JP6005984B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus having a mechanism for moving an imaging element.

  As an imaging device that captures a still image or a moving image, a device having a so-called blur correction function that prevents a subject from blurring in an image by moving a lens or an imaging element in accordance with the movement of the imaging device is known. For example, International Publication No. WO2006 / 075545 discloses a camera shake correction apparatus that moves a lens module having a lens and an image sensor.

  In International Publication No. WO2006 / 075545, a flexible printed circuit board is formed by forming a U-shaped bent portion on a flexible printed circuit board for electrically connecting the image pickup element to another electric circuit. It is possible to deform in accordance with the movement of.

  As disclosed in International Publication No. WO2006 / 075545, in an imaging apparatus that moves an image sensor, it is preferable that the amount of force necessary for deformation of the flexible printed circuit board that deforms as the image sensor moves is smaller. If the amount of force required for deformation of the flexible printed circuit board is small, the load when driving the image sensor is reduced. For example, the actuator that drives the image sensor can be downsized.

  To reduce the amount of force required to deform the flexible printed circuit board that deforms as the image sensor moves, the flexible printed circuit board is made thin and flexible, and the length of the deformed portion of the flexible printed circuit board A method to lengthen the length is considered.

  For example, in the imaging apparatus disclosed in Japanese Patent Application Laid-Open No. 2012-032543, a flexible printed circuit is formed by forming two bent portions that are folded back in a U shape on a flexible printed circuit board that is electrically connected to the imaging element. The length of the deformed portion of the substrate is increased.

International Publication Number WO2006 / 075545 JP 2012-032543 A

  When the flexible printed circuit board is thinned in order to reduce the amount of force required for the deformation of the flexible printed circuit board, the strength of the flexible printed circuit board is reduced, so that the flexible printed circuit board is easily damaged during assembly. When downsizing the image pickup apparatus, it is particularly difficult to handle the flexible printed circuit board having low strength without damaging it.

  In addition, when the length of the deformed portion of the flexible printed circuit board is increased, if the elongated portion comes into contact with another member, the load when driving the image sensor increases. It is necessary to accommodate the printed circuit board so as not to come into contact with other members. For this reason, the space for accommodating the flexible printed circuit board is increased, and the imaging apparatus is increased in size.

  The present invention has been made in view of the above-described points, and an object of the present invention is to make an imaging apparatus including a shake correction mechanism unit that moves an imaging element small and easy to assemble.

An imaging device of one embodiment of the present invention includes a fixed frame, a moving frame that is movably disposed with respect to the fixed frame, an actuator that drives the moving frame, an imaging element fixed to the moving frame, and the imaging An image pickup apparatus including a flexible printed circuit board electrically connected to an element, wherein the flexible printed circuit board extends from a base end portion in which a relative position with respect to the image pickup element is fixed. And an extending portion that extends without touching other members until reaching the fixed portion fixed to the fixed frame,
The extension part includes a slit hole extending in the extension direction of the extension part , and two positions spaced in the extension direction of the extension part, and is orthogonal to the extension direction of the extension part. The extension part is bent at an obtuse angle so as to be a valley fold when viewed from the image sensor, and a pair of bent parts intersecting the slit hole are formed.

  According to the present invention, it is possible to make the image pickup apparatus including the shake correction mechanism unit that moves the image pickup element small and easy to assemble.

It is a perspective view which shows the front side of a camera. The fragmentary sectional view which shows the back side of a camera. It is a perspective view which shows the back side of an imaging device. It is the elements on larger scale which show the back side of a shake amendment mechanism part. It is the elements on larger scale which show the side surface side of a blurring correction mechanism part. It is the elements on larger scale which show the bottom face side of a shake amendment mechanism part. It is the elements on larger scale which show the shape of the extension part of a flexible printed circuit board. It is the elements on larger scale which show the mode of a deformation | transformation of the extension part of a flexible printed circuit board. It is the elements on larger scale which show the mode of a deformation | transformation of the extension part of a flexible printed circuit board when an image pick-up element rotates. It is the elements on larger scale which show the mode of a deformation | transformation of the extension part of a flexible printed circuit board when an image pick-up element rotates.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each drawing used for the following description, the scale is different for each component in order to make each component large enough to be recognized on the drawing. It is not limited only to the quantity of the component described in the figure, the shape of the component, the ratio of the size of the component, and the relative positional relationship of each component.

  In the present embodiment, the present invention is applied to an image pickup apparatus that is generally provided in an electronic device having an image pickup function such as a digital camera or a video camera and has an image pickup element. In this embodiment, as an example, as shown in FIGS. 1 and 2, the imaging apparatus 1 includes an imaging element 2 such as a CCD or a CMOS sensor, and is disposed in the camera 101.

  Further, the imaging apparatus 1 of the present embodiment is configured to include an imaging optical system member such as a lens for forming a subject image. The imaging optical system member includes a prism 3 and has a form called an optical path reflection type, a bending optical system, a bending optical system, or the like in which an optical axis is bent by the prism 3. The imaging apparatus 1 of the present embodiment has a configuration in which light incident from the side facing the subject (front) of the camera 101 is bent by approximately 90 degrees by the prism 3 and is incident on the imaging element 2.

  In the following description, in the imaging optical system member, the optical axis from the subject to the prism 3 and reaching the reflecting surface of the prism 3 is referred to as a first optical axis O1, and reaches the imaging device 2 from the reflecting surface of the prism 3. The optical axis is referred to as the second optical axis O2.

  In addition, the imaging device 1 includes an aperture, a shutter, and an ND filter disposed on the second optical axis O2. The details of the configuration of the imaging optical system member, the diaphragm, the shutter, and the ND filter of the imaging apparatus 1 are well known, and detailed description thereof will be omitted.

  The form of the imaging optical system member is not limited to the present embodiment, and may be a form having no prism. Moreover, although the imaging device 1 of this embodiment is comprised including the imaging optical system member, the imaging device 1 is comprised so that an imaging optical system member can be attached or detached and the imaging optical system member can be replaced | exchanged. It may be.

  As will be described in detail later, the imaging device 1 is configured to include a blur correction mechanism unit 10 that holds the imaging device 2 in a movable manner. Such a blur correction mechanism unit 10 that moves the image sensor 2 is referred to as an image sensor shift type blur correction mechanism, for example.

  The camera 101 has a battery housing chamber (not shown) that houses the imaging device 1, the control device 103, and a power battery in a box-shaped housing 102. The control device 103 includes an arithmetic device (CPU), a storage device (RAM), an auxiliary storage device, an input / output device, a power control device, and the like. The operation of the camera 101 is performed based on a predetermined program. It has a configuration to control.

  As shown in FIG. 2, the imaging device 1 and the control device 103 include an imaging element flexible printed circuit board 20 (hereinafter referred to as an imaging element FPC 20) and a driving flexible printed circuit board 30 (hereinafter referred to as a driving FPC 30). Are electrically connected to each other. The image sensor FPC 20 and the drive FPC 30 are connected to connectors 103 b and 103 c provided on the control device 103 at the ends extending from the respective image sensors 1.

  The control device 103 is electrically connected to the image pickup device 2 included in the image pickup device 1 via the image pickup device FPC 20. The control device 103 controls the operation of the image pickup device 2 and outputs an image based on a signal output from the image pickup device 2. Generation is possible.

  Further, as will be described in detail later, the control device 103 is electrically connected to an actuator such as an electric motor and a sensor such as a photo interrupter provided in the imaging device 1 via the driving FPC 30. The number and form of actuators included in the imaging apparatus 1 are not particularly limited, but the actuators are used for driving the lens for focusing or changing the shooting magnification, in addition to those used for the shake correction mechanism unit 10. And those for driving an aperture, a shutter, an ND filter, and the like, are appropriately provided according to the specifications of the imaging apparatus 1. The photo interrupter is arranged to detect the initial position of at least some of these actuators.

  In addition, the control device 103 includes a movement detection unit 103 a that includes at least one of an acceleration sensor and a gyroscope and is configured to detect the movement of the camera 101. Information on the movement of the camera 101 detected by the movement detection unit 103a is used for operation control of a shake correction mechanism unit 10 (to be described later) of the imaging apparatus 1.

  On the front surface of the housing 102 of the camera 101, an opening 102a through which the optical axis of the imaging device 1 disposed therein passes, a flash light emitting device 104, and the like are provided. In the present embodiment, the opening 102a is provided with transparent glass. The camera 101 may have a barrier device that shields the opening 102a when the imaging apparatus 1 is not photographing.

  Operation members such as a release switch 105 and a power operation switch 106 are disposed on the upper surface of the housing 102. Although not shown, a lid for opening and closing the battery housing chamber is provided on the side surface or bottom surface of the housing 102.

  In addition, on the back surface of the housing 102, operation members for inputting an operation instruction of the camera 101, such as a dial switch, a button switch, and a touch sensor, are provided. Further, an image display device 107 that includes a liquid crystal display device, an EL display device, or the like and displays and outputs an image is provided on the rear surface of the housing 102.

  Next, the blur correction mechanism unit 10 of the imaging device 1 will be described. The blur correction mechanism unit 10 is disposed on the bottom surface side of the imaging device 1. The shake correction mechanism unit 10 has a configuration that holds the image pickup device 2 so as to be movable with respect to the optical axis of the image pickup optical system member.

  In the present embodiment, as an example, the blur correction mechanism unit 10 holds the image sensor 2 so as to be movable in two directions on a plane substantially orthogonal to the second optical axis O2. More specifically, as shown in FIG. 3, the shake correction mechanism unit 10 includes a second direction along the Z axis substantially parallel to the first optical axis O1 on the plane substantially orthogonal to the second optical axis O2. The imaging element 2 is configured to be movable in a direction along the Y axis substantially orthogonal to the Z axis on a plane substantially orthogonal to the optical axis O2. The Y axis and the Z axis are substantially parallel to the outer side of the pixel formation region of the image sensor 2.

  In addition to the directions along the Y axis and the Z axis, the shake correction mechanism unit 10 may be configured to be capable of rotating the imaging device 2 around the X axis substantially parallel to the second optical axis O2. Further, the imaging device 2 may be configured to be rotatable about the Y axis and the Z axis. The blur correction mechanism unit 10 includes the imaging element 2 for at least two of the five axes of the Y axis, the Z axis, the rotation axis around the X axis, the rotation axis around the Y axis, and the rotation axis around the Z axis. Any form may be used as long as it is moved.

  More specifically, the shake correction mechanism unit 10 of the present embodiment is arranged with a fixed frame 11 whose position is fixed with respect to the second optical axis O2, and is movable with respect to the fixed frame 11 along the Y axis. The first moving frame 12 is provided, and the second moving frame 13 is arranged on the first moving frame 12 so as to be movable along the Z axis.

  The fixed frame 11 only needs to have a form in which the position is fixed with respect to the second optical axis O2, and may be configured integrally with a housing that holds the imaging optical system member of the imaging device 1. Further, it may be configured to be separable from the housing of the imaging device 1.

  The first moving frame 12 is guided in the Y-axis direction by, for example, a linear guide shaft provided on the fixed frame 11. The second moving frame 13 is guided in the Z-axis direction by a linear guide shaft provided on the first moving frame 12.

  The image sensor 2 is fixed to the second moving frame 13. In this embodiment, as an example, the image sensor 2 is mounted on the image sensor mounting substrate 16, and the image sensor mounting substrate 16 is fixed to the second moving frame 13. That is, in the present embodiment, the image sensor 2 is fixed to the second moving frame 13 via the image sensor mounting substrate 16.

  Further, the shake correction mechanism unit 10 is provided with a first drive motor 14 and a second drive motor 15 which are actuators for driving the first moving frame 12 and the second moving frame 13 to the Y axis and the Z axis. Has been. The first drive motor 14 and the second drive motor 15 are respectively disposed at both ends in the direction along the Y axis on the bottom surface side where the image sensor 2 of the image capturing apparatus 1 is disposed.

  In this embodiment, as an example, the first drive motor 14 and the second drive motor 15 are electric motors that are fixed to the fixed frame 11 and configured to be capable of rotating the screw. It has the structure which converts into linear motion by the nut to match. The first drive motor 14 and the second drive motor 15 may be linear motors.

  A configuration in which the first moving frame 12 and the second moving frame 13 are supported so as to be movable along the Y axis and the Z axis, and the first moving frame 12 and the second moving frame 13 are driven along the Y axis and the Z axis. Since the configuration is the same as that of a known shake correction mechanism, detailed description thereof will be omitted.

  Note that the shake correction mechanism unit 10 of the present embodiment moves the imaging element 2 to the Y-axis by moving the two moving frames of the first moving frame 12 and the second moving frame 13 along the Y-axis and the Z-axis, respectively. However, the form of the blur correction mechanism unit 10 is not limited to this. For example, the blur correction mechanism unit 10 holds the image sensor with a moving frame that can translate and rotate on a plane orthogonal to the second optical axis O2, and the movement of the image sensor and the image sensor are driven by the driving force of the actuator. The positioning may be performed.

  The image pickup device 2 held movably by the shake correction mechanism unit 10 is electrically connected to the control device 103 via the image pickup device FPC 20.

  In the present embodiment, as shown in FIG. 3, the image sensor FPC 20 has a base end 20 b, which is one end, of which the relative position with respect to the image sensor 2 is fixed, and the other end. A certain tip 20 a is configured to be connectable to the connector 103 b of the control device 103. The imaging element FPC 20 is arranged so as to extend along the outer peripheral surface of the imaging device 1 from the base end portion 20b to the distal end portion 20a.

  In the present embodiment, as an example, the base end portion 20b of the imaging element FPC 20 is fixed to the imaging element mounting substrate 16 with an anisotropic conductive adhesive or the like. The base end portion 20b of the image sensor FPC 20 may be directly connected to the image sensor 2 without the image sensor mounting substrate 16 interposed therebetween. For example, the imaging device 2 may be mounted on the base end portion 20b of the imaging device FPC 20.

  In addition, the imaging element FPC 20 includes a fixed portion 20c fixed to a member fixed to the optical axis between the base end portion 20b and the distal end portion 20a. Then, the FPC 20 for the image sensor is in a state where the space from the base end portion 20b to the fixed portion 20c floats in the air without touching the other members constituting the image pickup device 1 except the image sensor mounting substrate 16. It is arranged.

  In the present embodiment, as an example, the fixing portion 20 c of the imaging element FPC 20 is fixed to the fixing frame 11 of the blur correction mechanism portion 10. In addition, the member to which the fixing portion 20c of the imaging element FPC 20 is fixed may be in a form that is fixed to a member fixed to the second optical axis O2 among the members constituting the imaging device 1, and in particular. It is not limited.

  The fixing portion 20c is attached to the fixing frame 11 by at least one of a force by adhesion using, for example, an adhesive tape, a double-sided adhesive tape, or an adhesive, or a mechanical force such as fitting, caulking, or screw fastening to the fixing frame 11. It is fixed.

  In other words, the FPC 20 for the image sensor extends from the base end portion 20b where the relative position with respect to the image sensor 2 is fixed, and does not touch many members until reaching the fixed portion 20c fixed to the fixed frame 11. It has the extending part 21 provided in this way.

  FIG. 7 is a partially enlarged perspective view showing the shape of the extending portion 21 from the fixed portion 11 of the imaging element FPC 20 to the other end portion 20b.

  More specifically, as shown in FIGS. 4 and 7, the side surface portion along the second optical axis O <b> 2 of the fixed frame 11 approaches the second optical axis O <b> 2 toward the bottom surface side where the imaging element 2 is provided. Thus, an adhesive surface 11a which is an inclined surface is formed. The adhesive surface 11a is provided on the object side (the upper side in FIG. 4) from the image pickup device 2. On the adhesive surface 11 a, a fixing portion 20 c of the imaging element FPC 20 is fixed by a double-sided adhesive tape 17.

  The extending portion 21 extending from the fixing portion 20c to the base end portion 20b that is a portion fixed to the imaging element mounting substrate 16 is formed to be bent at a substantially predetermined angle in a free state where no external force is applied. Three bent portions are provided. Such processing for making the flexible printed circuit board bent in a free state is generally referred to as forming.

  In the following description, the three bent portions of the extending portion 21 are denoted by reference numerals 21a, 21b, and 21c in order from the one closest to the fixed portion 20c. The bent portions 21a, 21b, and 21c are all formed so as to have a ridge line substantially parallel to the Z axis.

  The bent portion 21a closest to the fixed portion 20c is formed so that the ridge line faces the second optical axis O2. That is, the ridgeline of the bent portion 21a faces the inner side of the imaging device 1, and is in a mountain fold state as viewed from the second optical axis O2. Therefore, the extending part 21 faces the inside of the image pickup apparatus 1 from the fixed part 20c to the bent part 21a, and the other end part 20b side of the extended part 21 from the bent part 21a is outside the image pickup apparatus 1. Head for.

  The bent portions 21b and 21c are both obtuse or substantially right-angled, and are formed so that the ridge line faces away from the second optical axis O2. That is, the bent portion 21b faces the outside of the imaging device 1 and is in a valley-folded state when viewed from the second optical axis O2. By forming these two bent portions 21b and 21c, the extending portion 21 of the second drive motor 15 disposed at the end portion in the direction along the Y-axis on the bottom surface side of the imaging device 1 is provided. The base end portion 20b has a shape that extends around the outside and reaches the imaging element mounting substrate 16.

  As shown in FIGS. 5, 6, and 7, a slit hole 22 is formed in the extending portion 21 of the imaging element FPC 20 of the present embodiment so that the longitudinal direction is along the extending direction. ing. The slit hole 22 is formed so as to cover the three bent portions 21a, 21b, and 21c at the approximate center in the width direction of the extending portion 21. That is, the extending part 21 is divided into two in the width direction in the region where the three bent parts 21a, 21b and 21c are formed.

  In other words, the extended portion 21 of the imaging device FPC 20 of the present embodiment includes a slit hole 22 extending in the extending direction, and a plurality of bent portions 21a intersecting the slit hole 22 and arranged in the extending direction. , 21b and 21c are formed.

  A two-dot chain line in FIG. 4 shows a state of deformation of the extending portion 21 when the image pickup device 2 is driven in the Y-axis direction by the shake correction mechanism portion 10. FIG. 8 shows a state of deformation of the extending portion 21 when the image pickup device 2 is driven in the Y-axis direction by the shake correction mechanism portion 10.

  As shown in FIGS. 4 and 8, the extending portion 21 of the imaging element FPC 20 of the present embodiment can be deformed so that the proximal end portion 21 b follows the movement of the imaging element 2 by the blur correction mechanism portion 10. . Here, since the extension part 21 is deformed so that the bending angles thereof are changed mainly at the plurality of bent parts 21a, 21b, and 21c, a small amount of force is required at the time of deformation. In addition, since the slit portion 22 is formed in the extension portion 21, the width of the portion where the extension portion 21 is deformed is narrowed, so that the amount of force required at the time of deformation is further reduced.

  Therefore, it is possible to reduce the load applied to the shake correction mechanism unit 10 when driving the image sensor 2 without reducing the thickness of the image sensor FPC 20. Therefore, the imaging element FPC 20 can be made to have a thickness that can be easily handled during assembly work, and the imaging apparatus 1 can be easily assembled. In addition, since the load applied to the shake correction mechanism unit 10 when driving the image sensor 2 is low, the first drive motor 14 and the second drive motor 15 can be made small in size with low output.

  In addition, since the extending portion 21 does not require a U-shaped shape and can be deformed so that the base end portion 21b follows, the extending portion 21 is accommodated so as not to contact other members. It is possible to reduce the space for doing so. In the present embodiment, since the extending portion 21 has a shape that bends in a substantially L shape along the corner portion of the imaging device 1, the space necessary for disposing the extending portion 21 is as follows. There are few.

  As described above, the imaging apparatus 1 according to the present embodiment is configured to include the shake correction mechanism unit 10 that moves the imaging element 2, and is small and easy to assemble.

  In the present embodiment, as an example, as illustrated in FIG. 7, an electromagnetic wave absorbing sheet 23 made of an electromagnetic wave absorbing material is attached to the extending portion 21. The electromagnetic wave absorbing sheet 23 is attached to a position that does not overlap the slit hole 22 and the bent portions 21a, 21b, and 21c. Thus, the electromagnetic wave countermeasure of the imaging device 1 can be performed by sticking the electromagnetic wave absorbing sheet 23 to the imaging element FPC 20 extending to the outer peripheral portion of the imaging device 1.

  In the above-described embodiment, the shake correction mechanism unit 10 is configured to drive the imaging device 2 on a plane substantially orthogonal to the second optical axis O2. However, the configuration of the shake correction mechanism unit 10 is the present embodiment. It is not limited to. For example, as illustrated in FIGS. 9 and 10, the shake correction mechanism unit 10 may have a configuration that rotates the imaging device 2 around the Z axis and the Y axis that are substantially orthogonal to the second optical axis O2. Good. As described above, even when the blur correction mechanism unit 10 has a configuration for rotating the image sensor 2, the image sensor FPC 20 can be deformed with a small amount of force following the rotation of the image sensor 2.

  Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. The apparatus is also included in the technical scope of the present invention.

  The image pickup apparatus according to the present invention is not limited to the camera form described in the above-described embodiment, and is provided in an electronic apparatus such as a recording device, a portable communication terminal, a game machine, a digital media player, a clock, and a navigation device. Needless to say, it may be.

  As described above, the present invention is suitable for an imaging apparatus including a shake correction mechanism unit.

1 imaging device,
2 image sensor,
3 Prism,
10 Shake correction mechanism,
11 Fixed frame,
11a adhesive surface,
12 First moving frame,
13 Second moving frame,
14 first drive motor,
15 second drive motor,
16 Image sensor mounting substrate,
17 Double-sided adhesive tape,
20 Flexible printed circuit board for image sensor (FPC for image sensor),
20a end,
20b the other end,
20c fixing part,
21 Extension part,
21a bent part,
21b bent part,
21c bent part,
22 slit holes,
23 electromagnetic wave absorbing sheet,
30 Flexible printed circuit board for driving (FPC for driving),
101 camera,
102 housing,
102a opening,
103 control device,
103a movement detector,
103b connector,
103c connector,
104 flash light emitting device,
105 Release switch,
106 Power operation switch.

Claims (3)

A fixed frame, a movable frame arranged to be movable with respect to the fixed frame, an actuator for driving the movable frame, an image sensor fixed to the movable frame, and a flexible print electrically connected to the image sensor An imaging device including a circuit board,
The flexible printed circuit board extends from a base end portion where the relative position with respect to the imaging element is fixed, and extends without touching other members until reaching a fixing portion fixed to the fixing frame. Part
The extension part includes a slit hole extending in the extension direction of the extension part , and two positions spaced in the extension direction of the extension part, and is orthogonal to the extension direction of the extension part. An imaging apparatus, wherein the extension part is bent at an obtuse angle so as to be a valley fold when viewed from the imaging element, and a pair of bent parts intersecting the slit hole are formed.   The imaging apparatus according to claim 1, wherein an electromagnetic wave absorbing sheet made of an electromagnetic wave absorbing material is attached to the flexible printed circuit board at a position where the flexible printed circuit board does not overlap the slit hole and the bent portion. An imaging optical system member including a prism disposed so that a second optical axis incident on the imaging element is orthogonal to a first optical axis incident on the imaging device from a subject;
The fixed frame holds the imaging optical system member, and a rectangular cross-section including a short side parallel to the first optical axis and a long side orthogonal to the first optical axis has a cross section perpendicular to the second optical axis. It has a rectangular parallelepiped shape that becomes a shape,
The moving frame is disposed at one end of the fixed frame in a direction along the second optical axis,
The extended portion of the flexible printed circuit board has a ridge line parallel to the first optical axis after extending from the moving frame in a direction perpendicular to the first optical axis and the second optical axis. It reaches the fixed part fixed to the side surface consisting of the short side of the fixed frame through the bent part.
The imaging apparatus according to claim 1.

Images