Imaging device
The imaging device addresses the issue of power consumption in imaging devices by using a biased movable part and rotatable holding members to maintain the imaging element's position efficiently, achieving reduced power consumption across various postures and enhancing user convenience.
Patent Information
- Application Number
- JP2023204309
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-12-04
- Publication Date
- 2025-06-16
AI Technical Summary
Existing imaging devices with shake correction mechanisms continue to consume power regardless of the device's posture, limiting the reduction of power consumption and the number of possible shots.
The imaging device incorporates a fixed and movable part with a rolling member, an elastic member, and rotatable holding members. The elastic member biases the movable part toward the fixed part, and the rotatable holding members adjust to maintain the imaging element's position efficiently, reducing power consumption across various postures.
This configuration allows for reduced power consumption in imaging devices regardless of their posture, enhancing user convenience and increasing the number of possible shots without compromising shake correction accuracy.
Smart Images
Figure 2025089608000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an imaging device.
Background Art
[0002] An imaging device having a shake correction mechanism that moves an imaging element using an actuator continuously consumes power while the power is on in order to properly maintain the position of the imaging element. To further improve the user convenience of the imaging device, it is desirable to reduce the power consumption by suppressing the load on the actuator and increase the number of possible shots.
[0003] Patent Document 1 discloses a configuration in which the bending position of a flexible substrate connecting an imaging element and a substrate provided in a main body is set in a direction opposite to gravity with respect to the center of gravity of a movable part. With this configuration, it is possible to suppress the load on the actuator for maintaining the center of the imaging element near the optical axis under the condition that the reaction force of the flexible substrate acts appropriately, and it is possible to reduce the power consumption.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] However, with the configuration disclosed in Patent Document 1, the power consumption cannot be reduced depending on the posture of the imaging device.
[0006] Therefore, an object of the present invention is to provide an imaging device capable of reducing power consumption regardless of the posture.
Means for Solving the Problems
[0007] As one aspect of the present invention, an imaging device includes a fixed part, a movable part that holds an imaging element and is movable in a direction orthogonal to the optical axis with respect to the fixed part, a driving part that drives the movable part, a rolling member disposed between the fixed part and the movable part, an elastic member that biases the movable part toward the fixed part, a first holding member disposed on the fixed part and holding a first end of the elastic member, and a second holding member disposed on the movable part and holding a second end of the elastic member. The first holding member is rotatable about a predetermined axis parallel to the optical axis, and includes a first holding part that holds the elastic member and a weight part. The predetermined axis is disposed between the first holding part and the weight part.
[0008] Other objects and features of the present invention will be described in the following embodiments.
Effects of the Invention
[0009] According to the present invention, it is possible to provide an imaging device capable of reducing power consumption regardless of the posture.
Brief Description of the Drawings
[0010]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Modes for Carrying Out the Invention
[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012] First, referring to FIG. 1, the imaging system 10 according to the present embodiment will be described. FIG. 1 is a schematic configuration diagram of the imaging system 10. The imaging system 10 is a so-called mirrorless digital camera, and includes a main body portion 10a as an imaging device (camera body) and a lens device (interchangeable lens) 10b that is detachable from the main body portion 10a. However, the present embodiment is not limited thereto, and is also applicable to an imaging device in which the main body portion and the lens device are integrally configured.
[0013] The main body portion 10a includes an imaging element 11 having an imaging surface 11a, a base member 13c, a mount member (main body portion mount member) 13a, a camera control unit 14, a first shake correction control unit 15a, a first vibration detection unit 16a, an image processing unit 17, and a first shake correction unit 20. The lens device 10b includes an imaging optical system 12 including a shake correction lens 12b, a mount member (lens side mount member) 13b, a second shake correction control unit 15b, a second vibration detection unit 16b, and a second shake correction unit 60.
[0014] A virtual ray representative of the light beam irradiated onto the imaging surface 11a of the imaging element 11 via the imaging optical system 12 is referred to as an optical axis (imaging optical axis) 12a, and a plane orthogonal to the optical axis 12a is referred to as an optical axis orthogonal plane 12c. The optical axis 12a passes through the center of the imaging surface 11a and is orthogonal to the imaging surface 11a. Further, in order to clarify the arrangement and positional relationship within the imaging system 10 of each part constituting the imaging system 10, X, Y, and Z directions orthogonal to each other are defined. The Z direction is a direction parallel to the optical axis 12a, the X direction is the width direction (horizontal direction) of the imaging system 10, and the Y direction is the height direction (vertical direction) of the imaging system 10. When both the X direction and the Z direction are in the horizontal plane, the Y direction becomes the vertical direction. Therefore, the optical axis orthogonal plane 12c is the XY plane.
[0015] The imaging device 11 is a photoelectric conversion device such as a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor. The imaging device 11 is arranged with its imaging surface 11a facing the subject side (the lens device 10b side) so that the imaging surface 11a is orthogonal to the optical axis 12a. The imaging device 11 generates an image signal by photoelectrically converting the optical image of the subject formed on the imaging surface 11a by the imaging optical system 12. The image signal generated by the imaging device 11 is converted into image data by performing various processes in the image processing unit 17 and stored in a memory (storage device) not shown. The camera control unit 14 is an arithmetic means in a main IC not shown, receives an input operation from a user via an operation means not shown, and controls the overall operation of the imaging system 10.
[0016] The imaging optical system 12 includes a lens group (not shown) arranged inside the lens device 10b, and forms a reflected light from a subject (not shown) on the imaging surface 11a of the imaging device 11. In the imaging system 10, in order to arrange the imaging device 11 with high positional accuracy with respect to the optical axis 12a, the imaging device 11 is attached to a base member 13c provided on the main body 10a, and the lens device 10b is also connected to the base member 13c. At this time, the imaging device 11 is attached to the base member 13c via the first shake correction unit 20. Further, the lens device 10b is connected to the base member 13c via the mount member 13b of the lens device 10b and the mount member 13a of the main body 10a.
[0017] The first blur correction unit 20 corrects image blur caused by shake in the imaging system 10 by moving the imaging device 11 in a direction orthogonal to the optical axis 12a (the direction orthogonal to the optical axis) or rotating it within the plane 12c orthogonal to the optical axis, making it possible to obtain a sharp subject image. Specifically, when the posture of the imaging system 10 changes with respect to the subject during imaging, the imaging position of the subject light beam on the imaging surface 11a of the imaging device 11 changes, causing blur in the image obtained through the imaging device 11. At this time, when the change in the posture of the imaging system 10 is sufficiently small, the change in the imaging position is uniform within the imaging surface 11a and can be regarded as translational or rotational movement (image plane blur) within the plane 12c orthogonal to the optical axis. Therefore, by translating or rotating the imaging device 11 within the plane 12c orthogonal to the optical axis so as to cancel the image plane blur, a sharp subject image with corrected image blur can be obtained. When moving the imaging device 11 in a direction parallel to the imaging surface 11a, movement in a direction orthogonal to the imaging surface 11a may also be performed.
[0018] Similarly, the second blur correction unit 60 corrects image blur caused by shake in the imaging system 10 by moving the blur correction lens 12b in a direction orthogonal to the optical axis or rotating it within the plane 12c orthogonal to the optical axis, making it possible to obtain a sharp subject image. That is, by moving the blur correction lens 12b in a direction orthogonal to the optical axis, the optical axis 12a is refracted. At this time, the blur correction lens 12b is moved in a direction orthogonal to the optical axis so that the image plane blur is canceled. Thereby, a sharp subject image with corrected image blur can be obtained. Since the principle of blur correction by moving the imaging device 11 or the blur correction lens 12b is well-known, a more detailed explanation is omitted. Also, when moving the blur correction lens 12b in a direction orthogonal to the optical axis, movement in the optical axis direction may also be performed.
[0019] The first shake correction unit 20 has a fixed part 20a, a movable part 20b, and a plurality of driving force generation parts. The fixed part is fixed to the base member 13c, and the movable part holds the imaging element 11. The movable part is supported by the fixed part with three degrees of freedom and can move in a direction orthogonal to the optical axis and rotate within the plane 12c orthogonal to the optical axis relative to the fixed part. That is, the first shake correction unit 20 is configured as a driving device (so-called XYθ stage) capable of driving control in three axes, and can move the imaging element 11 in a direction orthogonal to the optical axis and rotate within the plane 12c orthogonal to the optical axis.
[0020] The second shake correction unit 60 has a fixed part, a movable part, and a plurality of driving force generation parts. The fixed part is fixed to a housing (not shown) of the lens device 10b, and the movable part holds the shake correction lens 12b. The movable part is supported by the fixed part with two degrees of freedom and can move in a direction orthogonal to the optical axis relative to the fixed part. That is, the second shake correction unit 60 is configured as a driving device (so-called XY stage) capable of driving control in two axes, and can move the shake correction lens 12b in a direction orthogonal to the optical axis.
[0021] The first vibration detection unit 16a and the second vibration detection unit 16b are each configured with a gyro sensor, an acceleration sensor, or the like, and are shake detection means for detecting the angular velocity, acceleration, etc. in each direction of the imaging system 10 as shake information of the imaging system 10. The first shake correction control unit 15a and the second shake correction control unit 15b calculate the amount of angular change or movement in each direction of the imaging system 10 as shake information by integrating the angular velocity or acceleration detected by the first vibration detection unit 16a and the second vibration detection unit 16b. Further, the first shake correction control unit 15a calculates a movement target value of the imaging element 11 based on the shake information detected by the first vibration detection unit 16a and controls the driving of the first shake correction unit 20. Thereby, the movement of the imaging element 11 can be controlled. Similarly, the second shake correction control unit 15b calculates a movement target value of the shake correction lens 12b based on the shake information detected by the second vibration detection unit 16b and controls the driving of the second shake correction unit 60. Thereby, the movement of the shake correction lens 12b can be controlled.
[0022] Note that the imaging system 10 may not include the second shake correction unit 60. When the second shake correction unit 60 is not provided, basically the shake correction lens 12b is unnecessary. That is, the imaging optical system 12 of the lens device 10b is designed so that desired optical characteristics can be obtained with a lens configuration that does not include the shake correction lens 12b.
[0023] Next, with reference to FIGS. 2(a) to (c) and FIG. 3, the configuration of the first shake correction unit 20 will be described. FIG. 2(a) is a perspective view of the first shake correction unit 20 as seen from the front of the imaging system 10. FIG. 2(b) is a perspective view of the first shake correction unit 20 as seen from the back of the imaging system 10. FIG. 2(c) is a perspective view showing the positions of the drive units (the first actuator 43a, the second actuator 43b, and the third actuator 43c) as seen from the front of the imaging system 10. FIG. 3 is an exploded perspective view of the first shake correction unit 20.
[0024] The fixed part 20a includes a fixing member 21, a rear yoke (plate-like member) 22, a first rear magnet group 23a, a second rear magnet group 23b, and a third rear magnet group 23c. The first rear magnet group 23a, the second rear magnet group 23b, and the third rear magnet group 23c are arranged so as to be surrounded by an opening provided in the fixing member 21 and are fixed to the fixing member 21 with an adhesive or the like. In the present embodiment, the first rear magnet group 23a, the second rear magnet group 23b, and the third rear magnet group 23c are each arranged such that two magnets magnetized in the direction along the optical axis 12a (optical axis direction) generate magnetic fields in opposite directions. However, the present embodiment is not limited to this, and one magnet magnetized in a dipole may be used.
[0025] The fixed portion 20a further includes a first column member 24a, a second column member 24b, a third column member 24c, a front yoke 25, a first front magnet 26a, a second front magnet 26b, and a third front magnet 26c. The front yoke 25 is fixed to the fixing member 21 with screws via the first column member 24a, the second column member 24b, and the third column member 24c. The first front magnet 26a, the second front magnet 26b, and the third front magnet 26c are each fixed to the front yoke 25 with an adhesive or the like. In the present embodiment, the first front magnet 26a, the second front magnet 26b, and the third front magnet 26c are each a single magnet magnetized in two poles. However, the present embodiment is not limited to this, and two magnets magnetized in the optical axis direction may be arranged so as to generate magnetic fields in opposite directions.
[0026] The first rear magnet group 23a and the first front magnet 26a are arranged along the optical axis direction to constitute a first magnetic circuit. Similarly, the second rear magnet group 23b and the second front magnet 26b, and the third rear magnet group 23c and the third front magnet 26c are each arranged along the optical axis direction to constitute a second magnetic circuit and a third magnetic circuit.
[0027] The fixed portion 20a includes a first regulating member 28 and a second regulating member 29. The front yoke 25 includes a regulating portion 25a. The movement of the movable portion 20b in the direction within the plane 12c orthogonal to the optical axis is regulated within a predetermined range by the first regulating member 28, the second regulating member 29, the regulating portion 25a of the front yoke 25, the first column member 24a, the second column member 24b, and the third column member 24c. A cushioning material such as rubber is provided at each contact portion to absorb the impact when contacting and suppress breakage and the generation of a large impact sound.
[0028] The movable part 20b is movable in a direction orthogonal to the optical axis 12a with respect to the fixed part 20a, and includes a movable member 31 and an imaging element 11. The imaging element 11 is fixed to the movable member 31 with an adhesive or the like. The movable part 20b further includes a first coil 33a, a second coil 33b, a third coil 33c, and a driving FPC 35. The driving FPC 35 is arranged so as to cover the first coil 33a, the second coil 33b, and the third coil 33c on the projection of the optical axis orthogonal plane 12c, and is fixed to the movable member 31 with an adhesive or the like. The first coil 33a, the second coil 33b, and the third coil 33c are respectively arranged inside recesses provided in the movable member 31, and are fixed to the movable member 31 with an adhesive or the like.
[0029] The first actuator 43a, the second actuator 43b, and the third actuator 43c are driving parts for driving the movable part 20b. The first actuator 43a is a VCM (voice coil motor) composed of a first magnetic circuit and the first coil 33a. The second actuator 43b is a VCM composed of a second magnetic circuit and the second coil 33b. The third actuator 43c is a VCM composed of a third magnetic circuit and the third coil 33c. A Lorentz force is generated in a direction orthogonal to the magnetic field generated in the optical axis direction by the first magnetic circuit and the current flowing through the first coil 33a, and the resultant force direction of the Lorentz force changes according to the energization direction of the first coil 33a. Similarly, a Lorentz force is also generated in the relationship between the second magnetic circuit and the second coil 33b, and the third magnetic circuit and the third coil 33c.
[0030] The first actuator 43a and the second actuator 43b generate forces substantially parallel in the X direction, and the sum of the respective forces generates a translational force in the X direction, and the difference generates a rotational force around the optical axis 12a (around the optical axis). The third actuator 43c generates a translational force in the Y direction.
[0031] The drive FPC 35 includes a first detector 35a, a second detector 35b, and a third detector 35c. The first detector 35a is disposed inside the first coil 33a, the second detector 35b is disposed inside the second coil 33b, and the third detector 35c is disposed inside the third coil 33c. The first detector 35a, the second detector 35b, and the third detector 35c are each Hall elements. The first detector 35a, the second detector 35b, and the third detector 35c each detect the magnetic force of the first magnetic circuit, the second magnetic circuit, and the third magnetic circuit. And the first shake correction control unit 15a calculates the position on the optical axis orthogonal plane 12c of the movable part 20b with respect to the fixed part 20a and the angle around the optical axis based on the detection result. The first coil 33a, the second coil 33b, and the third coil 33c are each electrically connected to the drive FPC 35 and are energized by the first shake correction control unit 15a via the drive FPC 35. The movable part 20b is always loaded in the direction of gravity due to its own weight. The first coil 33a, the second coil 33b, and the third coil 33c are each always energized while the power of the imaging system 10 is on in order to properly maintain the position of the imaging element 11.
[0032] The movable part 20b includes a sheet metal member 38, and the sheet metal member 38 is fixed to the movable member 31 with screws. The rear yoke 22 includes a first holding member 41, the sheet metal member 38 includes a second holding member 40, and the first holding member 41 and the second holding member 40 are connected to each other via a spring member (elastic member) 42. The detailed shape of the connecting portion will be described later. The first holding member 41 is disposed on the fixed part 20a and holds one end (the first end) of the spring member 42. The second holding member 40 is disposed on the movable part 20b and holds the other end (the second end) of the spring member 42.
[0033] The movable part 20b is biased by a spring member 42 against a fixing member 21 of the fixed part 20a via rolling members 36a, 36b, and 36c. The rolling members 36a, 36b, and 36c are respectively disposed between the fixed part 20a and the movable part 20b and inside an enclosing part provided on the movable member 31. When the movable part 20b moves in a direction (direction orthogonal to the optical axis) within the plane 12c orthogonal to the optical axis with respect to the fixed part 20a, the rolling members 36a, 36, and 36b roll, so that substantially no load due to friction is generated.
[0034] Also, the movement of the movable part 20b in the direction opposite to the biasing direction by the spring member 42 is restricted by the front yoke 25 and the first restricting member 28. Therefore, even if an impact is applied to the main body part 10a, the movable part 20b does not drop off from the fixed part 20a. [Embodiment 1] Next, with reference to FIGS. 4(a), (b) and FIGS. 5(a), (b), the operations of the first holding member 41 and the second holding member 40 according to the posture (holding posture) of the imaging system 10 in Embodiment 1 will be described. FIG. 4(b) is a rear view of the first shake correction unit 20 with the bottom surface of the imaging system 10 according to this embodiment facing downward in the gravity direction. FIG. 4(a) is a cross-sectional view taken along line A-A in FIG. 4(b). FIG. 5(b) is a rear view of the first shake correction unit 20 with the left side surface of the imaging system 10 facing downward in the gravity direction. FIG. 5(a) is a cross-sectional view taken along line B-B in FIG. 5(b).
[0035] The first holding member 41 is held rotatably (pivotably) about a predetermined axis (rotation center R) parallel to the optical axis 12a with respect to the rear yoke 22. The first holding member 41 and the second holding member 40 each include a first spring holding portion (first holding portion) 41a having a hook shape and a second spring holding portion (second holding portion) 40a. By hooking the spring member 42 on the first spring holding portion 41a and the second spring holding portion 40a, the first holding member 41 and the second holding member 40 are connected to each other. The first holding member 41 also includes a weight portion 41b, and the center of gravity of the first holding member 41 is located in the direction of the weight portion 41b side (closer to the weight portion 41b than the rotation center R) with respect to the rotation center R of the first holding member 41. The first spring holding portion 41a is located on the opposite side of the weight portion 41b across the rotation center R of the first holding member 41.
[0036] That is, the rotation center R of the first holding member 41 is disposed between the first spring holding portion 41a and the weight portion 41b. In other words, as shown in FIG. 4(a), in a state where the center of the imaging surface of the imaging element 11 is located on the optical axis, the direction from one end to the other end of the spring member 42 (the direction of the biasing force F) is inclined with respect to the optical axis direction (a direction parallel to the direction of the rotation center R). More specifically, in a state where the center of the imaging surface of the imaging element 11 is located on the optical axis, the first spring holding portion 41a is located above the second spring holding portion 40a in the direction of gravity from top to bottom. For this reason, regardless of the holding posture of the imaging system 10, the first spring holding portion 41a is always disposed above the center of gravity direction with respect to the rotation center R of the first holding member 41.
[0037] When the center of the imaging element 11 is positioned near the optical axis 12a, the second spring holding portion 40a is disposed on the approximate rotation center R of the first holding member 41. The first spring holding portion 41a is always disposed above the second spring holding portion 40a in the direction of gravity regardless of the holding posture of the imaging system 10 with respect to the second spring holding portion 40a. With such a configuration, the movable portion 20b is always biased in the direction opposite to the direction of gravity (the direction from the rotation center R to the weight portion 41b) by the spring member 42 regardless of the holding posture of the imaging system 10. By the biasing force in the direction opposite to the direction of gravity by the spring member 42, a part of the self-weight applied to the movable portion 20b is canceled, and the power supplied to the first coil 33a, the second coil 33b, and the third coil 33c necessary for properly maintaining the position of the imaging element 11 can be reduced.
[0038] Further, the first holding member 41 has a sliding portion 41c that abuts on and slides on the rear yoke 22 around the first spring holding portion 41a. By disposing the sliding portion 41c at this position, it is possible to suppress the first holding member 41 from tilting with respect to the rear yoke 22 due to the biasing force of the spring member 42, and to ensure the followability with respect to the change in the holding posture of the imaging system 10.
[0039] When the movable portion 20b is driven by shake correction control, in order to maintain the accuracy of the shake correction control, it is preferable that the rotation angle by which the first holding member 41 rotates due to the biasing force of the spring member 42 is as small as possible. For this reason, as shown in FIG. 4(a), the distance L1 from the rotation center R of the first holding member 41 to the center of gravity 41d of the first holding member 41 is preferably longer than the distance L2 from the rotation center R of the first holding member 41 to the first spring holding portion 41a. More preferably, the distance L1 is longer than twice the distance L2. Even more preferably, the distance L1 is longer than three times the distance L2. Also, the self-weight of the first holding member 41 is preferably larger than the component force Fxy generated in the XY plane (a plane perpendicular to the optical axis) of the biasing force F (maximum load) acting on the first holding member 41 by the spring member 42.
[0040] In addition, as countermeasures other than the above to maintain the accuracy of the shake correction control, the following countermeasures are also useful. The weight portion 41b of the first holding member 41 and the rear yoke 22 are made of a magnetic material, and the weight portion 41b and the rear yoke 22 are in a relationship of attracting each other. As shown in FIG. 4(a), since the rear yoke 22 is provided with an opening 22a, the first holding member 41 has resistance to rotation at specific rotational positions (phase P and phase Q). That is, the first holding member 41 obtains an attractive force from the rear yoke 22 at specific rotational positions. At phases P and Q, since the first holding member 41 is made difficult to rotate by the biasing force of the spring member 42, it is possible to maintain the accuracy of the shake correction control. Since the imaging system 10 is often used after being rotated 90° around the Z axis, in this embodiment, the weight portion 41b of the first holding member 41 is configured to have resistance to rotation in the four directions of up, down, left, and right of the imaging system 10.
[0041] In this embodiment, by engaging the cylindrical shape provided in a part of the second holding member 40 with the circular opening of the sheet metal member 38, the second holding member 40 is held in a state where it can rotate around an axis parallel to the optical axis 12a with respect to the sheet metal member 38. With such a configuration, when the holding posture of the imaging system 10 changes, the second holding member 40 rotates following the first holding member 41, so that it is possible to reduce (more preferably prevent) damage to the spring member 42 and changes in the spring force. At this time, when the center of the imaging surface of the imaging element 11 is located on the optical axis, it is preferable that the center of gravity of the movable portion 20b and the second spring holding portion 40a are arranged on the axis of the rotation center R of the second holding member 40. Thereby, it is possible to obtain a stable power reduction effect regardless of the holding posture of the imaging system 10. [Embodiment 2] Next, referring to FIGS. 6(a) and 6(b), Example 2 will be described. FIG. 6(b) is a rear view of the first shake correction unit 20 with the bottom surface of the imaging system 10 according to this example facing downward in the gravitational direction. FIG. 6(a) is a cross-sectional view taken along line C-C in FIG. 6(b). Here, since the imaging system 10 in this modification is basically the same as the aforementioned imaging system 10, the description will focus on the differences between the two, and the description of the same parts will be omitted. Also, the same reference numerals will be used to describe the parts common to Example 1.
[0042] In this example, a spherical second holding member 40 provided with a spring member 42 is engaged with a circular opening 38a of the sheet metal member 38. At this time, the spherical second holding member 40 is rotatably held with respect to the sheet metal member 38. With such a configuration, as in Example 1, when the holding posture of the imaging system 10 changes, the second holding member 40 rotates following the first holding member 41, so that it is possible to prevent damage to the spring member 42 and changes in the spring force. At this time, if the center of gravity of the second spring holding portion 40a and the movable portion 20b is arranged on the axis of the rotation center R of the second holding member 40, a stable power reduction effect can be obtained regardless of the holding posture of the imaging system 10.
[0043] The disclosure of each example includes the following configurations. (Configuration 1) A fixed portion, A movable portion that holds an imaging element and is movable in a direction orthogonal to the optical axis with respect to the fixed portion, A driving portion that drives the movable portion, A rolling member disposed between the fixed portion and the movable portion, An elastic member that biases the movable portion toward the fixed portion, A first holding member disposed on the fixed portion and holding the first end of the elastic member, A second holding member disposed on the movable portion and holding the second end of the elastic member, and The first holding member is rotatable around a predetermined axis parallel to the optical axis, and has a first holding portion that holds the elastic member and a weight portion. The imaging device is characterized in that the predetermined axis is disposed between the first holding portion and the weight portion. (Configuration 2) The imaging device according to Configuration 1, wherein, in a state where the center of the imaging surface of the imaging element is located on the optical axis, the direction from the first end to the second end of the elastic member is inclined with respect to the optical axis direction. (Configuration 3) The first holding member has a second holding portion for holding the elastic member. The imaging device according to Configuration 1 or 2, wherein, in a state where the center of the imaging surface of the imaging element is located on the optical axis, the first holding portion is located above the second holding portion in the direction of gravity from top to bottom. (Configuration 4) The fixing portion has a plate-like member. The first holding member has a sliding portion that abuts against the plate-like member. The imaging device according to any one of Configurations 1 to 3, wherein the sliding portion is disposed around the first holding portion. (Configuration 5) The imaging device according to any one of Configurations 1 to 4, wherein the distance from the predetermined axis of the first holding member to the center of gravity of the first holding member is longer than the distance from the predetermined axis to the first holding portion. (Configuration 6) The imaging device according to any one of Configurations 1 to 5, wherein the self-weight of the first holding member is greater than the component force in the plane perpendicular to the optical axis of the maximum load acting on the first holding member by the elastic member. (Configuration 7) The fixing portion has a plate-like member. The imaging device according to any one of Configurations 1 to 6, wherein the first holding member is made of a magnetic material and obtains an attractive force from the plate-like member at a specific rotational position. (Configuration 8) The imaging device according to any one of Configurations 1 to 7, wherein the second holding member rotates around an axis parallel to the optical axis following the first holding member. (Configuration 9) The imaging device according to any one of Configurations 1 to 8, characterized in that, in a state where the center of the imaging surface of the imaging element is located on the optical axis, the center of gravity of the movable part and the second holding part are arranged on the predetermined axis.
[0044] As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist thereof.
Explanation of Reference Numerals
[0045] 10a Main body part (imaging device) 11 Imaging element 20a Fixed part 20b Movable part 36a, 36b, 26c Rolling members 40 Second holding member 41 First holding member 41a First spring holding part (first holding part) 41b Weight part 42 Spring member (elastic member) 43a First actuator (drive part) 43b Second actuator (drive part) 43c Third actuator (drive part) R Rotation center (predetermined axis)
Claims
1. A fixed part, A movable part that holds an imaging element and is movable in a direction perpendicular to the optical axis with respect to the fixed part, A driving part that drives the movable part, A rolling member disposed between the fixed part and the movable part, An elastic member that biases the movable part toward the fixed part, A first holding member disposed on the fixed part and holding a first end of the elastic member, A second holding member disposed on the movable part and holding a second end of the elastic member, and having, The first holding member is rotatable about a predetermined axis parallel to the optical axis, and has a first holding part that holds the elastic member and a weight part, The predetermined axis is disposed between the first holding part and the weight part. An imaging device characterized by this.
2. In a state where the center of the imaging surface of the imaging element is located on the optical axis, the direction from the first end to the second end of the elastic member is inclined with respect to the optical axis direction. The imaging device according to claim 1, characterized by this.
3. The first holding member has a second holding part that holds the elastic member, In a state where the center of the imaging surface of the imaging element is located on the optical axis, the first holding part is located above the second holding part in the direction of gravity from top to bottom. The imaging device according to claim 1 or 2, characterized by this.
4. The fixed part has a plate-like member, The first holding member has a sliding part that abuts against the plate-like member, The sliding part is disposed around the first holding part. The imaging device according to claim 1 or 2, characterized by this.
5. The distance from the predetermined axis of the first holding member to the center of gravity of the first holding member is longer than the distance from the predetermined axis to the first holding part. The imaging device according to claim 1 or 2, characterized by this.
6. The imaging device according to claim 1 or 2, characterized in that the self-weight of the first holding member is greater than the component force in a plane perpendicular to the optical axis of the maximum load acting on the first holding member by the elastic member.
7. The fixing portion has a plate-like member, The imaging device according to claim 1 or 2, characterized in that the first holding member is made of a magnetic material and obtains an attractive force from the plate-like member at a specific rotational position.
8. The imaging device according to claim 1 or 2, characterized in that the second holding member rotates around an axis parallel to the optical axis following the first holding member.
9. The imaging device according to claim 1 or 2, characterized in that in a state where the center of the imaging surface of the imaging element is located on the optical axis, the center of gravity of the movable portion and the second holding portion are arranged on the predetermined axis.
Citation Information
Patent Citations
Imaging apparatus
JP2021166334A