JPH01260411A - Photographic operation member controller for camera - Google Patents

Abstract

PURPOSE:To simplify the device and to reduce the cost by constituting the title controller so that a detection of a rotational position of a driving ring for driving a shutter opening/closing mechanism and a distance adjusting mechanism, and a decision of an original position of this driving ring can be combined and executed by one detecting means. CONSTITUTION:By interlocking with a release operation, a driving ring 16 is brought to return operation to an original position before entering into a photographing operating rotation, enters into the photographing operating rotation after having confirmed the original position, and photographing operating members such as a shutter opening/ closing mechanism, etc. are driven. A rotational position of the driving ring 16 at the time photographing and operating rotation in this case is detected by rotational position detecting means 41, 42, and based on this position detecting signal, an operation end signal of the photographing operating member is outputted by a prescribed timing. On the other hand, confirmation of the original position at the time of release- operating is also executed by the position detecting signal from the rotational position detecting means 41, 42. In such a way, said detection and confirmation can be combined and executed by one detecting means, the device is simplified and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of Application The present invention is directed to the photographing of a camera in which the rotation of a drive ring drives a photographing member drive mechanism such as a shutter opening/closing drive mechanism or a distance adjustment photographing lens drive mechanism. The present invention relates to a member drive control device.

B. Prior Art In this type of photographing member drive control device, rotation of the drive ring is started in response to a release operation. - Generally, a distance ring is integrated with the drive ring, and when the drive ring starts rotating, the distance ring also rotates to drive the photographing lens in the optical axis direction to adjust the photographing distance. The rotational position of the drive ring is detected by a rotational position detection device such as a photo interrupter, and the drive of the distance ring is stopped based on the data measured in advance and the position detection result, and the photographic lens is adjusted to the distance to the subject. The position is set to

On the other hand, after setting the position of the photographic lens, the shutter blade is opened by rotation of the drive ring, and from a certain point when the shutter blade begins to open, a timing time calculated based on the brightness measured in advance is measured, and the shutter blade opens. Closed.

In the photographing member drive control device described above, proper distance adjustment and exposure control cannot be performed unless the drive ring starts driving from the original position, so a home position detection switch is provided separately from the rotational position detection device. The original position is being detected.

C9 Problems to be Solved by the Invention For this reason, a one-rotation position detection device and a home position detection switch are required, and this type of device becomes complicated and costs increase.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a photographing member drive control device for a camera in which the original position of the drive ring is also detected by a rotational position detection device.

Means for Solving Problem D1 The present invention provides a drive ring that performs rotation for photographing operation from the original position by a drive source and at least rotates for return operation to the original position after the photographing operation is completed; a photographing member driving mechanism that drives the photographing member by rotating the photographing operation and stops driving the photographing member in response to a photographing operation end signal; and a position detecting means that detects the rotational position of the drive ring and generates a position detection signal. a determining means for determining whether or not the drive ring is at the original position based on a position detection signal obtained during the return operation; A drive source control means for rotating the drive ring for photographing operation by the drive source when the position is determined, and a photographing member control means for controlling the output timing of the photographing operation end signal based on the position detection signal from the position detection means. By providing this, the above-mentioned problems are solved.

In conjunction with the E0 action release operation, the drive ring returns to the original position before entering the photographing operation opening/rolling, and after confirming the original position, the photographing operation rotation begins, and photographing operation members such as the shutter opening/closing mechanism are driven. Ru. The rotational position of the drive ring during the rotation of the photographing operation is detected by a rotational position detection means, and an operation end signal of the photographing operation member is outputted at a predetermined timing based on this position detection signal. On the other hand, the original position at the time of release operation is also confirmed using the position detection signal from the rotational position detection means. Therefore, one detection means can be used for both purposes, simplifying the device and reducing costs.

F. Embodiment An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7.

FIG. 1 is an overall configuration diagram of a lens shutter opening/closing mechanism and a photographing lens distance adjusting mechanism.

In the figure, a pair of shutter blades 1.2 that perform an exposure operation are arranged so that they partially overlap each other when fully open, and one end of each shutter blade 1, 2 is connected to a shaft 3, 4 of each parallel to each other. It is rotatably supported on the shaft.

A fan-shaped first gear member 5 is rotatably attached to the rotation shaft 3, and opens and closes the shutter blades 1 and 2 to form an exposure opening around the optical axis. The tip of a pin 6 protruding perpendicularly from the side surface of the tooth portion of the first gear member 5 is connected to the shutter blade 1,
They are fitted into elongated holes 1a and 2a (elongated hole 2a is not shown due to the drawing) formed on the pivot portion side of 2. Further, shutter blades 1 and 2 are provided on the tooth side of the first gear member 5.
A spring 7 is connected thereto, and a protruding piece 5a provided at the pivot base of the first gear member 5 in a direction opposite to the teeth abuts against the stopper 8.

The clockwise rotation of the first gear member 5 is restricted to maintain the shutter blades 1 and 2 at the fully open position.

A fan-shaped second gear member 9 that meshes with the first gear member 5 is connected to the shaft 1
It is rotatably supported at 0. One end of the operation pin 11 is fixed in parallel to the shaft 10 to a protruding piece 9a that is provided on the pivot base of the second gear member 9 and protrudes in a direction opposite to the teeth.

The rotation shaft 10 of the second gear member 9 is the armature lever 12
is supported at one end of the armature lever 1;
A substantially middle portion of the armature 2 is rotatably pivoted to the shaft 3, and an armature 13 is fixed to the other end, and the armature 13 faces an electromagnetic device 14 that attracts the armature. Further, a reset spring 15 is connected to the other end of the armature lever 12, which biases the armature lever 12 counterclockwise to bias the armature 13 into contact with the electromagnetic device 14.

The drive ring 16 is used to operate the shutter blades 1 and 2 in the opening direction or in the open direction, and also to drive the distance ring 21 to adjust the distance of the photographing lens, and is rotatable around the optical axis. A gear portion 16a is formed on a part of the outer periphery. A cam 16b that engages with the operation pin 11 of the second gear member 9 is formed adjacent to one end of the gear portion 16a, and a gear 17 rotated by a motor 18 is meshed with the gear portion 16a.

Furthermore, this drive ring 16 has 18 light passing holes 16.
d□ to 16d are drilled, and the light emitting element 41 and the light receiving element 42 constituting the photointerrupter are inserted into this light passage hole 1.
They are arranged opposite to each other with the drive ring 16 interposed therebetween at a portion 6d. Also, the opening is 16di.

A protrusion 16e is provided near the. In addition, hole 16d
Engineering~16d1. is used for distance adjustment.

Hole 16d1. is used as a timing signal for starting the shutter opening operation, and the hole 16d1s is used as a timing signal for reversing the motor 18 after photographing is completed. The number of holes 16d above is 1
The number of holes is not limited to eight, and the number of holes for distance adjustment, the position of holes for timing of shutter control, etc. are not particularly limited to the embodiment.

On the other hand, the distance ring 21, which is rotatably provided around the optical axis, has an arm 21a extending in the optical axis direction.
The distal end of the ylA movable ring 16 engages with the erected 16e, and the distance ring 21 rotates forward and backward in conjunction with the drive ring 16.

The distance ring 21 is always biased counterclockwise by a spring 22.

Due to the rotational force, the arm 21a is rotated against the protrusion 16 of the drive ring 16.
drive ring 1 that is in contact with e and rotates in a counterclockwise direction;
It rotates following the movement of 6. Further, 43 is a stopper, which restricts the clockwise rotation of the drive ring 16 and the distance ring 21 and sets the original position of the drive ring 16. A ratchet 21b is engraved on the outer peripheral surface of the distance ring 2, and the pawl 23a of the stop member 23 engages with the ratchet 21b to stop the distance ring 21 at an arbitrary position.

This stop member 23 is rotatable around a shaft 24,
It is biased clockwise by a spring 25. An armature 23b is fixed to the end opposite to the claw 23a, and the electromagnet device 2
6 is provided, and when the armature 23b is attracted to the electromagnet device 26, the pawl 23a is separated from the ratchet 21b,
The two are made not to mesh. In addition, ratchet 2
When the claw 23a rides on the terminal end 21c of the armature 23b, the armature 23b comes into contact with the electromagnet device 26.

The cylindrical portion 27a of the cam cylinder 27 fits into the inner circumference of the distance ring 21, and the screw 28 attached to the elongated hole 27b is screwed into the threaded hole 21d of the distance ring 21.
and the cam cylinder 27 are integrated. A holding cylinder 29 in which straight grooves 29a to 29c extending in the optical axis direction are formed is fitted into the inner peripheral surface of the cam cylinder 27 in which the cam 27c is formed, and a The photographing lens 30 is fitted. Pins 30a to 30c (reference numeral 30b is not shown) that protrude in the radial direction from the outer circumferential surface of the photographic lens 30 pass through straight grooves 29a to 29c of the holding cylinder 29, and their tips end in contact with the cam 27a of the cam cylinder 27. engage with. Further, the photographing lens 30 is always urged in the direction of protruding the edge by the compression spring 31, and the cam barrel 27 receives this urging force via the cam 21a, so the holder (not shown) is a member that prevents the camera from moving forward. It is restricted.

FIG. 2 shows a control circuit for controlling the motor 18 and electromagnets 14,26. In FIG. 2, the arithmetic control circuit 51 is
This arithmetic control circuit 51 is for controlling the electromagnet devices 14, 26 and the motor 18, and includes a photometry circuit 5 which is activated when the release button (not shown) is pressed halfway.
2 and a distance measuring circuit 53 are connected, and from the photometric circuit 52, brightness information corresponding to the brightness of the subject is sent to the arithmetic control circuit 51.
is input to. Further, from the distance measuring circuit 53, distance information corresponding to the distance to the subject is inputted to the arithmetic control circuit 51. Further, the above-described light receiving element 42 is connected to the input side of the arithmetic control circuit 51, and the arithmetic circuit 51 counts pulses input from the light receiving element 42.

Further, an electromagnet device 14 is provided on the output side of the arithmetic control circuit 51.
．． Electromagnetic drive circuits 54 and 55, which respectively control on/off of the motor 26, and a motor drive circuit 56, which controls the motor 18, are connected, and these are controlled according to a processing procedure described later.

Next, the operation of this embodiment configured as described above will be explained with reference to FIGS. 3 to 7.

FIG. 1 and FIG. The state before operation, in which the second gear member 5°9 and the armature lever 12 fully close the shutter blade 1.2, and the pawl 23a of the stop member 23 rides on the top surface of the ratchet end 21c of the distance ring 21 ( In this state, when the release button (not shown) is pressed halfway, the processing procedure shown in FIG. 3 is executed, and in step S1, the electromagnet device 14. 23b is absorbed and held by the electromagnet @14.26.Next, in step S2, the photometry circuit 52 is enabled and the brightness of the subject is photometered, and further in step S3
, the distance measuring circuit 53 is enabled and measures the distance from the camera body to the subject. These photometric data and distance data are taken into the arithmetic control circuit 51 and subjected to arithmetic processing.

The data is stored as data used for exposure control and distance adjustment control, which will be described later.

Next, in step S4, it is determined whether or not the press is fully pressed, and if the answer is affirmative, a motor reversal command is output to the motor drive circuit 56 in step S5, and the motor 18 is rotated in reverse.

It should be noted that if step S4 is negative, it is determined in step S21 whether or not the button is pressed halfway, and if affirmative, the process returns to step S4, and if negative, the process ends.

The reversal of the motor 18 causes the drive ring 16 to rotate clockwise. When the drive ring 16 is now in its original position, the protrusion 16e engages with the arm 21a of the distance ring 21, as shown in FIG. 1, and the stopper 43 prevents its rotation in the clockwise direction. At this time, the light emitting element 41 and the light receiving element 42 of the photointerrupter are facing each other without separating the drive ring 16, and the light receiving element 42 is outputting a high level signal. Therefore, the timer T1 is started in step S6 after the motor is reversed, and the timer T1 is started in step S7.
It is determined whether the high level signal of the light receiving element 42 continues for a predetermined time Ta or not, and if the high level signal is continuously output for the time Ta or more (see FIG. 7(a)), the drive ring 16 is activated. Assuming that it is in that position, the process advances to step S8.

That is, this timer T1 is started at the rising edge of the pulse from the light receiving element 42 and reset at the falling edge, and when the light from the light emitting element 41 sequentially crosses the holes 16d, the ON time of the pulse is short. The timer T1 is reset before counting the time Ta. Therefore, when the drive ring 16 is not at the original position during the release operation, the light receiving element 42 outputs a high level signal every time the light crosses the hole 16d, and the light receiving element 42 outputs a high level signal every time the light crosses the hole 16d□.
2 directly faces the light emitting element 41 and continuously outputs a high level signal for a period of time Ta or more, step S7 is affirmed in the same way as described above.

In addition, in FIG. 1, the distance ring 2 is
1. Although a counterclockwise rotational force acts on the drive ring 16 via the arm 21a, the drive ring 16 remains stopped due to the holding force of the motor 18.

Therefore, normally, the drive ring 16 is in its original position when the release is operated, but due to aging, etc., the rotation holding force of the motor 18 becomes smaller, and the distance ring 21 may rotate counterclockwise due to the spring force of the spring 22. Conceivable. In this case, since the pawl 23a has fallen into the first tooth of the ratchet 21b and the rotation of the distance ring 21 has been stopped, the drive ring 16 is rotated clockwise by reversing the motor 18 during the release operation. If the original position is determined by performing this rotation (referred to as return operation rotation), the end timing of the distance adjustment operation and the shirt shirt opening/closing operation can be accurately performed.

In step S8, a forward rotation command is output to the motor drive circuit 25, whereby the motor 18 rotates forward. This causes the drive ring 16 to start rotating counterclockwise.

Due to this counterclockwise rotation of the drive ring 16 (this rotation is called photographing operation rotation), each time the light from the light emitting element 41 of the photointerrupter crosses the hole 16d of the drive ring 16, the light receiving element 42 outputs a high level signal. (See FIG. 7(b)). Here, since a ring 21 is integrated into the drive ring 16 and the distance ring 21 also rotates counterclockwise, the cam cylinder 27 also rotates counterclockwise due to the counterclockwise rotation of the distance ring 21. rotate,
The photographing lens 30 engaged with the cam 27c is extended in the optical axis direction (see FIG. 7(Q)).

The distance data stored in the arithmetic control circuit 51 due to the distance measurement calculation described above is converted into the number N of pulses of the photointerrupter and stored, and in step S9, the distance data stored in the arithmetic control circuit 51 is stored.
It is determined whether the count value of the pulses output from is N or not, and when it becomes N, the process advances to step SIO and a release command is output to the electromagnet drive circuit 55. As a result, the armature 23b is released from the electromagnetic device 26, and the spring 2
5, the stop member 23 rotates clockwise, and the pawl 23a engages with the ratchet 21b to stop the rotation of the distance ring 21. As a result, the photographing lens 30 stops at a position corresponding to the measured distance to the subject (see Fig. 7).
c). In addition, in FIG. 7(c), a release command is output to the electromagnet device 26 at the fourth pulse.

Even after the distance ring 21 is prevented from rotating, the drive ring 16
continues to rotate in the counterclockwise direction, and high-level signals are sequentially output from the light-receiving elements 42 and counted. In step Sll, it is determined whether the count value is 17,
If affirmative, the process advances to step S12. In step S12, after the delay Tp shown in FIG. 7(d) has elapsed, a timer T2 is activated to measure the timing Ta for closing the shutter. That is, in this embodiment, the 17th pulse is used as a trigger signal for shutter control, and the shutter blades 1.2 begin to open after a predetermined delay time Tp from the 17th pulse.

When the light receiving element 42 outputs the 17th high level signal, the cam 16 of the drive ring 16 rotates in one counterclockwise direction.
b begins to engage with the operating pin 11 of the second gear member 9, and pushes the operating pin 11 in a direction away from the optical axis along the inclined surface 16b1 of the cam 16b. At this time, since the armature 13 is attracted to the electromagnet device 14, the armature lever 12 does not move, and the second gear member 9 rotates clockwise about the shaft 10. Accordingly, the second gear member 9
The first gear member 5 meshing with the first gear member 5 rotates counterclockwise about the shaft 3 against the biasing force of the closing spring 7. At this time, the pin 6 integrated with the armature lever 12 moves counterclockwise, causing the shutter blades 1 and 2 to rotate in the directions of arrows B and C in FIG. 1 about their respective shafts 3 and 4. As a result, the shutter blades 1 and 2 operate slowly in the opening direction along the inclined surface 16b.

The above mechanical operation appears as the delay time Tp. A flat surface 16b connected to the end of the sloped surface 16b
2 engages with the operation pin 11, the shutter blade 1
, 2 is opened to the maximum.

While the first gear member 5 is rotating counterclockwise,
The closing spring 7 moves the operation pin 11 to the inclined surface 16b of the cam 16b.
Since the armature lever 12 is pressed against the workpiece or flat surface 16b2, the armature lever 12 receives a force that tries to rotate it clockwise as a reaction force, but this rotation is caused by the armature 13 being attracted to the electromagnet device 14. It is prevented by being present.

FIG. 5 shows a state in which the counterclockwise rotation of the drive ring 16 has reached its final end, the flat surface 16b2 of the cam 16b is engaged with the operating pin 11, and the shutter blades 1 and 2 are fully opened.

For example, the state shown in FIG. 5, that is, the shutter blades 1 and 2
When the retiming time Te is measured by the timer T2 in the fully open state, step S13 is affirmed and the process proceeds to step S14, where a shutter close command is output to the electromagnet drive circuit 54, thereby stopping the energization of the electromagnet device 14. When the armature lever 12 stops, the attraction force against the armature 13 is lost, so the armature lever 12 is rotated clockwise around the shaft 3 by the tension spring force of the closing spring 7, as shown in FIG. The gear member 5 also rotates clockwise around the lever 3, and its projection 5a comes into contact with the stopper 8, thereby stopping the clockwise rotation of the first gear member 5. At this position, the shutter blade 1 , 2 are fully closed.

Note that the timing time Te is calculated based on the photometric data and film sensitivity, and the time Te is set in the timer T2. Generally, a table of 1-hour Te and Ev values is provided, and the time Te is determined according to the Ev value determined from photometric data and film sensitivity. In addition, the shutter does not start closing immediately after the release command is output to the electromagnet device 14, but there is a mechanical delay, so the end of time Te and the peak of the shutter opening characteristics are different from each other as shown in FIG. The timing time Te is determined by taking this delay into consideration.

Furthermore, a reset spring 15 is applied to the armature lever 12, and the moment exerted by the reset spring 15 on the armature lever 12 in the counterclockwise direction is
Since the clockwise moment is set to be much weaker than the clockwise moment applied to the armature lever 12 by the closing spring 7, it does not interfere with the closing operation of the shutter.

The above explanation is for the case where the shutter blades 1 and 2 are closed after being fully opened, but when the shutter blades 1 and 2 are in the middle of opening, that is, when the middle part of the inclined surface 16b1 of the cam 16b is engaged with the operating pin 11, fi! (When the power supply to the iM stone device 14 is stopped, the shutter blades 1.2 begin to close from that position, making it possible to programmably adjust the exposure amount.

Then, in step S15, it is determined whether the number of pulses is 18 or not, and if it is affirmative, in step S16, a reverse rotation command is output to the motor drive circuit 56, the motor 18 is reversed, and the drive ring 16 is rotated clockwise ( This rotation is also called return operation rotation). As a result, the armature lever 12 is moved to the first position only by the spring force of the reset spring 15.
The drive ring 16 also rotates clockwise when the armature 13 is returned to the initial position shown in FIGS. Although the pawl 23a of the stop member 23 has fallen into the ratchet 21c, the drive ring 16 rotates without being restrained by the pawl 23a, and when the pawl 23a rides on the top surface of the terminal end 21c of the ratchet 21b, the stop member 23
armature 23b is pressed against electromagnet device 26.

In step S16, the counter is reset together with the above-mentioned motor reverse rotation command. Therefore, when the drive ring 21 returns to its original position, the light receiving element 42 outputs a high level signal every time the light from the light emitting element 41 successively crosses the holes 16dl and 16d. Counting starts again by the signal. In step S17, it is determined whether the count value is 18 or not. When the reverse rotation progresses and the light from the light emitting element 41 passes through the hole 16d and the count value reaches 18, step S17 is affirmed. In the next step S18, the above-mentioned timer T1 is started again, and in step S19, it is determined whether the high level signal from the light receiving element 42 continues for a time Ta or more, and if it is affirmative, the drive ring 16 returns to the original position. It is determined that the motor 18 has been reached, and the motor 18 is stopped in step S20. Note that the time given to the timer T1 in this case may be different from the time Ta immediately after the release operation.

Note that unless the rotational speed of the motor 18 is controlled to be constant under various conditions, the shutter opening characteristics will change, and appropriate exposure will not be obtained for a certain Ev value even if the timing time Te determined by referring to the table is used. It is necessary to supply electricity to the motor 18 through a constant voltage circuit or a constant speed control circuit.

Further, in the above description, the distance is adjusted in the initial operating range of the counterclockwise rotation of the drive ring 16, and the shutter opening/closing control is performed in the subsequent latter operating range. This is particularly effective when using a motor with a In other words, the opening operation of the shutter must be performed within the steady rotation range of the motor to achieve a certain level of accuracy, but distance adjustment does not require such stable rotation. This is because it is possible to start the rotation and then start the rotation of the shirt flap opening/closing control. Alternatively, the distance may be adjusted by rotating the drive ring 16 in one direction, and then the rotation may be reversed to control the opening and closing of the shirt shirt. Further, although the operation of returning to the original position was performed by rotating in the opposite direction to the photographing operation, it may be configured to be performed by rotating in the same direction.

Furthermore, although the operation of returning the drive ring 16 to its original position was performed at the timing of pressing the release button fully, it may also be performed at the timing of pressing the release button halfway, or the operation of returning the drive ring 16 to its original position may be performed at a certain timing after battery replacement. You can do it like this. This is to cope with the possibility that the battery may be removed while the drive ring 16 is in operation.

G0 Effects of the Invention According to the present invention, one detection means is used to detect the rotational position of the drive ring that drives the shutter opening/closing mechanism and the distance adjustment mechanism, and to determine the original position of this drive ring. Contributes to equipment simplification and cost reduction.

[Brief explanation of the drawing]

1 to 7 show an embodiment in which the present invention is applied to a lens shutter camera, and FIG. 1 is an overall configuration diagram of a shutter opening/closing mechanism and a distance adjustment mechanism to which the present invention is applied. FIG. 2 is a block diagram of the control device. FIG. 3 is a flowchart showing the processing procedure. FIG. 4 is a front view of the shutter opening/closing mechanism before operation. FIG. 5 is a front view of the shutter opening/closing mechanism in a state where the shutter blade is opened. FIG. 6 is a front view of the shutter opening/closing mechanism showing the operating state immediately after the shutter blade is closed (before reset). FIGS. 7(a) to 7(d) are timing charts showing the operation timing of each part. 1.2: Shutter blade 3.4: Shaft 5: First gear member 6: Pin
7: Closing spring 8: Stopper 9: Second gear member 10: Shaft
11: Operation pin 12: Armature lever 13: Armature 14: Electromagnetic device 15: Reset spring 16: Drive ring 16a: Gear part 16b: Cam 17: Gear 18: Pinion 21: i Moving 22: Spring 23: Stop Component 26: Electromagnet device 27: Cam cylinder
30: Photographic lens 51: Arithmetic control circuit 52: Photometry circuit

Claims (1)

[Scope of Claims] A drive ring that performs a rotation for a photographing operation from an original position by a drive source and at least performs a rotation for a return operation to the original position after the photographing operation is completed; a photographing member driving mechanism that drives the member and stops driving the photographing operation member in response to a photographing operation end signal; a position detection means that detects the rotational position of the drive ring and generates a position detection signal; and the return operation. and determining means for determining whether or not the drive ring is at the original position based on the position detection signal obtained at the time. drive source control means that drives the drive source in conjunction with a release operation to rotate the drive ring for return operation, and causes the drive source to rotate the drive ring for photographing operation when the original position is determined; A photographing operation member control device for a camera, comprising: photographing member control means for controlling the output timing of the photographing operation end signal based on a position detection signal from the means.