JP7252802B2 - Blade driving device and imaging device - Google Patents

Description

The present invention relates to a blade driving device used to provide a shutter function and a filter switching function in an imaging device such as a camera or a video camera, and an imaging device equipped with the blade driving device. The present invention relates to a blade driving device capable of preventing the state of the blade driving device from being switched by an external force caused by vibration or the like, and an imaging apparatus equipped with the blade driving device.

Conventionally, in imaging devices such as cameras and video cameras, in order to provide a shutter function and a filter switching function, a blade for changing the position of a blade member with respect to an opening for exposing an imaging element provided inside the imaging device. A drive is used. The blade member includes a shutter member for blocking light or a filter such as an infrared filter or an ND filter. The blade driving device is configured to be capable of driving the blade member in at least two directions. Or it can switch to the state where the filter is not positioned. Such a vane drive provides a shutter function or a filter switching function.

As such a blade driving device, Patent Document 1 discloses a blade driving device that utilizes the magnetic force between a cylindrical magnet and a yoke provided to face the peripheral surface of the cylindrical magnet. . In the blade driving device disclosed in Patent Document 1, the rotation and holding of the cylindrical magnet is controlled by the magnetic force between the cylindrical magnet and the yoke. The position of the blade members can be changed.

In the blade driving device having such a configuration, there is a problem that an external force is applied to the blade driving device due to factors such as dropping or vibration, causing the cylindrical magnet to rotate unintentionally and switching the state of the blade driving device. rice field.

Japanese Patent Application Laid-Open No. 2003-348398

The present invention has been made in view of the problems of the prior art, and provides a blade driving device and a blade driving device capable of preventing state switching when an external force caused by dropping, vibration, or the like is applied. It is an object of the present invention to provide an imaging device comprising a device.

According to the first aspect of the present invention, there is provided a blade driving device capable of preventing state switching when an external force caused by dropping, vibration, or the like is applied. The blade driving device includes a base having an opening, a blade member driven to change the position of the base with respect to the opening, and an operation driving section for driving the blade member on the base. . The operation drive section includes an arm section configured to be rotatable about a predetermined axis, and a drive pin provided at the tip of the arm section. The vane member includes a cam hole for inserting the drive pin of the operation drive portion, and an engaging protrusion formed to protrude from the inside of the cam hole. When the drive pin of the operation drive portion pushes the end surface of the cam hole of the blade member to drive the blade member, the engagement protrusion of the blade member is connected to the drive pin of the operation drive portion. Further, when the end face of the cam hole of the blade member pushes the drive pin of the operation drive portion, the blade member engages with the drive pin of the operation drive portion to drive the blade member. designed to regulate.

As a result, when the driving pin of the operation driving portion pushes the end surface of the cam hole of the blade member to drive the blade member, the engaging protrusion of the blade member does not contact the driving pin of the operation driving portion, and the blade member is driven. does not regulate the driving of On the other hand, when the blade member moves due to a factor other than the drive of the operation drive unit, such as dropping or vibration of the blade drive device, and the end surface of the cam hole of the blade member pushes the drive pin of the operation drive unit, the blade member is not engaged. The mating protrusion engages with the driving pin of the operation driving section to restrict the driving of the blade member. Therefore, it is possible to restrict the driving of the blade members when an external force caused by dropping or vibration of the blade driving device is applied to the blade members without restricting the driving of the blade members by the operation driving unit.

Further, when the arm portion of the operation driving portion starts to rotate due to the driving of the operation driving portion, the engaging protrusion of the blade member moves along the rotation trajectory of the driving pin of the operation driving portion. Further, when the end surface of the cam hole of the blade member pushes the drive pin of the operation drive section, the drive pin of the operation drive section is positioned within the rotation locus. It is preferably configured to

As a result, only when the blade member moves due to a factor other than the drive of the operation drive unit, such as dropping or vibration of the blade drive device, the engagement protrusion of the blade member engages with the drive pin of the operation drive unit, and the drive pin moves. can be prevented from unintentionally rotating and driving the blade member.

Further, the operation driving portion includes a cylindrical magnet provided integrally with the base end portion of the arm portion and rotatable about the predetermined axis, a pair of extension portions, and the pair of extension portions. It may have an arc portion formed in each of the portions and a connecting portion connecting the pair of extending portions. Further, the operation driving portion includes a yoke arranged such that the arc portions of the pair of extension portions face the peripheral surface of the cylindrical magnet, and one of the pair of extension portions of the yoke. It may further include a coil provided to. The operation drive unit is in a steady state in which the cylindrical magnet does not freely rotate due to the magnetic force between the cylindrical magnet and the arc portion of the yoke in a non-energized state in which no current is supplied to the coil. is preferably configured to be able to implement

Thus, the operation driving section can achieve a steady state in which the cylindrical magnet does not freely rotate in a non-energized state in which no current is supplied to the coil. The blade driving device can utilize such a steady state to hold the blade member in a non-energized state in which current is not supplied to the coil.

Further, when the end surface of the cam hole of the blade member pushes the drive pin of the operation drive section, the state of the operation drive section may change from the steady state. The operation driving portion engages the engaging protrusion of the blade member with the driving pin of the operation driving portion, restricts the driving of the blade member, and then rotates the circular arc of the cylindrical magnet and the yoke. It is preferable to be configured to return to the steady state by the magnetic force between the portion.

As a result, it is possible to prevent unintended driving of the blade members when an external force is applied to the blade members due to falling or vibration of the blade driving device, and the application of the external force to the blade members is canceled. Afterwards, the operating drive can return to steady state. Therefore, a special mechanism for releasing the engagement between the engaging protrusion of the blade member and the driving pin of the operation driving portion is not required.

Also, the vane member may include a filter for covering the opening of the base. The operation drive unit has a first state in which the filter of the blade member is not positioned over the opening of the base, and a second state in which the filter of the blade member is positioned over the opening of the base. It is preferable that the vane member is driven on the base in order to switch between and.

Thus, by driving the blade member on the base, it is possible to arbitrarily switch between a first state in which the filter is not positioned over the opening of the base and a second state in which the filter is positioned over the opening of the base. becomes possible.

Further, in the first state, the engaging protrusions of the blade members are configured to engage the operation drive portion when the end surface of the cam hole of the blade member pushes the drive pin of the operation drive portion. a first engagement protrusion that engages with the drive pin; and the operation drive when the end face of the cam hole of the blade member pushes the drive pin of the operation drive portion in the second state. and a second engaging projection for engaging said drive pin of the part.

As a result, even when the blade driving device is in either the first state or the second state, the blade member may be damaged by a factor other than driving of the operation driving section, such as dropping or vibration of the blade driving device. Unintentional driving can be prevented.

Moreover, the blade member may further include a transparent glass plate arranged side by side with the filter in a uniaxial direction. The operation drive unit is configured to: It is preferable that the blade member is slidable on the base in order to switch between the second state of being positioned over the opening of the .

Thus, by sliding the blade member using the blade driving device, a first state in which the transparent glass plate is positioned over the opening of the base and a second state in which the filter is positioned over the opening of the base can be achieved. can be switched.

Moreover, it is preferable that the operation driving section is configured to rotate the blade member on the base in order to switch between the first state and the second state.

Accordingly, the first state and the second state can be switched by rotating the blade member using the blade driving device.

According to a second aspect of the present invention, there is provided an imaging device comprising the vane driving device described above.

As a result, when an external force caused by dropping or vibration of the imaging device is applied to the blade member of the blade driving device, the driving of the blade member is driven and the state of the blade driving device is prevented from being unintentionally switched. can do.

According to the present invention, it is possible to prevent unintended switching of the state of the blade driving device even if an external force caused by dropping or vibration of the blade driving device is applied to the blade members.

1 is a perspective view of a blade driving device according to a first embodiment of the present invention; FIG. 2 is an exploded perspective view of the blade driving device shown in FIG. 1. FIG. 3 is a plan view of a blade member of the blade driving device shown in FIG. 1. FIG. 4A and 4B are diagrams for explaining the configuration and operation of the operation driving section of the blade driving device shown in FIG. 1. FIG. 5 is a schematic diagram for explaining a first state of the blade driving device shown in FIG. 1. FIG. FIG. 6 is a partially enlarged view of FIG. FIG. 7 is a schematic diagram for explaining the operation of the blade driving device until the blade driving device switches from the first state shown in FIG. 5 to the second state. FIG. 8 shows that when the blade drive device is in the first state shown in FIG. 5, the blade member is driven by a factor other than the drive of the operation drive section, and the end face of the cam hole of the blade member is the drive pin of the operation drive section. It is a schematic diagram for explaining the state of the blade driving device when is pressed. 9 is a partially enlarged view of FIG. 8. FIG. 10 is a schematic diagram for explaining a second state of the blade driving device shown in FIG. 1. FIG. 11 is a partially enlarged view of FIG. 10. FIG. FIG. 12 is a schematic diagram for explaining the operation of the blade driving device until the blade driving device switches from the second state shown in FIG. 10 to the first state shown in FIG. FIG. 13 shows that when the blade drive device is in the second state shown in FIG. 10, the blade member is driven by a factor other than the drive of the operation drive section, and the end surface of the cam hole of the blade member is the drive pin of the operation drive section. It is a schematic diagram for explaining the state of the blade driving device when is pressed. 14 is a partially enlarged view of FIG. 13. FIG. FIG. 15 is a view showing a modification of the blade member of the blade driving device shown in FIG. 1; FIG. 16 is a schematic diagram showing an imaging device provided with the blade driving device shown in FIG. FIG. 17 is a perspective view of the blade driving device according to the second embodiment of the invention. 18 is an exploded perspective view of the blade driving device shown in FIG. 17. FIG. 19 is a plan view of the blade member of the blade driving device shown in FIG. 17. FIG. 20 is a schematic diagram for explaining the first state of the blade driving device shown in FIG. 17. FIG. 21 is a partially enlarged view of FIG. 20. FIG. FIG. 22 is a schematic diagram for explaining the operation of the blade driving device until the blade driving device switches from the first state shown in FIG. 20 to the second state. FIG. 23 shows that when the blade drive device is in the first state shown in FIG. 20, the blade member is driven by a factor other than the drive of the operation drive section, and the end face of the cam hole of the blade member is the drive pin of the operation drive section. It is a schematic diagram for explaining the state of the blade driving device when is pressed. 24 is a partially enlarged view of FIG. 23. FIG. 25 is a schematic diagram for explaining a second state of the blade driving device shown in FIG. 17. FIG. 26 is a partially enlarged view of FIG. 25. FIG. 27 is a schematic diagram for explaining the operation of the blade driving device until the blade driving device switches from the second state shown in FIG. 25 to the first state shown in FIG. 20. FIG. FIG. 28 shows that when the blade drive device is in the second state shown in FIG. 25, the blade member is driven by a factor other than the drive of the operation drive section, and the end face of the cam hole of the blade member is the drive pin of the operation drive section. It is a schematic diagram for explaining the state of the blade driving device when is pressed. 29 is a partially enlarged view of FIG. 28. FIG. 30 is a diagram showing a modification of the blade member of the blade driving device shown in FIG. 17. FIG. FIG. 31 is a schematic diagram showing an imaging device provided with the blade driving device shown in FIG. 17. FIG.

1 to 31, embodiments of a blade driving device and an imaging device according to the present invention will be described in detail below. In addition, in FIGS. 1 to 31, the same or corresponding components are denoted by the same reference numerals, and redundant explanations are omitted. In addition, in FIGS. 1 to 31, the scale and dimensions of each component may be exaggerated, and some components may be omitted. Identical or corresponding components are provided with the same reference numerals in each figure.

<First embodiment>
First, referring to FIGS. 1 to 15, the blade driving device according to the first embodiment of the invention will be described in detail. The blade driving device 1 of the present embodiment shown in FIG. 1 is provided between an imaging device (CCD image sensor or CMOS image sensor) and an imaging optical system such as a lens in an imaging device such as a camera or a video camera. It is used to turn on/off a filter for cutting light in a predetermined wavelength range that enters the imaging device. Further, the orientation of the blade driving device 1 when the blade driving device 1 is used inside the image pickup device is not particularly limited, but typically, the blade driving device 1 has a blade member as shown in FIG. 15 (see FIG. 2) are oriented to drive along the direction of gravity.

As shown in FIGS. 1 and 2, the blade driving device 1 includes a base 11, a cover plate 12, a partition plate 13, a circuit board 14, blade members 15, and an operation driving portion 16. contains. Further, the blade member 15 has a transparent glass plate 153a and an infrared cut filter 153b arranged side by side with the transparent glass plate 153a in one axial direction (Z-axis direction).

The blade drive device 1 slides the blade member 15 on the base 11 along one axis direction (the Z-axis direction in the figure) by driving the operation drive unit 16 , thereby moving the blade member 15 relative to the opening 114 of the base 11 . is configured to change the position of Due to such a change in the position of the blade member 15 with respect to the opening 114 of the base 11, the blade driving device 1 does not position the infrared cut filter 153b of the blade member 15 above the opening 114 of the base 11, and the blade member 15 (hereinafter referred to as the "first state" of the blade driving device 1), and the infrared cut filter 153b of the blade member 15 is positioned above the opening 114 of the base 11. state (this state is hereinafter referred to as the “second state” of the blade driving device 1).

The blade driving device 1 is typically used in a surveillance camera that is fixed to an arbitrary location outdoors or indoors. The monitoring camera of the embodiment has an infrared irradiation function, and performs normal imaging with infrared rays cut during the daytime or in an environment with a large amount of light, and at night or in an environment where the lighting is turned off. In such a low-light environment, infrared imaging is performed. The blade driving device 1 is used for such switching between day and night imaging. Specifically, when the surveillance camera takes an image in an environment with a large amount of light, the blade driving device 1 is placed in the second state in which the infrared cut filter 153b of the blade member 15 is positioned above the opening 114 of the base 11. I take the. In the second state, the infrared cut filter 153b of the blade member 15 cuts infrared rays for photographing, thereby improving the image quality of the image obtained by the surveillance camera. On the other hand, when the surveillance camera takes an image in an environment with a small amount of light, the blade driving device 1 does not allow the infrared cut filter 153b of the blade member 15 to be positioned above the opening 114 of the base 11, and the blade member 15 is transparent. A first state is taken in which the glass plate 153a is positioned. In the first state, the surveillance camera can perform infrared imaging, and obtain a clear image even in a low-light environment. Each component of the blade driving device 1 will be described in detail below.

(base 11 and cover plate 12)
The base 11 is a member having a substantially rectangular planar shape, and constitutes a housing of the blade driving device 1 by engaging with the cover plate 12 . A space formed between the base 11 and the cover plate 12 accommodates the partition plate 13 , the blade members 15 , and the operation drive section 16 . The base 11 includes a body portion 111, a wall portion 112, a storage portion 113, an opening portion 114, a stopper 115a (see FIG. 5), a stopper 115b (see FIG. 5), and a pair of guide pins 116a and 116b ( 5), a shaft 117 (see FIG. 5) and two threaded holes (not numbered) formed on the wall 112 for screwing with external threads. The base 11 can be made of a non-magnetic material such as a ceramic material, a resin material, a carbon material, or a weak magnetic material. may have been

The wall portion 112 is upright so as to extend in the +Y direction from each edge of the base 11 in plan view. Two protrusions 1121 extending in the +Y direction are provided on the end surface of the wall portion 112 on the +Y direction side. The cover plate 12 is a flat plate member having a planar shape corresponding to the planar shape of the base 11 and can be made of the same non-magnetic or weakly magnetic material as the base 11 . The cover plate 12 has an opening 121 for passing light incident on the opening 114 of the base 11 and two notches formed at positions corresponding to the two projections 1121 of the wall 112 of the base 11 respectively. a portion 122, a guide pin insertion hole 123 for inserting each of the guide pins 116a and 116b of the base 11, and two screw insertion holes 124 formed at positions corresponding to the two screw holes of the base 11, respectively. ,have. With the components of the blade driving device 1 placed on the base 11, the two protrusions 1121 of the wall 112 of the base 11 are engaged with the two notches 122 of the cover plate 12, respectively. By placing the cover plate 12 on the wall portion 112 of the base 11, inserting two male screws into the two screw insertion holes 124 of the cover plate 12, respectively, and screwing them into the screw holes of the base 11, , the blade drive 1 is assembled.

The housing portion 113 is a bottomed rectangular tubular portion provided on the short side of the body portion 111 on the +Z direction side in plan view, and houses the operation driving portion 16 therein. A plurality of protrusions (not shown) for fixing the operation driving portion 16 are formed in the storage portion 113 , and the operation driving portion 16 is stored and fixed in the storage portion 113 . The depth of the storage portion 113 is set so that only the drive pin 165 of the operation drive portion 16 protrudes in the +Y direction from the body portion 111 when the operation drive portion 16 is stored in the storage portion 113 . Therefore, when the partition plate 13 is placed on the main body 111 with the operation drive unit 16 stored in the storage unit 113, only the drive pin 165 of the operation drive unit 16 protrudes in the +Y direction from the partition plate 13. do.

A notch portion 1131 is formed at the +Z direction end portion of the storage portion 113 . When the blade driving device 1 is assembled, both ends of the coil 1632 of the operation driving portion 16 extend out of the housing of the blade driving device 1 through the notch portion 1131 . Both ends of the coil 1632 extending out of the housing of the blade driving device 1 through the notch 1131 are connected to two terminals 142 of two wires 141 formed on the circuit board 14, respectively. A current is supplied to the coil 1632 from a control unit of an imaging device such as a camera or a video camera via the circuit board 14 to drive the operation driving unit 16 .

The opening 114 is a circular opening formed at a position corresponding to the imaging element of the imaging device when the blade driving device 1 is provided inside the imaging device. The size and shape of the opening 114 are not particularly limited, and are appropriately set according to the size and shape of the imaging element of the imaging device in which the blade driving device 1 is used.

Each of the stoppers 115 a and 115 b is a rectangular parallelepiped member provided on the base 11 so as to extend in the +Y direction, and restricts the sliding of the blade member 15 on the body portion 111 of the base 11 . Each of the stoppers 115a, 115b is made of an elastic material. As shown in FIG. 5, the stopper 115a is provided on the long side of the base 11 in the +X direction in plan view, and restricts the blade member 15 from sliding in the -Z direction. The stopper 115b is provided on the +Z-direction short side of the base 11 in a plan view, and restricts the blade member 15 from sliding in the +Z-axis direction. On the base 11, the blade member 15 is slid between the stoppers 115a and 115b by driving the operation driving section 16. As shown in FIG.

Each of the guide pins 116 a and 116 b is erected on the body portion 111 of the base 11 so as to extend in the +Y direction, and guides the sliding of the blade member 15 on the body portion 111 of the base 11 . Each of the guide pins 116a and 116b has a cylindrical shape and is made of hard material such as hard resin material or metal material. Base end portions of the guide pins 116 a and 116 b are fixed onto the body portion 111 of the base 11 . On the other hand, the tips of the guide pins 116 a and 116 b are inserted through the guide pin insertion holes 123 of the cover plate 12 respectively, and the tips of the guide pins 116 a and 116 b are supported by the guide pin insertion holes 123 of the cover plate 12 . The shaft 117 is provided so as to extend in the +Y direction inside the storage portion 113 and functions as a rotation shaft of the operation driving portion 16 . As shown in FIG. 5 , the shaft 117 is inserted through the central opening of the cylindrical magnet 161 of the operation drive section 16 when the blade drive device 1 is assembled.

(Partition plate 13)
Returning to FIG. 2, the partition plate 13 is a plate-like member having a planar shape corresponding to the planar shape of the base 11, and can be made of the same non-magnetic or weakly magnetic material as the base 11. The partition plate 13 is placed on the main body portion 111 of the base 11 in a state in which the operation driving portion 16 is stored in the storage portion 113 of the base 11, and prevents contact between the operation driving portion 16 and the blade member 15. used for The partition plate 13 has an opening 131 formed at a position corresponding to the opening 114 of the base 11, and two guide pin insertion holes 132 formed at positions corresponding to the guide pins 116a and 116b of the base 11, respectively. , and a drive pin insertion hole 133 for inserting the drive pin 165 of the operation drive unit 16 . The opening 131 is a circular opening having a smaller diameter than the diameter of the opening 114 of the base 11 . When the blade driving device 1 is assembled, the guide pins 116 a and 116 b of the base 11 are inserted through the two guide pin insertion holes 132 , respectively, and the drive pin 165 of the operation drive section 16 is inserted into the drive pin insertion hole 133 . , and the drive pin 165 extends in the +Y direction from the partition plate 13 .

(circuit board 14)
The circuit board 14 is a circuit board made of an insulating material such as a resin material. As shown in FIG. 1, the circuit board 14 is fixed to the −Y direction surface of the housing portion 113 of the base 11 by an adhesive or the like. Two wirings 141 and terminals 142 of the wirings 141 are formed on the -Y direction side surface of the circuit board 14 . Both ends of the coil 1632 of the operation driving section 16 are connected to the two terminals 142, respectively. The wiring 141 of the circuit board 14 is connected to an external device (for example, a processor, a microcomputer, etc., of an imaging device including the blade driving device 1), and current is supplied from the external device to the coil 1632 via the circuit board 14. .

(Blade member 15)
Returning to FIG. 2, the blade member 15 is a plate-shaped member made of a non-magnetic material or a weak magnetic material, is held on the base 11, and is operated and driven so as to change the position of the base 11 with respect to the opening 114. Driven by unit 16 . More specifically, in the present embodiment, the blade member 15 is slid on the base 11 along one axis (the Z-axis direction) by the operation drive unit 16, and the blade member 15 is moved toward the opening 114 of the base 11. position changes. As shown in FIG. 3, the blade member 15 includes a body portion 151, a first opening 152a, a second opening 152b, a transparent glass plate 153a, an infrared cut filter 153b, and a pair of extending portions. 154a, 154b, guide holes 155a, 155b, a stopper engaging portion 156, a cam hole 157, a first engaging projection 158a, and a second engaging projection 158b.

The main body part 151 is a plate-like member having a substantially rectangular planar shape. As shown in FIG. 3, the extended portion 154a extends outward from the long side of the main body 151 in the +X direction in plan view, and extends outward from the long side of the main body 151 in the -X direction. , the extension 154b extends outward. Further, a stopper engaging portion 156 extends upward from the +Z direction short side of the body portion 151 in plan view. Further, the body portion 151 is formed with a first opening 152a and a second opening 152b. The transparent glass plate 153a is provided to cover the first opening 152a, and the infrared cut filter 153b is provided to cover the second opening 152b. The transparent glass plate 153a and the infrared cut filter 153b are fixed on the body portion 151 with an adhesive or any fixture.

The transparent glass plate 153a has a substantially square planar shape and is made of a transparent glass material. The infrared cut filter 153b can be obtained by depositing a dielectric multilayer film on a transparent glass plate having the same shape as the transparent glass plate 153a. It allows light in other wavelength bands, particularly light in the visible light region, to pass through. The transparent glass plate 153a is arranged side by side with the infrared cut filter 153b in one axial direction (Z-axis direction). The blade driving device 1 slides the blade member 15 on the base 11 along the Z-axis direction to position either the transparent glass plate 153a or the infrared cut filter 153b above the opening 114 of the base 11. .

Guide holes 155a and 155b extending in the sliding direction (Z-axis direction) of the blade member 15 are formed in the extending portions 154a and 154b, respectively. The guide pin 116a of the base 11 is inserted through the guide hole 155a, and the guide pin 116b of the base 11 is inserted through the guide hole 155b. The length of each of the guide holes 155a and 155b in the major axis direction (Z-axis direction) is appropriately set according to the required sliding amount of the blade member 15, and the length of each of the guide holes 155a and 155b in the minor axis direction is The width (length in the X-axis direction) is greater than the diameter of the guide pins 116a, 116b. By inserting the guide pins 116a and 116b of the base 11 into the guide holes 155a and 155b, respectively, the blade member 15 is prevented from swinging in a direction different from the sliding direction.

Further, when the blade member 15 slides in the −Z direction, the extending portion 154a abuts against the stopper 115a of the base 11 to restrict the sliding of the blade member 15 in the −Z direction. The stopper engaging portion 156 extends upward from the +Z direction short side of the body portion 151 in a plan view, and contacts the stopper 115b of the base 11 when the blade member 15 slides in the +Z direction. It restricts the sliding of the blade member 15 in the +Z direction.

A cam hole 157 is formed on the short side of the body portion 151 in the +Z direction. A drive pin 165 of the operation drive portion 16 is inserted through the cam hole 157 . With the drive pin 165 of the operation drive unit 16 inserted into the cam hole 157 , the drive pin 165 is rotated by the drive of the operation drive unit 16 , and when the drive pin 165 presses the end surface of the cam hole 157 , the top of the base 11 is pushed. , the blade member 15 slides along one axis (Z-axis direction). As shown in FIG. 3, the cam hole 157 has a substantially long groove shape that is inclined with respect to the long side direction of the body portion 151 (the sliding direction of the blade member 15). Inside the cam hole 157, more specifically, on the end face of the cam hole 157 in the +Z direction, a first engaging protrusion 158a that protrudes in the -Z direction is formed. Further, inside the cam hole 157, more specifically, on the end face of the cam hole 157 in the -Z direction, a second engagement protrusion 158b is formed that protrudes in the +Z direction.

The shape of the first engaging protrusion 158a and the amount of protrusion from the end face of the cam hole 157 are such that when the arm portion 164 starts to rotate by driving the operation driving portion 16, the first engaging protrusion 158a is not within the rotation locus of the drive pin 165, and furthermore, due to an external force caused by dropping, vibration, or the like, the blade member 15 slides on the base 11 in the -Z direction, and the end face of the cam hole 157 is moved to the drive pin 165. is set to be positioned within the rotational locus of the drive pin 165 when is pressed. Therefore, when the vane member 15 slides on the base 11 in the -Z direction due to an external force caused by dropping or vibration, and the end surface of the cam hole 157 pushes the driving pin 165, the first engaging protrusion 158a engages with the driving pin 165 of the operation driving portion 16 to restrict further sliding (driving) of the blade member 15 in the -Z direction.

Similarly, the shape of the second engaging protrusion 158b and the amount of protrusion from the end face of the cam hole 157 are such that when the arm portion 164 starts to rotate due to the driving of the operation driving portion 16, the second engaging protrusion 158b is in the second engaging portion. The blade member 15 moves in the +Z direction on the base 11 due to the external force caused by dropping, vibration, etc., and the end surface of the cam hole 157 is driven. When the pin 165 is pushed, it is set so as to be positioned within the rotational trajectory of the drive pin 165 . Therefore, when the vane member 15 moves in the +Z direction on the base 11 and the end surface of the cam hole 157 pushes the driving pin 165 due to an external force caused by dropping, vibration, or the like, the second engaging projection 158b engages with the driving pin 165 of the operation driving portion 16 to restrict further sliding (driving) of the blade member 15 in the +Z direction. In the blade driving device 1 of the present embodiment, the blade member 15 has the cam hole 157, the first engaging projection 158a, and the second engaging projection 158b as described above, so that the blade driving An external force on the device 1 can be prevented from unintentionally switching the state of the blade drive device 1 between the first state and the second state. 5 to 14 for the operation and principle of the blade driving device 1 related to the prevention of state switching of the blade driving device 1 by the cam hole 157, the first engaging projection 158a, and the second engaging projection 158b. It will be described in detail later with reference.

Returning to FIG. 2 , the operation driving section 16 is driven by current supplied from an external device connected to the wiring 141 of the circuit board 14 and has a function of driving the blade member 15 on the base 11 . More specifically, the operation drive unit 16 has a function of sliding the blade member 15 along one axis (Z-axis direction) on the base 11 in accordance with control from an external device. As shown in FIG. 2, the operating drive 16 includes a cylindrical magnet 161, a yoke 162, a coil assembly 163, an arm portion 164, and a drive pin 165. As shown in FIG.

The cylindrical magnet 161 is a permanent magnet that has a central opening and is magnetized so that one side of the cylindrical shape has an N pole and the other side has an S pole. The shaft 117 of the base 11 is inserted through the central opening of the cylindrical magnet 161 . Therefore, the cylindrical magnet 161 is rotatable around the axis 117 of the base 11 . Furthermore, the cylindrical magnet 161 is integrally attached to the proximal end portion of the arm portion 164 . Therefore, when the cylindrical magnet 161 rotates about the axis 117 of the base 11 , the arm portion 164 also rotates about the axis 117 of the base 11 . Therefore, the shaft 117 of the base 11 functions as a rotating shaft of the cylindrical magnet 161 and a rotating shaft of the arm portion 164 .

The yoke 162 is a U-shaped member made of magnetic material. The yoke 162 has a pair of extending portions 1621a and 1621b that face each other, a connecting portion 1622 that connects the base ends of the pair of extending portions 1621a and 1621b, and a pair of extending portions 1621a and 1621b. Arc portions 1623a and 1623b are included. The base ends of the pair of extending portions 1621a and 1621b are connected by a connecting portion 1622, and the distal end sides of the pair of extending portions 1621a and 1621b are separated from each other. A pair of extending portions 1621a and 1621b are provided with circular arc portions 1623a and 1623b formed to face each other on the surfaces facing each other.

4A and 4B are diagrams for explaining the configuration and operation of the operation drive unit 16. FIG. In FIG. 4, the operation drive unit 16 is illustrated as having an arm portion 164 extending from a cylindrical magnet 161 to the U-shaped open end side of a yoke 162 and rotated by the amount shown. The present invention is not limited to this. The extending direction and length of the arm portion 164 from the cylindrical magnet 161 and the amount of rotation of the arm portion 164 are appropriately set as necessary. FIG. 4 is used only to explain the configuration and operation of the operation drive section 16, and in each embodiment of the present invention, the extension direction and length of the arm section 164 from the cylindrical magnet 161 and the arm It should be noted that the amount of rotation of the portion 164 is appropriately set as required.

As shown in FIGS. 4A and 4B, the cylindrical magnet 161 is arranged such that the peripheral surface of the cylindrical magnet 161 faces the arc portions 1623a and 1623b of the yoke 162. . Magnetic force lines generated from the N pole of the cylindrical magnet 161 pass through the extending portions 1621 a and 1621 b of the yoke 162 and the connecting portion 1622 and then enter the S pole of the cylindrical magnet 161 . Therefore, the magnetic circuit of the operation driving section 16 is formed by the cylindrical magnet 161 and the yoke 162 .

The coil assembly 163 is provided so as to surround the base end portion of the extending portion 1621a. The coil assembly 163 includes a cylindrical coil bobbin 1631, a coil 1632 wound around the outer circumference of the coil bobbin 1631, and a flange portion 1633 provided integrally with the coil bobbin 1631 to suppress the oscillation of the coil bobbin 1631. include. The extending portion 1621 a of the yoke 162 is inserted through the central opening of the coil bobbin 1631 and the coil assembly 163 is attached to the yoke 162 . With the coil assembly 163 attached to the yoke 162 , the coil 1632 surrounds the extension 1621 a of the yoke 162 . When the blade driving device 1 as shown in FIG. 1 is assembled, both ends of the coil 1632 extend outside from the notch 1131 of the base 11 and are connected to the two terminals 142 of the circuit board 14, respectively. be done. In addition, when the blade driving device 1 is assembled, the flange portion 1633 is engaged with the storage portion 113 of the base 11 to prevent the coil assembly 163 from swinging.

By supplying a current to the coil 1632 from an external device connected to the wiring 141 of the circuit board 14, the operation driving section 16 is driven. When a current is supplied to the coil 1632 from an external device connected to the wiring 141 of the circuit board 14 , a magnetic line of force is generated that penetrates the central opening of the coil 1632 according to the direction of the current flowing through the coil 1632 . The magnetic poles of the pair of extensions 1621a and 1621b change. Therefore, by controlling the direction and strength of the electric power supplied to the coil 1632, the magnetic poles of the pair of extending portions 1621a and 1621b of the yoke 162 can be controlled. When a current flows through the coil 1632 , a magnetic force is generated that rotates the cylindrical magnet 161 clockwise or counterclockwise depending on the direction of the current flowing through the coil 1632 . Therefore, by controlling the current supply from the external device to the coil 1632, the cylindrical magnet 161 can be rotated in any direction.

Further, the operation driving unit 16 is configured to realize two steady states in which the cylindrical magnet 161 does not freely rotate in a non-energized state in which current is not supplied from an external device to the coil 1632 via the circuit board 14. ing. As shown in FIGS. 4(a) and 4(b), arc portions 1623a and 1623b each have a shape corresponding to the peripheral surface of cylindrical magnet 161. The distance between each of 1623b and the peripheral surface of the cylindrical magnet 161 is constant. Each of the circular arc portions 1623 a and 1623 b has two edge portions 1624 facing the circumferential surface of the cylindrical magnet 161 . The density of the lines of magnetic force flowing through the yoke 162 is highest at the edge portion 1624 , so the edge portion 1624 is the portion where the magnetic force is strongest in the extending portions 1621 a and 1621 b of the yoke 162 . Therefore, in a non-energized state in which current is not supplied to the coil 1632, the four edge portions 1624 hold the cylindrical magnet 161 by magnetic force, thereby realizing a steady state in which the cylindrical magnet 161 does not freely rotate. ing. In this steady state, the cylindrical magnet 161 does not rotate unless an external force equal to or greater than a predetermined threshold is applied to the cylindrical magnet 161 to rotate the cylindrical magnet 161 . Depending on the shape of the extension portions 1621a and 1621b and the arc portions 1623a and 1623b of the yoke 162, the operation driving portion 16 can be in a first steady state shown in FIG. 4(a) and a second steady state shown in FIG. 4(b). and can be realized.

Next, switching between the first steady state and the second steady state of the operation drive unit 16 will be described in detail with reference to FIGS. 4(a) and 4(b). When a current is supplied to the coil 1632 from an external device connected to the wiring 141 of the circuit board 14 , a magnetic field is generated that penetrates the central opening of the coil 1632 according to the direction of the current flowing through the coil 1632 . The magnetic poles of the pair of extensions 1621a and 1621b change. In the first steady state shown in FIG. 4( a ), when a current in one direction is supplied to the coil 1632 from an external device connected to the wiring 141 of the circuit board 14 , arc portions 1623 a and 1623 b of the yoke 162 and The magnetic force between the cylindrical magnet 161 acts to rotate the cylindrical magnet 161 clockwise as indicated by the arrow in FIG. 4(a). Such a magnetic force rotates the cylindrical magnet 161 clockwise, and the state of the operation drive section 16 changes from the first steady state. After that, when the current supply from the external device to the coil 1632 is stopped, the cylindrical magnet 161 is held by the edge portions 1624 of the circular arc portions 1623a and 1623b, and the state of the operation driving portion 16 is shown in FIG. 4(b). A second steady state is reached. Similarly, in the second steady state shown in FIG. 4B, when a current in the other direction is supplied to the coil 1632 from an external device connected to the wiring 141 of the circuit board 14, the arc portion 1623a of the yoke 162 , 1623b and the cylindrical magnet 161 acts to rotate the cylindrical magnet 161 counterclockwise, as indicated by the arrow in FIG. 4(b). Such a magnetic force causes the cylindrical magnet 161 to rotate counterclockwise, and the state of the operation drive section 16 changes from the second steady state. After that, when the supply of electric current from the external device to the coil 1632 is stopped, the cylindrical magnet 161 is held by the edge portions 1624 of the arc portions 1623a and 1623b, and the state of the operation driving portion 16 is shown in FIG. 4(a). A first steady state is reached. By controlling the supply of current to the coil 1632 in this manner, the state of the operation drive unit 16 can be switched from one of the first steady state and the second steady state to the other.

Arm portion 164 and drive pin 165 have the function of converting rotational motion of cylindrical magnet 161 into sliding motion of blade member 15 . Each of the arm portion 164 and the drive pin 165 can be made of a non-magnetic material or a weak magnetic material. The arm portion 164 has a tapered shape in which the width gradually decreases from the base end side to the tip end side. As shown in FIG. 2, the proximal end of the arm portion 164 is integrated with the cylindrical magnet 161, and when the cylindrical magnet 161 rotates about the axis 117 of the base 11, the arm portion 164 rotates around the axis 117 of the base 11 . The drive pin 165 is a columnar member provided on the distal end side of the arm portion 164 so as to extend in the +Y direction. When the arm portion 164 is rotated about the shaft 117 of the base 11 by driving the operation drive portion 16 , the drive pin 165 pushes the end face of the cam hole 157 of the blade member 15 to slide the blade member 15 on the base 11 . .

Rotational motion of cylindrical magnet 161 is converted into sliding motion of blade member 15 by arm portion 164 and drive pin 165 . In the blade driving device 1 of this embodiment, the first steady state of the operation driving section 16 corresponds to the first state in which the transparent glass plate 153a of the blade member 15 is positioned above the opening 114 of the base 11, and the operation is performed. A second steady state of the drive unit 16 is configured to correspond to a second state in which the infrared cut filter 153b of the blade member 15 is positioned above the opening 114 of the base 11 . Therefore, by controlling the current supply to the coil 1632 of the operation drive unit 16, the blade member 15 is slid on the base 11 in either the +Z direction or the −Z direction, and the state of the blade drive device 1 is changed to the first state. and the second state can be arbitrarily switched.

In the operation drive unit 16, the two steady states in the non-energized state in which current is not supplied to the coil 1632 are the magnetic force between the cylindrical magnet 161 and the arc portions 1623a and 1623b of the yoke 162, more specifically , the cylindrical magnet 161 is held by the magnetic force between the cylindrical magnet 161 and the edge portions 1624 of the arc portions 1623 a and 1623 b of the yoke 162 . The holding force for holding the cylindrical magnet 161 by the magnetic force between the cylindrical magnet 161 and the arc portions 1623a and 1623b of the yoke 162 in the first steady state or the second steady state is the mechanical It is weaker than the holding force when holding the cylindrical magnet 161 by a target mechanism. Therefore, when an external force acts to rotate the cylindrical magnet 161 due to dropping or vibration of the blade driving device 1, the cylindrical magnet 161 is easily rotated, and the state of the blade driving device 1 changes to the second state. It unintentionally changes between state 1 and state 2. Further, when the cylindrical magnet 161 rotates by a predetermined amount or more due to an external force, the magnetic force holding the cylindrical magnet 161 in the first steady state or the second steady state promotes the rotation of the cylindrical magnet 161. It works like that. In the blade driving device 1 of the present embodiment, the cam hole 157, the first engaging projection 158a, and the second engaging projection 158b of the blade member 15 described above prevent the blade driving device 1 from dropping, vibrating, and the like. A change in the state of the blade driving device 1 due to factors other than the driving of the operation driving unit 16 is prevented. 5 to 14, state switching of the blade driving device 1 provided by the cam hole 157 of the blade member 15, the first engaging protrusion 158a, and the second engaging protrusion 158b. Elaborate on prevention.

FIGS. 5, 7, 8, 10, 12, and 13 are plan views of the blade driving device 1 viewed from the +Y direction, and illustrate prevention of state switching of the blade driving device 1. Only the constituent elements necessary for doing so are illustrated, and other constituent elements are omitted. 5 to 14 show the rotation trajectory of the driving pin 165 when the arm portion 164 of the operation driving portion 16 is rotated by the driving of the operation driving portion 16 by a dashed line. 6, 9, 11, and 14 are enlarged views of the area near the cam hole 157 of the blade member 15 shown in FIGS. 5, 8, 10, and 13, respectively.

First, with reference to FIGS. 5 to 13, the operation of blade driving device 1 from the first state will be described in detail. FIG. 5 shows the first state of the blade driving device 1. As shown in FIG. That is, in the state shown in FIG. 5 , the operation driving section 16 is in the first steady state, and no external force is applied to the blade member 15 due to dropping, vibration, or the like of the blade driving device 1 . As shown in FIG. 5 , in the first state of blade driving device 1 , transparent glass plate 153 a of blade member 15 is positioned above opening 131 of partition plate 13 . Since the opening 131 of the partition plate 13 is formed at a position corresponding to the opening 114 of the base 11, in the first state of the blade driving device 1, the transparent glass plate 153a of the blade member 15 is located at the base 11. Located over the opening 114 .

Further, as shown in FIG. 6, in the first state of the blade driving device 1, the first engaging projection 158a formed on the +Z direction end surface of the cam hole 157 of the blade member 15 It is not positioned within the rotational trajectory of the drive pin 165 of the operation drive unit 16 indicated by the dashed line. Therefore, when the operation driving portion 16 is driven in the first state of the blade driving device 1 and the arm portion 164 rotates clockwise, the first engagement protrusion 158 a It is not positioned within the rotational trajectory of the drive pin 165 . Therefore, the clockwise rotation of the driving pin 165 from the first state of the blade driving device 1 is not restricted by the first engagement protrusion 158a.

When the operation driving portion 16 is driven in the first state of the blade driving device 1 shown in FIG. The state shown in (a) is reached. In the state shown in FIG. 7A, the drive pin 165 abuts the end surface of the cam hole 157 in the -Z direction. When the drive pin 165 rotates further clockwise from the state shown in FIG. 7(a), the drive pin 165 pushes the −Z direction end surface of the cam hole 157 in the −Z direction, and the state shown in FIG. 7(b). , the blade member 15 slides on the base 11 in the -Z direction. The blade member 15 is slid in the -Z direction by the drive pin 165 until the extended portion 154a of the blade member 15 contacts the stopper 115a of the base 11. As shown in FIG. When the extended portion 154a of the blade member 15 comes into contact with the stopper 115a of the base 11, the sliding of the blade member 15 in the -Z direction ends, and the blade driving device 1 enters the second state shown in FIG. 7(c). switch to state. In this manner, the first engaging projection 158a of the blade member 15 is engaged when the arm portion 164 starts to rotate clockwise by driving the operation driving portion 16 in the first state of the blade driving device 1. In addition, it is configured so as not to be positioned within the rotation track of the drive pin 165 of the operation drive portion 16 .

Next, in the first state of the blade driving device 1 shown in FIG. 5, the prevention of state switching of the blade driving device 1 when an external force is applied to the blade member 15 due to dropping or vibration of the blade driving device 1 will be described in detail. describe. In the first state of the blade driving device 1 shown in FIG. 5, when an external force is applied to the blade member 15 due to dropping or vibration of the blade driving device 1, the blade member 15 slides in the -Z direction, and the blade member 15 pushes the drive pin 165 of the operation drive unit 16 in the -Z direction. When the drive pin 165 of the operation drive unit 16 is pushed by the end face of the cam hole 157 of the blade member 15, the drive pin 165 of the operation drive unit 16 rotates slightly (for example, about 2°), and the blade The state of the driving device 1 changes from the first state to the state shown in FIG.

FIG. 9 is an enlarged view of the area near the cam hole 157 of the blade member 15 shown in FIG. As shown in FIG. 9, the first engagement protrusion 158a formed on the +Z direction end face of the cam hole 157 of the blade member 15 is positioned within the rotational trajectory of the drive pin 165 of the operation drive section 16. To position. In this way, when the blade driving device 1 is in the first state, the first engaging projection 158a of the blade member 15 is applied with an external force to the blade member 15 due to falling or vibration of the blade driving device 1. 15 of the cam hole 157 is configured to be positioned within the rotational orbit of the drive pin 165 of the operation drive section 16 when the drive pin 165 of the operation drive section 16 is pushed. As shown in FIG. 9, the drive pin 165 of the operating drive portion 16 engages the first engagement projection 158a of the blade member 15, and the drive pin 165 of the operating drive portion 16 is further rotated. movement is restricted. Therefore, even if the external force applied to the blade member 15 due to dropping or vibration of the blade driving device 1 exceeds the holding force of the operation driving unit 16 with respect to the cylindrical magnet 161 in the first steady state, the external force The amount of rotation of the cylindrical magnet 161 of the operation driving section 16 is suppressed to a slight amount, and the operation driving section 16 does not switch from the first steady state to the second steady state. Therefore, it is possible to prevent the state of the blade driving device 1 from being unintentionally switched from the first state to the second state due to factors other than the driving of the operation driving unit 16, such as dropping or vibration of the blade driving device 1. can do.

In addition, since the external force caused by dropping or vibration of the blade driving device 1 is temporary, the driving pin 165 of the operation driving portion 16 engages with the first engagement protrusion 158a of the blade member 15, and the operation driving is performed. After restricting further rotation of the drive pin 165 of the portion 16, the external force applied to the blade member 15 is released. When the external force applied to the blade member 15 is released, the magnetic force between the cylindrical magnet 161 of the operation driving portion 16 and the arc portions 1623a and 1623b of the yoke 162 causes the cylindrical magnet 161 to move to the first stationary state. It acts to return to the state, and the operation drive part 16 returns to the first steady state. As a result, the blade driving device 1 can return to the first state even after an external force due to dropping or vibration of the blade driving device 1 is applied. Therefore, even without using a special mechanism for releasing the engagement between the drive pin 165 of the operation drive portion 16 and the first engaging protrusion 158a of the blade member 15, the operation drive portion 16 can be maintained in the first steady state. state can be returned.

Next, the operation of the blade driving device 1 from the second state will be described in detail with reference to FIGS. 10 to 14. FIG. FIG. 10 shows the second state of the blade driving device 1. FIG. That is, in the state shown in FIG. 10 , the operation driving section 16 is in the second steady state, and no external force is applied to the blade member 15 due to dropping or vibration of the blade driving device 1 .

As shown in FIG. 10 , in the second state of blade driving device 1 , infrared cut filter 153 b of blade member 15 is positioned above opening 131 of partition plate 13 . Since the opening 131 of the partition plate 13 is formed at a position corresponding to the opening 114 of the base 11 , in the second state of the blade driving device 1 , the infrared cut filter 153 b of the blade member 15 is located in the base 11 . Located over the opening 114 .

Further, as shown in FIG. 11, in the second state of the blade driving device 1, the second engagement protrusion 158b formed on the end surface of the cam hole 157 of the blade member 15 in the -Z direction is It is not positioned within the rotational trajectory of the drive pin 165 of the operation drive unit 16 indicated by the dashed line. Therefore, when the operation driving portion 16 is driven in the second state of the blade driving device 1 and the arm portion 164 rotates in the counterclockwise direction, the second engaging protrusion 158b is engaged with the operation driving portion 16 is not positioned within the rotational trajectory of the drive pin 165. Therefore, the rotation of the driving pin 165 in the counterclockwise direction from the second state of the blade driving device 1 is not restricted by the second engagement protrusion 158b.

When the operation driving portion 16 is driven in the second state of the blade driving device 1 shown in FIG. 10, the driving pin 165 rotates counterclockwise in the cam hole 157, and the blade driving device 1 12(a). In the state shown in FIG. 12( a ), the drive pin 165 abuts on the +Z direction end face of the cam hole 157 . When the drive pin 165 rotates further counterclockwise from the state shown in FIG. 12(a), the drive pin 165 pushes the +Z direction end face of the cam hole 157 in the +Z direction, and the state shown in FIG. As shown, the blade member 15 is slid on the base 11 in the +Z direction. The blade member 15 is slid in the +Z direction by the driving pin 165 until the stopper engaging portion 156 of the blade member 15 abuts against the stopper 115b of the base 11 . When the stopper engaging portion 156 of the blade member 15 comes into contact with the stopper 115b of the base 11, the blade member 15 stops sliding in the +Z direction, and the blade driving device 1 is in the first state shown in FIG. 12(c). state. In this way, in the second state of the blade driving device 1, the second engagement protrusion 158b of the blade member 15 causes the arm portion 164 to start rotating in the counterclockwise direction when the operation driving portion 16 is driven. It is configured so as not to be positioned within the rotation track of the drive pin 165 of the operation drive unit 16 at that time.

Next, in the second state of the blade driving device 1 shown in FIG. 10, the prevention of state switching of the blade driving device 1 when an external force is applied to the blade members 15 due to dropping or vibration of the blade driving device 1 will be described in detail. describe. In the second state of the blade driving device 1 shown in FIG. , pushes the driving pin 165 of the operation driving portion 16 in the +Z direction. When the drive pin 165 of the operation drive unit 16 is pushed by the end face of the cam hole 157 of the blade member 15, the drive pin 165 of the operation drive unit 16 rotates slightly (for example, about 2°), and the blade The state of the driving device 1 changes from the first state to the state shown in FIG.

FIG. 14 is an enlarged view of the area near the cam hole 157 of the blade member 15 shown in FIG. As shown in FIG. 14, the second engaging protrusion 158b formed on the end surface of the cam hole 157 of the blade member 15 in the -Z direction is located within the rotational trajectory of the driving pin 165 of the operation driving section 16. Located in In this way, when the blade driving device 1 is in the second state, the second engaging projection 158b of the blade member 15 is applied with an external force to the blade member 15 due to falling or vibration of the blade driving device 1, and the blade member 15 of the cam hole 157 is configured to be positioned within the rotational orbit of the drive pin 165 of the operation drive section 16 when the drive pin 165 of the operation drive section 16 is pushed. The driving pin 165 of the operation driving portion 16 engages with the second engagement protrusion 158b of the blade member 15, and further rotation of the driving pin 165 of the operation driving portion 16 is restricted. Therefore, even if the external force applied to the blade member 15 due to dropping or vibration of the blade driving device 1 exceeds the holding force of the operation driving unit 16 with respect to the cylindrical magnet 161 in the second steady state, the external force The amount of rotation of the cylindrical magnet 161 of the operation driving section 16 is suppressed to a slight amount, and the operation driving section 16 does not switch from the second steady state to the first steady state. Therefore, it is possible to prevent the state of the blade driving device 1 from being unintentionally switched from the second state to the first state due to a factor other than the driving of the operation driving unit 16, such as dropping or vibration of the blade driving device 1. can do.

Further, after the driving pin 165 of the operation driving portion 16 is engaged with the second engaging protrusion 158b of the blade member 15 to restrict further rotation of the driving pin 165 of the operation driving portion 16, the blade member 15 is released. When the external force applied to the blade member 15 is released, the magnetic force between the cylindrical magnet 161 of the operation driving portion 16 and the arc portions 1623a and 1623b of the yoke 162 causes the cylindrical magnet 161 to move to the second stationary state. It acts to return to the state, and the operation drive 16 returns to the second steady state. As a result, the blade driving device 1 can return to the second state even after an external force due to dropping, vibration, or the like of the blade driving device 1 is applied. Therefore, even without using a special mechanism for releasing the engagement between the drive pin 165 of the operation drive portion 16 and the second engaging protrusion 158b of the blade member 15, the operation drive portion 16 can be maintained in the second steady state. state can be returned.

The blade driving device 1 of the present embodiment uses the blade member 15 including the cam hole 157, the first engaging protrusion 158a, and the second engaging protrusion 158b as described above. It is possible to prevent the state of the blade driving device 1 from being unintentionally switched between the first state and the second state due to a factor other than the driving of the operation driving unit 16, such as dropping or vibration.

It should be noted that the blade driving device 1 of this embodiment, which has been described in detail with reference to the drawings, is merely an example of the present invention, and the scope of the present invention is not limited thereto. For example, the shape of the cam hole 157, the first engagement protrusion 158a, and the second engagement protrusion 158b of the blade member 15 is determined by the driving of the operation drive section 16, as described above. The portion 164 pushes the end surface of the cam hole 157 of the blade member 15, and when the blade member 15 is driven, it does not come into contact with the drive pin 165 of the operation drive portion 16, and the operation drive portion such as drop or vibration of the blade drive device 1 is prevented. The vane member 15 is rotated by a factor other than the driving of the blade member 16, and the end surface of the cam hole 157 of the vane member 15 engages with the driving pin 165 of the operation driving portion 16, thereby restricting the driving of the vane member 15. is not particularly limited.

In addition, in the illustrated embodiment, two engaging protrusions 158a and 158b are formed inside the cam hole 157 of the blade member 15, but the present invention is not limited to this. A mode in which only one of the engaging protrusions 158a and 158b is formed inside the cam hole 157 of the blade member 15 is also within the scope of the present invention. For example, FIG. 15 shows a modification of the blade member 15. As shown in FIG. In the modified example of the blade member 15 shown in FIG. 15, the first engaging protrusion 158a is omitted. When such a modified example of the blade member 15 is used, the blade driving device 1 is changed from the second state to the first state by a factor other than the driving of the operation driving section 16, such as dropping or vibration of the blade driving device 1. Switching is prevented by the second engaging protrusion 158b.

The cam hole 157 of the blade member 15, the first engagement protrusion 158a, and the second engagement protrusion 158b prevent switching of the state of the blade driving device 1 by driving the operation driving section 16. It is particularly useful when the sliding direction of the blade member 15 and the direction of gravity match. When the blade member 15 is slid by the operation drive unit 16 along the direction of gravity, the blade member 15 is lifted against gravity in the first state. In this state, the weight of the blade member 15 functions as a force to switch the state of the blade driving device 1 from the first state to the second state. Therefore, when an external force is applied to the blade member 15 due to dropping or vibration of the blade driving device 1, the state of the blade driving device 1 is easily switched from the first state to the second state. In the blade driving device 1 of the present embodiment, the cam hole 157 and the first engagement projection 158a of the blade member 15 can effectively prevent such state switching of the blade driving device 1 .

Next, with reference to FIG. 16, an imaging device provided with the blade driving device 1 of the first embodiment will be described in detail. An imaging device 100 shown in FIG. 16 is a monitoring camera that is fixed to an arbitrary location outdoors or indoors and used to acquire moving images. The imaging apparatus 100 includes a housing 110, a control unit (not shown) such as a CPU and a microcomputer provided in the housing 110, and an imaging optical system configured by a plurality of optical elements such as lenses held by the housing 110. 120 , an imaging device (not shown) arranged in the housing 110 for capturing an optical image formed by the imaging optical system 120 , and the above-described second optical system provided between the imaging device and the imaging optical system 120 . and a blade driving device 1 of one embodiment.

Within the housing 110, the blade driving device 1 is fixedly held so that the opening 114 of the base 11 is positioned in front of the imaging surface of the imaging device. In addition, the control unit of the imaging device 100 is connected to the wiring 141 of the circuit board 14 of the blade driving device 1, and the operation driving unit 16 is driven according to the control from the control unit of the imaging device 100. A state is arbitrarily switched between a first state and a second state. Using such a blade driving device 1, the imaging device 100 can perform imaging while the blade driving device 1 is in the first state, so that infrared rays are not cut off. On the other hand, the imaging device 100 can perform imaging in a state in which infrared rays are cut by performing imaging when the blade driving device 1 is in the second state.

<Second embodiment>
Next, a second embodiment of the blade driving device according to the present invention will be described in detail with reference to FIGS. 17 to 30. FIG. Members or elements having the same actions or functions as the members or elements in the above-described first embodiment are denoted by the same reference numerals, and parts not specifically described are the same as in the first embodiment.

Hereinafter, the blade driving device according to the second embodiment will be described with a focus on differences from the blade driving device according to the first embodiment, and the description of the same items will be omitted. The power generating device of the second embodiment is based on the same concept as the blade driving device 1 of the first embodiment. In the blade drive device 1 according to the first embodiment, the blade member 15 is configured to slide along one axis (Z-axis direction) by being driven by the operation drive unit 16. However, the blade drive device 1 according to the second embodiment The blade driving device is configured such that the blade member 15 is rotated around a predetermined axis by driving the operation driving section 16 .

The blade driving device 2 of the present embodiment shown in FIG. 17 is provided between an imaging device and an imaging optical system such as a lens in an imaging device such as a camera or a video camera, and limits the amount of light incident on the imaging device. It is used to switch the filter for and to switch on/off the incidence of light to the imaging device.

17(a) is a perspective view of the blade driving device 2, and FIG. 17(b) is a perspective view of the blade driving device 2 seen from an angle different from that of FIG. 17(a). As shown in FIGS. 17 and 18, the blade driving device 2 includes a base 21, a first cover plate 22a, a second cover plate 22b, a first partition plate 23a, and a second It includes a partition plate 23b, a circuit board 24, a blade member 25, a shutter blade 26, a first operation drive section 16a, and a second operation drive section 16b. Further, the blade member 25 has an ND filter 253 .

The blade driving device 2 rotates the blade member 25 on the base 21 by driving the first operation driving section 16a, thereby changing the position of the blade member 25 with respect to the opening 214 of the base 21, By driving the operation driving portion 16b, the position of the shutter blade 26 with respect to the opening 214 of the base 21 is changed by rotating the shutter blade 26 on the base 21. As shown in FIG. In the blade driving device 2 , the first operation driving section 16 a and the second operation driving section 16 b are independently controlled and driven by external equipment connected to the circuit board 24 . By changing the positions of the blade member 25 and the shutter blade 26 with respect to the opening 214 of the base 21, the blade driving device 2 switches on and off the filter for limiting the amount of light incident on the image pickup device, and switches the filter to the image pickup device. can be switched on and off independently of each other. In particular, with respect to on/off switching of the filter, the blade driving device 2 operates in a state where the ND filter 253 of the blade member 25 is not positioned above the opening 214 of the base 21 (hereinafter, this state is referred to as the "first state" of the blade driving device 2). state”) and a state in which the ND filter 253 of the blade member 25 is positioned above the opening 214 of the base 21 (hereinafter, this state is referred to as a “second state” of the blade driving device 2). can be done. Similarly, regarding turning on/off of light incident on the imaging device, the blade driving device 2 is in a state where the shutter blade 26 is not positioned over the opening 214 of the base 21 (hereinafter, this state is referred to as a “shutter off state” of the blade driving device 2). state") and a state in which the shutter blade 26 is positioned above the opening 214 of the base 21 (hereinafter, this state is referred to as a "shutter ON state" of the blade driving device 2).

The blade driving device 2 is a so-called normally open type blade driving device that is normally used in a first state related to on/off of the filter and a shutter-off state related to on/off of light incident on the imaging device. and can be used in imaging devices such as general compact cameras. Regarding turning on and off the filter, the blade driving device 2 takes the first state when the imaging device performs normal imaging. On the other hand, when the imaging device performs imaging in a state in which the amount of light incident on the imaging element is limited, the blade driving device 2 takes the second state. On the other hand, the blade driving device 2 switches from the shutter-off state to the shutter-on state or vice versa at desired timing such as the photographing timing of the imaging device, according to the control from the external device. Each component of the blade driving device 2 will be described in detail below.

(Base 21, first cover plate 22a, and second cover plate 22b)
The base 21 is a member having a substantially rectangular planar shape, and constitutes a housing of the blade driving device 2 by engaging with the first cover plate 22a and the second cover plate 22b. A first partition plate 23a, a second partition plate 23b, a blade member 25, and a shutter blade 26 are accommodated in a space formed between the base 21 and the first cover plate 22a. The first operation drive section 16a and the second operation drive section 16b are accommodated in the space formed between the base 21 and the second cover plate 22b. The base 21 includes a flat plate-like body portion 211 having a substantially rectangular plan view, a wall portion 212, a storage portion 213, an opening portion 214, a stopper 215a (see FIG. 20), and a stopper 215b (see FIG. 20). , a shaft 216a (see FIG. 20), a shutter blade shaft 216b (see FIG. 17(a)), and a first shaft 217 (see FIG. 20) that functions as a rotation shaft of the first operation drive unit 16a. and a second shaft (no reference number) that functions as a rotation shaft of the second operation drive portion 16b.

The wall portion 212 is upright so as to extend in the +Y direction from each edge of the base 21 in plan view. The wall portion 212 is formed with three recesses 2121 for fixing the first cover plate 22a to the base 21 and two recesses 2122 for fixing the second cover plate 22b to the base 21. . The first cover plate 22 a is a flat plate member having a planar shape corresponding to the planar shape of the base 21 . The first cover plate 22a has an opening 221a for passing light incident on the opening 214 of the base 21 and three recesses 2121 formed in the wall 212 of the base 21, respectively. It has an engaging portion 222a and a plurality of holes through which the shaft 216a, the shutter blade shaft 216b, and the stoppers 215a and 215b are inserted. The first cover plate 22a is placed on the wall portion 212 of the base 21, and the three engaging portions 222a of the first cover plate 22a are engaged with the three concave portions 2121 of the wall portion 212 of the base 21, respectively. Thereby, the first cover plate 22 a is fixed to the base 21 .

The second cover plate 22 b is a flat plate member having a planar shape corresponding to the planar shape of the storage portion 213 . The second cover plate 22b has two openings 221b for exposing the coil assembly 163 of the first operation drive section 16a and the coil assembly 163 of the second operation drive section 16b to the outside, and two engaging portions 222 b formed at positions respectively corresponding to the two recesses 2122 of the wall portion 212 . The second cover plate 22b is placed on the −Y direction surface of the housing portion 213 of the base 21, and the two engaging portions 222b of the second cover plate 22b are engaged with the two wall portions 212 of the base 21. By engaging the recess 2122, the second cover plate 22b is fixed to the base 21. As shown in FIG. When the blade driving device 2 is assembled, both ends of the coils 1632 of the first operation driving portion 16a and the second operation driving portion 16b are exposed to the outside of the second cover plate 22b through the two openings 221b. extend to Both ends of the coils 1632 of the first operation driving portion 16a and the second operation driving portion 16b exposed through the two openings 221b are connected to the terminals 242 (total are connected to four terminals 242). A current is independently supplied to the coils 1632 of the first operation drive section 16a and the second operation drive section 16b from an external device such as a control section of the imaging device via the circuit board 24, and the first operation drive section 16a and the second operation drive 16b are driven independently of each other.

The housing portion 213 is a rectangular tube-shaped portion provided on the short side of the main body portion 211 on the +X direction side in a plan view. store. The housing portion 213 includes a plurality of protrusions for fixing the first operation driving portion 16a and the second operation driving portion 16b, a driving pin 165 of the first operation driving portion 16a, and the second operation driving portion. A hole for projecting the driving pin 165 of 16b in the +Y direction is formed, and the first operation driving portion 16a and the second operation driving portion 16b are housed and fixed in the housing portion 113 . When the first operation drive section 16a and the second operation drive section 16b are stored in the storage section 213, the drive pin 165 of the first operation drive section 16a and the drive pin 165 of the second operation drive section 16b are pulled from the base 21. also protrudes in the +Y direction.

The opening 214 is a circular opening formed at a position corresponding to the imaging device of the imaging device when the blade driving device 2 is provided inside the imaging device. The size and shape of the opening 214 are not particularly limited, and are appropriately set according to the size and shape of the imaging element of the imaging device in which the blade driving device 2 is used.

Each of the stoppers 215 a and 215 b is a member provided on the base 21 so as to extend in the +Y direction, and restricts rotation of the blade member 25 on the main body portion 211 of the base 21 . Each of the stoppers 215a, 215b is made of an elastic material. As shown in FIG. 20, the stopper 215a is provided on the lower left side of the base 21 in FIG. 20 in plan view, and restricts the rotation of the blade member 25 in the counterclockwise direction. The stopper 215b is provided on the upper right side of the base 21 in FIG. 20 in plan view, and restricts the clockwise rotation of the blade member 25. On the base 21, the blade member 25 is rotated between the stoppers 215a and 215b by the drive of the operation drive section 16. As shown in FIG.

The shaft 216 a is provided on the body portion 211 so as to extend in the +Y direction, and functions as a rotation shaft for the blade member 25 . The shutter blade shaft 216b is provided on the housing portion 213 so as to extend in the +Y direction, and functions as a rotation shaft for the shutter blade 26. As shown in FIG. When the blade driving device 2 is assembled, the shaft 216a is inserted into the shaft insertion hole 255 of the blade member 25, and the shutter blade shafts are inserted into the shaft insertion holes 262 of the blades 261a, 261b, and 261c constituting the shutter blade 26. 216b is inserted.

Each of the first shaft 217 and the second shaft is provided so as to extend in the +Y direction above the storage portion 213, and rotates the first operation driving portion 16a and the second operation driving portion 16b, respectively. Acts as an axis. When the blade driving device 2 is assembled, the first shaft 217 is inserted through the central opening of the cylindrical magnet 161 of the first operation driving portion 16a, and the cylindrical magnet of the second operation driving portion 16b is inserted. A second shaft is inserted through the central opening at 161 .

(First partition plate 23a and second partition plate 23b)
Returning to FIG. 18 , each of the first partition plate 23 a and the second partition plate 23 b is a flat plate member having a planar shape corresponding to the planar shape of the base 21 . The first partition plate 23 a is provided between the blade member 25 and the shutter blade 26 and used to prevent contact between the blade member 25 and the shutter blade 26 . The second partition plate 23b is provided between the shutter blade 26 and the first operation drive portion 16a and the second operation drive portion 16b, and is provided between the shutter blade 26, the first operation drive portion 16a and the second operation drive portion 16a. is used to prevent contact with the operation drive portion 16b. Each of the first partition plate 23a and the second partition plate 23b has an opening 231 formed at a position corresponding to the opening 214 of the base 21 and the driving pin 165 of the first operation driving section 16a is inserted therethrough. a first drive pin insertion hole 232a for driving, a second drive pin insertion hole 232b for inserting the drive pin 165 of the second operation driving portion 16b, a shaft 216a, a shutter blade shaft 216b, a stopper 215a, and a plurality of holes for inserting the respective 215b. When the blade drive device 2 is assembled, the drive pin 165 of the first operation drive portion 16a is inserted through the first drive pin insertion hole 232a of the first partition plate 23a and the second partition plate 23b, It extends in the +Y direction from the first partition plate 23a and the second partition plate 23b. Similarly, the drive pin 165 of the second operation drive portion 16b is inserted through the second drive pin insertion hole 232b of the first partition plate 23a and the second partition plate 23b, and the first partition plate 23a and the second partition plate 23b are inserted. 2 extending in the +Y direction from the second partition plate 23b.

(circuit board 24)
The circuit board 24 is a circuit board made of an insulating material such as a resin material. As shown in FIG. 17, the circuit board 24 is fixed on the second cover plate 22b with an adhesive or the like. Two pairs of wirings 241 (four wirings 241 in total) and terminals 242 of the wirings 241 (four terminals 242 in total) are formed on the -Y direction surface of the circuit board 24 . Both ends of the coil 1632 of the first operation drive section 16a are connected to the terminals 242 of one pair of wires 241, respectively, and the coil 1632 of the second operation drive section 16b is connected to the terminals 242 of the other pair of wires 241. are connected to each other. An external device is connected to the wiring 241 of the circuit board 24 , and current is supplied from the external device to the coils 1632 of the first operation driving section 16 a and the second operation driving section 16 b via the circuit board 24 .

(Blade member 25)
Returning to FIG. 18, the blade member 25 is a plate-like member held on the base 21 and driven by the first operation driving section 16a so that the position of the base 21 relative to the opening 214 is changed. More specifically, in this embodiment, the blade member 25 is rotated on the base 21 about the shaft 216a by the first operation driving section 16a, and the position of the blade member 25 with respect to the opening 214 of the base 21 is changed. changes. As shown in FIG. 19, the blade member 25 includes a main body portion 251, an opening 252, an ND filter 253, stopper engaging portions 254a and 254b, a shaft insertion hole 255, a cam hole 256, a third It has one engaging protrusion 257a and a second engaging protrusion 257b.

The body portion 251 is a plate-like member that rotates about the shaft 216a. As shown in FIG. 19 , an opening 252 is formed in the body portion 251 , and an ND filter 253 is provided on the body portion 251 so as to cover the opening 252 . The ND filter 253 is fixed on the body portion 251 by an adhesive or any fixture. The ND filter 253 can be obtained by evaporating a dielectric multilayer film on a transparent glass plate of arbitrary shape, and limits the amount of light incident on the ND filter 253 .

A stopper engaging portion 254a extending in the -X direction and a stopper engaging portion 254b extending in the -X direction are formed from the tip portion of the main body portion 251 (the portion on the +Z direction side in FIG. 19). The stopper engaging portion 254a engages with the stopper 215a of the base 21 to restrict the counterclockwise rotation of the blade member 25 when the blade member 25 rotates about the shaft 216a in the counterclockwise direction. do. The stopper engaging portion 254b engages with the stopper 215b of the base 21 to restrict the clockwise rotation of the blade member 25 when the blade member 25 rotates clockwise about the shaft 216a.

A shaft insertion hole 255 for inserting the shaft 216a of the base 21 is formed in the base end portion of the body portion 251 (the portion on the -Z direction side in FIG. 19). The shaft 216 of the base 21 is inserted through the shaft insertion hole 255 , and the shaft 216 of the base 21 functions as a rotation shaft of the blade member 25 . A cam hole 256 is formed at a position close to the shaft insertion hole 255 at the proximal end of the body portion 251 . The drive pin 165 of the first operation drive portion 16 a is inserted through the cam hole 256 . In a state in which the drive pin 165 of the first operation drive portion 16a is inserted through the cam hole 256, the drive pin 165 is rotated by the drive of the first operation drive portion 16a, and the drive pin of the first operation drive portion 16a is driven. When 165 pushes the end surface of cam hole 256, blade member 25 rotates on base 21 around shaft 216a. As shown in FIG. 19, the cam hole 256 has a substantially rhombic shape flattened in the X direction. Inside the cam hole 256, more specifically, on the end face of the cam hole 256 on the -Z direction and -X direction side, a first engaging protrusion 257a that protrudes toward the center of the cam hole 256 is formed. It is Further, inside the cam hole 256, more specifically, on the end face of the cam hole 256 on the -Z direction and +X direction side, there is a second engaging protrusion 257b that protrudes toward the center of the cam hole 256. formed.

As in the blade driving device 1 of the first embodiment, also in the blade driving device 2 of the present embodiment, the shape of the first engaging protrusion 257a and the amount of protrusion from the end surface of the cam hole 256 are determined according to the first operation. When the arm portion 164 of the first operation driving portion 16a starts to rotate by driving the driving portion 16a, the first engaging protrusion 257a rotates the driving pin 165 of the first operation driving portion 16a. Further, the vane member 25 rotates on the base 21 around the shaft 216a due to an external force caused by dropping, vibration, or the like, and the end surface of the cam hole 256 moves toward the first operation driving portion 16a. When the drive pin 165 is pushed, it is set to be positioned within the rotational locus of the drive pin 165 of the first operation drive portion 16a. Therefore, when the vane member 25 rotates on the base 11 due to an external force caused by dropping, vibration, or the like, and the end face of the cam hole 256 pushes the driving pin 165 of the first operation driving portion 16a, the first engages with the driving pin 165 of the first operation driving portion 16a to restrict further rotation (driving) of the blade member 25. As shown in FIG.

Similarly, the shape of the second engagement protrusion 257b and the amount of protrusion from the end face of the cam hole 256 are set to the second angle when the arm portion 164 starts rotating by driving the first operation drive portion 16a. is not positioned within the rotational trajectory of the driving pin 165 of the first operation driving portion 16a, and the blade member 25 is rotated on the base 21 by an external force caused by dropping, vibration, or the like. However, when the end surface of the cam hole 256 pushes the drive pin 165 of the first operation drive portion 16a, it is set to be positioned within the rotational locus of the drive pin 165 of the first operation drive portion 16a. . Therefore, when the vane member 25 rotates on the base 21 and the end surface of the cam hole 256 pushes the drive pin 165 of the first operation drive portion 16a due to an external force caused by dropping, vibration, or the like, the second engages with the driving pin 165 of the first operation driving portion 16a to restrict further rotation (driving) of the blade member 25. As shown in FIG. In the blade driving device 2 of the present embodiment, the blade member 25 has the cam hole 256, the first engaging projection 257a, and the second engaging projection 257b as described above, so that the blade driving An external force on the device 2 can be prevented from unintentionally switching the state of the vane drive device 2 between the first state and the second state. 22 to 31 for the operation and principle of the blade driving device 2 regarding the prevention of state switching of the blade driving device 2 by the cam hole 256, the first engaging projection 257a, and the second engaging projection 257b. It will be described in detail later with reference.

(Shutter blade 26)
Returning to FIG. 18, the shutter blade 26 is a plate-like member held on the base 21 and driven by the second operation drive section 16b so that the position of the base 21 with respect to the opening 214 is changed. More specifically, in the present embodiment, the shutter blade 26 is rotated on the base 21 about the shutter blade shaft 216b by the second operation drive section 16b, and the shutter blade 26 moves toward the opening 214 of the base 21. 26 positions change. The shutter blade 26 is composed of three blades 261a, 261b, and 261c that are interlocked by driving of the second operation drive section 16b. The three blades 261a, 261b, and 261c overlap each other and are folded in a shutter-off state in which the shutter blade 26 is not positioned over the opening 214 of the base 21, and the shutter blade 26 is positioned over the opening 214 of the base 21. In the ON state, it is configured to deploy. In the shutter-off state, the three blades 261a, 261b, and 261c are folded so as to overlap each other, so the space for housing the shutter blades 26 can be reduced. On the other hand, in the shutter-off state, three blades 261a, 261b, 261c are deployed to cover a wide range. As a result, light entering the opening 214 of the base 21 can be reliably blocked in the shutter-on state.

Each of the blades 261a, 261b, and 261c has a shaft insertion hole 262 through which the shutter blade shaft 216b is inserted, and a cam hole 263 through which the drive pin 165 of the second operation drive section 16b is inserted. ing. Furthermore, each of the blades 261b and 261c has a lightening hole 264 for reducing the weight of the blades 261b and 261c. The cam holes 263 of the blades 261a, 261b, 261c have different shapes. Therefore, when the second operation driving portion 16b is driven and the arm portion 164 of the second operation driving portion 16b rotates, the blades 261a, 261b, and 261c move at different speeds around the shutter blade shaft 216b. Rotate. With such a configuration, it is possible to fold the blades 261a, 261b, and 261c in the shutter-off state and unfold the blades 261a, 261b, and 261c in the shutter-on state.

(First operation drive unit 16a and second operation drive unit 16b)
Since each of the first operation driving portion 16a and the second operation driving portion 16b has the same configuration as the operation driving portion 16 used in the blade driving device 1 of the first embodiment described above, the first operation driving portion 16a and the second operation driving portion 16b The details of the configuration of the operation drive section 16a and the second operation drive section 16b are omitted. In the blade drive device 1 of the first embodiment, the arm portion 164 and the drive pin 165 of the operation drive portion 16 have the function of converting the rotational motion of the cylindrical magnet 161 into the sliding motion of the blade member 15. However, in the blade drive device 2 of the present embodiment, the arm portion 164 and the drive pin 165 of the first operation drive portion 16a have a function of converting rotation of the cylindrical magnet 161 into rotation of the blade member 25. The arm portion 164 and the drive pin 165 of the second operation drive portion 16b have the function of converting the rotation of the cylindrical magnet 161 into the rotation of the shutter blades 26. As shown in FIG.

In the blade driving device 2 of the present embodiment, the first steady state of the first operation driving portion 16a is the first state in which the ND filter 253 of the blade member 25 is not positioned above the opening 214 of the base 21. Correspondingly, the second steady state of the first operation driving portion 16 a is configured to correspond to the second state in which the ND filter 253 of the blade member 25 is positioned above the opening 214 of the base 21 . Therefore, by controlling the current supply to the coil 1632 of the first operation driving portion 16a, the blade member 25 is rotated in a desired direction on the base 21, and the state of the blade driving device 2 is changed to the first state. arbitrarily switched between the state and the second state.

Further, in the blade driving device 2 of the present embodiment, the first steady state of the second operation driving section 16b corresponds to the shutter OFF state in which the shutter blade 26 is not positioned above the opening 214 of the base 21, The second steady state of the second operation drive portion 16b is configured to correspond to the shutter ON state in which the shutter blade 26 is positioned above the opening 214 of the base 21. As shown in FIG. Therefore, by controlling the current supply to the coil 1632 of the second operation driving section 16b, the shutter blade 26 is rotated in a desired direction on the base 21, and the state of the blade driving device 2 is changed to the shutter OFF state. and the shutter-on state can be arbitrarily switched. The first operation drive section 16 a and the second operation drive section 16 b are independently controlled and driven by an external device connected to the wiring 241 of the circuit board 24 . Therefore, the blade driving device 2 can independently perform on/off switching of the filter for limiting the amount of light incident on the image sensor and on/off switching of the light incident on the image sensor. 20 to 29, state switching of the blade driving device 2 provided by the cam hole 256 of the blade member 25, the first engaging protrusion 257a, and the second engaging protrusion 257b. Elaborate on prevention.

FIGS. 20, 22, 23, 25, 27, and 28 are plan views of the blade driving device 2 viewed from the +Y direction, and illustrate prevention of state switching of the blade driving device 2. Only the constituent elements necessary for doing so are illustrated, and other constituent elements are omitted. In FIGS. 20 to 29, the rotation trajectory of the drive pin 165 when the arm portion 164 of the first operation drive portion 16a is rotated by driving the first operation drive portion 16a is indicated by a dashed line. ing. 21, 24, 26, and 29 are enlarged views of the area near the cam hole 256 of the blade member 25 shown in FIGS. 20, 23, 25, and 28, respectively.

First, with reference to FIGS. 20 to 24, the operation of blade driving device 2 from the first state will be described in detail. 20 shows the first state of the blade driving device 2. FIG. That is, in the state shown in FIG. 20, the first operation driving section 16a is in the first steady state, and no external force is applied to the blade member 25 due to dropping or vibration of the blade driving device 2. . As shown in FIG. 20, in the first state of the blade driving device 2, the ND filter 253 of the blade member 25 is not positioned above the opening 231 of the first partition plate 23a. Therefore, in the first state of the blade driving device 2, the opening 214 of the base 21 is open.

Further, as shown in FIG. 21, in the first state of the blade driving device 2, the first engaging protrusion 257a formed on the end surface of the cam hole 256 of the blade member 25 is indicated by a dashed line. It is not positioned within the rotation trajectory of the drive pin 165 of the first operation drive portion 16a. Therefore, when the first operation driving portion 16a is driven in the first state of the blade driving device 2 and the arm portion 164 of the first operation driving portion 16a rotates clockwise, the first engagement The mating projecting portion 257a is not positioned within the rotational trajectory of the driving pin 165 of the first operation driving portion 16a. Therefore, the clockwise rotation of the driving pin 165 of the first operation driving portion 16a from the first state of the blade driving device 2 is not restricted by the first engagement protrusion 257a.

When the first operation driving portion 16a is driven in the first state of the blade driving device 2 shown in FIG. 22(a). In the state shown in FIG. 22( a ), the drive pin 165 of the first operation drive portion 16 a abuts the end surface of the cam hole 256 in the +Z direction. When the drive pin 165 of the first operation drive portion 16a rotates further clockwise from the state shown in FIG. 22(b), the blade member 25 is rotated counterclockwise on the base 21 about the shaft 216a. The blade member 25 is rotated counterclockwise about the shaft 216a by the driving pin 165 of the first operation driving portion 16a until the stopper engaging portion 254a of the blade member 25 contacts the stopper 215a of the base 21. be done. When the stopper engaging portion 254a of the blade member 25 comes into contact with the stopper 215a of the base 21, the rotation of the blade member 25 in the counterclockwise direction around the shaft 216a is completed, and the state of the blade driving device 2 is as follows. It switches to the second state shown in FIG. 22(c). In this way, in the first state of the blade driving device 2, the first engagement projection 257a of the blade member 25 is driven by the first operation driving portion 16a to move the arm portion 164 of the first operation driving portion 16a. is configured so as not to be positioned within the rotation track of the drive pin 165 of the first operation drive portion 16a when it starts rotating in the clockwise direction.

Next, in the first state of the blade driving device 1 shown in FIG. 20, the prevention of state switching of the blade driving device 2 when an external force is applied to the blade member 25 due to dropping or vibration of the blade driving device 2 will be described in detail. describe. In the first state of the blade driving device 2 shown in FIG. 20, when an external force is applied to the blade member 25 due to dropping or vibration of the blade driving device 2, the blade member 25 rotates counterclockwise about the shaft 216a. , and the -Z direction end face of the cam hole 256 of the blade member 25 pushes the driving pin 165 of the first operation driving portion 16a in the +Z direction. When the end face of the cam hole 256 of the blade member 25 pushes the drive pin 165 of the first operation drive portion 16a, the drive pin 165 of the first operation drive portion 16a rotates slightly clockwise about the shaft 216a. 23, and the state of the blade driving device 2 changes from the first state to the state shown in FIG.

FIG. 24 is an enlarged view of the area near the cam hole 256 of the blade member 25 shown in FIG. As shown in FIG. 24, the first engaging protrusion 257a formed on the end surface of the cam hole 256 of the blade member 25 is positioned within the rotational trajectory of the driving pin 165 of the first operation driving portion 16a. To position. In this way, when the blade driving device 2 is in the first state, the first engaging projection 257a of the blade member 25 is applied with an external force to the blade member 25 due to falling or vibration of the blade driving device 2, and the blade member 25 of the cam hole 256 is positioned within the rotational track of the drive pin 165 of the first operation drive portion 16a when the drive pin 165 of the first operation drive portion 16a is pushed. there is As shown in FIG. 24, the drive pin 165 of the first operating drive portion 16a engages with the first engagement protrusion 257a of the blade member 25, and the drive pin of the first operating drive portion 16a Further rotation of 165 is restricted. Therefore, even if the external force applied to the blade member 25 due to dropping or vibration of the blade driving device 2 exceeds the holding force of the first operation driving unit 16a for the cylindrical magnet 161 in the first steady state, The amount of rotation of the cylindrical magnet 161 of the first operation drive section 16a due to the external force is suppressed to a small amount, and the first operation drive section 16a is switched from the first steady state to the second steady state. no. Therefore, the state of the blade driving device 2 is unintentionally switched from the first state to the second state due to a factor other than the driving of the first operation driving section 16a, such as dropping or vibration of the blade driving device 2. can be prevented.

Further, the driving pin 165 of the first operation driving portion 16a engages with the first engagement protrusion 257a of the blade member 25, and further rotation of the driving pin 165 of the first operation driving portion 16a is restricted. After that, the external force applied to the blade member 25 is released. When the external force applied to the blade member 25 is released, the magnetic force between the cylindrical magnet 161 of the first operation driving portion 16a and the arc portions 1623a and 1623b of the yoke 162 causes the cylindrical magnet 161 to move to the first position. 1, and the first operating drive 16a returns to the first steady state. As a result, the blade driving device 2 can return to the first state even after an external force due to dropping, vibration, or the like of the blade driving device 2 is applied.

Next, the operation of the blade driving device 2 from the second state will be described in detail with reference to FIGS. 25 to 29. FIG. 25 shows the second state of the blade driving device 2. FIG. That is, in the state shown in FIG. 25, the first operation driving portion 16a is in the second steady state, and no external force is applied to the blade member 25 due to falling or vibration of the blade driving device 2. .

As shown in FIG. 25, in the second state of the blade driving device 1, the ND filter 253 of the blade member 25 is positioned above the opening 231 of the first partition plate 23a. Since the opening 231 of the first partition plate 23a is formed at a position corresponding to the opening 214 of the base 21, in the second state of the blade driving device 2, the ND filter 253 of the blade member 25 is positioned at the base 21 over opening 214 .

Further, as shown in FIG. 26, in the second state of the blade driving device 2, the second engaging protrusion 257b formed on the end surface of the cam hole 256 of the blade member 25 is indicated by a dashed line. It is not positioned within the rotation trajectory of the drive pin 165 of the first operation drive portion 16a. Therefore, when the first operation driving portion 16a is driven in the second state of the blade driving device 2 and the arm portion 164 of the first operation driving portion 16a rotates in the counterclockwise direction, the second The engagement protrusion 257b is not positioned within the rotational locus of the drive pin 165 of the first operation drive portion 16a. Therefore, the counterclockwise rotation of the driving pin 165 of the first operation driving portion 16a from the second state of the blade driving device 2 is not restricted by the second engagement protrusion 257b.

When the first operation driving portion 16a is driven in the second state of the blade driving device 2 shown in FIG. It rotates, and the blade driving device 2 is in the state shown in FIG. 27(a). In the state shown in FIG. 27(a), the drive pin 165 of the first operation drive portion 16a contacts the end surface of the cam hole 256 in the -Z direction. When the drive pin 165 of the first operation drive portion 16a rotates further counterclockwise from the state shown in FIG. The end face in the -Z direction is pushed in the -Z direction, and as shown in FIG. 27B, the blade member 25 is rotated clockwise about the shaft 216a on the base 21. As shown in FIG. The blade member 25 is rotated clockwise about the shaft 216a by the drive pin 165 of the first operation drive portion 16a until the stopper engaging portion 254b of the blade member 25 contacts the stopper 215b of the base 21. . When the stopper engaging portion 254b of the blade member 25 comes into contact with the stopper 215b of the base 21, the rotation of the blade member 25 in the clockwise direction about the shaft 216a is completed, and the state of the blade driving device 2 is as shown in FIG. It switches to the first state shown in 27(c). In this way, in the second state of the blade driving device 2, the second engagement projection 257b of the blade member 25 is driven by the first operation driving portion 16a to move the arm portion 164 of the first operation driving portion 16a. is configured so as not to be positioned within the rotation track of the drive pin 165 of the first operation drive portion 16a when it starts to rotate in the counterclockwise direction.

Next, in the second state of the blade driving device 2 shown in FIG. 25, the prevention of state switching of the blade driving device 2 when an external force is applied to the blade member 25 due to dropping or vibration of the blade driving device 2 will be described in detail. describe. In the second state of the blade driving device 2 shown in FIG. 25, when an external force is applied to the blade member 25 due to falling or vibration of the blade driving device 2, the blade member 25 moves clockwise about the shaft 216a. It rotates, and the +Z direction end surface of the cam hole 256 of the blade member 25 pushes the driving pin 165 of the first operation driving portion 16a in the -Z direction. When the end surface of the cam hole 256 of the blade member 25 pushes the drive pin 165 of the first operation drive portion 16a, the drive pin 165 of the first operation drive portion 16a slightly moves counterclockwise about the shaft 216a. It rotates (for example, rotates about 2 degrees), and the state of the blade driving device 2 changes from the second state to the state shown in FIG.

FIG. 29 is an enlarged view of the area near the cam hole 256 of the blade member 25 shown in FIG. As shown in FIG. 29, the second engaging projection 257b formed on the end surface of the cam hole 256 of the blade member 25 is positioned within the rotational trajectory of the driving pin 165 of the first operation driving portion 16a. To position. In this way, when the blade driving device 2 is in the second state, the second engaging projection 257b of the blade member 25 is applied with an external force to the blade member 25 due to falling or vibration of the blade driving device 2, and the blade member 25 of the cam hole 256 is positioned within the rotational track of the drive pin 165 of the first operation drive portion 16a when the drive pin 165 of the first operation drive portion 16a is pushed. there is The drive pin 165 of the first operation drive portion 16a engages with the second engaging protrusion 257b of the blade member 25, and further rotation of the drive pin 165 of the first operation drive portion 16a is restricted. be. Therefore, even if the external force applied to the blade member 25 due to dropping or vibration of the blade driving device 2 exceeds the holding force of the first operation driving unit 16a for the cylindrical magnet 161 in the second steady state, The amount of rotation of the cylindrical magnet 161 of the first operation drive section 16a due to the external force is suppressed to a small amount, and the first operation drive section 16a switches from the second steady state to the first steady state. no. Therefore, the state of the blade driving device 2 is unintentionally switched from the second state to the first state due to a factor other than the driving of the first operation driving section 16a, such as dropping or vibration of the blade driving device 2. can be prevented.

Further, the driving pin 165 of the first operation driving portion 16a is engaged with the second engagement protrusion 257b of the blade member 25, and further rotation of the driving pin 165 of the first operation driving portion 16a is restricted. After that, the external force applied to the blade member 25 is released. When the external force applied to the blade member 25 is released, the magnetic force between the cylindrical magnet 161 of the first operation driving portion 16a and the arc portions 1623a and 1623b of the yoke 162 causes the cylindrical magnet 161 to move to the first position. 2, and the first operation drive section 16a returns to the second steady state. As a result, the blade driving device 2 can return to the second state even after an external force due to dropping or vibration of the blade driving device 2 is applied.

Like the blade driving device 1 of the first embodiment, the blade driving device 2 of the present embodiment has the cam hole 256, the first engaging projection 257a, and the first engaging projection 257b as described above. By using the blade member 25 including the blade driving device 2, the state of the blade driving device 2 can be changed between the first state and the second state by a factor other than the driving of the first operation driving section 16a such as dropping or vibration of the blade driving device 2. It is possible to prevent unintentional switching between

In addition, in the illustrated embodiment, two engaging protrusions 257a and 257b are formed inside the cam hole 256 of the blade member 25, but the present invention is not limited to this. A mode in which only one of the engaging protrusions 257a and 257b is formed inside the cam hole 256 of the blade member 25 is also within the scope of the present invention. For example, FIG. 30 shows a modified example of the blade member 15. As shown in FIG. In the modified example of the blade member 25 shown in FIG. 30, the second engaging protrusion 257b is omitted. When the modified example of the blade member 25 as shown in FIG. 32 is used, the first operation of the blade driving device 2 due to a factor other than the driving of the first operation driving section 16a, such as dropping or vibration of the blade driving device 2, occurs. Switching from the state to the second state is prevented by the first engaging protrusion 257a.

Next, with reference to FIG. 31, an imaging device provided with the blade driving device 2 of the second embodiment will be described in detail. An imaging device 200 shown in FIG. 31 is a digital camera such as a compact digital camera. The imaging apparatus 200 includes a housing 210, a control unit (not shown) such as a CPU and a microcomputer provided in the housing 210, and an imaging optical system configured by a plurality of optical elements such as lenses held by the housing 210. 220 , an imaging device (not shown) arranged in the housing 210 for capturing an optical image formed by the imaging optical system 220 , and the above-described first imaging device provided between the imaging device and the imaging optical system 220 . and a blade driving device 2 of two embodiments.

Within the housing 210, the blade driving device 2 is fixedly held so that the opening 214 of the base 21 is positioned in front of the imaging surface of the imaging device. Also, the control section of the imaging device 200 is connected to the wiring 241 of the circuit board 24 of the blade driving device 2 . The control unit of the imaging device 200 independently controls and drives the first operation driving unit 16a and the second operation driving unit 16b. Therefore, the imaging device 200 uses the blade driving device 2 to independently switch on/off the filter for limiting the amount of light incident on the imaging device and to switch on/off the incidence of light to the imaging device. can be executed.

Although one embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and may be embodied in various forms within the technical scope of the invention. Each configuration of the present invention can be replaced with any one capable of exhibiting a similar function, or any configuration can be added to each configuration of the present invention.

Also, the number and types of components of the blade driving devices of the first embodiment and the second embodiment are merely examples for explanation, and the present invention is not necessarily limited to these. Aspects in which any component is added or combined, or any component is deleted without departing from the principle and intent of the present invention are also within the scope of the present invention. For example, any component of the blade drive devices of the first embodiment and the second embodiment can be combined.

Further, although the blade member has the transparent glass plate and the infrared cut filter in the first embodiment and the blade member has the ND filter in the second embodiment, the present invention is not limited to this. The blade member includes an infrared filter for cutting infrared rays, various types of optical filters such as an arbitrary number of infrared cut filters, a shutter member for blocking light, and any type of glass plate, and these Such embodiments having combinations are also within the scope of the invention. Further, the vane member may include an aperture member having an opening with a smaller diameter than the opening of the base member.

It should be noted that the terms “lower”, “upper”, “bottom”, “upper”, “lower”, “upper”, “lower” and other terms indicating positional relationships used in this specification are It is used in the context of form, which varies with the relative positions of the devices.

Although the preferred embodiments of the present invention have been described so far, it goes without saying that the present invention is not limited to the above-described embodiments and may be embodied in various forms within the scope of its technical concept.

1 blade driving device 11 base 12 cover plate 15 blade member 151 body portion 152a first opening 152b second opening 153a transparent glass plate 153b infrared cut filter 154a extending portion 154b extending portion 156 stopper engagement portion 157 cam hole 158a first cam hole engaging protrusion 158b second engaging protrusion 16 operation driving portion 16a first operation driving portion 16b second operation driving portion 161 magnet 162 yoke 1621a extending portion 1621b extending portion 1622 connecting portion 1623a arc portion 1623b arc portion 1624 edge portion 163 coil assembly 1631 coil bobbin 1632 coil 1633 flange portion 164 arm portion 165 drive pin 100 imaging device 2 blade driving device 21 base 25 blade member 251 body portion 252 opening 253 ND filter 254a stopper engaging portion 254b stopper engaging portion 255 Shaft insertion hole 256 Cam hole 257a First engagement protrusion 257b Second engagement protrusion 200 Imaging device

Claims (9)

a base having an opening;
a vane member driven to change the position of the base with respect to the opening;
an operation drive unit for driving the blade member on the base,
The operation drive section includes an arm section configured to be rotatable about a predetermined axis, and a drive pin provided at the tip of the arm section,
The blade member includes a cam hole for inserting the drive pin of the operation drive unit, and an engaging protrusion formed to protrude from the inside of the cam hole,
When the driving pin of the operation driving portion pushes the end surface of the cam hole of the blade member to drive the blade member, the engaging protrusion of the blade member is connected to the driving pin of the operation driving portion. Further, when the end face of the cam hole of the blade member pushes the drive pin of the operation drive portion, the blade member engages with the drive pin of the operation drive portion to drive the blade member. A vane drive configured to regulate. When the arm portion of the operation driving portion starts to rotate due to the driving of the operation driving portion, the engaging protrusion of the blade member is positioned within the rotation trajectory of the driving pin of the operation driving portion. Further, when the end surface of the cam hole of the blade member pushes the drive pin of the operation drive section, the drive pin of the operation drive section is positioned within the rotation locus. 2. The vane drive of claim 1, wherein the vane drive is configured. The operation driving section is provided integrally with the base end portion of the arm section and includes a cylindrical magnet provided rotatably about the predetermined axis, a pair of extension sections, and a pair of extension sections. and a connecting portion connecting the pair of extending portions, and the arc portions of the pair of extending portions are arranged so as to face the peripheral surface of the cylindrical magnet. and a coil provided to surround one of the pair of extending portions of the yoke,
The operation drive unit is in a steady state in which the cylindrical magnet does not freely rotate due to the magnetic force between the cylindrical magnet and the arc portion of the yoke in a non-energized state in which current is not supplied to the coil. 3. The blade driving device according to claim 1 or 2, which is configured to be able to implement When the end surface of the cam hole of the blade member pushes the drive pin of the operation drive section, the state of the operation drive section changes from the steady state,
In the operation driving portion, the engaging protrusion of the blade member engages with the driving pin of the operation driving portion to regulate the driving of the blade member, and then the circular arc of the cylindrical magnet and the yoke is controlled. 4. The blade driving device according to claim 3, wherein the magnetic force between the blades and the blades causes the blades to return to the steady state. the vane member includes a filter for covering the opening of the base;
The operation drive unit has a first state in which the filter of the blade member is not positioned over the opening of the base, and a second state in which the filter of the blade member is positioned over the opening of the base. 5. The blade driving device according to any one of claims 1 to 4, configured to drive the blade member on the base in order to switch between and. In the first state, the engaging protrusion of the blade member is adapted to engage the drive pin of the operation drive unit when the end face of the cam hole of the blade member pushes the drive pin of the operation drive unit. a first engaging protrusion that engages with a pin; and when the end face of the cam hole of the blade member pushes the drive pin of the operation drive section in the second state, the operation drive section and a second engagement projection that engages the drive pin. The blade member further includes a transparent glass plate arranged in line with the filter in a uniaxial direction,
The operation driving unit is configured to operate in the first state in which the filter is not positioned over the opening of the base and the transparent glass plate is positioned over the opening of the base, and the filter is positioned over the opening of the base. 7. A vane drive device according to claim 5 or 6, configured to slide said vane member on said base to switch between said second state located over said opening of said vane member. The blade drive according to claim 5 or 6, wherein the operation drive section is configured to rotate the blade member on the base in order to switch between the first state and the second state. Device. An imaging device comprising the blade driving device according to any one of claims 1 to 8.

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