrowing lever 43 moves in the direction of the arrow in the figure via the connecting lever 41 which holds the other end 32a of the lever 32, thereby performing the narrowing operation of the well-known automatic narrowing mechanism. Also, with this operation, the pin 9 provided at the other working end of the lever 32 moves from a position away from the stepped portion 40a of the drive cam plate 40 in the previously charged state to a position where it supports the stepped portion 40a. do. And the mirror up lever 3
The lever starting lever 38 is activated by the pin 37 of 5.
It is rotated counterclockwise in the same figure against the acting force of
In the rotation range when the mirror-up is completed, the front curtain tensioning lever 20 shown in the first figure is moved in the direction of the arrow in the top of the figure to perform the above-mentioned shutter operation.

Then, by rotating the second mirror up lever 35, the circuit changes from the state shown by the solid line in FIG. 1. Regulation lever 28 at the final stage of the shatter motion (the final stage of the trailing motion) in the illustrated mechanism
As the switch S2 is closed, the motor M2
A power supply circuit is constructed.

Then, the motor M2 starts and moves the drive cam plate 40 to the second position.
It rotates counterclockwise in the figure. Therefore, the pin 39 which has come into contact with the stepped portion 40a of the cam plate 4 is pushed upward toward the upper right in FIG. 2 while sliding against the cam peripheral surface.

As a result, the charge lever 32 rotates counterclockwise in the figure while extending the energy storage spring 33. As the lever 32 rotates back due to this mirror charging operation, the mirror up lever 35 also rotates back counterclockwise in the figure, so the mirror bin 36 follows the lever 35 and brings the mirror to the optical path diagonal position. At the same time as returning, release start lever 3
8, the aperture lever 43, etc., are returned to their previous states. This rotational return of the charge lever 32 continues until the bottle 39 is on the cam peripheral surface farthest from the center of the drive cam plate 40, and at the final stage of this return operation, one end is locked by the lever foot lever 31. and switch S3 at the other end
is opened to open switch S4.

By switching the switches S3 and S4, the third illustrated circuit cuts off the power supply to the motor M2 and simultaneously starts supplying power to the motor MI. Therefore, due to the inertial rotation after the power supply to the motor M2 is stopped, the drive cam plate 40 rotates all over, and the pin 39 is rotated.
is located at a position facing the stepped portion 40a away from the longest cam circumferential surface from the center, and the above-described film winding and shutter charging operations in the first illustrated mechanism are performed by starting the motor MI. In this way, in the device of the present invention, two drive motors are used to drive the camera operating mechanism, and the return of the mirror to the optical path range is performed by the motor drive to return the charge lever to the charge position. Since they are used in combination, first of all, it is possible to incorporate them into the camera by miniaturizing the individual drive motors by distributing the drive sources, and it is not necessary to store energy for the mirror return spring in the mirror operating mechanism. This is effective in further downsizing the motor by reducing the drive load during the charging operation, and the mirror charging operation for mirror operation including mirror return is performed immediately after the trailing curtain travels in the shutter operation. This is effective in reducing the time required for the photographing operation by the motor drive as much as possible. Furthermore,
As mentioned at the beginning, the device of the present invention does not require a high-precision connecting mechanical device for timing adjustment between each set mechanism on the side of the camera, has a simple structure, and is highly durable and resistant to overload. It has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the film winding and shutter charge mechanism in the apparatus of the present invention, FIG. 2 is a perspective view of an embodiment of the mirror operating mechanism, and FIG. FIG. 2 is a circuit diagram showing an example of an electric circuit. M1...Motor for film winding and shutter charge, M2...Motor for mirror charge, 2
6... Rear curtain interlock gear, 28... Film fixed amount winding regulation lever, S2... Switch linked to end of shirt charge and end of trailing curtain running, 32...
...Mirror charge lever, 36...Mirror pin, S3,
S4...Switch linked to mirror operation. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. The first motor performs the shutter charge and film winding drive of the motor drive mechanism, and the force for raising the mirror of the mirror drive mechanism is applied when lowering the mirror by the second motor at the end of the shutter operation, and the raising force is applied by the hook means. A single-lens reflex camera mechanism with a focal plane shutter that holds a mirror provided with a 100 mm in a lowered position and raises the mirror by the biasing force, an electromagnet that releases the lock of the hook means, and a shutter release operation. A first switch that operates the electromagnet, a second switch that is closed when the shutter operation is completed, a third switch that is opened when the mirror is in the lowered position and closed when the mirror is moved from the lowered position, and a third switch that is closed when the mirror is in the lowered position. a fourth switch that is closed when in the lowered position; the electromagnet is connected to the first switch; the first motor is connected to the second motor; 2nd and 3rd
It consists of a motor drive circuit connected to a power source via a switch, and when the shutter release is operated, the electromagnet is operated to raise the mirror, and when the shutter operation is completed, the second motor is operated to lower the mirror and accumulate lifting force. A motor drive device for a single-lens reflex camera configured to be locked in a lowered position and operate the first motor to perform shutter charging and film winding.