JP2020101612A - Bayonet coupling mount structure - Google Patents

Abstract

To provide a bayonet coupling mount structure that enables a simple configuration to surely secure required strength.SOLUTION: A bayonet coupling mount structure comprises: a mount ring 12 that has three main body-side bayonet pawls 12a, 12b and 12c formed along a rim part of an opening part 12d, and has first reception parts 12xa, 12xb, 12xc and 12xd for receiving accessory-side bayonet pawls 22a, 22b and 22c formed on each rear face-side of the three main body-side bayonet pawls; and a main body 11 in which a screw part for anchoring the mount ring via a screw is provided, and the screw part forms a first virtual quadrangle A in four locations on an outer side of an opening part 11a. At least one of the first reception parts is formed in each main body-side bayonet pawl, and as a whole, a second virtual quadrangle B is formed in four locations as a whole. When the main body-side bayonet pawl couples to the accessory-side bayonet pawl via a bayonet, the second virtual quadrangle is located inside the first virtual quadrangle.SELECTED DRAWING: Figure 5

Description

The present invention relates to a mount structure that is applied to, for example, an interchangeable lens type image pickup device and the like, and performs a bayonet connection between an image pickup device body and a lens barrel or a predetermined accessory device.

Conventionally, an optical image formed by an image pickup optical system is sequentially photoelectrically converted into an image signal by using an image pickup device or the like, and an image based on the obtained image signal is sequentially and continuously displayed by a display device. When an instruction signal is generated, an image pickup device such as a digital camera configured to record the image signal at the time of generation of the instruction signal as image data in a predetermined form and display an image based on the recorded image data. Generally put to practical use.

In this type of conventional image pickup apparatus, for example, a so-called lens-interchangeable image pickup apparatus in which a lens barrel having an image pickup optical system is detachably attached to an image pickup apparatus main body is widely used. Further, in a lens-interchangeable image pickup device of this type, a mount structure for connecting the image pickup device body to a lens barrel or a predetermined accessory device is disclosed in, for example, Japanese Utility Model Publication No. 61-24982. Various proposals have been made and put into practical use according to, for example, Japanese Unexamined Patent Publication No. 2007-93956.

The conventional mount structure disclosed in Japanese Utility Model Publication No. 61-24982 and Japanese Patent Application Laid-Open No. 2007-93956 discloses a bayonet connection between the imaging device body and the lens barrel or a predetermined accessory device. Has been applied.

In this case, for example, when the main body side mounting member is configured to have three bayonet claws, the lens side mounting member is also configured to include three bayonet claws corresponding to the three main body side bayonet claws. .. Each of the three body side bayonet claws respectively supports the three lens side bayonet claws when the three body side mount member bayonet claws and the lens side mount member three bayonet claws are bayonet coupled. In general, a configuration is provided in which a supporting portion for this is provided. In this configuration, the support portions of the three main body side bayonet claws support the lens side bayonet claws by contacting a part of the three lens side bayonet claws.

In such a conventional mount structure, when the main body side bayonet claw and the lens side bayonet claw are bayonet-coupled and the lens barrel is attached to the image pickup apparatus main body, the lens barrel mainly has the above-mentioned three types. It is supported by the support part. At this time, the three support portions (provided on each of the three main body side bayonet claws) have a role of positioning the optical axis of the lens barrel mounted on the main body of the image pickup apparatus.

That is, the supporting surface including the three supporting portions is a surface substantially parallel to the mounting surface of the main body side mounting member. The mount surface of the main body side mount member is configured to be set substantially parallel to the light receiving surface of the image pickup element provided inside the main body of the image pickup apparatus.

Therefore, it is desirable that the supporting surface including the above-mentioned three supporting portions is set to be parallel to the surface substantially orthogonal to the optical axis of the lens barrel mounted on the image pickup apparatus main body. With this configuration, the optical axis of the lens barrel mounted on the main body of the image pickup apparatus can be positioned so as to be substantially orthogonal to the light receiving surface of the image pickup element.

On the other hand, in a conventional mount structure applied to an image pickup apparatus or the like, the main body side mount member is formed into a substantially annular shape by processing a plate-shaped member such as metal, and the main body side mount member is the image pickup apparatus main body. In general, a plurality of (for example, four) screws or the like are used to fix the front surface of the.

Japanese Utility Model Publication No. 61-24982 JP, 2007-93956, A

However, in the conventional bayonet coupling mount structure disclosed in Japanese Utility Model Publication No. 61-24982, JP-A 2007-93956, etc., for example, three main body side bayonet claws and three lens side bayonet claws are provided. With the configuration including the lens barrel, the lens barrel is supported by the three supporting portions when the lens barrel is mounted on the main body of the imaging device. In this case, the weight load of the lens barrel is concentrated on the three support portions.

As described above, the main body side mounting member is made of a substantially annular plate member, and is structured to be fixed to the front surface of the apparatus main body by using a plurality of screws or the like. For this reason, the main body side mounting member has a difference in strength between, for example, a portion near the screw fixing portion and a portion distant from the screw fixing portion.

Therefore, depending on the arrangement of the three support parts provided on the main body side bayonet claw, when the main body side bayonet claw and the lens side bayonet claw are bayonet-coupled, the support part of the main body side bayonet claw contacts the lens side bayonet claw. Then, when a force for supporting the lens barrel is applied, the main body side bayonet claw may be deformed.

For example, FIG. 10 is a conceptual diagram of a conventional bayonet-mounted mount structure. Here, FIG. 10 shows the case where the lens side mount member 122 (only the outer ruled line is shown by using the dotted line) is bayonet-coupled to the main body side mount member 112 (shown by using the solid line). The state is shown from the back surface side of the main body side mount member 112.

In this case, the main body side mount member 112 is a substantially annular plate member having the opening 112d. The main body side mount member 112 has three main body side bayonet claws 112a, 112b, which are formed so as to project inward in the radial direction of the opening 112d at predetermined intervals along the inner edge of the opening 112d. It has 112c.

Then, three receiving portions (supporting portions) 112xa, 112xb, 112xc for receiving the lens-side bayonet claws 122a, 122b, 122c are formed on the back surfaces of the three main body side bayonet claws 112a, 112b, 112c, respectively. Has been done.

Further, the main body side mount member 112 is configured to be fixed to the front surface of the imaging device main body (not shown) with screws or the like (not shown) in the four screw holes 112ha, 112hb, 112hc, 112hd.

Here, of the three receiving portions 112xa, 112xb, 112xc, the receiving portion 112xa is arranged near the screw hole 112hb (fixed portion). The receiving portion 112xc is arranged near the screw hole 112hd (fixed portion). On the other hand, the receiving portion 112xb is arranged at a position away from any of the four screw holes (fixed portions).

In the case where the three receiving portions 112xa, 112xb, 112xc provided on the main body side bayonet claw are arranged in this manner, the three receiving portions 112xa, 112xb, 112xc (positions apart from the screw holes (fixed portions)) The main body side bayonet claw 112b including the receiving portion 112xb is different from the main body side bayonet claws 112a and 112c including the other two receiving portions 112xa and 112xc (in the positions near screw holes (fixed portions)). It is known that the strength tends to be weak.

Therefore, in the case of the mount structure having such a configuration, the weight load of the mounted lens barrel is concentrated on the weak portion (the receiving portion 112xb of the main body side bayonet claw 112b in the configuration example of FIG. 10). I will end up. From this, there is a possibility that the relevant portion (receiving portion 112xb) may be deformed.

When the main body side bayonet claw is thus deformed, the optical axis of the lens barrel positioned by the supporting surface including the three supporting portions is displaced from the light receiving surface of the image pickup device on the image pickup apparatus main body side. There is a problem of being tilted.

In recent years, the performance of interchangeable lens barrels used in interchangeable lens type image pickup devices has been increasing, and there is a tendency for the overall size to increase. Therefore, the weight of the lens barrel itself tends to increase. Therefore, it is an important design requirement to secure the strength of the main body side mounting member.

The present invention has been made in view of the above points, and an object thereof is to be applied to, for example, a lens-interchangeable image pickup device and the like, and the image pickup device main body and a lens barrel or a predetermined accessory device and the like. It is an object of the present invention to provide a mount structure for bayonet connection, which can ensure a required strength with a simple structure in a mount structure for bayonet connection between spaces.

In order to achieve the above object, a mount structure for bayonet coupling according to an aspect of the present invention is such that three main body side bayonet claws are formed along an edge portion of an opening, and the back surface side of each of the three main body side bayonet claws is formed. Is provided with a mount ring having a first receiving portion for receiving the accessory side bayonet claw and a screw portion for fixing the mount ring with a screw, and the screw portion is provided at four positions outside the opening. A main body forming one virtual quadrangle, and at least one first receiving portion is formed on each of the main body side bayonet claws, and the first receiving portion is formed at four places forming a second virtual quadrangle as a whole. When the side bayonet claw is bayonet-connected to the accessory side bayonet claw, the second virtual quadrangle is located inside the first virtual quadrangle.

According to the present invention, for example, it is applied to an interchangeable lens type image pickup device and the like, and in a mount structure for connecting a bayonet connection between the image pickup device main body and a lens barrel or a predetermined accessory device, it is possible to ensure a necessary strength with a simple structure. It is possible to provide a bayonet coupling mount structure that can be secured.

1 is a schematic perspective view showing an image pickup apparatus including a mount structure for bayonet coupling according to an embodiment of the present invention. FIG. 1 is an external perspective view showing only a main body side mount ring forming a part of the mount structure in the image pickup apparatus of FIG. A plan view of the mount ring (on the back surface side) of the main body of FIG. In the mount structure of the image pickup apparatus of FIG. 1, a main part enlarged perspective view showing a state in which a body side mount ring and a lens side mount ring are bayonet-coupled Plan view of the state of FIG. An enlarged cross-sectional view of the main part taken along the line [6]-[6] in FIG. FIG. 5 is an enlarged cross-sectional view of main parts taken along the line [7]-[7] of FIG. An enlarged cross-sectional view of the main part taken along the line [8]-[8] in FIG. The top view explaining the arrangement structure of the 1st receiving part of the mount structure in the imaging device of FIG. Conceptual diagram showing a conventional bayonet-mounted mount structure

Hereinafter, the present invention will be described with reference to the illustrated embodiments. Each drawing used in the following description is schematically shown, and in order to show each constituent element in a size that can be recognized on the drawing, the dimensional relationship and scale of each member may be different for each constituent element. It may be shown. Therefore, the present invention is limited to the illustrated form with respect to the quantity of each constituent element described in each drawing, the shape of each constituent element, the ratio of the size of each constituent element, the relative positional relationship of each constituent element, and the like. It is not limited.

In one embodiment of the present invention, for example, an optical image formed by an imaging optical system is converted into, for example, a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor). Type photoelectric sensors such as image sensors (hereinafter referred to as image sensors) are sequentially photoelectrically converted, and the image signals obtained by the photoelectric conversion are converted into image data of a predetermined form (for example, digital image data representing a still image or a moving image). ) As an image display device that reproduces and displays a still image or a moving image based on the digital image data recorded in the storage medium (for example, a liquid crystal display (LCD) or organic electroluminescence). It illustrates an image pickup device (for example, a digital camera, a video camera, or the like) configured to include (organic EL; Organic Electro-Luminescence: OEL) display or the like.

In this case, the image pickup apparatus is a so-called lens-interchangeable image pickup apparatus in which the lens barrel is detachably attached to the image pickup apparatus main body.

In the present embodiment, the surface facing the subject when the imaging device is used is referred to as the front surface of the imaging device. The surface that the user faces when using the imaging device is referred to as the back surface of the imaging device. In addition, a surface of the operation member on which the shutter release button is arranged is referred to as an upper surface. The surface facing the upper surface of the imaging device is called the bottom surface. Further, the surfaces arranged on both sides in a normal use state of the image pickup apparatus are referred to as a left side surface and a right side surface. In this case, the left/right discrimination is performed by distinguishing the left side or the right side when viewed from the subject side toward the front surface of the imaging device as the left side or the right side, respectively.

In the present embodiment, the optical axis of the image pickup optical system is represented by the symbol O. In the direction along the optical axis O, the side of the subject facing the front surface of the image pickup apparatus is referred to as the front side of the image pickup apparatus, and the side of the user facing the back side of the image pickup apparatus is referred to as the rear side of the image pickup apparatus. To do.

[One Embodiment]
First, a schematic configuration of an image pickup apparatus including a mount structure for bayonet coupling according to an embodiment of the present invention will be described below. FIG. 1 is a schematic perspective view showing an image pickup apparatus having a mount structure for bayonet coupling according to an embodiment of the present invention. Note that FIG. 1 shows a state in which the lens barrel 20 is removed from the image pickup apparatus main body 10 in order to clearly show the components constituting the bayonet coupling type mount structure of the present embodiment.

The image pickup apparatus 1 according to this embodiment includes an image pickup apparatus body 10 and a lens barrel 20. Here, the image pickup apparatus main body 10 is provided with main constituent members of the image pickup apparatus 1 of the present embodiment, for example, the image pickup element 14 and the like inside and a plurality of operation members (15, 16, 17) and the like on the outer surface, and will be described later. The housing unit is mainly configured by the body main body 11 configured such that the lens barrel 20 can be detachably disposed on the front surface via the mounting structure (12, 22). Further, the lens barrel 20 is a structural unit that includes an image pickup optical system 24 and the like inside and is detachably arranged on the front surface of the image pickup apparatus main body 10 via a mount structure (12, 22) described later. ..

The image pickup apparatus main body 10 includes a body main body 11, a main body side mount ring 12 that is a main body side mount member, various electric components such as an image pickup device 14, a plurality of operation members (15, 16, 17), and a grip. It is mainly configured by the portion 18 and the like.

The body main body 11 is a casing that is a basic constituent member of the imaging device main body 10. Inside the body 11, various kinds of electric components such as the image sensor 14 (details not shown) are housed. A plurality of operating members (15, 16, 17) are arranged on the outer surface of the body 11 at predetermined positions. A battery (not shown) or the like is housed inside the body main body 11 at a portion closer to the left side surface thereof, and a grip portion 18 that a user holds when using the image pickup apparatus 1 is provided.

Examples of the plurality of operation members include a lock release button 15, a shutter release button 16, and other operation members 17 and the like.

The lock release button 15 is an operation member that is operated when the lens barrel 20 mounted on the front surface of the imaging device body 10 is detached using the mount structure (12, 22) of the present embodiment. By operating the lock release button 15, the lock mechanism that locks the connection between the imaging device body 10 and the lens barrel 20 can be released.

The shutter release button 16 is an operation member that is operated when performing a shooting operation using the imaging device 1.

Further, the plurality of operating members 17 include various operating members such as an operation mode switching dial, a parameter setting dial, a push button to which a predetermined function is assigned, a power on/off lever, and the like. It should be noted that these operating members are parts that are not directly related to the present invention, and therefore detailed description thereof is omitted and they are collectively shown as a representative reference numeral 17 in FIG. 1.

Also, various electric parts and the like provided inside the body 11 are not directly related to the present invention, and therefore illustration and detailed description thereof are omitted.

In this case, the image sensor 14 is arranged at a position exposed from the opening 11a of the body 11 as shown in FIG. The image pickup element 14 is arranged substantially parallel to the mount surface of the main body side mount ring 12 fixed to the front surface of the image pickup apparatus main body 10. In this state, the light-receiving surface of the image sensor 14 is arranged facing forward.

The body-side mount ring 12, which is the body-side mount member, is a component that constitutes a part of the bayonet coupling type mount structure of the present embodiment. The main body side mount ring 12 is fixed to the periphery of an opening 11a formed in a substantially central portion of the front surface of the imaging device main body 10.

Here, the configuration of the main body side mount ring 12 will be described in more detail with reference to FIGS. 2 and 3 in addition to FIG. FIG. 2 is an external perspective view showing only the main body side mount ring forming a part of the mount structure of the present embodiment. FIG. 3 is a plan view of the main body side mount ring. 2 and 3 show the back surface side of the main body side mount ring, that is, the side viewed from the arrow [2] direction in FIG.

As shown in FIGS. 2 and 3, the main body side mount ring 12 is formed of a substantially annular plate-shaped member having an opening 12d (opening). The main body side mount ring 12 is provided with three main body side bayonet claws 12a, 12b, 12c at predetermined intervals along the inner peripheral edge of the opening 12d. Each of the main body side bayonet claws 12a, 12b, 12c is formed so as to project inward in the radial direction of the opening 12d.

Further, screw holes 12ha, 12hb, 12hc, which are through holes for inserting the four fixing screws 13a, 13b, 13c, 13d (see FIG. 1), respectively, in the annular portion of the main body side mount ring 12, 12hd is provided. These screw holes 12ha, 12hb, 12hc, 12hd are respectively provided at predetermined positions at predetermined intervals in the circumferential direction of the annular portion of the main body side mount ring 12. The screw holes 12ha, 12hb, 12hc, 12hd are formed at positions corresponding to the four screw portions (see FIG. 1) provided on the front surface of the body body 11.

Here, the four screw portions of the body body 11 are positions where the four fixing screws 13a, 13b, 13c, 13d are provided in FIG. That is, the four screw parts are provided at four places in the vicinity of the outer peripheral edge of the opening 11 a on the front surface of the body 11 of the imaging device body 10. Then, each of the four fixing screws 13a, 13b, 13c, 13d is screwed into the four threaded portions while sandwiching the main body side mount ring 12. In this case, each of the four fixing screws 13a, 13b, 13c, 13d is inserted through each of the screw holes 12ha, 12hb, 12hc, 12hd of the main body side mount ring 12, and then four of the body main body 11 are inserted. Screw it onto the screw part. As a result, the main body side mount ring 12 is screwed to a predetermined position on the front surface of the body main body 11.

Here, the quadrangle formed by connecting the four screw portions of the body 11 with a straight line is referred to as a first virtual quadrangle A. The four threaded portions are provided on the body body 11, but as described above, the four threaded portions are provided on the four screw holes 12ha, 12hb, 12hc, 12hd of the body side mount ring 12, respectively. It is formed at the corresponding position. Therefore, it can be said that the quadrangle formed by connecting the four screw holes 12ha, 12hb, 12hc, 12hd of the main body side mount ring 12 with a straight line is the same as the first virtual quadrangle A. From this, in the following description, the first virtual quadrangle A is “a quadrangle formed by connecting four screw portions of the body 11 with straight lines” and “four screws of the body side mount ring 12”. The holes 12ha, 12hb, 12hc, and 12hd are connected by straight lines to form a "quadrangle" (see FIGS. 2, 3, and 9).

Here, the positions of the four screw parts (four screw holes) forming the first virtual quadrangle A sandwich the predetermined main body side bayonet claw 12a among the three main body side bayonet claws 12a, 12b, 12c. A first screwing position (a position corresponding to the fixing screw 13a and the screw hole 12ha) and a second screwing position (a position corresponding to the fixing screw 13b and the screw hole 12hb), and the predetermined main body side bayonet claw 12a, a third screwing position (a position corresponding to the fixing screw 13c, the screw hole 12hc) and a fourth screw that sandwich the inner edge side of the opening 12d, that is, the region where the main body side bayonet claw does not exist. Stop position (position corresponding to the fixing screw 13d and the screw hole 12hd. In other words, the third screw fixing position and the fourth screw fixing position are positions where no body side bayonet claw is sandwiched. It can be said that

On the other hand, the three lens sides of the lens side mount ring 22 (described later) of the lens barrel 20 are provided on the back sides (the side sides shown in FIGS. 2 and 3) of the three body side bayonet claws 12a, 12b, 12c. First receiving portions (12xa, 12xb, 12xc, 12xd), which are first supporting portions for supporting the bayonet claws 22a, 22b, 22c (described later), are formed respectively. At least one of these first receiving portions (12xa, 12xb, 12xc, 12xd) is formed in each of the main body side bayonet claws 12a, 12b, 12c. In this case, in the mount structure of the present embodiment, the first receiving portions (12xa, 12xb, 12xc, 12xd) are, as shown in FIG. 2 and FIG. 3, formed at the four positions forming the second virtual quadrangle B as a whole. It has been formed.

Specifically, as shown in FIGS. 2 and 3, the first receiving portions 12xa and 12xb are provided on the main body side bayonet claw 12a. The first receiving portion 12xc is provided on the main body side bayonet claw 12c. The first receiving portion 12xd is provided on the main body side bayonet claw 12b.

Here, when the body side mount ring 12 (each of the body side bayonet claws 12a, 12b, 12c) and the lens side mount ring 22 (each of the lens side bayonet claws 22a, 22b, 22c) are bayonet coupled, (4 The second virtual quadrangle B formed by the first receiving portions (12xa, 12xb, 12xc, 12xd) at the locations (formed by the screw portions at four locations and the four screw holes 12ha, 12hb, 12hc, 12hd) It is located inside the first virtual square.

2 and 3 are views showing only the main body side mount ring 12, and do not show the case where the main body side mount ring 12 and the lens side mount ring 22 are bayonet-coupled as described above. Absent. Therefore, the second virtual quadrangle B shown in FIGS. 2 and 3 is an imaginary line that is assumed when the lens-side mount ring 22 is bayonet-coupled to the body-side mount ring 12. A state when the main body side mount ring 12 and the lens side mount ring 22 are bayonet-coupled is as shown in FIGS.

Further, when the lens-side bayonet claws 22a, 22b, 22c are respectively supported by the respective first receiving portions (12xa, 12xb, 12xc, 12xd), they come into contact with the lens-side bayonet claws 22a, 22b, 22c. A protruding portion is formed.

In other words, the first receiving portions (12xa, 12xb, 12xc, 12xd) of the body side bayonet claws 12a, 12b, 12c are formed so as to project from the surfaces of the body side bayonet claws 12a, 12b, 12c.

Then, in this case, each of the first receiving portions (12xa, 12xb, 12xc, 12xd) includes a body side mount ring 12 (each body side bayonet claw) and a lens side mount ring 22 (each lens side bayonet claw). Has a projecting amount sufficient to support the lens-side bayonet claws 22a, 22b, 22c by contacting the opposite surfaces of the lens-side bayonet claws 22a, 22b, 22c when they are coupled to each other.

On the other hand, when the body side mount ring 12 (each body side bayonet claw) and the lens side mount ring 22 (each lens side bayonet claw) are bayonet-coupled, among the three body side bayonet claws 12a, 12b, 12c Each of the two main body side bayonet claws 12b and 12c other than the predetermined main body side bayonet claw 12a of the first virtual quadrangle A outside (outside) the lens side bayonet claws 22b and 22c (described later). In the main body side bayonet claws 12b and 12c, a second receiving portion 12y, which is a second supporting portion, is formed in each predetermined portion.

When the main body side mount ring 12 (each main body side bayonet claw) and the lens side mount ring 22 (each lens side bayonet claw) are bayonet-coupled, each second receiving portion 12y and each corresponding lens side The bayonet claws 22b and 22c are separated from each other by a predetermined distance=D so as not to come into contact with each other (see reference numeral D in FIG. 4 or FIGS. 7 and 8).

Here, the predetermined distance D is a play generated between the main body side bayonet claw and the lens side bayonet claw when the main body side bayonet claw and the lens side bayonet claw are bayonet-coupled. For example, the predetermined distance D is specifically about 0.1 mm.

Returning to FIG. 1, the lens barrel 20 is mainly configured by a lens barrel body 21, a lens side mount ring 22 that is a lens side mount member, and the like.

The lens barrel body 21 is a housing that is a basic constituent member of the lens barrel 20. Inside the lens barrel body 21, an image pickup optical system 24 including a plurality of optical lenses, various mechanism units (not shown) such as a drive mechanism and a diaphragm mechanism of the image pickup optical system 24, and these mechanism units. Various electric parts and the like (not shown) that constitute the drive circuit of FIG. A plurality of operating members (for example, a zoom ring, a focus ring, etc.) are provided on the outer surface of the lens barrel body 21. It should be noted that these various electric parts and the plurality of operating members are parts that are not directly related to the present invention, and thus detailed illustration and detailed description thereof will be omitted.

The lens-side mount ring 22, which is a lens-side mount member, is a component that constitutes another part of the bayonet coupling type mount structure of the present embodiment. The lens-side mount ring 22 is fixed to the periphery of the opening 21a formed on the rear end surface of the lens barrel 20.

That is, the lens-side mount ring 22 is screw-fixed to the rear end surface of the lens barrel body 21 by using a plurality (four) of fixing screws 23. The lens-side mount ring 22 is provided with three lens-side bayonet claws 22a, 22b, 22c along the outer peripheral edge of the opening 21a at predetermined intervals along the outer peripheral direction of the lens-side mount ring 22. Is formed. The lens-side bayonet claws 22a, 22b, 22c are formed so as to project outward in the radial direction of the lens-side mount ring 22.

The configuration of the image pickup apparatus 1 is as described above. It should be noted that, because the configuration is not directly related to the present invention, the other configuration, which is not described, is substantially the same as the configuration of the conventional imaging device.

In the mount structure of the present embodiment, the body side mount ring 12 and the lens side mount ring 22 are bayonet-coupled. 4 to 9 are views showing a state in which the main body side mount ring and the lens side mount ring are bayonet-coupled in the mount structure of the present embodiment. Of these, FIG. 4 is an enlarged perspective view of a main part of the mount structure in a coupled state. FIG. 5 is a plan view of the mount structure in a coupled state. FIG. 6 is an enlarged cross-sectional view of the main part taken along the line [6]-[6] of FIG. FIG. 7 is an enlarged cross-sectional view of the main part taken along the line [7]-[7] of FIG. FIG. 8 is an enlarged cross-sectional view of a main part taken along the line [8]-[8] of FIG. FIG. 9 is a plan view particularly explaining the arrangement configuration of the first receiving portion in the mount structure of the present embodiment.

When the main body side mount ring 12 (the main body side bayonet claw thereof) and the lens side mount ring 22 (the lens side bayonet claw) are bayonet-coupled, for example, as shown in FIG. 4, the main body side bayonet claw 12c is It is arranged so as to face the lens side bayonet claw 22c in the direction along the optical axis O. At this time, the first receiving portion 12xc of the main body side bayonet claw 12c comes into contact with and supports the lens side bayonet claw 22c.

Similarly, as shown in FIG. 6, the main body side bayonet claw 12a is arranged so as to face the lens side bayonet claw 22a in the direction along the optical axis O. At this time, the first receiving portion 12xa of the main body side bayonet claw 12a comes into contact with and supports the lens side bayonet claw 22a.

Further, at this time, the second receiving portion 12y of the main body side bayonet claw 12c is opposed to the lens side bayonet claw 22c with a predetermined distance D as shown in FIGS. Are arranged. That is, at this time, the second receiving portion 12y and the lens side bayonet claw 22c (both) are not in contact with each other.

Here, as described above, the second receiving portion 12y is a portion having relatively weak strength as compared with the portion where the first receiving portions (12xa, 12xb, 12xc, 12xd) are provided.

Normally, in this state (the state where the body side mount ring 12 and the lens side mount ring 22 are bayonet-coupled), the lens barrel 20 is moved by the first receiving portion (12xa, 12xb, 12xc, 12xd). , The optical axis O is supported so as not to tilt.

However, in the same state, an unintended large amount of force, for example, in the direction of tilting the optical axis O may be given to the lens barrel 20. In this case, the lens barrel 20 may tilt slightly.

Even in such a case, in the mount structure of the present embodiment, since the predetermined distance D is provided between both the second receiving portion 12y and the lens side bayonet claw 22c, the second receiving portion 12y and the lens side mount are mounted. The ring 22 (the lens side bayonet claw thereof) does not come into contact with the ring 22. Therefore, with this configuration, the weight load of the lens barrel 20 is not applied to the second receiving portion 12y, and therefore, a relatively weak strength portion of the main body side bayonet claw (the main body near the second receiving portion 12y). The deformation of the side bayonet claw) can be suppressed.

As described above, according to the above-described embodiment, the three main body side bayonet claws 12a, 12b, 12c are formed along the edge of the opening 12d, and the back surfaces of the three main body side bayonet claws 12a, 12b, 12c are formed. The main body side mount ring 12 and the main body side mount ring 12 on which the first receiving portions (12xa, 12xb, 12xc, 12xd) for receiving the lens side (accessory side) bayonet claws 22a, 22b, 22c are formed. A body main body 11 provided with a screw portion for fixing the screw, and the screw portion forms a first virtual quadrangle A at four locations outside the opening 11a, and the first receiving portion of the main body side mount ring 12 ( 12xa, 12xb, 12xc, 12xd) are formed on at least one of the main body side bayonet claws 12a, 12b, 12c, and are formed at four places forming the second virtual quadrangle B as a whole, and the main body side bayonet claws 12a, 12b. , 12c are bayonet-coupled with the lens-side bayonet claws 22a, 22b, 22c, the second virtual quadrangle B is located inside the first virtual quadrangle A.

Accordingly, when the main body side bayonet claws 12a, 12b, 12c are bayonet-coupled with the lens side bayonet claws 22a, 22b, 22c, the lens barrel 20 can be supported at a stronger portion.

Further, when the body side bayonet claws 12a, 12b, 12c are bayonet-coupled with the lens side bayonet claws 22a, 22b, 22c, the lens side bayonet claw 22a is provided outside the body side bayonet claws 12a, 12b, 12c and the first virtual square A. , 22b, 22c face each other and a second receiving portion 12y is formed. When the main body side bayonet claws 12a, 12b, 12c are coupled with the lens side bayonet claws 22a, 22b, 22c, the second receiving part 12y is formed. The portion 12y and the lens-side bayonet claws 22a, 22b, 22c are configured to be separated by a predetermined distance D.

Therefore, by this, when the main body side bayonet claw and the lens side bayonet claw are bayonet-coupled, an unintended large amount of force in the direction of tilting the optical axis O is imparted to the lens barrel 20, Even if the lens barrel 20 may be slightly inclined, the predetermined distance D between the second receiving portion 12y and the lens-side bayonet claw 22c allows the second receiving portion 12y and the second receiving portion 12y to be separated from each other. It is possible to avoid contact with (the lens side bayonet claw of) the lens side mount ring 22. Therefore, it is possible to suppress the deformation of a portion of the main body side bayonet claw having a relatively weak strength (specifically, for example, the main body side bayonet claw near the second receiving portion 12y).

In addition, in the description of the above-described embodiment, the image pickup apparatus 1 is illustrated as an example of the electronic apparatus to which the bayonet coupling type mounting structure is applied. Specifically, the mount structure of the present embodiment exemplifies a case where the lens barrel 20 is attached to the front surface of the body 11 of the image pickup apparatus body 10 in the image pickup apparatus 1 by bayonet coupling.

In this case, in addition to the lens barrel 20 described in detail above, accessory devices such as a rear converter and a close-up ring are provided on the front surface of the body 11 of the imaging device body 10 in the imaging device 1. You can also wear it. Therefore, the mount ring on the accessory device side such as the rear converter and the close-up ring in this case can be similarly handled by using the same form as the mount ring 22 of the lens barrel 20 described above.

Further, the rear converter, the close-up ring, and the like as these accessory devices are configured to be connected to their front side by a mount structure for connecting a normal lens barrel to a bayonet. Also in this case, if the mount ring on the front surface of the accessory device such as the rear converter or the close-up ring is configured in the same manner as the mount structure of the present invention, the same effect as in the above-described embodiment can be obtained.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications and applications can be implemented without departing from the gist of the invention. Furthermore, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the above-mentioned one embodiment, if the problem to be solved by the invention can be solved and the effect of the invention can be obtained, this constituent element is deleted. The configured configuration can be extracted as an invention. Furthermore, the constituent elements of different embodiments may be combined appropriately. This invention is not limited by its specific embodiments, except as limited by the appended claims.

1 Imaging device 10... Imaging device main body 11... Body main body 11a... Opening 12... Main body side mount rings 12a, 12b, 12c... Main body side bayonet claw 12d... Openings 12ha, 12hb, 12hc, 12hd. Screw holes 12xa, 12xb, 12xc, 12xd... First receiving portion 12y... Second receiving portion 13a, 13b, 13c, 13d... Fixing screw 14... Image sensor 15... Lock release button 16... Shutter release Button 17... Operating member 18... Grip 20... Lens barrel 21... Lens barrel main body 21a... Opening 22... Lens side mount rings 22a, 22b, 22c... Lens side bayonet claw 23... Fixed Screw 24... Imaging optical system 112... Main body side mount members 112a, 112b, 112c... Main body side bayonet claw 112d... Openings 112ha, 112hb, 112hc, 112hd... Screw holes 112xa, 112xb, 112xc. 122... Lens-side mount members 122a, 122b, 122c... Lens-side bayonet claw A... First virtual square B... Second virtual square D... Predetermined distance O... Optical axis

Claims (6)

A mount ring having three main body side bayonet claws formed along the edge of the opening, and a first receiving portion for receiving an accessory side bayonet claw formed on each back surface side of the three main body side bayonet claws. ,
A main body that is provided with a screw portion for fixing the mount ring with a screw, and the screw portion forms a first virtual quadrangle at four locations outside the opening;
Equipped with,
At least one of the first receiving portion is formed on each of the main body side bayonet claws, and is formed at four places forming a second virtual quadrangle as a whole,
The mount structure for bayonet coupling, wherein the second virtual quadrangle is located inside the first virtual quadrangle when the main body side bayonet claw is bayonet coupled to the accessory side bayonet claw. The positions of the four screw portions forming the first virtual quadrangle are the first and second screwing positions sandwiching the predetermined body side bayonet claw, and the opening edge facing the predetermined body side bayonet claw. 3. The mount structure for bayonet coupling according to claim 1, wherein the mount positions are third and fourth screw fastening positions which are on the side of the body and do not sandwich any of the body side bayonet claws. When the main body side bayonet claw is bayonet-coupled with the accessory side bayonet claw, a predetermined one of the main body side bayonet claw and a predetermined one of the accessory side bayonet claws are provided outside the first virtual square. The second receiving portion is formed at the opposite position,
2. The mount structure for bayonet coupling according to claim 1, wherein, when the bayonet coupling is performed, the second receiving portion and a predetermined one of the accessory side bayonet claws are separated by a predetermined distance. The predetermined distance is a backlash generated between the main body side bayonet claw and the accessory side bayonet claw when the main body side bayonet claw and the accessory side bayonet claw are bayonet-coupled. Item 3. A mount structure for bayonet coupling according to item 3. 2. The mount structure for bayonet coupling according to claim 1, wherein the first receiving portion is formed with a protrusion that comes into contact with the accessory-side bayonet claw when receiving the accessory-side bayonet claw. The mount structure for bayonet coupling according to claim 1, wherein the accessory is a lens barrel.

Images