WO2018105328A1

WO2018105328A1 - Image pickup device

Info

Publication number: WO2018105328A1
Application number: PCT/JP2017/040842
Authority: WO
Inventors: 金子　晃平
Original assignee: 株式会社ｎｉｔｔｏｈ
Priority date: 2016-12-05
Filing date: 2017-11-14
Publication date: 2018-06-14
Also published as: JPWO2018105328A1

Abstract

[Problem] To provide an image pickup device whereby a camera main body having an image pickup element can be more reduced in thickness compared with conventional cases. [Solution] This image pickup device is provided with a camera main body 2 having an image pickup element 11, and an opening 15a is formed in the subject-side surface of the camera main body 2. The camera main body 2 is provided with: an optical filter 13 that is disposed on the subject side of the image pickup element 11; a holding member 14 that holds at least the optical filter 13; and a cover member 26, in which an opening 26a smaller than the opening 15a is formed, said cover member being disposed further toward the side opposite to the subject than the opening 15a. In the camera main body 2, a part of the holding member 14 is disposed in the opening 26a.

Description

Imaging device

The present invention relates to an imaging apparatus that captures an image.

Conventionally, a lens-less mirrorless camera is known (see, for example, Patent Document 1). The camera described in Patent Document 1 includes a main body having a body mount for detachably mounting a photographing lens and a mount holding portion for holding the body mount. The main body includes an imaging device, an optical low-pass filter, and an optical holding member that holds the imaging device and the optical low-pass filter.

In the camera described in Patent Document 1, the mount holding portion includes a cylindrical cylindrical portion to which the body mount is fixed, and a cover portion that extends inward in the radial direction of the cylindrical portion. The body mount is fixed to the front end surface (end surface on the subject side) of the cylindrical portion. The cover part is connected to the rear end part of the cylindrical part. An opening is formed in the cover portion, and an optical low-pass filter and an image sensor are disposed behind the opening. Further, the optical holding member is disposed behind the cover part.

JP 2012-123136 A

The camera described in Patent Document 1 is a mirrorless camera, and the thickness of the main body (the thickness of the lens in the optical axis direction) is thin. On the other hand, in the market, there is a demand for further thinning of the main body. SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging apparatus capable of making a camera body having an imaging element thinner than before.

In order to solve the above-described problems, an imaging apparatus according to the present invention includes a camera body having an imaging element, wherein one side in a direction orthogonal to the imaging surface of the imaging element is a subject side, and the opposite side of the subject side is an anti-subject side. Then, an opening is formed on the surface of the camera body on the subject side, and the camera body has an optical filter disposed on the subject side of the image sensor, a holding member that holds at least the optical filter, and an opening portion. A small second opening is formed, and a cover member is disposed on the side opposite to the subject from the opening, and a part of the holding member is disposed in the second opening. And

In the imaging apparatus of the present invention, a part of the holding member that holds the optical filter is disposed in the second opening of the cover member. Therefore, in the present invention, it is possible to make the camera body thinner as compared with the case where the optical holding member is arranged behind the cover as in the camera described in Patent Document 1. That is, according to the present invention, the camera body can be made thinner than before.

In the present invention, since a part of the holding member that holds the optical filter is disposed in the second opening of the cover member, the distance between the subject-side surface of the camera body and the imaging surface of the image sensor Can be brought closer. Therefore, according to the present invention, for example, when the interchangeable lens is attached to the subject side of the camera body, it is possible to increase the degree of design freedom when designing the back focus of the optical system constituting the interchangeable lens to be short.

In the present invention, for example, the holding member is formed in a cylindrical shape with a bottom having a cylindrical portion formed in a cylindrical shape and a bottom portion connected to the cylindrical portion so as to close the subject side end of the cylindrical portion. A third opening smaller than the second opening is formed, the optical filter is disposed so as to contact the surface on the side opposite to the subject, and the image sensor is disposed on the inner peripheral side of the cylindrical portion. , At least a portion of the bottom is disposed in the second opening.

Further, in the present invention, for example, the camera body includes a mount member for mounting an interchangeable lens that is detachably attached to the camera body, and a mount holding member that holds the mount member, and the opening is formed in the mount member. The cover member is formed and constitutes a part of the mount holding member.

In the present invention, the mount holding member includes a fixing member having an annular fixing portion to which the mounting member is fixed, the mounting member is fixed to the subject side surface of the fixing portion, and the cover member is an anti-subject of the fixing portion. Preferably, the fixing member is made of metal, and the cover member is made of resin. With this configuration, the mount holding member can be reduced in weight and thickness while securing the strength of the mount holding member.

In the present invention, the camera body includes a circuit board on which an image sensor is mounted and fixed to a holding member, the image sensor is mounted on a surface of the circuit board on the subject side, and the circuit board is an anti-subject of the holding member. Preferably, the screw is fixed to the holding member by a screw, and the head of the screw is preferably arranged on the opposite side of the circuit board. With this configuration, it is possible to reduce the distance between the cover member and the holding member in the optical axis direction as compared with the case where the screw head is disposed on the subject side of the holding member. Therefore, the camera body can be made thinner.

In the present invention, the cover member is formed with a protrusion protruding toward the non-subject side, and the holding member is formed with an insertion hole into which the protrusion is inserted. It is preferable that an adhesive for fixing the holding member to the cover member is filled between the peripheral surface. If comprised in this way, after adjusting the inclination of the holding member with respect to a cover member, it will become possible to fix a holding member to a cover member with an adhesive agent. The inclination of the holding member with respect to the cover member can be adjusted and the holding member can be fixed to the cover member using a plurality of screws and a plurality of compression coil springs through which the plurality of screws are inserted. However, in this case, the camera body is thicker than when the holding member is fixed to the cover member with an adhesive filled between the outer peripheral surface of the protrusion and the inner peripheral surface of the insertion hole.

In the present invention, an interchangeable lens can be attached to and detached from the camera body. The camera body includes a plurality of connection terminals for electrically connecting the interchangeable lens and the camera body, and an anti-subject of the plurality of connection terminals. A flexible printed circuit board that comes into contact with the side edges and a substrate support member that supports the surface of the flexible printed circuit board on the side opposite to the subject are formed, and the holding member is formed with a notch in which at least a part of the substrate support member is disposed It is preferable that If comprised in this way, since at least one part of a board | substrate support member is arrange | positioned in the notch part formed in a holding member, it becomes possible to make a camera main body thinner.

In the present invention, an interchangeable lens can be attached to and detached from the camera body, and the camera body includes a plurality of connection terminals for electrically connecting the interchangeable lens and the camera body, and a plurality of connection terminals are connected to each other. The subject side end is preferably arranged on the side opposite to the subject side of the surface of the image sensor. If comprised in this way, it will become possible to make a camera main body thinner.

As described above, in the imaging apparatus of the present invention, the camera body having the imaging element can be made thinner than before.

It is sectional drawing of the imaging device concerning embodiment of this invention. It is sectional drawing of the camera main body shown in FIG. It is a perspective view which shows the state which removed the case, the rear cover, etc. from the camera main body shown in FIG. 2 from the front side. It is a perspective view which shows the state which removed the case, the rear cover, etc. from the camera main body shown in FIG. 2 from the back side. FIG. 3 is a front view showing a state where a cover member, a case, a rear cover, and the like are removed from the camera body shown in FIG. 2. FIG. 3 is a rear view of the camera body shown in FIG. 2 with an image sensor, a circuit board, a case, a rear cover, and the like removed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Schematic configuration of imaging device)
FIG. 1 is a cross-sectional view of an imaging apparatus 1 according to an embodiment of the present invention.

The imaging apparatus 1 of the present embodiment includes a camera body 2 and an interchangeable lens 3 that is detachably attached to the camera body 2. That is, the interchangeable lens 3 can be attached to and detached from the camera body 2. In this embodiment, the interchangeable lens 3 is detachably attached to the camera body 2 by a bayonet type connection mechanism. The interchangeable lens 3 is formed in a substantially cylindrical shape as a whole, and the axial direction of the interchangeable lens 3 formed in a substantially cylindrical shape matches the direction of the optical axis L (optical axis direction) of the interchangeable lens 3. ing.

When one side of the interchangeable lens 3 in the optical axis direction is the subject side and the opposite side of the subject side (the other side in the optical axis direction) is the non-subject side (imaging side), the interchangeable lens 3 is located with respect to the camera body 2. The camera body 2 is disposed on the side opposite to the subject with respect to the interchangeable lens 3. In the following description, the subject side (Z1 direction side in FIG. 1 and the like) is referred to as the “front” side, and the anti-subject side (Z2 direction side in FIG. 1 and the like) is referred to as the “rear (rear)” side. In the following description, the radial direction of the interchangeable lens 3 (that is, the direction orthogonal to the optical axis L) is referred to as “radial direction”, and the circumferential direction of the interchangeable lens 3 (circumferential direction, that is, the axis of the interchangeable lens 3 is defined). The circumferential direction) is referred to as “circumferential direction”.

The interchangeable lens 3 includes a plurality of optical lenses 5 and a lens barrel 6 that holds the optical lenses 5. The interchangeable lens 3 also includes a focus lens 7 disposed behind the plurality of optical lenses 5 and a focus adjustment mechanism (not shown) that moves the focus lens 7 in the front-rear direction (optical axis direction). Yes. The focus adjustment mechanism includes a motor, a lead screw, a nut member, and the like, and is disposed inside the lens barrel 6. Note that a shutter and a shutter drive mechanism (not shown) are also arranged inside the lens barrel 6.

An annular mount member 8 for attaching the interchangeable lens 3 to the camera body 2 is fixed to the rear end portion of the lens barrel 6. The mount member 8 is formed with bayonet claws. A cover member 9 is fixed to the inner peripheral side of the mount member 8. In the center of the cover member 9, an opening 9a penetrating in the front-rear direction is formed. The optical axis L passes through the center of the opening 9a, and light that passes through the focus lens 7 and enters an imaging device 11 described later passes through the opening 9a. A plurality of connection terminals (not shown) for electrically connecting the interchangeable lens 3 and the camera body 2 are fixed to the cover member 9.

(Camera body configuration)
FIG. 2 is a cross-sectional view of the camera body 2 shown in FIG. FIG. 3 is a perspective view showing the state in which the case 19 and the rear cover 20 are removed from the camera body 2 shown in FIG. 2 from the front side. FIG. 4 is a perspective view showing the state where the case 19 and the rear cover 20 are removed from the camera body 2 shown in FIG. 2 from the back side. FIG. 5 is a front view of the camera body 2 shown in FIG. 2 with the case 19, the rear cover 20, the cover member 26, and the like removed. FIG. 6 is a rear view of the camera body 2 shown in FIG. 2 with the image sensor 11, the circuit board 12, the case 19, the rear cover 20, and the like removed.

The camera body 2 includes an image sensor 11 such as a C-MOS image sensor, a circuit board 12 on which the image sensor 11 is mounted, an optical filter 13 disposed on the front side of the image sensor 11, an image sensor 11, and a circuit board 12. And a holding member 14 for holding the optical filter 13. The camera body 2 includes a mount member 15 for mounting the interchangeable lens 3, a mount holding member 16 for holding the mount member 15, and a plurality of electrically connecting the interchangeable lens 3 and the camera body 2. A connection terminal 17 and a terminal holding member 18 that holds the plurality of connection terminals 17 are provided. Furthermore, the camera body 2 includes a substantially cylindrical case 19 that forms the outer peripheral surface of the camera body 2 and a rear cover 20 that forms the rear surface of the camera body 2.

The circuit board 12 is a rigid board formed in a flat plate shape. The circuit board 12 is arranged so that the thickness direction of the circuit board 12 and the front-rear direction coincide. The circuit board 12 is formed with four through holes (not shown) through which screws 22 described later are inserted. The optical filter 13 is a low-pass filter or an IR cut filter.

The image sensor 11 is formed in a rectangular flat plate shape and is mounted on the front surface of the circuit board 12. The image sensor 11 is arranged so that the thickness direction of the image sensor 11 and the front-rear direction coincide. The optical axis L of the optical lens 5 when the interchangeable lens 3 is attached to the camera body 2 passes through the center of the image sensor 11. The front surface of the image sensor 11 is an imaging surface of the image sensor 11. That is, the imaging surface of the imaging element 11 is disposed so as to be orthogonal to the front-rear direction. The front side (subject side) is one side in the direction orthogonal to the imaging surface of the image sensor 11, and the rear side (counter subject side) is the other side in the direction orthogonal to the imaging surface of the image sensor 11. It has become.

In the following description, one of the directions orthogonal to the front-rear direction and parallel to the short side of the imaging element 11 formed in a rectangular shape (the Y1 direction in FIG. 1 and the like) is the upward direction, and is opposite to the upward direction. The direction (Y2 direction in FIG. 1 etc.) is the downward direction. In addition, a direction (X direction in FIG. 1 and the like) orthogonal to the front-rear direction and the up-down direction is the left-right direction.

The holding member 14 is formed in a cylindrical shape with a bottom having a cylindrical portion 14a formed in a cylindrical shape and a bottom portion 14b connected to the front end of the cylindrical portion 14a so as to close the front end of the cylindrical portion 14a. At the center of the bottom part 14b, an opening part 14c is formed as a third opening part penetrating in the front-rear direction. On the rear end side of the cylindrical portion 14a, a flange portion 14d that extends outward in the radial direction is formed. The cylinder part 14a is formed in the shape of a flat square cylinder. The shape of the cylindrical portion 14a when viewed from the front-rear direction is a rectangular frame shape with the left-right direction as the longitudinal direction. Moreover, the shape of the opening part 14c when it sees from the front-back direction is a rectangular shape which makes the left-right direction a longitudinal direction.

The collar portion 14d is formed in a substantially rectangular frame shape. The notch part 14e is formed in the collar part 14d. As shown in FIG. 6, the flange portion 14d has three insertion holes 14f and four screw holes 14g. The notch portion 14e is formed so as to be cut away from the lower end of the holding member 14 toward the upper side, and is formed on the lower side of the cylindrical portion 14a. Moreover, the notch part 14e is formed in the center position of the left-right direction. The shape of the notch 14e when viewed from the front-rear direction is a substantially rectangular shape with the left-right direction as the longitudinal direction.

The insertion hole 14f is formed so as to penetrate the flange 14d in the front-rear direction. The insertion hole 14f is formed in a round hole shape. Of the three insertion holes 14f, one insertion hole 14f is formed at the upper end side of the flange portion 14d and at the center position in the left-right direction. Each of the remaining two insertion holes 14f is formed on the lower end side of the flange portion 14d and on both end sides in the left-right direction. The screw hole 14g is formed from the rear surface of the flange portion 14d toward the front side. Of the four screw holes 14g, each of the two screw holes 14g is formed on each of the left and right sides of the insertion hole 14f formed on the upper end side of the flange portion 14d. Each of the remaining two screw holes 14g is formed on both sides of the notch 14e in the left-right direction.

The circuit board 12 is disposed behind the holding member 14. The circuit board 12 is fixed to the holding member 14 with screws 22. In this embodiment, the circuit board 12 is fixed to the holding member 14 by four screws 22. The shaft portion of the screw 22 is inserted into a through hole formed in the circuit board 12 and is screwed into the screw hole 14g. That is, the circuit board 12 is fixed to the collar part 14d in a state where the front surface of the circuit board 12 is in contact with the rear surface of the collar part 14d. The head 22 a of the screw 22 is disposed on the rear side of the circuit board 12. Note that a notch is formed at a position corresponding to the insertion hole 14f of the circuit board 12 so that the insertion hole 14f is not covered by the circuit board 12 from the rear side (see FIG. 4).

The image sensor 11 is mounted on the front surface of the circuit board 12 as described above, and is held by the holding member 14 via the circuit board 12. The image sensor 11 is disposed on the inner peripheral side of the cylindrical portion 14 a of the holding member 14. Further, the image sensor 11 is disposed on the rear side of the bottom portion 14b. The optical filter 13 is disposed so as to contact the rear surface of the bottom portion 14b. The optical filter 13 is arranged so as to cover the entire opening 14c from the rear side.

Between the image sensor 11 and the optical filter 13 in the front-rear direction, an elastic body 23 formed in a square ring shape is disposed. The elastic body 23 is made of, for example, polyurethane foam. The inner peripheral surface of the elastic body 23 is disposed on the inner peripheral side with respect to the outer peripheral end of the optical filter 13, and the outer peripheral surface of the elastic body 23 is disposed on the outer peripheral side with respect to the outer peripheral end of the optical filter 13. The optical filter 13 is pressed against the rear surface of the bottom portion 14 b by the elastic force of the elastic body 23.

The mount member 15 constitutes the front end portion of the camera body 2. The mount member 15 is formed in an annular shape. That is, a circular opening 15 a is formed on the front surface of the camera body 2. The front surface of the mount member 15 is a plane orthogonal to the front-rear direction. The mount member 15 is formed with bayonet claws 15b. In this embodiment, the interchangeable lens 3 is attached to the camera body 2 when the bayonet claw and the bayonet claw 15 b of the mount member 8 are engaged.

The mount holding member 16 includes a fixing member 25 having an annular fixing portion 25a to which the mounting member 15 is fixed, and a cover member 26 that covers the front surface of the flange portion 14d of the holding member 14. The fixing member 25 is made of metal. Specifically, the fixing member 25 is formed of an aluminum alloy. The fixing member 25 is formed by aluminum die casting using a mold. The cover member 26 is made of resin. The cover member 26 is formed by resin molding using a mold.

The fixing portion 25a is formed in an annular shape. The outer diameter of the fixed portion 25 a is substantially equal to the outer diameter of the mount member 15. The fixing member 25 includes an arcuate protruding portion 25b that protrudes backward from two locations on the upper end side of the fixing portion 25a and one location on the lower end side of the fixing portion 25a. The protrusion 25b is an arcuate curved plate having the center of curvature at the center of the fixed portion 25a. Further, the radius of curvature of the outer surface of the protruding portion 25b in the radial direction is equal to the radius of curvature of the fixed portion 25a. The outer surface of the protruding portion 25b in the radial direction is connected to the outer peripheral surface of the fixed portion 25a.

The mount member 15 is fixed to the front surface of the fixing portion 25a. Specifically, the mount member 15 is fixed to the front surface of the fixing portion 25 a by a plurality of screws 27. On the front surface of the mount member 15, a recess in which the head of the screw 27 is disposed is formed.

The cover member 26 is formed in a substantially disc shape. The cover member 26 is disposed so that the thickness direction of the cover member 26 matches the front-rear direction. The cover member 26 is disposed behind the mount member 15. That is, the cover member 26 is disposed behind the opening 15a. Further, the cover member 26 is configured as a part of the mount holding member 16 by being fixed to the rear surface of the fixing portion 25a. Further, the cover member 26 is fixed to the rear surface of the fixing portion 25a by a plurality of screws 28. On the rear surface of the cover member 26, a recess in which the head of the screw 28 is disposed is formed.

At the center of the cover member 26, an opening 26a as a second opening penetrating in the front-rear direction is formed. The shape of the opening 26a when viewed from the front-rear direction is a rectangular shape whose longitudinal direction is the left-right direction. The opening 26a is smaller than the opening 15a. The opening 26 a is larger than the opening 14 c of the holding member 14. The opening 15a, the opening 26a, and the opening 14c are arranged so that the center of the opening 15a, the center of the opening 26a, and the center of the opening 14c coincide when viewed from the front-rear direction. The optical axis L passes through the centers of the

openings

14c, 15a, and 26a.

Also, the cover member 26 is formed with an arrangement hole 26b in which the terminal holding member 18 is arranged and a protrusion (boss) 26c to be inserted into the insertion hole 14f of the holding member 14. The arrangement hole 26b is formed below the opening 26a. Moreover, the arrangement | positioning hole 26b has penetrated the cover member 26 in the front-back direction. The protrusion 26 c is formed in a columnar shape that protrudes from the rear surface of the cover member 26 toward the rear side. The outer diameter of the protrusion 26c is smaller than the inner diameter of the insertion hole 14f.

The protrusions 26c are formed at three locations, and each of the three protrusions 26c is inserted into each of the three insertion holes 14f. That is, one of the three protrusions 26 c is formed at the upper end side of the rear surface of the cover member 26 and at the center position in the left-right direction. Each of the remaining two protrusions 26c is formed on the lower end side of the rear surface of the cover member 26 and on both end sides in the left-right direction.

The holding member 14 with the image pickup device 11, the circuit board 12, and the optical filter 13 attached thereto is adhesively fixed to the cover member 26. Specifically, the holding member 14 is fixed to the cover member 26 by an adhesive 31 (see FIG. 2) filled between the outer peripheral surface of the protrusion 26c and the inner peripheral surface of the insertion hole 14f. That is, the adhesive 31 that fixes the holding member 14 to the cover member 26 is filled between the outer peripheral surface of the protrusion 26c and the inner peripheral surface of the insertion hole 14f.

In a state where the holding member 14 is fixed to the cover member 26, a part of the holding member 14 is disposed in the opening 26a. Specifically, the front end portion and the bottom portion 14b of the cylindrical portion 14a are disposed in the opening portion 26a. That is, the front end portion and the bottom portion 14b of the cylindrical portion 14a and the cover member 26 overlap in the radial direction. In the camera body 2, the imaging surface (front surface) of the imaging device 11 disposed behind the

openings

15 a and 14 c is exposed through the optical filter 13, and the interchangeable lens 3 is provided on the imaging surface of the imaging device 11. The transmitted light can be incident.

The terminal holding member 18 has a plurality of through holes in which the connection terminals 17 are arranged. The through hole penetrates the terminal holding member 18 in the front-rear direction. The terminal holding member 18 is fixed to the cover member 26 in a state where the terminal holding member 18 is arranged in the arrangement hole 26 b of the cover member 26. Further, the terminal holding member 18 is disposed on the front side of the notch portion 14 e of the holding member 14.

The connection terminal 17 is formed of a conductive material having conductivity, and is formed in a substantially cylindrical shape. The plurality of connection terminals 17 are held by the terminal holding member 18 so that the axial direction and the front-rear direction of the connection terminals 17 formed in a substantially cylindrical shape coincide with each other. The plurality of connection terminals 17 are inserted and held in the through holes of the terminal holding member 18 so as to be movable in the front-rear direction, and are biased forward by a spring (not shown). The front ends of the plurality of connection terminals 17 are disposed on the front surface of the cover member 26.

The camera body 2 of this embodiment includes ten connection terminals 17. The ten connection terminals 17 are arranged in an arc shape in the circumferential direction, and the connection terminals 17 arranged in an arc shape are arranged in two rows in the radial direction. Specifically, the four connection terminals 17 are arranged in a circular arc shape in the circumferential direction at regular intervals, and the remaining six connection terminals 17 are radially outside of the four connection terminals 17. They are arranged in a circular arc shape in the circumferential direction at regular intervals.

As shown in FIG. 2, the rear ends of the plurality of connection terminals 17 are arranged behind the front surface (imaging surface) of the image sensor 11. The rear ends of the plurality of connection terminals 17 are in contact with one end portion 33a of a flexible printed circuit board 33 (hereinafter referred to as FPC (Flexible Printed Circuits) 33). The other end of the FPC 33 is connected to a connector 34 mounted on the rear surface of the circuit board 12. The connection terminal 17 is electrically connected to the circuit board 12 via the FPC 33.

A substrate support member 35 that supports the rear surface of the one end portion 33 a is disposed behind the one end portion 33 a of the FPC 33. As shown in FIG. 6, the substrate support member 35 includes a support portion 35 a that supports the one end portion 33 a and a fixed portion 35 b that is fixed to the rear surface of the cover member 26. The to-be-fixed part 35b is arrange | positioned at each of the both sides of the left-right direction of the support part 35a. The fixed portion 35 b is fixed to the rear surface of the cover member 26 with a screw 36. The support part 35a is arrange | positioned in the notch part 14e of the holding member 14, as shown in FIG.

The case 19 is formed in a substantially cylindrical shape. The case 19 covers the outer peripheral surface of the mount member 15 and the outer peripheral surface of the fixing member 25. Specifically, the case 19 covers the outer peripheral surface of the portion excluding the front end portion of the mount member 15 and the entire outer peripheral surface of the fixing member 25. The rear cover 20 is fixed to the rear end surface of the case 19 so as to close the rear end of the case 19.

(Main effects of this form)
As described above, the imaging apparatus 1 of the present embodiment includes the camera body 2 having the imaging element 11, and the opening 15 a is formed on the front surface of the camera body 2. In this embodiment, the camera body 2 includes an optical filter 13 disposed on the front side of the image sensor 11, a holding member 14 that holds the image sensor 11 and the optical filter 13, and an opening 26a that is smaller than the opening 15a. And a cover member 26 that is formed and disposed behind the opening 15a. Furthermore, in this embodiment, a part of the holding member 14 is arranged in the opening 26a.

Thus, in this embodiment, a part of the holding member 14 that holds the image sensor 11 and the optical filter 13 is disposed in the opening 26 a of the cover member 26. Therefore, in this embodiment, it is possible to make the camera body 2 thinner as compared with the case where the optical holding member is arranged behind the cover as in the camera described in Patent Document 1. That is, in this embodiment, the camera body 2 can be made thinner than before.

In this embodiment, since a part of the holding member 14 that holds the image sensor 11 is disposed in the opening 26a of the cover member 26, the front surface of the camera body 2 (the front surface of the mount member 15) and the image sensor. 11 can be made closer to the imaging surface (the front surface of the imaging device 11). Therefore, in this embodiment, when the interchangeable lens 3 having an optical system with a short back focus is attached to the camera body 2, the degree of freedom in designing an optical system with a short back focus can be increased. That is, when the distance between the front surface of the camera body 2 and the imaging surface of the image sensor 11 is increased, when the interchangeable lens 3 having an optical system with a short back focus is attached to the camera body 2, there is no optical inside the camera body 2. A part of the system must be inserted. When designing the optical lens 5 and the interchangeable lens 3 in which a part of the optical system is inserted into the camera body 2, the lens diameter of the lens element arranged on the rear side of the optical lens 5 is reduced and the lens The rear side of the lens barrel 6 also needs to be miniaturized, which tends to limit the design of an optical system with a short back focus. However, in this embodiment, even if the back focus is designed to be short, it is not necessary to insert a part of the optical system inside the camera body 2, so that the design of the optical system with a short back focus is less likely to occur.

Further, when a configuration in which a part of the optical system is inserted into the camera body 2 is not employed, the distance between the front surface of the camera body 2 and the imaging surface of the image sensor 11 is set as a minimum as the back focus of the interchangeable lens 3. It is necessary to secure the limit. That is, regarding the shortening of the back focus of the interchangeable lens 3, the distance between the front surface of the camera body 2 and the imaging surface of the imaging element 11 is limited. On the other hand, increasing the back focus of the interchangeable lens 3 can be dealt with by increasing the distance between the front surface of the camera body 2 and the optical lens 5. That is, in designing the interchangeable lens 3, it is difficult to be restricted by the camera body 2 with respect to increasing the back focus, and a relatively free design can be performed. Therefore, by shortening the distance between the front surface of the camera body 2 and the imaging surface of the image sensor 11, the degree of freedom in designing the interchangeable lens 3 can be increased in addition to making the camera body 2 thinner.

In this embodiment, the holding member 14 is formed in a cylindrical shape with a bottom having a cylindrical portion 14a formed in a cylindrical shape and a bottom portion 14b connected to the cylindrical portion 14a so as to close the front end of the cylindrical portion 14a. ing. An opening 14c smaller than the opening 26a is formed in the bottom 14b. The optical filter 13 is disposed so as to come into contact with the rear surface of the bottom portion 14b. The image sensor 11 is disposed on the inner peripheral side of the cylindrical portion 14a. Further, at least the bottom 14b is disposed in the opening 26a. As described above, a part of the cylindrical portion 14a including the bottom portion 14b formed in the holding member 14 is inserted into the opening 26a formed in the cover member 26 from the rear side, thereby being arranged on the inner peripheral side of the cylindrical portion 14a. It becomes possible to bring the imaging surface of the imaging device 11 to be closer to the front surface of the camera body 2. Therefore, the camera body 2 can be thinned in the front-rear direction, and the back focus of the optical lens 5 of the interchangeable lens 3 can be designed to be shorter. Note that the entire bottom 14b may be disposed in the second opening 26a as in the present embodiment, but if at least part of the bottom 14b is disposed in the second opening 26a, the camera The thickness of the main body 2 and the degree of freedom in designing the interchangeable lens 3 can be increased.

The camera body 2 includes a mount member 15 for mounting the interchangeable lens 3 detachably attached to the camera body 2 and a mount holding member 16 for holding the mount member 15. The opening 15 a is formed in the mount member 15. Further, the cover member 26 constitutes a part of the mount holding member 16. Since the thickness of the components of the mount holding member 16 can be secured and the configuration of the mount holding member 16 is simple, the mount holding member 16 can be formed with high accuracy. Therefore, by providing an installation surface for installing the mount member 15 on the mount holding member 16, it becomes possible to suppress distortion and inclination of the front surface of the mount member 15. Further, since the cover member 26 having the opening 26a constitutes a part of the mount holding member 16, the opening 15a and the opening are fixed by fixing the mount member 15 having the opening 15a to the mount holding member 16. It becomes possible to perform alignment with 26a with high precision.

As in this embodiment, the mount holding member 16 includes a fixing member 25 having an annular fixing portion 25a to which the mounting member 15 is fixed. The mounting member 15 is fixed to the front surface of the fixing portion 25a, and the cover member 26 is The fixing member 25 is fixed to the rear surface, the fixing member 25 is preferably made of metal, and the cover member 26 is preferably made of resin. This makes it possible to secure the strength of the fixing member 25 as compared to the case where the fixing member 25 is made of resin. Therefore, when the interchangeable lens 3 is attached to the camera body 2, It becomes possible to suppress a fall and a twist. In addition, since the cover member 26 does not require strength as compared with the fixing member 25, it is possible to reduce the thickness of the cover member 26 in the front-rear direction. However, when the cover member 26 is made of metal, Specifically, the cover member 26 is formed by aluminum die casting. When the cover member 26 is molded by aluminum die-casting, there is a limit in reducing the plate thickness of the cover member 26 as a manufacturing restriction. Therefore, the cover member 26 is compared with the case where the cover member 26 is a resin molded product. This is disadvantageous in reducing the thickness and weight of 26. Therefore, by forming the fixing member 25 with metal and forming the cover member 26 with resin, it is possible to reduce the weight of the mount holding member 16 while ensuring the strength of the mount holding member 16.

As in the present embodiment, the camera body 2 includes the circuit board 12 on which the imaging element 11 is mounted and fixed to the holding member 14, and the imaging element 11 is mounted on the front surface of the circuit board 12. It is preferable that the screw 22 is disposed behind the holding member 14 and is fixed to the holding member 14 with a screw 22, and the head 22 a of the screw 22 is disposed behind the circuit board 12. In this way, the distance between the cover member 26 and the holding member 14 in the front-rear direction (optical axis direction) can be reduced as compared with the case where the head portion 22a of the screw 22 is disposed on the front side of the holding member 14. It becomes possible. Therefore, the camera body 2 can be made thinner.

As in the present embodiment, the cover member 26 is formed with a protruding portion 26c that protrudes rearward, and the holding member 14 is formed with an insertion hole 14f into which the protruding portion 26c is inserted. It is preferable that an adhesive 31 for fixing the holding member 14 to the cover member 26 is filled between the outer peripheral surface and the inner peripheral surface of the insertion hole 14f. In this way, it is possible to fix the holding member 14 to the cover member 26 with the adhesive 31 after adjusting the inclination of the holding member 14 with respect to the cover member 26. That is, it is possible to fix the holding member 26 to the cover member 26 with the adhesive 31 after adjusting the inclination of the imaging element 11 with respect to the front surface of the mount member 15. The inclination of the holding member 14 with respect to the cover member 26 is adjusted and the holding member 14 is fixed to the cover member 26 using a plurality of screws and a plurality of compression coil springs through which the plurality of screws are inserted. Is possible. However, in this case, the camera body is compared with the case where the holding member 14 is fixed to the cover member 26 with the adhesive 31 filled between the outer peripheral surface of the protrusion 26c and the inner peripheral surface of the insertion hole 14f. 2 becomes thicker.

As in this embodiment, the interchangeable lens 3 can be attached to and detached from the camera body 2, and the camera body 2 includes a plurality of connection terminals 17 for electrically connecting the interchangeable lens 3 and the camera body 2. The FPC 33 that contacts the rear ends of the plurality of connection terminals 17 and the substrate support member 35 that supports the rear surface of the FPC 33 are provided. The holding member 14 has a notch 14e in which a part of the substrate support member 35 is disposed. Is preferably formed. In this case, since at least a part of the substrate support member 35 is disposed in the notch portion 14e formed in the holding member 14, the camera body 2 can be made thinner.

As in this embodiment, the interchangeable lens 3 can be attached to and detached from the camera body 2, and the camera body 2 has a plurality of connection terminals 17 for electrically connecting the interchangeable lens 3 and the camera body 2. The rear ends of the plurality of connection terminals 17 are preferably arranged behind the front surface of the image sensor 11. In this way, the camera body 2 can be made thinner.

(Other embodiments)
In the embodiment described above, the mount holding member 16 is configured by fixing the fixing member 25 and the cover member 26 which are formed separately, but the fixing member 25 and the cover member 26 are integrally formed. May be. In the above-described embodiment, the bottom portion 14b of the holding member 14 is disposed on the same plane as the front surface of the cover member 26. However, the bottom portion 14b protrudes more forward than the front surface of the cover member 26. The cover member 26 may be disposed behind the front surface of the cover member 26.

In the embodiment described above, at least a part of the substrate support member 35 is arranged in the notch portion 14e formed in the holding member 14, but not only the substrate support member 35 is included in the notch portion 14e. In addition, at least a part of the connection terminal 17, the terminal holding member 18, and the flexible printed circuit board 33 may be disposed. In the above-described embodiment, the imaging device 1 is an interchangeable lens type imaging device having the interchangeable lens 3 that is detachably attached to the camera body 2, but the imaging device to which the present invention is applied is attached to the camera body 2. A lens-integrated imaging apparatus having a fixed lens barrel may be used.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Camera main body 3 Interchangeable lens 11 Imaging element 12 Circuit board 13 Optical filter 14 Holding member

14a Tube part

14b Bottom part 14c Opening part (3rd opening part)

14e Notch portion

14f Insertion hole 15 Mount member 15a Opening portion 16 Mount holding member 17 Connection terminal 22 Screw 22a Head portion 25 Fixing member 25a Fixing portion 26 Cover member 26a Opening portion (second opening portion)
26c Projection 31 Adhesive 33 FPC (Flexible Printed Circuit Board)
35 Substrate support member Z1 Subject side Z2 Opposite subject side

Claims

A camera body having an image sensor;
When one side of the direction orthogonal to the imaging surface of the image sensor is the subject side and the opposite side of the subject side is the anti-subject side,
An opening is formed on the subject side surface of the camera body,
The camera body is formed with an optical filter disposed on the subject side of the image sensor, a holding member that holds at least the optical filter, and a second opening that is smaller than the opening, and from the opening. And a cover member arranged on the opposite subject side,
A part of the holding member is disposed in the second opening.
The holding member is formed in a cylindrical shape with a bottom having a cylindrical portion formed in a cylindrical shape, and a bottom portion connected to the cylindrical portion so as to close an object side end of the cylindrical portion,
A third opening smaller than the second opening is formed at the bottom,
The optical filter is disposed so as to come into contact with the surface of the bottom opposite the subject,
The image sensor is disposed on the inner peripheral side of the cylindrical portion,
The imaging apparatus according to claim 1, wherein at least a part of the bottom is disposed in the second opening.
The camera body includes a mount member for mounting an interchangeable lens that is detachably attached to the camera body, and a mount holding member that holds the mount member,
The opening is formed in the mount member,
The imaging apparatus according to claim 1, wherein the cover member constitutes a part of the mount holding member.
The mount holding member includes a fixing member having an annular fixing portion to which the mount member is fixed;
The mount member is fixed to a surface on the subject side of the fixing portion, and the cover member is fixed to a surface on the side opposite to the subject of the fixing portion,
The imaging apparatus according to claim 3, wherein the fixing member is made of metal, and the cover member is made of resin.
The camera body includes a circuit board on which the imaging element is mounted and fixed to the holding member,
The image sensor is mounted on a subject side surface of the circuit board,
The circuit board is disposed on a side opposite to the subject of the holding member and fixed to the holding member by a screw,
5. The imaging apparatus according to claim 1, wherein a head portion of the screw is disposed on a side opposite to the subject of the circuit board.
The cover member is formed with a protrusion that protrudes toward the non-subject side,
The holding member is formed with an insertion hole into which the protrusion is inserted,
The adhesive agent which fixes the said holding member to the said cover member is filled between the outer peripheral surface of the said projection part, and the inner peripheral surface of the said insertion hole, The any one of Claim 1 to 4 characterized by the above-mentioned. The imaging device described in 1.
An interchangeable lens is detachable from the camera body,
The camera body includes a plurality of connection terminals for electrically connecting the interchangeable lens and the camera body, a flexible printed circuit board in contact with opposite ends of the plurality of connection terminals, and the flexible printed circuit board A substrate support member that supports the surface on the side opposite to the subject,
5. The imaging apparatus according to claim 1, wherein the holding member is formed with a cutout portion in which at least a part of the substrate support member is disposed.
An interchangeable lens is detachable from the camera body,
The camera body includes a plurality of connection terminals for electrically connecting the interchangeable lens and the camera body,
5. The image pickup apparatus according to claim 1, wherein ends of the plurality of connection terminals on the side opposite to the subject are arranged on the side opposite to the subject than the surface on the subject side of the imaging element.