JP2019095496A - Imaging device - Google Patents

Abstract

To provide an imaging device with which it is possible to execute the function needed for imaging and reduce power consumption in a state in which a shutter blade does not open/close an aperture.SOLUTION: The imaging device comprises: light-shielding means equipped with a light-shielding member capable of moving between a close position where the aperture is closed and an open position where the aperture is leased open; a cam member including a first and a second cam region engaging with the light-shielding means; a mirror unit capable of moving between a mirror-up state of being retreaded to outside of an imaging optical path and a mirror-down state of being positioned within the imaging optical path; and a lock member capable of moving between a lock position where the movement of the mirror unit is limited and an unlock position where the movement of the mirror unit is enabled. The light-shielding member is positioned at the closed position or open position while the light-shielding means is engaged with the first cam region, and the light-shielding member moves between the closed position and the open position while the light-shielding means is engaged with the second cam region. The lock member moves between the lock position and the unlock position while the light-shielding means is engaged with the first cam region.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an imaging device having a shutter device.

  Patent Document 1 discloses a shutter device having a state in which the shutter blade does not open and close the opening even if the stepping motor is driven, and a state in which the shutter blade opens and closes the opening by driving the stepping motor.

Japanese Patent Application Laid-Open No. 7-56211

  In the shutter device of Patent Document 1, acceleration of the stepping motor is performed in order to drive the shutter blades with high accuracy in a state where the shutter blades do not open and close the opening. However, when the shutter device of Patent Document 1 is mounted on a camera, the above state has no influence on photographing.

  An object of the present invention is to provide an imaging device capable of executing a function necessary for imaging and reducing power consumption in a state where the shutter blade does not open and close the opening.

  A shutter device according to one aspect of the present invention includes a light shielding unit including a light shielding member movable between a closed position for closing the opening and an open position for opening the opening; A cam member having a second cam region and a second cam region, a mirror unit movable between a mirror-up state retracted to the outside of the imaging optical path and a mirror-down state located in the imaging optical path, and movement of the mirror unit And a lock member movable between the lock position for restricting the movement and the lock release position for permitting movement of the mirror unit, while the light shielding means is engaged with the first cam area The light blocking member is located at the closed position or the open position, and the light blocking member is moved between the closed position and the open position while the light blocking means is engaged with the second cam area. And Serial locking member, while the light blocking means is engaged with said first cam region, thus being moved between the unlocked position and the locked position.

  According to the present invention, it is possible to provide an imaging device capable of executing the functions necessary for photographing and reducing power consumption in a state where the shutter blade does not open and close the opening.

It is a center sectional view of an imaging device concerning an embodiment of the present invention. It is a disassembled perspective view of the member in an imaging device. It is the figure which looked at the cam board from the imaging surface side. FIG. 6 is a view of members in the imaging device as viewed from the subject side. It is an operation timing chart of the main member at the time of photography. It is a figure which shows the state of the main member of each timing of FIG. It is structure explanatory drawing of a motor. It is operation | movement explanatory drawing of a motor. It is arrangement | positioning explanatory drawing of the 1st-4th magnetic sensor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each of the drawings, the same members are denoted by the same reference numerals, and duplicate explanations are omitted.
[Overall Configuration of Imaging Device]
First, with reference to FIG. 1, an entire configuration of an imaging apparatus according to an embodiment of the present invention will be described. FIG. 1 is a central cross-sectional view of a digital single-lens reflex camera main body (hereinafter referred to as a camera) 100 which is an example of an imaging device, and an interchangeable lens 50.

  The interchangeable lens 50 is detachably fixed to the camera 100 by the mount unit 210 on the camera 100 side and the mount unit 51 on the interchangeable lens 50 side. When the interchangeable lens 50 is attached to the camera 100, the contact portion 220 of the camera 100 and the contact portion 52 of the interchangeable lens 50 are electrically connected.

  The light beam transmitted through the focusing lens 53 of the interchangeable lens 50 is incident on the main mirror 130. The main mirror 130 is held by the main mirror holding frame 131, and is movably supported between a mirror-up position retracted to the outside of the photographing optical path and a mirror-down position positioned in the photographing optical path by the shaft portion 131a. The main mirror 130 is a half mirror, and the light beam transmitted through the main mirror 130 is reflected downward by the sub mirror 140 and guided to the focus detection unit 150. The sub mirror 140 is held by a sub mirror holding frame 141. The sub mirror holding frame 141 is pivotally supported relative to the main mirror holding frame 131 by a hinge shaft (not shown). The mirror unit 300 includes a main mirror 130, a main mirror holding frame 131, a sub mirror 140, and a sub mirror holding frame 141.

  The focus detection unit 150 detects the defocus amount of the focus lens 53, and calculates the drive amount of the focus lens 53 with which the focus lens 53 is in focus. The interchangeable lens 50 receives the calculated drive amount through the contact portion 220 and the contact portion 52. The interchangeable lens 50 controls a motor (not shown) based on the received drive amount, and performs focus adjustment by driving the focus lens 53.

  The luminous flux reflected by the main mirror 130 is guided to the optical finder 160. The optical finder 160 has a focusing screen 170, a pentaprism 180, and an eyepiece lens 190. The luminous flux guided to the optical finder 160 by the main mirror 130 forms an object image on the focusing plate 170. The user can observe the subject image on the focusing screen 170 through the pentaprism 180 and the eyepiece lens 190.

  A shutter device 20 is disposed behind the mirror unit 300. An optical low pass filter 21, an imaging element holder 22, an imaging element 23, a cover member 24 and a rubber member 25 are disposed behind the shutter device 20. At the time of photographing, the light flux transmitted through the optical low pass filter 21 is incident on the imaging device 23. The image sensor holder 22 holds the image sensor 23 and is fixed to the housing of the camera 100 by screws (not shown). The cover member 24 protects the imaging device 23. The rubber member 25 holds the optical low pass filter 21 and seals the space between the optical low pass filter 21 and the imaging device 23.

The display monitor 26 is a monitor configured of an LCD or the like, and displays a captured image and displays various setting states of the camera 100.
[Configuration of shutter drive mechanism]
FIG. 2 is an exploded perspective view of members in the camera 100. FIG. FIG. 2A is a view seen from the subject side, and FIG. 2B is a view seen from the imaging surface side. In the present embodiment, the motor 1, the cam plate 107, the spring member 108, the drive lever 109, and the shutter blade (light shielding member) 110 are referred to as a shutter driving mechanism (light shielding unit).

  The motor 1 is connected to a drive circuit 14. The drive circuit 14 is connected to the control circuit (control unit) 13. A pinion gear 101 is press-fitted to the output shaft of the motor 1. The motor 1 is driven by a step drive mode (open loop drive mode) that switches the energization state of the coil according to a predetermined time interval, or a stepping motor driven by a feedback drive mode that switches the energization state of the coil according to the output of the position sensor. It is. In the present embodiment, two types of feedback drive modes with different advance amounts are used.

  The motor 1 is attached to a motor attachment plate 102. The motor mounting plate 102 is fixed to the shutter base plate 103. A rotary plate (moving member) 106, a cam plate (cam member) 107, and a spring member 108 are attached to the shutter base plate 103, and the case member 113 is attached to the shutter base plate 103. The members are stored. The rotary plate 106 and the cam plate 107 are pivotally supported by a shaft portion 103 a provided on the shutter base plate 103. The cam plate 107 is rotated by the drive of the motor 1, and the rotary plate 106 is rotated with the rotation of the cam plate 107. A cam groove 107a for driving the shutter blade 110 is formed on the surface on the imaging surface side of the cam plate 107, and a gear portion 107b is provided on the surface on the subject side. The spring member 108 is disposed such that its cylindrical central axis is coaxial with the pivot axis of the cam plate 107. The first end of the spring member 108 is engaged with the projection 103 c provided on the shutter base plate 103, and the second end engages with the projection 106 c provided on the rotary plate 106.

  The shutter blade 110 is disposed between the shutter base plate 103 and the cover member 114. A drive arm 110 a is attached to the shutter blade 110. The drive lever 109 is pivotally supported by the shutter base plate 103, and has a cam pin 109a and an engagement pin 109b. The cam pin 109a is engaged with the cam groove 107a. The engagement pin 109b is engaged with the drive arm 110a. The rotation of the drive lever 109 moves the shutter blade 110 between an open position for opening the aperture 103 d formed in the shutter base plate 103 and a closed position for closing the aperture 103 d.

  FIG. 3 is a view of the cam plate 107 as viewed from the imaging surface side. As described above, the cam groove 107a with which the cam pin 109a is engaged is formed on the surface of the cam plate 107 on the imaging surface side. In the cam groove 107a, a first idle driving area α, an exposure driving area β, and a second idle driving area γ are set. The cam lift is almost zero in the first free running area α and the second free running area γ. In the present embodiment, the first idle driving area α and the second idle driving area γ correspond to a first cam area, and the exposure driving area β corresponds to a second cam area.

  When the cam pin 109a traces the first idle drive area α or the second idle drive area γ, the drive lever 109 does not rotate, and the shutter blade 110 maintains the closed state or the open state. When the cam pin 109a traces the exposure drive area β, the drive lever 109 pivots, and the shutter blade 110 moves from the closed state to the open state or from the open state to the closed state.

When the cam plate 107 rotates in the CCW direction as viewed from the imaging surface side, the cam pin 109a traces the first free drive area α, the exposure drive area β, and the second free drive area γ in this order. When the cam plate 107 rotates in the CW direction as viewed from the imaging surface side, the cam pins 109a trace the second free drive area γ, the exposure drive area β, and the first free drive area α in this order.
[Configuration of mirror lock mechanism]
FIG. 4 is a view of members in the camera 100 as viewed from the subject side. In FIG. 4A, the mirror unit 300 is in the mirror down state in which the main mirror 130 is located at the mirror down position. In FIG. 4B, the mirror unit 300 is in the mirror-up state in which the main mirror 130 is located at the mirror-up position.

  The configuration of the mirror lock mechanism for bringing the mirror unit 300 into the locked state or the unlocked state (unlocked state) will be described below. In this embodiment, the rotary plate 106, the mirror unit 300, the mirror charge gear 301, the lock lever 302, the spring member 303, the regulation lever 304, the spring member 305, the mirror lever 306, the spring member 307 and the spring member 308 are referred to as a mirror lock mechanism. .

The mirror charge gear 301 is rotatably supported by a shaft portion 103 b provided on the shutter base plate 103, and meshes with the gear portion 107 b. Therefore, the mirror charge gear 301 is rotated as the cam plate 107 is rotated. The lock lever (lock member) 302 is pivotally supported by a shaft portion 113b provided on the case member 113, and is capable of moving the mirror unit 300 and the lock position that restricts the movement of the mirror unit 300. Move between the position (lock release position). The first end of the spring member 303 is fixed to a fixing portion provided on the case member 113, and the second end is locked to the lock lever 302. Thereby, the spring member 303 biases the lock lever 302. The regulating lever (regulating member) 304 is pivotally supported by a shaft portion 113 c provided in the case member 113, and regulates rotation of the lock lever 302. The first end of the spring member 305 is fixed to a fixing portion provided on the case member 113, and the second end is locked to the regulating lever 304. Thus, the spring member 305 biases the regulating lever 304. The rotary plate 106 has a projection (first projection) 106 a that engages with the lock lever 302 and a projection (second projection) 106 b that engages with the regulating lever 304. The mirror lever (mirror moving member) 306 is pivotally supported by a shaft portion 113 a provided on the case member 113. Further, the mirror lever 306 engages with the protrusion 131 b provided on the main mirror holding frame 131 to move the mirror unit 300. In addition, the mirror lever 306 is provided with a protrusion 306 a. The protrusion 306 a is engaged with a protrusion 301 a provided on the mirror charge gear 301. The first end of the spring member 307 is locked to a fixing portion provided on the case member 113, and the second end is locked to the mirror lever 306. Thereby, the spring member 307 biases the mirror lever 306 in the mirror-up direction. The first end of the spring member 308 is locked to the mirror lever 306, and the second end is engaged with the protrusion 131b. Thereby, the spring member 308 biases the mirror lever 306 in the mirror down direction.
[Driving order of shutter drive mechanism and mirror lock mechanism]
The driving order of the shutter drive mechanism and the mirror lock mechanism at the time of shooting will be described with reference to FIGS. 5 and 6. FIG. 5 is an operation timing chart of main members at the time of photographing. FIGS. 6A to 6I show the states of the respective members at the timing A-I in FIG. 5, respectively. In FIG. 6, the spring members 108, 303, and 305 are omitted. In the present embodiment, the camera 100 performs the photographing operation of the first frame up to the timing A-I of FIG. 5. In this photographing operation, the front curtain operation is performed electronically, and the rear curtain operation is performed by the shutter drive mechanism.
(Description of state A)
When the camera 100 starts the photographing operation at timing A, the main members are in the state A shown in FIG. In state A, the shutter blade 110 opens the aperture 103d. The spring member 108 is not charged and is in a natural state. The protrusion 106 a of the rotary plate 106 is not in contact with the protrusion 302 a of the lock lever 302 in the figure, but may be in contact. The mirror lever 306 engages with the protruding lock piece 302b of the lock lever 302, and the main mirror 130 is held in the mirror down position.
(Description of state B)
After timing A, the control circuit 13 controls the drive circuit 14 such that the motor 1 is driven in the CW direction as viewed from the output shaft in the low advance feedback drive mode. When driving of the motor 1 starts, the projection 106c of the rotary plate 106 abuts on the second end of the spring member 108, and the rotary plate 106 rotates in the CCW direction of FIG. 6A while charging the spring member 108. Since the rotating plate 106 rotates while charging the spring member 108, the load fluctuation during driving of the motor 1 becomes large. However, the motor 1 is driven in the low advance feedback drive mode and does not get out of step.

  By the rotation of the rotary plate 106, the projection 106a pushes the projection 302a, and the lock lever 302 rotates in the CW direction of FIG. 6A. As a result, the projecting lock piece 302 b retracts from the mirror lever 306 against the spring force of the spring member 303. At this time, the recess formed by the projection 304 a of the control lever 304 engages with the projection 302 c of the lock lever 302, and the lock lever 302 enters the recess of the control lever 304 by the spring force of the spring member 305. It is kept as it is. The state of the main members at this time (timing B) is the state B shown in FIG. 6 (B).

  In state B, the shutter blade 110 opens the aperture 103d. After timing B, the mirror lever 306 starts rotating in the CW direction in FIG. 6B, whereby the main mirror 130 held at the mirror down position starts to move to the mirror up position.

During the transition from the state A to the state B, the cam plate 107 rotates in the CCW direction of FIG. 6A, and the cam pin 109a traces the first free running area α of the cam groove 107a. Therefore, the position of the drive lever 109 in the state B is substantially the same as the position of the drive lever 109 in the state A.
(Description of state C)
After timing B, the control circuit 13 continues to control the drive circuit 14 such that the motor 1 is driven in the CW direction as viewed from the output shaft in the low advance feedback drive mode. The main member enters the state C shown in FIG. 6C at timing C. In state C, the shutter blade 110 opens the aperture 103d. Further, the charging of the spring member 108 by the rotation of the rotary plate 106 is completed. Also, the main mirror 130 has reached the mirror-up position.

  During the transition from the state B to the state C, the cam plate 107 rotates in the CCW direction of FIG. 6B, and the cam pin 109a traces the first free running area α of the cam groove 107a. Therefore, the position of the drive lever 109 in the state C is substantially the same as the position of the drive lever 109 in the state B.

Further, while the main members shift from the state B to the state C, the protrusions 106a and 106b do not engage with the lock lever 302 and the control lever 304, respectively, so the lock lever 302 is in the same state as the state B.
(Description of state D)
After timing C, the control circuit 13 controls the drive circuit 14 such that the motor 1 is driven in the CCW direction as viewed from the output shaft in the step drive mode. The rotary plate 106 starts rotation in the CW direction of FIG. 6C so that the spring member 108 is in the open state. The main member is in the state D shown in FIG. In state D, the shutter blade 110 is in a state just before starting to close the aperture 103d. Also, the spring member 108 is in a completely opened state. Also, the main mirror 130 is held at the mirror-up position.

  While the main member shifts from the state C to the state D, the cam plate 107 rotates in the CW direction of FIG. 6C, and the cam pin 109a traces the first free drive area α of the cam groove 107a. Therefore, the position of the drive lever 109 in the state D is substantially the same as the position of the drive lever 109 in the state C.

Further, while the main members shift from the state C to the state D, the lock lever 302 is in the same state as the state C because the protrusions 106a and 106b do not engage with the lock lever 302 and the control lever 304, respectively.
(Description of state E)
After timing D, the control circuit 13 controls the drive circuit 14 such that the motor 1 is driven in the CCW direction as viewed from the output shaft in the high advance feedback drive mode. The rotating plate 106 continues to rotate in the CW direction of FIG. 6 (D). The main member is in the state E shown in FIG. 6 (E) at timing E. In state E, the shutter blade 110 closes the aperture 103d. Also, the main mirror 130 is held at the mirror-up position.

  While the main member shifts from state D to state E, the cam plate 107 rotates in the CW direction of FIG. 6C, and the cam pin 109a traces the exposure drive area β of the cam groove 107a. Therefore, the drive lever 109 rotates, and the shutter drive mechanism starts the exposure drive. Thereby, the shutter blade 110 starts closing the aperture 103 d and closes the aperture 103 d at timing E. Therefore, since it is necessary to drive the motor 1 at a high speed at the time of exposure drive, load fluctuation during driving of the motor 1 becomes large. However, since the motor 1 is driven in the high advance feedback drive mode, it is not out of step due to high speed drive or load fluctuation. Further, since the rotational speed of the motor 1 is sufficiently high by the run-up drive from the timing C, the motor 1 can be driven at high speed in the high advance angle feedback drive mode.

Further, while the main members shift from the state D to the state E, the protrusions 106a and 106b do not engage with the lock lever 302 and the restricting lever 304, respectively, so the lock lever 302 is in the same state as the state D.
(Description of state F)
After timing E, the control circuit 13 continues to control the drive circuit 14 such that the motor 1 is driven in the CCW direction as viewed from the output shaft in the high advance feedback drive mode. The protrusion 106 c of the rotating plate 106 abuts on the second end of the spring member 108, and the rotating plate 106 rotates in the CW direction of FIG. 6E while charging the spring member 108. Thereby, the high speed rotation of the rotary plate 106 after the aperture 103 d is closed can be decelerated. Since the rotating plate 106 rotates while charging the spring member 108, the load fluctuation during driving of the motor 1 becomes large. However, the motor 1 is driven in the high advance feedback drive mode and does not get out of step. The main member is in the state F shown in FIG. In state F, the shutter blade 110 closes the aperture 103d. Also, the main mirror 130 has reached the mirror down position.

  While the main member shifts from state E to state F, the cam plate 107 rotates in the CW direction of FIG. 6E, and the cam pin 109a traces the second free running area γ of the cam groove 107a. Therefore, the position of the drive lever 109 in the state F is substantially the same as the position of the drive lever 109 in the state E.

In addition, while the main members shift from the state E to the state F, the protrusions 106a and 106b do not engage with the lock lever 302 and the control lever 304, respectively, so the lock lever 302 is in the same state as the state E. However, the protrusion 106 b approaches to the front of the protrusion 304 a.
(Description of state G)
After timing F, the control circuit 13 continues to control the drive circuit 14 such that the motor 1 is driven in the CCW direction as viewed from the output shaft in the high advance feedback drive mode. The rotary plate 106 rotates in the CW direction of FIG. 6 (F) while charging the spring member 108. Thereby, the high speed rotation of the rotary plate 106 after the aperture 103 d is closed can be decelerated. Since the rotating plate 106 rotates while charging the spring member 108, the load fluctuation during driving of the motor 1 becomes large. However, the motor 1 is driven in the high advance feedback drive mode and does not get out of step. The main member is in the state G shown in FIG. 6 (G) at the timing G. In state G, the shutter blade 110 closes the aperture 103d.

  While the main member shifts from the state F to the state G, the cam plate 107 rotates in the CW direction of FIG. 6F, and the cam pin 109a traces the second free running area γ of the cam groove 107a. Therefore, the position of the drive lever 109 in the state G is substantially the same as the position of the drive lever 109 in the state F.

Also, while the main member transitions from the state F to the state G, the projection 106b engages with the projection 304a, and the regulating lever 304 rotates in the CW direction of FIG. 6 (F). As a result, the protrusion 302 c is disengaged from the recess of the regulating lever 304. Then, the lock lever 302 is rotated in the CCW direction of FIG. 6F by the biasing force of the spring member 303, and the projection lock piece 302 b engages with the mirror lever 306. Thereby, the rotation of the mirror lever 306 is restricted, and the main mirror 130 is locked. On the other hand, the regulating lever 304 is rotated in the CCW direction of FIG. 6F by the biasing force of the spring member 305, and the tip end of the projection 304a abuts on the surface of the projection 302c. Thus, the regulation lever 304 is in a state in which the rotation is regulated.
(Description of state H)
After timing G, when a predetermined time has elapsed, the control circuit 13 controls the drive circuit 14 such that the motor 1 is driven in the CW direction as viewed from the output shaft in the high advance feedback drive mode. At this time, the rotating plate 106 starts to rotate in the CCW direction of FIG. 6 (G), and the charged spring member 108 is released. The main applying member is in the state H shown in FIG. 6H at timing H. In state H, the shutter blade 110 closes the aperture 103d.

  While the main member transitions from state G to state H, the cam plate 107 rotates in the CCW direction of FIG. 6G, and the cam pin 109a traces the second free running area γ of the cam groove 107a. Therefore, the position of the drive lever 109 in the state H is substantially the same as the position of the drive lever 109 in the state G.

Further, while the main members shift from the state G to the state H, the protrusions 106a and 106b are not engaged with the lock lever 302 and the restricting lever 304, respectively, so the lock lever 302 is in the same state as the state G.
(Description of state I)
After timing H, the control circuit 13 continues to control the drive circuit 14 such that the motor 1 is driven in the CW direction as viewed from the output shaft in the high advance feedback drive mode. The main member is in the state I shown in FIG. In state I, the shutter blade 110 closes the aperture 103d.

  While the main member transitions from state H to state I, the cam plate 107 rotates in the CCW direction, and the cam pin 109a traces the exposure drive area β of the cam groove 107a. Therefore, the drive lever 109 is rotated, and the shutter blade 110 is in the state of opening the aperture 103d. In this operation, the load fluctuation during driving of the motor 1 becomes large. However, the motor 1 is driven in the high advance feedback drive mode and does not get out of step.

  Further, while the main members shift from the state H to the state I, the projections 106a and 106b do not engage with the lock lever 302 and the control lever 304, respectively, so the lock lever 302 returns to the same state as the state A.

  As described above, the camera 100 performs the photographing operation of the first frame while the main members shift from the state A shown in FIG. 6A to the state I shown in FIG. Continuous shooting can be performed by repeating the shooting operation of the first frame.

  As described above, since the cam lift is almost zero in the first free drive area α and the second free drive area γ of the cam groove 107a, it does not relate to the opening and closing of the aperture 103d, which affects the exposure operation. It is an area without In addition, since driving of these regions in the shutter operation is also used to drive locking and unlocking operations of the main mirror 130, it is necessary to separately provide a drive unit and a driving circuit for locking and unlocking operations of the main mirror 130. There is no. Therefore, while the drive can be simplified and the drive in the camera 100 can be performed more efficiently, the power consumption can be reduced by the reduction of the drive unit and the drive circuit.

In the above configuration, the rotary plate 106 and the cam plate 107 are configured as separate members, but the rotary plate 106 is eliminated by providing the cam plate 107 with the projections 106 a, 106 b and 106 c of the rotary plate 106. It is also good.
[Composition and principle of motor]
FIG. 7 is a configuration explanatory view of the motor 1 used as the motor 1. Note that for the sake of explanation, some members are shown broken.

  The rotor 3 includes a magnet 2 and is rotatably controlled by a control circuit (control unit) 13 and a drive circuit 14. The magnet 2 is formed in a cylindrical shape, and the outer peripheral surface is divided in the circumferential direction, and multipole magnetization is alternately performed on different poles. In this embodiment, it is magnetized in eight divisions, that is, in eight poles. In addition, you may magnetize not only in 8 poles but in 4 poles or 12 poles.

  The first coil 4 is disposed at a first end in the axial direction of the magnet 2. The first yoke 6 is made of a soft magnetic material and is formed to face the outer peripheral surface of the magnet 2 with a gap. Further, the first yoke 6 is provided with a plurality of first magnetic pole portions 6 a axially extending from the annular main body portion and arranged at predetermined intervals in the circumferential direction. The first magnetic pole portion 6 a is excited by energization of the first coil 4. A first stator unit is configured of the first coil 4, the first yoke 6, and the magnets 2 facing the plurality of first magnetic pole portions 6 a.

  The second coil 5 is disposed at a second end opposite to the axial first end to which the axial first coil 4 of the magnet 2 is attached. The second yoke 7 is made of a soft magnetic material and is formed so as to face the outer peripheral surface of the magnet 2 with a gap. Further, the second yoke 7 includes a plurality of second magnetic pole portions 7 a axially extending from the annular main body portion and disposed at predetermined intervals in the circumferential direction. The second magnetic pole portion 7 a is excited by energization of the second coil 5. A second stator unit is configured of the second coil 5, the second yoke 7, and the magnets 2 facing the plurality of second magnetic pole portions 7a.

  The torque given to the rotor 3 can be changed by switching the poles (N pole, S pole) excited in the first magnetic pole portion 6 a and the second magnetic pole portion 7 a.

  First magnetic sensor (first detection element) 8, second magnetic sensor (second detection element) 9, third magnetic sensor (third detection element) 10 and fourth magnetic sensor (fourth detection element) 11 constitutes a detection means. Each magnetic sensor is a Hall element that detects the magnetic flux of the magnet 2 and is fixed to the motor cover 12.

  The motor cover 12 has the first yoke 6 and the second yoke 6 so that the first magnetic pole portion 6a and the second magnetic pole portion 7a are disposed so as to be shifted by approximately 90 degrees in electrical angle with respect to the magnetization phase of the magnet 2. The yoke 7 is fixed and held.

  Here, the electrical angle represents one cycle of the magnet magnetic force as 360 °. Assuming that the number of poles of the rotor is M and the mechanical angle is θ0, the electrical angle θ is expressed by the following equation.

θ = θ0 × M / 2
In the present embodiment, since the magnetization of the magnet 2 has eight poles, the electrical angle of 90 degrees is 22.5 degrees in mechanical angle.

  The control circuit 13 can drive the motor 1 through the drive circuit 14 by switching between step drive and two types of feedback drive with different amounts of advance angle. When performing step driving, the control circuit 13 controls the drive circuit 14 so as to switch the energization states of the first coil 4 and the second coil 5 at predetermined time intervals. That is, when performing step driving, the outputs of the first magnetic sensor 8, the second magnetic sensor 9, the third magnetic sensor 10, and the fourth magnetic sensor 11 are not used.

  Hereinafter, a case where the control circuit 13 performs feedback drive will be described. When the control circuit 13 performs two types of feedback driving, the outputs of the first magnetic sensor 8, the second magnetic sensor 9, the third magnetic sensor 10, and the fourth magnetic sensor 11 are used.

In the present embodiment, by providing the magnetic sensors in the positional relationship described below with respect to the yokes, a large rotational force can be obtained even at the time of switching the energization direction. FIG. 8 is an operation explanatory view of the motor 1. The state of FIG. 8A is an initial state at the time of driving.
(1) Drive in the CW direction (1-i) Low advance drive (first energization mode)
In the low advance drive mode in the CW direction, larger torque can be obtained than in the high advance drive mode described later. In the low advance drive mode in the CW direction, the pole excited to the first magnetic pole portion 6a is switched by the output signal of the first magnetic sensor 8, and the second magnetic pole portion 7a is excited by the output signal of the second magnetic sensor 9. The rotor 3 is rotated in the CW direction by switching the driven poles. The CW direction of the rotor 3 corresponds to the first rotation direction.

  In this drive mode, the conduction direction of the first coil 4 and the second coil 5 is switched in the following combination.

  When the first magnetic sensor 8 detects the S pole (switch from N pole to S pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the first magnetic pole portion 6 a to the N pole. When the first magnetic sensor 8 detects the N pole (switch from S pole to N pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the first magnetic pole portion 6 a to the S pole.

  When the second magnetic sensor 9 detects the S pole (switch from N pole to S pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the second magnetic pole portion 7 a to the S pole. When the second magnetic sensor 9 detects the N pole (switch from S pole to N pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the second magnetic pole portion 7 a to the N pole.

  In the state of FIG. 8A, the first magnetic sensor 8 and the second magnetic sensor 9 detect the south pole of the magnet 2. At this time, the control circuit 13 controls the drive circuit 14 so that the first magnetic pole portion 6a is excited to the N pole and the second magnetic pole portion 7a is excited to the S pole. As a result, rotational force in the CW direction is generated in the rotor 3 and the magnet 2.

  When the rotor 3 rotates in the CW direction from the state of FIG. 8A, as shown in FIG. 8B, the center Q1 of the S pole of the magnet 2 and the center of the first magnetic pole portion 6a oppose each other.

  When the rotor 3 rotates in the CW direction from the state of FIG. 8B, as shown in FIG. 8C, the distance between the center Q1 of the S pole of the magnet 2 and the first magnetic pole portion 6a is the magnet 2 The distance between the center Q2 of the N pole and the second magnetic pole portion 7a is the same.

  When switching the pole excited to the first magnetic pole portion 6a based on the output signal of the first magnetic sensor 8, the timing of the excitation switching of the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 is from 0 electrical advance angle The first magnetic sensor 8 is arranged to be between 45 degrees.

  Between the state of FIG. 8B and the state of FIG. 8C, the first magnetic sensor 8 detects the N pole (switch from S pole to N pole) of the magnet 2. At this time, the drive circuit 14 energizes the first coil 4 so that the first magnetic pole portion 6 a is excited to the S pole. Further, since the second magnetic sensor 9 detects the S pole of the magnet 2 during the state of FIG. 8B and the state of FIG. 8C, the second magnetic pole portion 7a is excited to the S pole. As described above, the drive circuit 14 energizes the second coil 5. As a result, rotational force in the CW direction is generated in the rotor 3 and the magnet 2.

  When the rotor 3 rotates in the CW direction from the state of FIG. 8C, as shown in FIG. 8D, the center Q2 of the N pole of the magnet 2 and the center of the second magnetic pole portion 7a oppose each other.

  When the rotor 3 rotates in the CW direction from the state of FIG. 8D, as shown in FIG. 8E, the distance between the center Q2 of the N pole of the magnet 2 and the first magnetic pole portion 6a is the magnet 2 And the distance from the center Q2 of the N pole of the second magnetic pole portion 7a.

  When switching the pole excited to the second magnetic pole portion 7a based on the output signal of the second magnetic sensor 9, the timing of the excitation switching of the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 is 0 ° electrical advance angle The second magnetic sensor 9 is arranged to be between 45 degrees.

  Between the state of FIG. 8D and the state of FIG. 8E, the second magnetic sensor 9 detects the N pole (switch from S pole to N pole) of the magnet 2. At this time, the drive circuit 14 energizes the second coil 5 so that the second magnetic pole portion 7 a is excited to the N pole. Further, since the first magnetic sensor 8 detects the N pole of the magnet 2 from the state of FIG. 8D to the state of FIG. 8E, the first magnetic pole portion 6a is excited to the S pole. As described above, the drive circuit 14 energizes the first coil 4. As a result, rotational force in the CW direction is generated in the rotor 3 and the magnet 2.

  As described above, in the low advance drive mode in the CW direction, energization of the first coil 4 and the second coil 5 is sequentially switched by the output signals of the first magnetic sensor 8 and the second magnetic sensor 9, and the rotor 3 and the magnet 2 rotate in the CW direction.

  When the rotor 3 rotates in the CW direction and switches the pole excited to the first magnetic pole portion 6a based on the output signal of the first magnetic sensor 8, the excitation of the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 The switching timing is between 0 and 45 degrees of electrical advance. That is, in the first magnetic sensor 8, the advance amount from the position where the electrical advance angle is 0 degrees from the excitation switching timing in the first magnetic pole portion 6a is the electrical advance from the excitation switching timing in the first magnetic pole portion 6a. It is disposed at a position smaller than the retardation amount from the position of 90 degrees.

When the rotor 3 rotates in the CW direction and switches the pole excited to the second magnetic pole portion 7a based on the output signal of the second magnetic sensor 9, the excitation of the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 The switching timing is between 0 degrees and 45 degrees of electrical advance. That is, in the second magnetic sensor 9, the advance amount from the position where the electrical advance angle is 0 degree from the excitation switching timing in the second magnetic pole portion 7a is the electrical advance from the excitation switching timing in the second magnetic pole portion 7a. It is disposed at a position smaller than the retardation amount from the position of 90 degrees.
(1-ii) High advance angle drive (second energization mode)
In the high advance drive mode in the CW direction, the motor 1 can be rotated at a higher speed than the low advance drive mode described above. In the high advance drive mode in the CW direction, the pole excited to the first magnetic pole portion 6a is switched by the output signal of the third magnetic sensor 10, and the second magnetic pole portion 7a is excited by the output signal of the fourth magnetic sensor 11. The rotor 3 is rotated in the CW direction by switching the driven poles.

  In this drive mode, the conduction direction of the first coil 4 and the second coil 5 is switched in the following combination.

  When the third magnetic sensor 10 detects the S pole (switch from N pole to S pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the first magnetic pole portion 6 a to the N pole. When the third magnetic sensor 10 detects the N pole (switch from S pole to N pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the first magnetic pole portion 6 a to the S pole.

  When the fourth magnetic sensor 11 detects the S pole (switch from N pole to S pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the second magnetic pole portion 7 a to the S pole. When the fourth magnetic sensor 11 detects the N pole (switch from S pole to N pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the second magnetic pole portion 7 a to the N pole.

  In the state of FIG. 8A, the third magnetic sensor 10 and the fourth magnetic sensor 11 detect the south pole of the magnet 2. At this time, the control circuit 13 controls the drive circuit 14 so that the first magnetic pole portion 6a is excited to the N pole and the second magnetic pole portion 7a is excited to the S pole. As a result, rotational force in the CW direction is generated in the rotor 3 and the magnet 2.

  When the rotor 3 rotates in the CW direction from the state of FIG. 8A, as shown in FIG. 8B, the center Q1 of the S pole of the magnet 2 and the center of the first magnetic pole portion 6a oppose each other.

  When switching the pole excited to the first magnetic pole portion 6a based on the output signal of the third magnetic sensor 10, the excitation switching timing of the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 is 45 degrees electrical advance angle 90 The third magnetic sensor 10 is disposed so as to be between two degrees.

  Between the state of FIG. 8A and the state of FIG. 8B, the third magnetic sensor 10 detects the N pole (switch from S pole to N pole) of the magnet 2. At this time, the drive circuit 14 energizes the first coil 4 so that the first magnetic pole portion 6 a is excited to the S pole. Further, since the fourth magnetic sensor 11 detects the S pole of the magnet 2 between the state of FIG. 8A and the state of FIG. 8B, the second magnetic pole portion 7a is excited to the S pole. As described above, the drive circuit 14 energizes the second coil 5. As a result, rotational force in the CW direction is generated in the rotor 3 and the magnet 2.

  When the rotor 3 is rotated in the CW direction from the state of FIG. 8 (b), the state of FIG. 8 (c) passes, and as shown in FIG. 8 (d), the center Q2 of the N pole of the magnet 2 and the second Q The centers of the magnetic pole portions 7a face each other.

  When switching the pole excited to the second magnetic pole portion 7a based on the output signal of the fourth magnetic sensor 11, the excitation switching timing of the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 is 45 degrees electrical advance angle 90 The fourth magnetic sensor 11 is disposed so as to be between two degrees.

  Between the state of FIG. 8C and the state of FIG. 8D, the fourth magnetic sensor 11 detects the N pole (switch from S pole to N pole) of the magnet 2. At this time, the drive circuit 14 energizes the second coil 5 so that the second magnetic pole portion 7 a is excited to the N pole. Further, since the third magnetic sensor 10 detects the N pole of the magnet 2 from the state of FIG. 8C to the state of FIG. 8D, the first magnetic pole portion 6a is excited to the S pole. As described above, the drive circuit 14 energizes the first coil 4. As a result, rotational force in the CW direction is generated in the rotor 3 and the magnet 2.

  As described above, in the high advance drive mode in the CW direction, the energization of the first coil 4 and the second coil 5 is sequentially switched by the output signals of the third magnetic sensor 10 and the fourth magnetic sensor 11, and the rotor 3 and the magnet 2 rotate in the CW direction.

  When the rotor 3 rotates in the CW direction and switches the pole excited in the first magnetic pole portion 6a based on the output signal of the third magnetic sensor 10, the excitation of the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 The switching timing is between 45 degrees and 90 degrees of electrical advance. That is, in the third magnetic sensor 10, the advance amount from the position where the electrical advance angle is 0 degrees from the excitation switching timing in the first magnetic pole portion 6a is the electrical advance from the excitation switching timing in the first magnetic pole portion 6a. It is disposed at a position where the retardation amount from the position of 90 degrees is larger.

When the rotor 3 rotates in the CW direction and switches the pole excited to the second magnetic pole portion 7a based on the output of the fourth magnetic sensor 11, the excitation switching of the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 The timing is between 45 degrees and 90 degrees of electrical advance. That is, in the fourth magnetic sensor 11, the advance amount from the position where the electrical advance angle is 0 degrees from the excitation switching timing in the second magnetic pole portion 7a is the electrical advance from the excitation switching timing in the second magnetic pole portion 7a. It is disposed at a position where the retardation amount from the position of 90 degrees is larger.
(2) Drive in the CCW direction (2-i) Low advance drive (third energization mode)
In the low advance drive mode in the CCW direction, larger torque can be obtained than in the high advance drive mode. In the low advance drive mode in the CCW direction, the pole excited to the first magnetic pole portion 6a is switched by the output signal of the third magnetic sensor 10, and the second magnetic pole portion 7a is excited by the output signal of the fourth magnetic sensor 11. The rotor 3 is rotated in the CCW direction by switching the driven poles. The CCW direction of the rotor 3 corresponds to a second rotation direction opposite to the first rotation direction.

  In this drive mode, the conduction direction of the first coil 4 and the second coil 5 is switched in the following combination.

  When the third magnetic sensor 10 detects the S pole (switch from N pole to S pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the first magnetic pole portion 6 a to the S pole. When the third magnetic sensor 10 detects the N pole (switch from S pole to N pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the first magnetic pole portion 6 a to the N pole.

  When the fourth magnetic sensor 11 detects the S pole (switch from N pole to S pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the second magnetic pole portion 7 a to the N pole. When the fourth magnetic sensor 11 detects the N pole (switch from S pole to N pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the second magnetic pole portion 7 a to the S pole.

  In the state of FIG. 8A, the third magnetic sensor 10 and the fourth magnetic sensor 11 detect the south pole of the magnet 2. At this time, the control circuit 13 controls the drive circuit 14 so that the first magnetic pole portion 6a is excited to the S pole and the second magnetic pole portion 7a is excited to the N pole. As a result, a rotational force in the CCW direction is generated in the rotor 3 and the magnet 2.

  When the rotor 3 rotates in the CCW direction from the state of FIG. 8A, the center Q1 of the S pole of the magnet 2 and the center of the second magnetic pole portion 7a oppose each other as shown in FIG.

  When the rotor 3 is rotated in the CCW direction from the state of FIG. 8F, as shown in FIG. 8G, the distance between the center Q1 of the S pole of the magnet 2 and the second magnetic pole portion 7a is the magnet 2 Is the same as the distance between the center Q3 of the N pole and the first magnetic pole portion 6a.

  When switching the pole excited to the second magnetic pole portion 7a based on the output signal of the fourth magnetic sensor 11, the timing of the excitation switching of the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 is 0 ° electrical advance angle The fourth magnetic sensor 11 is disposed to be between 45 degrees.

  Between the state of FIG. 8F and the state of FIG. 8G, the N pole (switch from S pole to N pole) of the magnet 2 is detected. At this time, the drive circuit 14 energizes the second coil 5 so that the second magnetic pole portion 7 a is excited to the S pole. Further, since the third magnetic sensor 10 detects the S pole of the magnet 2 during the state of FIG. 8F to the state of FIG. 8G, the first magnetic pole portion 6a is excited to the S pole. As described above, the drive circuit 14 energizes the first coil 4. As a result, a rotational force in the CCW direction is generated in the rotor 3 and the magnet 2.

  When the rotor 3 rotates in the CCW direction from the state of FIG. 8 (g), as shown in FIG. 8 (h), the center Q3 of the N pole of the magnet 2 and the center of the first magnetic pole portion 6a oppose each other.

  When the rotor 3 rotates in the CCW direction from the state of FIG. 8 (h), as shown in FIG. 8 (i), the distance between the center Q3 of the N pole of the magnet 2 and the first magnetic pole portion 6a is the magnet 2 The distance between the center Q3 of the N pole and the second magnetic pole portion 7a is the same.

  When switching the pole excited to the first magnetic pole portion 6a based on the output signal of the third magnetic sensor 10, the excitation switching timing of the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 is 0 ° electrical advance angle 45 The third magnetic sensor 10 is disposed so as to be between two degrees.

  During the state of FIG. 8H and the state of FIG. 8I, the third magnetic sensor 10 detects the N pole (switching from the S pole to the N pole) of the magnet 2. At this time, the drive circuit 14 energizes the first coil 4 so that the first magnetic pole portion 6 a is excited to the N pole. Further, since the fourth magnetic sensor 11 detects the N pole of the magnet 2 from the state of FIG. 8H to the state of FIG. 8I, the second magnetic pole portion 7a is excited to the S pole. As described above, the drive circuit 14 energizes the second coil 5. As a result, a rotational force in the CCW direction is generated in the rotor 3 and the magnet 2.

  As described above, in the low advance drive mode in the CCW direction, the energization to the first coil 4 and the second coil 5 is sequentially switched by the output signals of the third magnetic sensor 10 and the fourth magnetic sensor 11, and the rotor 3 and magnet 2 rotate in the CCW direction.

  When the rotor 3 rotates in the CCW direction and switches the pole excited to the first magnetic pole portion 6a based on the output signal of the third magnetic sensor 10, the excitation of the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 The switching timing is between 0 and 45 degrees of electrical advance.

When the rotor 3 rotates in the CCW direction and switches the pole excited to the second magnetic pole portion 7a based on the output of the fourth magnetic sensor 11, the excitation switching of the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 The timing is between 0 and 45 degrees of electrical advance.
(2-ii) High advance angle drive (fourth energization mode)
In the high advance drive mode in the CCW direction, the motor 1 can be rotated at a higher speed than in the low advance drive mode. In the high advance drive mode in the CCW direction, the pole excited to the first magnetic pole portion 6a is switched based on the output signal of the first magnetic sensor 8, and the second magnetic pole is switched based on the output signal of the second magnetic sensor 9. The rotor 3 is rotated in the CCW direction by switching the pole excited in the section 7a.

  In this drive mode, the conduction direction of the first coil 4 and the second coil 5 is switched in the following combination.

  When the first magnetic sensor 8 detects the S pole (switch from N pole to S pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the first magnetic pole portion 6 a to the S pole. When the first magnetic sensor 8 detects the N pole (switch from S pole to N pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the first magnetic pole portion 6 a to the N pole.

  When the second magnetic sensor 9 detects the S pole (switch from N pole to S pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the second magnetic pole portion 7 a to the N pole. When the second magnetic sensor 9 detects the N pole (switch from S pole to N pole) of the magnet 2, the detection signal is input to the control circuit 13. Then, the control circuit 13 controls the drive circuit 14 so as to excite the second magnetic pole portion 7 a to the S pole.

  In the state of FIG. 8A, the first magnetic sensor 8 and the second magnetic sensor 9 detect the south pole of the magnet 2. At this time, the control circuit 13 controls the drive circuit 14 so that the first magnetic pole portion 6a is excited to the S pole and the second magnetic pole portion 7a is excited to the N pole. As a result, a rotational force in the CCW direction is generated in the rotor 3 and the magnet 2.

  When the rotor 3 rotates in the CCW direction from the state of FIG. 8A, the center Q1 of the S pole of the magnet 2 and the center of the second magnetic pole portion 7a oppose each other as shown in FIG.

  When switching the pole excited to the second magnetic pole portion 7a based on the output signal of the second magnetic sensor 9, the excitation switching timing of the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 is 45 degrees electrical advance angle 90 The second magnetic sensor 9 is disposed so as to be between two degrees.

  Between the state of FIG. 8A and the state of FIG. 8F, the second magnetic sensor 9 detects the N pole (switch from S pole to N pole) of the magnet 2. At this time, the drive circuit 14 energizes the second coil 5 so that the second magnetic pole portion 7 a is excited to the N pole. Further, since the first magnetic sensor 8 detects the S pole of the magnet 2 from the state of FIG. 8A to the state of FIG. 8F, the first magnetic pole portion 6a is excited to the S pole. As described above, the drive circuit 14 energizes the first coil 4. As a result, a rotational force in the CCW direction is generated in the rotor 3 and the magnet 2.

  When the rotor 3 rotates in the CCW direction from the state of FIG. 8 (f), it passes the state of FIG. 8 (g), and as shown in FIG. 8 (h), the center Q3 of the N pole of the magnet 2 and the first Q The centers of the magnetic pole portions 6a face each other.

  When switching the pole excited to the first magnetic pole portion 6a based on the output signal of the first magnetic sensor 8, the excitation timing of the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 is 45 degrees of electrical advance angle 90 degrees The first magnetic sensor 8 is disposed so as to be in between.

  Between the state of FIG. 8G and the state of FIG. 8H, the first magnetic sensor 8 detects the N pole (switch from S pole to N pole) of the magnet 2. At this time, the drive circuit 14 energizes the first coil 4 so that the first magnetic pole portion 6 a is excited to the N pole. Further, since the second magnetic sensor 9 detects the N pole of the magnet 2 from the state of FIG. 8G to the state of FIG. 8H, the second magnetic pole portion 7a is excited to the S pole. As described above, in the drive circuit 14, the second coil 5 is energized. As a result, a rotational force in the CCW direction is generated in the rotor 3 and the magnet 2.

  As described above, in the high advance drive mode in the CCW direction, the energization to the first coil 4 and the second coil 5 is sequentially switched by the outputs of the first magnetic sensor 8 and the second magnetic sensor 9, and the rotor 3 The magnet 2 rotates in the CCW direction.

  When the rotor 3 rotates in the CCW direction and switches the pole excited to the first magnetic pole portion 6a based on the output signal of the first magnetic sensor 8, the excitation of the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 The switching timing is between 45 degrees and 90 degrees of electrical advance.

  When the rotor 3 rotates in the CCW direction and switches the pole excited to the second magnetic pole portion 7a based on the output of the second magnetic sensor 9, the excitation switching of the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 The timing is between 45 degrees and 90 degrees of electrical advance.

  FIG. 9 is a layout explanatory view of the first magnetic sensor 8, the second magnetic sensor 9, the third magnetic sensor 10 and the fourth magnetic sensor 11.

  The first magnetic sensor 8 is disposed at a position satisfying the following conditions.

  (A) When switching the pole excited to the first magnetic pole portion 6a based on the output signal of the first magnetic sensor 8 when the rotor 3 rotates in the CW direction, the first magnetic pole portion 6a relative to the rotational position of the rotor 3 The excitation switching timing is between 0 and 45 degrees of electrical advance (see FIG. 9A).

  (B) When switching the pole excited to the first magnetic pole portion 6a based on the output signal of the first magnetic sensor 8 when the rotor 3 rotates in the CCW direction, the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 The excitation switching timing is between 45 degrees and 90 degrees of electrical advance (see FIG. 9C).

  The second magnetic sensor 9 is disposed at a position satisfying the following conditions.

  (C) When switching the pole excited in the second magnetic pole portion 7a based on the output signal of the second magnetic sensor 9 when the rotor 3 rotates in the CW direction, the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 The excitation switching timing is between 0 and 45 degrees of electrical advance (see FIG. 9B).

  (D) When the pole excited to the second magnetic pole portion 7a is switched based on the output signal of the second magnetic sensor 9 when the rotor 3 rotates in the CCW direction, the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 The excitation switching timing is between 45 and 90 degrees of electrical advance (see FIG. 9 (d)).

  The third magnetic sensor 10 is disposed at a position satisfying the following conditions.

  (E) When the pole excited in the first magnetic pole portion 6a is switched based on the output signal of the third magnetic sensor 10 when the rotor 3 rotates in the CW direction, the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 The excitation switching timing is between 45 and 90 degrees of electrical advance (see FIG. 9A).

  (F) When the pole excited to the first magnetic pole portion 6a is switched based on the output signal of the third magnetic sensor 10 when the rotor 3 rotates in the CCW direction, the first magnetic pole portion 6a with respect to the rotational position of the rotor 3 The excitation switching timing is between 0 and 45 degrees of electrical advance (see FIG. 9C).

  The fourth magnetic sensor 11 is disposed at a position satisfying the following conditions.

  (G) When the pole excited to the second magnetic pole portion 7a is switched based on the output signal of the fourth magnetic sensor 11 when the rotor 3 rotates in the CW direction, the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 The excitation switching timing is between 45 and 90 degrees of electrical advance (see FIG. 9B).

  (H) When the pole excited to the second magnetic pole portion 7a is switched based on the output signal of the fourth magnetic sensor 11 when the rotor 3 rotates in the CCW direction, the second magnetic pole portion 7a with respect to the rotational position of the rotor 3 The excitation switching timing is between 0 and 45 degrees of electrical advance (see FIG. 9 (d)).

  In the present embodiment, each magnetic sensor is disposed in the following range in consideration of a magnetization error of a magnet, a sensor dimension error, a yoke error, and the like.

  In the first magnetic sensor 8, the excitation switching timing of the first magnetic pole portion 6 a is between 14.4 to 33.6 degrees of electric advance angle when the rotor 3 rotates in the CW direction, and the rotation of the rotor 3 in the CCW direction It is arranged in the range which becomes between 56.4 degrees and 75.6 degrees of electric advance angles at the time of movement.

  In the second magnetic sensor 9, the excitation switching timing of the second magnetic pole portion 7a is between 14.4 to 33.6 degrees of electric advance angle when the rotor 3 rotates in the CW direction, and the rotation of the rotor 3 in the CCW direction It is arranged in the range which becomes between 56.4 degrees and 75.6 degrees of electric advance angles at the time of movement.

  In the third magnetic sensor 10, the excitation switching timing of the first magnetic pole portion 6a is between 56.4 and 75.6 degrees of electric advance angle when the rotor 3 rotates in the CW direction, and the rotation of the rotor 3 in the CCW direction It is placed in the range of 14.4 degrees to 33.6 degrees of electric advance angle at the time of movement.

  In the fourth magnetic sensor 11, the excitation switching timing of the second magnetic pole portion 7a is between 56.4 and 75.6 degrees of electric advance angle when the rotor 3 rotates in the CW direction, and the rotation of the rotor 3 in the CCW direction It is placed in the range of 14.4 degrees to 33.6 degrees of electric advance angle at the time of movement.

  Further, the middle point of the line connecting the first magnetic sensor 8 and the third magnetic sensor 10 is a position where the excitation switching timing of the first magnetic pole portion 6a is 45 degrees in electrical advance. The middle point of the line segment connecting the second magnetic sensor 9 and the fourth magnetic sensor 11 is a position where the excitation switching timing of the second magnetic pole portion 7a is 45 degrees in electrical advance. As a result, in the present embodiment, the variation of the drive characteristics due to the rotation in the CW direction or the rotation in the CCW direction is reduced.

  In the present embodiment, a sensor unit which is one unit by the first magnetic sensor 8 and the third magnetic sensor 10 and one unit by the second magnetic sensor 9 and the fourth magnetic sensor 11 is used. In this case, when the rotor 3 rotates in the CW direction, the first magnetic sensor 8 is disposed at a position where the excitation switching timing of the first magnetic pole portion 6a is 21 degrees of electrical advance, and the excitation switching timing of the first magnetic pole portion 6a The third magnetic sensor 10 is disposed at a position where the electrical advance angle is 69 degrees. The second magnetic sensor 9 is disposed at a position where the excitation switching timing of the second magnetic pole portion 7a is 21 degrees of electrical advance when the rotor 3 rotates in the CW direction, and the excitation switching timing of the second magnetic pole portion 7a is electrical The fourth magnetic sensor 11 is disposed at a position where the advance angle is 69 degrees.

  As mentioned above, although the preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

100 Digital SLR Camera Body (Imaging Device)
107 Cam plate (cam member)
130 Main mirror (mirror member)
302 Lock lever (lock member)

Claims (7)

A light shielding means comprising a light shielding member movable between a closed position closing the opening and an open position opening the opening;
A cam member comprising a first cam region and a second cam region engaged with the light blocking means;
A mirror unit movable between a mirror-up state retracted to the outside of the imaging light path and a mirror-down state located in the imaging light path;
And a lock member movable between a lock position for restricting the movement of the mirror unit and a lock release position for allowing the movement of the mirror unit.
While the light blocking means is engaged with the first cam area, the light blocking member is located at the closed position or the open position, and while the light blocking means is engaged with the second cam area The light blocking member moves between the closed position and the open position;
The image pickup apparatus, wherein the lock member moves between the lock position and the lock release position while the light shielding unit is engaged with the first cam area.   The image pickup apparatus according to claim 1, wherein the mirror unit moves between the mirror-up state and the mirror-down state while the light shielding means is engaged with the first cam area. . It further has a mirror moving member for moving the mirror unit,
The locking member engages the mirror moving member to limit movement of the mirror unit in the locked position, and is separated from the mirror moving member to allow movement of the mirror unit in the unlocked position. The image pickup apparatus according to claim 1 or 2, wherein   The control device according to any one of claims 1 to 3, further comprising a restricting member engaged with the lock member so as to restrict the movement of the lock member while the lock member is in the unlocking position. An imaging device according to item 1. A mirror moving member that engages with the lock member when the lock member is in the lock position, and separates from the lock member when the lock member is in the lock release position, and moves the mirror unit;
A restricting member engaged with the lock member so as to restrict movement of the lock member while the lock member is in the unlocked position;
A first convex portion pushing the lock member so as to release the engagement between the lock member and the mirror moving member;
The imaging device according to any one of claims 1 to 4, further comprising: a second convex portion that pushes the regulating member so as to release the engagement between the locking member and the regulating member. .   The imaging device according to claim 5, wherein the first and second convex portions are provided on the cam member. It further comprises a moving member that moves with the movement of the cam member,
The imaging device according to claim 5, wherein the first and second convex portions are provided on the moving member.