JP2019095479A - Blade driving device and imaging device - Google Patents

Abstract

To configure a blade driving member by two members, and achieve thinness of the device.SOLUTION: A blade driving device comprises: a blade that opens/closes an aperture of a base plate; a driving spring that travels the blade and exerts urging force for exposing the aperture; a first rotary member that is linked to the driving spring; a second rotary member that is rotatably supported on a co-axis with the first rotary member, and opens/closes the blade; a charge mechanism that rotates the first rotary member to a charge position to charge the driving spring; a holding mechanism that holds the first rotary member at the charge position by magnetic force; and a lock mechanism that locks the second rotary member and can keep the blade in an open state. The first rotary member includes a support part that supports an armature, and the support part has a wall part that extends in an optical axis direction, and faces the armature. At a portion on an opposite side of the armature of the wall part, an abutting part is formed that abuts with the second rotary member and rotates the second rotary member as well, together with the first rotary member.SELECTED DRAWING: Figure 30

Description

  The present invention relates to a blade driving device and an imaging device.

  Among mirrorless cameras and the like, those employing a shutter of a normally open system are known. As a configuration example of such a shutter, one has been proposed in which a drive member for operating the blades is a two-member configuration of a member for charging the drive spring and a member for opening and closing the blades (Patent Document 1 etc.).

Patent No. 4931986

  However, if the drive member is simply made into a two-member configuration, the apparatus becomes larger. In particular, in the configuration in which the two members are rotated coaxially in the optical axis direction, the device tends to be thick in the optical axis direction.

  The present invention is intended to reduce the thickness of the device in the optical axis direction, when the driving member of the blade is composed of two members.

According to the invention
A base plate forming an opening through which light passes;
A blade for opening and closing the opening;
A driving spring which exerts a biasing force for causing the blade to travel to expose the opening;
A first pivoting member rotatably supported about an axis in the optical axis direction and coupled to the drive spring;
A second pivoting member rotatably supported coaxially with the first pivoting member for opening and closing the blades;
A charge mechanism for rotating the first rotation member to a charge position to charge the drive spring;
A holding mechanism for holding the first rotating member at the charge position by magnetic force;
A locking mechanism capable of locking the second rotation member to maintain the blade in the open state;
A blade drive comprising:
The first pivoting member includes a support that supports an armature held magnetically by the holding mechanism,
The support portion has a wall portion extending in the optical axis direction and facing the armature.
When the first pivoting member is pivoted by the biasing force of the drive spring, the first pivoting member abuts against the second pivoting member at a portion of the wall opposite to the armature. An abutment portion is formed to rotate the second rotation member as well as the member.
There is provided a blade drive device characterized in that:

  According to the present invention, thinning of the device in the optical axis direction can be achieved when the driving member of the blade is constituted by two members.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the whole structure of the imaging device concerning embodiment of this invention. FIG. 1 is a perspective view of a shutter according to an embodiment of the present invention. FIG. 3 is a perspective view showing an internal mechanism of the shutter of FIG. 2; FIG. 3 is a plan view showing an internal mechanism of the shutter of FIG. 2; The disassembled perspective view of the shutter of FIG. Explanatory drawing of a ground plane. Explanatory drawing of a blade | wing mechanism. Explanatory drawing of a blade | wing mechanism. Explanatory drawing of a blade | wing mechanism. Explanatory drawing of a drive mechanism. Explanatory drawing of a drive mechanism. Explanatory drawing of the drive member for trailing curtains. The perspective view of the drive member for front curtains, and its disassembled perspective view. The disassembled perspective view of a locking mechanism. The perspective view which looked at the locking lever and the control lever from two directions. Explanatory drawing of the support structure of a motor. Explanatory drawing of the support structure of a motor. Explanatory drawing of the support structure of a motor. Explanatory drawing of the guide mechanism of a charge slider. The perspective view of a charge slider. Structure explanatory drawing of a charge mechanism. Structure explanatory drawing of a charge mechanism. Explanatory drawing of a gear train. Structure explanatory drawing of a charge mechanism. Operation | movement explanatory drawing of a charge mechanism. Operation | movement explanatory drawing of a charge mechanism. Operation explanatory drawing of the shutter of FIG. Operation explanatory drawing of the shutter of FIG. Operation explanatory drawing of the shutter of FIG. (A) And (B) is a perspective view of the main-body part of the drive member for front curtains. (A) thru | or (C) are figures which show the contact state of the drive member for front curtains.

<Imaging device>
FIG. 1 is a diagram showing an entire configuration of an imaging device 10 according to an embodiment of the present invention. The imaging device 10 is, for example, a mirrorless camera. The imaging device 10 includes a lens unit 1, a shutter 2, and an imaging element 3. The lens unit 1 includes a lens group for imaging light from a subject and a drive mechanism thereof. The imaging element 3 is an element that photoelectrically converts an object image formed by the lens unit 1 and is, for example, a CMOS image sensor. The shutter 2 is disposed between the lens unit 1 and the imaging device 3 on the photographing optical axis 1a, and adjusts the exposure time and the like to the imaging device 3 by opening and closing the blade group.

  An analog image signal output from the imaging device 3 is converted into a digital image signal by an AFE (Analog Front End) 4. A DSP (Digital Signal Processor) 5 performs various image processing, compression / decompression processing, and the like on the digital image signal output from the AFE 4. A storage medium 5 a and a RAM 5 b are connected to the DSP 5. The RAM 5 b is used, for example, to temporarily store image data. The storage medium 5a is, for example, a memory card, and is used to store a captured image. The display 6 is an electronic image display device such as a liquid crystal display (LCD) and displays a photographed image, various menu screens, and the like.

  The CPU 7 controls the entire imaging device 10. The CPU 7 controls the various drive circuits 7 b based on the detection results of the various sensors 7 a. The sensor 7a includes, for example, a sensor that detects a power supply voltage of the imaging device 10, a sensor that detects a temperature, and various sensors provided in the lens unit 1 and the shutter 2. The drive circuit 7 b includes, for example, a timing generator that supplies a drive signal to the imaging device 3, and a drive circuit of an actuator provided in the lens unit 1 or the shutter 2 or the like.

<Shutter>
The shutter 2 of the present embodiment is a focal plane shutter. The shutter 2 will be described with reference to FIGS. In each drawing, arrows X, Y, and Z indicate directions orthogonal to one another, the Z direction is a direction parallel to the optical axis 1 a, and the Y direction is a direction parallel to the traveling direction of the blade. In some of the drawings, the components of the shutter 2 may be illustrated in a transmissive manner or may be omitted.

<1. Overall configuration and layout>
The overall configuration of the shutter 2 and the layout of the mechanism will be described with reference to FIGS. 2 is a perspective view of the shutter 2, FIGS. 3 and 4 are views showing an internal mechanism of the shutter 2, FIG. 5 is an exploded perspective view of the shutter 2, and FIG. 6 is a perspective view of the ground plate 30.

  The shutter 2 is roughly divided into a blade portion 20 which exposes / shields the object light to the image pickup element 3 and a mechanism portion 21 which operates the blade. The blade portion 20 has a rectangular shape thinner than the mechanical portion 21, and the shutter 2 has an L shape as a whole in a side view (Y direction). The mechanical portion 21 has a rectangular parallelepiped shape having a thickness equivalent to the diameter of the motor 81. Conversely, the thickness of the shutter 70 in the Z direction is at most the same as the diameter of the motor 81. By locating the mechanism unit 21 to the side of the blade unit 20 while reducing the thickness of the blade unit 20 and reducing the installation space between the shutter 2 and the imaging device 3 in the optical axis direction, the housing space in the imaging device 10 Can be used effectively. In addition, the shutter 2 has a rectangular shape as a whole and is configured to be compact, which is advantageous for an imaging device having a narrow internal space, such as a mirrorless camera.

  The shutter 2 uses a base plate (base plate) 30 as a basic support, and the components are mounted on the base plate 30. The ground plate 30 integrally has an opening forming portion 31 constituting the blade portion 20 and a mechanism supporting portion 32 constituting the mechanism portion 21 and is, for example, a member made of synthetic resin.

  An opening 31 a through which subject light passes is formed in the opening forming unit 31. The one surface side of the opening forming portion 31 is covered with the cover plate 33, and the partition plate 34 is disposed between the opening forming portion 31 and the cover plate 33. In the cover plate 33 and the partition plate 34, an opening 33a overlapping with the opening 31a and an opening 34a are formed. The other surface side (subject side) of the opening forming portion 31 is also covered with the cover plate 36. The cover plate 36 is also formed with an opening 36a overlapping the opening 31a. The openings 31a, 33a, 34a and 36a have a rectangular shape, and the normal direction is the Z direction, and the plane direction is the X direction and the Y direction. The subject light passes through the opening 36 a, the opening 31 a, the opening 34 a, and the opening 33 a in order to expose the imaging element 3.

  The partition plate 34 divides the blade chamber between the opening forming portion 31 and the cover plate 33 into two in the Z direction into a space for the front curtain and a space for the rear curtain. The shutter 2 is provided with a blade mechanism 40 for the front curtain and a blade mechanism 50 for the rear curtain, and in the blade chamber, a blade group 41 constituting the front curtain and a blade group 51 constituting the rear curtain It is housed. FIG. 4 shows a state in which the cover plate 33 and the partition plate 34 are removed.

  In the mechanism portion 21, a drive mechanism 60 for driving the blade mechanisms 40 and 50, a locking mechanism 70 capable of maintaining the blade group 41 in an open state, and a charge mechanism 80 for charging the drive mechanism 60 are arranged. There is. Further, an MG base plate 35 which also serves as a cover member for covering these mechanisms, and a cover member 37 for covering the MG base plate 35 are provided. FIG. 3 shows a state in which the MG base plate 35 and the cover member 37 are removed. MG ground plate 35 and cover member 37 prevent the entry of dust into drive mechanism 60, locking mechanism 70 and charge mechanism 80.

  The charge mechanism 80 includes a motor 81 as a drive source, a charge slider 82 for performing a charge operation on the drive mechanism 60 by the drive force of the motor 81, and a gear train 85 for transmitting the drive force of the motor 81 to the charge slider 82. Including. In the case of the present embodiment, the charge mechanism 80 includes the motor 81, but it is also possible to use a motor provided on the imaging device 10 side as the motor 81. That is, the charge mechanism 80 may be a mechanism having a unique motor, or may be a mechanism that does not have a unique motor and receives a driving force from another motor.

  The motor 81 is disposed on the side of the opening 31a in the X direction so that the rotation shaft 81a is in the Y direction. In other words, it is disposed along one side of the periphery of the rectangular opening 31a. In order to improve the operating speed of the shutter 2, a motor with a relatively high output is required as the motor 81, but the size of the motor generally increases in proportion to the output. By arranging the motor 81 as in the present embodiment, when viewed in the Y direction, the body 81b of the motor 81 can be accommodated in the traveling and storing range Yw (see FIG. 4) of the blade groups 41 and 51. High power motors can be arranged relatively compactly.

  As another arrangement mode of the motor 81, for example, it is conceivable to arrange the rotary shaft 81a in the Z direction, but when the overall length of the motor 81 is long as in the present embodiment, the shutter 2 is in the Z direction. become longer. Further, as another arrangement aspect of the motor 81, it is conceivable to arrange the rotary shaft 81a in the X direction, but as in this embodiment, the motor 81 is arranged on the side of the opening 31a in the X direction. In this case, the shutter 2 becomes longer in the X direction. Moreover, since the digital camera generally secures the accommodation space on the left and right of the shutter more easily than the upper and lower sides, when the motor 81 is disposed to the side of the opening 31a in the Y direction, it is disadvantageous in terms of accommodation to the imaging device 10. There is a case. Although such other arrangement modes can be adopted, the arrangement mode of the motor 81 in this embodiment is advantageous in that both the high performance and the miniaturization of the shutter 2 are compatible.

  In the case of this embodiment, the charge mechanism 80 performs the charge operation on the drive mechanism 60 by moving the charge slider 82 in the direction (Y direction) intersecting with the optical axis direction (Z direction) by the driving force of the motor 81. . By performing the charge operation by the linear movement of the charge slider 82 in the Y direction, the shutter 2 can be miniaturized in the X direction as compared with the configuration in which the member for charge is rotated. Further, the reciprocating movement range of the charge slider 82 is within the traveling and storing range Yw (see FIG. 4) of the blade groups 41 and 51, and the shutter 2 is not enlarged in the Y direction.

  Drive mechanism 60 drives blade mechanisms 40 and 50 while receiving a charge operation by charge mechanism 80. For this reason, it is advantageous in terms of mechanism and downsizing to achieve arrangement of the blade mechanisms 40 and 50 and the charge mechanism 80 adjacent to the drive mechanism 60. In the case of this embodiment, the drive mechanism 60 is disposed in the region Xw between the motor 81 and the opening 31 a, and the charge slider 82 is disposed between the motor 81 and the drive mechanism 60. With such an arrangement, the drive mechanism 60 is disposed adjacent to the blade mechanisms 40 and 50 and the charge mechanism 80, which is mechanically advantageous. Moreover, since the rotational axis direction of the motor 81 and the moving direction of the charge slider 82 are both in the Y direction, each mechanism can be concentrated in a narrow area in the X direction, and the shutter 2 can be miniaturized.

  In the case of this embodiment, the gear train 85 is disposed on one end side (the rotation shaft 81 a side) of the motor 81 in the Y direction, and the locking mechanism 70 is disposed on the other end side. By arranging the locking mechanism 70 and the gear train 85 symmetrically in the space on both sides of the body 81 b of the motor 81 in the Y direction, the shutter 2 can be miniaturized in the Y direction. A worm gear 81 c is provided on a rotation shaft 81 a of the motor 81, and the worm gear 81 c meshes with a worm wheel 850 a of a gear 850 of the gear train 85. At this portion, the rotational axis direction is converted from the Y direction (motor 81 side) to the Z direction (gear train 85 side). Since each gear of the gear train 85 has the rotation axis in the Z direction, the thickness in the Z direction of the mechanism portion 21 of the shutter 2 can be reduced.

<2. Feather mechanism>
The configuration of the blade mechanisms 40 and 50 will be described with reference to FIGS. 5, 6 and 7-9. FIG. 7 is an explanatory view of the blade mechanisms 40 and 50, and FIGS. 8 and 9 are explanatory views of the blade mechanism 40. As shown in FIG. In FIG. 7, state ST1 indicates a state in which blade group 41 is in an open state and blade group 51 is in a closed state, and state ST2 indicates a state in which blade group 41 is in a closed state and blade group 51 is in an open state. The open state is a state in which the opening 31a is not covered, and the closed state is a state in which the opening 31a is covered. In FIG. 7 etc., the outline of the blade hidden behind is shown by a solid line so that the overlap of the blades and the blades can be visually understood.

  The blade mechanism 40 includes a blade group 41, a main arm 42, a sub arm 43 and a spring 44, and constitutes a front curtain. The blade mechanism 50 includes a blade group 51, a main arm 52, a sub arm 53, and a spring 54, and constitutes a rear curtain. In the case of the present embodiment, the blade groups 41 and 51 are respectively composed of blades 41a to 41d and 51a to 51d. However, the number of blades is not limited to four. Each blade is formed of, for example, a resin sheet (or a light shielding material or a composite material such as a metal plate) to which a black paint is applied. The blades 41a to 41d are connected to the main arm 42 and the sub arm 43, and constitute a parallel link mechanism in which the Y direction is the traveling direction of the blades 41a to 41d. The blades 51a to 51d are connected to the main arm 52 and the sub arm 53, and constitute a parallel link mechanism in which the Y direction is the traveling direction of the blades 51a to 51d.

  The main arm 42 includes an axial hole 42 a and an engagement hole 42 b. The shaft hole 42 a and the engagement hole 42 b are holes for mounting the main arm 42 to a drive member 61 described later. The shaft 320 of the base plate 30 is inserted into the shaft hole 42 a via the drive member 61, and the main arm 42 is rotatable around the shaft 320 together with the drive member 61.

  The secondary arm 43 is provided with an axial hole 43a. The shaft 324 of the base plate 30 is inserted into the shaft hole 43 a, and the sub arm 43 is rotatable about the shaft 324. In the case of the present embodiment, the spring 44 is a torsion coil spring through which the shaft 324 is inserted, and one end thereof is locked to the ground plate 30 and the other end is locked to the sub arm 43. The spring 44 biases the sub arm 43 in a direction to close the blade group 41. Thereby, rattling of the blade group 41 can be suppressed.

  The blade mechanism 50 has the same configuration as the blade mechanism 40. The base plate 30 is provided with a shaft 321 and a shaft 325, and the main arm 52 is provided with a shaft hole and an engagement hole (both not shown) corresponding to the shaft hole 42a and the engagement hole 42b of the main arm 42 The sub arm 53 is provided with a shaft hole (not shown) corresponding to the shaft hole 43 a of the sub arm 43. The spring 54 is also attached to the base plate 30 in the same mounting manner as the spring 44, and the spring 54 biases the sub arm 53 in the direction of opening the blade group 51.

<3. Drive mechanism>
The drive mechanism 60 will be described mainly with reference to FIGS. 4 and 10 to 13. FIG. 10 is an explanatory view of the drive mechanism 60, and is a cross-sectional view taken along the line II in FIG. FIG. 11 is a partially exploded perspective view of the drive mechanism 60. As shown in FIG. FIG. 12 is an exploded perspective view of the drive member 62 for the rear curtain viewed from two directions. FIG. 13 is a perspective view of the drive member 61 for the front curtain and an exploded perspective view thereof.

  The drive mechanism 60 includes a drive member 62, a drive spring 63B, a worm wheel 64B, a worm 65B, and a holding mechanism 66B as a mechanism for driving the blade mechanism 50.

  The drive member 62 includes a body member 620, an armature 622, a spring 623 and an armature shaft 624. The main body member 620 is, for example, a member made of synthetic resin. The driving member 62 such as the armature 622 is entirely housed in the range of the motor 81 in the Z direction (FIG. 18), and the thickness reduction of the shutter 2 in the Z direction is achieved.

  The body member 620 includes a tubular portion 620 a extending in the Z direction. The shaft 321 of the base plate 30 is inserted into the cylindrical portion 620 a, and the drive member 62 is rotatable around the shaft 321. The rotational position of the drive member 62 (main body member 620) is detected by the light sensor PI2 (see FIGS. 2 and 3). The light sensor PI2 is supported by the main plate 30 via a holder HD2 (see FIGS. 3 and 5).

  The end of the cylindrical portion 620a on the base plate 30 side is inserted through the shaft hole of the main arm 52 of the blade mechanism 50 (not shown; corresponds to the shaft hole 42a of the main arm 42 of the blade mechanism 40). The opposite end of the drive shaft passes through the drive spring 63B and the worm wheel 64B. The worm wheel 64B is rotatably supported by the cylindrical portion 620a.

  The body member 620 includes a pin base 620c projecting in the Z direction. A cylindrical pin cover 621 a made of metal is mounted on the pin base 620 c for the purpose of improving durability, and a driving pin 621 for a blade is formed. The drive pin 621 passes through the engagement hole of the main arm 520 of the wing mechanism 50 (not shown; corresponds to the engagement hole 42 b of the main arm 42 of the wing mechanism 40), and a guide groove formed in the ground plate 30. Move through in 326B (see FIG. 6). A buffer member 326b such as rubber is provided at the moving end of the drive pin 621 in the guide groove 326B to buffer an impact when the drive pin 621 abuts on the peripheral wall of the guide groove 326B.

  The main body member 620 includes an engaging portion 620b radially extending with respect to the cylindrical portion 620a. The engagement portion 620 b receives an input of an operating force from the charge slider 82 at the time of charge operation by the charge mechanism 80. By this operation force, the drive member 62 rotates clockwise around the shaft 321 as a rotation center. The body member 620 also includes an armature support 620d. An armature 622 is attached to the armature support 620 d by an armature shaft 624 via a spring 623. The armature 622 is releasably held by the holding mechanism 66B by the magnetic force of the holding mechanism 66B.

  The drive spring 63B is a torsion coil spring in the case of the present embodiment. The drive spring 63B is provided between the drive member 62 and the worm wheel 64B, and one end of the drive spring 63B is engaged with the drive member 62 and the other end is engaged with the worm wheel 64B to be connected to each other There is. The worm 65B is rotatably supported by the MG base plate 35. The worm 65B is supported by the MG base plate 35 with its axial direction inclined from the Z direction, and the shutter 2 can be thinner in the Z direction than in a configuration in which the axial direction of the worm 65B is the Z direction.

  The worm 65B meshes with the worm wheel 64B, whereby the rotational position of the worm wheel 64B is fixed. The charge operation rotates the drive member 62 from the initial position to the charge position about the shaft 321, but the worm wheel 64B is immobile due to the engagement with the worm 65B. Therefore, the drive spring 63B is wound up to store elastic energy for driving the blades. The charged drive spring 63B exerts a biasing force in the direction in which the blade group 51 is in the closed state. The biasing direction for the blade group 51 is opposite to that of the drive spring 63B and the spring 54, but the biasing force of the drive spring 63B is sufficiently stronger than the spring 54.

  When the worm 65B is rotated by a driver or the like, the phase of the rotational direction of the worm wheel 64B with respect to the shaft 321 changes. That is, the amount of elastic deformation of the drive spring 63B at the time of charge is adjusted, and the traveling speed (the curtain speed) of the blade group 51 can be adjusted.

  The holding mechanism 66B holds the drive member 62 in the charge position by the magnetic force. FIG. 4 shows the drive member 62 held at the charge position. The holding mechanism 66B is an electromagnet including a yoke 66a and a coil 66b wound around the yoke 66a, and the yoke 6a is supported by the MG base plate 35. By energizing and de-energizing the coil 66b, the adsorption and the adsorption release of the armature 622 are switched. Thereby, holding and release of the drive member 62 at the charge position can be switched, and the release causes the drive member 62 to rotate counterclockwise by the biasing force of the drive spring 63B as shown in the state ST2 of FIG. The blade group 51 travels to the closed state.

  Next, a mechanism for driving the blade mechanism 40 will be described. The drive mechanism 60 includes a drive member 61, a drive spring 63A, a worm wheel 64A, a worm 65A, and a holding mechanism 66A as a mechanism for driving the blade mechanism 40. The mechanism for driving the blade mechanism 40 is basically the same as the mechanism for driving the blade mechanism 50, but the structure of the drive member 61 is different. The configuration of the drive member 61 is also referred to FIGS. 30 and 31. FIGS. 30A and 30B are perspective views in which the viewpoint of the main body portion 610A of the drive member 61 is changed, and FIGS. 31A to 31C are drive members for causing the blade group 51 to travel to the closed state. It is the perspective view which changed the viewpoint of 61. FIG.

  The driving member 61 includes a main body member 610, an armature 612, a spring 613 and an armature shaft 614. The armature 612 is located substantially in the same position as the armature 622 in the Z direction, and the armature 612 and the like, the drive member 61 is entirely contained within the range of the motor 81 in the Z direction, as with the drive member 62 shown in FIG. The thickness of the shutter 2 is reduced in the Z direction.

  The main body member 610 has a two-member configuration in which two pivoting members of a main body portion 610A and an arm portion 610B coaxially rotatably supported are combined in the Z direction, and both are, for example, members made of synthetic resin. is there. The main body portion 610A includes a tubular portion 610a extending in the Z direction, and the arm portion 610B includes a tubular portion 610e coaxially with the tubular portion 610a. The shaft 320 of the base plate 30 extending in the Z direction is inserted into the cylindrical portions 610a and 610e, and the main body portion 610A and the arm portion 610B are independently rotatable around the shaft 320.

  The rotational position of the drive member 61 (main body 610A) is detected by the light sensor PI1 (see FIGS. 2 and 3). The light sensor PI1 is supported by the main plate 30 via a holder HD1 (see FIGS. 3 and 5).

  The cylindrical portion 610e is inserted through the shaft hole 42a of the main arm 42 of the blade mechanism 40, and the cylindrical portion 610a is inserted through the drive spring 63A and the worm wheel 64A. The worm wheel 64A is rotatably supported by the cylindrical portion 610a.

  The arm portion 610B includes a pin base 610c protruding in the Z direction. A cylindrical pin cover 611 a made of metal is attached to the pin base 610 c for the purpose of improving durability, and a driving pin 611 for a blade is formed. The drive pin 611 passes through the engagement hole 42 b of the main arm 42 of the blade mechanism 40 and moves in a guide groove 326 A (see FIG. 6) formed in the ground plate 30. The movement of the drive pin 611 opens and closes the blade set 41. A buffer member 326a such as rubber is provided at the moving end of the drive pin 611 in the guide groove 326A to buffer an impact when the drive pin 611 abuts on the peripheral wall of the guide groove 326A.

  The main body portion 610A includes an engaging portion 610b radially extending with respect to the cylindrical portion 610a. The engagement portion 610 b receives an input of an operating force from the charge slider 82 at the time of charge operation by the charge mechanism 80. By this operation force, the main body 610A rotates clockwise about the shaft 320 as a rotation center. The main portion 610A also includes an armature support portion 610d. An armature 612 is attached to the armature support portion 610 d by an armature shaft 614 via a spring 613. The armature 612 is releasably held on the holding mechanism 66A by the magnetic force of the holding mechanism 66A.

  The armature support portion 610 d is a member integrally including a vertical wall VW extending in the Z direction and a plurality of side walls SW extending in a comb shape from the side of the vertical wall VW, and the armature 612 is a vertical wall It is attached so as to be surrounded by these wall parts VW and SW facing VW.

  The vertical wall portion VW is a plate-like portion including the face S1 facing the armature 612 and the face S2 opposite thereto. The normal directions of the surfaces S1 and S2 are substantially orthogonal to the rotational direction d1 of the drive member 61 when the blade group 41 is caused to travel in the closed state by the biasing force of the drive spring 63A. An armature shaft 614 is inserted through a central portion of the vertical wall VW, and a spring 613 is disposed between the surface S 1 and the armature 612.

  An abutment portion 610i is formed on the surface S2. The abutment portion 610i abuts on the arm portion 610B as shown in FIG. 31 when the body portion 610A is rotated in the direction of arrow d1 by the biasing force of the drive spring 63A, and the arm portion 610B also moves in the direction of arrow d1 together with the body portion 610A. Rotate.

  The thickness of the shutter 2 in the Z direction may be increased due to the drive member 61 having a two-component configuration of the main body portion 610A and the arm portion 610B, but in the case of this embodiment, the abutment portion 610i is a vertical wall By being disposed within the range Zh in the Z direction of the portion VW, it is possible to make the shutter 2 thinner in the Z direction than in the configuration in which the abutting portion 610i is disposed outside the range Zh. Further, in the case of the present embodiment, the position in the Z direction of the engagement portion 610b is also within the range Zh, and it is possible to further reduce the thickness of the shutter 2 in the Z direction.

  In the case of the present embodiment, the contact portion 610i has a rectangular outer shape and is integrally formed with the vertical wall portion VW, and protrudes beyond the other portion of the surface S2. Therefore, the thickness of the vertical wall portion VW at the contact portion 610i is large. As a result, the rigidity necessary for transmitting the biasing force of the drive spring 63A to the arm portion 610B can be secured more reliably. Further, by projecting the contact portion 610i, accuracy management of the contact surface is facilitated. The contact portion 610i is disposed at an end portion of the vertical wall portion VW on the base plate 30 side in the Z direction. By arranging the contact portion 610i at a position closer to the ground plate 30, it is possible to further reduce the thickness of the shutter 2 in the Z direction.

  In the case of this embodiment, the drive spring 63A is a torsion coil spring. The drive spring 63A is provided between the main body portion 610A and the worm wheel 64A, and one end of the drive spring 63A is engaged with the main body portion 610A and the other end is engaged with the worm wheel 64A and connected to each other There is. The worm 65A is rotatably supported by the MG base plate 35. The worm 65A is supported by the MG base plate 35 with its axial direction inclined from the Z direction, and the shutter 2 can be thinner in the Z direction than in a configuration in which the axial direction of the worm 65A is the Z direction.

  The worm 65A meshes with the worm wheel 64A, whereby the rotational position of the worm wheel 64A is fixed. By the charge operation, the drive member 61 (main body 610A) rotates from the initial position to the charge position about the shaft 320, but the worm wheel 64A is immobile by meshing with the worm 65A. For this reason, the drive spring 63A is wound up to accumulate elastic energy for driving the blades. The charged drive spring 63A exerts a biasing force in the direction of opening so that the blade group 51 travels to expose the opening 31a. The biasing direction for the blade group 41 is opposite to that of the drive spring 63A and the spring 44, but the biasing force of the drive spring 63A is sufficiently stronger than the spring 44.

  The body portion 610A and the arm portion 610B are independently rotatable around the shaft 320, but the spring 44 biases the arm portion 610B clockwise via the sub arm 43. The arm portion 610B includes an abutted portion 610g that abuts on an abutting portion 610i formed on the armature support portion 610d of the main body portion 610A. The biased portion of the spring 44 presses the abutted portion 610g toward the armature support portion 610d, so that when the main portion 610A is rotated counterclockwise by the biasing force of the charged drive spring 63A, the arm portion 610B is also the main body. The blade group 41 travels in an open state by integrally rotating with the portion 610A.

  In the case of the present embodiment, the abutted portion 610g is formed at the root portion of the pin base 610c. Since load is applied to the pin base 610c, it is preferable that the root portion be a thick base. By using the base also as the abutted portion 610g, the rigidity of the pin base 610c can be improved. Can be made compact. The abutted portion 610g is integrally formed with an engaging portion 610h described later. By using a part of the engaging portion 610h as the abutted portion 610g, the rigidity of the pin base 610c can be further improved, and the parts can be made more compact.

  When the worm 65B is rotated by a driver or the like, the phase of the rotational direction of the worm wheel 64B with respect to the shaft 321 changes. That is, the amount of elastic deformation of the drive spring 63B at the time of charge is adjusted, and the traveling speed (the curtain speed) of the blade group 51 can be adjusted.

  The holding mechanism 66A holds the drive member 61 (the main body 610A) in the charge position by the magnetic force. State ST1 in FIG. 7 shows a state in which the drive member 61 is held at the charge position. The holding mechanism 66A is an electromagnet including a yoke 66a and a coil 66b wound around the yoke 66a, and the yoke 6a is supported by the MG base plate 35. The energization and de-energization of the coil 66b switches the adsorption and the adsorption release of the armature 612. Thereby, holding and release of the drive member 61 at the charge position can be switched, and the release causes the drive member 61 to rotate counterclockwise by the biasing force of the drive spring 63A as shown in the state ST2 of FIG. The blade group 41 travels to the open state.

<4. Locking mechanism and bound suppressing mechanism>
The locking mechanism 70 and the bound suppressing mechanism of the blade group 41 will be described. First, the locking mechanism 70 and the bound suppressing mechanism of the blade group 41 will be described mainly with reference to FIGS. 14 and 15. FIG. 14 is an exploded perspective view of the locking mechanism 70. As shown in FIG. FIG. 15 is a perspective view of the locking lever and the control lever as viewed from two directions.

  The locking mechanism 70 is a mechanism capable of maintaining the blade group 41 in the open state while maintaining the main body portion 610A in the charge position. As described above, in the present embodiment, the main body portion 610A and the arm portion 610B are independently rotatable around the shaft 320. When moving the drive member 61 to the charge position by the charge operation, the main portion 610A is moved to the charge position by locking the arm portion 610B by the locking mechanism 70, while the arm portion 610B is held at the initial position. The blade group 41 can be maintained in the open state and the opening 31a can be opened until just before the shutter is released. When the locking of the arm portion 610B by the locking mechanism 70 is released, the arm portion 610B is also rotated to the charge position by the biasing force of the spring 44, and the blade group 41 is closed.

  The locking mechanism 70 includes a base member 71, a cover member 72, an actuator 73, and a locking lever 74. The restraining lever 75 is engaged with the locking lever 74. The base member 71 is a member that supports the actuator 73, and the cover member 72 is a member that covers the actuator 73. The base member 71 is attached to the ground plate 30.

  The actuator 73 is a rotary solenoid type actuator in the present embodiment, and includes a rotor 730 and an electromagnet 731. The rotor 730 includes a cylindrical permanent magnet 730a and an arm member 730b attached to the permanent magnet 730a. A drive pin 730c is integrally provided at an end of the arm member 730b. The electromagnet 731 includes a yoke 731a and a coil 731b wound around the yoke 731a. The yoke 731a includes a C-shaped portion, into which the rotor 730 is inserted. The energization of the coil 731b rotates the rotor 730 about the axis in the Z direction. The turning direction of the rotor 730 can be switched by switching the energization direction of the coil 731b.

  The locking lever 74 includes a shaft hole 742 through which a shaft 323a (see FIG. 6) provided in the base plate 30 is inserted, and is rotatably supported by the shaft 323a. At one end of the locking lever 74, an engaging portion 740 that engages with the drive pin 730c of the rotor 730 is formed. In the case of this embodiment, the engagement portion 740 has a C-shape. At the other end of the locking lever 74, a locking portion 741 is formed. The locking portion 741 is a portion having an L-shaped cross section, and engages with the engaging portion 610f of the arm portion 610B of the drive member 61 to lock the arm portion 610B. In other words, the engaging portion 610 f and the locking portion 741 are engaged when the blade group 41 is in the open state. A pin-shaped connecting portion 743 is formed on the back side of the locking portion 741.

  The control lever 75 includes a shaft hole 751 through which a shaft 323b (see FIG. 6) provided in the base plate 30 is inserted, and is rotatably supported by the shaft 323b. At one end of the control lever 75, a connecting portion 750 that engages with the connecting portion 743 of the locking lever 74 is formed. In the case of this embodiment, the connecting portion 750 has a C-shape. A locking portion 752 is formed at the other end of the control lever 75. The locking portion 752 engages with the engaging portion 610 h of the arm portion 610 B of the drive member 61 to suppress the bounce of the arm portion 610 B, that is, the bounce of the blade group 41. In other words, the engaging portion 610 h and the locking portion 752 are engaged when the blade group 41 is in the closed state.

  The operation of the locking mechanism 70 and the suppression lever 75 will be described with reference to FIG. This figure is an operation explanatory view of the shutter 2. State ST31 shows the case where the rotor 730 is in the locking position, and state ST32 shows the case where the rotor 730 is in the release position. The energization of the coil 731b is ended when the rotor 730 is rotated to the locking position or the releasing position.

  When the rotor 730 is in the locking position, the locking portion 741 can be engaged with the engaging portion 610 f of the arm portion 610 B of the drive member 61. In the state ST31, the main body 610A is located at the charge position, but the arm 610B is locked at the initial position by the locking lever 74. For this reason, the blade group 41 is in the open state.

  When the rotor 730 is rotated from the locking position to the releasing position, the locking lever 74 rotates the shaft 323a counterclockwise to release the engagement between the locking portion 741 and the engaging portion 610f. By urging of the spring 44, the arm portion 610B is pivoted to the charge position, and the blade group 41 is closed.

  The control lever 75 pivots in the opposite direction to the locking lever 74. When the rotor 730 is in the release position, the locking portion 752 can be engaged with the engagement portion 610h of the arm portion 610B, as shown in the state ST32. This engagement suppresses the bounce of the blade group 41 in the direction from the closed state to the open state. That is, after the blade group 41 changes from the open state to the closed state by the biasing of the spring 44, bouncing to the open state side is suppressed. When the rotor 730 rotates from the release position to the locking position, the control lever 75 rotates the shaft 323b counterclockwise to release the engagement between the locking portion 752 and the engaging portion 610h. As a result, the blade set 41 can travel from the closed state to the open state by the biasing of the drive spring 63A.

<5. Charge mechanism>
The charge mechanism 80 will be described. First, the support structure of the motor 81 by the ground plate 30 will be described mainly with reference to FIGS. 16 to 18. 16 to 18 are explanatory views of a support structure of the motor, FIGS. 16 and 17 are exploded perspective views of the motor 81 and the ground plate 30, and FIG. 18 is a sectional view taken along line II-II of FIG.

  The mechanism support 32 of the ground plane 30 includes a motor support 328 that supports the motor 81. The motor support 328 includes a recess 328 a that receives the body 81 b of the motor 81 and an attachment 328 b that fixes the body 81 b. The mounting portion 328 b is formed so as to protrude in the Z direction on one end side of the recess 328 a in the Y direction. The mounting portion 328 b has a mounting hole 328 d for fixing an end of the body portion 81 b of the motor 81 and a hole 328 e through which the rotation shaft 81 a of the motor 81 is inserted. Further, the attaching portion 328b is provided with a pin-like engaging portion 328f which engages with a hole formed on the end face of the body 81b to restrict the rotation of the body 81b.

  The motor 81 is disposed on the recess 328 a and fixed to the mounting portion 328 b. Based on the surface 30a around the recess 328a of the opening forming portion 31 and the mechanism support portion 32 (see line L1 in FIG. 18), the motor 81 is supported in a manner embedded in the ground plate 30 in the Z direction. There is. As the embedding degree, in the case of the present embodiment, when viewed in the arrangement direction (X direction) of the opening 31a and the motor 81, the body 81b and the opening 31a overlap. Referring to FIG. 18, it is understood that the position of the opening 31a is between the line L1 and the line L2 and overlaps with the body 81b. By such an arrangement, even when a high-output motor having a large size is adopted as the motor 81, the thickness of the shutter 2 in the Z direction can be thinner, and the shutter 2 can be miniaturized. When the weight of the motor 81 is heavy, the motor 81 may fall off from the motor support 328 when the imaging device 10 is dropped by mistake etc. It can prevent falling off.

  The thickness of the recess 328a is constant, and is recessed from the periphery on the surface 30a side of the recess 328a base plate 30, while on the surface 30b on the opposite side, the surface 30b around the recess 328a of the opening forming portion 31 and the mechanism support portion 32. (See the line L2 in FIG. 18), it bulges convexly from its periphery. The weight increase can be suppressed by making the thickness of the ground plate 30 substantially constant regardless of the part. For example, by providing the cover plate 36 in the range of the Z direction in which the recess 328 a protrudes, it is possible to reduce the wasted space.

  The recess 328 a extends in the Y direction, and the cross-sectional shape in the X direction has an arc shape that matches the body 81 b of the motor 81 having a cylindrical shape. The recessed portion 328 a has a curved shell shape, so that weight reduction and rigidity improvement of the motor support portion 328 can be achieved. In addition, since the recess 328a has a shape along the outer shape of the body 81b, it is possible to reduce the gap which is a wasteful space and to enhance the function as the falling prevention wall of the motor 81. The circumferential surface of the body 81b may be in contact with or slightly separated from the bottom surface of the recess 328a, but in either case, the slit 328c penetrating the bottom wall of the recess 328a is formed in this embodiment, The heat dissipation of the motor 81 can be improved.

  As shown in FIG. 16, a motor terminal 81 d is provided on the other end side of the motor 81 in the Y direction. The motor terminal 81d may be rotated and fixed with a variation of about 20 degrees around the output shaft because the motor terminal 81d is crimped while adjusting the phase of the motor terminal 81d and the motor 81 when the motor 81 is manufactured. . On the other hand, when the motor 81 is mounted, if the terminal of the motor 81 is oriented in the positive direction of the Z axis, the workability can be improved. Therefore, in the present embodiment, the motor terminal member 81e is attached so as to be in contact with the motor terminal 81d and to face the positive direction side of the Z axis.

  That is, the motor terminal member 81e is attached to the other end of the motor 81 so that the electrode portion 81g provided along the curved surface formed on the side face contacts the motor terminal 81d, and the terminal 81f is Z It is provided to face in the axial positive direction. The electrode portion 81g has a predetermined length along the circumferential direction of the body portion 81b of the motor 81. Therefore, even if there is a variation in the motor terminal 81d described above, the electrode portion 81g can be reliably contacted. The terminal 81 f can be easily fixed so as to face in the positive Z-axis direction.

  The motor terminal member 81 e is positioned by fitting a hole formed at the center thereof to a convex portion provided on the other end side of the motor 81. In addition, a flat portion is provided at the end of the motor terminal member 81e on the Z-axis negative direction side, and is flat for positioning provided on a fixing jig for fixing the motor terminal member 81e to the motor 81. By contacting the surface, the mounting angle of the motor terminal member 81 e with respect to the motor 81 can be adjusted to an appropriate position.

  In the present embodiment, the motor support portion 328 is integrally provided on the base plate 30. However, the motor support portion 328 may be a member different from the base plate 30, and, for example, the motor support portion 328 on the imaging device 10 side. And the structure provided with the motor 81 is also employable.

  Next, a mechanism related to the operation of the blade groups 41 and 51, such as a mechanism of the drive mechanism 60 and a mechanism other than the motor 81 of the charge mechanism 80, is disposed between the opening 31a and the motor 81. The mechanism related to the operation of the blade groups 41 and 51 and the body 81 b are densely arranged in the X direction, and the downsizing of the shutter 2 in the X direction is achieved. For example, although the line L3 in FIGS. 18 and 21 indicates the position of the end point of the body 81b in the X direction, it is understood that the line L3 overlaps the charge slider 82. That is, the body 81 b overlaps the charge slider 82 when viewed in the Z direction. In the present embodiment, the portion on the side of the shaft 84 of the charge slider 82 overlaps the body 81b when viewed in the Z direction, and the portion on the side of the shaft 83 of the charge slider 82 is substantially in contact with the line L3. The portion on the side of the shaft 83 may also overlap with the body 81 b as viewed in the Z direction.

  The MG base plate 35 also functions as a cover member that covers the gap between the body 81 b and the mechanism involved in the operation of the blade groups 41 and 51. In FIG. 18, the end of the MG base plate 35 projects further to the trunk 81b side than the line L3, and covers the gap between the trunk 81b and the upper portion of the charge slider 82. This makes it possible to prevent dust from entering the mechanism through the gap. As indicated by a line L4, the cover member 35 is disposed at a height (distance in the Z direction) from the main plate 30 lower than that of the body 81b. By projecting to the outer peripheral surface of the body 81b at a position deviated from the end point of the body 81b in the X direction indicated by a line L3, downsizing in the X direction can be achieved. The area on the MG ground plate 35 can be utilized as an arrangement area of the flexible substrate 38. That is, various mechanisms, the flexible substrate 38 and the like can be accommodated within the width of the body 81b in the Z direction, and the shutter 2 can be miniaturized in the Z direction. The flexible substrate 38 can include wiring for sensors included in the shutter 2 and wiring for coil energization. In particular, by providing an electrical component such as a capacitor disposed on the flexible substrate 38 on the Z-axis positive direction side of the flexible substrate 38 and avoiding the electrical component disposed on the flexible substrate 38 and providing a cover member 37 described later. The cover member 37 can be provided while suppressing the thickness in the Z direction.

  An L-shaped cover member 37 is provided on the side of the opening 31 a of the MG base plate 35. The cover member 37 can suppress the entry of dust into the drive mechanism 60 in the Z direction and the X direction.

  The configuration of the charge mechanism 80 other than the motor 81 will be described mainly with reference to FIGS. 4 and 19 to 24. 19 is an explanatory view of a charge slider guide mechanism, FIG. 20 is a perspective view of a charge slider 82, FIGS. 21, 22 and 24 are structural explanatory views of a charge mechanism 80, and FIG. FIG. FIG. 23 is an explanatory view of the gear train 85. As shown in FIG.

  The charge mechanism 80 is a mechanism that uses the motor 81 as a drive source to charge the drive mechanism 60 with the drive springs 63A and 63B. The charge mechanism 80 includes a charge slider 82 for operating the drive mechanism 60, guide shafts 83 and 84 for guiding the movement of the charge slider 82, a gear train 85 for transmitting the driving force of the motor 81 to the charge slider 82, and the charge slider 82. Are biased to the initial position.

  The guide shafts 83 and 84 both extend in the Y direction and are spaced apart from each other in the Z direction. The ground plate 30 includes a pair of support portions 329 that support both ends of the guide shafts 83 and 84. The support portion 329 is a columnar member erected in the Z direction, and is provided with a hole into which each end of the guide shafts 83 and 84 is fitted. The charge slider 82 includes a pair of insertion portions (here, holes) 820a through which the guide shaft 83 is inserted and a pair of insertion portions (here, notches) 820b through which the guide shaft 84 is inserted. The hole 820a is a circular closed hole, and the notch 820b is a U-shaped notch. The linear movement of the charge slider 82 in the Y direction is guided by the guide shaft 83 being inserted through the pair of holes 820a. The guide shaft 84 is inserted into the pair of notches 820b, whereby the swinging movement of the charge slider 82 about the guide shaft 83 is restricted (rotation stop). The pair of notches 820b may also be closed holes like the holes 820a, but with the notches, the assemblability of the charge slider 82 and the miniaturization of parts can be achieved.

  Further, by arranging the pair of holes 820a and the pair of notches 820b apart in the Y direction, the charge slider 82 can be made smaller and friction can be reduced at the time of sliding, as compared with a configuration where continuous holes or notches are provided. Can be Further, the pair of the holes 820a and the guide shaft 83, and the pair of the notches 820b and the guide shaft 84 are separated in the Z direction, so that the shutter is more than the configuration in which they are separated in the X direction. 2 can be miniaturized in the X direction.

  The charge slider 82 includes a main body portion 820, engaging portions 821 and 822, and operating portions 823 and 824. The main body portion 820 is integrally formed of, for example, a synthetic resin, and includes a portion forming the hole 820 a and the notch 820 b described above. As shown in FIG. 21, the main body 820 is disposed adjacent to the body 81b of the motor 81, and has a recess 82a recessed in the X direction so as to avoid the body 81b. The recess 82a is formed by the portion forming the hole 820a and the notch 820b being inclined toward the body 81b. In the case of this embodiment, the central portion in the Z direction of the main body portion 820 and the central portion in the Z direction of the trunk portion 81 b are at substantially the same height when viewed from the surface 30 a of the main plate 30. Therefore, in the main body portion 820, the central portion in the Z direction is closer to the opening 31a in the X direction, and both end portions (that is, portions forming the hole 820a and the notch 820b) are closer to the motor 81 in the X direction. The charge slider 82 is disposed close to the motor 81 so as not to interfere with it. As shown in FIG. 21, the side shape of the charge slider 82 on the motor 81 side is a curved surface shape (arc surface shape) generally along an imaginary circle C1 coaxial with the body 81b. By such an arrangement, downsizing of the shutter 2 in the X direction can be achieved. In the present embodiment, the position of the guide shafts 83 and 84 is on the side of the opening 31a relative to the line L3, but it is also possible to partially position at least one of the guide shafts 83 and 84 on the motor 81 side relative to the line L3. is there. Thereby, size reduction of the X direction of the shutter 2 can further be achieved.

  The charge slider 82 is located within the range of the width (diameter) W1 of the body 81b of the motor 81 in the Z direction. The thickness in the Z direction of the shutter 2 can be substantially reduced to the diameter of the motor 81, and the thickness of the shutter 2 can be reduced.

  A coil spring 86 is provided between the base plate 30 and the main body portion 820, and biases the charge slider 82 to the initial position. The guide shaft 83 has a coil spring 86 inserted therethrough, and also functions as a support shaft for the coil spring 86. By guiding the movement of the charge slider 82 and supporting the coil spring 86 by the guide shaft 83, the number of parts can be reduced.

  The engaging portions 821 and 822 are input portions to which the driving force of the motor 81 is input from the gear train 85. In the case of the present embodiment, the metallic portions are supported by the main body 820 so as to be rotatable about an axis in the Z direction. It is Koro. The operation parts 823 and 824 are parts that operate the drive mechanism 60, and in the case of this embodiment, are metal rollers supported by the main body 820 so as to be rotatable about an axis in the Z direction. The engaging portions 821 and 822 and the operating portions 823 and 824 are portions for transmitting the driving force of the motor 82, and by making them metal, durability of the mechanism can be improved.

  The operation portions 823 and 824 are disposed on the main plate 820 side of the main body portion 820, and the engaging portions 821 and 822 are disposed on the opposite side of the main plate portion 820 to the main plate 30. By arranging the drive force input part (821, 822) and the output part (823, 824) in the Z direction, the related mechanism can be distributed in the Z direction, and as a whole, the Z of the shutter 2 is Thinning of the direction can be achieved.

  In the case of this embodiment, two engaging portions 821 and 822 are provided, but may be one or three or more. The operation units 823 and 824 are arranged to be shifted in the Y direction. The operation unit 823 corresponds to the drive member 61, and the operation unit 824 corresponds to the drive member 62.

  In FIG. 24, as indicated by lines L5 and L6, the two notches 820b and the operation parts 823 and 824 are disposed at overlapping positions in the Z direction. The reaction force received by the operation units 823 and 824 from the drive mechanism 60 can be easily loaded by the guide shaft 84 through the notches 820 b, and the charge slider 82 can be prevented from swinging around the guide shaft 83 or the charge slider 82 can be Deformation due to such stress can be suppressed.

  Gear train 85 includes gears 850-853. The ground plate 30 includes Z-direction axes 327a to 327c and 322 that rotatably support them (see FIG. 6 and the like). The gear 850 includes a worm wheel 850a and a flat gear 850b on a shaft 327a, and these rotate together. The worm wheel 850 a meshes with a pinion gear 81 c attached to the output shaft 81 a of the motor 81. Here, by converting the rotational axis direction of the driving force transmission system from the X direction to the Z direction, the thickness in the Z direction of the shutter 2 can be thinned even if the diameters of the gears 850 to 853 are large.

  The gear 851 includes flat gears 851a and 851b on a shaft 327b, which rotate together. The flat gear 851 a meshes with the flat gear 850 b, and the flat gear 851 b meshes with the gear 852. By arranging the flat gear 851a on one side (lower side in FIG. 24) and the flat gear 851b on the other side (upper side in FIG. 24) with respect to the output shaft 81a in the Z direction, These gears can be disposed within the range, and downsizing (thinning) of the shutter 2 in the Z direction can be achieved.

  The gear 852 is a flat gear provided on the shaft 327 c and meshes with the gear 853. The gear 853 is a flat gear provided on the shaft 322. In the case of the present embodiment, the reduction ratio of the gear 852 and the gear 853 is one. A rotation cam member 854 is provided on the shaft 322, and the gear 853 and the rotation cam member 854 rotate integrally. A detected member 852a is also provided on the shaft 327c. The detected member 852 a rotates integrally with the gear 852. The rotational position of the detection target member 852a is detected by the light sensor PI3 (only its arrangement is shown in FIG. 2. It is arranged on the back of the unit in the same drawing). The rotational position of the rotational cam member 854 is detected by detecting the rotational position of the detection target member 852a. In the case of the present embodiment, since the reduction ratio of the gear 852 and the gear 853 is 1, the detection result of the rotational position of the detected member 852a is used as the rotational position of the rotating cam member 854 without being converted by the reduction ratio. be able to.

  It is also possible to provide a sensor that directly detects the rotational position of the rotating cam member 854. However, in the present embodiment, due to the layout of the mechanism, it is difficult to secure a sensor disposition space around the rotating cam member 854. Therefore, the rotational position of the rotating cam member 854 is detected via the detection target member 852a that rotates in synchronization with the rotating cam member 854.

  The position in the Z direction of the detection target member 852 a is within the range of the thickness in the Z direction of the body 81 b of the motor 81. This contributes to the downsizing of the shutter 2 in the Z direction.

  The rotating cam member 854 is a plate cam that inputs the driving force of the motor 81 to the charge slider 82. The rotating cam member 854 includes an abutting portion 854 a abutting on the engaging portion 821 and an abutting portion 854 b abutting on the engaging portion 822. In the case of the present embodiment, the main body portion 820 is configured in a step shape in which the engaging portions 821 and 822 are disposed, and the engaging portions 821 and 822 are offset in the Y direction and the Z direction. The contact portions 854 a and 854 b are disposed apart in the circumferential direction and the Z direction of the shaft 322 in the rotating cam member 854. In this embodiment, the contact between the engaging portion 821 and the contact portion 854a and the contact between the engaging portion 822 and the contact portion 854b are caused by setting a time difference (a phase difference of the rotating cam member 854). The charge slider 82 is linearly moved in the Y direction by the stage pressure. Thus, the movement stroke of the charge slider 82 can be made larger with a compact configuration. FIG. 25 is an operation explanatory view of the charge mechanism 80, and is an operation explanatory view showing the movement operation of the charge slider 82 by the rotation of the rotation cam member 854.

  The driving force of the motor 81 is transmitted by the gear train 85 to rotate the rotating cam member 854 clockwise. The state ST11 indicates a stage where the contact portion 854a starts to contact the engagement portion 821. In the stage of the state ST11, the contact portion 854b is not in contact with the engagement portion 822. State ST12 shows a state in which the rotation of the rotation cam member 854 has progressed. The contact portion 854a presses the engaging portion 821 in the Y direction, whereby the charge slider 82 moves in the Y direction. Also, the contact portion 854 b starts to engage with the engagement portion 822. State ST13 shows a state in which the rotation of the rotation cam member 854 has further advanced. Although the contact between the contact portion 854a and the engagement portion 821 is eliminated, the movement of the charge slider 82 in the Y direction continues by the contact portion 854b pressing the engagement portion 822 in the Y direction. Thus, the movement stroke of the charge slider 82 can be made large.

  FIG. 26 is a diagram for explaining the operation of the charge mechanism 80, and shows an example of the charge operation of the drive mechanism 60 by the charge mechanism 80. State ST21 shows a stage where the contact portion 854a starts to contact the engagement portion 821. In the stage of the state ST11, the contact portion 854b is not in contact with the engagement portion 822. The drive members 61 and 62 of the drive mechanism 60 are both located at the initial position.

  State ST22 shows a state in which the rotation of the rotation cam member 854 has progressed. The contact portion 854a presses the engaging portion 821 in the Y direction, whereby the charge slider 82 moves in the Y direction. Also, the contact portion 854 b starts to engage with the engagement portion 822. By the movement of the charge slider 82, the operation units 823 and 824 operate the drive mechanism 60. Specifically, the operation portion 823 abuts on the engagement portion 610 b of the drive member 61 and presses in the Y direction. Thereby, the drive member 61 rotates clockwise. Further, the operation portion 824 abuts on the engagement portion 620 b of the drive member 62 and presses in the Y direction. Thus, the drive member 62 pivots clockwise. In the example of FIG. 26, the locking of the arm portion 610B by the locking mechanism 70 is not performed, and the main portion 610A and the arm portion 610B of the drive member 61 are integrally rotated.

  State ST23 shows a state in which the rotation of the rotation cam member 854 has further advanced. Although the contact between the contact portion 854a and the engagement portion 821 is eliminated, the movement of the charge slider 82 in the Y direction continues by the contact portion 854b pressing the engagement portion 822 in the Y direction. Thereby, the operation parts 823 and 824 rotate the drive members 61 and 62, and the drive members 61 and 62 reach the charge position. By driving the holding mechanisms 66A, 66B, the drive members 61, 62 are held at the charge position. When the rotation of the rotation cam member 854 further progresses, the contact between the contact portion 854 b and the engagement portion 822 is eventually eliminated, and the charge slider 82 is returned to the initial position by the biasing of the coil spring 86. In the present embodiment, the reciprocating movement range of the charge slider 82 is within the total length YM in the axial direction of the motor 81. Thereby, downsizing of the shutter 2 in the Y direction can be achieved.

  Here, with reference to FIG. 24, the positional relationship between the contact parts 854a and 854b and the operation parts 823 and 824 will be described. As indicated by a line L7, the operation portions 823 and 824 are disposed at positions overlapping the contact portion 854b in the Y direction. Since the operation parts 823 and 824 receiving the reaction force from the drive mechanism 60 are located on the direction line (line L7) of the force input from the abutting part 854b to the charge slider 82, the X direction generated in the main body part 810 The moment about the axis of the lens can be further reduced, the durability of the main body 810 can be improved, or the strength required of the main body 810 can be reduced. The operation portions 823 and 824 may be disposed at positions overlapping the contact portion 854a in the Y direction, but the load on the rotating cam member 854 and the charge slider 82 is increased in the second half of the charge operation by winding up the drive springs 63A and 63B. . Therefore, the arrangement in which the contact portion 854 b for transmitting the driving force in the second half of the charge operation and the operation portions 823 and 824 overlap in the Y direction is more advantageous. Further, according to this configuration, the operating portion 824 is formed in the space formed in the negative Z-axis direction of the engaging portion 821 by arranging the engaging portion 821 and the engaging portion 822 separately in the Y direction and the Z direction. The notch 820b provided in the upper part of the operation unit 824 can be brought closer to one end side with respect to the Y direction in the charge slider 82, and the strain on the charge slider 82 applied when the drive mechanism 60 is pressed is reduced. can do.

<6. Overall operation example>
An operation example of the entire shutter 2 will be described with reference to FIGS. 27 to 29 are explanatory diagrams of the operation of the shutter 2, and mainly show an example of the single shooting operation of the imaging device 10.

  State ST31 in FIG. 27 shows the stage in which the shutter 2 is in the standby state. Although the shutter 2 can selectively select normally open and normally closed as the standby state, the case where normally open is selected is illustrated here. Both the blade groups 41 and 51 are in the open state, and the opening 31a is open. The rotor 730 of the locking mechanism 70 is at the locking position, and the arm portion 610B is locked at the initial position by the locking lever 74. The drive members 61 and 62 are held at the charge position.

  When the shutter operation is detected, the locking mechanism 70 is driven to rotate the rotor 730 to the release position. As a result, the engagement between the arm portion 610B and the locking lever 74 is released, and the biasing of the spring 44 causes the blade group 41 to once travel in the closed state as shown in the state ST32. The restraining lever 75 is engaged with the arm portion 610B to suppress the bouncing of the blade group 41.

  Subsequently, as shown in a state ST33 of FIG. 28, the locking mechanism 70 is driven to return the rotor 730 to the locking position. Further, the rotation cam member 854 is rotated by the drive of the motor 81 and the contact between the contact portion 854 b and the engagement portion 822 is cancelled, and the charge slider 82 returns to the initial position by the biasing of the coil spring 86. The suppression lever 75 has an inclined surface so that the engagement is not released even if the arm portion 610B is urged by rotation, whereby the tip end of the arm portion 610B intrudes into the rotation locus of the suppression lever 75. It is in a state of Therefore, as shown also in the state ST33 of FIG. 28, when the rotor 730 is rotated and returned to the locking position, the arm portion 610B is pressed to the holding mechanism 66A side by the suppression lever 75. 41 has moved to the overcharge position once.

  Subsequently, as shown in the state ST34, the holding of the drive member 61 by the holding mechanism 66A is released, the drive member 61 is rotated counterclockwise by the urging of the drive spring 63A, and the blade group 41 travels to the open state. . The opening 31a is opened, and the imaging device 3 is exposed. In the locking position, the tip end of the locking lever 74 intrudes into the traveling track of the arm portion 610B. Therefore, in the process of the drive member 61 rotating counterclockwise, engagement of the arm portion 610B is performed. The engagement portion 610 f passes to the left of the engagement portion 741 so as to push up the engagement portion 741 of the locking lever 74, and the engagement portion 610 f and the engagement portion 741 engage again, and the wing group 41 bounces. Be suppressed. The locking lever 74 has a curved surface on the side of the opening 31a in a portion where the engaging portion 741 is formed, and makes the pushing by the engaging portion 610f smooth.

  At the timing according to the set shutter speed, the holding of the drive member 62 by the holding mechanism 66B is released, and the drive member 62 is turned counterclockwise by the urging of the drive spring 63B, and the state ST35 of FIG. As shown, the blade group 51 travels to the closed state. Thereby, the opening 31a is closed, and the exposure of the imaging device 3 is completed.

  Subsequently, the charge operation is performed. The rotation cam member 854 is rotated by the drive of the motor 81 to move the charge slider 82, and the drive springs 63A and 63B are charged respectively. At this time, the blade group 41 is maintained in the open state by the engagement of the arm portion 610B and the locking lever 74, and the state of the state ST36 is reached. This is the same state as the state ST31 of FIG. Thus, one shutter operation is completed.

DESCRIPTION OF SYMBOLS 2 shutter, 10 imaging device, 30 base plate, 31a opening, 41 blade group, 51 blade group, 60 drive mechanism, 70 locking mechanism, 80 charge mechanism, 612 armature, VW vertical wall portion, 610i contact portion

Claims (9)

A base plate forming an opening through which light passes;
A blade for opening and closing the opening;
A driving spring which exerts a biasing force for causing the blade to travel to expose the opening;
A first pivoting member rotatably supported about an axis in the optical axis direction and coupled to the drive spring;
A second pivoting member rotatably supported coaxially with the first pivoting member for opening and closing the blades;
A charge mechanism for rotating the first rotation member to a charge position to charge the drive spring;
A holding mechanism for holding the first rotating member at the charge position by magnetic force;
A locking mechanism capable of locking the second rotation member to maintain the blade in the open state;
A blade drive comprising:
The first pivoting member includes a support that supports an armature held magnetically by the holding mechanism,
The support portion has a wall portion extending in the optical axis direction and facing the armature.
When the first pivoting member is pivoted by the biasing force of the drive spring, the first pivoting member abuts against the second pivoting member at a portion of the wall opposite to the armature. An abutment portion is formed to rotate the second rotation member as well as the member.
Blade driving device characterized in that. The blade driving device according to claim 1, wherein
The contact portion is formed at an end portion on the base plate side in the opposite portion of the wall portion.
Blade driving device characterized in that. The blade driving device according to claim 1 or 2, wherein
The abutments project more than their surroundings,
Blade driving device characterized in that. The blade driving device according to any one of claims 1 to 3, wherein
The first rotation member includes an engagement portion engaged with the charge mechanism and receiving a pressing force for rotating the first rotation member from the charge mechanism to the charge position.
The position of the engaging portion in the optical axis direction is within the range of the optical axis direction of the wall portion.
Blade driving device characterized in that. The blade driving device according to any one of claims 1 to 4, wherein
The second pivoting member includes a drive pin that opens and closes the blade.
The contact portion contacts a root portion of the drive pin of the second rotation member.
Blade driving device characterized in that. The blade driving device according to claim 5, wherein
The second rotating member is
A first engagement portion engaged with the locking mechanism when the blade is in the open state;
A second engagement portion engaged with the locking mechanism when the blade is in a closed state;
The second engagement portion is formed at the root portion of the drive pin,
Blade driving device characterized in that. The blade driving device according to claim 4, wherein
The charge mechanism is
A charge slider which moves on the base plate by a driving force of a driving source,
The charge slider is
Body part,
An operation unit disposed on the side of the base plate of the main body and engaged with the engagement portion;
Blade driving device characterized in that. The blade driving device according to any one of claims 1 to 7, wherein
The charge mechanism includes a motor as its drive source,
The armature is located within the range of the body of the motor in the optical axis direction.
Blade driving device characterized in that.   An imaging device equipped with the blade driving device according to any one of claims 1 to 8.