JPS63191135A - Motor driver - Google Patents

Abstract

PURPOSE:To rationally execute auto-focusing control or film rewinding by using a clutch interlocking with the operation of a camera. CONSTITUTION:The driving of a single-lens reflex mechanism is divided into 1st and 2nd driving systems, clutching mechanisms A, B, D are arranged between one driving system out of the 1st and 2nd driving systems to be driven by changing the rotational direction of a built-in motor 1 and the output shaft of the motor 1 and the connection/disconnection of the mechanisms A, B, D is controlled by an operation button. The rotation of the upper output shaft of the motor 1 is transmitted to a film winding mechanism and a shutter charging mechanism through the clutch in a unit A. The forward rotation outputted from the lower output shaft of the motor 1 drives a mirror and an iris through a clutch unit B. The reverse rotation of the motor 1 drives an auto-focusing mechanism and a film winding mechanism. Consequently, auto-focusing control or film winding can be rationally executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention provides - mirror drive and aperture drive of an eye reflex camera;
The present invention relates to a motor drive device that uses a built-in motor to perform shutter charging, film winding and rewinding, etc.

(Prior Art and Problems to be Solved) Recently, motor drive cameras in which a motor is built into the camera have become popular.

The present applicant also uses the forward and reverse rotation of a motor to drive mirrors, apertures, and other objects by rotating in the forward direction.
He proposed a method of charging the shutter and winding the film in the opposite direction (Japanese Patent Application No. 125792/1982).
.

In the above system, each of the upper and lower output shafts of the motor is provided with a ball clutch/ratchet gear, so that only rotation in the negative direction is transmitted.

In this method, a ball clutch is used to prevent transmission of light to the shutter side when driving the mirror and focusing, causing friction due to idle rotation and loss of energy.

The ball clutch mechanism requires a spring that pushes the ball to ensure its operation, but it is difficult to design a ball clutch in a small space.
Assembly was also not easy.

An object of the present invention is to provide a motor drive device that can rationally perform autofocus control and film rewinding by using a clutch that is linked to camera operation.

(Means for Solving the Problems) In order to achieve the above object, the motor drive device according to the present invention first controls the driving of a single-lens reflex mechanism such as shutter charging, film winding and rewinding, and mirror raising drive. and a single-lens reflex camera of the type that is divided into a second drive system and drives each drive system by changing the rotation direction of a built-in motor, a clutch mechanism is provided between the one drive system and the output shaft of the motor, and the clutch mechanism is provided between the one drive system and the output shaft of the motor, The connection/disconnection of the mechanism depends on an operation button, the rotation of one of the motors when the clutch is disengaged drives a first drive system, and the rotation of the other motor when the clutch is engaged drives a second drive system. configured to operate the system.

The first drive system may include a mirror raising drive, and the second drive system may include a drive system for an autofocus device.

The first drive system may include a mirror raising drive, and the second drive system may include a film rewind drive system.

(Example) The present invention will be described in more detail below with reference to the drawings and the like.

FIG. 1 is an exploded perspective view showing in detail the internal structure of an embodiment of a camera according to the present invention.

Before explaining this specific configuration in detail, a block diagram (No. 4) showing an embodiment of the motor drive camera according to the present invention will be explained.
An outline of the embodiment will be explained with reference to a time chart (FIG. 5) showing its operation.

The motor 1 has upper and lower output shafts, and when the motor is viewed from above, the clockwise rotation of the shaft along with the upper and lower output shafts is clockwise (positive), and the counterclockwise rotation is also counterclockwise (reverse). It will be used uniformly as

The rotation of the upper output shaft of the motor 1 is transmitted via the clutch of the unit A to the film winding mechanism and the shutter charging mechanism.

However, this clutch is in a state in which power cannot be transmitted, that is, an OFF state, by operating an operation button related to camera operation control, such as a release button, and is in a power transmitting state, that is, in an ON state, when the shutter operation is completed. A state is formed.

Film winding and shutter charging are performed by rotating the motor 1 in the opposite direction while the clutch is on.

Further, the rotation of the motor 1 in the forward direction and taken out from the lower output shaft drives the mirror and the aperture.

Further, when the motor 1 is rotated in the opposite direction, the autofocus mechanism is operated via the clutch of the unit shown in the fourth figure, and when rewinding is required, a film rewinding mechanism (not shown) is operated.

When this autofocus mechanism is being driven, no power is transmitted to the mirror drive mechanism and the aperture drive mechanism.

When an operating button, such as a release button, is pressed down while film winding and shutter charging are in progress, the clutch of unit A is turned off and motor 1 rotates in the opposite direction.

This rotation is transmitted to the autofocus mechanism via the clutch of the D unit, and adjustments such as extension of the objective lens are performed.

When the autofocus adjustment is completed and the motor 1 is rotated in the normal direction, the mirror is raised and the aperture is driven, and when the mirror has been raised, the shutter is operated.

When the shutter operation is completed, the clutch of the A unit shown in FIG. 4 is connected, the motor 1 is reversely rotated, the film is wound, the shutter is charged, and one cycle of camera operation is completed.

That is, in the camera according to the present invention, one cycle of the camera is rationally performed by combining the clutch operation of the A unit and the forward and reverse rotation of the motor.

Next, the detailed configuration of each part will be explained along with its operation.

FIG. 1 is a developed perspective view showing each unit of an embodiment of a motor drive camera according to the present invention.

FIG. 2 is a partial sectional view of the clutch mechanism.

The A unit in Figure 1 is the upper output shaft 1a of the motor 1 in the diagram.
This unit is connected to the shutter charge and film winding.

The B unit is a mirror drive and aperture drive mechanism connected to the output shaft 1b of the motor 1 on the lower side in the figure, and the C unit is the A,
This is a coordination mechanism unit that interlocks the B unit.

In this embodiment, the A unit is driven by counterclockwise rotation of the motor 1, and the B unit is driven by clockwise rotation.

FIG. 1 shows the state after shutter charging and film winding have been completed and before release.

First, when a release button (not shown) is pressed, the clutch gear 2 shown in FIG. Hold it in the position shown in Figure 2 (B).

As a result, as shown in the figure, it is separated from the gear 5 that transmits the rotational force from the motor 1.

At the same time, a release button (not shown) is turned on and the motor 1 starts rotating counterclockwise.

The rotation of the motor 1 drives the B unit, which is a mirror drive and aperture drive mechanism, via an output shaft 1b (see FIG. 1).

As mentioned above, since the clutch gear 2 is separated from the gear train by the clutch lever 4, the power from the motor 1 is not transmitted to the shutter charge and film winding mechanism.

The rotation of the output shaft 1b is transmitted to the final gear 8 via a reduction gear train.

A friction spring 6 is provided in the middle of the reduction gear train to absorb sudden startup of the motor 1 and overrunning from stopping the motor to stopping rotation.

A ratchet 9 is integrally provided on the final gear 8, and the ratchet 9 rotates counterclockwise.

The mirror lever 10 and the aperture lever 1) are connected to a rotating shaft 12.
It is rotatably mounted on the same axis as the narrowing lever 1)
is subjected to a counterclockwise rotational force by a spring 14.

One end of the aperture lever 1) is interlocked with one end of the mirror lever 10, and the mirror lever 10 is also integral with the automatic aperture lever 1) and rotated counterclockwise, and both levers are connected to the fixing pin 1.
3, the rotational force is regulated.

Furthermore, a ratchet lever 15 is rotatably provided on the mirror lever 10 by a shaft 16, and a clockwise rotational force is applied by a spring 17.

The ratchet lever 15 is engaged with an arbitrary pawl of the ratchet 9 and stopped.

At this time, the tip of the ratchet lever 15 is always on the right side of the straight line connecting the rotation axis of the ratchet 9 and the rotation axis 16 of the ratchet lever 15.

In this state, the clockwise rotation of motor 1 is controlled by ratchet 9.
When d is rotated in the counterclockwise direction, any pawl of the ratchet 9 pushes the ratchet lever 15, and the mirror lever 10, which is integrated with the rotating shaft 16, and the narrowing lever 1) that is interlocked with the mirror lever 10 are moved against the spring 14. and rotate it clockwise.

The tip 1)a of the focusing lever is interlocked with the lens and narrows down the lens by rotating clockwise, and the tip 10a of the mirror lever 10 is the tip 31 of the mirror lifting lever 31 of the C unit.
Press a to raise the mirror.

The tensioning charge lever 18 is rotatably mounted on a rotating shaft 19. A counterclockwise rotational force is applied to this lever 18 by a spring 20, and is regulated by a fixing pin 21.

Further, a tension charge idle lever 23 is rotatably provided on a rotating shaft 22 near the tension charge lever 18. This lever 23 is given a clockwise rotational force by a spring 24, and the tension charge lever 18
Clockwise rotation is restricted by a pin 25 fixed to.

As the motor l rotates clockwise, the gear 7 also rotates clockwise, but the pin 7a installed in the gear 7 pushes the tension charge idle lever 23 against the spring 24, causing the lever 23 to rotate. By simply reciprocating around the shaft 22, the tensioning charge lever 18 remains regulated by the pin 21 without any operation.

This tensioning charge lever 18 works by counterclockwise rotation of the motor 1, which will be explained later.

The mechanical stopping of the narrowing down lever 1) and the mirror lever 10 is achieved when the mirror lever 10 hits the rising portion 28 of the base plate.

Next, the C unit will be explained.

This C unit has a base plate of 50°51 above and below the A unit.
It is attached to the right side of the main plate support 52 that integrates the main plate.

The mirror raising lever 31 is rotatably provided on a rotating shaft 33, and a clockwise rotational force is applied by a spring 34. Its clockwise rotation is restricted by a pin 36.

The idle lever 37 is rotatably provided on a rotating shaft 38, and a counterclockwise rotational force is applied by a spring 39.

The front curtain tension release lever 40 is rotatably provided on a rotating shaft 41 and is applied with clockwise rotational force by a spring 42 .

The tip of the idle lever 37 engages with the rising portion 40c of the leading curtain tension release lever 40, and both levers are in a set state in which they are constrained to each other when the shutter is charged.

Mirror switch S2 switches motor 1 near the completion of mirror raising.
This is a switch to stop the clockwise rotation of the
The switch S4 is a switch for generating a trigger signal which is a signal for starting the front curtain of the shutter.

To rotate the mirror lever 10 of the B unit in the clockwise direction, press the lower end 31a of the mirror raising lever 31 with its tip 10a and rotate it counterclockwise against the spring 34.
A mirror (not shown) is raised at the upper end 31b.

Another upper end 31c of the mirror raising lever 31 is connected to one end 3 of the idle lever 37 when the mirror has almost finished raising.
-Press 73 and rotate it clockwise.

When the idle lever 37 rotates clockwise, the leading curtain tension release lever 40 and its binding are released, and the leading curtain tension release lever 40 starts rotating clockwise by the spring 42.

To rotate the front curtain tension release lever 40, first press the mirror switch S.
Turn this off in conjunction with 2. Further, the tip 40b rotates the front curtain tension lever 54 of the A unit counterclockwise, releases the front curtain tension 55 and its binding, and starts the front curtain.

Next, the operation of the A unit will be explained.

After the leading curtain starts running, the above-mentioned trigger switch S
4 and the timing circuit works, the rear curtain also starts running.

That is, when the shutter charging is completed, the notch of the trailing curtain tensioning cam 62, which is integrated with the trailing gear 61 that is linked to the trailing curtain, fits into the tip of the trailing curtain tensioning lever 63, and the other end of the trailing curtain tensioning lever 63 engages the movable piece 64. The rear curtain was in contact with the shutter magnet 69 by the spring 65, and the movement of the rear curtain was prevented by the attraction of the magnet, but the current to the shutter magnet 69 was cut off by the trigger switch S4 and the time setting circuit, and the rear curtain became self-blade. Start running.

Immediately before the trailing curtain completes its travel, the pin 61b of the trailing curtain gear 61 interlocked with the trailing curtain moves to one end 66 of the one-turn limit idle lever 66.
b against the spring 67, rotate this one-turn limit idle lever 66 clockwise, and push the pin 68a planted on the one-turn limit lever 68 at the other end 66a into the spring 96.
, and rotate the one-turn limit lever 68 counterclockwise to release the connection with the one-turn limit plate 70.

Further, the aforementioned clutch lever 4 is rotated clockwise against the spring 4a using the portion 68b of the one-rotation limit lever 68 to release the limit on the clutch gear 2.

At the same time, switch S1 is switched. When the changeover switch S1 is switched in conjunction with the rear curtain, the motor 1 starts rotating counterclockwise.

At this time, when the photographer is pressing the operation button, the release switch SO is turned on, and the motor 1 does not rotate due to a circuit not shown, and the motor 1 does not start until the operator releases the operation button. Rotate counterclockwise.

Due to this counterclockwise rotation, the gear train of the B unit rotates in the opposite direction, and the ratchet 9 starts rotating clockwise, so that the ratchet lever 15 is no longer able to support the mirror lever 10. , mirror lever 10, and aperture lever 1) are rotated counterclockwise by a spring 14 and stopped at a fixed position by a pin 13.

When these levers rotate counterclockwise, the mirror lever 31 of the C unit also rotates clockwise by the spring 34 and stops at the fixed position, and the mirror (not shown) is also lowered by the mirror restoring spring to return to the original fixed position. to return to. These movements are completed by an initial counterclockwise movement of motor 1.

Furthermore, since the gear 7 makes at least one rotation in the counterclockwise direction during this reverse rotation, the pin 7a planted therein enters a portion of the taper of the tension charge idle lever 23 and pushes this lever up.

When the tension charge idle lever 23 is pushed up,
The tensioning charge lever 18 integrated with this rotating shaft 22 is connected to the shaft 1.
9 as a rotation axis, and its tip 18a pushes the lower end 40a of the leading curtain tension release lever 40 of the C unit, and rotates it counterclockwise against the spring 42.
The idle lever 37 is caught by the upper rising portion 40c, and the leading curtain tension release lever 40 is in a closed state.

At the same time as the B unit operates, the motor 1 rotates on the output shaft 1a.
The clutch tooth N2 is transmitted to the gear 5 of the A unit through
Since the gear 5 is receiving an upward force from the spring 3, the gear 5
Due to the rotation of gear 5.2, it meshes with the peaks and valleys of gear 2.
The clutch gear 2 also begins to rotate and, through the gear train, performs shutter charging and film winding.

A gear 71 in this gear train is a friction gear that absorbs a sudden start-up of the motor 1 and an overrunning until the motor stops rotating due to power cutoff.

Film winding is performed by interlocking with a spool gear (not shown) in the middle of the reduction gear train 72, rotating the spool (not shown) via a spool friction spring, and further interlocking with a sprocket gear (not shown), rotating the sprocket. It is done by

The reduction gear train 72 is transmitted to a one-rotation gear 73 that is restricted from one rotation at a one-rotation shaft 77 . The single rotation gear 73 rotates clockwise and drives the shutter charge mechanism via the sector gear 74.

At this time, the sector gear 74 also rotates once, so that the position of the missing tooth is always in a fixed position after winding is completed.

Furthermore, the one-rotation gear 73 rotates the one-rotation limiting plate 70 that is integrated therewith. When the limit plate 70 rotates once clockwise, the rotation limit lever 68 is attached to the notch by the spring 9.
6 to mechanically limit this rotation.

The one-rotation limit lever 68 simultaneously switches the switch S1, and the rotation of the motor 1 is stopped by a control circuit to be described later.

Next, the shutter charge driven via the sector gear 74 will be explained.

A pinion gear 58 fixed to a leading shaft integral with the leading curtain winding drum 80 is connected to the leading curtain gear 60, and a pinion gear 59 fixed to a trailing shaft integral with the trailing curtain winding drum 81 is connected to the trailing curtain shaft. It is connected to gear 61.

There is a return gear 75 below the leading gear 60 and the trailing gear 61, and a counterclockwise rotational force is applied by a return spring (not shown), and the gear is always stopped at a fixed position by a projection (not shown). ing.

When the sector gear 74 rotates counterclockwise from the home position and rotates by a certain angle, it engages with the return gear 75 and rotates the return gear 75 clockwise against a return spring (not shown).

When the return gear 75 rotates, the pin 75a set on the return gear 75 pushes the downward-facing pin (not shown) of the front curtain gear 60, pushes the front curtain gear 60 around, and winds up the front curtain.

Further, the upward-facing bin (not shown) of the leading gear 60 pushes the lower bin (not shown) of the trailing gear 61 to rotate the trailing gear 61 and wind up the trailing curtain.

Furthermore, after the leading curtain tensioning lever 55 rides over the leading curtain tensioning lever 54 by the amount of overcharge, the return gear 75 and the sector gear 74 are disengaged and returned to the original position by the return spring.

At the same time, the front curtain gear 60 and the rear curtain gear 61 also return by an amount corresponding to the overcharge, but since the front curtain tension 55 is set by the front curtain tension lever 54, they are in a stopped state and the shutter charge is Complete.

In this state, the winding continues, and when the remaining winding is completed, the one-turn limiting lever 68 jumps into the one-turn limiting plate 70, and the winding is completed.

Next, driving and control of the mechanism according to the above configuration will be explained with reference to FIG.

FIG. 3 is a circuit diagram showing a control circuit for the motor 1. As shown in FIG.

This circuit works as long as the film is always being wound.
I am trying to finish the operation.

When the main switch S3 is turned on in this state, the input terminal of the Nant gate N1 of the flip-flop circuit (hereinafter referred to as FF) is set to 0. Since the terminal voltage of the capacitor C is initially zero, that is, L, the output of N1 is H, and the output of N2 is forms the state of L.

When the release switch So is turned on, the input of N2 becomes L, so the output of N1 is switched from H to L. Therefore, the output of the inverter In becomes H, so the transistor T1 is turned on, and the base current is supplied to the transistor T2 via R4, turning on the transistor T2. The switch S1 is connected to the {circle around (2)} side because winding has been completed, and current flows through the motor 1 in the direction indicated by the arrow a, causing the motor 1 to rotate in the direction of raising the mirror.

It should be noted that when the switch S1 is on the ■ side, the base of the transistor T3 is connected to zero via R6, so the transistor T3 is off.

When the mirror lift is completed, the tension release lever 40 (see FIG. 1) moves clockwise to turn on the switch S2. Therefore, the base side of the transistor T1 becomes L, the transistor T1 is turned off, and therefore the transistor T2 is also turned off, so that no current is supplied to the motor 1 and the motor 1 stops.

By moving the tension release lever 40 (see Fig. 1), the tension of the front curtain is released, the front curtain of the shutter runs, then the rear curtain runs, and when the running is finished, the switch S1 is set to the third
It can be switched to the side shown in the figure ■.

As a result, the base of the transistor T3 is connected to the positive side of the battery E via the resistor R6, so the transistor T3 is turned on, and a current is supplied to the motor 1 in the direction indicated by the arrow A, which is different from the mirror rising direction. Start rotating in the opposite direction.

At this time, since S2 is in the on state, the transistor T
2 is off.

When T3 is turned on, the input of N1 of the FF becomes L through the resistor R4, so the output of N1 becomes H, and the FF is reset.

When the motor 1 rotates in the winding direction, the mirror is first lowered in the initial stage of winding.

At the same time, in FIG. 1, since the gear 7 makes at least one rotation in the counterclockwise direction, the bottle 7a installed therein is
enters a tapered portion of the tension charge idle lever 23 and pushes this lever up.

When the tension charge idle lever 23 is pushed up,
The tension charge lever 18, which is integrated with the rotating shaft 22, rotates clockwise, and its tip is connected to the leading curtain tension release lever 40.
Press the bottom end of the idle lever 3 and rotate it counterclockwise.
7 to set the front curtain tension release lever 40.

At this point switch S2 is turned off. Therefore, the base of the transistor T1 is opened, but since the FF has been reset, the inverter In outputs an output, and the transistors T1 and T2 remain off.

When the winding is completed, the switch S1 returns to the state (2), but since the transistor T2 is turned off, no current flows through the motor and the motor stops.

When the switch S1 is changed from ■ to ■, the transistor T3 is turned off and the input of N1 returns to H.

Therefore, if the release switch So continues to be in the on state, the output of the FF is immediately switched from low to high as soon as the switching of Sl is completed, and the rotation operation of raising the mirror is started.

However, if the release switch So is turned off before the winding is completed, the FF is reset and returns to the state before the start, and the motor stops, forming the end state of one operation.

In the embodiment described above, the lens focusing mechanism or the film rewinding mechanism, which is a mechanism that is not affected by the rotation of the mirror driving direction, is connected to the motor 1.
Rotation in the opposite direction taken from the lower axis of can be carried out at each required time.

(Effects of the Invention) According to the present invention described in detail above, there is provided a motor drive device that can rationally perform autofocus control and film rewinding by using a clutch that is linked to camera operation. can do.

The motor drive device according to the present invention divides the drives of a single-lens reflex mechanism such as shutter charging, film winding and rewinding, and mirror raising drive into a first and second drive system, and each drive system controls the rotation direction of the built-in motor. In a single-lens reflex camera of the type that is driven by changing the clutch, a clutch mechanism is provided between the one drive system and the output shaft of the motor, and the connection and disconnection of the clutch mechanism is made dependent on an operation button, and when the clutch is disconnected, the motor The rotation of one of the motors can drive the first drive system, and the rotation of the other motor when the clutch is engaged can operate the second drive system. The first drive system may include a mirror raising drive, and the second drive system may include a drive system for an autofocus device.

Further, the first drive system may include a mirror raising drive, and the second drive system may include a film rewind drive system.

The embodiments described in detail above can be modified in various ways within the scope of the present invention, and which direction of rotation of the motor is transmitted to which drive system can be selected as appropriate in the design. be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a developed perspective view of each unit of an embodiment of a motor drive device according to the present invention. FIG. 2 is a partial cross-sectional view of the clutch mechanism. FIG. 3 is a circuit diagram showing a motor control circuit. FIG. 4 is a block diagram showing an embodiment of a motor drive device according to the present invention. FIG. 5 is an explanatory diagram showing the operation of the motor drive device shown in FIG. 4. 1...Motor 2...Clutch gear 3...
・Spring 4...Clutch lever 4a...Clutch lever spring 5...Gear 6...Friction spring 7
...Gear 8...Final gear 9...Ratchet 10...Mirror lever 1)...Narrow down lever 12...Rotary shaft 13...Fixing pin
14... Spring 15... Ratchet lever 16... Shaft 17... Spring 18... Tightening charge lever 19... Rotating shaft 20... Spring 2... Fixed pin 22...・Rotating shaft 23...Tight charge idle lever 24...Spring 25...Pin 28...Rising portion of base plate 31...Mirror lift lever 33...Rotating shaft 34...Spring 36. ... Pin 37 ... Idle lever 38 ... Rotating shaft 39 ... Spring 40 ... Lead curtain tension release lever 41 ... Rotating shaft 42 ... Spring 50.51.
...Main plate 52...Strut 54...Front curtain tensioning lever 55...Front curtain tensioning 58...Pinion gear 60
...Front curtain gear 61...Rear curtain gear 62...
Trailing curtain tensioning cam 63... Trailing curtain tensioning lever 64... Movable piece 65... Spring 66... Idle lever 67... Spring 68... One rotation limit lever 69... Shutter magnet 70...One rotation limit plate 71...Flixiran [72...Reduction gear train 73...One rotation gear 74...
... Sector gear 75 ... Return gear 77 ... Rotating shaft 80 ... Leading curtain winding drum 81 ... Trailing curtain winding drum 96 ... Spring So ... Release switch S1 ... Switching Switch S2...Mirror switch S4...Trigger switch S3...Main switch Patent applicant Kyocera Co., Ltd. Agent Patent attorney I) B Groove piece 2゜3 Figure 24

Claims (3)

[Claims] (1) The driving of the SLR mechanism, such as shutter charging, film winding and rewinding, and mirror raising drive, is divided into a first and second drive system, and each drive system is driven by changing the rotation direction of the built-in motor. In a type of single-lens reflex camera, a clutch mechanism is provided between the one drive system and the output shaft of the motor, and the clutch mechanism is connected and disconnected depending on an operation button, and when the clutch is disconnected, one of the motors rotates. A motor drive device characterized in that the first drive system is driven and the second drive system is operated by rotation of the other motor of the motor when the clutch is engaged. (2) the first drive system includes a mirror raising drive;
2. The motor drive device according to claim 1, wherein the second drive system includes a drive system for an autofocus device. (3) the first drive system includes a mirror raising drive;
The motor drive device according to claim 1, wherein the second drive system includes a film rewind drive system.