JP2008096945A - Shielding member actuating device, imaging lens and photographing device for camera - Google Patents

Abstract

Provided is a light-shielding member actuating device that can effectively use space of a unit, can reduce the height of an engine unit, and can increase the initial rotation speed and initial rotation torque of a rotor.
An actuator according to the present invention includes a motor 110 rotatably supported with respect to a case, a cylindrical yoke 120 disposed with a gap around a rotor, and a rotor 110 and a yoke 120. And the magnetic plate 140 for positioning the rotor. The magnetic plate 140 is provided with respect to the yoke 120. Shutter blades 220 and 222 constituting a light shielding member and a diaphragm plate 230 are provided so as to rotate based on the rotation of the rotor 110.
[Selection] Figure 1

Description

  The present invention relates to a light shielding member operating device for a camera, that is, a shutter device and a diaphragm device. In particular, the present invention relates to a shutter device and a diaphragm device including an electromagnetic actuator that generates a driving force by an electromagnetic force. The present invention also relates to an imaging lens and a photographing apparatus including a light shielding member actuating device that is actuated by an electromagnetic actuator.

  24 and 25, a conventional electromagnetic actuator 800 for a shutter device includes a rotor 802 made of a permanent magnet, a coil 810 that rotates the rotor 802, and an elastic spring that holds the rotor 802 at an intermediate position by an elastic force. A member 820, a magnetic pin 830 that holds the rotor 802 in one end position, and a cylindrical yoke 840 that forms a magnetic path around the rotor 802 are provided. The coil 810 is wound around the coil bobbin 812 so as to cross the central axis of the rotor 802. Rotor 802 includes a cylindrical permanent magnet 804 having an N pole and an S pole, and a rotor shaft 806 fixed to the center hole of permanent magnet 804. An operating lever 850 is fixed to one end of the rotor shaft 806. The drive pin 852 is fixed to the operation lever 850.

  Referring to FIG. 24, the rotor 802 can rotate within the range of the angle DRT by passing a current through the coil 810. When no current is passed through the coil 810, the operating lever 850 stops at an intermediate position indicated by “850A”. At this time, the N pole and the S pole of the permanent magnet 804 are located closest to the inner peripheral portion of the coil 810. By causing a current in one direction to flow through the coil 810, the rotor 802 rotates by a constant angle in the counterclockwise direction, and the operating lever 850 stops at the first operating position indicated by “850B”. By causing a current in the direction opposite to the one direction to flow through the coil 810, the rotor 802 rotates by a certain angle in the clockwise direction, and the operating lever 850 stops at the second operating position indicated by “850C”. . As the rotor 802 rotates and the drive pin 852 rotates, a shutter device (not shown) and a diaphragm device (not shown) connected to the drive pin 852 operate (see Patent Document 1). ).

  Another conventional electromagnetic actuator (not shown) includes a rotor made of a permanent magnet, a coil wound around a position passing through the central axis of the rotor, and the rotor rotating in the same direction with respect to the rotor. It has the 1st magnetic pin and 2nd magnetic pin which exert rotational urging | biasing force, and the yoke which forms a magnetic path around a rotor (refer patent document 2).

JP 2001-142111 A (FIGS. 1 to 3) Japanese Patent Laying-Open No. 2003-188953 (FIG. 1)

  The conventional electromagnetic actuator has a structure in which a coil is wound in a direction parallel to the rotation axis of the magnet rotor in order to effectively use a portion where the magnetic flux density of the magnet portion is the highest. The coil is disposed with respect to the magnet rotor so that the center of the coil winding width passes through the rotation axis of the magnet rotor in a direction orthogonal to the center line of the rotatable angle range of the magnet rotor. Here, a portion that includes a magnet rotor, a yoke, a coil, and the like and generates a driving force on the output shaft is referred to as an “engine portion”.

  However, in such a conventional coil winding method, a shutter blade driving lever that is attached vertically to the rotating shaft of the magnet rotor or is integrated with the rotating shaft of the magnet rotor extends the rotating shaft of the rotor. It was not possible to place it at the position in the specified direction. For this reason, in the conventional electromagnetic actuator, the subject that the space in a lens unit cannot be utilized effectively occurred. Further, in the conventional electromagnetic actuator, it is difficult to increase the initial rotation speed of the rotor, and it is difficult to increase the initial rotation torque of the rotor. Furthermore, the conventional electromagnetic actuator has a problem that it is difficult to reduce the height of the engine unit because the coils are attached in the vertical direction of the rotating shaft of the magnet rotor.

An object of the present invention is to provide a light-shielding member actuating device configured so that the space in the lens unit can be effectively used and the height of the engine unit can be reduced.
Another object of the present invention is to provide a light-shielding member actuating device configured to increase the initial rotation speed of the rotor and to increase the initial rotation torque of the rotor.
Still another object of the present invention is to provide a light-shielding member actuating device configured so that the rotor can be reliably held at the stop position when no current is supplied to the coil.
Still another object of the present invention is to provide a light-shielding member actuating device configured so that parts can be easily manufactured and assembled.
Still another object of the present invention is to provide an imaging lens and an imaging device including a light shielding member actuating device having the above characteristics.

The present invention provides a light-shielding member operating device for a camera, comprising a rotor having a rotation center axis, and the rotor is magnetized to two poles of N and S with reference to a magnetic pole boundary surface including the rotation center axis. The rotor is supported rotatably with respect to the case.
Furthermore, the light-shielding member operating device of the present invention includes a cylindrical yoke formed of a magnetic material, and the yoke is disposed around the rotor with a gap. Furthermore, the light-shielding member actuating device of the present invention includes a coil disposed between the rotor and the yoke, and rotor positioning means made of a magnetic material. The rotor positioning means is provided for the yoke. The light-shielding member actuating device of the present invention further includes a light-shielding member provided to rotate based on the rotation of the rotor. With this configuration, the space in the lens unit can be used effectively, and the height of the engine unit can be reduced.

  In the light shielding member actuating device of the present invention, it is preferable that the coil is formed to be curved along the inner peripheral portion of the yoke. In the light-shielding member actuating device of the present invention, it is preferable that the coil includes two linear portions arranged in parallel to the rotation center axis of the rotor. In this configuration, it is preferable that the rotor positioning means is disposed at a position inside the two linear portions of the coil and inside the yoke. The light shielding member actuating device of the present invention further includes an actuating member for rotating the light shielding member based on the rotation of the rotor, and the center of the coil is at an intermediate position in a range where the actuating member rotates. It is good to arrange | position on the plane containing the said magnetic pole boundary plane of the said rotor. The light shielding member actuating device of the present invention further includes an actuating member for rotating the light shielding member based on the rotation of the rotor, and the magnetic flux density of the magnetic pole of the rotor in a state where the actuating member is rotated is the maximum. The outer peripheral portion of the rotor may be arranged so as to face one of the linear portions of the coil with a gap. With this configuration, the initial rotation speed of the rotor can be increased, and the initial rotation torque of the rotor can be increased.

  In the light-shielding member actuating device of the present invention, the rotor positioning means is composed of a U-shaped magnetic plate, and the two tip portions of the magnetic plate are respectively spaced from the outer peripheral portion of the rotor. Are preferably arranged so as to face each other. With this configuration, the rotor can be reliably held at the stop position when no current is supplied to the coil. In the light shielding member actuating device of the present invention, the rotor positioning means can be constituted by an inner wall portion of the yoke formed so as to be closer to the rotor than a cylindrical portion of the yoke. This configuration facilitates part manufacture and assembly. The rotor positioning means is composed of one or a plurality of magnetic pins disposed inside the coil inside the cylindrical portion of the yoke, and a side surface of the magnetic pin is a gap with respect to an outer peripheral portion of the rotor Can be arranged so as to face each other. With this configuration, the rotor can be reliably held at the stop position when no current is supplied to the coil.

Further, in the light shielding member actuating device of the present invention, a first cylindrical portion having a large inner diameter and a second cylindrical portion having a smaller inner diameter than the inner diameter of the first cylindrical portion are formed on the yoke, and the rotor positioning means The second cylindrical portion of the yoke formed so as to be closer to the rotor than the first cylindrical portion of the yoke.
Furthermore, in the light-shielding member actuating device of the present invention, the first cylindrical portion having a small inner diameter is formed on the yoke on the side where the first coil is present, and the first cylindrical portion having a small inner diameter on the side where the second coil is present. Two cylindrical portions are formed on the yoke, and the first cylindrical portion of the first cylindrical portion is connected to one end of the first cylindrical portion and one end of the second cylindrical portion. A third cylindrical portion having a larger inner diameter than the inner diameter is provided on the yoke, and connects the other end of the first cylindrical portion and the other end of the second cylindrical portion, A fourth cylindrical portion having an inner diameter larger than the inner diameter of the first cylindrical portion is provided in the yoke, and a first boundary inner wall portion is provided between the first cylindrical portion and the fourth cylindrical portion. Formed between the fourth cylindrical portion and the second cylindrical portion. A boundary inner wall portion is formed, a third boundary inner wall portion is formed between the third cylindrical portion and the second cylindrical portion, and the first cylindrical portion and the third cylindrical portion are A fourth boundary inner wall portion may be formed therebetween, and the four boundary inner wall portions may constitute a means for positioning the rotor. This configuration facilitates part manufacture and assembly.

  Furthermore, the light-shielding member actuating device of the present invention includes an actuating member for rotating the light-shielding member based on the rotation of the rotor, and the operating part for applying a force to the light-shielding member by the actuating member It is good to arrange | position on the plane containing a magnetic pole boundary plane. Furthermore, the light-shielding member actuating device of the present invention includes an actuating member for rotating the light-shielding member based on the rotation of the rotor, and the actuating member is fixed to an end portion of the central axis of the rotor. Good. In the light-shielding member operating device of the present invention, in the configuration in which the curved air-core coil is disposed between the yoke and the rotor, the rotating shaft portion of the rotor can be extended, and the engine portion and the shutter blade chamber portion are disposed apart from each other. This makes it possible to effectively use the space in the lens unit. The light-shielding member actuating device of the present invention can further be configured to include a drive circuit for generating a magnetic field for causing the current to flow through the coil and rotating the rotor. With this configuration, it is possible to realize a light shielding member actuating device in which the initial rotation speed of the rotor is high and the initial rotation torque of the rotor is large.

  According to the present invention, in the light shielding member operating device for a camera, a rotor having a rotation center axis is provided, and the rotor is attached to two poles of N pole and S pole on the basis of a magnetic pole boundary surface including the rotation center axis. The rotor includes a magnetized rotor magnet, and the rotor is rotatably supported with respect to the case. The light-shielding member operating device of the present invention further includes a cylindrical yoke formed of a magnetic material, and the yoke is disposed around the rotor with a gap. The light shielding member actuating device of the present invention further includes two coils disposed between the rotor and the yoke, and rotor positioning means formed of a magnetic material, and the rotor positioning means includes: It is arranged inside each hole and at a position inside the yoke. The light-shielding member actuating device of the present invention further includes a light-shielding member provided to rotate based on the rotation of the rotor. In such a configuration in which two coils are provided, the magnetic force generated by the two coils can be used effectively, the rotor can be rotated at a higher speed, and the shutter speed can be further increased. .

  Furthermore, the present invention may be configured such that an imaging lens including an optical system includes the light shielding member actuating device, and the light shielding member is a diaphragm blade or a shutter blade. According to the present invention, in the imaging lens including an optical system, the light shielding member actuating device includes two of the light shielding member actuating devices, and one of the light shielding member actuating devices is a diaphragm blade. The other light shielding member can be configured to be a shutter blade. With this configuration, an imaging lens capable of increasing the shutter speed can be realized.

  Furthermore, the present invention provides a photographing apparatus having an imaging lens including an optical system, including the light shielding member operating device, wherein the light shielding member is a diaphragm blade or a shutter blade, and the light shielding member. A drive circuit for generating a magnetic field for causing a current to flow through the coil of the actuator and rotating the rotor of the light shielding member actuator may be provided. Furthermore, the present invention provides a photographing apparatus having an imaging lens including an optical system, including two of the light shielding member operating devices, wherein one of the light shielding member operating devices is a diaphragm blade, and the light shielding The other light shielding member of the member actuating devices is a shutter blade, and causes current to flow through the respective coils of the two light shielding member actuating devices to rotate the respective rotors of the two light shielding member actuating devices. A drive circuit for generating a magnetic field can be provided. With this configuration, it is possible to realize an imaging apparatus including an imaging lens capable of increasing the shutter speed.

  In the light-shielding member actuating device of the present invention, the coil is disposed between the cylindrical yoke and the rotor so that when the rotor is at a stationary position, it faces the portion where the magnetic flux density of the magnet of the rotor is the highest. The coil portion is arranged in Therefore, the magnetic force can be used most efficiently when the coil is energized. Furthermore, the initial rotation speed of the rotor can be increased, and the initial rotation torque of the rotor can be increased. In the light shielding member operating device of the present invention, when the rotor is rotated from the stationary position and the rotor magnetic pole boundary surface passes the center line of the rotatable angular range of the rotor, the magnetic flux density of the rotor magnet is first set. The portion of the coil opposite to the portion of the coil facing the largest is exerting a strong magnetic attractive force on the magnet of the rotor, and the rotation of the rotor can be further accelerated. With such a configuration, in the light shielding member operating device of the present invention, the rotor can be rotated at a high speed, and the shutter speed can be increased.

  Furthermore, in the light-shielding member operating device of the present invention, in the configuration in which two coils are arranged between the yoke and the rotor, the magnetic force generated by the two coils can be used effectively, and the rotor can be rotated at a higher speed. Therefore, the shutter speed can be further increased. Furthermore, in the light-shielding member actuating device of the present invention, the rotor can be reliably held at the stop position when no current is supplied to the coil. Moreover, in the light-shielding member operating device of the present invention, the rotor can be reliably held at the stop position without newly adding a magnetic member. Therefore, the light shielding member actuating device of the present invention is easy to manufacture and assemble parts. Furthermore, in the light shielding member operating device of the present invention, the height of the engine portion can be lowered by using the curved air-core coil. Further, in the light shielding member operating device of the present invention, in the configuration in which the curved air-core coil is disposed between the yoke and the rotor, the rotating shaft portion of the rotor can be extended, and the engine portion and the shutter blade chamber portion are separated from each other. The space in the lens unit can be used effectively.

  Embodiments of the present invention will be described below with reference to the drawings. In the present invention, the light shielding member actuating device for a camera is a device that actuates a shutter in a still camera, a video camera, a movie camera, a surveillance camera, a digital camera, a camera-equipped electronic device (such as a mobile phone), and a diaphragm. It is a concept that includes a device to be operated.

(1) First embodiment:
First, a first embodiment of the present invention will be described. 1 to 4, in the first embodiment of the present invention, the engine unit 100 of the light-shielding member operating device of the present invention includes a rotor 110 and a yoke 120 disposed around the rotor 110 with a gap. A coil 130 disposed between the rotor 110 and the yoke 120, a magnetic plate 140 provided on the yoke 120, an upper case 150, and a lower case 154 are provided. The rotor 110 has a rotation center axis 110A. Coil 130 is formed of an air-core coil. The rotor 110, the yoke 120, the coil 130, and the like constitute an engine unit 100 for generating a rotational force on the light shielding member. The rotor 110 includes a rotor magnet 112 formed in a cylindrical shape, and a rotor shaft 114 fixed to the center hole of the rotor magnet 112. The rotor magnet 112 is magnetized into two poles, an N pole and an S pole, with a magnetic pole boundary surface 112F including the rotation center axis 110A as a reference. An upper end shaft portion of the rotor shaft 114 is supported to be rotatable with respect to the upper case 150. A lower end shaft portion of the rotor shaft 114 is supported to be rotatable with respect to the lower case 154. With this configuration, the space in the lens unit can be used effectively, and the height of the engine unit can be reduced.

  The yoke 120 is formed in a cylindrical shape from a magnetic material such as electromagnetic soft iron. The yoke 120 is fixed to the upper case 150 and the lower case 154. The magnetic plate 140 constitutes rotor positioning means for determining the position of the rotor 110. The magnetic plate 140 is formed in a U shape with a magnetic material such as electromagnetic soft iron. The magnetic plate 140 is fixed to the yoke 120 such that the two tip portions 141 and 142 of the magnetic plate 140 penetrate the yoke 120. The two tip portions 141 and 142 of the magnetic plate 140 are disposed so as to face the outer peripheral portion of the rotor 110 with a gap, respectively. With this configuration, the rotor can be reliably held at the stop position when no current is supplied to the coil.

  The operation member 160 is fixed to the lower shaft portion of the rotor 110. The operating member 160 is provided to rotate a light shielding member (not shown: described later) such as a shutter and a diaphragm based on the rotation of the rotor 110. The operation member 160 includes an operation lever 162 and an operation pin 164. The action part (that is, the contact part of the light shielding member with the actuating pin 164) where the actuating member 160 applies a force to the light shielding member is preferably disposed on a plane including the magnetic pole boundary plane 112F of the rotor magnet 112. The operating member 160 is configured to operate within the range of the angle DPT shown in FIG. The rotatable angle range of the actuating member 160 can be determined by the determining portions 154C and 154D that come into contact with the actuating lever 162. Two degree determining portions 154C and 154D are provided in the lower case 154.

  Referring to FIG. 5, the coil 130 is configured to include two straight portions. The coil 130 includes an upper portion 131, a first side portion 132, a second side portion 133, and a lower portion 134, each of which is continuously wound with a coil wire. The coil 130 is formed in a rectangular shape as a whole, and the center hole 130C is located in the four portions. The first side portion 132 and the second side portion 133 may be formed as straight portions that are parallel to each other. The coil 130 may be formed to be curved along the inner periphery of the yoke 120. That is, the upper portion 131 and the lower portion 134 of the coil 130 are preferably formed in an arc shape so as to match the shape (curvature) of the inner peripheral portion of the yoke 120.

  Referring to FIGS. 1 and 2, the coil 130 is configured to include two straight portions arranged in parallel to the rotation center axis 110 </ b> A of the rotor 110, that is, a first side portion 132 and a second side portion 133. It is good to be done. Or the coil 130 can also be comprised by shapes, such as circular, an ellipse, and an oval, as a whole. The coil opening angle formed by the central portion of the first side portion 132 and the central portion of the second side portion 133 around the rotation center axis 110A of the rotor 110 is preferably 100 degrees to 140 degrees. The coil opening angle is particularly preferably 120 degrees. For example, the outer diameter DR of the rotor magnet 112 can be formed to 2.5 mm. For example, the thickness HR of the rotor magnet 112 can be formed to 4 mm. For example, the outer diameter DY of the yoke 120 can be formed to 5 mm. For example, the thickness HY of the yoke 120 can be formed to 4.5 mm. For example, the radius RC of the inner surface of the coil 130 can be formed to 1.5 mm. For example, the coil 130 can be formed in 150 turns using 60 micron copper wire.

  Referring to FIG. 4, the center of the coil 130 is disposed on a plane including the magnetic pole boundary plane 112 </ b> F when the rotor 110 is located at an intermediate position in the angular range in which the rotor 110 rotates. An N-pole center 112 </ b> N indicated by a white circle in FIG. 4 is a location where the center position of the N-pole of the rotor magnet 112 or the magnetic flux density of the N-pole of the rotor magnet 112 is the highest. In addition, the south pole center 112S indicated by a black circle in FIG. 4 is a position where the center position of the south pole of the rotor magnet 112 or the magnetic flux density of the south pole of the rotor magnet 112 is the highest. With this configuration, the initial rotation speed of the rotor can be increased, and the initial torque of the rotation of the rotor 110 can be increased.

  Referring to FIG. 4A, the outer peripheral portion of the rotor magnet 112 where the magnetic flux density of the south pole of the magnetic pole of the rotor magnet 112 is maximum, that is, the center of the south pole, in the state where the operation member 160 is rotated clockwise. 112S is arranged so as to face one of the straight portions of the coil 130, that is, the first side portion 132 with a gap. In this state, the south pole center 112 </ b> S is located at a position close to the one end portion 142 of the magnetic plate 140. Therefore, the rotor 110 is held at the position shown in FIG. 4A by the magnetic force exerted by the south pole of the rotor magnet 112 on the tip portion 142 of the magnetic plate 140.

  Referring to FIG. 4B, in the state where the operation member 160 is rotated counterclockwise, the outer peripheral portion of the rotor magnet 112 where the magnetic pole density of the magnetic pole of the rotor magnet 112 is maximum, that is, the N pole. The center 112N is disposed so as to face the other of the straight portions of the coil 130, that is, the second side portion 133 with a gap. In this state, the N-pole center 112 </ b> N is located at a position close to the other tip portion 142 of the magnetic plate 140. Therefore, the rotor 110 is held at the position shown in FIG. 4B by the magnetic force exerted by the N pole of the rotor magnet 112 on the tip portion 141 of the magnetic plate 140.

  Referring to FIG. 4A, in the state where the rotor 110 is rotated and held in the clockwise direction, the magnetic field generated by the rotor magnet 112 is N poles of the rotor magnet 112 as shown by a thick arrow in the figure. The direction is to exit from S and enter S pole. In this state, when a current from the back side to the front side of the paper is applied to the first side portion 132 of the coil 130 (indicated by a black circle in the drawing), the Fleming is affected by the influence of the magnetic field of the south pole of the rotor magnet 112. In accordance with the left hand rule, a clockwise force acts on the first side portion 132 of the coil 130. Therefore, the counterclockwise rotational force acts on the south pole of the rotor magnet 112 by the reaction of the clockwise force. In addition, a current flowing from the front side to the back side of the paper surface flows through the second side portion 133 of the coil 130 (indicated by a cross in the drawing), and similarly to the influence of the magnetic field of the south pole of the rotor magnet 112, the rotor Due to the influence of the magnetic field of the N pole of the magnet 112, a clockwise force acts on the second side portion 133. Therefore, a counterclockwise rotational force acts on the north pole of the rotor magnet 112 due to the reaction of the clockwise force. Therefore, a counter-clockwise couple acts on the rotatable rotor 110, and the rotor 110 rotates counterclockwise to the position shown in FIG. 4B and is held in that state. The

  Referring to FIG. 4B, when the rotor 110 is rotated and held in the counterclockwise direction, the magnetic field generated by the rotor magnet 112 is N of the rotor magnet 112 as indicated by a thick arrow in the figure. The direction is to exit from the pole and enter the S pole. In this state, if a current from the back side to the front side of the paper is applied to the second side portion 133 of the coil 130 (indicated by a black circle in the figure), the Fleming is affected by the influence of the N pole magnetic field of the rotor magnet 112. In accordance with the left hand rule, a counterclockwise force is applied to the second side portion 133 of the coil 130. Therefore, a counterclockwise rotational force causes a clockwise rotational force to act on the north pole of the rotor magnet 112. In addition, a current flowing from the front side to the back side of the paper surface flows in the first side portion 132 of the coil 130 (indicated by a cross in the drawing), and similarly to the influence of the magnetic field of the N pole of the rotor magnet 112, the rotor Due to the influence of the magnetic field of the south pole of the magnet 112, a counterclockwise force acts on the first side portion 132. Therefore, a counterclockwise rotational force causes a clockwise rotational force to act on the north pole of the rotor magnet 112. Accordingly, a clockwise couple acts on the rotatable rotor 110, and the rotor 110 rotates in the clockwise direction to the position shown in FIG. 4A and is held in that state.

  Referring to FIG. 6, when assembling the engine unit 100 of the light shielding member operating device, for example, the lower shaft portion of the rotor 110 is disposed in the rotor bearing hole of the lower case 154. Next, the upper shaft portion of the rotor 110 is disposed in the rotor bearing hole of the upper case 150, and the upper case 150 and the lower case 154 are fixed. Thereby, the rotor 110 is rotatably supported with respect to the upper case 150 and the lower case 154. Next, the coil 130 is disposed on the upper case 150. Next, the yoke 120 is disposed on the outer periphery of the upper case 150. Next, the magnetic plate 140 is fixed to the yoke 120.

Referring to FIGS. 7 and 12, the light-shielding member actuating device 200 of the present invention is based on the shutter base plate 210 constituting the substrate of the device, the first engine unit 180 fixed to the shutter base plate 210, and the shutter base plate 210. A first shutter blade 220 configured to rotate based on rotation of the rotor 110 of the first engine unit 180, and to be rotatably supported with respect to the shutter base plate 210, and And a second shutter blade 222 configured to rotate based on the rotation of the rotor 110 of the first engine unit 180.
Further, the light shielding member operating device 200 is supported so as to be rotatable with respect to the second engine unit 182 fixed to the shutter base plate 210 and the shutter base plate 210, and the rotor 110 of the second engine unit 182 is rotated. A diaphragm plate 230 configured to rotate on the basis thereof, a separator plate 240 for separating the shutter blade and the diaphragm plate, and a blade chamber cover 250 fixed to the shutter base plate 210 for holding the diaphragm plate 230. Is provided.

  Referring to FIG. 7, the first shutter blade 220 and the second shutter blade 222 are a first light shielding member (that is, a light shielding member) provided to rotate based on the rotation of the rotor 110 of the first engine unit 180. Member). The diaphragm plate 230 constitutes a second light shielding member (that is, a transmitted light amount adjusting member) provided to rotate based on the rotation of the rotor 110 of the second engine unit 182. The first shutter blade 220 and the second shutter blade 222 are disposed between the diaphragm plate 230 and the shutter base plate 210. Alternatively, the diaphragm plate 230 may be arranged between the first shutter blade 220, the second shutter blade 222, and the shutter base plate 210. Each of the first engine unit 180 and the second engine unit 182 can be configured in the same manner as the engine unit 100 described above. That is, each of the first engine unit 180 and the second engine unit 182 includes the rotor 110, the yoke 120, the coil 130, the magnetic plate 140, the upper case 150, and the lower case 154.

  With reference to FIGS. 8 and 12, a circular shutter opening 216 is provided in the shutter base plate 210. The shutter opening 216 has an opening center axis 216A. The first shutter blade 220 is configured to be rotatable with respect to the first shutter blade pin 211 provided on the shutter base plate 210. The second shutter blade 222 is configured to be rotatable with respect to the second shutter blade pin 212 provided on the shutter base plate 210. When the rotor 110 of the first engine unit 180 is rotated counterclockwise, the shutter opening 216 is completely shielded by the first shutter blade 220 and the second shutter blade 222. 8 to 11, the second coil and the second magnetic plate in the second embodiment are illustrated by imaginary lines.

  Referring to FIG. 9, in a state where the rotor 110 of the first engine unit 180 rotates in the clockwise direction, the first shutter blade 220 and the second shutter blade 222 are moved so as not to block the shutter opening 216. Yes.

Referring to FIG. 10, a circular diaphragm opening 236 is provided in the diaphragm plate 230. The aperture area of the aperture 236 can be set to correspond to the required aperture value.
The diaphragm plate 230 is configured to be rotatable with respect to a diaphragm plate pin 218 provided on the shutter base plate 210. When the rotor 110 of the second engine unit 182 is rotated in the clockwise direction, the diaphragm plate 230 is moved to a position away from the shutter opening 216.

  Referring to FIG. 11, in a state where the rotor 110 of the second engine unit 182 rotates counterclockwise, the diaphragm plate 230 is arranged such that the diaphragm opening 236 of the diaphragm plate 230 is positioned in the shutter opening 216. Has been moved. In this state, it is preferable that the center of the aperture opening 236 coincides with the center of the shutter opening 216.

  In the embodiment of the present invention described above, the first shutter blade 220 and the second shutter blade 222 can be operated by the first engine unit 180, and the diaphragm plate 230 can be operated by the second engine unit 182. Although the configured light shielding member actuating device 200 has been illustrated and described, the present invention is configured to include only one engine unit 180, thereby operating the first shutter blade 220 and the second shutter blade 222. Alternatively, it may be configured to include only one engine portion 182 and thereby operate the diaphragm plate 230.

  Referring to FIG. 13, the imaging lens 250 equipped with the light blocking member operating device 200 of the present invention includes a lens barrel portion 252, a front group lens system 254, a rear group lens system 256, and a mount portion 258. The front group lens system 254 and the rear group lens system 256 have a common optical axis 250A. The light blocking member operating device 200 is incorporated between the front group lens system 254 and the rear group lens system 256. The opening center axis 216A of the shutter opening 216 is disposed so as to coincide with the optical axis 250A. Furthermore, in the present invention, an imaging lens 250 can be attached to a camera body (not shown) to constitute an imaging device such as a still camera or a digital camera.

  Referring to FIG. 14A, in the light shielding member operating device 200 of the present invention, the shutter driving circuit 270 that drives the first engine unit 180 and operates the first shutter blade 220 and the second shutter blade 222 is a microcomputer. 272 and a shutter drive driver 274. The shutter drive driver 274 receives a drive signal output from the microcomputer 272 and causes a current to flow from the output terminals 1 and 2 to the coil 130 provided in the shutter unit 276 to generate a magnetic field for rotating the rotor 110. . The shutter drive circuit that drives the second engine unit 182 to operate the diaphragm plate 230 can be configured in the same manner as the shutter drive circuit 270.

  The drive circuit 270 can also be disposed on the imaging lens 250. Alternatively, the drive circuit 270 can be provided in a camera control IC of the camera body. Alternatively, in the surveillance camera, the drive circuit 270 can be provided in a personal computer for camera control.

  Referring to FIG. 15, the camera-equipped electronic device 300 on which the light blocking member operating device 200 of the present invention is mounted includes a main body 310, a front group lens system 312, a rear group lens system 314, a diaphragm operating device 320, and a shutter operation. It includes an apparatus 322, an image sensor 330 that receives an image of a subject, a control circuit 332 that controls the operation of the apparatus, and an image data storage member 334. The image sensor 330 can be constituted by, for example, a CCD. The image data storage member 334 is configured by a memory card such as a RAM card, for example.

  The diaphragm operating device 320 is supported by a diaphragm base plate constituting the substrate of the apparatus, a diaphragm engine unit fixed to the diaphragm base plate, and a shutter base plate so as to be rotatable, and the rotation of the rotor 110 of the diaphragm engine unit. , And a diaphragm blade chamber cover fixed to the diaphragm base plate to hold the diaphragm plate 230.

  The shutter operating device 322 is supported by a shutter base plate constituting the substrate of the device, a shutter engine unit fixed to the shutter base plate, and rotatable with respect to the shutter base plate, and the rotation of the rotor 110 of the shutter engine unit. The first shutter blade 220 is configured to rotate based on the rotation of the shutter, and is rotatably supported with respect to the shutter base plate 210, and is configured to rotate based on the rotation of the rotor 110 of the shutter engine unit 180. The second shutter blade 222 and a shutter blade chamber cover fixed to the shutter base plate for holding the first shutter blade 220 and the second shutter blade 222 are provided.

  The front group lens system 312 and the rear group lens system 314 have a common optical axis 312A. The aperture actuator 320 is incorporated between the front group lens system 312 and the rear group lens system 314. The shutter operating device 320 is incorporated between the rear group lens system 314 and the image sensor 330. The camera-equipped electronic device can be configured as a mobile phone, for example.

  The central axis of the shutter opening of the shutter operating device 322 is arranged to coincide with the optical axis 312A. The central axis of the aperture opening of the aperture actuating device 320 is arranged to coincide with the optical axis 312A. The image sensor 330 is arranged at a position where an image of the subject converged by the front group lens system 312 and the rear group lens system 314 is formed.

  The control circuit 332 is configured to cause a current to flow through the coil 130 of the aperture actuator 320 and generate a magnetic field for rotating the rotor 110 of the aperture actuator 320. Further, the control circuit 332 is configured to cause a current to flow through the coil 130 of the shutter operating device 322 and generate a magnetic field for rotating the rotor 110 of the shutter operating device 322. Based on the operation signal output from the control circuit 332, the diaphragm operating device 320 and the shutter operating device 322 are operated, and data relating to the image of the subject incident on the image sensor 330 can be stored in the image data storage member 334.

(2) Second embodiment:
Next, a second embodiment of the present invention will be described. In the following description, the difference between the second embodiment of the present invention and the first embodiment of the present invention will be mainly described. Therefore, the description of the first embodiment of the present invention described above applies mutatis mutandis to the portions not described below.

  Referring to FIGS. 16 to 19, in the second embodiment of the present invention, the engine unit 400 of the light-shielding member operating device of the present invention includes a rotor 410, a yoke 420 disposed with a gap around the rotor, First coil 430 and second coil 434 arranged between rotor 410 and yoke 420, first magnetic plate 440 and second magnetic plate 444 provided on yoke 420, upper case 450, and lower case 454 With. The first coil 430 and the second coil 434 are air core coils. The rotor 410 has a rotation center axis 410A. The rotor 410, the yoke 420, the first coil 430, the second coil 434, and the like constitute an engine unit 400 for generating a rotational force on the light shielding member. The rotor 410 has a rotor magnet 412 formed in a cylindrical shape, and a rotor shaft 414 fixed to the center hole of the rotor magnet 412. The rotor magnet 412 is magnetized to two poles, an N pole and an S pole, with a magnetic pole boundary surface 412F including the rotation center axis 410A as a reference.

  The first magnetic plate 440 and the second magnetic plate 444 constitute rotor positioning means for determining the position of the rotor 410. The first magnetic plate 440 and the second magnetic plate 444 are formed in a U shape using a magnetic material such as electromagnetic soft iron. The first magnetic plate 440 is fixed to the yoke 420 such that the two tip portions 441 and 442 of the first magnetic plate 440 pass through the yoke 420. The two tip portions 441 and 442 of the first magnetic plate 440 are arranged so as to face the outer peripheral portion of the rotor 410 with a gap, respectively. The second magnetic plate 444 is fixed to the yoke 120 such that the two tip portions 445 and 446 of the second magnetic plate 444 pass through the yoke 420. The two tip portions 445 and 446 of the second magnetic plate 444 are arranged so as to face the outer peripheral portion of the rotor 410 with a gap, respectively.

  The first coil 430 and the second coil 434 are configured and arranged in the same shape as the coil 130 described above. The first coil 430 and the second coil 434 are preferably configured symmetrically with respect to a plane perpendicular to the magnetic pole boundary surface 412F when the rotor 410 is at an intermediate position in the rotatable angular range of the rotor 410. The first magnetic plate 440 and the second magnetic plate 444 are configured symmetrically with respect to a plane perpendicular to the magnetic pole boundary surface 412F when the rotor 410 is at an intermediate position in the rotatable angular range of the rotor 410. Good. The operating member 460 is fixed to the lower shaft portion of the rotor 410. The actuation member 460 includes an actuation lever 462 and an actuation pin 464.

  Referring to FIG. 19, the center of the first coil 430 is disposed on a plane including the magnetic pole boundary plane 412 </ b> F when the rotor 410 is located at an intermediate position in the angular range in which the rotor 410 rotates. The center of the second coil 434 is disposed on a plane including the magnetic pole boundary plane 412F when the rotor 410 is at an intermediate position in the angular range in which the rotor 410 rotates. An N-pole center 412N indicated by a white circle in FIG. 19 is a position where the center position of the N-pole of the rotor 410 or the magnetic flux density of the N-pole of the rotor 410 is the highest. Further, the S pole center 412 </ b> S indicated by a black circle in FIG. 19 is a position where the center position of the S pole of the rotor 410 or the magnetic flux density of the S pole of the rotor 410 is the highest.

Referring to FIG. 19A, in the state where the operation member 460 is rotated in the clockwise direction, the outer peripheral portion of the rotor 410 where the magnetic flux density of the S pole of the magnetic pole of the rotor 410 is maximum, that is, the S pole center 412S is The first coil 430 is disposed so as to face one of the straight portions of the first coil 430 with a gap. In this state, the south pole center 412 </ b> S is located at a position close to one end portion 442 of the first magnetic plate 440. In this state, the outer peripheral portion of the rotor 410 where the magnetic flux density of the N pole of the magnetic pole of the rotor 410 is maximum, that is, the N pole center 412N is opposed to one of the straight portions of the second coil 434 with a gap. Be placed. In this state, the N-pole center 412N is located at a position close to one end portion 446 of the second magnetic plate 444.
Accordingly, the rotor 410 is configured as shown in FIG. 19 (FIG. 19) by the magnetic force exerted by the S pole of the rotor 410 on the tip portion 442 of the first magnetic plate 440 and the magnetic force exerted on the tip portion 446 of the second magnetic plate 444. It is held at the position shown in a).

  Referring to FIG. 19B, in the state where the operation member 460 is rotated in the counterclockwise direction, the outer peripheral portion of the rotor 410 where the magnetic flux density of the south pole of the rotor 410 is the maximum, that is, the south pole center 412S. Is arranged to face the other of the straight portions of the second coil 434 with a gap. In this state, the south pole center 412 </ b> S is located at a position close to the other tip 445 of the second magnetic plate 444. In this state, the outer peripheral portion of the rotor 410 where the magnetic flux density of the N pole of the magnetic pole of the rotor 410 is the maximum, that is, the N pole center 412N is opposed to the other linear portion of the first coil 430 with a gap. Be placed. In this state, the N-pole center 412N is at a position close to the other tip 441 of the first magnetic plate 440. Accordingly, the rotor 410 is configured as shown in FIG. 19 (FIG. 19) by the magnetic force exerted by the S pole of the rotor 410 on the tip 445 of the second magnetic plate 444 and the magnetic force exerted on the tip 441 of the first magnetic plate 440 by It is held at the position shown in b).

Referring to FIG. 19A, in a state where the rotor 410 is rotated and held in the clockwise direction, the magnetic field generated by the rotor magnet 412 is N poles of the rotor magnet 412 as indicated by a thick arrow in the figure. The direction is to exit from S and enter S pole. In this state, when a current from the back side of the drawing to the front side is passed through the first side portion 431 of the first coil 430 facing the south pole of the rotor magnet 412 (indicated by a black circle in the figure), the rotor magnet 412 Due to the influence of the S pole magnetic field, a clockwise force acts on the first side portion 431 of the first coil 430 in accordance with Fleming's left-hand rule. Accordingly, the counterclockwise rotational force acts on the south pole of the rotor magnet 412 due to the reaction of the clockwise force. In addition, a current from the front side to the back side of the paper surface flows through the second side portion 432 of the first coil 430 (shown by a cross in the drawing), similarly to the influence of the magnetic field of the south pole of the rotor magnet 412. A clockwise force acts on the second side portion 432 of the first coil 430 due to the influence of the magnetic field of the N pole of the rotor magnet 412.
Therefore, the counterclockwise rotational force acts on the north pole of the rotor magnet 412 due to the reaction of the clockwise force. Further, when a current from the front side to the back side of the drawing is applied to the first side portion 436 of the second coil 434 facing the N pole of the rotor magnet 412 (shown as a cross in the figure), the N of the rotor magnet 412 Due to the influence of the polar magnetic field, a clockwise force acts on the first side portion 436 of the second coil 434 according to Fleming's left-hand rule.
Therefore, the counterclockwise rotational force acts on the north pole of the rotor magnet 412 due to the reaction of the clockwise force. Accordingly, a counterclockwise couple acts on the rotatable rotor 410, and the rotor 410 rotates counterclockwise to the position shown in FIG. 19B and is held in that state. The

  Referring to FIG. 19B, in the state where the rotor 410 is rotated and held in the counterclockwise direction, the magnetic field generated by the rotor magnet 412 is N of the rotor magnet 412 as indicated by a thick arrow in the figure. The direction is to exit from the pole and enter the S pole. In this state, when a current from the back side of the drawing to the front side is passed through the second side portion 432 of the first coil 430 facing the north pole of the rotor magnet 412 (indicated by a black circle in the figure), the rotor magnet 412 Due to the influence of the N-pole magnetic field, a counterclockwise force acts on the second side portion 432 of the first coil 430 in accordance with Fleming's left-hand rule. Accordingly, a counterclockwise rotational force acts on the north pole of the rotor magnet 412 in the clockwise direction. In addition, a current flowing from the front side to the back side of the paper surface flows through the first side portion 431 of the first coil 430 (indicated by a cross in the drawing), similarly to the influence of the magnetic field of the N pole of the rotor magnet 412. A counterclockwise force acts on the first side portion 431 of the first coil 430 due to the influence of the magnetic field of the south pole of the rotor magnet 412. Accordingly, the counterclockwise rotational force acts on the south pole of the rotor magnet 412 due to the reaction of the counterclockwise force. Furthermore, when a current from the front side to the back side of the paper is passed through the second side portion 435 of the second coil 434 facing the S pole of the rotor magnet 412 (shown as a cross in the figure), the S of the rotor magnet 412 is increased. Due to the influence of the polar magnetic field, a counterclockwise force acts on the second side portion 435 of the second coil 434 in accordance with Fleming's left-hand rule. Accordingly, a counterclockwise rotational force acts on the south pole of the rotor magnet 412 in the clockwise direction. Accordingly, a clockwise couple acts on the rotatable rotor 410, and the rotor 410 rotates in the clockwise direction to the position shown in FIG. 19A and is held in that state. In the configuration in which the two coils 430 and 434 are provided, the couple acting on the rotor 410 acts more greatly than in the configuration in which the single coil 130 is provided, so that the rotor 410 can be reliably rotated at a high speed.

  Referring to FIG. 20, when assembling the engine portion 400 of the light shielding member operating device, for example, the lower shaft portion of the rotor 410 is disposed in the rotor bearing hole of the lower case 454. Next, the upper shaft portion of the rotor 410 is disposed in the rotor bearing hole of the upper case 450, and the upper case 450 and the lower case 454 are fixed. Thereby, the rotor 410 is supported rotatably with respect to the upper case 450 and the lower case 454. Next, the first coil 430 and the second coil 434 are arranged in the upper case 450. Next, the yoke 420 is disposed on the outer periphery of the upper case 450. Next, the first magnetic plate 440 and the second magnetic plate 444 are fixed to the yoke 420.

  Referring to FIG. 14B, in the light shielding member operating device 400 of the present invention, the shutter driving circuit 470 that drives the first engine unit 400 to operate the first shutter blade 220 and the second shutter blade 222 is a microcomputer. 472 and a shutter drive driver 474. The shutter drive driver 474 receives a drive signal output from the microcomputer 472 and causes a current to flow from the output terminals 1 and 2 to the first coil 430 provided in the shutter unit 476 and simultaneously to the second coil 434. To generate a magnetic field for rotating the rotor 410. A shutter drive circuit that drives the second engine unit (not shown) to operate the diaphragm plate 230 can be configured in the same manner as the shutter drive circuit 470.

  In the second embodiment of the present invention, the operation of the shutter device is the same as the operation of the first embodiment of the present invention shown in FIGS. That is, referring to FIG. 8 and FIG. 9, the second coil and the second magnetic plate are illustrated by imaginary lines. In the second embodiment of the present invention, the operation of the diaphragm device is the same as the operation of the first embodiment of the present invention shown in FIGS. That is, referring to FIG. 10 and FIG. 11, the second coil and the second magnetic plate are illustrated by imaginary lines.

(3) Third embodiment:
Next, a third embodiment of the present invention will be described. In the following description, the difference between the third embodiment of the present invention and the first embodiment of the present invention will be mainly described. Therefore, the description of the first embodiment of the present invention described above applies mutatis mutandis to the portions not described below.

(3.1) First type:
Referring to FIG. 21A, in the first type of the third embodiment of the present invention, the engine unit 510 of the light shielding member actuating device includes a rotor 511 and a yoke arranged with a gap around the rotor 511. 512, and a coil 513 disposed between the rotor 511 and the yoke 512. An inner wall portion 512 d located closer to the rotor 511 than the cylindrical portion 512 c of the yoke 512 is formed in the yoke 512. The inner wall portion 512d constitutes a means for positioning the rotor 511. The inner wall portion 512d can be configured by a plane parallel to the central axis of the rotor 511. The position where the inner wall portion 512d is formed on the yoke 512 is preferably arranged so as to correspond to the position between the tip portion 141 and the tip portion 142 of the magnetic plate 140 described above. This configuration facilitates part manufacture and assembly.

(3.2) Second type:
Referring to FIG. 21 (b), in the second type of the third embodiment of the present invention, the engine unit 520 of the light shielding member actuating device includes a rotor 521 and a yoke arranged with a gap around the rotor 521. 522 and a coil 523 disposed between the rotor 521 and the yoke 522. A first belt-like portion 522f and a second belt-like portion 522g projecting inward from the cylindrical portion 522c of the yoke 522 are formed on the yoke 522. The two strip portions 522f and 522g constitute a means for positioning the rotor 521. The positions where the first belt-like portion 522f and the second belt-like portion 522g are provided are preferably arranged so as to correspond to the positions of the tip portions 141 and 142 of the magnetic plate 140 described above. This configuration facilitates part manufacture and assembly.

(3.3) Third type:
Referring to FIG. 21 (c), in the third type of the third embodiment of the present invention, the engine unit 530 of the light shielding member actuating device includes a rotor 531 and a yoke arranged with a gap around the rotor 531. 532 and two coils 533 and 534 disposed between the rotor 531 and the yoke 532. On the side where the first coil 533 is present, a first inner wall portion 532 d located closer to the rotor 531 than the cylindrical portion 532 c of the yoke 532 is formed in the yoke 532. On the side where the second coil 534 is present, a second inner wall portion 532 e located closer to the rotor 531 than the cylindrical portion 532 c of the yoke 532 is formed in the yoke 532. The first inner wall portion 532 d can be configured by a plane parallel to the central axis of the rotor 531. The second inner wall portion 532e can be configured by a plane parallel to the central axis of the rotor 511. The first inner wall portion 532d is preferably formed in parallel with the second inner wall portion 532e. The first inner wall portion 532d and the second inner wall portion 532e constitute a means for positioning the rotor 531. The position where the first inner wall portion 532d is formed on the yoke 532 is preferably arranged so as to correspond to the position between the tip 441 and the tip 442 of the magnetic plate 440 described above. The position where the second inner wall portion 532e is formed in the yoke 532 is preferably arranged so as to correspond to the position between the tip 445 and the tip 445 of the magnetic plate 444 described above. This configuration facilitates part manufacture and assembly.

(3.4) Fourth type:
Referring to FIG. 21 (d), in the fourth type of the third embodiment of the present invention, the engine unit 540 of the light shielding member actuating device includes a rotor 541 and a yoke arranged with a gap around the rotor 541. 542 and two coils 543 and 544 disposed between the rotor 541 and the yoke 542. On the side where the first coil 543 is present, a first strip portion 542f and a second strip portion 542g projecting inward from the cylindrical portion 542c of the yoke 542 are formed on the yoke 542. On the side where the second coil 544 is present, a third belt-like portion 542j and a fourth belt-like portion 542k projecting inward from the cylindrical portion 542c of the yoke 542 are formed in the yoke 542. The four belt-like portions 542f, 542g, 542j, and 542k constitute a means for positioning the rotor 541. The positions where the first belt-like portion 542f and the second belt-like portion 542g are formed on the yoke 542 are preferably arranged so as to correspond to the positions of the tip portion 441 and the tip portion 442 of the magnetic plate 440 described above. The positions where the third belt-like portion 542j and the fourth belt-like portion 542k are formed on the yoke 542 are preferably arranged so as to correspond to the positions of the tip 445 and tip 446 of the magnetic plate 444 described above. This configuration facilitates part manufacture and assembly.

(3.5) Fifth type:
Referring to FIG. 22 (a), in the fifth type of the third embodiment of the present invention, the engine unit 550 of the light shielding member actuating device includes a rotor 551 and a yoke arranged with a gap around the rotor 551. 552, and a coil 553 disposed between the rotor 551 and the yoke 552. The first magnetic pin 556 and the second magnetic pin 557 are disposed inside the coil 553 inside the cylindrical portion of the yoke 552. The side surfaces of the first magnetic pin 556 and the second magnetic pin 557 are arranged so as to face the outer peripheral portion of the rotor 551 with a gap, respectively. The first magnetic pin 556 and the second magnetic pin 557 constitute a means for positioning the rotor 551. The positions at which the first magnetic pin 556 and the second magnetic pin 557 are provided are preferably arranged so as to correspond to the positions between the tip portion 141 and the tip portion 142 of the magnetic plate 140 described above.

(3.6) Sixth type:
Referring to FIG. 22 (b), in the sixth type of the third embodiment of the present invention, the engine unit 560 of the light shielding member actuating device includes a rotor 561 and a yoke arranged with a gap around the rotor 561. 562, and a first coil 563 and a second coil 564 disposed between the rotor 561 and the yoke 562, respectively. A first magnetic pin 566 and a second magnetic pin 567 are arranged inside the cylindrical portion of the yoke 562 and inside the first coil 563, respectively. A third magnetic pin 568 and a fourth magnetic pin 569 are arranged inside the cylindrical portion of the yoke 562 and inside the second coil 564, respectively. The side surfaces of the first magnetic pin 566, the second magnetic pin 567, the third magnetic pin 568, and the fourth magnetic pin 569 are arranged so as to face the outer peripheral portion of the rotor 561 with a gap, respectively. The first magnetic pin 566, the second magnetic pin 567, the third magnetic pin 568, and the fourth magnetic pin 569 constitute a means for positioning the rotor 561. The positions where the first magnetic pin 566 and the second magnetic pin 567 are provided are preferably arranged so as to correspond to the positions of the tip portion 441 and the tip portion 442 of the magnetic plate 440 described above. The positions where the third magnetic pin 568 and the fourth magnetic pin 569 are provided are preferably arranged so as to correspond to the positions of the tip portion 445 and the tip portion 446 of the magnetic plate 444 described above.

(3.7) Seventh type:
Next, another preferred configuration will be described with respect to the third embodiment of the present invention. Referring to FIG. 26 (a), in the seventh type of the third embodiment of the present invention, the engine unit 570 of the light shielding member actuating device includes a rotor 571 and a yoke arranged with a gap around the rotor 571. 572 and a coil 573 disposed between the rotor 571 and the yoke 572. A first cylindrical portion 572c having a large inner diameter and a second cylindrical portion 572d having a smaller inner diameter than the inner diameter of the first cylindrical portion 572c are formed on the yoke 572. A first boundary inner wall portion 574f and a second boundary inner wall portion 574g are formed between the first cylindrical portion 572c and the second cylindrical portion 572d. The first boundary inner wall portion 574f and the second boundary inner wall portion 574g are preferably configured by a plane parallel to the rotation center axis 570A of the rotor 571. The first boundary inner wall portion 574f and the second boundary inner wall portion 574g are preferably configured to be in the same plane. The two boundary inner wall portions, that is, the first boundary inner wall portion 574f and the second boundary inner wall portion 574g constitute a means for positioning the rotor 571. The position where the second cylindrical portion 572d is formed on the yoke 572 is preferably arranged so as to correspond to the position between the tip portion 141 and the tip portion 142 of the magnetic plate 140 described above. This configuration facilitates part manufacture and assembly.

(3.8) Eighth type:
Next, still another preferred configuration will be described with respect to the third embodiment of the present invention. Referring to FIG. 26B, in the eighth type of the third embodiment of the present invention, the engine unit 580 of the light shielding member actuating device includes a rotor 581 and a yoke arranged with a gap around the rotor 581. 582, and two coils 583 and 584 disposed between the rotor 581 and the yoke 582. On the side where the first coil 583 is present, a first cylindrical portion 582d having a small inner diameter is formed in the yoke 582. A second cylindrical portion 582e having a small inner diameter is formed in the yoke 582 on the side where the second coil 584 is present. A third cylindrical portion 582b having an inner diameter larger than the inner diameter of the first cylindrical portion 582d so as to connect one end portion of the first cylindrical portion 582d and one end portion of the second cylindrical portion 582e. Is provided on the yoke 582. The fourth cylindrical shape having an inner diameter larger than the inner diameter of the first cylindrical portion 582d so as to connect the other end portion of the first cylindrical portion 582d and the other end portion of the second cylindrical portion 582e. A portion 582 c is provided on the yoke 582. The inner diameter of the first cylindrical portion 582d is preferably formed to be equal to the inner diameter of the second cylindrical portion 582e. The inner diameter of the third cylindrical portion 582b is preferably formed to be equal to the inner diameter of the fourth cylindrical portion 582c.

  The yoke 582 is formed such that the first cylindrical portion 582d, the fourth cylindrical portion 582c, the second cylindrical portion 582e, and the third cylindrical portion 582b are continuous in the circumferential direction. The inner diameter of the first cylindrical portion 582d and the inner diameter of the second cylindrical portion 582e are preferably formed to the same dimension. Further, it is preferable that the inner diameter of the third cylindrical portion 582b and the inner diameter of the fourth cylindrical portion 582c are formed to have the same dimensions.

  A first boundary inner wall portion 584g is formed between the first cylindrical portion 582d and the fourth cylindrical portion 582c. A second boundary inner wall portion 584j is formed between the fourth cylindrical portion 582c and the second cylindrical portion 582e. A third boundary inner wall portion 584h is formed between the third cylindrical portion 582b and the second cylindrical portion 582e. A fourth boundary inner wall portion 584f is formed between the first cylindrical portion 582d and the third cylindrical portion 582b. The first boundary inner wall portion 584g, the second boundary inner wall portion 584j, the third boundary inner wall portion 584h, and the fourth boundary inner wall portion 584f are configured by planes parallel to the rotation center axis 580A of the rotor 581. Is preferred. The first boundary inner wall portion 584f and the second boundary inner wall portion 584g are preferably configured to be in the same plane. The second boundary inner wall portion 584j and the third boundary inner wall portion 584h are preferably configured to be in the same plane.

  The four boundary inner wall portions, namely, the first boundary inner wall portion 584g, the second boundary inner wall portion 584j, the third boundary inner wall portion 584h, and the fourth boundary inner wall portion 584f are means for positioning the rotor 581. Constitute. The positions where the fourth boundary inner wall portion 584f and the first boundary inner wall portion 584g are formed on the yoke 582 correspond to the positions of the tip portion 441 and the tip portion 442 of the magnetic plate 440 (see FIG. 19) described above. It is good to arrange. The positions where the second boundary inner wall portion 584j and the third boundary inner wall portion 584h are formed in the yoke 582 correspond to the positions of the tip portion 445 and the tip portion 446 of the magnetic plate 444 (see FIG. 19), respectively. It is good to arrange. This configuration facilitates part manufacture and assembly.

(4) Fourth embodiment:
Next, a fourth embodiment of the present invention will be described. In the following description, the difference between the fourth embodiment of the present invention and the first embodiment of the present invention will be mainly described. Therefore, the description of the first embodiment of the present invention described above applies mutatis mutandis to the portions not described below.

  Referring to FIG. 23, in the fourth embodiment of the present invention, the imaging lens 600 equipped with the shutter operating device of the present invention is held by the engine unit 602, the lens barrel unit 640, and the lens frame unit 641. A lens system 642. The engine unit 602 includes a rotor 610, a yoke 620, and a coil 630 disposed between the rotor 610 and the yoke 620. The rotor 610 has a rotation center axis 610A. The rotor 610 includes a rotor magnet 612 and a rotor shaft 614. A shutter operating member 660 is provided on the lower shaft portion of the rotor shaft 614. The shutter operation member 660 includes an operation shaft 662, an operation lever 664, and an operation pin 666. The actuation shaft 662 can be disposed around the lens system 642. The operation shaft 662 can be formed integrally with the rotor shaft 614, or can be formed separately from the rotor shaft 614 and fixed so as to be coaxial with the rotor shaft 614. In this configuration, the rotor shaft can be extended downward, the engine unit and the shutter blade chamber unit can be arranged apart from each other, and the space in the lens unit can be effectively utilized.

  One or two shutter blades 670 are supported by the lens frame portion 641 so as to be rotated by the rotation of the operation pin 666. When the engine unit 602 is operated, the rotor 610 rotates and the shutter blade 670 rotates. The shutter blade 670 completely blocks the optical path of the lens system 642 at one position rotated by the rotation of the rotor 610, and the optical path of the lens system 642 at the other position rotated by the rotation of the rotor 610. Configured not to block. This configuration can also be applied to a diaphragm device.

  According to the present invention, it is possible to manufacture a light shielding member actuating device configured to be able to reduce the height of the engine unit. Further, according to the present invention, it is possible to manufacture a light shielding member actuating device configured so that the initial rotation speed of the rotor can be increased and the initial rotation torque of the rotor can be increased. According to the present invention, it is possible to manufacture a light shielding member actuating device configured so that the rotor can be reliably held at the stop position when no current is supplied to the coil. The light shielding member operating device of the present invention is easy to manufacture and assemble parts.

In the 1st Embodiment of this invention, it is a horizontal cross-sectional view which shows the engine part fractured | ruptured in the intermediate part of the axial direction of the rotor. In the 1st Embodiment of this invention, it is a longitudinal cross-sectional view which shows an engine part. In the 1st Embodiment of this invention, it is a bottom view which shows an engine part. FIG. 4 (a), which is a partial plan view showing a part of the engine portion with the upper case removed in the first embodiment of the present invention, is a plane showing a state when the rotor is rotated in the clockwise direction. FIG. FIG. 4B is a plan view showing a state when the rotor rotates counterclockwise. In the 1st Embodiment of this invention, it is a perspective view which shows schematic shape of a coil. In the 1st Embodiment of this invention, it is a disassembled perspective view which shows an engine part. In the 1st Embodiment of this invention, it is a longitudinal cross-sectional view which shows a shutter apparatus. In the 1st Embodiment of this invention, it is a top view which shows the shutter apparatus of the state which removed the upper case in the closed state (the components of the 2nd Embodiment of this invention are illustrated with the imaginary line) . FIG. 3 is a plan view showing the shutter device in a state where the upper case is removed in the opened state in the first embodiment of the present invention (parts of the second embodiment of the present invention are illustrated by imaginary lines). . In the first embodiment of the present invention, it is a plan view showing a diaphragm device with the upper case removed in a non-operating state (parts of the second embodiment of the present invention are illustrated by imaginary lines) ) In the 1st Embodiment of this invention, it is a top view which shows the aperture_diaphragm | restriction apparatus of the state which removed the upper case in the state which act | operated (The components of the 2nd Embodiment of this invention are illustrated with the imaginary line) . In the 1st Embodiment of this invention, it is a perspective view which shows a shutter unit. FIG. 2 is an exploded perspective view showing an imaging lens and a shutter unit in the first embodiment of the present invention. 1 is a block diagram showing a schematic configuration of a circuit in an embodiment of the present invention. FIG. 14A is a block diagram in the first embodiment of the present invention. FIG. 14B is a block diagram in the second embodiment of the present invention. In the 1st Embodiment of this invention, it is a longitudinal cross-sectional view which shows schematic structure of an imaging device. In the 2nd Embodiment of this invention, it is a horizontal cross-sectional view which shows the engine part fractured | ruptured in the intermediate part of the axial direction of the rotor. In the 2nd Embodiment of this invention, it is a longitudinal cross-sectional view which shows an engine part. In the 2nd Embodiment of this invention, it is a bottom view which shows an engine part. In the 2nd Embodiment of this invention, it is a fragmentary top view which shows a part of engine part in the state which removed the upper case. FIG. 19A is a plan view showing a state when the rotor rotates in the clockwise direction. FIG. 19B is a plan view showing a state when the rotor rotates counterclockwise. In the 2nd Embodiment of this invention, it is a disassembled perspective view which shows an engine part. In the 3rd Embodiment of this invention, it is a fragmentary top view which shows a part of engine part in the state which removed the upper case. FIG. 21A is a partial plan view of the first type. FIG. 21B is a partial plan view of the second type. FIG. 21C is a partial plan view of the third type. FIG. 21D is a partial plan view of the fourth type. In the 3rd Embodiment of this invention, it is a fragmentary top view which shows a part of engine part in the state which removed the upper case. FIG. 22A is a partial plan view of the fifth type. FIG. 22B is a partial plan view of the sixth type. In the 4th Embodiment of this invention, it is a longitudinal cross-sectional view which shows an engine part. It is a horizontal cross section which shows the conventional electromagnetic actuator fractured | ruptured in the intermediate part of the axial direction of the rotor. It is a longitudinal cross-sectional view which shows the conventional electromagnetic actuator. In the further structure of the 3rd Embodiment of this invention, it is a fragmentary top view which shows a part of engine part in the state which removed the upper case. FIG. 26A is a partial plan view of the seventh type. FIG. 26B is a partial plan view of the eighth type.

Explanation of symbols

100 Engine part 110 Rotor 120 Yoke 130 Coil 140 Magnetic plate 150 Upper case 154 Lower case 160 Actuating member 162 Actuating lever 164 Actuating pin 180 First engine part 182 Second engine part 200 Light shielding member actuating device 210 Shutter base plate 220 First Shutter blade 222 Second shutter blade 230 Aperture plate 240 Separator plate 250 Blade chamber cover

Claims (26)

In the light shielding member operating device for a camera,
A rotor having a rotation center axis, the rotor including a rotor magnet magnetized in two poles, N pole and S pole, with reference to a magnetic pole boundary surface including the rotation center axis; Is rotatably supported against
Furthermore, a cylindrical yoke formed of a magnetic material is provided, and the yoke is disposed with a gap around the rotor,
And a coil disposed between the rotor and the yoke;
Rotor positioning means formed of a magnetic material, and the rotor positioning means is provided for the yoke,
A light shielding member provided to rotate based on the rotation of the rotor;
A light shielding member actuating device comprising:   The light shielding member actuating device according to claim 1, wherein the coil is formed to be curved along the inner peripheral portion of the yoke.   The light shielding member actuating device according to claim 1, wherein the coil includes two linear portions arranged in parallel to a rotation center axis of the rotor.   The light shielding member actuating device according to claim 3, wherein the rotor positioning means is disposed at a position inside the two linear portions of the coil and inside the yoke.   Furthermore, an operation member for rotating the light shielding member based on the rotation of the rotor is provided, and the center of the coil is a plane including the magnetic pole boundary plane of the rotor at a middle position in a range where the operation member rotates. The light-shielding member actuating device according to claim 3, wherein the light-shielding member actuating device is disposed on the surface.   Furthermore, an operating member for rotating the light shielding member based on the rotation of the rotor is provided, and the outer peripheral portion of the rotor where the magnetic flux density of the magnetic pole of the rotor in the state where the operating member is rotated is the The light-shielding member actuating device according to claim 3, wherein the light-shielding member actuating device is disposed so as to face one of the linear portions of the coil with a gap.   The rotor positioning means is composed of a magnetic plate formed in a U-shape, and the two tip portions of the magnetic plate are arranged so as to face the outer peripheral portion of the rotor with a gap, respectively. The light-shielding member actuating device according to claim 1, characterized in that it is characterized in that:   The light shielding member actuating device according to claim 1, wherein the rotor positioning means is constituted by an inner wall portion of the yoke formed so as to be closer to the rotor than a cylindrical portion of the yoke.   The rotor positioning means is composed of one or a plurality of magnetic pins disposed inside the coil inside the cylindrical portion of the yoke, and a side surface of the magnetic pin is a gap with respect to an outer peripheral portion of the rotor The light-shielding member actuating device according to claim 1, wherein the light-shielding member actuating device is disposed so as to face each other.   Furthermore, an operating member for rotating the light shielding member based on the rotation of the rotor is provided, and the action portion where the operating member applies a force to the light shielding member is on a plane including the magnetic pole boundary plane of the rotor. The light shielding member actuating device according to claim 1, wherein the light shielding member actuating device is arranged.   The operation member for rotating the light shielding member based on the rotation of the rotor is provided, and the operation member is fixed to an end portion of a central axis of the rotor. Shading member actuating device.   The light-shielding member operating device according to claim 1, further comprising a drive circuit for generating a magnetic field for causing the current to flow through the coil to rotate the rotor. In the light shielding member operating device for a camera,
A rotor having a rotation center axis, the rotor including a rotor magnet magnetized in two poles, N pole and S pole, with reference to a magnetic pole boundary surface including the rotation center axis; Is rotatably supported against
Furthermore, a cylindrical yoke formed of a magnetic material is provided, and the yoke is disposed with a gap around the rotor,
Two coils disposed between the rotor and the yoke;
Rotor positioning means formed of a magnetic material, and the rotor positioning means is disposed inside each hole of the coil and at a position inside the yoke, respectively.
Furthermore, a light shielding member provided to rotate based on the rotation of the rotor is provided.
A light-shielding member actuating device comprising:   14. The light-shielding member operating device according to claim 13, wherein each of the coils is formed to be curved along an inner peripheral portion of the yoke.   14. The light-shielding member operating device according to claim 13, wherein each of the coils includes two linear portions arranged in parallel to a rotation center axis of the rotor.   Furthermore, an operation member for rotating the light shielding member based on the rotation of the rotor is provided, and the center of each of the coils is the magnetic pole boundary plane of the rotor at an intermediate position in the range in which the operation member rotates. The light-shielding member actuating device according to claim 16, wherein the light-shielding member actuating device is disposed on a plane including the light shielding member.   Furthermore, an operating member for rotating the light shielding member based on the rotation of the rotor is provided, and the outer peripheral portion of the rotor where the magnetic flux density of the magnetic pole of the rotor in the state where the operating member is rotated is the The light-shielding member actuating device according to claim 13, wherein the light-shielding member actuating device is disposed so as to face one of the linear portions of each coil with a gap.   Each of the rotor positioning means is composed of a magnetic plate formed in a U-shape, and the two tip portions of each of the rotor positioning members are respectively opposed to the outer peripheral portion of the rotor with a gap. The light shielding member actuating device according to claim 13, wherein the light shielding member actuating device is arranged.   Furthermore, an operation member is provided that is fixed to the rotor and that rotates the light shielding member based on the rotation of the rotor, and an interlocking portion between the light shielding member and the operation member is located on the magnetic pole boundary surface. The light-shielding member actuating device according to claim 1 or 13, characterized in that   The light-shielding member operating device according to claim 1, further comprising a drive circuit that generates a magnetic field for rotating the rotor by causing a current to flow through the coil.   An imaging lens including an optical system includes the light shielding member actuating device according to any one of claims 1 to 11 and 13 to 19, wherein the light shielding member is a diaphragm blade or a shutter blade. An imaging lens characterized by being.   An imaging lens including an optical system includes two light shielding member actuating devices according to any one of claims 1 to 11 and 13 to 19, and one of the light shielding member actuating devices is a diaphragm blade. And the other light shielding member of the light shielding member actuating device is a shutter blade.   An imaging apparatus having an imaging lens including an optical system, comprising the light shielding member actuating device according to any one of claims 1 to 11 and 13 to 19, wherein the light shielding member is a diaphragm blade, or An imaging device, comprising: a shutter circuit that is a blade of a shutter and generates a magnetic field for causing a current to flow through a coil of the light shielding member actuating device to rotate a rotor of the light shielding member actuating device.   An imaging apparatus having an imaging lens including an optical system, comprising two light shielding member actuating devices according to any one of claims 1 to 11 and 13 to 19, wherein one of the light shielding member actuating devices is a light shielding member. Is a diaphragm blade, and the other light shielding member of the light shielding member actuating device is a shutter blade, and a current is passed through the respective coils of the two light shielding member actuating devices, thereby the two light shielding member actuating devices. An imaging apparatus comprising: a drive circuit that generates a magnetic field for rotating each of the rotors.   The yoke is formed with a first cylindrical portion having a large inner diameter and a second cylindrical portion having an inner diameter smaller than the inner diameter of the first cylindrical portion, and the rotor positioning means is a first cylindrical portion of the yoke. The light-shielding member actuating device according to claim 1, wherein the light-shielding member actuating device is constituted by a second cylindrical portion of the yoke formed so as to be closer to the rotor than the portion.   On the side where the first coil is present, a first cylindrical portion having a small inner diameter is formed on the yoke, and on the side where the second coil is present, a second cylindrical portion having a small inner diameter is formed on the yoke, A third cylindrical portion having an inner diameter larger than the inner diameter of the first cylindrical portion is connected to connect one end portion of the first cylindrical portion and one end portion of the second cylindrical portion. The inner diameter of the first cylindrical portion is larger than the inner diameter of the first cylindrical portion so as to connect the other end of the first cylindrical portion and the other end of the second cylindrical portion. A fourth cylindrical portion is provided on the yoke, a first boundary inner wall portion is formed between the first cylindrical portion and the fourth cylindrical portion, and the fourth cylindrical portion and the first cylindrical portion are formed. A second boundary inner wall portion is formed between the second cylindrical portion and the third cylindrical portion; A third boundary inner wall portion is formed between the first cylindrical portion and the third cylindrical portion, and a fourth boundary inner wall portion is formed between the first cylindrical portion and the third cylindrical portion. 14. The light shielding member actuating device according to claim 13, wherein one boundary inner wall portion constitutes a means for positioning the rotor.

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