JPH05265077A - Motor-driven shutter - Google Patents

Abstract

PURPOSE:To realize automatic focusing in addition to the control of the driving of a motor-driven shutter only by a single motor and to accelerate the action timing of the motor-driven shutter. CONSTITUTION:In the motor-driven shutter provided with a photographing lens, a diaphragm blade and a shutter blade 10a which are controlled by the single motor 4, a driving member 1 actuated by the motor 4, a diaphragm member 5 which sets a distance ring setting the photographing lens and the diaphragm blade to a prescribed value through the driving member 1 by the normal rotation of the motor 4, a closing member 22 which actuates the diaphragm blade to a closing position and the shutter blade 10a pressed in an opening direction are provided. By the driving member 1, the distance ring is actuated and the photographing lens is set to be the prescribed value. Simultaneously, a prescribed diaphragm is set by the reverse rotating action of the motor 4 in the setting process of the diaphragm and the blade 10a is opened. By the continuous action of the motor 4, the lock of the closing member 22 is released and the diaphragm blade is closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-driven shutter used in an auto-focus and auto-exposure type camera, and more particularly, the operation of a shutter blade and an aperture blade is controlled by a single motor after performing an auto-focus adjustment operation. The present invention relates to a motor-driven shutter for automatic exposure.

[0002]

2. Description of the Related Art Conventionally, as such a motor-driven shutter, there is a shutter device disclosed in, for example, Japanese Unexamined Patent Publication No. 3-89331. This shutter device provides a shutter device that controls an aperture and a shutter speed by using two sets of sectors that are operated by one motor, and that also operates a photographing lens. That is, the aperture value is set while the motor moves by a predetermined stroke, the photographing lens is then moved to the set value, and then the shutter is operated. Different actuators are operated for setting the aperture value and the taking lens during that time.

[0003]

However, in such a conventional motor drive shutter, it is assumed that the stepping motor as the drive control means always moves by a predetermined stroke, and a desired aperture value is set during that time. Also, since the next movement of the taking lens is started after the operation of the predetermined stroke, the start of the shutter operation is delayed, and there is a problem that the camera is weak against a shutter chance. Then, this invention makes it a subject to solve the said problem.

[0004]

In order to solve the above problems, the present invention provides a motor having a single motor whose forward / reverse rotation is controlled, and a taking lens, diaphragm blades and shutter blades which are controlled by the motor. In the drive shutter, a drive member operated by the motor, a distance member that sets the photographing lens to a predetermined value via the drive member by normal rotation of the motor, and a diaphragm member that sets the diaphragm blades to a predetermined value. A connecting member that connects the diaphragm member to the drive member, a closing member that locks the diaphragm blade to a closing position to lock the diaphragm blade, and a shutter that locks in the closing position and is biased in the opening direction. A blade, the drive member connects the connecting member to the diaphragm member in response to a signal for setting the distance member to a predetermined value, and sets a predetermined diaphragm, Solve serial locking and releasing the shutter blade, it is an arrangement for closing the aperture leaf by solving the locking of the closure member by the operation of subsequent said motor.

[0005]

According to the motor-driven shutter having such a structure, since the motor-driven shutter can be quickly and efficiently driven and controlled by only a single motor, the structure and control of the motor-driven shutter can be simplified. As a result, it is possible to reduce the size of the shutter and reduce the cost, which is resistant to shutter chances.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing an embodiment of a motor-driven shutter according to the present invention. 1 and 2, the home switch HS is a normally closed contact composed of a movable contact h1 and a fixed contact h2 as an operation start confirmation signal output means, and the movable contact h1 is a pin 6 provided on the distance ring 6.
The tip is supported by d. A spring 6c is provided between the pin 6d and the substrate 2a, and the elasticity of the spring 6c constantly urges the distance ring 6 in the clockwise direction. When the release button SW is not pressed, the distance ring 6 is at the home position as shown in FIG. 1, and the home switch HS is opened by the pin 6d. When the release button SW shown in FIG. 2 is pressed, the sequence of power-on and automatic focus operation (lens drive) is executed in the first stroke, and the exposure operation and film winding operation are executed in the second stroke.

A step motor 4 for driving the drive ring 1.
The pinion 11a fixed to one end of the wheel rotates the ratchet wheel 7 clockwise through the drive ring 1 and the distance ring 6 by the reverse rotation of the step motor 4 and pushes up the locking lever 8. When the electromagnet 9 is energized at that time,
The locking lever 8 is held at a position where the tip of the locking lever 8 does not lock the teeth of the ratchet wheel 7. Next, the step motor 4 shifts to the normal rotation for the focusing operation, and transmits this rotation to the drive ring 1 arranged on the substrate 2 via the pinion 11a fixed to the rotation transmission shaft, and the spring 6c causes this rotation. The following distance ring 6 is rotated clockwise in the figure. When the distance ring 6 rotates clockwise in the figure, the home switch HS is opened.
Of the movable contact h1 of the fixed pin h2 by the movement of the pin 6d.
It contacts and closes.

In the home switch HS, the movable contact h1 is connected to the reference potential point, and the fixed contact h2 is connected to the input side of the forward / reverse pulse sending section 15 of the control circuit CPU. The number of pulses from the forward / reverse pulse output unit 15 is determined by the shutter calculation unit 17 and the focus adjustment calculation unit 18 of the control circuit CPU. The forward / reverse pulse sending unit 15 cannot send the phase pulse to the step motor drive circuit 4a unless the home switch HS is closed. The forward / reverse pulse sending unit 15, the shutter calculation unit 17, the focus adjustment calculation unit 18, and the AF magnet sequence unit 16 are controlled by a program and data contained in a main control unit 19 including a ROM and a RAM. When the AF magnet sequence unit 16 is controlled by the main control unit 19, sequence control of three reverse rotation pulses, operation of the electromagnet 9, and seven forward rotation pulses is performed.

In the camera having the above structure, the operation sequence shown in the flowchart of FIG. 3 is executed by pressing the release button SW shown in FIG. When the release button SW is operated, the power is turned on at (F1) and the power is held (F2). The distance is measured by the distance measuring unit 18a shown in FIG. 2 (F3), and the focus adjustment calculation unit 18 calculates the focus adjustment. The reverse rotation pulse is sent from the AF magnet sequence unit 16 to the step motor 4 three times via the forward / reverse rotation pulse sending unit 15 and the step motor drive circuit 4a (F
Four ). When the reverse rotation pulse is sent to the step motor 4 three times, the ratchet wheel 7 rotates clockwise and pushes up the locking lever 8. In this state, the AF magnet sequence unit 16
Outputs a signal for causing the electromagnet 9 to perform the attraction operation (F
Five ). The operation of the electromagnet 9 holds the locking lever 8 at a position where the tip of the locking lever 8 is not locked to the teeth of the ratchet wheel 7. Under the control of the AF magnet sequence unit 16, the forward / reverse rotation pulse sending unit 15 outputs the forward rotation pulse to the step motor 4 seven times to drive the lens (F6).

With this lens drive, home switch HS
Opening and closing of the car is judged (F7). Home switch H
When S is closed, the forward rotation pulse determined by the focus adjustment calculation unit 18 is sent to the step motor 4 via the forward / reverse rotation pulse sending unit 15 (F8). When the lens is driven to a predetermined distance (F9), the attraction operation of the AF magnet is turned off (F10). When the release button SW is pressed down to the second stroke, the brightness of the subject is measured by the photometry unit 17a (F11), and the setting unit 1
Depending on the setting contents of 7b, the shutter calculation unit includes the aperture and speed depending on each mode such as aperture priority, speed priority, subject depth program, moving subject program, etc. including various conditions such as the above measured values and film sensitivity. It is calculated in 17.

Next, an exposure operation is performed (F12), which will be described in detail with reference to the flowchart of FIG. OF of electromagnet 9
After the ratchet wheel 7 is locked by the locking lever 8 by F, when the drive ring 1 is further rotated clockwise by the step motor 4, the distance ring 6 is stopped and the pin 1c is separated from the follow-up of the distance ring 6. Further, since the connecting lever 12 is rotatably supported on the drive ring 1 by the shaft 12a, the projection 6 is stopped by stopping the distance ring 6.
e also stops, and the connecting lever 12 turns to the left along the cam portion 12b around the shaft 12a by its own urging force,
The locking portion 12c engages with the hook portion 13a of the aperture ring 13.

When the drive ring 1 further turns to the right, the cam portion 13b pushes up the pin 5a of the aperture lever 5 while accompanying the aperture ring 13 which is biased by the left turning force. When the motor 4 turns corresponding to a predetermined pulse, the aperture lever 5 turns corresponding to the cam portion 1b, and the open aperture blade (not shown) is set to a predetermined value by the pin 5b (F).
a). More specifically, in FIG. 1, when the drive ring 1 turns to a position slightly past this predetermined value for narrowing and the motor 4 rotates in the reverse direction (Fb), the locking step portion 13d is locked to the protrusion 20c of the setting lever 20. Then, the setting lever 20 is pushed up to the upper left in the figure against the spring 20b. Setting lever 2
0 is biased clockwise by a spring 20b and is given a sliding force to the lower right, and a position where the setting lever 20 is moved by the locking step 13d via the protrusion 20c and the motor 4 is stopped. Corresponds to the aperture setting value (Fc). At this time, the opening diameter is fixed to D as shown by the curve A in FIG. Due to the movement of the setting lever 20 against the spring 20b, the substantially L-shaped opening claw 21 is pushed counterclockwise by the curved portion 21b being pushed by the stepped portion of the setting lever 20, and the curved portion 21a at the lower right in FIG. Unlocks the step 10c of the opening ring 10. As a result, the opening ring 10, which was previously urged in the clockwise direction by the spring (not shown), rapidly swivels in the same direction, and the shutter blade 10a is rotated as shown by the curve B in FIG.
Is rapidly opened from the closed state (Fd).

When a desired exposure time T elapses after the shutter blade 10a is opened (Fg), the temporarily stopped motor 4 turns in the reverse direction again (Fh), and the setting lever 20 resists the spring 20. Slidingly, pushing the curved portion 21b to swivel the open claw 21, and further pushing the pin 23a, the closing claw 2
3 is rotated to the left to release the engagement with the closing lever 22. When this engagement is released, the closing lever 22 is swung rapidly in the counterclockwise direction by the spring 22b, and the protrusion 22d is fixed to the pin 5c.
By pressing to rotate the aperture lever 5 clockwise against the spring 5d, the aperture blades are closed as shown by the curve A in FIG. 5 to complete the exposure (Fi). In this way, the camera exposes the film with the amount of light in the shaded portion with the aperture D and the exposure time T as shown in FIG.

The closing lever 22 has a curved portion 22 at the end of rotation.
The intermediate lever 24 is swung right around the shaft 24a by c, the setting lever 20 is swung counterclockwise via the protrusion 20d, and the protrusion 20c is retracted from the operating range of the locking step 13d. Then, when the motor 4 reversely rotates (F13),
Each member returns to the home position shown in FIG. 1 by the drive ring 1, but the opening ring 10 is pivoted counterclockwise against the spring by the connection (not shown) to close the shutter blades. After that, the protrusion 22e is pushed by the pin 10b, the closing lever 22 pivots clockwise, and the curved portion 22
c is locked by the closing claw 23. Therefore, the diaphragm lever 5 is rotated counterclockwise by the spring 5d to open the diaphragm blade again.

When the exposure operation (F12) is completed in this way, a reverse rotation pulse is sent to the step motor 4 via the forward / reverse rotation pulse sending section 15 under the control of the main control section 19 (F1).
3) As described above, the motor 4 reversely rotates and the drive ring 1 restores the home position. Next, it is determined whether the home switch HS is open or closed, and if it is opened, the film feed (F15) and power-off (F16) operations are performed. If the home switch HS is not closed in step F7, the AF magnet 9 is immediately turned off (F17), and the reverse pulse for returning to the home position is sent eight times (F).
18) Do. When it is not confirmed that the home position has been restored in step F14, the reverse rotation pulse is sent again in steps F19 and F20. With the above, a series of operations of the motor-driven shutter is completed.

In the above embodiment, the opening ring 10 is used.
Although the shutter blade is opened via the opening ring, the shutter blade may be opened directly by another actuator without using the opening ring 10. In the above embodiment, the locking lever 8 and the ratchet wheel 7 are operated by controlling the electromagnet 9 to hold the distance ring 6 at the set position. Instead of these members, the sector gear 6 is used.
A setting lever (a member having the same function as the setting lever 20) that engages with b and a locking member (for example, a member having the same function as the closing lever 22) that interlocks with the setting lever are provided, and the motor 4 rotates normally for focus adjustment. The setting lever may be slid by the sector gear 6b and the locking member may lock the distance ring 6 in that position by reversing the drive ring 1 in the turning process. Further, in the above-described embodiment, the shutter blade 10a is opened when the release ring 10 is unlocked and pivots. However, the shutter blade 10a is alternately operated to the open / close position like a step motor and the shutter blade 10a is opened. May be driven.

In the above embodiment, the diaphragm lever 5 opens the diaphragm blades in the normal state shown in FIG. 1, but it may be closed in the state shown in FIG. In that case, for example, an intermediate member may be provided between the pin 5a and the cam portion 13b. Further, the operation of locking the closing lever 22 to the closing claw 23 by the engagement of the pin 10b and the protrusion 22e,
The operation in which the motor 4 reverses to rotate the ratchet wheel 7 to operate the locking lever 8 at the beginning of the next series of operations, not at the end of the series of operations of the motor-driven shutter as in the above embodiment. You may go at the same time.

Further, in the above-described embodiment, the operation of closing the diaphragm blade for ending the exposure is released by the reverse rotation of the motor 4 to release the engagement between the curved portion 22c and the closing claw 23 and rotate the closing lever 22. However, the protrusion 20d is extended to engage with the curved portion 22c, and the pin 20 of the setting lever 20
By increasing the movement length with respect to a, the motor 4 is additionally rotated in the normal direction, and at that time, the curved portion 22c engaging with the protrusion 20d instead of the closing pawl 23 is released, and the closing lever 22 is removed.
May be allowed to turn. Further, in the above embodiment, the step motor is used as the power, but the same effect can be obtained by using an ultrasonic motor, a DC motor having an encoder, or the like.

[0019]

As described above, according to the present invention, while the shutter blade 10a is closed, the drive ring 1 is actuated by the motor 4 and the photographing lens is set to the in-focus position. The drive ring 1 is connected to the aperture ring 13, the aperture lever 5 moves the aperture blades to the set value by the cam portion 13b, and the operating aperture value is set by the reverse rotation of the motor 4, and at the same time, the shutter opens, and then the motor 4 turns. By operating, the diaphragm blades are closed. Therefore, with a single motor as the drive source, lens setting, aperture setting, shutter opening,
Since a series of operations of closing can be performed promptly, the photographing timing can be shortened.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a motor drive shutter according to the present invention.

FIG. 2 is a block diagram showing a control system of the motor drive shutter shown in FIG.

3 is a flowchart showing a control sequence of the control system shown in FIG.

FIG. 4 is a flowchart showing details of step F12 in the flowchart shown in FIG.

FIG. 5 is an exposure characteristic diagram showing an operational relationship between diaphragm blades and shutter blades.

[Explanation of symbols]

 1 Drive Ring 4 Motor 5 Aperture Lever 6 Distance Ring 7 Ratchet Wheel 8 Locking Lever 9 Electromagnet 10 Opening Ring 12 Connection Lever 13 Aperture Ring 10a Shutter Blade 20 Setting Lever 21 Opening Claw 22 Closing Lever 23 Closing Claw

Claims (1)

[Claims] 1. A single motor whose forward and reverse rotation is controlled,
In a motor-driven shutter having a taking lens controlled by the motor, an aperture blade and a shutter blade,
A drive member operated by the motor, a distance member that sets the photographing lens to a predetermined value via the drive member by the normal rotation of the motor, a diaphragm member that sets the diaphragm blades to a predetermined value, and the diaphragm. A connecting member for connecting the member to the drive member; a closing member for locking the diaphragm blade to a closing position for locking the charging blade; and a shutter blade for locking the closing blade and biasing the shutter blade in the opening direction. The drive member connects the connecting member to the diaphragm member to set a predetermined diaphragm in response to a signal for setting the drive member to a predetermined value, and unlocks the shutter to release the shutter blade. A motor-driven shutter, characterized in that the locking of the closing member is released by the subsequent operation of the motor to close the diaphragm blade.