JPS5843434A - Stepping mechanism for automatic focusing utilizing driving power of electromagnetic drive shutter - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of the setting mechanism of AF controlling by permitting driving of both of automatic focusing control and shutter control by using an electromagnetic device having a moving coil. CONSTITUTION:In a camera wherein a shutter exposure mechanism and an automatic focusing mechanism are controlled by a rotor 36 having a moving coil 37 provided in a magnetic field, a rotor 36 is turned like pulses by flowing pulse electric currents to a moving coil 37, and an AF control lever 8 of an automatic focusing (AF) mechanism is stepped when the pawl 21a of a clamping lever 21 hooks the next pawl of the position pawls 8a of the AF control lever 8. A distance lever 22 is moved to a correct photographing position by the lever 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an autofocus stepping mechanism for a camera in which the shutter opening/closing operation is performed by electromagnetic drive, and the autofocus mechanism is preset using an electromagnetic mechanism for driving the shutter. It is something.

The electromagnetic drive shutter uses an electromagnetic drive mechanism equipped with a moving coil printed on a lightweight substrate to open and close the shutter blades.The electromagnetic drive shutter has an extremely simple linked mechanism that not only allows the shutter to open and close, but also has a sub-diaphragm that is linked to the operation of the shutter blades. Accurate exposure control is achieved by adding an exposure control mechanism having
32. Furthermore, a device that uses two electromagnets to perform operations for image control and autofocus (AP) has been known since it was published in Japanese Patent Application Laid-Open No. 54-99624.

In devices using such conventional methods, the exposure control and human control are performed by repeatedly releasing and attracting the armature using an electromagnet. It is controlled by an electromagnet and released by an electromagnet. In order to perform the control, an accurate position detection means for the insect control lever is required, and this is a more complicated mechanism than the shutter control mechanism. APs that tend to become
A control mechanism that also performs sub-control shutter exposure control,
A low-cost micro and shutter drive mechanism that uses electromagnetic drive and uses information in accordance with the photographing distance on the micro control lever to perform the movement! The purpose is to That is, in the present invention, a moving coil that moves in response to several AP sub-control pulses is provided, and the A! carried out by a control lever,
This person again! By configuring the lever so that it is reset by the return operation of the shutter button, it is possible to create a bug device capable of pre-distance measurement.

The present invention will be described in detail below with reference to the drawings. Figure 0 is a schematic diagram of a shutter showing an embodiment of the present invention, and is shown in plan for the sake of easy understanding of the mechanism. In the figure, l is the release button of the shutter, and the lock lever 2 is crimped while being biased by a lock lever (4) so that the lock lever 2 can rotate counterclockwise around the axis 3. It is rotatable and rotates while charging the insect control lever spring gate attached to the insect control lever 8 with the set lever lever glue, and when the set lever lever 10 moves downward by pressing the release button 1, it reacts according to the movement. Knee turn clockwise.The set dowel 10 is crimped by the shutter release button 1 and moves integrally with it.11 starts the lens barrel, and when 2<, the shaft 12
It is rotatable around , and is biased clockwise by a starting lever spring 130 force.

The lens barrel starting lever 11 is -・The barrel lever [4 is the lens barrel and 7 (,,,
(The lens barrel start lever 16 is caulked to the shutter release button l, and the shutter release button is fully pressed down until it starts moving to the left.) When you move to the stroke of 2,!
The tension with the lens barrel lever 14 is released. L
] is the wind-up switch, and when the shutter release button 1 is in the key position (without pressing the shutter button), the motor for feeding the film is activated. 19 is the shutter release switch. This is a guide bin for advancing the release button.

The insect control lever 8 is a lever that is guided by a guide bin 20 and can move in a straight line.

An interlocking bottle 8.゛ is planted in the insect control lever 8,
The movement of the insect control lever 8 is enabled in conjunction with the movement of the set lever 5 which is linked to the depression of the shutter release button 1, and when the insect control lever 8 is traveling and moving to the left, the shutter release button The force of the set lever 5, which rotates in the direction of the trout meter due to the backward movement of the point 1, causes the force of the set lever 5 to move back to the set position. "Mu1 control"
The bar 8- has amisb, and the shutter release button 1 only has the stroke addressed to the location (i.e. the first stroke).
Even if you push it in, for example, the tension lever 2 may be locked due to rumors that the battery is running out.
1 is not performed) and the lock lever 2 is moved to the set position "A'm'M", the prohibition pawl 8b engages with /l' (2m) of the lock lever 2 to prevent the shutter release button from moving back. In addition, the insect control lever 8 has a cam part 8C, and the dowel 2-3 on the distance measuring lever 22 to which the light emitting element (InVD) for auto 7 orcus is fixed has a cam part 8C. A lever 26i, which is integrated with the lens barrel 25 to which the photographic lens 24 is fixed, is attached to the - of the cam portion 8C.
A step cam portion 8d is provided which acts as a stopper for the dowel 27 and measures the distance. The distance measuring lever 22 is rotatable about a shaft 28, and is biased with clockwise rotational force by a distance measuring lever spring 29 made of a weak spring.

The light projected from the light projecting element is collected by the light projecting lens 30, and the reflected light from the object is collected by the light receiving lens 31 and enters the light receiving element 32, where it is converted into an electrical signal.

The lens barrel lever 14 has a lens barrel lever interlocking switch 33, and by pressing the shutter release button l deeply, the second
When it moves to the stroke, it is released via the lens barrel starting lever 11, and the cam 14 is released from the off position a little later than the timing when the dowel 34 on the straight lever moves together with the lens barrel 25 by the force of the straight lever spring 35. When the shutter release button 1 moves back, the motor is energized to perform film feeding, etc.

There is a charge part on the an lever 14, although no one is shown in the figure.
In conjunction with film feeding, the cam 14a moves while charging the straight lever spring 35 of the straight lever 2b, and just before the winding operation ends, the switch to the motor circuit is turned from on to off, and the winding and SS levers are charged. is designed to be completed using inertia.

36 is a rotor for shutter and AP operation, and printed coils 37 are arranged on both sides of a glass epoxy substrate.
It is rotatable around a shaft 38. The rotor 36 receives clockwise rotational force from the rotor spring 39, and the coil 3
By energizing the rotor 7, a Lorentz force is generated between the rotor 7 and the magnetic field 40, and the rotor spring 39 is charged while rotating counterclockwise. 41 is a sector lever which is coaxial with the rotor 36 and can be rotated around a shaft 38, and is rotated by the force of a spring 42.
When the d-6 moves back, the rotor spring 39M moves it back clockwise.

A sector bin 43 is installed in the sector lever 41, and the sector lever 41 rotates a shutter blade 45 about a sector axis 44 to open a part or all of a diaphragm aperture 46 for exposure.

The tensioning lever 21 is rotatable about a shaft 47 and receives a clockwise rotational force from a weak spring tensioning lever spring 48.

When the print coil 37 is energized for a short period of time, the rotor 36 rotates counterclockwise and hits the tension lever 21, and the claw 21m of the tension lever catches the claw next to the position claw 8a of the control lever 8. , the par 8 is designed to advance in accordance with the number of times of energization.

Since this energization is short and the rotor 36 moves quickly, the sector lever 41 cannot follow it due to the air viscosity of the shutter blades 45 and the like, so the shutter does not open. In addition, the determination section 41m of the sector lever 41 sounds, and it is caught by the first stroke determination section 14b of the lens barrel lever 14, making it mechanically impossible to open.

During the second stroke, the lens barrel start lever 11 moves and the straight forward lever 2 moves.
6 moves upward, dowel 2-7 moves to control lever 8
In this state, the moving coil 37 is caught on the step cam part 8d to prevent the leftward movement of the M1 restraining lever 8.
When electricity is applied for exposure control to the tension lever 21if
Even after i rotations, the 5ν control lever does not move. This temporary first stroke determination section 14b is the determination section 41m.
is retreating from the stroke. Due to the relatively long energization at this time, the sector lever 41 follows the rotation of the p-type 36.
The shutter blade 45 is also rotated, and the shutter blade 45 is opened to perform exposure.

Next, the operation of the illustrated device will be explained step by step. The control lever 8 becomes movable. At this point, a distance measurement switch (not shown) that is linked to the stroke of the shutter release button l enters and receives the reflected light from the subject of the light emitting element on the distance measurement lever 22, and the output of the light element is activated. A short glus-like current is applied to the moving coil 37 until it reaches its peak, and this causes the rotor 36 to rotate in a pulsed manner and the tensioning lever 2
1, the pawl 21m moves one position mold 8m one after another, the insect control lever 8 steps leftward, and the lens #exit position is set. When the shutter release button 1 is returned to its original position, the shutter lever 5 rotates clockwise, and the insect control lever 8 is pushed to the right and restored to the set position. Therefore, by lightly pressing shutter release button 1 -
Prefocusing is performed in the first stroke, and by returning the shutter rellino button 1 to its original position, the
Orcus will be reset.

(2) After the lens extension control lever has moved to the predetermined position corresponding to the shooting distance, press the shutter release button
And,,'5. Lens barrel starting part, 16°□□ka280, O1
□□'1L□, ka□.

The lever 11 is disengaged from the lens barrel lever 14, and the lens barrel lever 14 moves to the left.As the cam 14m retreats, the straight lever 26 moves together with the photographing lens integrated with it, and moves forward. The dowel 2'7 of the straight lever 26 engages with the stepped cam portion 8d of the insect control lever 8, which is moving, and is stopped. By this movement of the lens barrel lever 14~, the current applied to the moving film 27 is switched from a control mode in which a short pulse is output for the purpose of exposure control to an exposure control mode in which a relatively long current is applied for exposure control. A switch (not shown) is operated for this purpose. At this stage, the photographing lens has completed its movement, and the next exposure control operation is performed.

(When the 8131 first control operation mode changeover switch switches from the insect control mode to the exposure control mode, the moving coil 37 is continuously energized.': In the exposure control mode, the energization is for a relatively long time. ,aao-ga 6゜.,Iwa,,A,Ya.

The lever 41 moves and moves the shutter blade 45 to perform an exposure operation. When a predetermined exposure operation is performed, the power to the moving coil 37' is cut off, and the rotor 36 is rotated clockwise by the force of the rotor spring 39, which also rotates the sector lever 41 and rotates the shutter blade 45. Move the shutter to close it.

At this time, the rotor 36 also rotates the tensioning lever 21. Since the step cam portion 8d of the lever 8 is engaged with the dowel 27, the lever 8 cannot move to the left. There is no chance that the setting position will be incorrect.

(4) Return operation When you release the shutter release button 1 after shooting, the shutter release button 1 is returned to its original position by the force of the shutter release button spring 18, and the winding switch 17 is turned on to feed the film. send. Along with film feeding,
A charge mechanism (not shown) opens the lens barrel lever 14 just before the interlocking switch 33 is raised, and the electric current to the motor is finished, and the camera is set to the set state by the inertial force of the motor.

(5) Operation when the battery runs out The camera of the present invention releases the lens barrel lever 14 using a mechanical interlocking mechanism, so when the shutter release button returns, the next film feed can be started even if the shutter does not operate due to a dead battery or the like. There was a drawback that the transfer was carried out. In the device of the present invention, when the shutter release button 1 moves back, if the insect control lever 8 is not moving, the lock lever 2 engages with the prohibition pawl 8b, making it impossible for the shutter release button 1 to return. ing. That is, when the moving fill 37 is not sufficiently energized (such as when the wire is broken or the battery voltage is exhausted), the tension lever 21 does not move.
Since the lever control lever is held in the set position, the return of the shutter release and button 1 is thereby prevented. is the electric current that can be activated by one signal.
- An electromagnetic device having a moving coil is used as a mechanical transducer element, so that both autofocus control and chassis-me control can be performed in a meandering manner. By supplying current and setting the position of the A1 set mechanism step by step, M! The control setting mechanism can be easily adjusted, and by providing a simple mechanism for an electromagnetic drive shutter, an electromagnetic shutter camera with unevenness can be constructed easily and at low cost. Note that since the distance can be set by activating only the M1 control using the first stroke of the shutter button, it is possible to perform a prefocus operation and to restore this with a weak force. Therefore, it has many features such as being able to reset the prefocus by the return operation of the release button, and is particularly effective when creating a simple configuration of an O□′-゛Orcus camera. .

[Brief explanation of the drawing]

The figure is a mtttt* diagram showing an embodiment of an electromagnetic drive shutter having an autofocus stepping mechanism according to the present invention. 1... Shutter release button, 2... P release button, 5... Seven release button, 8... M! control lever, 11
... Cavity starting lever, 14... Lens barrel lever, 17... Winding up switch, 21... Tightening lever, 22... Distance measuring lever, 24... Photographing lens, 30... floodlight lens,
31... Light receiving lens. 32... Light receiving element, 33... Interlocking switch, M...
·motor. 36... Rotor, 37... Moving coil, 4
0...Magnetic field. 41... Sector lever, 45... Shutter blade, 46
...Aperture aperture. Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] (1) It has a moving coil that is placed in a magnetic field.
In a camera in which a shutter exposure mechanism and an autofocus mechanism are controlled by a rotor, the rotor is rotated in a pulsed manner by applying a current to the moving coil in conjunction with the shutter-tongue release of the camera, and the autofocus mechanism is controlled by a rotor. comprising means for advancing the cape control member of the mechanism;
The distance mechanism is moved to a proper shooting position by the control member (2. In the device described in claim H(1), the control member of the autofocus mechanism is moved by the return operation of the shutter button. It is characterized by having a return means for resetting to the initial position in conjunction with