JP2017037098A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow inexpensive and effective camera shake correction by reducing the number of sensors and the number of actuators without using expensive sensors.SOLUTION: An imaging apparatus 1 comprises: an image pick-up device 10; a movable frame 2 on which the image pick-up device 10 is fixed; and a base member 3 freely movably supporting the movable frame 2 along an imaging surface 10A of the image pick-up device 10. On the base member 3, a shaft member 4 is provided extending in an uniaxial direction along the imaging surface 10A, with both ends (4A, 4B) of the shaft member 4 being freely movably held in a direction intersecting with the uniaxial direction. The movable frame 2 engages with the shaft member 4 and has an engaging part 2B that is freely movable along the shaft member 4. A drive part 5 is provided between the movable frame 2 and the base member 3, which detects a camera shake and moves the movable frame 2 with respect to the base member 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an imaging apparatus having a camera shake correction function.

  Conventionally, as an imaging device with camera shake correction function, the stage on which the image sensor is fixed is supported so that it can move and rotate in a plane along the imaging surface, and the camera shake is corrected by moving it so as to cancel the camera shake during shooting. doing. In order to perform this correction, a sensor for detecting camera shake is provided, and an actuator for moving and rotating the stage by the output of the sensor is provided. For example, a vibration gyro is used as the sensor, and a voice coil motor (VCM) or the like is used as the actuator. The stage on which the image sensor is fixed is supported via a plurality of balls on a housing surface (perpendicular to the optical axis of the optical system that forms an image on the imaging surface) along the imaging surface, and can move and rotate in a plane. It has become.

JP 2005-184122 A

  In the above-described prior art, since it is considered to correct camera shake in various directions, the stage on which the image sensor is fixed can be translated and rotated in a plane orthogonal to the optical axis, and the stage around the optical axis can be rotated. A means for detecting rotation is required. For this reason, an expensive sensor such as a vibration gyroscope is required, and the number of sensors and the number of actuators are increased, which also causes a problem that the cost must be increased.

  This invention makes it an example of a subject to cope with such a problem. That is, it is an object of the present invention to reduce the number of sensors and the number of actuators without using an expensive sensor and to enable inexpensive and effective camera shake correction.

In order to achieve such an object, the present invention has the following configuration.
An imaging device, a movable frame to which the imaging device is fixed, and a base member that supports the movable frame movably along the imaging surface of the imaging device. The shaft member extends in a uniaxial direction, and both end portions of the shaft member are held movably in a direction intersecting the uniaxial direction. The movable frame engages with the shaft member, and is attached to the shaft member. An engaging portion that is movable along a movable portion, and a drive portion that detects a camera shake and moves the movable frame relative to the base member is provided between the movable frame and the base member. An imaging device.

  In the present invention having such a feature, the moving direction of the movable frame to which the imaging element is fixed is restricted to the direction along the shaft member and the direction intersecting the shaft member. Therefore, the number of sensors can be reduced without using an expensive sensor. In addition, the number of actuators can be reduced and inexpensive and effective camera shake correction can be performed.

1 is an exploded perspective view of an imaging apparatus according to an embodiment of the present invention. It is an assembly sectional view of an imaging device concerning an embodiment of the present invention. 1 is a schematic plan view of an imaging apparatus according to an embodiment of the present invention. They are AA sectional drawing in FIG. 3 (FIG.4 (a)) and BB sectional drawing (FIG.4 (b)). It is sectional drawing which showed the structural example of the camera provided with the imaging device which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show an imaging apparatus according to an embodiment of the present invention. The imaging device 1 includes an imaging element 10, a movable frame 2, a base member 3, a shaft member 4, and a drive unit 5. In the figure, the Z direction is the optical axis direction, and the X direction and the Y direction indicate directions orthogonal to each other within a plane orthogonal to the Z direction.

  The imaging element 10 is fixed to the movable frame 2 and moves together with the movable frame 2, and a captured image is imaged on an imaging surface 10 </ b> A by an imaging optical system (not shown) provided separately. An image signal output from the image sensor 10 is transmitted to an image processing device or a display device (not shown).

  The movable frame 2 is a plate-like member that extends along the imaging surface 10A. The movable frame 2 includes an imaging device fixing portion 2A that fixes the imaging device 10 on one surface, and the engaging portion 2B on the other surface. Prepare. Further, two attachment openings 2C are opened.

  The base member 3 supports the movable frame 2 so as to be movable along the imaging surface 10A of the imaging element 10. The base member 3 has a uniaxial direction (Y direction shown in the drawing) along which the shaft member 4 extends along the imaging surface 10A. ), And both end portions 4A and 4B of the shaft member 4 are held so as to be movable in a direction intersecting the uniaxial direction (X direction in the drawing).

  As shown in FIG. 4A, the engaging portion 2B included in the movable frame 2 is engaged with the shaft member 4. That is, the engaging portion 2 </ b> B has a V-shaped tapered surface 2 </ b> B <b> 1, and the tapered surface 2 </ b> B <b> 1 is in contact with the outer periphery of the shaft member 4 to engage with the shaft member 4. The engaging portion 2B is movable along the axial direction (Y direction in the drawing) of the shaft member 4, and thereby the movable frame 2 is supported so as to be movable in the axial direction (Y direction in the drawing) of the shaft member 4. .

  The shaft member 4 is held movably with respect to the base member 3. The end portions 4A and 4B of the shaft member 4 are held so as to be slidable in the X direction in the drawing while being in contact with the holding surfaces of the sliding holding portions 3A and 3B of the base member 3. Thus, the movable frame 2 engaged with the shaft member 4 is supported so as to be movable in a direction (X direction in the drawing) intersecting the axial direction of the shaft member 4.

  The movable frame 2 is supported by the base member 3 via the rolling elements 6. The rolling element 6 is, for example, a ball bearing. When the movable frame 2 moves on the rolling element 6, the imaging surface 10A of the imaging element 10 fixed to the movable frame 2 can always move on a certain plane. It is like that. The rolling element 6 allows the movable frame 2 to move not only in the X direction and the Y direction, but also in the rotational direction (θ (theta) direction) in the XY plane. Thus, it is possible to provide an imaging apparatus capable of correcting a camera shake in various directions.

  As shown in FIG. 4B, the movable frame 2 includes a rolling element restricting portion 2 </ b> D that restricts the moving range of the rolling element 6. The rolling element restricting portion 2D prevents the rolling element 6 from coming off between the movable frame 2 and the base member 3 during a drop impact or the like.

  A drive unit 5 is provided between the movable frame 2 and the base member 3 to detect camera shake and move the movable frame 2 relative to the base member 3. The drive unit 5 includes a pair of magnets 5A and 5B fixed to the movable frame 2 side and a pair of coils 5C and 5D fixed to the base member 3 side.

  The pair of magnets 5A and 5B are attached to the attachment opening 2C of the movable frame 2 and have magnetization directions orthogonal to each other along the imaging surface 10A. In the illustrated example, the magnet 5A is magnetized along the X direction, and the magnet 5B is magnetized along the Y direction.

  The pair of coils 5C and 5D are attached to the base member 3 through the holding member 7 so as to face the pair of magnets 5A and 5B, respectively, and the straight portions 5C1 and 5C1 that intersect the magnetization direction of the pair of magnets 5A and 5B. 5D1 respectively. That is, the straight portion 5C1 of the coil 5C extends in the Y direction in the drawing, and the straight portion 5D1 of the coil 5D extends in the X direction in the drawing.

  A pair of Hall sensors 5E and 5F are arranged at positions facing the magnets 5A and 5B in the base member 3. The hall sensors 5E and 5F detect the movement of the movable frame 2 due to camera shake by the magnetic movement of the magnets 5A and 5B. The camera shake correction is performed by inputting the drive current to the coils 5C and 5D so as to cancel the camera shake detected by the outputs of the hall sensors 5E and 5F.

  In such an imaging apparatus 1, the movement of the movable frame 2 caused by camera shake is restricted in the direction (X direction) that intersects the axial direction (Y direction in the drawing) of the shaft member 4 and the axial direction of the shaft member 4. . As a result, the drive unit 5 needs only a pair of magnets 5A, 5B and a pair of coils 5C, 5D for moving the movable frame 2 in two axial directions on the plane, and the number of actuators is minimized. Also, the sensors for detecting the movement of the movable frame 2 may be only the pair of hall sensors 5E and 5F, and the number of sensors is pushed to a minimum by using an inexpensive sensor.

  Thus, by reducing the number of members of the drive unit 5 as much as possible, for example, the moving space of the movable frame 2 is expanded, and the movable frame 2 can easily move not only in the X direction and the Y direction but also in the θ (theta) direction. Therefore, the camera shake detection range of the movable frame 2 is widened, and the camera shake correction can be functioned more effectively. As a result, it is possible to increase the resolution of images and moving images taken by the camera 100 including the imaging device 1.

  FIG. 5 shows a camera 100 including the imaging device 1. In the camera 100, a lens barrel 101 is arranged with respect to the imaging device 1 described above. The lens barrel 101 includes an objective lens 101A, a prism 101B, and relay lenses 101C to 101G. According to such a camera 100, it is possible to effectively provide a camera shake correction function at a relatively low cost.

1: imaging device, 10: imaging device, 10A: imaging surface,
2: movable frame, 2A: imaging element fixing portion, 2B: engaging portion, 2B1: tapered surface 2B1,
2C: mounting opening, 2D: rolling element regulating portion,
3: Base member, 3A, 3B: Sliding holding part,
4: Shaft member, 4A, 4B: end,
5: Drive unit, 5A, 5B: Magnet,
5C, 5D: Coil, 5C1, 5D1: Straight portion,
5E, 5F: Hall sensor,
6: Rolling element (ball bearing), 7: Holding member,
100: camera, 101: lens barrel, 101A: objective lens,
101B: Prism, 101C to 101G: Relay lens

Claims (4)

An image sensor, a movable frame to which the image sensor is fixed, and a base member that supports the movable frame movably along the imaging surface of the image sensor;
The base member has a shaft member extending in a uniaxial direction along the imaging surface, and both end portions of the shaft member are held movably in a direction intersecting the uniaxial direction,
The movable frame includes an engaging portion that engages with the shaft member and is movable along the shaft member;
An imaging apparatus, wherein a drive unit that detects camera shake and moves the movable frame relative to the base member is provided between the movable frame and the base member.   The imaging apparatus according to claim 1, wherein the movable frame includes a rolling element restricting unit that is supported by the base member via a rolling element and restricts a moving range of the rolling element.   The drive unit is fixed to the movable frame side and attached to the base member side facing a pair of magnets having a magnetization direction orthogonal to each other along the imaging surface, The imaging apparatus according to claim 1, further comprising a coil having a linear portion that intersects the magnetization direction.   The camera provided with the imaging device described in any one of Claims 1-3.

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