WO2020013081A1

WO2020013081A1 - Imaging device

Info

Publication number: WO2020013081A1
Application number: PCT/JP2019/026715
Authority: WO
Inventors: 下小路　章; 裕志西谷
Original assignee: 株式会社ニコン
Priority date: 2018-07-09
Filing date: 2019-07-04
Publication date: 2020-01-16
Also published as: JPWO2020013081A1; JP7294340B2

Abstract

The present invention provides an imaging device that is capable of shake correction and does not readily break. This imaging device 1 comprises: a movable unit 25 on which an imaging element 23 is disposed and which is provided so as to be capable of moving; a first drive unit 21 for causing the movable unit 25 to move; an engagement unit 50 capable of moving to a first position, at which the engagement unit 50 engages with a unit 28 to be engaged that is provided on the side of the movable unit 25 opposite from the side on which the imaging element 23 is disposed and moreover at which the movement of the movable unit 25 is limited, and to a second position, at which the engagement unit 50 does not engage with the unit 28 to be engaged and moreover at which the movement of the movable unit 25 is not limited; and a second drive unit 49 for causing the engagement unit 50 to move between the first position and the second position.

Description

Imaging device

<< The present invention relates to an imaging device.

Conventionally, there has been disclosed an imaging apparatus that corrects camera shake by driving an image sensor when camera shake is detected (for example, see Patent Document 1). In this conventional imaging apparatus, a mechanism for holding the imaging element at a predetermined position is provided.

JP-A-2014-26147

An imaging device according to the present invention includes a movable section on which an imaging element is arranged and movably provided, a first driving section for moving the movable section, and an opposite surface of the movable section on which the imaging element is arranged. A first position for engaging the engaged portion provided on the surface and restricting the movement of the movable portion, and a second position for not engaging the engaged portion and restricting the movement of the movable portion. And a second drive unit that moves the engagement unit between the first position and the second position.

Further, the image pickup apparatus of the present invention includes a movable section on which an image pickup device is arranged and movably provided, a first drive section for moving the movable section, and an engaged section provided on the movable section. At least three engagements movable between a first position in which the movable portion is restricted by engagement and a second position in which the movable portion is not engaged and does not restrict the movement of the movable portion. And a second drive unit that moves the engagement unit between the first position and the second position.

Further, the image pickup device of the present invention has an image pickup device, a movable portion provided to be movable in a direction parallel to an image pickup surface of the image pickup device with respect to a fixed portion, and the image pickup device of the movable portion being provided. The engaged portion provided on the surface opposite to the surface that has been pressed is pressed from a direction perpendicular to the imaging surface via an elastic member, and the movable portion moves in a direction parallel to the imaging surface due to frictional force. And a restricting unit for restricting.

Further, the image pickup device of the present invention is arranged such that an image sensor is arranged, a movable portion provided to be movable in a direction parallel to an imaging surface of the image sensor with respect to a fixed portion, and the image sensor of the movable portion is arranged. And a restricting portion that restricts movement of the movable portion by pressing an engaged portion provided on a surface opposite to the surface on which the movable portion is provided, in a direction parallel to the imaging surface.

FIG. 1 is a schematic diagram illustrating a camera 1 according to an embodiment and an interchangeable lens 2 that is detachable from the camera 1. FIG. 3 is a perspective view of the imaging unit 20 and a movement restriction mechanism 40 as viewed from an oblique front side. FIG. 3 is a perspective view of the imaging unit 20 and a movement restriction mechanism 40 as viewed from an oblique rear side. It is a rear view of the movable part 25. FIG. 3 is an enlarged view of an engaged portion and an engaging portion. It is a rear view of the fixing part 24. It is the perspective view which looked at the movement restricting mechanism 40 from the front diagonal. It is the perspective view which looked at the movement restricting mechanism 40 from the back diagonal. FIG. 4 is a perspective view of a cam plate 43. It is a flow chart explaining operation of control part 14 of camera 1 in a 2nd embodiment. FIG. 11 is an exploded perspective view of a movement restriction mechanism 140 according to a third embodiment as viewed obliquely from the front. It is the disassembled perspective view which looked at the movement restricting mechanism 140 of 3rd Embodiment from back diagonally. FIG. 14 is a rear view of the movement restriction mechanism 140 according to the third embodiment. FIG. 13 is a front view of a movement restriction mechanism 140 at a first position restricting movement of an engaged portion 28 in the third embodiment. FIG. 13 is a front view of a movement restriction mechanism 140 at a second position where the movement of the engaged portion 28 is not restricted in the third embodiment. It is the perspective view which looked at the movement restricting mechanism 140 in the 1st state which restricts movement of engaged part 28 in a 3rd embodiment from the front side. It is the perspective view which looked at the movement restriction mechanism 140 in the 2nd state which does not restrict the movement of the to-be-engaged part 28 from 3rd Embodiment from the front side.

(1st Embodiment)
Hereinafter, a camera 1 as a first embodiment of an imaging device will be described with reference to the drawings and the like. FIG. 1 is a schematic diagram illustrating a camera 1 according to a first embodiment and an interchangeable lens 2 that is detachable from the camera 1. In the first embodiment, the camera 1 to which the interchangeable lens 2 is detachable will be described. However, the camera 1 may be a lens-integrated camera.

(Camera 1)
The camera 1 includes an imaging unit 20 including an imaging element 23, a movement restriction mechanism 40 that restricts movement of the movable unit 25 including the imaging element 23 in the imaging unit 20, a release switch 11, a display unit 12, a blur detection sensor 13, a first drive unit 21, a position detection unit 22, a control unit 14, and an operation unit 15.

The release switch 11 is a member for performing a shooting operation of the camera 1, and operates a shutter drive timing (not shown) and the like.

The image pickup device 23 is provided on a predetermined focal plane of a photographing optical system of the interchangeable lens 2, and under the control of the control unit 14, performs photoelectric conversion of subject image light incident via the photographing optical system of the interchangeable lens 2 to generate a signal. Generate. The imaging element 23 is configured by, for example, a CCD, a CMOS, or the like.

The display unit 12 is a color liquid crystal display that is provided on the back of the camera 1 and displays a captured subject image (still image, moving image including live view image), information (menu) related to operation, and the like.

The shake detection sensor 13 detects a shake caused by a camera shake of the camera 1 by an acceleration sensor or an angular velocity sensor.

The control unit 14 controls the imaging of the image sensor 23 by pressing the release switch 11. Further, the control unit 14 performs processing such as noise processing and A / D conversion on the signal output from the imaging element 23, generates image data, and displays the image data on the display unit 12. Further, the control unit 14 detects a target position of the image sensor 23 based on the shake signal of the image sensor 23 detected by the shake detection sensor 13. Then, the control unit 14 calculates a drive amount for correcting blurring of the image sensor 23 based on the detected target position, and drives the image sensor 23 via the first drive unit 21 based on the calculated drive amount. I do.

(Imaging unit 20)
FIG. 2 is a perspective view of the imaging unit 20 and the movement restricting mechanism 40 as viewed from a diagonally front side, and FIG. 3 is a perspective view of the imaging unit 20 and the movement restriction mechanism 40 as viewed from a diagonally rear side.
In the following drawings, an XY orthogonal coordinate system is provided as appropriate for easy explanation and understanding. In this coordinate system, the direction toward the left side as viewed from the photographer at the position (the normal position) of the camera 1 when the photographer photographs the horizontally long image with the optical axis OA being horizontal is defined as the X plus direction. In addition, the upward direction at the normal position is defined as the Y plus direction. In the following description, the subject side in the optical axis OA direction is the front side, the opposite side is the rear side, the Y plus side is up, the Y minus side is down, and the rear side is the back side.

The imaging unit 20 includes the fixed unit 24, the movable unit 25 movable in the XY plane with respect to the fixed unit 24, and the first drive unit 21 and the position detection unit 22 illustrated in FIG. 1 described above.

(Movable part 25)
FIG. 4 is a rear view of the movable section 25. The movable section 25 includes a movable frame 26 that holds an outer peripheral portion on the back surface of the image sensor 23, and the image sensor 23 is mounted on the front surface of the movable frame 26.

(Movable frame 26)
In the movable frame 26, on the plus side in the X direction of the image sensor 23 indicated by a dotted line in FIG. 4, the coil 211 for driving in the X direction as the first drive unit 21 and the minus side in the Y direction of the image sensor 23 ( On the lower side), coils 212 and 213 for driving in the Y direction and for driving in the rotation direction as the first driving unit 21 are attached. Further, a yoke 214 is attached to the front surface of the movable frame 26.

(Engaged part 28)
A movable side opening 26a is provided in a portion of the movable frame 26 located on the back side of the image sensor 23. Arms 27 extend inward from three locations on the inner edge of the movable side opening 26a. The arm portions 27 extend in a direction toward the center of gravity G of the movable portion 25, and each of the arm portions 27 is provided with an engaged portion 28 at the tip thereof.
FIG. 5 is an enlarged view of the engaged portion 28 and an engaging portion 50 described later. As shown, the engaged portion 28 protrudes rearward from the tip of the arm 27 and abuts on the back surface. A surface 28a is provided.

As shown in FIG. 4, the three engaged portions 28 are arranged on a circumference S of the same diameter centered on the center of gravity G of the movable portion 25. That is, the engaged portion 28 is disposed around the center of gravity G of the movable portion 25, and the center of gravity G is shifted from the point A through which the optical axis OA, which is the imaging center of the imaging element 23, passes. .

(Fixing part 24)
The fixing unit 24 includes a fixing frame 30 fixed to the housing of the camera 1. FIG. 6 is a rear view of the fixed frame 30 of the fixed portion 24 and the

magnets

311, 312, and 313.

(Fixed frame 30)
The fixed frame 30 is provided with a fixed-side opening 24a. The fixed side opening 24a is located on the back side of the movable side opening 26a. As shown in FIG. 3, the engaged portion 28 is exposed to the rear through the fixed side opening 24a.
The fixed frame 30 has a magnet 311 for driving in the X direction as a first driving unit 21 on the plus side in the X direction and a first driving unit 21 on the minus side (lower side) in the Y direction of the image sensor 23. 312 and 313 for driving in the Y direction and driving in the rotation direction are attached.

(Position detector 22)
As shown in FIG. 1, a position detection unit 22 is provided in the imaging unit 20. The position detector 22 detects the position of the movable unit 25 with respect to the fixed unit 24. In the present embodiment, the position detection unit 22 is, for example, a hall element 22a attached to the movable unit 25 and a position detection magnet 22b attached to the fixed unit 24, but is not limited thereto, and a light emitting unit and a light receiving unit (PSD) ).

(First drive unit 21)
As described above, the first drive unit 21 is provided on the

coils

211, 212, 213 and the yoke 214 provided on the movable frame 26 shown in FIGS. 1 and 4, and on the fixed frame 30 shown in FIGS. 1 and 6. A voice coil motor (VCM) including the

magnets

311, 312, and 313 provided. As shown in FIGS. 4 and 6, the first driving unit 21 is disposed at three locations around the image sensor 23.

The movable portion 25 and the fixed portion 24 are urged toward each other by a spring member via three balls (not shown), whereby the movable frame 26 is moved in the X-axis direction and the Y-axis direction with respect to the fixed frame 30. , Are supported so as to be movable in a rotation direction about the optical axis OA.

When a current flows through the

coils

211, 212, and 213, an electromagnetic force acts on portions of the

coils

211, 212, and 213 in which the direction of the current is orthogonal to the magnetic lines of force of the

magnets

311, 312, and 313, and the movable unit 25 is 24.
When the direction of the current flowing through the

coils

211, 212, and 213 is reversed, the movable section 25 is driven in the reverse direction. Further, the force acting on the movable portion 25 can be changed depending on the magnitude of the current flowing through the

coils

211, 212, and 213.

(Movement restriction mechanism 40)
When current is flowing through the

coils

211, 212, and 213, the movable portion 25 is held at a predetermined position by electromagnetic force acting on the

coils

211, 212, and 213 of the movable portion 25. However, when the power supply to the

coils

211, 212, and 213 is stopped, the force for holding the movable portion 25 is lost. Then, when an external force is applied to the movable portion 25, the movable portion 25 moves easily. For example, the movable portion 25 falls down due to gravity, or the movable portion 25 moves easily when the camera 1 is carried. As a result, various parts may be damaged due to contact between articles.

Therefore, the embodiment has the movement restriction mechanism 40 for fixing the movable portion 25 when the power is not supplied. The movement restricting mechanism 40 is arranged in a space on the back side of the imaging unit 20 in the housing of the camera 1 as described in FIGS. FIG. 7 is a perspective view of the movement restriction mechanism 40 as viewed obliquely from the front side, and FIG. 8 is a perspective view of the movement restriction mechanism 40 as viewed obliquely from the rear side.

The movement restricting mechanism 40 includes, from the rear side, a base plate 41, a gear portion 42, a cam plate 43, a moving plate 47 having a holding spring 44 (first elastic member), and a biasing spring 45 (second elastic member). ) And a cover plate 46.

(Base plate 41)
The base plate 41 is a member that holds the gear portion 42, the cam plate 43, and the moving plate 47. The moving plate holding shaft 41a that holds the moving plate 47, and the moving plate holding shaft 41a that is concentric with the moving plate holding shaft 41a. A cam plate holding ring 41b provided on the outer periphery of the gear and a gear support shaft 41c provided outside the cam plate holding ring 41b extend from the front surface toward the front. In the lower part of the base plate 41, a moving plate rotation stopper 41d similarly extends from the front surface toward the front side. The moving plate holding shaft 41a extends along an axis G1 which is a rotation center of the cam plate 43.

On the side of the base plate 41 where the gear support shaft 41c is provided (X minus side), a motor 49 serving as an actuator, which is a second driving unit, is fixed. The rotation shaft of the motor 49 extends in the Y direction, and a worm gear 49a is attached to the outer periphery of the rotation shaft.
In the embodiment, as shown in FIGS. 2 and 3, the entire motor 49 is located on the back side of the first drive unit 21. However, the present invention is not limited to this, and at least a part of the motor 49 may be located on the back side of the first driving unit 21.

(Gear part 42)
The gear portion 42 has a disk shape and is provided with gear teeth 42 a on the outer periphery, and is rotatably attached to a gear support shaft 41 c provided on the base plate 41.

(Cam plate 43)
FIG. 8 is a perspective view of the cam plate 43. The cam plate 43 has an annular shape, and is fitted to the outer peripheral side of a cam plate holding ring 41b provided on the base plate 41 so as to be relatively rotatable.
The cam plate 43 has cam gear teeth 43 a formed on a part of the outer periphery, and meshes with the gear teeth 42 a of the gear portion 42. On the front surface of the cam plate 43, slopes 43b provided by gradually changing the thickness in the direction of the optical axis OA are provided at three places at equal intervals in the circumferential direction.

(Moving plate 47)
The moving plate 47 has a disk shape, and a moving plate holding shaft 41a provided on the base plate 41 is inserted into a hole provided at the center, and is attached to the base plate 41 so as to be able to move back and forth.
Engaging portions 50 are formed outwardly from three equally spaced locations on the outer peripheral side of the moving plate 47.
A U-shaped detent 47a extends outward from one position on the outer peripheral side of the moving plate 47. The relative rotation of the movable plate 47 with respect to the base plate 41 is prevented by the engagement between the rotation stopper 47a and the movable plate rotation stopper receiver 41d of the base plate 41.
On the rear surface of the movable plate 47, projections 47b projecting rearward are provided at three equally spaced locations on the same circumference having the same diameter as the inclined surface 43b of the cam plate 43.

(Engagement part 50)
The engagement portions 50 are formed outward from three equally-spaced locations on the outer peripheral side of the movable plate 47 about the axis G1. FIG. 5 described above is a diagram illustrating an engagement state between the engagement portion 50 and the engaged portion 28 provided on the movable frame 26.
The engaging portion 50 is provided on the outer peripheral side of the moving plate 47. In the outer peripheral portion of the moving plate 47, a concave portion 51 is formed which is concave toward the inside and concave toward the rear side. Each of the concave portions 51 has an outer peripheral surface 51a of a fixed length extending in the circumferential direction around the axis G1, and two inner surfaces 51b extending radially outward from both circumferential sides of the outer peripheral surface 51a. ing.

On the other hand, the engaged portions 28 provided on the movable frame 26 have diameters from an inner peripheral surface 28b extending at a fixed length in the circumferential direction around the center of gravity G and from both sides of the inner peripheral surface 28b in the circumferential direction. And two outer surfaces 28c extending outward in the direction.

Here, the distance between the two outer surfaces 28c, that is, the circumferential width of the contact surface 28a (the engaged portion 28) is the distance between the two inner surfaces 51b of the recess 51, that is, the circumferential width of the recess 51. Greater than width.
The diameter of the circumference of the engaging portion 50 where the outer peripheral surface 51a is formed is smaller than the diameter of the circumference of the engaged portion 28 where the inner peripheral surface 28b is formed.

Accordingly, the engaging portion 50 moves forward, the outer peripheral surface 51a of the engaging portion 50 and the inner peripheral surface 28b of the engaged portion 28 face each other, and the inner surface 51b of the engaging portion 50 and the engaged portion When the engaged portion 28 enters the concave portion 51 of the engaging portion 50 so that the outer surface 28c of the engaging portion 28 faces the outer surface 28c, between the opposed inner peripheral surface 28b and the outer peripheral surface 51a, and A gap is created between the opposed inner surface 51b and the outer surface 28c.

The concave portion 51 is provided with a U-shaped (L-shaped) leaf spring member 52.
Both ends 52a of the leaf spring member 52 are fixed to both sides of the concave portion 51 of the movable plate 47 with respect to the concave portion 51 on the inner diameter side.
The central portion of the U-shape (L-shape) of the leaf spring member 52 enters the inside of the concave portion 51 and extends forward, and the tip is bent to form a pressing portion 52b.

(Cover plate 46)
On the front side of the moving plate 47, a cover plate 46 is disposed with an urging spring 45 interposed therebetween. The cover plate 46 is fixed to the base plate 41. The movable plate 47 can move back and forth while being urged rearward by the urging spring 45.

(motion)
At the time of photographing, the engagement portion 50 of the movement restriction mechanism 40 is at the second position separated from the engaged portion 28. At this time, the engaging portion 50 does not engage with the engaged portion 28 and does not limit the movement of the movable portion 25 with respect to the fixed portion 24.
In this state, for example, if the main power supply of the camera 1 is turned off by the photographer, the stepping motor 49 fixed to the base plate 41 rotates before the power supply is completely turned off.
Then, the worm gear 49a of the rotating shaft of the motor 49 meshes with the gear teeth 42a of the gear portion 42, and the rotational force of the motor 49 is transmitted to the gear portion 42, so that the gear portion 42 rotates.

When the gear 42 rotates, the cam gear 43 rotates because the cam gear teeth 43a of the cam plate 43 mesh with the gear 42.

Then, since the height of the slope 43b of the cam plate 43 in contact with the projection 47b of the moving plate 47 changes, the moving plate 47 is pushed by the slope 43b and moves forward.

When the engaging portion 50 moves forward, the outer peripheral surface 51a of the engaging portion 50 and the inner peripheral surface 28b of the engaged portion 28 face each other, and the inner surface 51b of the engaging portion 50 and the outer surface of the engaged portion 28 The engaged portion 28 enters the inside of the concave portion 51 of the engaging portion 50 such that the side surface 28c is opposed to the side surface 28c.
That is, the engaging portion 50 engages with the engaged portion 28 provided on the surface of the movable portion 25 opposite to the surface on which the image sensor 23 is arranged, and the position of the engaging portion 50 is The first position restricts movement with respect to the fixed portion 24.

At this time, the pressing portion 52b of the leaf spring member 52 comes into contact with the engaged portion 28, and elastically holds the engaged portion 28, that is, the movable portion 25, in the optical axis OA direction.
Here, when the engaged portion 28 enters the concave portion 51 of the engaging portion 50, the space between the opposed inner peripheral surface 28 b and the outer peripheral surface 51 a, and the opposed inner surface 51 b and the outer surface 28 c The movement of the engaged portion 28 in the XY plane is prevented by the frictional force of the leaf spring member 52 because there is a gap between them. The movement of the engaging portion 28 is restricted to the inside of the concave portion 51.
Therefore, the engaged portion 28 is securely held without being excessively restrained by the engaging portion 50.

Further, the pressing portion 52b of the leaf spring member 52 comes into contact with the engaged portion 28, and the engaged portion 28, that is, the movable portion 25 is elastically held in the optical axis OA direction. The movable section 25 can be held in a state where the pressing in the OA direction is suppressed, and the movement of the movable section 25 in the optical axis OA direction can be suppressed. This makes it possible to maintain the position of the image sensor 23 in the direction of the optical axis OA with high accuracy while the movement of the movable part 25 including the image sensor 23 in the XY plane direction is restricted by the movement restricting mechanism 40.

Since the movable portion 25 is engaged with the engaged portion 28 at three places on the back surface and the movement with respect to the fixed portion 24 is restricted, compared with the case where the movable portion 25 is held at one place, It is kept stable.
Although the embodiment has been described in the form of holding at three places, the present invention is not limited to three places and may be three or more.

The engaging portion 50 is driven back and forth by a motor 49. Here, a worm gear is constituted by the worm gear 49 a of the rotating shaft of the motor 49 and the gear teeth 42 a of the gear portion 42, and the engaging portion 50 is engaged with the engaged portion 28 to form the movable portion 25. In a state where the movement with respect to the fixed portion 24 is restricted, the projection 47b of the moving plate 47 is in contact with the top dead center (or bottom dead center) of the slope 43b of the cam plate 43.
Therefore, even when the power is off, the movable section 25 including the imaging element 23 is fixed, so that the movable section 25 does not drop due to gravity or move due to the vibration of the portable device.
Therefore, the movable section 25 including the imaging element 23 can be held without consuming power.
Note that the movement limiting operation of the movable unit 25 may be performed not only when the main power is turned off but also such that the photographer can select and operate the operation unit 15. Further, the movement restriction operation of the movable unit 25 may be automatically performed depending on the shooting mode.
Further, in the above-described embodiment, the concave portion 51 is provided with the leaf spring member 52, and the pressing portion 52 b of the leaf spring member 52 comes into contact with the engaged portion 28 and friction between the pressing portion 52 b and the engaged portion 28. The configuration has been described in which a force is generated to limit the movement of the movable portion 25 provided with the engaged portion 28 in the XY plane. Separately from this, for example, an inelastic member that comes into contact with the engaged portion 28 is provided at the end of the leaf spring member 52. It is good also as a structure provided. Even with such a configuration, the movable member 25 can be held in a state in which the elastic member bends and the pressing of the movable unit 25 in the optical axis OA direction is suppressed, and the movable unit 25 can be held in the optical axis OA direction. Can be suppressed. Accordingly, it is possible to maintain the position of the image sensor 23 in the optical axis OA direction with high accuracy in a state where the movement of the movable part 25 including the image sensor 23 in the XY plane direction is restricted by the movement restriction mechanism 40.

In the embodiment, since the movement restriction mechanism 40 is disposed in the space on the back side of the imaging unit 20, the space on the back side of the imaging unit 20 can be effectively used. Therefore, since the internal space of the camera 1 can be effectively used, the size of the camera 1 can be reduced.

In the embodiment, when the holding center does not coincide with the center of gravity of the movable portion, a rotational moment is applied at the time of holding according to the separation distance between the holding center and the center of gravity of the movable portion. Retention may be required.
However, in the embodiment, as shown in FIGS. 2 and 3, the axis G <b> 1 passing through the holding center of the movement restricting mechanism 40 is disposed so as to pass through a position that substantially matches the center of gravity G. Therefore, the movable portion 25 is held at three points at substantially equal distances on the circumference around the center of gravity G of the movable portion 25. Since the holding center and the center of gravity G of the movable portion 25 are substantially coincident with each other, the holding force for pressing the movable portion 25 can be relatively small. In addition, the inclination of the movable portion 25 due to mechanical play (play) of each member can be reduced. The position of the engaged portion 28 with which the engaging portion 50 is engaged is set on the circumference centered on the center of gravity G of the movable portion 25, but is not strictly limited to the form centered on the center of gravity G. May be in the vicinity of the center of gravity G that is slightly shifted. For example, the position may be a position closer to the center of gravity G than the imaging center.

(4) When the imaging element 23 is pressed from the front side, the imaging surface cannot be blocked, so that it is difficult to hold a plurality of locations around the center of gravity G of the movable part 25. However, in the present embodiment, since the image sensor 23 is pressed from the back side, it is possible to hold a plurality of points around the center of gravity G.

In the voice coil motor according to the embodiment, the

magnets

311, 312, and 313 are provided in the fixed unit 24, and the

coils

211, 212, and 213 are provided in the movable unit 25. However, the present invention is not limited to this, and the magnet may be provided on the movable portion, and the coil may be provided on the fixed portion.
Further, in the embodiment, the engaged portion 28 enters the concave portion 51 of the engaging portion 50, but the movement restricting mechanism is not limited to this, and may be another type.

(2nd Embodiment)
Next, a second embodiment of the present invention will be described. Hereinafter, in the description of the second embodiment, the same reference numerals are used as in the first embodiment.
As in the first embodiment, the camera 1 of the second embodiment also includes an imaging unit 20 including an imaging element 23 as shown in FIG. 1, a movement restriction mechanism 40 for the imaging element 23 in the imaging unit 20, a release switch 11, , Display unit 12, blur detection sensor 13, first drive unit 21, position detection unit 22, and control unit 14.

The camera 1 has an acceleration sensor. Note that the acceleration sensor may be common to the shake detection sensor 13. Further, the movement restriction mechanism 40 of the second embodiment is not limited to the movement restriction mechanism 40 of the first embodiment, and may be another movement restriction mechanism 40. The position where the engaging portion 50 of the movement restricting mechanism 40 engages with the engaged portion 28 of the movable portion 25 is not limited to three, but may be two or one. A configuration that engages with the entire surface of the movable portion 25 may be used.

FIG. 10 is a flowchart illustrating the operation of the control unit 14 of the camera 1 according to the second embodiment.
In the second embodiment, when the acceleration detected by the acceleration sensor is 0 G for a certain period of time or longer (Step S1, YES), the controller 14 detects that the object is a free fall (Step S2).
When the free fall is detected, the control unit 14 restricts the movement of the movable unit by the movement restriction mechanism (step S3).
As described above, according to the second embodiment, when the fall of the camera 1 is detected, the movement of the movable part is restricted, so that the possibility that the movable part collides with another member and is damaged is reduced.

(Third embodiment)
Next, a camera as a third embodiment of the imaging apparatus will be described. The camera according to the third embodiment is the same as the camera 1 according to the first embodiment except for the movement restricting mechanism 140, and a description of the same parts will be omitted.

(Movement restriction mechanism 140)
The movement restriction mechanism 140 of the third embodiment is arranged in a space on the back side of the imaging unit 20 in the housing of the camera, as in the first embodiment.
FIG. 11 is an exploded perspective view of the movement restriction mechanism 140 as viewed obliquely from the front. FIG. 12 is an exploded perspective view of the movement restriction mechanism 140 as viewed obliquely from the rear. FIG. 13 is a rear view of the movement restriction mechanism 140. FIG. 14 is a front view of the movement restricting mechanism 140 at the first position restricting the movement of the engaged portion 28 (the movement of the movable portion 25 with respect to the fixed portion 24). FIG. 15 is a front view of the movement restricting mechanism 140 at the second position where the movement of the engaged portion 28 is not restricted. FIG. 16 is a perspective view of the movement restricting mechanism 140 in the first state restricting the movement of the engaged portion 28 as viewed from the front side. FIG. 17 is a perspective view of the movement restricting mechanism 140 in the second state in which the movement of the engaged portion 28 is not restricted, as viewed from the front side.

The movement restricting mechanism 140 is disposed on the base plate 141, the rotating plate 143 disposed on the rear side of the base plate 141, the gear part 142 disposed on the side of the base plate 141, and the front surface of the base plate 141. And a holding member 144.

(Base plate 141)
The base plate 141 has a substantially rectangular plate shape, as shown in FIGS. 12 and 13, a circular rotating plate holding recess 141b on the rear surface, a rotating plate holding shaft 141a extending rearward from the center of the rotating plate holding recess 141b, and a rotating plate. A gear holding recess 141d provided outside the holding recess 141b and a gear support shaft 141c extending rearward from the gear holding recess 141d are provided. The rotating plate holding shaft 141a extends along the axis G1, and the axis G1 is disposed so as to pass through a position substantially coincident with the center of gravity G of the movable portion 25.

On the bottom surface of the rotating plate holding recess 141b, three pin insertion slots 141e are provided penetrating at three equally spaced positions on the circumference around the axis G1.
Further, on the bottom surface of the rotary plate holding recess 141b, on the outer peripheral side of the three pin insertion slots 141e, three claw insertion slots 141f are provided at three equally spaced positions on the circumference around the axis G1. It is provided through.

As shown in FIGS. 11 and 14 to 17, on the front surface of the base plate 141, claw holding shafts 141i extending forward are provided at three equally spaced positions on the circumference around the axis G1. I have.
Further, spring holding projections 141g are provided at three equally spaced positions on the circumference around the axis G1. A coil spring 141h is inserted into each of the spring holding protrusions 141g.
Further, a motor 149 serving as a second driving unit, which is an actuator, is fixed to the front surface of the base plate 141. The rotation shaft of the motor 149 extends in the Y direction, and a worm gear 149a is attached to the outer periphery of the rotation shaft.

(Gear part 142)
The gear portion 142 is provided with first gear teeth 142a on the rear side of the outer periphery and second gear teeth 142b on the front side of the outer periphery. The gear portion 142 has a disk shape and is rotatably attached to a gear support shaft 141c whose center is provided on the base plate 141. The worm gear 149a of the motor 149 meshes with the second gear teeth 142b.

(Rotating plate 143)
The rotating plate 143 has an annular shape, and an insertion hole 143 a provided at the center is inserted into the rotating plate holding shaft 141 a of the base plate 141 and held in the rotating plate holding recess 141 b of the base plate 141 so as to be relatively rotatable. ing.
The rotating plate 143 has gear teeth 143b formed on a part of the outer periphery, and meshes with the first gear teeth 142a of the gear portion 142.
First holding claws 143c extending radially outward are provided at three equally spaced locations on the outer periphery of the rotating plate 143. The first holding claw 143c includes a first holding surface 143d extending in the radial direction.
The first holding claw 143c is inserted into a claw insertion slot 141f provided in the base plate 141, and moves in the claw insertion slot 141f in the circumferential direction by rotation of the rotating plate 143. Further, a pin member 143e extends forward from three equally spaced locations on the circumference centered on the axis G1 on the front surface of the rotating plate 143.

(Holding member 144)
The three holding members 144 are provided and have the same shape. The respective holding members 144 are arranged at equal intervals along the circumference around the axis G1.
The holding member 144 includes a rotation center hole 144a, an arm 144b extending in a circumferential direction from a portion where the rotation center hole 144a is provided, and a second holding claw 144c extending radially outward from a tip end of the arm 144b. Prepare.
The claw holding shaft 141i of the base plate 141 is inserted into the rotation center hole 144a, and the holding member 144 is rotatable around the claw holding shaft 141i.
A surface on the radially inner side of the arm portion 144b is a cam surface 144e. A pin member 143e provided on the rotary plate 143 penetrates the pin insertion slot 141e of the base plate 141 and is in contact with the cam surface 144e.
Further, a spring engaging portion 144f is provided in a portion of the arm portion 144b opposite to the rotation center hole 144a. One end of a coil spring 141h attached to a spring holding projection 141g of the base plate 141 abuts against the spring engaging portion 144f, and the holding member 144 is turned around the rotation center hole 144a by the coil spring 141h in FIG. Energized clockwise.
The second holding claw 144c is provided with a second holding surface 144d facing the rotation center hole 144a.
When the holding member 144 rotates about the claw holding shaft 141i, the second holding surface 144d moves between a position retracted from the front side of the claw insertion slot 141f and a state in which it enters the front side of the claw insertion slot 141f.

(motion)
(Second position)
At the time of photographing, as shown in FIGS. 13, 15, and 17, the movement restriction mechanism 140 is at the second position where the movement of the engaged portion 28 described in the first embodiment is not restricted.

(Position of first holding surface 143d)
In the second position shown in FIG. 13, the first holding surface 143d is at a position retracted from the back surface of the nail insertion slot 141f.

(Position of second holding surface 144d)
As shown in FIGS. 15 and 17, the pin member 143e is located on the rotation center hole 144a side of the cam surface 144e of the holding member 144.
The spring engaging portion 144f is urged by the coil spring 141h, and is urged counterclockwise in the drawing around the rotation center hole 144a (claw holding shaft 141i), that is, in a direction in which the tip of the cam surface 144e approaches the axis 1G. ing.
For this reason, the second holding surface 144d is located at the second position retreated from the claw insertion long hole 141f, that is, separated from the engaged portion 28.

(First position)
(Position of first holding surface 143d)
For example, when the main power of the camera is turned off by the photographer, the motor 149 fixed to the base plate 141 rotates before the power is completely turned off.
Then, the worm gear 149a of the rotating shaft of the motor 149 meshes with the first gear teeth 142a of the gear portion 142, and the rotational force of the motor 149 is transmitted to the gear portion 142, and the gear portion 142 is moved in the direction of arrow A1 shown in FIG. To rotate.
When the gear portion 142 rotates in the A1 direction, the rotating plate 143 rotates in the direction of the arrow A2 shown in FIG. 13 due to the engagement of the first gear teeth 142a and the gear teeth 143b.
When the rotating plate 143 rotates in the direction A2, the first holding surface 143d also moves about the rotating plate holding shaft 141a (G1) in the direction of the arrow A2 shown in FIGS. 13, 14, and 15.

(Position of second holding surface 144d)
When the rotating plate 143 rotates, the pin member 143e also moves in the circumferential direction indicated by an arrow A2 in FIGS. 14 and 15 around the rotating plate holding shaft 141a (G1). Then, the cam surface 144e is moved by the pin member 143e, and the holding member 144 rotates around the rotation center hole 144a (claw holding shaft 141i) against the force of the coil spring 141h.
When the holding member 144 rotates, the second holding surface 144d also moves about the rotation center hole 144a (claw holding shaft 141i) in the direction of arrow A3 shown in FIG.
Thereby, the second holding surface 144d and the first holding surface 143d move in a direction approaching each other on the XY plane, and the engaged portion 28 is sandwiched between the second holding surface 144d and the first holding surface 143d. The state becomes 14.

In the first embodiment, the pressing portion 52b of the leaf spring member 52 comes into contact with the engaged portion 28, and the engaged portion 28, that is, the movable portion 25 is elastically held in the optical axis OA direction. However, in the third embodiment, the engaged portion 28, that is, the movable portion 25 is pressed by the holding member 144 from the direction of the XY plane orthogonal to the optical axis OA. Therefore, the movable section 25 can be held without being pressed in the direction of the optical axis OA, and the movement of the movable section 25 in the direction of the optical axis OA can be suppressed. This makes it possible to maintain the position of the image sensor 23 in the optical axis OA direction with high accuracy in a state where the movement of the movable part 25 including the image sensor 23 in the XY plane direction is restricted by the movement restricting mechanism 140.

Further, similarly to the first embodiment, the movable portion 25 including the image sensor 23 is fixed even in the power-off state, so that the movable portion 25 does not fall due to gravity or move due to the vibration of carrying. Therefore, the movable section 25 including the imaging element 23 can be held without consuming power.

As in the first embodiment, the movement restriction mechanism 140 described in the third embodiment is disposed in the space on the back side of the imaging unit 20, so that the space on the back side of the imaging unit 20 can be effectively used. it can. Therefore, since the internal space of the camera 1 can be effectively used, the size of the camera 1 can be reduced.

Similar to the first embodiment, in the third embodiment, the holding center and the center of gravity G of the movable portion 25 substantially match, so that the holding force for pressing the movable portion 25 can be relatively small. In addition, the inclination of the movable portion 25 due to mechanical play (play) of each member can be reduced.

As in the first embodiment, when the imaging element 23 is pressed from the front side, the imaging surface cannot be blocked, so that it is difficult to hold a plurality of locations around the center of gravity G of the movable part 25. However, in the third embodiment, since it is pressed from the back side of the image sensor 23, it is possible to hold a plurality of points around the center of gravity G.

In the third embodiment described above, in the chair coil motor, the

magnets

311, 312, 313 are provided in the fixed part 24, and the

coils

211, 212, 213 are provided in the movable part 25. However, the present invention is not limited to this, and the magnet may be provided on the movable portion, and the coil may be provided on the fixed portion.

In the above-described third embodiment, the movable portion 25 includes the three engaged portions 28, and the three engaged portions 28 are respectively held by the holding members 144 from the direction of the XY plane orthogonal to the optical axis OA. The configuration has been described. Alternatively, the movable portion 25 may be provided with one engaged portion 28, and the one engaged portion 28 may be held by the holding member 144 from the direction of the XY plane. Even with such a configuration, it is possible to hold the movable portion 25 without pressing the movable portion 25 in the optical axis OA direction, and it is possible to suppress the movement of the movable portion 25 in the optical axis OA direction. It becomes possible. This makes it possible to maintain the position of the image sensor 23 in the direction of the optical axis OA with high accuracy.

In the third embodiment described above, the configuration in which the engaged portion 28 provided on the movable portion 25 is sandwiched and held by the holding member 144 has been described. Separately from this, for example, a concave engaged portion is provided on the movable portion 25 instead of the convex engaged portion, and a force is applied to the concave engaged portion from the inside by a holding member in the XY plane. It may be configured to hold down. Even with such a configuration, it is possible to hold the movable portion 25 without pressing the movable portion 25 in the optical axis OA direction, and it is possible to suppress the movement of the movable portion 25 in the optical axis OA direction. It becomes possible. This makes it possible to maintain the position of the image sensor 23 in the direction of the optical axis OA with high accuracy.

Although the preferred embodiments have been described above, various modifications and changes are possible without being limited to these embodiments.

G: center of gravity, G1: axis, OA: optical axis, 1: camera, 13: blur detection sensor, 14: control unit, 20: imaging unit, 21: first drive unit, 22: position detection unit, 22a: hole Element, 22b: magnet for position detection, 23: imaging element, 24: fixed part, 24a: fixed side opening, 25: movable part, 26: movable frame, 26a: movable side opening, 27: arm, 28: Engaged part, 28a: abutting surface, 28b: inner peripheral surface, 28c: outer surface, 30: fixed frame, 40: movement limiting mechanism, 41: base plate, 41a: moving plate holding shaft, 41b: cam plate holding Ring, 41c: gear support shaft, 41d: receiver, 42: gear part, 42a: gear teeth, 43: cam plate, 43a: cam gear teeth, 43b: slope, 44: spring, 45: biasing spring, 46: cover plate , 46b: projection, 47: moving plate, 47a: Stopping, 49: motor, 49a: screw portion, 50: engaging portion, 51: concave portion, 51a: outer peripheral surface, 51b: inner surface, 52: leaf spring member, 52a: both ends, 52b: pressing portion, 211: coil , 212: coil, 213: coil, 214: yoke, 311: magnet, 312: magnet, 313: magnet 140: movement limiting mechanism, 141: base plate, 141a: rotating plate holding shaft, 141b: rotating plate holding concave portion, 141c : Gear supporting shaft, 141d: gear holding recess, 141e: pin insertion long hole, 141f: claw insertion long hole, 141g: spring holding projection, 141h: coil spring, 141i: claw holding shaft, 142: gear portion, 142a: No. 1 gear tooth, 142b: second gear tooth, 143: rotating plate, 143a: insertion hole, 143b: gear tooth, 143c: first holding claw, 143d: first holding Surface, 143e: pin member, 144: holding member, 144a: rotation center hole, 144b: arm, 144c: second holding claw, 144d: second holding surface, 144e: cam surface, 144f: spring engaging portion, 149: motor, 149a: worm gear

Claims

An imaging element is arranged, and a movable portion movably provided;
A first drive unit for moving the movable unit;
A first position for restricting the movement of the movable portion by engaging with an engaged portion provided on a surface of the movable portion opposite to the surface on which the imaging element is arranged; An engagement portion movable in a second position that does not limit the movement of the movable portion and does not limit;
A second drive section for moving the engagement section between the first position and the second position;
An imaging device comprising:
The second drive unit includes an actuator that moves the engagement unit between the first position and the second position,
The imaging device according to claim 1, wherein at least a part of the actuator is located on a side of the movable portion opposite to a surface on which the imaging element is arranged.
With a fixed part,
The movable portion is provided so as to be movable with respect to the fixed portion,
3. The voice coil motor according to claim 2, wherein the first driving unit includes a coil disposed on one of the fixed unit and the movable unit, and a magnet disposed on the other of the fixed unit and the movable unit. An imaging device according to item 1.
4. The imaging device according to claim 3, further comprising a plurality of the voice coil motors arranged asymmetrically with respect to an imaging center of the imaging device.
5. The imaging device according to claim 3, wherein the actuator is arranged at a position that does not overlap with the voice coil motor in a direction perpendicular to an imaging surface of the imaging device.
The imaging device according to any one of claims 1 to 5, further comprising at least three of the engagement portions.
The imaging device according to claim 6, wherein the engaged portions to which at least three of the engaging portions are respectively engaged are located at equal positions from near the center of gravity of the movable portion.
An imaging element is arranged, and a movable portion movably provided;
A first drive unit for moving the movable unit;
A first position for engaging the engaged portion provided on the movable portion and restricting the movement of the movable portion, and a second position for not engaging the engaged portion and restricting the movement of the movable portion. At least three engagement portions provided so as to be movable between positions;
A second drive section for moving the engagement section between the first position and the second position;
An imaging device comprising:
The imaging device according to claim 8, wherein the engaged portions with which the at least three engaging portions are respectively engaged are at equal positions from near the center of gravity of the movable portion.
With a fixed part,
The movable portion is provided so as to be movable with respect to the fixed portion,
9. The voice coil motor having a coil disposed on one of the fixed part and the movable part, and a magnet disposed on the other of the fixed part and the movable part. Or the imaging device according to 9.
The imaging device according to any one of claims 8 to 10, wherein a plurality of the engaged portions are provided, and are provided on the same circumference centered on a position separated from an imaging center of the imaging element.
12. The electronic device according to claim 1, further comprising: a first elastic member that urges the engaging portion in a direction away from the engaged portion when the engaging portion contacts the engaged portion. 13. An imaging device according to item 1.
A base plate for holding the second drive unit,
A cam plate having a cam surface which is rotated about an axis parallel to the optical axis by the second drive unit and whose axial thickness gradually changes;
A moving plate provided with a cam follower that is in contact with the cam surface, which is advanced and retracted in the axial direction by the rotation of the cam plate, and wherein the engaging portion is provided on a radially outer diameter side centered on the axis; When,
A second elastic member that urges the moving plate toward the base plate;
The imaging device according to claim 1, further comprising: a cover plate fixed to the base plate.
An imaging element is disposed, and a movable unit provided to be movable in a direction parallel to an imaging surface of the imaging element with respect to a fixed unit,
The engaged portion provided on the surface of the movable portion opposite to the surface on which the imaging element is disposed is pressed from a direction perpendicular to the imaging surface via an elastic member, and the imaging of the movable portion is performed by a frictional force. A restricting portion that restricts movement in a direction parallel to the surface,
An imaging device comprising:
An imaging element is disposed, and a movable unit provided to be movable in a direction parallel to an imaging surface of the imaging element with respect to a fixed unit,
A limiting unit that limits the movement of the movable unit by pressing an engaged portion provided on a surface of the movable unit opposite to the surface on which the imaging element is arranged, in a direction parallel to the imaging surface;
An imaging device comprising:
16. The imaging apparatus according to claim 15, wherein the movable unit has at least three or more engaged parts provided at equal positions from near the center of gravity of the movable unit.
A first drive unit configured to move the movable unit and the fixed unit,
16. The voice coil motor, wherein the first drive unit includes a coil disposed on one of the fixed unit and the movable unit, and a magnet disposed on the other of the fixed unit and the movable unit. Or the imaging device according to 16.
A first position for restricting the movement of the movable portion by pressing the restricted portion from a direction parallel to the imaging surface, and restricting a movement of the movable portion without pressing the engaged portion; The imaging apparatus according to any one of claims 15 to 17, further comprising a second drive unit configured to move between a second position and a second position.
The second drive unit includes an actuator that moves the restriction unit between the first position and the second position,
19. The imaging device according to claim 18, wherein at least a part of the actuator is located on a side of the movable unit opposite to a surface on which the imaging element is arranged.