Image sensor protection device and image pickup device

Abstract

An image sensor protection device capable of protecting an image sensor with a compact configuration [Solution] The imaging element protection device includes a base portion having an opening extending along a first direction and a second direction perpendicular to the first direction, a blade arm rotatable about a rotation axis, and a blade connected to the blade arm and movable along the first direction as the blade arm rotates. The blade includes a shielding portion extending along the second direction. The imaging element protection device also includes an actuator including a motor and a movable portion movable along a third direction as driven by the motor, a motion conversion mechanism that converts movement of the movable portion into rotation of the blade arm, and a control unit that, by driving the motor to move the blade, can switch between an open state in which the shielding portion is positioned outside the opening and a shielded state in which at least a portion of the shielding portion is positioned within the opening.

Description

[Technical Field]

[0001] The present invention relates to an imaging element protection device and an imaging device. [Background technology]

[0002] Conventionally, imaging devices such as cameras have exposed an image sensor by driving a physical shutter, but in recent years, devices that electronically perform the exposure process for the image sensor (electronic shutters) have been developed (see, for example, Patent Document 1). However, with electronic shutters, there is no physical shutter in front of the image sensor, so dust and dirt inside the camera are likely to adhere to the image sensor. If such dust and dirt adheres to the image sensor, the quality of the captured image will deteriorate. Meanwhile, there has been a demand in recent years for further miniaturization of cameras, and there is a demand for the components built into cameras to be as compact as possible. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-30059 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made in view of the above problems of the conventional technology, and has an object to provide an imaging element protection device and an imaging device that can protect an imaging element with a compact configuration. [Means for solving the problem]

[0005] According to a first aspect of the present invention, there is provided an imaging element protection device capable of protecting an imaging element with a compact configuration. The imaging element protection device is disposed in proximity to an imaging element. The imaging element protection device includes: a base portion having an opening extending along a first direction and a second direction perpendicular to the first direction; a blade arm rotatable about a rotation axis; and a blade connected to the blade arm and movable along the first direction as the blade arm rotates. The blade includes a shielding portion extending along the second direction. The imaging element protection device includes: an actuator including a motor and a movable portion movable along a third direction by driving the motor; a motion conversion mechanism that converts movement of the movable portion into rotation of the blade arm; and a control unit that, by driving the motor to move the blade, can switch between an open state in which the shielding portion is positioned outside the opening and a shielded state in which at least a portion of the shielding portion is positioned within the opening.

[0006] According to a second aspect of the present invention, there is provided an imaging device including an optical system, an imaging element disposed on a plane where light passing through the optical system forms an image, and the imaging element protection device described above, wherein the imaging element protection device is disposed between the optical system and the imaging element. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a conceptual diagram showing an imaging device according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing an imaging element protection device according to one embodiment of the present invention. [Figure 3] FIG. 3 is an exploded perspective view of the imaging element protection device shown in FIG. [Figure 4] FIG. 4 is an exploded perspective view of the blade and blade arm shown in FIG. [Figure 5] FIG. 5 is a perspective view of an actuator in the imaging element protection device shown in FIG. [Figure 6] FIG. 6 is an exploded perspective view of the imaging element protection device shown in FIG. [Figure 7A]FIG. 7A is a front view schematically showing the relationship between the slide lever and the rotary lever of the imaging element protection device in the open state. [Figure 7B] FIG. 7B is a front view schematically showing the relationship between the rotating lever and the blades of the imaging element protection device in the open state. [Figure 8A] FIG. 8A is a front view schematically showing the relationship between the slide lever and the rotation lever of the imaging element protection device in the shielded state. [Figure 8B] FIG. 8B is a front view schematically showing the relationship between the rotating lever and the blades of the imaging element protection device in the shielded state. [Figure 9] FIG. 9 is a conceptual diagram showing a rotational position detection unit in another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of an imaging element protection device according to the present invention will be described in detail with reference to FIGS. 1 to 9. In FIGS. 1 to 9, identical or corresponding components are denoted by the same reference numerals, and redundant description will be omitted. In addition, in FIGS. 1 to 9, the scale and dimensions of each component may be exaggerated, or some components may be omitted. In the following description, unless otherwise specified, terms such as "first" and "second" are used merely to distinguish components from one another, and do not represent a specific order or ranking.

[0009] FIG. 1 is a conceptual diagram showing an imaging device 1 according to one embodiment of the present invention. As shown in FIG. 1, the imaging device 1 according to this embodiment includes an optical system 2 including optical elements such as lenses, an imaging element 3 disposed on a plane where light passing through the optical system 2 forms an image, and an imaging element protection device 4 disposed between the optical system 2 and the imaging element 3. The imaging element protection device 4 is disposed close to the imaging element 3 and has an opening 5 formed therein that allows light from the optical system 2 to pass through. For example, when an image is being captured using the imaging element 3 or when the imaging device 1 is turned on, the imaging element protection device 4 opens the opening 5 to allow light from the optical system 2 to form an image on the imaging element 3, and when an image is not being captured using the imaging element 3 or when the imaging device 1 is turned off, the imaging element protection device 4 covers the opening 5 to protect the imaging element 3 from dust and dirt inside the imaging device 1 from adhering to the imaging element 3.

[0010] Fig. 2 is a perspective view showing the imaging element protection device 4, and Fig. 3 is an exploded perspective view of the imaging element protection device 4. As shown in Figs. 2 and 3, the imaging element protection device 4 includes a substantially rectangular base portion 10, a cover plate 20 covering the +Z direction side of the base portion 10, four blades 31, 32, 33, and 34 arranged in a blade chamber between the base portion 10 and the cover plate 20, a blade arm 41 attached to a shaft portion 11 rotatably provided with respect to the base portion 10, a blade arm 42 rotatably attached to a support shaft 12 provided on the base portion 10, an actuator 50 attached to the -Z direction side of the base portion 10, and a control unit 60 that controls the operations of various components within the imaging device 1. The control unit 60 may be located separately from the main components of the imaging element protection device 4, or may be integrated into the control unit of the imaging device 1, for example.

[0011] As shown in Fig. 2, an auxiliary plate 14 is attached to the base portion 10 on the side opposite the cover plate 20 with screws 91 and 92, and the actuator 50 is fixed to the auxiliary plate 14 with a screw 93. Also, as shown in Fig. 3, an arc groove 16 is formed in the base portion 10 along an arc centered on the shaft portion 11. A shock absorbing damper 17 is provided at the end of the arc groove 16 of the base portion 10 on the +Y direction side.

[0012] A rectangular opening 13 extending along the Y and X directions is formed in the base portion 10, and similarly, a rectangular opening 23 extending along the Y and X directions is formed in the cover plate 20. These openings 13, 23 constitute the opening 5 of the imaging element protection device 4 described above.

[0013] Fig. 4 is an exploded perspective view of the blades 31 to 34 and the blade arms 41, 42. As shown in Fig. 4, each of the blades 31 to 34 is a thin plate-like member extending in the X direction as a whole, and the four blades 31 to 34 are stacked in order in the -Z direction. The blade arm 41 is formed with four pin holes 411, a shaft hole 412 into which the shaft portion 11 of the base portion 10 is press-fitted, and a pin hole 413 formed near the shaft hole 412. The blade arm 42 is formed with four pin holes 421 and a shaft hole 422 into which the support shaft 12 of the base portion 10 is inserted.

[0014] The blade 31 has an attachment portion 311 attached to the blade arms 41 and 42, and a shielding portion 312 extending in the +X direction from the attachment portion 311. Two pin holes 313 are formed in the attachment portion 311. The blade 31 is rotatably connected to the blade arm 41 by attaching a pin (not shown) to one of the pin holes 313 and the pin hole 411 of the blade arm 41, and is rotatably connected to the blade arm 42 by attaching a pin (not shown) to the other of the pin hole 313 and the pin hole 421 of the blade arm 42.

[0015] The blade 32 has an attachment portion 321 attached to the blade arms 41, 42, and a shielding portion 322 extending in the +X direction from the attachment portion 321. Two pin holes 323 are formed in the attachment portion 321. The blade 32 is rotatably connected to the blade arm 41 by attaching a pin (not shown) to one of the pin holes 323 and the pin hole 411 of the blade arm 41, and is rotatably connected to the blade arm 42 by attaching a pin (not shown) to the other of the pin hole 323 and the pin hole 421 of the blade arm 42.

[0016] The blade 33 has an attachment portion 331 attached to the blade arms 41 and 42, and a shielding portion 332 extending in the +X direction from the attachment portion 331. Two pin holes 333 are formed in the attachment portion 331. The blade 33 is rotatably connected to the blade arm 41 by attaching a pin (not shown) to one of the pin holes 333 and the pin hole 411 of the blade arm 41, and is rotatably connected to the blade arm 42 by attaching a pin (not shown) to the other of the pin hole 333 and the pin hole 421 of the blade arm 42.

[0017] The blade 34 has an attachment portion 341 attached to the blade arms 41, 42, and a shielding portion 342 extending in the +X direction from the attachment portion 341. Two pin holes 343 are formed in the attachment portion 341. The blade 34 is rotatably connected to the blade arm 41 by attaching a pin (not shown) to one of the pin holes 343 and the pin hole 411 of the blade arm 41, and is rotatably connected to the blade arm 42 by attaching a pin (not shown) to the other of the pin hole 343 and the pin hole 421 of the blade arm 42.

[0018] The shaft 11 of the base unit 10 is press-fitted into the shaft hole 412 of the blade arm 41, and the blade arm 41 is rotatable together with the shaft 11 relative to the base unit 10. In this specification, the center of rotation of the blade arm 41 (the central axis of the shaft 11) is defined as the "rotation axis." Furthermore, the support shaft 12 of the base unit 10 is inserted into the shaft hole 422 of the blade arm 42, and the blade arm 42 is rotatable around the support shaft 12.

[0019] In this way, a link mechanism is formed by the blades 31 to 34 and the blade arms 41, 42. That is, when the blade arm 41 rotates around the rotation axis together with the shaft 11 and the blade arm 42 rotates around the support shaft 12, the link mechanism causes the blades 31 to 34 to move mainly in the Y direction while changing the overlapping areas.

[0020] 2 shows a state when, for example, imaging is being performed using the imaging element 3 (see FIG. 1) or when the imaging device 1 is powered on. In this state, the shielding portions 312, 322, 332, and 342 of the blades 31-34 are positioned outside (on the -Y direction side) of the opening 5 of the imaging element protection device 4, and the opening 5 is open. This state is referred to as the open state. As will be described later, by moving the blades 31-34 in the +Y direction from this open state, at least a portion of each of the shielding portions 312, 322, 332, and 342 of the blades 31-34 can be positioned inside the opening 5 of the imaging element protection device 4, and the opening 5 can be shielded by these shielding portions 312, 322, 332, and 342. This state is referred to as the shielded state. In this embodiment, the Y direction in which blades 31 to 34 mainly move is defined as a "first direction," and the X direction in which shielding portions 312, 322, 332, 342 of blades 31 to 34 extend is defined as a "second direction" perpendicular to the first direction.

[0021] FIG. 5 is a perspective view of the actuator 50. As shown in FIG. 5, the actuator 50 includes a frame 51 fixed to the auxiliary plate 14 (see FIG. 2) with screws 93, a screw shaft 52 rotatably supported by the frame 51 and extending in the Y direction, a guide rail 53 extending parallel to the screw shaft 52, a nut 54 movable in the Y direction on the screw shaft 52 and the guide rail 53, a stepping motor 55, and a gearbox 56 accommodating a planetary gear that reduces the rotation of the output shaft of the stepping motor 55 and transmits it to the screw shaft 52. The nut 54 has a protrusion 57 protruding in the +Z direction. The stepping motor 55 has a terminal 55A connected to a control unit 60 via, for example, a flexible circuit board or the like, and is driven by commands from the control unit 60.

[0022] Although not shown in FIG. 5 , the screw shaft 52 has a screw thread formed thereon, and the nut 54 has a screw hole 58 that screws onto the screw shaft 52. The nut 54 also has a guide hole 59 into which the guide rail 53 is inserted. In this manner, the nut 54, the screw shaft 52, and the guide rail 53 form a ball screw that converts the rotational motion of the screw shaft 52 into linear motion of the nut 54 along the Y direction. Therefore, the control unit 60 can drive the stepping motor 55 to rotate the screw shaft 52 and move the nut 54 in the Y direction. In this manner, the nut 54 in this embodiment functions as a movable part that can move along the Y direction by driving the stepping motor 55. In this embodiment, the Y direction, which is the direction in which the nut 54 as a movable part moves, is defined as the "third direction."

[0023] Fig. 6 is an exploded perspective view of the imaging element protection device 4 from a different angle. As shown in Fig. 6, a slide lever 70 that is movable in the Y direction, a rotary lever 80 that rotates together with the shaft portion 11, and a rotary plate 100 are housed in the space formed between the auxiliary plate 14 and the base portion 10. In this embodiment, the rotary plate 100 has two light-shielding portions 101 that extend radially outward.

[0024] 6, the slide lever 70 is formed with a slide groove 71 extending in the Y direction, a nut groove 72 into which the protrusion 57 of the nut 54 of the actuator 50 fits, and an engagement groove 73 extending in the X direction. The width of the slide groove 71 in the X direction is slightly larger than the diameter of the screw mounting portions 15 of the base portion 10 to which the screws 92 that secure the auxiliary plate 14 are attached, so that the slide lever 70 can move in the Y direction while engaging with the two screw mounting portions 15 in the X direction. The protrusion 57 of the nut 54 fits into the nut groove 72 of the slide lever 70, connecting the slide lever 70 and the nut 54 to each other. Therefore, when the nut 54 moves in the Y direction due to the driving of the stepping motor 55 as described above, the slide lever 70 moves in the Y direction together with the nut 54.

[0025] The rotating lever 80 has a first connecting pin 81 (first connecting portion) that protrudes in the +Z direction and a second connecting pin 82 (second connecting portion) that protrudes in the +Z direction of the base portion 10 through the arc groove 16 of the base portion 10. The first connecting pin 81 is located radially outward from the rotation axis relative to the second connecting pin 82. The first connecting pin 81 is located within the engagement groove 73 of the slide lever 70. The width of the engagement groove 73 of the slide lever 70 in the Y direction is slightly larger than the outer diameter of the first connecting pin 81. In this manner, the rotating lever 80 and the slide lever 70 are connected to each other by the first connecting pin 81 and the engagement groove 73. Therefore, when the slide lever 70 moves in the Y direction, the first connecting pin 81 engages with the engagement groove 73 of the slide lever 70 in the Y direction, causing the rotating lever 80 to rotate about the rotation axis (shaft portion 11).

[0026] 3, the second connecting pin 82 of the rotating lever 80 passes through the arc groove 16 of the base portion 10 and fits snugly into the pin hole 413 of the blade arm 41. Both the rotating lever 80 and the blade arm 41 rotate about the rotation axis (shaft portion 11), so when the rotating lever 80 rotates about the rotation axis due to the movement of the slide lever 70 in the Y direction as described above, the blade arm 41 also rotates about the rotation axis. As a result, via the link mechanism formed by the blade arms 41, 42 and the blades 31 to 34 described above, the blades 31 to 34 move mainly in the Y direction while changing the overlapping areas with each other.

[0027] Fig. 7A is a front view schematically showing the relationship between the slide lever 70 and the rotary lever 80 in the open state, and Fig. 7B is a front view schematically showing the relationship between the rotary lever 80 and the blades 31 to 34. Fig. 8A is a front view schematically showing the relationship between the slide lever 70 and the rotary lever 80 in the closed state, and Fig. 8B is a front view schematically showing the relationship between the rotary lever 80 and the blades 31 to 34 in the closed state.

[0028] 7A and 7B, when the control unit 60 drives the stepping motor 55 of the actuator 50, the screw shaft 52 rotates and the nut 54 moves in the +Y direction. Because the slide lever 70 is connected to the protrusion 57 of the nut 54 at the nut groove 72, when the nut 54 moves in the +Y direction, the slide lever 70 moves in the +Y direction. Because the rotating lever 80 is connected to the engagement groove 73 of the slide lever 70 at the first connecting pin 81, when the slide lever 70 moves in the +Y direction, the rotating lever 80 rotates clockwise in FIG. 7A around the rotation axis (shaft 11).

[0029] When rotary lever 80 rotates clockwise, blade arm 41 attached to shaft 11 also rotates clockwise in Fig. 7B. As a result, via the link mechanism of blade arms 41, 42 and blades 31 to 34, blades 31 to 34 move mainly in the +Y direction while changing the overlapping areas, and finally, as shown in Fig. 8B, at least a part of each of shielding portions 312, 322, 332, and 342 of blades 31 to 34 moves into opening 5, and opening 5 is shielded by shielding portions 312, 322, 332, and 342, entering a shielded state.

[0030] In this way, by driving the actuator 50 to move the blades 31-34, the control unit 60 can switch between an open state in which the shielding portions 312, 322, 332, and 342 of the blades 31-34 are positioned outside the opening 5 and a shielded state in which at least a portion of each of the shielding portions 312, 322, 332, and 342 is positioned within the opening 5. Therefore, for example, when an image is being captured by the image sensor 3 or when the image capture device 1 is powered on, the opening 5 can be opened in the open state so that light from the optical system 2 forms an image on the image sensor 3. When an image is not being captured by the image sensor 3 or when the image capture device 1 is powered off, the opening 5 is prevented from being unintentionally opened, and the opening 5 is closed in the shielded state so that the image sensor 3 is protected from dust and dirt inside the image capture device 1. In this way, the image sensor protection device 4 of this embodiment can protect the image sensor 3 with a compact configuration and reduce degradation of image data and noise generation.

[0031] The slide lever 70 and the rotating lever 80 in this embodiment function as a motion conversion mechanism that converts the movement of the nut 54 of the actuator 50 into the rotation of the blade arm 41. Such a motion conversion mechanism may be any mechanism that can convert the movement of the nut 54 of the actuator 50 into the rotation of the blade arm 41. For example, the movement of the nut 54 of the actuator 50 may be converted into the rotation of the blade arm 41 by directly engaging the nut 54 of the actuator 50 with the blade arm 41 without using the slide lever 70 or the rotating lever 80.

[0032] In this embodiment, as shown in FIG. 7A, a light detection unit 110 is provided adjacent to the shaft portion 11. This light detection unit 110 includes a light-emitting element and a light-receiving element that receives light emitted from the light-emitting element, and is connected to the control unit 60 (see FIG. 2). In this embodiment, the light detection unit 110 and the rotating plate 100 form a rotational position detection unit that detects the rotational position of the blade arm 41. The light-emitting element and the light-receiving element of the light detection unit 110 are spaced apart in a direction perpendicular to the plane of the drawing, and when the rotating plate 100 rotates, the light-shielding portion 101 of the rotating plate 100 passes between the light-emitting element and the light-receiving element. Therefore, when the rotating plate 100 rotates together with the blade arm 41 and the light-shielding portion 101 is positioned between the light-emitting element and the light-receiving element, the light emitted from the light-emitting element is blocked by the light-shielding portion 101 of the rotating plate 100, and the output of the light-receiving element changes. When the rotating plate 100 further rotates and the light-shielding portion 101 retreats from between the light-emitting element and the light-receiving element, the light emitted from the light-emitting element is again incident on the light-receiving element, causing a change in the output of the light-receiving element. By detecting this change in the output of the light-receiving element, the rotational position of the blade arm 41 can be detected. In the example shown in FIG. 7A, two light-shielding portions 101 are provided, but one or more such light-shielding portions 101 may be provided.

[0033] Here, the control unit 60 may control the driving of the stepping motor 55 based on the rotational position of the blade arm 41 detected by the light detection unit 110. By controlling the driving of the stepping motor 55 based on the rotational position of the blade arm 41 in this way, it is possible to adjust the movement speed and movement distance of the blades 31 to 34 according to the positions of the blades 31 to 34.

[0034] Instead of the rotational position detector of this embodiment, a rotational position detector as shown in FIG. 9 may be used. This rotational position detector includes a magnet 121 arranged on the rotation lever 80 and a magnetic sensor 123 connected to the control unit 60 via a flexible wiring board 122 attached to the auxiliary plate 14. The magnet 121 is arranged near the shaft 11, and the magnetic sensor 123 is located on an extension of the central axis (rotation axis) of the shaft 11. A magnetic sensor such as a Hall element or TMR sensor can be used as this magnetic sensor 123. By using this magnetic sensor 123 to detect changes in the magnetic field caused by the movement of the magnet 121 on the rotation lever 80, the rotational positions of the rotation lever 80 and the blade arm 41 can be detected.

[0035] In this embodiment, the first direction in which the blades 31 to 34 primarily move and the third direction in which the nut 54 as a movable part moves are both the Y direction, but the first direction in which the blades 31 to 34 primarily move and the third direction in which the nut 54 as a movable part moves may be different.

[0036] In the above example, four blades 31-34 are provided, but the number of blades is not limited to this. For example, it is also possible to cover opening 5 with only one blade. Furthermore, each of blades 31-34 may be formed from a flexible material or a rigid material. However, if blades 31-34 are formed from a rigid material, deformation of blades 31-34 can be suppressed, and if a user drops an object inside imaging device 1, blades 31-34 can prevent the dropped object from coming into contact with imaging element 3.

[0037] As described above, the imaging element protection device according to the present invention can employ the following configuration. [Configuration 1] An imaging element protection device disposed adjacent to an imaging element, a base portion provided with an opening extending along a first direction and a second direction perpendicular to the first direction; a blade arm that is rotatable around a rotation axis; a blade connected to the blade arm and movable along the first direction in accordance with rotation of the blade arm, the blade including a shielding portion extending along the second direction; an actuator including a motor and a movable part that is movable along a third direction by being driven by the motor; a motion conversion mechanism that converts the movement of the movable part into rotation of the blade arm; a control unit that can switch between an open state in which the shielding unit is positioned outside the opening and a closed state in which at least a part of the shielding unit is positioned inside the opening by driving the motor to move the blades; Equipped with Image sensor protection device.

[0038] [Configuration 2] The actuator is a screw shaft extending along the third direction and rotated by the motor; a nut as the movable part that is screwed onto the screw shaft; further comprising: 2. The imaging element protection device according to claim 1.

[0039] [Configuration 3] The motion conversion mechanism is a slide lever movable along the third direction and coupled to the movable portion; a rotary lever rotatable about the rotation axis, the rotary lever having a first connecting portion connected to the slide lever and a second connecting portion connected to the blade arm; Including, 3. The imaging element protection device according to configuration 1 or 2.

[0040] [Configuration 4] a rotation position detection unit that detects the rotation position of the blade arm; the control unit controls driving of the motor based on the rotational position of the blade arm detected by the rotational position detection unit. 4. The imaging element protection device according to any one of configurations 1 to 3.

[0041] [Configuration 5] The rotation position detection unit a light detection unit including a light emitting element and a light receiving element that receives light emitted from the light emitting element; a rotating plate that rotates together with the blade arm and has one or more light-shielding portions that pass between the light-emitting element and the light-receiving element; Including, 5. The imaging element protection device according to configuration 4.

[0042] [Configuration 6] The rotation position detection unit a magnet that rotates together with the blade arm about the rotation axis; a magnetic sensor disposed on the rotation shaft; Including, 5. The imaging element protection device according to configuration 4.

[0043] [Configuration 7] The third direction is the same as the first direction. 7. The imaging element protection device according to any one of configurations 1 to 6.

[0044] The imaging device according to the present invention may also have the following configuration. [Configuration 8] An optical system; an image sensor disposed on a plane where light passing through the optical system forms an image; 8. The imaging element protection device according to any one of configurations 1 to 7, wherein the imaging element protection device is disposed between the optical system and the imaging element; An imaging device comprising:

[0045] Although the preferred embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to the above-described embodiments and may be embodied in various different forms within the scope of the technical concept thereof. [Explanation of symbols]

[0046] 1. Imaging device 2 Optical system 3. Image sensor 4. Image sensor protection device 5 aperture 10 Base 11 Shaft 12 Spindle 31~34 Feathers 41,42 Feather arm 50 Actuator 52 screw shaft 53 Guide rail 54 Nut (moving part) 55 Stepping motor (motor) 60 Control Unit 70 Slide lever 80 Rotating Lever 81 First connecting pin (first connecting portion) 82 Second connecting pin (second connecting part) 100 Rotating Plate 101 Light blocking part 110 Light detection unit 121 Magnet 123 Magnetic Sensor 312,322,332,342 Shielding part

Claims

1. An imaging element protection device disposed adjacent to an imaging element, a base portion provided with an opening extending along a first direction and a second direction perpendicular to the first direction; a blade arm that is rotatable around a rotation axis; a blade connected to the blade arm and movable along the first direction in accordance with rotation of the blade arm, the blade including a shielding portion extending along the second direction; an actuator including a motor and a movable part that is movable along a third direction by being driven by the motor; a motion conversion mechanism that converts the movement of the movable part into rotation of the blade arm; a control unit that can switch between an open state in which the shielding unit is positioned outside the opening and a closed state in which at least a part of the shielding unit is positioned inside the opening by driving the motor to move the blades; Equipped with Image sensor protection device.

2. The actuator is a screw shaft extending along the third direction and rotated by the motor; a nut as the movable part that is screwed onto the screw shaft; further comprising: The imaging element protection device according to claim 1 .

3. The motion conversion mechanism includes: a slide lever movable along the third direction and coupled to the movable portion; a rotary lever rotatable about the rotation axis, the rotary lever having a first connecting portion connected to the slide lever and a second connecting portion connected to the blade arm; Including, The imaging element protection device according to claim 1 .

4. a rotational position detection unit that detects the rotational position of the blade arm; the control unit controls driving of the motor based on the rotation position of the blade arm detected by the rotation position detection unit. The imaging element protection device according to claim 1 .

5. The rotation position detection unit a light detection unit including a light emitting element and a light receiving element that receives light emitted from the light emitting element; a rotating plate that rotates together with the blade arm and has one or more light-shielding portions that pass between the light-emitting element and the light-receiving element; Including, The imaging element protection device according to claim 4 .

6. The rotation position detection unit a magnet that rotates together with the blade arm about the rotation axis; a magnetic sensor disposed on the rotation shaft; Including, The imaging element protection device according to claim 4 .

7. the third direction is the same as the first direction; The imaging element protection device according to claim 1 .

8. An optical system; an image sensor disposed on a plane where light passing through the optical system forms an image; 8. The imaging element protection device according to claim 1, wherein the imaging element protection device is disposed between the optical system and the imaging element. An imaging device comprising:

Images