Source: http://www.google.com/patents/US6331741?dq=5,870,513
Timestamp: 2016-10-23 21:23:53
Document Index: 751405484

Matched Legal Cases: ['art 1', 'art 2', 'art 1', 'art 1', 'arts 3', 'arts 5', 'arts 7', 'arts 7', 'arts 8', 'arts 8', 'art 9', 'art 10', 'arts 10', 'arts 10', 'arts 9', 'art 11', 'art 11', 'art 11', 'art 12', 'art 12', 'art 14', 'art 11', 'art 14', 'art 14', 'art 1', 'art 14', 'art 14', 'art 14', 'arts 15', 'art) 14', 'art 14']

Patent US6331741 - Electromagnetic driving device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsIn a motor or an electromagnetic driving device having a first stator yoke excitable by energizing a first coil, a second stator yoke excitable by energizing a second coil and a rotor opposed to the first and second stator yokes to be driven and rotated by energizing the first and second coils, the first...http://www.google.com/patents/US6331741?utm_source=gb-gplus-sharePatent US6331741 - Electromagnetic driving deviceAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6331741 B1Publication typeGrantApplication numberUS 09/438,489Publication dateDec 18, 2001Filing dateNov 12, 1999Priority dateNov 16, 1998Fee statusLapsedPublication number09438489, 438489, US 6331741 B1, US 6331741B1, US-B1-6331741, US6331741 B1, US6331741B1InventorsRyuji SuzukiOriginal AssigneeCanon Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (14), Referenced by (19), Classifications (8), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetElectromagnetic driving device
US 6331741 B1Abstract
What is claimed is: 1. An electromagnetic driving device comprising:
a first permanent magnet; a second permanent magnet arranged to be opposed to said first permanent magnet; a rotation shaft arranged to interconnect said first permanent magnet and said second permanent magnet, said rotation shaft constituting a rotor in conjunction with said first permanent magnet and said second permanent magnet and having a rotation output part arranged to allow a rotation output to be externally taken out from between said first permanent magnet and said second permanent magnet; a first stator yoke having magnetic poles opposed to a peripheral part of said first permanent magnet, said first stator yoke being arranged to extend from the peripheral part of said first permanent magnet toward an outside thereof; a second stator yoke having magnetic poles opposed to a peripheral part of said second permanent magnet, said second stator yoke being arranged to extend from the peripheral part of said second permanent magnet toward an outside thereof in the same direction as the extending direction of said first stator yoke; a first coil arranged to excite said first stator yoke, said first coil being disposed at said first stator yoke; and a second coil arranged to excite said second stator yoke, said second coil being disposed at said second stator yoke. 2. An electromagnetic driving device according to claim 1, wherein one end side of said first stator yoke is provided with the magnetic poles and the other end side of said first stator yoke extends from the peripheral part of said first permanent magnet toward the outside thereof, and one end side of said second stator yoke is provided with the magnetic poles and the other end side of said second stator yoke extends from the peripheral part of said second permanent magnet toward the outside thereof in the same direction as the extending direction of the other end side of said first stator yoke.
a rotor having a rotation output part; a first stator yoke opposed to a peripheral part of said rotor, said first stator yoke being arranged to extend from the peripheral part of said rotor toward an outside thereof; a second stator yoke opposed to the peripheral part of said rotor, said second stator yoke being arranged to extend from the peripheral part of said rotor toward the outside thereof in the same direction as the extending direction of said first stator yoke; a first coil arranged to excite said first stator yoke, said first coil being disposed at said first stator yoke; and a second coil arranged to excite said second stator yoke, said second coil being disposed at said second stator yoke, wherein the rotation output part of said rotor is arranged to allow a rotation output to be externally taken out from a thrust clearance between said first stator yoke and said second stator yoke. 8. An electromagnetic driving device according to claim 7, further comprising:
a first fixing member arranged to support said first stator yoke and said first coil; and a second fixing member arranged to support said second stator yoke and said second coil, said second fixing member being engaged with said first fixing member. 9. An electromagnetic driving device according to claim 8 further comprising a moving member arranged to be movable between said first fixing member and said second fixing member, said moving member being driven by the rotation output part of said rotor.
a rotor having a rotation output part; a first stator yoke opposed to a peripheral part of said rotor; a second stator yoke opposed to the peripheral part of said rotor, said second stator yoke being arranged to extend from the peripheral part of said rotor toward an outside thereof together with said first stator yoke and being disposed to be superposed on said first stator yoke; a first coil arranged at said first stator yoke to excite said first stator yoke; and a second coil arranged at said second stator yoke to excite said second stator yoke, energization of said first coil and said second coil being controlled to control rotation of said rotor, wherein the rotation output part of said rotor is arranged to allow a rotation output to be externally taken out from a thrust clearance between said first stator yoke and said second stator yoke. 12. An electromagnetic driving device according to claim 11, further comprising:
a first fixing member arranged to support said first stator yoke and said first coil; and a second fixing member arranged to support said second stator yoke and said second coil, said first fixing member and said second fixing member being engaged with each other to be united. 13. An electromagnetic driving device according to claim 12, further comprising a moving member arranged to be movable between said first fixing member and said second fixing member, said moving member being driven by the rotation output part of said rotor.
a rotor having a rotation output part arranged to allow a rotation output to be externally taken out; a first stator yoke opposed to a peripheral part of said rotor; a second stator yoke opposed to the peripheral part of said rotor, said second stator yoke being arranged to extend from the peripheral part of said rotor toward an outside thereof together with said first stator yoke and being disposed to be superposed on said first stator yoke; a first coil arranged at said first stator yoke to excite said first stator yoke; a second coil arranged at said second stator yoke to excite said second stator yoke, energization of said first coil and said second coil being controlled to control rotation of said rotor; a first fixing member arranged to support said first stator yoke and said first coil, said first fixing member having an aperture part formed on an inner circumferential side thereof to allow photo-taking light to pass therethrough; a plurality of diaphragm blades arranged to adjust a quantity of the photo-taking light; a second fixing member arranged to hold said plurality of diaphragm blades between said first fixing member and said second fixing member; and a working member for driving said plurality of diaphragm blades, said working member being arranged between said first fixing member and said second fixing member to be driven by the rotation output part of said rotor, wherein the rotation output part of said rotor is arranged to allow the rotation output to be externally taken out from a thrust clearance between said first stator yoke and said second stator yoke. 16. An electromagnetic driving device according to claim 15, wherein said working member is arranged to intrude into the thrust clearance between said first stator yoke and said second stator yoke.
a rotor having a rotation output part arranged to allow a rotation output to be externally taken out; a first stator yoke opposed to a peripheral part of said rotor; a second stator yoke opposed to the peripheral part of said rotor, said second stator yoke being arranged to extend from the peripheral part of said rotor toward an outside thereof together with said first stator yoke and being disposed to be superposed on said first stator yoke; a first coil arranged at said first stator yoke to excite said first stator yoke; a second coil arranged at said second stator yoke to excite said second stator yoke, energization of said first coil and said second coil being controlled to control rotation of said rotor; a first fixing member arranged to support said first stator yoke and said first coil; a second fixing member arranged to support said second stator yoke and said second coil, said second fixing member being engaged with said first fixing member; a moving member arranged to be movable between said first fixing member and said second fixing member, said moving member being driven by the rotation output part of said rotor; and detection means, disposed at a position approximately opposed to a peripheral part of said moving member, for detecting movement of said moving member, wherein said first coil and said second coil are arranged in alignment in a direction in which said first fixing member, said second fixing member and said moving member are arranged, and wherein a terminal part of said first coil, a terminal part of said second coil and a terminal part of said detection means are arranged to extend in a direction perpendicular to the direction in which said first fixing member, said second fixing member and said moving member are arranged. 19. An electromagnetic driving device according to claim 18, wherein said detection means includes an optical sensor having a light emitting part and a light receiving part, and detects the movement of said moving member according to a light-blocking part formed at the peripheral part of said moving member coming into and going out from a space between the light emitting part and the light receiving part.
a rotor having a rotation output part arranged to allow a rotation output to be externally taken out; a first stator yoke opposed to a peripheral part of said rotor; a second stator yoke opposed to the peripheral part of said rotor, said second stator yoke being arranged to extend from the peripheral part of said rotor toward an outside thereof together with said first stator yoke and being disposed to be superposed on said first stator yoke; a first coil arranged at said first stator yoke to excite said first stator yoke; a second coil arranged at said second stator yoke to excite said second stator yoke, energization of said first coil and said second coil being controlled to control rotation of said rotor; a first fixing member arranged to support said first stator yoke and said first coil, said first fixing member having an aperture part formed on an inner circumferential side thereof to allow photo-taking light to pass therethrough; a plurality of diaphragm blades arranged to adjust a quantity of the photo-taking light; a second fixing member arranged to hold said plurality of diaphragm blades between said first fixing member and said second fixing member; a working member for driving said plurality of diaphragm blades, said working member being arranged between said first fixing member and said second fixing member to be driven by the rotation output part of said rotor; and detection means, disposed at a position approximately opposed to a peripheral part of said working member, for detecting movement of said working member, wherein said first coil and said second coil are arranged in alignment in a direction in which said first fixing member, said second fixing member and said working member are arranged, and wherein a terminal part of said first coil, a terminal part of said second coil and a terminal part of said detection means are arranged to extend in a direction perpendicular to the direction in which said first fixing member, said second fixing member and said working member are arranged. 21. An electromagnetic driving device according to claim 20, wherein said detection means includes an optical sensor having a light emitting part and a light receiving part, and detects the movement of said working member according to a light-blocking part formed at the peripheral part of said working member coming into and going out from a space between the light emitting part and the light receiving part.
Referring to FIGS. 1, 2 and 3, a first rotor 1, which is made of a permanent magnet, has a magnetized part formed on its outer circumferential surface to have six magnetic poles. At the first rotor 1, rotation shafts 1 a and 1 b, a gear 1 c which is a rotation output part and a shaft part 1 d are formed in one unified body.
A second rotor 2, which is made of a permanent magnet, has a magnetized part formed on its outer circumferential surface to have six magnetic poles. At the second rotor 2, a hole part 2 a is fitted on and secured to the shaft part 1 d of the first rotor 1. By this arrangement, a rotor “α” is formed to have the gear part 1 c at the center of thrust in the direction of its rotation axis, and to have cylindrical parts having the respective magnetized parts on their outer circumferential surfaces above and below the thrust part of the gear 1 c. The first rotor 1 and the second rotor 2 are secured to each other in such a way as to have their rotation phases differ 90 degrees from each other in terms of electrical angle. The gear 1 c is formed to have its diameter smaller than the diameters of the first and second rotors 1 and 2 which are made of permanent magnets.
A first stator yoke 3, which is made of a soft magnetic material, has two projections 3 a and 3 b arranged to be opposed to the magnetic pole part of the first rotor 1 at two parts thereof. The projections 3 a and 3 b, which serve as magnetic poles of a first stator, are located away 360 degrees from the magnetic poles of the first rotor 1 in terms of electrical angle.
Another first stator yoke 4, which is made of a soft magnetic material, has two projections 4 a and 4 b arranged to be opposed to the magnetic pole part of the first rotor 1 at two parts thereof. The projections 4 a and 4 b, which serve as magnetic poles of the first stator, are located away 360 degrees from the magnetic poles of the first rotor 1 in terms of electrical angle. Further, the projection 4 a is located 180 degrees away from the projection 3 a in terms of electrical angle. The projection 4 b is located 180 degrees away from the projection 3 b in terms of electrical angle. The first stator yoke 3 and the first stator yoke 4 abut each other at their root parts 3 c and 4 c to close a magnetic path, thus forming one of two phases of the two-phase stepping motor.
A second stator yoke 5 is composed of parts which are the same as the parts of the first stator yoke 3. The second stator yoke 5 has two projections 5 a and 5 b arranged to be opposed to the magnetic pole part of the second rotor 2 at two parts thereof. The two projections 5 a and 5 b, which serve as magnetic poles of a second stator, are located 360 degrees away from the magnetic poles of the second rotor 2 in terms of electrical angle.
Another second stator yoke 6 is composed of parts which are the same as the parts of the first stator yoke 4. The second stator yoke 6 has two projections 6 a and 6 b opposed to two magnetic pole parts of the second rotor 2 at two parts thereof. The projections 6 a and 6 b, which serve as magnetic poles of the second stator, are located 360 degrees away from the magnetic poles of the second rotor 2 in terms of electrical angle. Further, the projection 6 a is located 180 degrees away from the projections 5 a while the projection 6 b is located 180 degrees away from the projection 5 b in terms of electrical angle. The second stator yoke 5 and the second stator yoke 6 abut on each other at their root parts 5 c and 6 c to close a magnetic path, thus forming the other of two phases of the two-phase stepping motor. Further, the first stator yokes 3 and 4 are arranged to be superposed on the second stator yokes 5 and 6 in the direction of the rotation axis of the rotor α.
A first coil 7, which has terminal parts 7 a and 7 b, is inserted on the first stator yoke 3. The first coil 7 is arranged to excite the first stator yokes 3 and 4 when energized through the terminal parts 7 a and 7 b. A second coil 8 is composed of parts which are the same as those of the first coil 7. The second coil 8, which has terminal parts 8 a and 8 b, is inserted on the second stator yoke 5. The second coil 8 is arranged to excite the second stator yokes 5 and 6 when energized through the terminal parts 8 a and 8 b. Further, the first coil 7 and the second coil 8 are disposed to be collected in one direction outside the outer circumferential part of the rotor α.
A first motor case 9 is arranged to position and set the first stator yokes 3 and 4 in their places in a known manner. The first motor case 9 has a hole part 9 a in which the rotation shaft 1 a of the first rotor 1 is rotatably fitted.
A second motor case 10 is arranged to position and set the second stator yokes 5 and 6 in their places in a known manner. The second motor case 10 has a hole part 10 a in which the rotation shaft 1 b of the first rotor 1 is rotatably fitted. Further, the second motor case 10 is provided with claw parts 10 b and 10 c. The first and second motor cases 9 and 10 are positioned and caused to engage each other by inserting the claw parts 10 b and 10 c into groove parts 9 b and 9 c of the first motor case 9. By this arrangement, the stepping motor is formed into one unit, as shown in FIGS. 2 and 3.
As will be understood from the above description, the gear 1 c is located at the center part of thrust in the direction of the rotation axis of the rotor “α”. Therefore, the rotation output of the stepping motor is taken out from a thrust clearance provided between the first stator yokes 3 and 4 and the second stator yokes 5 and 6.
FIG. 4(a) shows the initial state of the stepping motor. In the initial state, the first coil 7 is energized to excite the projections 3 a and 3 b of the first stator yoke 3 into S poles and the projections 4 a and 4 b of the first stator yoke 4 into N poles, so that the center of magnetizing angle of the first rotor 1 is made to coincide with the angle center of the projections 3 a, 3 b, 4 a and 4 b. On the other hand, since the second coil 8 is not energized, the second stator yokes 5 and 6 are not excited. Therefore, the center of magnetizing angle of the second rotor 2 differs 90 degrees in electrical angle from the angle center of the projections 5 a, 5 b, 6 a and 6 b of the second stator yokes 5 and 6.
When the second coil 8 is energized, in this state, to excite the projections 5 a and 5 b of the second stator yoke 5 into S poles and the projections 6 a and 6 b of the second stator yoke 6 into N poles, the second rotor 2 is attracted and repelled by the magnetic poles. Then, the rotor α, which is composed of the first and second rotors 1 and 2, rotates clockwise. Then, since the first stator yokes 3 and 4 continue to be in their excited states, the rotor α(the first rotor 1 and the second rotor 2) stops after having rotated 45 degrees in electrical angle, as shown in FIG. 4(b).
Next, when the first stator yokes 3 and 4 are deexcited, the excitation of the second stator yokes 5 and 6 causes the second rotor 2 to rotate 45 degrees further clockwise in electrical angle in such a way as to make the magnetization angle center of the second rotor 2 to coincide with the angle center of the projections 5 a, 5 b, 6 a and 6 b. The second rotor 2 then comes to a stop after having rotated 45 degrees in electrical angle, as shown in FIG. 4(c).
Next, when the first coil 7 is energized again, the first stator yokes 3 and 4 are excited this time in such a way as to make the projections 3 a and 3 b of the first stator yoke 3 into N poles and the projections 4 a and 4 b of the first stator yoke 4 into S poles. The first rotor 1 is then attracted and repelled by these magnetic poles to cause the rotor α (the first rotor 1 and the second rotor 2) to rotate further clockwise. Then, since the second stator yokes 5 and 6 still continue to be in their excited states, the rotor α (the first rotor 1 and the second rotor 2) comes to a stop after having rotated 45 degrees in electrical angle, as shown in FIG. 4(d).
Next, when the second stator yokes 5 and 6 are deexcited, the excitation of the first stator yokes 3 and 4 causes the first rotor 1 to rotate 45 degrees further clockwise in electrical angle in such a way as to make the magnetization angle center of the first rotor 1 coincide with the angle center of the projections 3 a, 3 b, 4 a and 5 b. The first rotor 1 then comes to a stop after having rotated 45 degrees in electrical angle, as shown in FIG. 4(e). Thus, the stepping motor can be caused to rotate by continuously bringing about the above-stated excitation sequence. Incidentally, the stepping motor can be caused to rotate counterclockwise by reversing the above-stated excitation sequence.
Referring to FIGS. 5, 6 and 7, a conductive annular base plate 11 has an aperture part 11 a formed at its center part to allow light (photo-taking light, etc.) to pass therethrough. The annular base plate 11 has a cutaway part 11 c formed at a part in the circumferential direction thereof to provide a space for disposing the above-stated first motor case 9 there. The first motor case 9 is disposed within this space and is secured to the annular base plate 11, for example, by bonding or press-fitting or by some other suitable method. By this arrangement, as shown in FIG. 6, the first motor case 9 and the first stator yokes 3 and 4 (and also the first coil 7) which are held by the first motor case 9 are secured to a position close to the peripheral end face of the cutaway part 11 c of the annular base plate 11, i.e., close to the outer side of the annular base plate 11.
An annular cam plate 12 is made of an insulating material. A plurality of diaphragm cams 12 a are formed in the cam plate 12. The cam plate 12 has a cutaway part 12 c formed at a part in the circumferential direction thereof to provide a space for disposing the above-stated second motor case 10 there. The second motor case 10 is disposed within that space and is secured to the cam plate 12 by bonding or pressing-fitting or by some other suitable method. As shown in FIG. 6, the second motor case 10 and the second yokes 5 and 6 (and also the second coil 8) which are held by the second motor case 10 are thus secured to a position close to the peripheral end face of the cutaway part 12 c of the cam plate 12, i.e., close to the outer side of the cam plate 12.
A plurality of diaphragm blades (light-blocking members) 13 are provided with dowels 13 a, which are mounted on the reverse sides of the diaphragm blades 13 and are fitted in the diaphragm cams 12 a of the cam plate 12.
A rotary ring (moving member) 14 is arranged to rotate around an optical axis and has an aperture part formed in its center part for allowing light (photo-taking light, etc.) to pass therethrough. A plurality of holes 14 a are formed in the rotary ring 14. Dowels 13 b which are formed on the surface of the diaphragm blades 13 are fitted in the holes 14 a of the rotary ring 14.
A flange part 14 b of the rotary ring 14 is fitted on the hole part 11 a of the annular base plate 11. The rotary ring 14 is thus rotatably supported by the annular base plate 11. The rotary ring 14 is provided with a gear part 14 c. The gear part 14 c is arranged to be in mesh with the gear part 1 c of the first rotor 1 within the electromagnetic driving motor A. The rotary ring 14 is provided further with a projection 14 d which is arranged to be insertable into a slot 11 b provided in the annular base plate 11. The cam plate 12 is provided with base seats 12 b. The cam plate 12 is secured to the annular base plate 11 with screws or the like by inserting the base seats 12 b in holes 11 d of the annular base plate 11 with the rotary ring 14 interposed in between them. The annular base plate 11, the cam plate 12, the diaphragm blades 13 and the rotary ring 14 are thus unitized to form the diaphragm device B. The diaphragm device B is provided with a switch for detecting whether the aperture of the diaphragm device B is at a full open position.
A photo-interrupter 15 which is a component element of the switch is secured to the annular base plate 11 by bonding or some other known method. Whether or not the diaphragm is at its full-open aperture position is detected in the following manner. When the aperture of the diaphragm is fully opened, the projection 14 d of the rotary ring 14 blocks light between the light projecting element and the light receiving element of the photo-interrupter 15, so that the full-open state of the aperture can be detected. The diaphragm device B is arranged in the above-described manner.
The arrangement described above operates in the following manner. When the electromagnetic driving motor A rotates, the output of the motor A is transmitted by the gear 1 c of the first rotor 1 to the gear part 14 c of the rotary ring 14. The rotary ring 14 is thus caused to rotate by a predetermined angle. The rotation of the rotary ring 14 causes the dowels 13 b provided on the surfaces of the diaphragm blades 13 to move in the direction of the rotation. Then, the dowels 13 a on the reverse sides of the diaphragm blades 13 are caused by their relation to the diaphragm cams 12 a of the cam plate 12 to perform a stopping action in a known manner to swing the diaphragm blades 13 in the direction of opening or closing the aperture. An exposure is adjusted in this manner.
Referring first to FIG. 6, the first stator yokes 3 and 4 are placed in a thrust space of the annular base plate 11. The second stator yokes 5 and 6 are placed in a thrust space of the cam plate 12. The gear 1 c of the first rotor 1 is interposed in between the first stator yokes 3 and 4 and the second stator yokes 5 and 6 (in the center of thrust in the direction of the axis of rotation of the rotor) in such a way as to enable the gear 1 c to intermesh with the gear part 14 c of the rotary ring 14 which is interposed in between the annular base plate 11 and the cam plate 12. Therefore, the electromagnetic driving motor A can be arranged to be almost completely not protruding from the diaphragm device B. The electromagnetic driving diaphragm device is thus arranged to have the electromagnetic driving motor A mounted thereon with excellent matching.
Further, in mounting the electromagnetic driving motor A on the diaphragm device B, the gear part 14 c of the rotary ring 14 and the gear 1 c within the driving motor A can be intermeshed by sliding the whole electromagnetic driving motor A in the direction of orthogonally intersecting the direction of the axis of rotation of the rotary ring 14.
The sensor 15 is arranged to detect whether or not the diaphragm blades 13 are at a full-open position. The sensor 15 is a photo-interrupter composed of a light projecting part and a light receiving part which are opposed to each other. Terminal parts 15 a to 15 d are connected to the light projecting part and light receiving part. The photo-interrupter 15 is interposed in between the first motor case 9 and the second motor case 10 and is secured to the motor cases 9 and 10 by bonding or the like. The photo-interrupter 15 is thus set in the neighborhood of the peripheral end of a space between the annular base plate 11 and the cam plate 12.
The photo-interrupter 15 is arranged to detect that the diaphragm blades 13 are at a full-open position, when the projection (light-blocking part) 14 d provided on the periphery of the rotary ring 14 comes into a space between the light projecting part and the light receiving part to block detection light projected from the light projecting part to the light receiving part.
Reference numeral 16 denotes a flexible printed circuit board to which the terminals 7 a and 7 b of the first coil 7, the terminals 8 a and 8 b of the second coil 8 and the terminals 15 a to 15 d of the photo-interrupter 15 are connected by soldering.
As is apparent from FIG. 8, the terminals 7 a and 7 b of the first coil 7, the terminals 8 a and 8 b of the second coil 8 and the terminals 15 a to 15 d of the photo-interrupter 15 all extend in about the same direction. The extending direction of these terminals orthogonally intersects the direction of the optical axis, in which the annular base plate 11, the rotary ring 14 and the cam plate 12 are arranged. In soldering the terminals 7 a, 7 b, 8 a, 8 b and 15 a to 15 d to the flexible printed circuit board 16, therefore, all of them can be soldered at the same time without incurring any increase in the number of assembly processes. The arrangement also effectively prevents any increase in size of the flexible printed circuit board 16. The flexible printed circuit board 16 is electrically connected to a motor driving control circuit board which is not shown.
Motor driving steps are arranged to be repeated as many times as the number of exciting pulses are supplied to the terminals 7 a, 7 b, 8 a and 8 b of the coils 7 and 8 from the motor driving control circuit board through the flexible printed circuit board 16.
The operation of the diaphragm device B which acts by receiving a driving force from the stepping motor A is next described as follows. When the stepping motor A rotates, its output is transmitted through the gear 1 c to the gear part 14 c of the rotary ring 14. This causes the rotary ring 14 to rotate by a predetermined angle. The rotation of the rotary ring 14 then causes the surface dowels 13 b of the diaphragm blades 13 to move in the direction of the rotation.
Then, the diaphragm cams 12 a provided in the cam plate 12 act to cause the dowels 13 a on the reverse sides of the diaphragm blades 13 to swing either in the opening or closing direction to open or close the aperture of the diaphragm. By this operation, an exposure is adjusted for photo-taking by the camera.
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