JPH0739031U - Motor drive shutter - Google Patents

Abstract

(57) [Summary] [Structure] A drive member actuated by a single motor that rotates in the normal and reverse directions actuates an opening member and a closing member that are biased by a spring, and an opening control member actuates the opening member. The opening control member and the closing member are configured to be selectable by selecting means. Further, the driving member moves the photographic lens, and the opening control member controls the stop position of the photographic lens, and at the same time, a shutter opening / closing operation capable of aperture setting operation is performed. . [Effect] Since the opening member for opening the shutter and the opening control member for controlling the operation timing of the shutter are separated, the opening spring for driving the opening member only needs to be biased by a desired amount of force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shutter for a camera, and more particularly to a motor-driven shutter in which operation of a photographing lens, setting of an aperture value and exposure operation are performed by a single motor.

[0002]

[Prior art]

 In FIG. 11 showing a conventional example, a permanent magnet rotor 101 of a step motor fixed to a shutter substrate A is rotatably supported together with a pinion 101a. The gear 102 is formed integrally with the pinion 102a and is rotatably supported by the pinion 101a so as to mesh therewith. The drive ring 103 includes a toothed wheel 103a that meshes with the pinion 102a, cam portions 103b and 103c that are control portions, and a protrusion 103e, and is rotatably supported around the taking lens L.

The distance ring 104 that moves the taking lens L from the stop position to the focus position includes a curved portion 104a that engages with the protrusion 103e, a curved portion 104b that operates the photographing lens L, a toothed wheel 104c, and a protrusion. The right turning force is biased around the taking lens L by a spring 104e acting on the protrusion 104d.

The ratchet wheel 105 has a ratchet portion 105a, is integrally formed with a pinion 105b that meshes with a gear 104c, and is rotatably supported. The locking lever 106 has a locking portion 106a that engages with the ratchet portion 105a and a protrusion 106b that extends to the other side, and is urged by the spring 106c to the right turning force to be pivotally supported by the shaft 106d. .

The opening lever 107 has an operating portion 107a that engages with the cam portions 103b and 103c, a fork portion 107b, and an actuating pin 107c that engages with the protrusion 106b. The shaft 107e is rotatably supported by the shaft 107e. The pin 108a is formed integrally with a shutter blade driving member 108, which will be described later, for operating the shutter blade, and is engaged with the fork portion 107b.

The electromagnet 109 is excited by the coil 109a, attracts and holds the iron piece 109b fitted to the operating portion 107a against the spring 107d, and restricts the operation of the opening lever 107. The shutter blade drive member 108 shown in FIG. 12 is rotatably supported in the vicinity of the lens L, and by rotating rightward, the shutter blade BS operates in the direction in which the lens opening O is opened by a known method.

When the step motor reversely rotates from the state shown in FIG. 11 showing the initial state, the rotor 101 rotates counterclockwise, and the drive ring 103 is rotated by the gear 103 a via the gear 102 against the spring 104 e and the distance ring 104. Turn left with. At this time, the operating portion 107a of the opening lever 107 is pushed by the left end of the cam portion 103b and turns right while further charging the spring 107d, and the iron piece 109b slides along the attraction surface of the electromagnet 109 in a known direction. Then, the projection 106b is pushed by the operating pin 107c, the locking lever 106 turns left, and the locking portion 106a comes out of the operating range of the ratchet portion 105a. At this time, the shutter blade 116 is rotated to the position shown by the alternate long and short dash line in FIG.

[0008]

[Problems to be solved by the device]

 In the configuration of the conventional example, in order to disengage the locking portion 106a from the operating range of the ratchet portion 105a, the opening lever 107 must be rotated further rightward from the initial position by the cam portion 103b against the spring 107d.

Since it is necessary to strengthen the spring 107d in the high-speed shutter, a step motor that generates a large torque is required to rotate the opening lever 107 clockwise. This has been an obstacle to downsizing of the shutter and power saving. Further, since the shutter blade Bs needs to cover the lens opening O even at the position indicated by the alternate long and short dash line in FIG. 12, a large size is required, which also hinders the downsizing of the shutter. Therefore, an object of the present invention is to realize a shutter that is downsized and saves power.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, a motor-driven shutter according to the present invention includes a drive member having first and second control units whose forward and reverse rotations are controlled by a single motor whose forward and reverse rotations are controlled. An opening member that is operated by the first control unit, an opening spring that biases the opening member in the opening direction of the shutter, and an opening that operates the opening member in the closing direction of the shutter against the opening spring. A control member, a first electromagnet that controls the operation timing of the opening control member, a closing member that is operated by the second control member, a closing spring that biases the closing member in the closing direction of the shutter, and A second electromagnet for controlling the operation timing of the closing member against the closing spring, and a selection means for selecting excitation or non-excitation of the first and second electromagnets are provided, and the operation of the driving member is performed. Opening and closing the shutter by In the motor-driven shutter in which the selecting means controls the excitation or non-excitation of the first or second electromagnet to open and close the shutter by the opening member and the closing member prior to the movement, No. 1 electromagnet and the opening control member can be operated a plurality of times, a distance member for moving the taking lens from the stop position to the focus adjustment position, and a stop member for stopping the distance member at the focus adjustment position of the taking lens. And the drive member operates the distance member prior to the opening / closing operation of the shutter by the operation of the drive member, and the first electromagnet at the focus adjustment position performs the first operation by the first operation. After the first operation of the control member is controlled to operate the stop member to stop the distance member, the selection member causes the second operation of the first electromagnet to be performed. Said opening member and by controlling the operation of the second operation and the second electromagnet open control member associated therewith, by the closure member, so that opening and closing operation of the shutter.

[0011]

[Action]

 A drive member operated by a single motor that rotates forward and reverse operates an opening member and a closing member which are biased by a spring, and an opening control member controls the opening member and the opening control. The member and the closing member are configured to be selectable by the selecting means. Further, the driving member moves the photographic lens, and the opening control member controls the stop position of the photographic lens, and at the same time, a shutter opening / closing operation capable of aperture setting operation is performed. .

[0012]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 10 is a block diagram showing the outline of the present invention. The shutter S, which has a motor m built therein and also has a photographing lens drive unit, is controlled by an electronic circuit Sc which is a means for selecting each operation mode. The battery E is supplied to the electronic circuit Sc via the power supply circuit Pc, and controls the shutter S, the flash device F, the film winding motor Mw, and the zoom lens operating motor Mz. The electronic circuit Sc includes a photometric circuit Bm for measuring the brightness of the subject and a control circuit Cc for exchanging signals with the distance measuring circuit Dm for measuring the distance to the subject, and is set to select various shooting modes. The means Ms and the switch Sw for inputting the selection signal are connected. The control circuit Cc operates the shutter S, the flash device F, the film winding motor Mw, the zoom lens operating motor Mz, and the like via the drive circuit Dc.

In FIG. 1, a permanent magnet rotor 1 of a step motor fixed to a shutter substrate A is rotatably supported together with a pinion 1a. The gear 2 is formed integrally with the pinion 2a, and is rotatably supported by the pinion 1a so as to mesh therewith. The drive ring 3 includes a gear 3a that meshes with the pinion 2a, cam portions 3c and 3d that are control portions, and a protrusion 3e, and is rotatably supported around the taking lens L.

The distance ring 4 for moving the taking lens L from the stop position to the focus position includes a curved portion 4a that engages with the protrusion 3e, a curved portion 4b that operates the photographing lens L, a gear 4c, and a protrusion 4d. And the end portion 4f, and the spring 4e acting on the protrusion 4d biases the right turning force around the taking lens L.

The ratchet wheel 5 has a ratchet portion 5a, is integrally formed with a pinion 5b that meshes with a gear 4c, and is rotatably supported by a shaft. The locking lever 6 has a locking portion 6a that engages with the ratchet portion 5a and a projection 6b that extends to the other side, and is urged by a spring 6c to the right turning force to be pivotally supported 6d. The iron piece lever 14 has an arm portion 14a that engages with the end portion 4f, an arm portion 14b that engages with the protrusion 6c, an operation portion 14c, and an arm portion 14d, and a weak left turning force is biased by the spring 14e. The shaft 14f is rotatably supported. The stopper 15 is arranged on the shutter substrate A.

The release lever 7 has a pin portion 7a that engages with the cam portion 3c, a fork portion 7b, and a pin 7c that engages with the arm portion 14d. The spring 7d, which is sufficiently stronger than the spring 14e, exerts a left turning force. It is urged and pivotally supported by the shaft 7e. Similar to the conventional example shown in FIG. 12, the pin 8a is for operating the shutter blade Bs and is engaged with the fork portion 7b. The electromagnet 9 is excited by the coil 9a and attracts and holds the iron piece 9b fitted to the operating portion 14c against the spring 14e to restrain and control the operation of the iron piece lever 14.

The closing lever 10 has a pin 10a that engages with the cam portion 3d, a fork portion 10b, and an operating portion 10c, and is rotatably pivotally supported 10e by being biased to the left turning force by a spring 10d. There is. The pin 11a is formed integrally with a diaphragm blade driving member 11 described later and operates the diaphragm blade Ba, and is engaged with the fork portion 10b. The diaphragm blade drive member 10 shown in FIG. 13 is rotatably supported around the lens L and rotates rightward to operate the diaphragm blade Ba in a direction to cover the lens opening O.

The electromagnet 12 is excited by the coil 12a, attracts and holds the iron piece 12b fitted to the operating portion 10c against the spring 10d, and restricts the operation of the closing lever 10. The electronic circuit 13 that selectively controls the energization of the coils 9a and 12a of the electromagnets 9 and 12 is switched by the mode selection of the camera. With respect to each of the above structures formed on the shutter substrate A, an operation method in the case where the exposure operation is performed according to a preselected aperture value will be described below.

When the step motor reversely rotates from the state of FIG. 1, the rotor 1 rotates counterclockwise, and the drive ring 3 is rotated leftward together with the distance ring 4 by the gear 3a via the gear 2 against the spring 4e. To do. At this time, since the arm portion 14a of the iron piece lever 14 is pushed by the end portion 4f and turns right against the spring 14e, the iron piece 9b slides along the attracting surface of the electromagnet 9 in a known direction, and the arm portion The protrusion 6b is pushed by 14b, the locking lever 6 turns left, and the locking portion 6a escapes from the operating range of the ratchet portion 5a. At this time, as compared with the spring 14e, the opening lever 7 urged by the spring 7d that is sufficiently strong is not rotated to the right, so that the required motor torque is small. The ratchet portion 5a is formed so as to push up the locking portion 6a when turning right, but is restrained from operating in the left turning direction by the locking portion 6a. ing.

When the motor operates up to this state, the electronic circuit 13 energizes the coil 9a, so that the electromagnet 9 is excited, the iron piece 9b is adsorbed and held, and the iron piece lever 14 is held in the inoperative state (state of FIG. 2). ).

Here, the step motor moves to the forward rotation and the drive ring 3 turns right while the distance ring 4 follows the projection 3e with the curved portion 4a by the spring 4e, and at the same time, the ratchet wheel 5 turns left by the gear 4c. Let In this process, when the in-focus position of the taking lens L 1 is confirmed by a known method, the step motor is temporarily stopped, and the coil 9a is de-energized by the electronic circuit 13, whereby the iron piece lever 14 Is rotated left by the spring 14e until the arm portion 14b contacts the stopper 15. Therefore, the protrusion 6b follows the arm portion 14b, and the locking lever 6 is rotated rightward by the spring 6c to a position where the locking portion 6a locks the ratchet portion 5a. Therefore, the distance ring 4 can no longer follow the drive ring 3, and the taking lens L is set to the in-focus position (state in FIG. 3).

When the step motor starts to rotate forward, in synchronization with this, the electronic circuit 13 controls the power supply timing to the coil 12a so as to set the aperture diameter of the photographing lens L. That is, since the coil 12a is not energized, when the drive ring 3 turns to the right, the pin 10a follows the cam portion 3d and the spring 10d turns the closing lever 10 to the left to actuate the pin 11a to move to a predetermined throttle. The step motor rotates forward until the value is reached. Therefore, the electronic circuit 13 energizes the coil 12a to excite the electromagnet 12, adsorbs and holds the iron piece 12b, and holds the closing lever 10 against the spring 10d at the position of the cam portion 3d corresponding to a predetermined aperture value. Restrain the operating state (state of FIG. 4). Since the two electromagnets 9 and 12 are independently controlled, it is not unique which is set first in correspondence with the focus position and the aperture value setting position.

Subsequently, when the step motor rotates forward, the electronic circuit 13 energizes the coil 9 again to excite the electromagnet 9, so that the iron piece lever 14 is restrained from operating again, and the pin 7c comes into contact with the arm portion 14d. As a result, the opening lever 7 is also prevented from turning to the left, and when the pin 7a has passed the operating range of the cam portion 3c, the power supply to the coil 9 is cut off. At this time, the opening lever 7 is swung to the left rapidly by the spring 7d while turning the iron piece lever 14 to the right, and the pin 8a is actuated to actuate the shutter blade Bs in the direction in which the lens opening is rapidly opened to perform the exposure operation. Start (state of FIG. 5). If flash light is required, it is emitted at this point (state of FIG. 8). As described above, the lens aperture is set to the aperture value at the position where the electromagnet 12 restrains the closing lever 10 depending on the cam portion 3d.

When the desired exposure time elapses, the electronic circuit 13 de-energizes the coil 12a, and the electromagnet 12 is demagnetized. Therefore, the closing lever 10 rapidly turns to the left by the spring 10d to operate the pin 11. Then, the above-mentioned diaphragm blade Ba is rapidly closed to end the exposure (state of FIG. 6). The above operation is shown in FIG. 7 as time passes. After that, when the step motor 1 rotates in the reverse direction, the drive ring 3 turns left together with the distance ring 4 against the spring 4e. At this time, the ratchet wheel 5 turns right by the gear 4c while pushing up the locking portion 6a, as in the initial stage of the reverse rotation operation described above.

On the other hand, by the cam portion 3c, the pin 7a is pushed, the opening lever turns counterclockwise against the spring 7d, and the pin 8 is actuated to close the shutter blade Bs in the opened state. 14 is rotated left by a spring 14e. Further, when the step motor reversely rotates, the pin 10a is pushed by the cam portion 3d, the closing lever 10 turns right against the spring 10d, and the pin 11 is actuated to open the closed diaphragm blade Ba. To do. The step motor 1 stops at the initial state shown in FIG. 1 and ends one operation.

Next, regarding the operation in the case of performing the program exposure operation according to the brightness of the subject, only the part different from the above case will be described. After the stepper motor 1 rotates forward to demagnetize the electromagnet 9 and the ratchet wheel 5 is stopped, the electronic circuit 13 does not energize the coil 9a but continues to energize the coil 12a. When the step motor 1 further rotates forward in this state, the pin 7a follows with the biasing force of the spring 7d according to the inclination of the cam portion 3c, and the opening lever 7 turns left about the shaft 7e. Therefore, the pin 8 opens the shutter blade Bs at a speed corresponding to the inclination of the cam portion 3c depending on the normal rotation of the step motor 1.

When reaching 1/2 of the exposure amount corresponding to the brightness of the subject, the step motor 1 rotates in the reverse direction, and therefore the drive ring 3 turns left to rotate the opening lever 7 right against the spring 7d. , The shutter blades are closed to end the exposure. After that, the electronic circuit 13 cuts off the power supply to the coil 12a and returns to the state of FIG. 1 showing the initial state as in the case described above.

That is, the exposure operation is performed in a time corresponding to the rotation speed of the step motor 1 by operating only the shutter blade by the opening lever 7. FIG. 9 shows the opening / closing waveform with respect to the elapsed time of the shutter blade in this case.

In the above description, a specific example using a step motor is shown, but other types of motors, such as ultrasonic motors, are also possible as long as speed control is possible. The electromagnets 9 and 12 may be of a type in which the plunger is actuated by energization, or may be one in which the iron piece lever 14 and the closing lever 10 are restrained and controlled by another method such as by rotating the permanent magnet rotor. Good.

Further, although the above embodiment is realized with respect to a camera in which the lens opening is closed in the initial state, it can also be realized as a shutter of a type in which the lens opening is opened in the initial state like a single lens reflex camera. . That is, if the opening lever 7 is configured to be indirectly operated by the intermediate member via the elastic body without directly operating the shutter blade driving member 8, it can be easily realized by a known method. Further, the present invention is not limited to the above-mentioned embodiment, and embodiments modified by the same concept are possible.

[0031]

[Effect of device]

 As apparent from the above description, according to the configuration of the present invention, it is not necessary to operate the opening member 7 having a strong spring force by the driving member in the initial stage of operation, and the engagement between the locking lever 6 and the ratchet portion 5 is not required. Since it can be released, a large torque motor is not required. This makes it possible to reduce the size of the motor, and thus the shutter, and save power.

Further, at this time, since the opening member 7 does not operate, the shutter blade Bs does not rotate to the position shown by the alternate long and short dash line in FIG. Therefore, the shutter blade Bs only needs to cover the lens opening O in the initial state, so that it can be made small. This makes it possible to reduce the size of the shutter.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention before starting operation.

FIG. 2 is a plan view immediately after the operation of the embodiment of the present invention.

FIG. 3 is a plan view showing an in-focus position according to an embodiment of the present invention.

FIG. 4 is a plan view after setting an aperture value, showing an embodiment of the present invention.

FIG. 5 is a plan view showing a shutter opening operation according to an embodiment of the present invention.

FIG. 6 is a plan view showing a state in which the shutter exposure operation is finished according to the embodiment of the present invention.

FIG. 7 is a diagram showing a series of operation sequences showing an embodiment of the present invention.

FIG. 8 is a diagram showing an opening / closing operation by a spring according to an embodiment of the present invention.

FIG. 9 is a diagram showing an opening / closing operation by a motor according to an embodiment of the present invention.

FIG. 10 is a block diagram showing an overall configuration showing an embodiment of the present invention.

FIG. 11 is a plan view of the conventional embodiment before the start of operation.

FIG. 12 is a plan view showing the operation of shutter blades.

FIG. 13 is a plan view showing the operation of diaphragm blades.

[Simple explanation of symbols]

 1 Motor Rotor 3 Drive Ring (Drive Member) 4 Distance Ring (Distance Member) 7 Open Lever (Open Member) 9 First Electromagnet (Mg1) 10 Closing Lever (Closed Member) 12 Second Electromagnet 13 Electronic Circuit (Sc) ) 14 Iron piece lever (opening control member)

Claims (1)

[Scope of utility model registration request] 1. A drive member having first and second control units whose forward and reverse rotations are controlled by a single motor whose forward and reverse rotations are controlled, and an opening member which is operated by the first control unit. , An opening spring that biases the opening member in the opening direction of the shutter, an opening control member that operates the opening member in the closing direction of the shutter against the opening spring, and an operation timing of the opening control member A first electromagnet, a closing member that is operated by the second control member, a closing spring that biases the closing member in the closing direction of the shutter, and an actuation timing of the closing member against the closing spring. A second electromagnet and a selection means for selecting excitation or non-excitation of the first and second electromagnets, and the selection means operates to open or close the shutter by the operation of the drive member. , The second electromagnet In a motor-driven shutter that controls excitation or de-excitation of the shutter to open / close the shutter by the opening member and the closing member, the selection member allows the first electromagnet and the opening control member to be operated a plurality of times. A distance member that moves the photographing lens from the stop position to the focus adjustment position, and a stop member that stops the distance member at the focus adjustment position of the photographing lens, prior to the opening / closing operation of the shutter by the operation of the driving member, The drive member operates the distance member, and the first electromagnet performs the first operation at the focus adjustment position to control the first operation of the opening control member to operate the stop member to operate the distance member. After stopping the operation, the selection member causes the second operation of the first electromagnet and the second operation of the opening control member and the operation of the second electromagnet associated therewith. Controlled to the opening member and, by the closure member, a motor driving the shutter, characterized in that for opening and closing operation of the shutter.