JP2014045277A - Image pick-up apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the position of an image sensor from changing due to deformation of an adhesive, in an image pick-up apparatus having a configuration for fixing the image sensors with an adhesive.SOLUTION: In an image pick-up apparatus including a frame member to which image sensors are fixed with an adhesive, an image sensor holding part to which the frame member is fastened by means of a plurality of screws, a filter facing the light-receiving surface of the image sensor, and a seal member held between the light-receiving surface and the filter, a bias member generating a force for biasing the image sensor in a direction approaching the filter is fastened to the image sensor holding part, together with the frame member, by means of the plurality of screws and disposed on the reverse side of the frame member.

Description

  The present invention relates to an imaging device that fixes an imaging element at a predetermined position with an adhesive.

  When an imaging apparatus such as a digital camera having an imaging element is assembled, so-called tilt adjustment that adjusts the angle between the imaging optical system and the imaging element may be required. For example, in Japanese Patent No. 4802221, a plurality of shims are sandwiched between a frame member that holds an image pickup device and an image pickup device holding portion that is fixed to the main body of the image pickup apparatus, and the thickness of the shim is changed. Thus, a technique for adjusting the tilt is disclosed.

Japanese Patent No. 4802221

  In the imaging device, in order to prevent dust from adhering to the light receiving surface of the image sensor, a seal member such as rubber is sealed between the plate glass filter disposed on the front surface of the image sensor and the light receiving surface. It may stop. In this case, a force is always applied to the image sensor due to the elastic force of the seal member sandwiched between the filter and the image sensor. For this reason, for example, when the imaging device is fixed to the frame member with an adhesive, if the imaging device is placed in a high temperature environment for a long time, the adhesive is subject to creep deformation due to the elastic force of the seal member. The position of can change.

  The present invention has been made in view of the above-described points, and in an imaging apparatus having a configuration in which an imaging element is fixed with an adhesive, preventing a change in the position of the imaging element due to deformation of the adhesive. Objective.

  An imaging device of one embodiment of the present invention includes an imaging element, a printed circuit board on which the imaging element is mounted, a frame member in which the imaging element or the printed circuit board is fixed by an adhesive, and the frame member is fastened by a plurality of screws. An image sensor holding unit configured to hold the image sensor at a predetermined position, a plate-like filter fixed to the image sensor holding unit and disposed to face the light receiving surface of the image sensor, And an image pickup apparatus that includes a seal member that is sandwiched between the light receiving surface and the filter and seals the periphery of the light receiving surface, and is disposed on the opposite side of the image sensor holding unit with the frame member interposed therebetween. And a biasing member fastened to the image sensor holding part together with the frame member by the plurality of screws, the biasing member is made of an elastic member and fastened to the image sensor holding part State By Oite elastically deformable, at least one of the imaging element and the printed circuit board is configured to produce a biasing force for urging in a direction toward the filter.

  ADVANTAGE OF THE INVENTION According to this invention, in the imaging device which has a structure which fixes an image pick-up element with an adhesive agent, it is possible to prevent the change of the position of an image pick-up element by an adhesive agent deform | transforming.

It is a perspective view which shows the front side of an imaging device. It is a perspective view which shows the back side of an imaging device. It is a disassembled perspective view which shows the state which removed the rear cover of the imaging device. It is a perspective view of a lens-frame main-body part. It is the perspective view which looked at the lens-frame main-body part from the downward side. It is a bottom view of a lens-frame main-body part. It is the disassembled perspective view which decomposed | disassembled the image pick-up element moving mechanism part. It is a perspective view of X slider and an image sensor holding part. It is the perspective view which looked at the lens-frame main-body part from the downward side. It is a disassembled perspective view of the drive mechanism part moved to an image pick-up element holding part Y direction. It is a disassembled perspective view of the mechanism which fixes an image sensor to an image sensor holding part. It is XII-XII sectional drawing of FIG. It is a perspective view of an adjustment member. It is sectional drawing for demonstrating the relationship between an image pick-up element, a sealing member, a shim part, and a leaf | plate spring part. It is sectional drawing for demonstrating the relationship between an image pick-up element, a sealing member, a shim part, and a leaf | plate spring part at the time of making a shim part thin. It is sectional drawing for demonstrating the relationship between an image pick-up element when a shim part is thickened, a sealing member, a shim part, and a leaf | plate spring part. It is a perspective view which shows the modification of an adjustment member. It is a perspective view of the adjustment member of 2nd Embodiment. It is sectional drawing for demonstrating the relationship between an image pick-up element, a sealing member, a shim part, and a leaf | plate spring part in 2nd Embodiment.

  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.

(First embodiment)
In the present embodiment, the present invention is applied to an imaging apparatus generally called an electronic camera, a digital camera, or the like. The image pickup apparatus 1 according to the present embodiment shown in FIG. 1 holds an image pickup optical system member composed of a lens or the like for forming a subject image, and an image pickup element 96 disposed on the image formation surface of the image pickup optical system member. The lens barrel 20 is provided inside. Note that the image sensor 96 is an image sensor such as a CCD or CMOS sensor.

  The imaging optical system member includes a prism 35b, and has a form called a so-called optical path reflection type, a bending optical system, a bending optical system, or the like in which the optical axis is bent by the prism 35b. In the imaging apparatus 1 of the present embodiment, light incident from the side facing the subject (front) of the imaging apparatus 1 is bent by 90 degrees by a prism 35b which is a so-called right-angle prism and is incident on the light receiving unit of the imaging element 96. It has a configuration.

  In the following description, in the imaging optical system member, the optical axis from the subject to the prism 35b and reaching the reflecting surface of the prism 35b is referred to as a first optical axis O1, and the reflecting surface of the prism 35b reaches the imaging device 96. The optical axis is referred to as the second optical axis O2. In other words, in the imaging optical system member, the first optical axis O1 indicates the optical axis on the object side with respect to the reflecting surface of the prism 35b, and the second optical axis O2 indicates the optical axis on the image side with respect to the reflecting surface of the prism 35b. Refers to that.

  In the following description, as shown in FIG. 1, when the imaging apparatus 1 is held in a so-called upright position, the left-right direction of the camera is the X direction, the up-down direction orthogonal to the X direction is the Z direction, The front-rear direction perpendicular to the Z direction is taken as the Y direction. In the present embodiment, the erect position of the image pickup apparatus 1 refers to a case where the image pickup apparatus 1 is held so that the long side of the rectangular image picked up by the image pickup apparatus 1 is substantially parallel to the horizontal line in the image. I will call it. Further, in the Y direction, the subject side of the imaging apparatus 1 is the front, and the photographer side is the rear (back direction). The X direction, the Y direction, and the Z direction are generally also referred to as a width direction, a thickness direction, and a height direction of the imaging apparatus 1.

  Specifically, as shown in FIGS. 1, 2, and 3, the imaging apparatus 1 according to the present embodiment includes a front cover 2 and a rear cover 3 that are coupled in a state of facing each other as a box-shaped exterior body, and a front cover. 2 and the lens frame 20 accommodated inside the rear cover 3 and a camera control board 18.

  The front cover 2 is provided with a photographing aperture window 2d on the front surface, a light emission window 2e of a flash light emitting device, and the like, and a power switch 15 and a release switch 14 on the upper surface. The rear cover 3 is provided with an operation switch group 13 for setting a photographing mode and an image display device 16 on the rear surface.

  The camera control board 18 is a CPU that controls the entire camera, a shooting mode control unit, a strobe light emission control unit, an image processing unit that processes captured image data by the image sensor, and captured image data in a flash memory that is an image recording medium. It consists of a printed circuit board on which a recording control unit for writing, a blur detection sensor, and the like are mounted, and is incorporated in the right side inside the front cover 2.

  As shown in FIG. 4, the lens frame unit 20 includes a lens frame main body 4 as a lens frame having a flat outer shape, an optical system member incorporated in the lens frame main body 4, and a lens frame main body 4. And an image sensor moving mechanism 71 that holds the image sensor 96 disposed in the lower portion in the Z direction.

  As shown in FIG. 4, the optical system member incorporated in the lens frame main body 4 includes a first lens group that includes a prism 35b and is fixed in position relative to the lens frame main body 4, and the optical axis O2. Each of the second lens group 36, the third lens group 38, and the fourth lens group 39 is configured to be independently movable. Since the mechanism for moving the second lens group 36, the third lens group 38, and the fourth lens group 39 along the optical axis O2 is a known technique, the description thereof will be omitted. Although not shown, the optical system member includes a shutter and a variable aperture.

  The image sensor moving mechanism 71 is configured to hold the image sensor 96 so as to be movable relative to the optical axis O2. The image sensor moving mechanism 71 moves the image sensor 96 based on the movement (blur) amount of the image pickup apparatus 1 detected by the camera shake detection sensor provided on the camera control board 18, thereby blurring the image to be captured. This is a configuration for realizing a function of preventing or suppressing the above. This function of preventing or suppressing blurring of a captured image is generally called, for example, a blur correction function.

  The image sensor moving mechanism 71 of the present embodiment holds the image sensor 96 so that the image sensor 96 can move along a plane substantially orthogonal to the optical axis O2. More specifically, the image sensor moving mechanism 71 is movable in the Y direction with respect to the X slider 89 that is a first moving member that can move in the X direction with respect to the lens barrel body 4 and the X slider 89. An image sensor holding unit 91 that is a second moving member and to which the image sensor 96 is fixed, and a drive mechanism unit that moves the X slider 89 and the image sensor holding unit 91 in the X direction and the Y direction, respectively. Yes.

  As will be described in detail later, the image sensor holding unit 91 is a frame-like member having a central opening 91a through which the optical axis O2 passes. An image pickup device 96 is fixed to the lower side of the image pickup device holding portion 91, and the image pickup device 96 is exposed to the upper side of the image pickup device holding portion 91 through the central opening 91a.

  As shown in FIG. 7, the X slider 89 is connected to the lens frame main body 4 by an X guide shaft 86 that is a first guide portion fixed to the lens frame main body 4, and moves in the X direction by the X guide shaft 86. To be guided. As shown in FIG. 8, the image sensor holding portion 91 is connected to the X slider 89 by a Y guide shaft 92 that is a second guide portion fixed to the X slider 89, and moves in the Y direction by the Y guide shaft 92. To be guided.

  More specifically, as shown in FIG. 8, the X slider 89 has a pair of bearing portions 89a and 89b, which are through holes arranged on the same axis in the X direction, and the same axis in the Y direction. A pair of shaft holding holes 89c and 89d which are provided through holes are formed.

  A pair of bearing portions 89a and 89b provided on the X slider 89 are holes into which an X guide shaft 86 fixed to the lens barrel main body 4 is inserted, and the X slider 89 includes the pair of bearing portions 89a and 89b. , Slide along the X guide shaft 86. A pair of shaft holding holes 89 c and 89 d provided in the X slider 89 are holes for fixing the Y guide shaft 92 fitted inside the X slider 89 to the X slider 89. Further, the X slider 89 is provided with a U-shaped notch 89f at a side position of the bearing 89a.

  A pair of bearing portions 91d and 91e, which are through-holes disposed on the same axis in the Y direction, are formed in the right end portion of the image sensor holding portion 91. A pair of bearing portions 91d and 91e provided in the image sensor holding portion 91 are holes into which a Y guide shaft 92 fixed to the X slider 89 is inserted, and the image sensor holding portion 91 is a pair of bearing portions 91d. And 91e slide along the Y guide shaft 92.

  Further, the image sensor holding portion 91 is provided with a U-shaped cutout portion 91f at a position above the bearing portion 91e. A guide protrusion 91 c is provided at the left end of the image sensor holding portion 91.

  When connecting the image sensor holding portion 91 and the X slider 89, first, the Y guide shaft 92 is inserted from the shaft holding hole 89c of the X slider 89, and then the Y guide shaft 92 is sequentially inserted into the bearing portion 91d, the shaft holding hole 89d, The bearing 91e is penetrated. Then, the Y guide shaft 92 and the X slider 89 are fixed with an adhesive. In this state, when the Y guide shaft 92 is fixed to the X slider 89, the front end portion of the Y guide shaft 92 protrudes forward and outward from the front end surface of the image sensor holding portion 91.

  Further, a tension spring (not shown) is suspended between the image sensor holding portion 91 and the X slider 89. The tension spring is disposed so as to generate a force that urges the image sensor holding portion 91 toward the rear in the Y direction with respect to the X slider 89. As described above, the image sensor holding portion 91 is supported so as to be relatively movable in the Y direction while being urged rearward in the Y direction by the tension spring with respect to the X slider 89.

  As shown in FIGS. 7 and 9, a pair of shaft holding holes 4f, which are through-holes arranged on the same axis in the X direction, on the lower side of the lens frame main body 4 and on the right side of the optical axis O2. And 4 g are provided. The pair of shaft holding holes provided in the lens frame main body 4 are holes for fixing to the X guide shaft 86 lens frame main body 4 fitted inside.

  When connecting the lens frame main body 4 and the X slider 89, the X guide shaft 86 is inserted from the bearing portion 89a of the X slider 89, and then the X guide shaft 86 is inserted into the shaft holding hole 4f, the bearing portion 89b, and the shaft holding hole. Insert into 4g. At this time, a compression coil spring 87 is disposed around the X guide shaft 86 and between the bearing portion 89a and the shaft holding hole 4f (FIG. 7). Then, the X guide shaft 86 and the lens frame body 4 are fixed with an adhesive. As a result, the X slider 89 is supported by the compression coil spring 87 so as to be relatively movable in the X direction with respect to the lens frame body 4 while being urged to the right in the X direction with respect to the lens frame body 4. Is done.

  Further, as shown in FIG. 9, the wall surface portion of the lens barrel main body 4 at a position spaced from the lower position of the shaft holding holes 4f and 4g to the front side in the Y direction has a long hole shape along the X direction. A bearing portion 4k is provided. The bearing portion 4k is provided at a position where the front end portion of the Y guide shaft 92 protruding forward from the front end surface of the image sensor holding portion 91 is inserted.

  The width of the bearing portion 4k is set such that the front end portion of the Y guide shaft 92 is slidable in the X direction without any play. The front end portion of the Y guide shaft 92 is supported by the bearing portion 4k, so that the X slider 89 and the image sensor holding portion 91 guided in the X direction by the X guide shaft 86 around the X guide shaft 86. The rotation is restricted.

  Further, a bearing portion 4r which is a third guide portion and photo interrupters 69x and 69y are provided below the lens frame main body portion 4 and on the left side of the optical axis O2. The photo interrupters 69x and 69y are used for detecting the origin of an electric motor that constitutes a drive mechanism section described later.

  The bearing portion 4r has a shape that comes into contact with a guide protrusion 91c protruding leftward from the image sensor holding portion 91 from both directions in the Z direction (vertical direction). Further, the bearing portion 4r and the guide projection 91c are relatively slidable in the X direction and the Y direction. That is, the guide protrusion 91c can slide in the X direction and the Y direction in the bearing portion 4r without any play in the Z direction. In other words, the bearing portion 4r regulates the movement of the guide protrusion 91c in the Z direction by sandwiching the guide protrusion 91c in the Z direction (the direction along the optical axis O2), and the guide protrusion 91c X The guide projection 91c is supported so as not to hinder movement in the direction and the Y direction.

  The guide protrusion 91c on the left side of the optical axis O2 of the image pickup device holding portion 91 is supported by the bearing portion 4r, whereby the Y guide of the image pickup device holding portion 91 guided in the Y direction by the Y guide shaft 92. The rotation around the shaft 92 is restricted.

  Further, a tension spring (not shown) is suspended between the image sensor holding portion 91 and the lens barrel main body portion 4. The backlash of the image sensor holding portion 91 with respect to the Y guide shaft 92 is removed by the urging force of the tension spring.

  As described above, the X slider 89 is guided in the X direction by the X guide shaft 86 with respect to the lens barrel main body 4, and is supported in a state in which it receives the urging force in the left direction by the compression coil spring 87. The X slider 89 can be displaced in the X direction with respect to the lens barrel main body 4 by pressing the U-shaped notch 89 f with a nut 76 described later. On the other hand, the image sensor holding portion 91 is displaceable together with the X slider 89 in the X direction, is guided by the Y guide shaft 92 in the Y direction, and is supported in a state of receiving a rearward biasing force by a tension spring. Has been. The image sensor holding portion 91 can be displaced in the Y direction with respect to the lens barrel main body portion 4 by pressing the U-shaped cutout portion 91f with a nut described later. That is, the image sensor holding portion 91 can be displaced two-dimensionally on the XY plane orthogonal to the optical axis O2 with respect to the lens barrel main body portion 4.

  As described above, the X slider 89 and the image sensor holding unit 91 supported so as to be displaceable in the X direction and the Y direction with respect to the lens barrel body 4 are driven in the X direction and the Y direction by the drive mechanism unit. Will be described. The drive mechanism unit includes an X drive mechanism unit that drives the X slider 89 in the X direction, and a Y drive mechanism unit that drives the image sensor holding unit 91 in the Y direction.

  As shown in FIGS. 7 and 9, the X drive mechanism section is screwed into the electric motor 72 formed of a stepping motor, a screw 75 that is rotationally driven by the electric motor 72 via gears 73 and 74, and the screw 75. And a nut 76.

  The screw 75 passes through a U-shaped notch 89f provided in the X slider 89, and is arranged so that the rotation axis is along the X direction. The rotation of the nut 76 around the screw 75 is restricted, and the nut 76 moves in the X direction as the screw 75 driven to rotate by the electric motor 72 rotates.

  The X slider 89 is biased toward the nut 76 by a compression coil spring 87 disposed around the X guide shaft 86. For this reason, the X slider 89 is always in contact with the nut 76 in the vicinity of the U-shaped notch 89f, and the X slider 89 is displaced in the X direction according to the nut 76 that moves forward and backward in the X direction according to the rotation of the electric motor 72. .

  The configuration of the Y drive mechanism section is the same as that of the X drive mechanism section, although the arrangement direction is different. As shown in FIG. 10, the Y drive mechanism section includes an electric motor 79 composed of a stepping motor, a screw 83 that is rotationally driven by the electric motor 79 via gears 81 and 82, and a nut 84 that is screwed into the screw 83. It is comprised.

  The screw 83 passes through a U-shaped notch 91f provided in the image sensor holding portion 91, and is arranged so that the rotation axis is along the Y direction. The rotation of the nut 84 around the screw 83 is restricted, and the nut 84 moves in the Y direction as the screw 83 rotated by the electric motor 79 rotates.

  Further, the image sensor holding portion 91 is biased toward the nut 83 by a tension spring (not shown). Therefore, the image sensor holding portion 91 is always in contact with the nut 83 in the vicinity of the U-shaped notch 91f, and the image sensor holding portion 91 moves in the Y direction according to the nut 83 that moves forward and backward in the Y direction according to the rotation of the electric motor 79. It is displaced to.

  As described above, the image sensor holding unit 91 to which the image sensor 96 is fixed is displaced and driven by the drive mechanism unit in the X and Y directions perpendicular to the optical axis O2 with respect to the lens barrel main body 4. .

  Next, a configuration for fixing the image sensor 96 to the image sensor holding unit 91 will be described.

  As shown in FIGS. 11 and 12, the image sensor 96 is mounted on a printed circuit board 95. In the present embodiment, a so-called image pickup device package in which the periphery of a bare chip that functions as an image pickup device is sealed with a case and a cover glass is referred to as an image pickup device 96. The image sensor 96 and the printed circuit board 95 are fixed by soldering, anisotropic conductive adhesive, or the like.

  The image sensor 96 of the present embodiment has a substantially rectangular plate shape when viewed along the optical axis O2. In the following description, the surface on the side where the image sensor 96 receives light is referred to as a light receiving surface 96a, and the surface opposite to the light receiving surface 96a is referred to as a back surface 96b. In addition, when the imaging device 96 is viewed along the optical axis O2, a surface that is an outer periphery is referred to as a side surface 96c.

  As an example in this embodiment, the printed circuit board 95 is a hard board of a double-sided mounting type as illustrated, and an electronic component 95a and a connector 95b are provided on the back surface opposite to the surface on which the image sensor 96 is mounted. Has been implemented. The connector 95b is configured to be able to connect a flexible printed circuit board (FPC) (not shown).

  The image sensor 96 and the printed circuit board 95 are electrically connected to the camera control board 18 through a flexible printed circuit board connected to the connector 95b. The printed circuit board 95 may be a single-sided mounting type in which electronic components or the like are not mounted on the back surface, and the printed circuit board 95 may be a flexible flexible printed circuit board.

  The image sensor 96 is fixed to the frame member 97 with an adhesive 100. Although described in detail later, the frame member 97 is a member fastened to the image sensor holding portion 91 by a screw 102. That is, the image sensor 96 is fixed to the image sensor holding unit 91 via the frame member 97.

  When viewed along the optical axis O2, the frame member 97 has an opening 97a penetrating in the direction of the optical axis O2 at the center portion, and when viewed along the optical axis O2, the image pickup element at a plurality of locations on the outer peripheral portion. A plurality of hook-shaped portions 97b projecting outward from the outer shape of 96.

  The frame member 97 of the present embodiment has a shape obtained by bending a plate-like member so that a cross section taken along the XZ plane is a hat shape, as shown in FIG. That is, the frame member 97 includes a channel-shaped portion 97c that is a portion obtained by bending the plate-shaped member so as to have a U-shape when viewed from the Y direction, and a pair of side surfaces 97cb of the channel-shaped portion 97c. It has a hook-shaped portion 97b which is a portion where each end portion is bent outward in the X direction. The bottom surface 97ca of the channel-shaped portion 97c and the pair of flange-shaped portions 97b are substantially parallel, and the pair of flange-shaped portions 97b are disposed on substantially the same plane.

  In other words, the channel-shaped portion 97c of the frame member 97 is a concave portion that is recessed with respect to the plane formed by the pair of hook-shaped portions 97b. As shown in FIG. 12, the channel-shaped portion 97c can house the image pickup device 96 in the direction in which the light receiving surface 96a faces the bottom surface 97ca. In other words, the channel-shaped portion 97c is disposed such that the opening direction of the U-shape is directed to the image side along the optical axis O2.

  Here, the width (a distance in the X direction) between the pair of side surfaces 97cb facing each other of the channel-shaped portion 97c can accommodate the imaging element 96 with a gap having a predetermined width between the pair of side surfaces 97cb. In addition, the image pickup element 96 is set to a value that can be fixed to the frame member 97 by the adhesive 100 filled in the gap.

  Here, in a state where the image sensor 96 is fixed to the frame member 97 with the adhesive 100, the printed circuit board 95 is separated from the frame member 97. That is, the image sensor 96 and the printed circuit board 95 are not in direct contact with the frame member 97 but are fixed to the frame member 97 via the adhesive 100 in a state of being separated from the frame member 97. .

  An opening 97a is formed in the bottom surface 97ca of the channel-shaped portion 97c. When the imaging element 96 is fixed in the channel-shaped part 97c by the adhesive 100, the opening 97a exposes at least the effective pixel region 96d of the imaging element 96 to the opposite side of the bottom surface 97ca through the opening 97a. It has a shape and size. In other words, the effective pixel region 96d of the imaging element 96 is exposed to the object side (imaging optical system member side) of the optical axis O2 through the opening 97a.

  The frame member 97 is fastened to the lower side of the image sensor holding unit 91 by a plurality of screws 102 that are screwed onto the image sensor holding member 91 from below in the Z direction upward. As shown in FIG. 11, the frame member 97 is provided with three through-holes 97d drilled in the bowl-shaped portion 97b. The three through holes 97d are arranged around the opening 97a so that all three do not line up in the same straight line when the frame member 97 is viewed from the Z direction (optical axis O2 direction). In the present embodiment, one through hole 97d is formed in the hook-shaped portion 97b extending leftward, and two through-holes 97d are formed in the hook-shaped portion 97b extending rightward. .

  On the lower surface of the image sensor holding portion 91, a substantially flat pedestal portion 91h having a screw hole into which the screw 102 is screwed is provided. The pedestal portion 91 h is provided at a position where the screw hole corresponds to the through hole 97 d of the frame member 97. That is, in the present embodiment, the pedestal portions 91 h are provided at three locations on the lower surface of the image sensor holding portion 91.

  The frame member 97 is inserted into the three through holes 97d, and is held by the image pickup element by three screws 102 that are screwed into the screw holes of the pedestal portion 97d from the image side to the object side substantially parallel to the optical axis O2. Fastened and fixed to the portion 91. In the present embodiment, the frame member 97 is fastened to the image sensor holding portion 91 by screws 102 at three locations, but the frame member 97 is fastened to the image sensor holding portion 91 by screws 102 at four locations. There may be.

  By fastening the frame member 97 to the image sensor holding unit 91, the image sensor 96 is fixed to the image sensor holding unit 91. Here, an adjustment member 103 to be described later is sandwiched between the frame member 97 and the three pedestal portions 91h. Further, an adjustment member 103 and a biasing member 101 described later are sandwiched between the frame member 97 and the heads of the three screws 102. That is, as will be described in detail later, the adjustment member 103 and the biasing member 101 together with the frame member 97 are fastened to the image sensor holding portion 91 by a plurality of screws 102 in a so-called co-tightened state.

  In a state where the frame member 97 is fastened to the image sensor holding unit 91 by the screw 102, the filter 98 and the seal member 99 are sandwiched between the image sensor holding unit 91 and the light receiving surface 96 a of the image sensor 96.

  The filter 98 is a transparent plate-like member that transmits at least visible light. The filter 98 is disposed so as to be substantially orthogonal to the optical axis O <b> 2 and close the central opening 91 a of the image sensor holding unit 91. The filter 98 may be a simple transparent glass plate, or may have a predetermined function such as a low-pass filter or an infrared cut filter, or may be a combination of these.

  The seal member 99 is sandwiched between the filter 98 and the light receiving surface 96 a of the image sensor 96. The seal member 99 has a frame shape surrounding the outer periphery of the effective pixel region 96d of the image sensor 96 when viewed from the Z direction (optical axis O2 direction), and is in close contact with the filter 98 and the image sensor 96 over the entire circumference.

  The seal member 99 is a member provided to prevent dust from entering between the light receiving surface 96 a of the image sensor 96 and the filter 98. The seal member 99 is made of an elastic member such as synthetic resin or rubber.

  The frame-shaped seal member 99 is formed with a lip 99a having a wedge-shaped cross section over the entire circumference. The lip portion 99 a is provided so as to protrude from the lower surface of the seal member 99 toward the light receiving surface 96 a of the image sensor 96.

  In a state where the seal member 99 is sandwiched between the filter 98 and the light receiving surface 96a of the image sensor 96, the lip 99a is in close contact with the light receiving surface 96a. Since the seal member 99 is made of an elastic material, the seal member 99 is elastically deformed in the Z direction even when the distance between the filter 98 and the light receiving surface 96a of the image sensor 96 changes within a predetermined range. Thus, the filter 98 and the light receiving surface 96a are always in close contact with each other.

  In other words, the seal member 99 is elastically deformed to force the image sensor 96 toward the lower side in the Z direction (image side along the optical axis O2) relative to the image sensor holding portion 91. It is the member comprised so that it might generate | occur | produce. In other words, the seal member 99 generates a force that urges the image sensor 96 in a direction away from the filter 98 by elastic deformation.

  A biasing member 101 is disposed below the printed circuit board 95. The urging member 101 is fastened to the image sensor holding portion 91 with screws 102 at three locations together with the frame member 97. The urging member 101 is a member that generates a force that urges the image sensor 96 and the printed circuit board 95 toward the upper side in the Z direction (the object side along the optical axis O2) by elastic deformation. . In other words, the urging member 101 is elastically deformed to generate a force that urges at least one of the image sensor 96 and the printed circuit board 95 in a direction approaching the filter 98.

  In this embodiment, the urging member 101 is configured to urge the imaging element 96 in a direction approaching the filter 98 via the printed circuit board 95 by directly contacting the printed circuit board 95. The member 101 may be in a form that directly contacts the image sensor 96 and biases the image sensor 96 in a direction approaching the filter 98.

  The configuration in which the urging member 101 generates a force that urges the imaging element 96 and the printed circuit board 95 by elastic deformation is not particularly limited, and may be a form such as a leaf spring or a coil spring. Further, rubber or sponge that is elastically deformed in the Z direction may be used.

  In the present embodiment, the strength of the force by the biasing member 101 that biases the image sensor 96 and the printed circuit board 95 in the direction approaching the filter 98 is such that the image sensor 96 by the seal member 99 moves away from the filter 98. It is configured to be approximately equivalent to the strength of the energizing force.

  In this embodiment, as an example, the urging member 101 is formed by bending a metal plate, and urges the imaging element 96 and the printed circuit board 95 upward in the Z direction by a plate spring structure. Have.

  Specifically, as shown in FIG. 11, the urging member 101 is a plate-like member disposed so as to cover the printed circuit board 95 and the frame member 97, and has a plurality of screws 102 around it. A through hole 101a is formed through which is inserted. In the present embodiment, the through holes 101a are formed at three locations. The urging member 101 is fixed to the image sensor holding portion 91 together with the frame member 97 by a screw 102 inserted through the through hole 101a.

  The biasing member 101 is formed with one or a plurality of leaf spring portions 101b. The leaf spring portion 101b is formed by bending a part of the urging member 101 upward in the Z direction, and in a state where the urging member 101 is fixed to the image sensor holding portion 91, the lower side of the printed circuit board 95 is formed. A force that urges the printed circuit board 95 upward in the Z direction is generated in contact with the surface. Here, even if the positions of the image sensor 96 and the printed circuit board 95 change within a predetermined range in the Z direction, the leaf spring portion 101b is always elastically deformed in the Z direction, so that the printed circuit board 95 is always provided. It is comprised so that it may touch.

  The leaf spring portions 101b are provided at three locations. Specifically, the leaf spring portion 101b is provided in the vicinity of each of the three through holes 101a. In other words, the leaf spring portion 101 b is disposed in the vicinity of each of the three screws in a state where the leaf spring portion 101 b is fastened to the image sensor holding portion 91 by the three screws 102.

  The adjustment member 103 is sandwiched between the frame member 97 and the pedestal portion 91 h and between the frame member 97 and the biasing member 101 at locations where the screws 102 are fastened.

  Specifically, the adjustment member 103 is a member made of one metal plate. As shown in FIG. 13, the adjustment member 103 includes a pair of shim portions 103a in which screw insertion holes 103b are formed, and the pair of shim portions 103a. It has the connection part 103c to connect, and is comprised. Since the adjustment member 103 is composed of a single metal plate, the pair of shim portions 103b have substantially the same thickness.

  The pair of shim portions 103a are coupled to each other so as to face each other and be substantially parallel by a coupling portion 103c. The distance between the pair of shim portions 103a is the same value as the thickness of the flange portion 97b of the frame member 97. The screw insertion holes 103b formed in the pair of shim portions 103a are formed on substantially the same axis and have a shape into which the screw 102 can be inserted.

  The pair of shim portions 103a are respectively sandwiched between the frame member 97 and the pedestal portion 91h and between the frame member 97 and the biasing member 101, and are imaged together with the frame member 97 and the biasing member 101 by the screws 102. Fastened to the element holding portion 91.

  In the present embodiment as described above, by changing the thickness of the plate constituting the adjustment member 103, the distance between the frame member 97 and the pedestal portion 91h of the image sensor holding portion 91, and the frame member 97 and the biasing member. The distance to 101 changes simultaneously.

  Since the frame member 97 to which the image pickup device 96 is fixed is fastened to the image pickup device holding portion 91 by three screws 102 at the outer peripheral portion, the frame member 97 and the base portion 91h of the image pickup device holding portion 91 By changing the thickness of the three shim portions 103a sandwiched between them to different ones, the angle formed between the light receiving surface 96a of the image sensor 96 and the optical axis O2 can be changed.

  For example, if the thickness of one of the adjustment members 103 disposed at three locations is made thinner than the other two, the frame member 97 at the fastening location where the thin adjustment members 103 are disposed. The distance between the image sensor holding portion 91 and the base portion 91h of the image sensor holding portion 91 is smaller than other fastening locations, and the angle of the frame member 97 with respect to the image sensor holding portion 91 changes. That is, the angle formed by the image sensor 96 fixed to the frame member 97 and the optical axis O2 changes. Adjustment of the angle formed by the image sensor 96 and the optical axis O2 is generally referred to as tilt adjustment or the like. In the present embodiment, since the pair of shim portions 103a are coupled by the coupling portion 103c in each of the adjustment members 103, the replacement work of the adjustment member 103 at the time of tilt adjustment can be easily performed.

  Here, as described above, the imaging element 96 and the printed circuit board 95 are fixed to the frame member 97 by the adhesive 100 without being in direct contact with the frame member 97.

  The image sensor 96 and the printed circuit board 95 are urged toward the lower side in the Z direction (image side along the optical axis O2) by the seal member 99 sandwiched between the image sensor 96 and the filter 98. Has been. The force with which the seal member 99 urges the image sensor 96 and the printed circuit board 95 toward the image side is substantially proportional to the amount by which the seal member 99 is compressed in the direction of the optical axis O2. For example, if the thickness of the adjustment member 103 is reduced, the light receiving surface 96a of the image sensor 96 approaches the filter 98 in the vicinity of the adjustment member 103 and the amount of compression of the seal member 99 increases, so that the biasing force generated by the seal member 99 is increased. Becomes stronger.

  In the following, as an example, as shown in FIG. 14, when the thickness of the adjustment member 103 is t1, the seal member 99 urges the image sensor 96 and the printed circuit board 95 toward the image side in the vicinity of the adjustment member 103. The force to do is called Fd1.

  On the other hand, the image sensor 96 and the printed circuit board 95 are urged toward the upper side in the Z direction (object along the optical axis O2) by the leaf spring portion 101b of the urging member 101.

  The force with which the leaf spring portion 101b urges the image sensor 96 and the printed circuit board 95 toward the object side changes in accordance with the thickness of the adjustment member 103 disposed in the vicinity of the leaf spring portion 101b. Specifically, if the thickness of the adjustment member 103 disposed in the vicinity of a certain plate spring portion 101b is reduced, the biasing member 101 approaches the printed circuit board 95 and the deformation amount of the plate spring portion 101d increases. The urging force generated by the leaf spring portion 101b is increased.

  In the following, as an example, as shown in FIG. 14, when the thickness of the adjustment member 103 is t1, the leaf spring portion 101b near the adjustment member 103 biases the image sensor 96 and the printed circuit board 95 toward the object side. The force to perform is referred to as Fu1.

  In the present embodiment, the seal member 99 near the certain adjustment member 103 has a strength of a force Fd1 that urges the image pickup device 96 and the printed circuit board 95 toward the image side, and the leaf spring portion 101b in the vicinity of the adjustment member 103 includes the image pickup device 96. The strength of the force Fu1 that urges the printed circuit board 95 toward the object side is substantially equal. In other words, in this embodiment, the force Fd1 generated by the seal member 99 that is in close contact with the light receiving surface 96a of the image sensor 96 and biases the image sensor 96 toward the image side is applied in the opposite direction generated by the bias member 101. Counteracted by the force Fu1. This is the same in all three places where the frame member 97 is fastened to the image sensor holding portion 91 by the screw 102.

  As described above, in the imaging apparatus 1 according to the present embodiment, the urging member 101 is provided in the vicinity of each region where the frame member 97 and the urging member 101 are fastened to the imaging element holding unit 91 by the plurality of screws 102. The plurality of leaf springs 101b thus generated generates a biasing force Fu1 that cancels a force Fd1 generated by the seal member 99 that biases the image sensor 96 away from the filter 98. For this reason, for example, even when the image pickup apparatus 1 is left in a high temperature environment for a long time, the adhesive does not undergo a creep change due to the biasing force of the seal member 99 applied to the image pickup element 96. That is, the imaging apparatus 1 of the present embodiment can prevent a change in the position of the imaging element 96 due to the deformation of the adhesive 100.

  Next, a description will be given of a case where the thickness of the adjustment member 103 is changed in order to adjust the tilt of the image pickup device 96 when the image pickup apparatus 1 of the present embodiment is assembled.

  For example, as shown in FIG. 15, when the thickness of any of the three adjustment members 103 is changed to t2, which is thinner than t1, in the vicinity of the screw 102 to which the adjustment member 103 is fastened, the frame member As 97 approaches the image sensor holding unit 91, the filter 98 approaches the light receiving surface 96 a of the image sensor 96. In this case, since the seal member 99 is further compressed in the Z direction as compared with the state of FIG. 14, the strength of the force Fd2 generated by the seal member 99 and biasing the image sensor 96 away from the filter 98 is greater. growing. At the same time, in the vicinity of the screw 102 to which the adjusting member 103 having the thickness t2 is fastened, the urging member 101 is brought closer to the frame member 97, so that the leaf spring portion 101b disposed in the vicinity of the screw 102 is generated. In addition, the strength of the urging force Fu2 in the direction in which the image sensor 96 is brought closer to the filter 98 is also increased.

  Further, for example, as shown in FIG. 16, when the thickness of any of the three adjustment members 103 is changed to t3 thicker than t1, in the vicinity of the screw 102 to which the adjustment member 103 is fastened, As the frame member 97 moves away from the image sensor holding portion 91, the light receiving surface 96a of the image sensor 96 moves away from the filter 98. In this case, since the compression amount of the seal member 99 in the Z direction is smaller than that in the state of FIG. 14, the strength of the force Fd3 generated by the seal member 99 and biasing the image sensor 96 away from the filter 98 is Smaller. At the same time, in the vicinity of the screw 102 to which the adjusting member 103 having the thickness t3 is fastened, the biasing member 101 moves away from the frame member 97, so that the leaf spring portion 101b disposed in the vicinity of the screw 102 is generated. The intensity of the urging force Fu3 in the direction in which the image sensor 96 is brought closer to the filter 98 is also reduced.

  As described above, when the tilt adjustment of the image pickup device 96 is performed at the time of assembling the image pickup apparatus 1, the image pickup device 96 that generates the seal member 99 due to a change in the distance between the light receiving surface 96 a of the image pickup device 96 and the filter 98. The strength of the urging force in the direction away from the filter 98 changes. In the present embodiment, as described above, when the biasing force generated by the seal member 99 is increased by the tilt adjustment, the biasing force generated by the leaf spring portion 101b of the biasing member 101 is also increased. On the contrary, when the biasing force generated by the seal member 99 is weakened by the tilt adjustment, the biasing force generated by the leaf spring portion 101b of the biasing member 101 is also weakened.

  As described above, in this embodiment, even if the urging force in the direction of moving the image pickup device 96 generated by the seal member 99 away from the filter 98 is changed by the tilt adjustment, the urging member is changed according to the strength of the change. The strength of the urging force in the direction in which the image sensor 96 generated by the leaf spring portion 101 b of 101 is brought closer to the filter 98 changes. In other words, even when tilt adjustment is performed, the urging force generated by the sealing member 99 and the urging force generated by the leaf spring portion 101b of the urging member 101 are always kept in balance and cancel each other.

  Therefore, the image pickup apparatus 1 according to the present embodiment is configured to be able to adjust the tilt of the image pickup element 96 fixed to the frame member 97 with an adhesive, and further, the image pickup element 96 due to the deformation of the adhesive 100. It is possible to prevent changes in the position.

  In the present embodiment described above, the shim portion 103a of the adjustment member 103 has a washer-like shape with a screw insertion hole 103b formed in the center. However, the present invention is limited to this embodiment. It is not a thing. For example, as shown in FIG. 17, the shim portion 103 a of the adjustment member 103 may have a U shape in which a screw insertion hole 103 b is opened in a predetermined direction. As shown in the modified example of FIG. 17, when the shim portion 103 has a U shape, the adjustment member 103 can be replaced with the screw 102 loosened without removing the screw 102. The operation of 96 tilt adjustments becomes easy.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. This embodiment differs from the first embodiment only in the configuration of the adjustment member and the biasing member. Therefore, only this difference will be described below, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

  As shown in FIGS. 18 and 19, in this embodiment, the shim portion 104 a of the adjustment member 104 for adjusting the distance between the frame member 97 and the image sensor holding portion 91 in the vicinity of the screw 102, and the bias The plate spring portion 104d of the member is integrally formed.

  Specifically, as shown in FIG. 18, the adjustment member 104 is made of a metal plate, and a screw insertion hole 104b through which the screw 102 is inserted is formed in the shim portion 104a. The shim portion 104a is connected to the leaf spring portion 104d by a connecting portion 104c. The leaf spring portion 104 d is configured to be in contact with the printed circuit board 95 and generate a biasing force Fu that biases the printed circuit board 95 and the image sensor 96 in a direction approaching the filter 98. In the present embodiment, a tool insertion portion 104e is provided in the leaf spring portion 104d so as not to interfere with a driver for turning the screw 102.

  In the present embodiment, the strength of the urging force Fu generated by the leaf spring portion 104d is determined by the image pickup element generated by the seal member 99 when the shim portion 104a to which the leaf spring portion 104d is coupled is fastened by the screw 102. It is set to be substantially the same as the strength of the biasing force Fd that biases 96 away from the filter 98.

  In the present embodiment as described above, the urging force Fd generated by the seal member 99 and the urging force Fu generated by the leaf spring portion 104d are always kept in balance and cancel each other out, as in the first embodiment. It is possible to prevent a change in the position of the image sensor 96 due to the deformation of the adhesive 100.

  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, and an imaging apparatus with such a change Is also included in the technical scope of the present invention.

  The imaging apparatus according to the present invention is not limited to the form of the digital camera described in the above embodiment, but includes binoculars, recording equipment, portable communication terminals, game machines, digital media players, watches, navigation apparatuses, and the like having an imaging function. Needless to say, other electronic devices may be used.

1 imaging device,
2 Front cover,
2d shooting aperture window,
2e Light emitting window,
3 Rear cover,
4 Mirror frame body,
4f shaft holding hole,
4g shaft holding hole,
4k bearing part,
4r bearing part,
13 Operation switch group,
14 Release switch,
15 Power switch,
16 image display device,
18 Camera control board,
20 lens frame,
35b prism,
36 second lens group,
38 Third lens group,
39 Fourth lens group,
69x photo interrupter,
69y photo interrupter,
71 imaging element moving mechanism,
72 electric motor,
73 gear,
74 gears,
75 screws,
76 nuts,
79 electric motor,
81 gears,
82 gears,
83 screw,
84 nuts,
86 X guide shaft,
87 compression coil spring,
89 X slider,
89a bearing part,
89b bearing part,
89c shaft holding hole,
89d shaft holding hole,
89f U-shaped notch,
91 Image sensor holding unit,
91a central opening,
91c guide protrusion,
91d bearing part,
91e bearing part,
91f U-shaped notch,
91h pedestal,
92 Y guide shaft,
95 printed circuit board,
96 image sensor,
96a light receiving surface,
96b reverse side,
96c side,
96d effective pixel area,
97 frame members,
97a opening,
97b bowl-shaped part,
97c channel-shaped part,
97ca bottom,
97cb side,
97d through hole,
98 filters,
99 seal member,
99a Lip part,
100 adhesive,
101 biasing member,
101a through hole,
101b leaf spring part,
102 screws,
103 adjustment member,
103a shim part,
103b Screw insertion hole,
103c connecting part,
104 adjustment member,
104a shim part,
104b Screw insertion hole,
104c connecting part,
104d leaf spring part,
104e Tool insertion part.

Claims (4)

Image sensor,
A printed circuit board on which the image sensor is mounted;
A frame member in which the imaging element or the printed circuit board is fixed by an adhesive;
An image sensor holding unit configured to hold the image sensor in a predetermined position by fastening the frame member with a plurality of screws;
A plate-like filter fixed to the image sensor holding unit and disposed opposite to the light receiving surface of the image sensor, and sandwiched between the light receiving surface and the filter to seal the periphery of the light receiving surface An imaging apparatus including a sealing member that performs
An urging member disposed on the opposite side of the image sensor holding unit with the frame member interposed therebetween, and a biasing member fastened to the image sensor holding unit together with the frame member by the plurality of screws;
The biasing member is made of a member having elasticity, and elastically deforms in a state where the biasing member is fastened to the image sensor holding portion, thereby biasing at least one of the image sensor and the printed circuit board in a direction approaching the filter. An image pickup apparatus configured to generate a biasing force to be biased. Each of the vicinity of the plurality of screws includes a pair of shim portions having the same thickness sandwiched between the imaging element holding unit and the frame member and between the frame member and the biasing member. And
The imaging apparatus according to claim 1, wherein tilt adjustment of the imaging element can be performed by changing a thickness of the pair of shim portions in each of the vicinity of the plurality of screws.   The biasing member includes a plurality of leaf spring portions that contact at least one of the imaging element and the printed circuit board and generate the biasing force in the vicinity of the plurality of screws, respectively. 2. The imaging device according to 2.   The imaging device according to claim 2, wherein the pair of shim portions are connected by a connecting portion.

Images