JP2015060042A

JP2015060042A - Fastening structure of conductive material member

Info

Publication number: JP2015060042A
Application number: JP2013193069A
Authority: JP
Inventors: 悠司小暮; Yuji Kogure; 小林　孝裕; Takahiro Kobayashi; 孝裕小林
Original assignee: Ricoh Imaging Co Ltd
Current assignee: Ricoh Imaging Co Ltd
Priority date: 2013-09-18
Filing date: 2013-09-18
Publication date: 2015-03-30
Anticipated expiration: 2033-09-18
Also published as: JP6286967B2

Abstract

PROBLEM TO BE SOLVED: To provide a fastening structure capable of electrically conducting plural conductive material members by using a general-purpose fastening component without a step for removing an insulation film on a surface of the conductive material member.SOLUTION: A fastening structure has a structure in which a first stationary cylinder 1 and a second stationary cylinder 2 (conductive material member) whose surfaces have an insulation film A respectively and which have a fastening hole 1b and a fastening hole 2b respectively, and a conductive screw S1 (fastening member) is inserted into the fastening holes. The inserted screw S1 is electrically conducted to the first stationary cylinder 1 and the second stationary cylinder 2 at portions where insulation films A of inner surfaces of the fastening holes 1b, 2b are removed. The first stationary cylinder 1 and the second stationary cylinder 2 are fastened by the screw S1, and mutually electrically conducted via the screw S1.

Description

本発明は表面に絶縁膜を有する導電材料部材を他の導電材料部材に対して電気導通した状態で締結する構造に関するものである。 The present invention relates to a structure in which a conductive material member having an insulating film on its surface is fastened in a state of being electrically conducted to another conductive material member.

カメラあるいはカメラ用レンズは、金属材料等の導電材料部材を互いに締結して筐体やレンズ筒を構成しているが、この際にボルトやビス（小ネジ）を用いて締結する構造が用いられる。アルミニウムを用いる場合では表面処理の一つとしてアルマイト膜を形成しているが、このアルマイト膜は絶縁膜であるので、締結する際には締結箇所の絶縁膜を部分的に除去する必要があり、作業工程が煩雑なものになるという問題がある。このような絶縁膜による相互の電気導通を容易に行うための技術として特許文献１，２を用いることが考えられる。 The camera or the camera lens is composed of a casing or a lens tube by fastening conductive material members such as metal materials to each other. At this time, a structure that is fastened by using bolts or screws (small screws) is used. . In the case of using aluminum, an alumite film is formed as one of the surface treatments, but since this alumite film is an insulating film, it is necessary to partially remove the insulating film at the fastening portion when fastening, There is a problem that the work process becomes complicated. It is conceivable to use Patent Documents 1 and 2 as a technique for facilitating mutual electrical conduction by such an insulating film.

特許文献１は、絶縁膜を有する導電材料部材をボルトとナットとで締結する構成において、ボルトの頭部やナットの座面に突起を設け、ボルトとナットを締結したときにこれらの突起を導電材料部材の表面に食い込ませ、表面の絶縁膜を突き破って導電基材に達するように構成することによって、ボルトおよびナットを介して両導電材料部材の電気導通を実現している。特許文献２は、絶縁膜を有する導電基材に導電材料部材をネジにより締結する構成において、導電基材の絶縁膜にネジが挿通可能な穴を開口しておき、ネジをこの開口を通して導電基材にまで進入させることによって導電材料部材をネジを介して導電基材に電気導通させている。 In Patent Document 1, in a configuration in which a conductive material member having an insulating film is fastened by a bolt and a nut, a protrusion is provided on the head of the bolt or a seating surface of the nut, and when the bolt and the nut are fastened, the protrusion is electrically conductive. Electric conduction between both the conductive material members is realized through bolts and nuts by cutting into the surface of the material member and breaking through the insulating film on the surface to reach the conductive base material. In Patent Document 2, in a configuration in which a conductive material member is fastened to a conductive base material having an insulating film with a screw, a hole through which the screw can be inserted is opened in the insulating film of the conductive base material, and the screw is connected to the conductive base through the opening. The conductive material member is electrically connected to the conductive base material through the screw by entering the material.

特許第３９７８５２６号公報Japanese Patent No. 3978526 特開２００５−５１１２９号公報Japanese Patent Laying-Open No. 2005-51129

特許文献１の技術は、ボルトやナットに設けた突起が導電材料部材に食い込む箇所において電気導通する構成であるので、導電材料に対する電気導通箇所が点状ないし線状であり接触面積は小さく、接触電気抵抗を小さくすることは難しい。また、この技術では、ボルトとナットの座面に当接される導電材料部材に対して電気導通は可能であるが、複数の導電材料部材を締結方向に重ねた場合には、突起と接触する部材しか電気導通を行うことはできない。さらに、この技術は、汎用のボルトやナットが利用できず、突起を有する特殊なボルトやナットが必要とされるので部品等のコスト高の要因になる。 Since the technique of Patent Document 1 is a structure in which the protrusions provided on the bolts and nuts are electrically connected to the conductive material member, the electrically conductive points with respect to the conductive material are dotted or linear, the contact area is small, and the contact is small. It is difficult to reduce the electrical resistance. Further, in this technique, electrical conduction is possible with respect to the conductive material member abutting against the seating surfaces of the bolt and nut, but when a plurality of conductive material members are stacked in the fastening direction, they contact with the protrusions. Only members can conduct electricity. In addition, this technique cannot use general-purpose bolts and nuts, and requires special bolts and nuts having protrusions, which increases the cost of components and the like.

特許文献２の技術はネジが螺合される箇所に予めネジ穴を開口し、かつ当該ネジ穴の内面の絶縁膜を除去しておく必要がある。そのため、先にネジ穴を開口した上で表面に絶縁膜を形成する導電材料部材の場合、例えば通常のアルミニウム部品で採用されているように、ネジ穴を開口した後に表面にアルマイト膜を形成する導電材料部材には適用することができない。強いてこの種のアルミニウム部品に適用する際には、改めてアルマイト膜を部分的に除去する工程が必要となり、結果として前記した従来の問題を解消することはできない。 In the technique of Patent Document 2, it is necessary to open a screw hole in advance at a place where the screw is screwed and to remove the insulating film on the inner surface of the screw hole. Therefore, in the case of a conductive material member that first forms a screw hole and then forms an insulating film on the surface, an alumite film is formed on the surface after the screw hole is opened, for example, as used in ordinary aluminum parts. It cannot be applied to conductive material members. When applying to this kind of aluminum parts, a process of partially removing the alumite film is required again, and as a result, the conventional problems described above cannot be solved.

本発明の目的は、導電材料部材の締結孔の内面の絶縁膜を除去する工程を行うことなく、しかも一般に提供されている汎用の締結部品を用いることにより複数の導電材料部材を電気導通させることが可能な締結構造を提供するものである。 An object of the present invention is to electrically conduct a plurality of conductive material members by using a general-purpose fastening component that is generally provided without performing a step of removing the insulating film on the inner surface of the fastening hole of the conductive material member. The present invention provides a fastening structure that can be used.

本発明は、表面に絶縁膜が存在する複数の導電材料部材が積層され、これら導電材料部材に開口された締結孔内に導電性の締結部材が内挿されている構成を含む締結構造であって、内挿された締結部材は締結孔の内面の絶縁膜が除去された箇所において導電材料部材に電気導通されていることを特徴とする。特に本発明は、複数の導電材料部材は当該締結部材により締結されるとともに、当該締結部材を介して電気導通されていることを特徴としている。 The present invention is a fastening structure including a configuration in which a plurality of conductive material members having an insulating film on the surface are laminated, and a conductive fastening member is inserted into a fastening hole opened in the conductive material member. The inserted fastening member is electrically connected to the conductive material member at a location where the insulating film on the inner surface of the fastening hole is removed. In particular, the present invention is characterized in that the plurality of conductive material members are fastened by the fastening member and are electrically connected through the fastening member.

例えば、本発明の好ましい形態は、締結孔は円形の孔であり、締結部材は締結孔の内径よりも外径の大きなネジで形成され、導電材料部材と締結部材の電気導通箇所は当該ネジを内挿したときにセルフタッピングにより絶縁膜が除去された箇所である。この形態においては、締結孔はネジを内挿する側の内面の一部に当該ネジに螺合可能なネジ部が形成されることが好ましい。 For example, in a preferred embodiment of the present invention, the fastening hole is a circular hole, the fastening member is formed by a screw having an outer diameter larger than the inner diameter of the fastening hole, and the electrically conductive portion of the conductive material member and the fastening member is the screw. This is where the insulating film is removed by self-tapping when interpolated. In this embodiment, the fastening hole is preferably formed with a screw portion that can be screwed into the screw on a part of the inner surface on the side where the screw is inserted.

本発明の他の好ましい形態は、締結部材は締結孔の開口形状とは異なる断面形状の圧入部材で形成され、導電材料部材と締結部材の電気導通箇所は当該圧入部材を圧入したときに衝接により絶縁膜が除去された箇所である。この形態においては、圧入部材は周面の少なくとも一部に外径方向に突出した角部を有し、当該角部が締結孔の内面の絶縁膜に衝接される構成とする。例えば、締結孔は円形の孔であり、圧入部材は三角柱、四角柱を含む角柱あるいはスプライン構造体である。 In another preferred embodiment of the present invention, the fastening member is formed by a press-fitting member having a cross-sectional shape different from the opening shape of the fastening hole, and the electrically conductive portion of the conductive material member and the fastening member is abutted when the press-fitting member is pressed. This is where the insulating film is removed. In this embodiment, the press-fitting member has a corner portion protruding in the outer diameter direction on at least a part of the peripheral surface, and the corner portion is in contact with the insulating film on the inner surface of the fastening hole. For example, the fastening hole is a circular hole, and the press-fitting member is a triangular column, a rectangular column including a quadrangular column, or a spline structure.

本発明によれば、締結孔に締結部材としてのネジを螺入すれば、ネジにより締結孔の内面がセルフタッピングされ、その際に締結孔の内面の絶縁膜が破壊されて締結孔の内面から除去される。これと同時にネジのネジ部が導電材料部材に直接接触する状態となり、相互に電気導通される。また、本発明によれば締結孔に締結部材としての圧入部材を圧入すれば、圧入部材に衝接される締結孔の内面の絶縁膜が破壊されて締結孔の内面から除去される。これと同時に圧入部材の衝接した箇所が導電材料部材に直接接触する状態となり、相互に電気導通される。これにより、既存のネジや圧入部材を用いるだけで、しかも絶縁膜を除去するための工程を行わなくても導電材料部材と締結部材との電気導通が可能になり、当該締結部材を介して締結する他の導電材料部材との電気導通も可能になる。 According to the present invention, when a screw as a fastening member is screwed into the fastening hole, the inner surface of the fastening hole is self-tapped by the screw, and at this time, the insulating film on the inner surface of the fastening hole is destroyed and the inner surface of the fastening hole is removed. Removed. At the same time, the screw portion of the screw comes into direct contact with the conductive material member, and is electrically connected to each other. Further, according to the present invention, when a press-fitting member as a fastening member is press-fitted into the fastening hole, the insulating film on the inner surface of the fastening hole brought into contact with the press-fitting member is broken and removed from the inner surface of the fastening hole. At the same time, the contacted portions of the press-fitting members are in direct contact with the conductive material member and are electrically connected to each other. As a result, the conductive material member and the fastening member can be electrically connected to each other only by using existing screws and press-fitting members and without performing a process for removing the insulating film, and fastening is performed via the fastening member. Thus, electrical conduction with other conductive material members is also possible.

本発明をカメラのレンズ鏡筒に適用した実施形態１の要部の断面図。Sectional drawing of the principal part of Embodiment 1 which applied this invention to the lens-barrel of the camera. 図１の要部の概略構成を示す部分分解斜視図。The partial exploded perspective view which shows schematic structure of the principal part of FIG. 実施形態１の第１ネジの締結構造の断面図。Sectional drawing of the fastening structure of the 1st screw | thread of Embodiment 1. FIG. 実施形態１の変形例における第２ネジの締結構造の断面図。Sectional drawing of the fastening structure of the 2nd screw in the modification of Embodiment 1. FIG. 実施形態２の締結構造の断面図。Sectional drawing of the fastening structure of Embodiment 2. FIG. 実施形態１，２における締結孔の変形例の断面図。Sectional drawing of the modification of the fastening hole in Embodiment 1,2. 実施形態３の概略構成の斜視図。FIG. 6 is a perspective view of a schematic configuration of a third embodiment. 実施形態３の圧入方向に垂直な方向の断面図とそのｂ−ｂ線断面図。Sectional drawing of the direction perpendicular | vertical to the press injection direction of Embodiment 3, and its bb sectional view taken on the line. 実施形態３の圧入部材の変形例の斜視図。The perspective view of the modification of the press-fitting member of Embodiment 3. FIG.

（実施形態１）
次に、本発明の実施の形態について図面を参照して説明する。図１は本発明を適用したカメラのレンズ鏡筒の実施形態の断面図であり、レンズ光軸Ｌｘを挟む上下部位はほぼ対称の構造であるのでレンズ光軸の上側の部位のみを図示している。このレンズ鏡筒は後端部（撮影者側、図１の右側）に図には表れないカメラボディに対してレンズを着脱可能とするためのレンズマウント３を備えており、このレンズマウント３の前側（被写体側）に第１固定筒１、第２固定筒２が順次締結されている。前記第２固定筒２の内周にはフォーカスリング４がレンズ光軸回りに回転可能に支持されており、このフォーカスリング４の内周にはレンズ体Ｌを支持したレンズ枠５が直進ヘリコイド構造によって支持されている。これにより、フォーカスリング４を回転操作することによりレンズ枠５はレンズ光軸Ｌｘに沿って前後に移動され、フォーカシング（焦点合わせ）が行われる。前記レンズ枠５の前面には前カバー６が取着されてレンズ鏡筒の前側領域を覆い隠している。また、前記レンズマウント３の内面には後カバー７が取着されて当該レンズ鏡筒の後側領域を覆い隠している。さらに、前記第１固定筒１の内径側の領域の前面で前記第２固定筒２に周囲を囲まれている領域には電子回路を構築する回路基板８が支持されている。 (Embodiment 1)
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an embodiment of a lens barrel of a camera to which the present invention is applied. Since the upper and lower parts sandwiching the lens optical axis Lx are substantially symmetrical, only the upper part of the lens optical axis is shown. Yes. This lens barrel is provided with a lens mount 3 at the rear end (photographer side, right side of FIG. 1) for making the lens detachable with respect to a camera body that does not appear in the drawing. A first fixed cylinder 1 and a second fixed cylinder 2 are sequentially fastened to the front side (subject side). A focus ring 4 is supported on the inner circumference of the second fixed cylinder 2 so as to be rotatable around the optical axis of the lens, and a lens frame 5 supporting a lens body L is arranged on the inner circumference of the focus ring 4 in a rectilinear helicoid structure. Is supported by. Thereby, by rotating the focus ring 4, the lens frame 5 is moved back and forth along the lens optical axis Lx, and focusing (focusing) is performed. A front cover 6 is attached to the front surface of the lens frame 5 to cover and hide the front region of the lens barrel. A rear cover 7 is attached to the inner surface of the lens mount 3 to cover and hide the rear region of the lens barrel. Furthermore, a circuit board 8 for constructing an electronic circuit is supported in a region surrounded by the second fixed tube 2 on the front surface of the inner diameter side region of the first fixed tube 1.

このレンズ鏡筒では、撮影者に帯電され、あるいは外部物体に生じる静電気から回路基板８、すなわち電子回路に対するＥＭＩ（電磁妨害）を図るために、電子回路８の周囲を覆う第１固定筒１および第２固定筒２を相互に電気導通させ、さらに第１固定筒１をレンズマウント３に電気導通させる構成がとられている。この構成をとることにより、第２固定筒２に撮影者の静電気が帯電しても、当該静電気を第２固定筒２から第１固定筒１に移動させ、さらにレンズマウント３に移動させてこのレンズマウント３から放電させることができ、電子回路８での静電破壊を防止することができる。また、静電気をレンズマウント３からカメラボディにまで移動させる。カメラボディはレンズ鏡筒に比較して電荷の蓄積量が多いので、レンズ鏡筒から効果的に静電気を放電させることができる。第１固定筒１に静電気が帯電した場合でも同様であり、レンズマウント３を介してカメラ側に移動させ、あるいはレンズマウント３から放電させる。この電気導通を図るために、実施形態１では、第１固定筒１と第２固定筒２を導電性の第１ネジＳ１により締結し、第１固定筒１とレンズマウント３を後述するように導電スポンジ９により電気導通している。 In this lens barrel, the first fixed cylinder 1 covering the periphery of the electronic circuit 8 and the EMI (electromagnetic interference) to the circuit board 8, that is, the electronic circuit, from static electricity charged by the photographer or generated in an external object, and The second fixed cylinder 2 is electrically connected to each other, and the first fixed cylinder 1 is electrically connected to the lens mount 3. By adopting this configuration, even if the photographer's static electricity is charged in the second fixed cylinder 2, the static electricity is moved from the second fixed cylinder 2 to the first fixed cylinder 1 and further moved to the lens mount 3. The lens mount 3 can be discharged, and electrostatic breakdown in the electronic circuit 8 can be prevented. Further, the static electricity is moved from the lens mount 3 to the camera body. Since the camera body has a larger amount of charge accumulation than the lens barrel, static electricity can be effectively discharged from the lens barrel. The same applies to the case where static electricity is charged in the first fixed cylinder 1 and is moved to the camera side through the lens mount 3 or discharged from the lens mount 3. In order to achieve this electrical continuity, in the first embodiment, the first fixed cylinder 1 and the second fixed cylinder 2 are fastened by a conductive first screw S1, and the first fixed cylinder 1 and the lens mount 3 are described later. The conductive sponge 9 is electrically connected.

図２は前記第１固定筒１、第２固定筒２、レンズマウント３の締結状態を模式的に示す概念図である。第１固定筒１と第２固定筒２は廉価で軽く、かつ加工性が良いアルミニウムを基材とし、その表面をアルマイト処理して絶縁膜であるアルマイト膜（後述する）が形成されている。第１固定筒１は外径縁部が幾分レンズ光軸方向に幅寸法を有し、ここから内径方向に向けて突出した円環板状部１ａを有している。第２固定筒２は概ね円環状に形成され、その後端に設けられて内径方向に突出された内フランジ２ａを有している。そして、第２固定筒２の内フランジ２ａの後面が第１固定筒１の円環板状部１ａの前面で前記電子回路８を囲む円周領域に当接され、この当接された領域の円周４箇所においてそれぞれレンズ光軸方向に挿通される第１ネジＳ１により両者は締結されている。 FIG. 2 is a conceptual diagram schematically showing a fastening state of the first fixed cylinder 1, the second fixed cylinder 2, and the lens mount 3. The first fixed cylinder 1 and the second fixed cylinder 2 are made of aluminum, which is inexpensive, light and easy to process, and an alumite film (described later) which is an insulating film is formed by anodizing the surface. The first fixed cylinder 1 has an annular plate-like portion 1a whose outer diameter edge portion has a width dimension somewhat in the optical axis direction of the lens and protrudes from here toward the inner diameter direction. The second fixed cylinder 2 is formed in a generally annular shape, and has an inner flange 2a provided at the rear end thereof and protruding in the inner diameter direction. The rear surface of the inner flange 2a of the second fixed cylinder 2 is brought into contact with the circumferential area surrounding the electronic circuit 8 on the front surface of the annular plate-like portion 1a of the first fixed cylinder 1, and Both of them are fastened by first screws S1 inserted in the lens optical axis direction at four locations around the circumference.

さらに、図２において、前記レンズマウント３は表面がメッキされて電気導通可能な真鍮で構成されており、後面に周知のバヨネット片３ａを有する円環板状に形成されており、前面が前記第１固定筒１の円環板状部１ａの後面に当接され、この当接領域内の前記第１ネジＳ１とは異なる円周４箇所においてそれぞれレンズ光軸方向に挿通される第２ネジＳ２により両者は締結されている。第１ネジＳ１はステンレスや鉄等のアルミニウムよりも硬度の高い導電材で形成されており、しかもネジ形状（ネジ軸方向の断面形状）はネジ山Ｓａの先端が尖った形状となるように形成されている。さらに、このネジ山Ｓａの高さ、すなわちネジ谷からの高さは、少なくとも前記第１と第２の各固定筒１，２の表面に形成されているアルマイト膜の膜厚よりも高く形成されている。第１と第２のネジＳ１，Ｓ２は既に広く提供されているものをそのまま利用することが可能である。 Further, in FIG. 2, the lens mount 3 is made of brass whose surface is plated and electrically conductive, is formed in a circular plate shape having a known bayonet piece 3a on the rear surface, and the front surface is the first plate. A second screw S2 which is brought into contact with the rear surface of the annular plate-like portion 1a of the fixed cylinder 1 and is inserted in the lens optical axis direction at four positions different from the first screw S1 in the contact region. Both are concluded. The first screw S1 is formed of a conductive material having a hardness higher than that of aluminum such as stainless steel or iron, and the screw shape (cross-sectional shape in the screw axis direction) is formed such that the tip of the thread Sa is pointed. Has been. Further, the height of the thread Sa, that is, the height from the thread valley is formed at least higher than the thickness of the alumite film formed on the surfaces of the first and second fixed cylinders 1 and 2. ing. As the first and second screws S1 and S2, those that have already been widely provided can be used as they are.

図３は第１ネジＳ１の軸線方向に沿った前記第１固定筒１と第２固定筒２の締結箇所の断面図であり、（ａ）は第１ネジＳ１で締結する前の状態を示し、（ｂ）は締結した状態を示している。第１固定筒１と第２固定筒２には前記第１ネジＳ１を挿通させる箇所にレンズ光軸方向の締結孔１ｂ，２ｂがそれぞれ開口されている。第１固定筒１と第２固定筒２では、これらの締結孔１ｂ，２ｂを開口した後に前記したアルマイト処理を行なうことが慣行とされているので、第１固定筒１と第２固定筒２の全表面、すなわち各締結孔１ｂ，２ｂの内面にも絶縁膜であるアルマイト膜Ａが形成されている。そのため、第２固定筒２の後面と第１固定筒１の前面を当接しても両者はアルマイト膜Ａによって互いに絶縁された状態にある。ここで、前記第１固定筒１と第２固定筒２の各締結孔１ｂ，２ｂの内径は第１ネジＳ１のネジ山Ｓａの外径よりも小径に形成された単純な円筒周面を有する孔として形成されている。そして、第１ネジＳ１を第１固定筒１の後面側から両締結孔１ｂ，２ｂを通して螺合させて第１固定筒１と第２固定筒２を締結しているが、第１ネジＳ１を両締結孔１ｂ，２ｂに螺入させるのに伴って第１ネジＳ１はネジ山Ｓａによって各締結孔１ｂ，２ｂの内面をタッピング（ネジ切削）しながら螺入（セルフタッピング）される。 FIG. 3 is a cross-sectional view of a fastening portion of the first fixed cylinder 1 and the second fixed cylinder 2 along the axial direction of the first screw S1, and (a) shows a state before being fastened with the first screw S1. , (B) shows the fastened state. In the first fixed cylinder 1 and the second fixed cylinder 2, fastening holes 1b and 2b in the lens optical axis direction are opened at positions where the first screw S1 is inserted. In the first fixed cylinder 1 and the second fixed cylinder 2, since it is customary to perform the alumite treatment after opening these fastening holes 1b, 2b, the first fixed cylinder 1 and the second fixed cylinder 2 are used. An alumite film A, which is an insulating film, is also formed on the entire surface, that is, the inner surfaces of the fastening holes 1b and 2b. Therefore, even if the rear surface of the second fixed cylinder 2 and the front surface of the first fixed cylinder 1 are in contact with each other, they are in a state of being insulated from each other by the alumite film A. Here, the inner diameter of each fastening hole 1b, 2b of the first fixed cylinder 1 and the second fixed cylinder 2 has a simple cylindrical peripheral surface formed smaller than the outer diameter of the thread Sa of the first screw S1. It is formed as a hole. The first screw S1 is screwed through the fastening holes 1b, 2b from the rear surface side of the first fixed cylinder 1 to fasten the first fixed cylinder 1 and the second fixed cylinder 2, but the first screw S1 is The first screw S1 is screwed (self-tapping) while tapping (screw cutting) the inner surface of each fastening hole 1b, 2b by the screw thread Sa as being screwed into both the fastening holes 1b, 2b.

このように締結孔１ｂ，２ｂに第１ネジＳ１を螺合したときに、第１ネジＳ１のネジ山Ｓａが各締結孔１ｂ，２ｂの内周面をタッピングすることにより、各締結孔１ｂ，２ｂの内面のアルマイト膜Ａは破壊され、タッピングされたネジ溝は各筒１，２の基材であるアルミニウムにまで到達する。これにより、各締結孔１ｂ，２ｂの内周面では、第１固定筒１と第２固定筒２のアルミニウムが第１ネジＳ１のネジ部に直接接触される状態となり、それぞれ電気導通される。したがって、第１固定筒１と第２固定筒２は第１ネジＳ１を介して相互に電気導通されることになる。 When the first screw S1 is screwed into the fastening holes 1b and 2b in this way, the thread Sa of the first screw S1 taps the inner peripheral surface of each fastening hole 1b and 2b, so that each fastening hole 1b, The alumite film A on the inner surface of 2b is broken, and the tapped thread groove reaches the aluminum which is the base material of each of the cylinders 1 and 2. Thereby, in the inner peripheral surface of each fastening hole 1b, 2b, the aluminum of the 1st fixed cylinder 1 and the 2nd fixed cylinder 2 will be in the state directly contacted with the thread part of 1st screw S1, and each will be electrically connected. Therefore, the first fixed cylinder 1 and the second fixed cylinder 2 are electrically connected to each other via the first screw S1.

なお、この実施形態では、第２ネジＳ２によるレンズマウント３と第１固定筒１との締結には、本発明は適用しておらず、それぞれのネジ穴は従来と同様に予めネジ穴の内面にネジ溝を形成し、第１固定筒１では当該ネジ穴の内面にアルマイト膜を形成している。そして、これらのネジ穴に第２ネジＳ２を螺合してレンズマウント３と第１固定筒１とを締結している。そして、第１固定筒１とレンズマウント３とを電気導通するために、第１固定筒１の円環板部１ａの後面に矩形の凹部を形成して当該凹部の内面のアルマイト膜を除去し、その上でこの凹部内に直方体をした導電スポンジ９を嵌入している。第１固定筒１とレンズマウント３を第２ネジＳ２で締結したときに、この導電スポンジ９をレンズマウント３の前面に当接することで両者の電気導通を行っている。この場合、凹部の表面のアルマイト膜を除去する作業は必要であるが、ネジ穴の内面のアルマイト膜を除去するよりも容易である。なお、このような導電スポンジ９を用いる場合には、図示は省略するが、第１ネジＳ１を配設している箇所の第１固定筒１の後面に設けられている凹部１ｄ（図１，２参照）に導電スポンジを嵌入してレンズマウント３との電気導通を図るようにしてもよい。この場合には、導電スポンジは第１ネジＳ１の頭部に電気導通するので、凹部１ｄの内面のアルマイト膜を除去する必要はない。 In this embodiment, the present invention is not applied to the fastening of the lens mount 3 and the first fixed cylinder 1 by the second screw S2, and each screw hole is previously provided in the inner surface of the screw hole in the same manner as in the prior art. In the first fixed cylinder 1, an alumite film is formed on the inner surface of the screw hole. Then, the lens mount 3 and the first fixed cylinder 1 are fastened by screwing the second screw S2 into these screw holes. In order to electrically connect the first fixed cylinder 1 and the lens mount 3, a rectangular concave portion is formed on the rear surface of the annular plate portion 1a of the first fixed cylinder 1, and the alumite film on the inner surface of the concave portion is removed. The conductive sponge 9 having a rectangular parallelepiped shape is inserted into the recess. When the first fixed cylinder 1 and the lens mount 3 are fastened by the second screw S2, the conductive sponge 9 is brought into contact with the front surface of the lens mount 3 so that the two are electrically connected. In this case, an operation of removing the alumite film on the surface of the recess is necessary, but it is easier than removing the alumite film on the inner surface of the screw hole. When such a conductive sponge 9 is used, although not shown, a recess 1d (FIG. 1, FIG. 1) provided on the rear surface of the first fixed cylinder 1 where the first screw S1 is disposed. 2), a conductive sponge may be inserted into the lens mount 3 for electrical conduction. In this case, since the conductive sponge is electrically connected to the head of the first screw S1, it is not necessary to remove the alumite film on the inner surface of the recess 1d.

この構成の図１のレンズ鏡筒では、第２固定筒２と第１固定筒１は第１ネジＳ１を介して電気導通される。また、第１固定筒１とレンズマウント３は導電スポンジ９を介して電気導通される。なお、後面カバー７は樹脂製であるので電気導通されることはない。したがって、撮影者等からの静電気が第２固定筒２あるいは第１固定筒１に帯電されても、この静電気は第１固定筒１からレンズマウント３にまで移動され、ここから放電される。あるいは、レンズ鏡筒がカメラに装着されているときにはレンズマウント３からカメラ本体側に放電されることになる。 In the lens barrel of FIG. 1 having this configuration, the second fixed cylinder 2 and the first fixed cylinder 1 are electrically connected via the first screw S1. The first fixed cylinder 1 and the lens mount 3 are electrically connected via a conductive sponge 9. Since the rear cover 7 is made of resin, it is not electrically connected. Therefore, even if static electricity from a photographer or the like is charged in the second fixed cylinder 2 or the first fixed cylinder 1, the static electricity is moved from the first fixed cylinder 1 to the lens mount 3 and discharged therefrom. Alternatively, when the lens barrel is attached to the camera, the lens mount 3 is discharged to the camera body side.

このように、アルミニウムを基材とする第１固定筒１と第２固定筒２には、締結部材としての第１ネジＳ１のネジ山径よりも小径の締結孔１ｂ，２ｂを開口しておけば、締結孔１ｂ，２ｂの内面にアルマイト膜等の絶縁膜Ａが形成されていても、第１ネジＳ１をタッピングしながら締結孔１ｂ，２ｂに螺入することで、第１固定筒１と第２固定筒２の電気導通が可能になる。したがって、特許文献１のような突起を有する特殊なネジは不要であり、汎用のネジが利用できる。また、特許文献２のように予め絶縁膜の一部を除去して導電部を露呈させるためのネジの挿通穴を開口する作業も不要でありレンズ鏡筒の製造が容易になる。 In this way, fastening holes 1b and 2b having a diameter smaller than the thread diameter of the first screw S1 as a fastening member may be opened in the first fixed cylinder 1 and the second fixed cylinder 2 that are made of aluminum. For example, even if an insulating film A such as an alumite film is formed on the inner surfaces of the fastening holes 1b and 2b, by screwing into the fastening holes 1b and 2b while tapping the first screw S1, the first fixed cylinder 1 and The second fixed cylinder 2 can be electrically connected. Therefore, a special screw having a protrusion as in Patent Document 1 is unnecessary, and a general-purpose screw can be used. In addition, as in Patent Document 2, it is not necessary to previously remove a part of the insulating film to open a screw insertion hole for exposing the conductive portion, which facilitates the manufacture of the lens barrel.

ここで、実施形態１の変形例として、図４に示すように第２ネジＳ２によりレンズマウント３と第１固定筒１とを電気導通させるようにしてもよい。図４は第２ネジＳ２の軸線方向に沿った前記レンズマウント３と第１固定筒１の締結箇所の断面図であり、（ａ）は第２ネジＳ２で締結する前の状態を示し、（ｂ）は締結した状態を示している。第２ネジＳ２はいわゆる皿ネジで構成され、ネジ頭部がレンズマウント３の後面から突出しないようになっている。レンズマウント３には予め第２ネジＳ２に対応したネジ溝を有する締結ネジ孔３ｂを開口している。一方、これに対応する第１固定筒１の締結孔１ｂは第２ネジし２のネジ山Ｓａの外径よりも小径でネジ溝が形成されていない円形の孔として開口されている。この締結孔１ｂは図３のものと同じである。そして、レンズマウント３の後面側から第２ネジＳ２を締結ネジ孔３ｂに螺合させ、さらに第１固定筒１の締結孔１ｂに螺入することで、第２ネジＳ２のネジ山Ｓａが第１固定筒１の締結孔１ｂの内周面をタッピングし、当該締結孔１ｂの内面のアルマイト膜Ａを破壊し、かつ基材のアルミニウムに達する。これにより、第２ネジＳ２のネジ部と締結ネジ孔３ｂのネジ部との直接接触によってレンズマウント３が第２ネジＳ２に電気導通するとともに、第１固定筒１の基材のアルミニウムが第２ネジＳ２のネジ山Ｓａにおいて電気導通される。したがって、レンズマウント３と第１固定筒１は第２ネジＳ２を介して相互に電気導通されることになる。 Here, as a modification of the first embodiment, as shown in FIG. 4, the lens mount 3 and the first fixed cylinder 1 may be electrically connected by the second screw S <b> 2. FIG. 4 is a cross-sectional view of a fastening position between the lens mount 3 and the first fixed cylinder 1 along the axial direction of the second screw S2, and (a) shows a state before fastening with the second screw S2. b) shows the fastened state. The second screw S <b> 2 is a so-called countersunk screw, and the screw head does not protrude from the rear surface of the lens mount 3. The lens mount 3 is previously provided with a fastening screw hole 3b having a thread groove corresponding to the second screw S2. On the other hand, the fastening hole 1b of the first fixed cylinder 1 corresponding to this is opened as a circular hole having a smaller diameter than the outer diameter of the thread Sa of the second screw 2 and having no thread groove. This fastening hole 1b is the same as that of FIG. Then, the second screw S2 is screwed into the fastening screw hole 3b from the rear surface side of the lens mount 3, and further screwed into the fastening hole 1b of the first fixed cylinder 1, whereby the thread Sa of the second screw S2 is changed to the first. The inner peripheral surface of the fastening hole 1b of the fixed cylinder 1 is tapped, the alumite film A on the inner surface of the fastening hole 1b is broken, and reaches the aluminum of the base material. Accordingly, the lens mount 3 is electrically connected to the second screw S2 by direct contact between the screw portion of the second screw S2 and the screw portion of the fastening screw hole 3b, and the aluminum of the base material of the first fixed cylinder 1 is the second. Electrical conduction is made at the thread Sa of the screw S2. Therefore, the lens mount 3 and the first fixed cylinder 1 are electrically connected to each other via the second screw S2.

（実施形態２）
図５は１つのネジでレンズマウント、第１固定筒、第２固定筒を一括して締結した実施形態２の要部の断面図である。すなわち、図１および図２に示したレンズ鏡筒において、レンズマウント３と第１固定筒１と第２固定筒２をレンズ光軸方向に積層し、かつそれぞれを順次密接した状態とし、この密接した箇所にそれぞれ開口した締結孔３ｂ，１ｂ，２ｂにレンズ鏡筒の後面側から長いネジＳ３を内挿して締結した構造である。図５（ａ）はネジＳ３での締結する前の状態であり、レンズマウント３には予めネジ部を形成した締結ネジ孔３ｂを開口するが、第１固定筒１と第２固定筒２は実施形態１と同様にネジＳ３の山径よりも小径の円形の締結孔１ｂ，２ｂを開口している。第１固定筒１と第２固定筒２の表面には締結孔１ｂ，２ｂの内面を含めてアルマイト膜Ａが形成されているが、レンズマウント３は真鍮で形成されており表面に絶縁膜が形成されていないことは実施形態１と同じである。 (Embodiment 2)
FIG. 5 is a cross-sectional view of a main part of the second embodiment in which the lens mount, the first fixed cylinder, and the second fixed cylinder are fastened together with one screw. That is, in the lens barrel shown in FIGS. 1 and 2, the lens mount 3, the first fixed cylinder 1, and the second fixed cylinder 2 are stacked in the lens optical axis direction, and are brought into close contact with each other in order. This is a structure in which a long screw S3 is inserted from the rear surface side of the lens barrel into the fastening holes 3b, 1b, and 2b that are opened at the respective positions. FIG. 5A shows a state before fastening with the screw S3, and the lens mount 3 is provided with a fastening screw hole 3b in which a screw portion is formed in advance, but the first fixed cylinder 1 and the second fixed cylinder 2 are As in the first embodiment, circular fastening holes 1b and 2b having a diameter smaller than the mountain diameter of the screw S3 are opened. An alumite film A including the inner surfaces of the fastening holes 1b and 2b is formed on the surfaces of the first fixed cylinder 1 and the second fixed cylinder 2, but the lens mount 3 is formed of brass and has an insulating film on the surface. The fact that it is not formed is the same as in the first embodiment.

そして、レンズマウント３の後面側からネジＳ３を締結ネジ孔３ｂに螺合させ、さらに第１固定筒１および第２固定筒２の各締結孔１ｂ，２ｂに順次螺入して行くことで、図５（ｂ）の断面図に示すように、ネジＳ３のネジ山が第１固定筒１と第２固定筒２の各締結孔１ｂ，２ｂの内面のアルマイト膜Ａを破壊しながらネジ山が基材のアルミニウムに達する深さまでタッピングする。これにより、レンズマウント３がネジＳ３に電気導通することは当然であるが、第１固定筒１と第２固定筒２の各基材のアルミニウムがネジＳ３電気導通される。 Then, the screw S3 is screwed into the fastening screw hole 3b from the rear surface side of the lens mount 3, and further screwed into the fastening holes 1b and 2b of the first fixed cylinder 1 and the second fixed cylinder 2 sequentially, As shown in the cross-sectional view of FIG. 5B, the thread of the screw S3 breaks the alumite film A on the inner surfaces of the fastening holes 1b and 2b of the first fixed cylinder 1 and the second fixed cylinder 2, and the thread is formed. Tapping to a depth that reaches the aluminum of the substrate. As a result, it is natural that the lens mount 3 is electrically connected to the screw S3, but the aluminum of each base material of the first fixed cylinder 1 and the second fixed cylinder 2 is electrically connected to the screw S3.

したがって、この実施形態２では、レンズマウント３と第１固定筒１および第２固定筒２はネジＳ３を介して相互に電気導通されることになる。特に、レンズマウント３と第２固定筒２の間に挟まれて配置される第１固定筒１では、前面と後面がネジＳ３に全く接触しない状態にあるため、例えば特許文献１のような突起を有するボルトやナットを用いても、これらボルトやナットに対して電気導通されることがないが、この実施形態２では当該中間に挟まれた状態の第１固定筒１でも締結孔１ｂの内面においてネジＳ３のネジ山に電気導通されることになり、ネジＳ３を介して両側のレンズマウント３と第２固定筒２に対して電気導通することが可能になる。 Therefore, in the second embodiment, the lens mount 3, the first fixed cylinder 1 and the second fixed cylinder 2 are electrically connected to each other via the screw S3. In particular, in the first fixed cylinder 1 disposed between the lens mount 3 and the second fixed cylinder 2, the front surface and the rear surface are not in contact with the screw S3 at all. Even if bolts and nuts having the above are used, they are not electrically connected to these bolts and nuts. However, in the second embodiment, even in the first fixed cylinder 1 sandwiched between the bolts and nuts, the inner surface of the fastening hole 1b In this case, electrical conduction is made to the thread of the screw S3, and electrical conduction can be made to the lens mount 3 and the second fixed cylinder 2 on both sides via the screw S3.

この実施形態２のレンズ鏡筒では、実施形態１と同様に、撮影者等からの静電気が第２固定筒２あるいは第１固定筒１に帯電されても、この静電気は第２固定筒２および第１固定筒１からレンズマウント３にまで移動され、ここから放電される。あるいは、レンズ鏡筒がカメラに装着されているときにはレンズマウント３からカメラ本体側に放電されることになる。また、この実施形態２においても、アルミニウムを基材とする第１固定筒１と第２固定筒２には、ネジＳ３の山径よりも小径の締結孔１ｂ，２ｂを開口しておけば、これら締結孔１ｂ，２ｂの内面にアルマイト膜等の絶縁膜が形成されていても、ネジＳ３をタッピングしながら螺入することで、第１固定筒１と第２固定筒２およびレンズマウント３の電気導通が可能になる。したがって、特許文献１のような突起を有する特殊なネジは不要であり、汎用のネジが利用できる。また、特許文献２のように予め絶縁膜の一部を除去してネジの挿通穴を開口する作業も不要でありレンズ鏡筒の製造が容易になる。 In the lens barrel of the second embodiment, as in the first embodiment, even if static electricity from a photographer or the like is charged to the second fixed cylinder 2 or the first fixed cylinder 1, the static electricity is It moves from the 1st fixed cylinder 1 to the lens mount 3, and is discharged from here. Alternatively, when the lens barrel is attached to the camera, the lens mount 3 is discharged to the camera body side. Also in the second embodiment, if the fastening holes 1b and 2b having a diameter smaller than the mountain diameter of the screw S3 are opened in the first fixed cylinder 1 and the second fixed cylinder 2 which are made of aluminum as a base material, Even if an insulating film such as an alumite film is formed on the inner surfaces of the fastening holes 1b and 2b, the first fixed cylinder 1, the second fixed cylinder 2 and the lens mount 3 can be inserted by tapping the screw S3 while tapping. Electrical conduction is possible. Therefore, a special screw having a protrusion as in Patent Document 1 is unnecessary, and a general-purpose screw can be used. Further, it is not necessary to remove a part of the insulating film in advance and open a screw insertion hole as in Patent Document 2, which facilitates the manufacture of the lens barrel.

実施形態２では、ネジＳ３により締結する３つの導電材料部材のうち１つのレンズマウント３は表面に絶縁膜が形成されていない場合について説明したが、本発明においては３つの導電材料部材が全て表面に絶縁膜が形成されている場合も同様であることは言うまでもない。この場合でも、３つの導電材料部材にネジの山径よりも小径の締結孔を開口しておき、この締結孔にネジを螺入することにより、３つの導電材料部材の全ての締結孔の内面の絶縁膜をネジ山によって破壊し、ネジを各導電材料部材の内層の導電材料に電気導通させ、当該ネジを介して３つの導電材料部材を電気導通させることが可能である。勿論、本発明は４つ以上の絶縁膜を有する導電材料部材を連通する場合でも有効であることは言うまでもない。 In the second embodiment, the case where one lens mount 3 is not formed with an insulating film on the surface among the three conductive material members fastened by the screw S3 is described. However, in the present invention, all three conductive material members are on the surface. Needless to say, the same applies to the case where an insulating film is formed. Even in this case, fastening holes having a diameter smaller than the thread diameter of the screw are opened in the three conductive material members, and the screws are screwed into the fastening holes, whereby the inner surfaces of all the fastening holes of the three conductive material members. It is possible to break the insulating film with a screw thread, electrically connect the screw to the conductive material of the inner layer of each conductive material member, and electrically connect the three conductive material members via the screw. Of course, it goes without saying that the present invention is effective even when conductive material members having four or more insulating films are communicated.

また、実施形態１の変形例において第１固定筒１とレンズマウント３を締結する場合、および実施形態２において第１固定筒１と第２固定筒２とレンズマウント３を締結する場合には、レンズマウント３の締結孔３ｂをネジの外径よりも大径なストレート孔で構成し、ネジはこの締結孔３ｂをストレートに通過し、締結孔２ｂと３ｂをタッピングする構成としてもよい。この構成ではネジ部においてレンズマウント３を第１固定筒１や第２固定筒２と電気導通することはできないが、頭部を有するネジであれば当該頭部においてレンズマウント３と電気導通するので、そのネジ部で第１固定筒１や第２固定筒２とも電気導通することが可能になる。 In the modification of the first embodiment, when the first fixed cylinder 1 and the lens mount 3 are fastened, and in the second embodiment, when the first fixed cylinder 1, the second fixed cylinder 2 and the lens mount 3 are fastened, The fastening hole 3b of the lens mount 3 may be configured as a straight hole having a diameter larger than the outer diameter of the screw, and the screw may pass through the fastening hole 3b straight and tapping the fastening holes 2b and 3b. In this configuration, the lens mount 3 cannot be electrically connected to the first fixed cylinder 1 or the second fixed cylinder 2 at the screw portion. However, if the screw has a head, the lens mount 3 is electrically connected to the lens mount 3 at the head. The screw portion can be electrically connected to the first fixed cylinder 1 and the second fixed cylinder 2.

本発明においては、図６（ａ）に実施形態１に適用した例を示すように、絶縁膜を有する導電材料部材をネジにより締結する場合、ネジの先端側、すなわちネジを螺入する側と反対側の導電材料部材に開口する締結孔は、当該反対側の面まで連通孔を開通させない、いわゆる盲孔として形成してもよい。この例では第１ネジＳ１が内挿される側と反対側の第２固定筒２の締結孔２ｃを盲孔として形成している。このようにすれば、締結孔１ｂ，２ｃにネジＳ１を螺入させたときにネジＳ１によるタッピングによって破壊されたアルマイト膜Ａや基材としてのアルミニウムの屑を当該締結孔２ｃとネジＳ１の頭部との空隙内に収容し、締結孔の外部に散乱することが防止できる。特に、実施形態１，２のように本発明をレンズ鏡筒の筒部材の締結に採用したときには、タッピングにより生じた屑がレンズ鏡筒の内部に散らばって異物となることもない。 In the present invention, as shown in an example applied to the first embodiment in FIG. 6A, when a conductive material member having an insulating film is fastened with a screw, the tip side of the screw, that is, the side into which the screw is screwed, The fastening hole that opens in the conductive material member on the opposite side may be formed as a so-called blind hole that does not open the communication hole to the surface on the opposite side. In this example, the fastening hole 2c of the second fixed cylinder 2 on the side opposite to the side where the first screw S1 is inserted is formed as a blind hole. In this way, when the screw S1 is screwed into the fastening holes 1b and 2c, the alumite film A destroyed by tapping with the screw S1 or aluminum scrap as a base material is removed from the head of the fastening hole 2c and the screw S1. It can accommodate in the space | gap with a part, and it can prevent scattering outside the fastening hole. In particular, when the present invention is used for fastening the cylindrical member of the lens barrel as in the first and second embodiments, the dust generated by tapping is not scattered inside the lens barrel and becomes a foreign substance.

また、本発明においては、図６（ｂ）に実施形態１に適用した例を示すように、絶縁膜を有する導電材料部材をネジにより締結する場合、ネジを螺入する側の導電材料部材の締結孔に、当該ネジを締結孔に導入するためのガイドネジ部を形成してもよい。ここでは第１固定筒１の締結孔１ｂの後面側にガイドネジ部１ｃを形成している。このガイドネジ部１ｃによってネジＳ１の先端を締結孔１ｂに円滑に螺入させることができ、引き続くネジの螺入によって締結孔１ｂの内面をタッピングすることが可能になる。なお、このガイドネジ部１ｃではタッピングが行われないので、この部分でのネジＳ１と第１固定筒１との電気導通は行われず、ガイドネジ部１ｃ以外の締結穴１ｂの内面で電気導通が行われる。 Moreover, in this invention, as shown in the example applied to Embodiment 1 in FIG.6 (b), when the electrically-conductive material member which has an insulating film is fastened with a screw | thread, the conductive material member of the side which screws in is screwed in A guide screw portion for introducing the screw into the fastening hole may be formed in the fastening hole. Here, a guide screw portion 1 c is formed on the rear surface side of the fastening hole 1 b of the first fixed cylinder 1. With this guide screw portion 1c, the tip of the screw S1 can be smoothly screwed into the fastening hole 1b, and the inner surface of the fastening hole 1b can be tapped by subsequent screwing. Since no tapping is performed in this guide screw portion 1c, electrical conduction between the screw S1 and the first fixed cylinder 1 is not performed in this portion, and electrical conduction is performed on the inner surface of the fastening hole 1b other than the guide screw portion 1c. Done.

（実施形態３）
図７は実施形態３の締結構造の概略構成の斜視図であり、この実施形態３では締結部材を鉄等の導電材料からなる圧入部材で構成したものであり、この圧入部材をここでは圧入ピンＰで構成したものである。この圧入ピンＰはピン軸部Ｐａと、それよりも大径の頭部ｂとで構成されており、当該ピン軸部Ｐｂの断面形状（ピン軸部の軸方向と垂直な方向の断面形状）は周縁部に鋭利な角部Ｐｃを有する断面形状に形成されている。図７ではピン軸部Ｐｂは四角柱に形成されており、周面に４つの直角の角部Ｐｃを有している。また、圧入ピンＰは締結される導電材料部材よりも硬い導電材料が用いられる。これに対応して導電材料部材、ここでは第１固定筒１と第２固定筒２に開口する締結孔１ｂ，２ｂは、当該ピン軸Ｐｂの対角線よりも短い直径の円形孔として形成されている。 (Embodiment 3)
FIG. 7 is a perspective view of a schematic configuration of the fastening structure of the third embodiment. In this third embodiment, the fastening member is constituted by a press-fitting member made of a conductive material such as iron, and this press-fitting member is here a press-fitting pin. It is composed of P. The press-fit pin P is composed of a pin shaft portion Pa and a head portion b having a larger diameter than the pin shaft portion Pa. Is formed in a cross-sectional shape having sharp corners Pc at the periphery. In FIG. 7, the pin shaft portion Pb is formed in a quadrangular prism, and has four right-angle corners Pc on the peripheral surface. The press-fit pin P is made of a conductive material that is harder than the conductive material member to be fastened. Correspondingly, the fastening holes 1b, 2b opened in the conductive material member, here the first fixed cylinder 1 and the second fixed cylinder 2, are formed as circular holes having a diameter shorter than the diagonal of the pin axis Pb. .

この実施形態３では、図８（ａ），（ｂ）に圧入方向に垂直な方向の断面図とｂ−ｂ線断面図を示すように、第１固定筒１と第２固定筒２はそれぞれ実施形態１と同様に締結孔１ｂ，２ｂを含む表面にアルマイト膜等の絶縁膜Ａが形成されている。そして、第１固定筒１側から圧入ピンＰのピン軸部Ｐｂを圧入させる。圧入ピンＰはピン軸部Ｐｂが締結孔１ｂ，２ｂ内を圧入されるのに伴い、ピン軸Ｐｂの４つの角部Ｐｃが締結孔１ｂ，２ｂの内面の絶縁膜Ａを破壊する。そして、最終位置まで圧入されたときには、４つの角部Ｐｃは締結孔１ｂ，２ｂの内面の絶縁膜Ａを破壊した箇所において第１固定筒１と第２固定筒２の基材であるアルミニウムにそれぞれ電気導通される。したがって、第１固定筒１と第２固定筒２は圧入ピンＰを介して相互に電気導通されることになる。 In the third embodiment, as shown in FIGS. 8A and 8B, a cross-sectional view perpendicular to the press-fitting direction and a cross-sectional view taken along the line bb, the first fixed tube 1 and the second fixed tube 2 are respectively As in the first embodiment, an insulating film A such as an alumite film is formed on the surface including the fastening holes 1b and 2b. Then, the pin shaft portion Pb of the press-fit pin P is press-fitted from the first fixed cylinder 1 side. In the press-fit pin P, as the pin shaft portion Pb is press-fitted in the fastening holes 1b and 2b, the four corner portions Pc of the pin shaft Pb destroy the insulating film A on the inner surfaces of the fastening holes 1b and 2b. And when it press-fits to the last position, four corner | angular parts Pc are in the aluminum which is a base material of the 1st fixed cylinder 1 and the 2nd fixed cylinder 2 in the location which destroyed the insulating film A of the inner surface of the fastening holes 1b and 2b. Each is electrically connected. Therefore, the first fixed cylinder 1 and the second fixed cylinder 2 are electrically connected to each other via the press-fit pin P.

実施形態３では、圧入ピンＰはピン軸部Ｐｂの周縁部に締結孔の内面の絶縁膜を破壊することが可能な角部を有していればよく、その形状については特定されるものではない。したがって、例えば図９（ａ）に示すように、ピン軸部が五角柱をした圧入ピンＰ１、あるいは図示は省略するが三角柱、六角柱等の角柱で形成された圧入ピンであってもよい。あるいは図９（ｂ）に示すように、円周面に軸方向の複数の突条が形成されたスプライン構造のピン軸部を有する圧入ピンＰ２であってもよい。この場合、圧入ピンを締結孔に圧入し易くするために、図示は省略するが先端を先細の形状、例えば円錐あるいは角錐に形成してもよい。また、圧入ピンを圧入した後に先端をカシメ締結するカシメピンとして形成してもよい。圧入ピンによる締結の場合でも、図５（ａ）に示したように、先端側の導電材料部材に開口する締結孔は盲孔としてもよく、圧入により生じる絶縁膜の屑が締結孔の外に散らばることが防止できる。 In the third embodiment, the press-fit pin P only needs to have a corner portion capable of breaking the insulating film on the inner surface of the fastening hole at the peripheral portion of the pin shaft portion Pb, and the shape thereof is not specified. Absent. Therefore, for example, as shown in FIG. 9 (a), the pin shaft portion may be a press-fit pin P1 having a pentagonal column, or a press-fit pin formed by a prism such as a triangular column or a hexagonal column although not shown. Alternatively, as shown in FIG. 9B, a press-fit pin P2 having a pin shaft portion of a spline structure in which a plurality of axial ridges are formed on the circumferential surface may be used. In this case, in order to make it easy to press-fit the press-fit pin into the fastening hole, the tip may be formed in a tapered shape, for example, a cone or a pyramid, although not shown. Moreover, you may form as a crimping pin which crimps | tightens the front-end | tip after crimping a press-fit pin. Even in the case of fastening with a press-fit pin, as shown in FIG. 5A, the fastening hole opened in the conductive material member on the front end side may be a blind hole, and the debris of the insulating film generated by the press-fit is outside the fastening hole. It can be prevented from being scattered.

以上の実施形態では本発明をレンズ鏡筒を構成する複数の筒部材を相互に電気導通した状態で締結する構成例について説明したが、本発明における導電材料部材は筒部材に限られるものではなく板状部材や柱状部材等に対しても適用が可能である。また、導電材料部材の表面の絶縁膜は、実施形態のアルマイト膜に限られるものではなく塗装膜や蒸着膜等の絶縁膜の場合にも適用することができる。ただし、この場合には締結部材はこれら絶縁膜よりも硬度の高い導電材料を用いることが肝要である。 In the above embodiment, the configuration example in which the present invention is fastened with a plurality of cylindrical members constituting the lens barrel being electrically connected to each other has been described. However, the conductive material member in the present invention is not limited to the cylindrical member. The present invention can also be applied to plate-like members, columnar members, and the like. In addition, the insulating film on the surface of the conductive material member is not limited to the alumite film of the embodiment, and can also be applied to an insulating film such as a paint film or a vapor deposition film. However, in this case, it is important to use a conductive material having a higher hardness than these insulating films for the fastening member.

本発明は表面に絶縁膜を有する導電材料部材を１枚、あるいは複数枚を重ねた状態で孔内に締結部材を内挿し、あるいは締結部材により相互に締結し、導電材料部材と締結部材、あるいは導電材料部材を相互に電気導通することが要求される締結構造に採用して有効である。 In the present invention, one or more conductive material members having an insulating film on the surface are inserted into a hole, or a fastening member is fastened to each other by a fastening member. It is effective when employed in a fastening structure in which conductive material members are required to be electrically connected to each other.

１第１固定筒（導電材料部材）
１ｂ締結孔
２第２固定筒（導電材料部材）
２ｂ締結孔
３レンズマウント
８回路基板（電子回路）
Ｓ１，Ｓ２，Ｓ３ネジ（締結部材）
Ｓａネジ山
Ｐ，Ｐ１，Ｐ２圧入ピン（圧入部材）
Ｐｂピン軸部
Ｐｃ角部
1 First fixed cylinder (conductive material member)
1b Fastening hole 2 Second fixed cylinder (conductive material member)
2b Fastening hole 3 Lens mount 8 Circuit board (electronic circuit)
S1, S2, S3 screw (fastening member)
Sa thread P, P1, P2 Press-fit pin (press-fit member)
Pb Pin shaft Pc Corner

Claims

表面に絶縁膜が存在する複数の導電材料部材が積層され、これら導電材料部材に開口された締結孔内に導電性の締結部材が内挿されている構成を含む締結構造であって、内挿された締結部材は前記締結孔の内面の絶縁膜が除去された箇所において前記導電材料部材に電気導通されていることを特徴とする導電材料部材の締結構造。 A fastening structure including a configuration in which a plurality of conductive material members having an insulating film on the surface are laminated, and a conductive fastening member is inserted into a fastening hole opened in the conductive material member. A fastening structure for a conductive material member, wherein the fastening member is electrically connected to the conductive material member at a location where the insulating film on the inner surface of the fastening hole is removed.

前記複数の導電材料部材は当該締結部材により締結されるとともに、当該締結部材を介して電気導通されていることを特徴とする請求項１に記載の導電材料部材の締結構造。 The fastening structure for a conductive material member according to claim 1, wherein the plurality of conductive material members are fastened by the fastening member and electrically conducted through the fastening member.

前記複数の導電材料部材のうち、少なくとも１つの導電材料部材に絶縁膜が存在していることを特徴とする請求項２に記載の導電材料部材の締結構造。 The fastening structure for a conductive material member according to claim 2, wherein an insulating film is present on at least one of the plurality of conductive material members.

前記締結孔は円形の孔であり、前記締結部材は前記締結孔の内径よりも外径の大きなネジで形成され、前記導電材料部材と前記締結部材の電気導通箇所は当該ネジを内挿したときにセルフタッピングにより絶縁膜が除去された箇所であることを特徴とする請求項１ないし３のいずれかに記載の導電材料部材の締結構造。 The fastening hole is a circular hole, the fastening member is formed by a screw having an outer diameter larger than the inner diameter of the fastening hole, and the electrically conductive portion of the conductive material member and the fastening member is inserted when the screw is inserted. 4. The fastening structure for a conductive material member according to claim 1, wherein the insulating material is removed by self-tapping.

前記締結孔は前記ネジを内挿する側の内面の一部に当該ネジに螺合可能なネジ部が形成されていることを特徴とする請求項４に記載の導電材料部材の締結構造。 The fastening structure for a conductive material member according to claim 4, wherein the fastening hole is formed with a screw portion that can be screwed into the screw on a part of an inner surface on the side where the screw is inserted.

前記締結部材は前記締結孔の開口形状とは異なる断面形状の圧入部材で形成され、前記導電材料部材と前記締結部材の電気導通箇所は当該圧入部材を圧入したときに衝接により絶縁膜が除去された箇所であることを特徴とする請求項１ないし３のいずれかに記載の導電材料部材の締結構造。 The fastening member is formed by a press-fitting member having a cross-sectional shape different from the opening shape of the fastening hole, and the electrically conductive portion of the conductive material member and the fastening member is removed by the contact when the press-fitting member is pressed. The fastening structure for a conductive material member according to any one of claims 1 to 3, wherein the fastening structure is a portion that has been formed.

前記圧入部材は周面の少なくとも一部に外径方向に突出した角部を有し、当該角部が前記締結孔の内面の絶縁膜に衝接されることを特徴とする請求項６に記載の導電材料部材の締結構造。 The said press-fitting member has a corner | angular part which protruded in the outer-diameter direction in at least one part of the surrounding surface, The said corner | angular part is contact | abutted by the insulating film of the inner surface of the said fastening hole. Fastening structure of conductive material member.

前記締結孔は円形の孔であり、前記圧入部材は三角柱、四角柱を含む角柱あるいはスプライン構造体であることを特徴とする請求項７に記載の導電材料部材の締結構造。 The fastening structure for a conductive material member according to claim 7, wherein the fastening hole is a circular hole, and the press-fitting member is a triangular prism including a triangular prism, a quadrangular prism, or a spline structure.

前記締結孔は締結部材を内挿する側と反対側が閉じられている盲孔であることを特徴とする請求項１ないし８のいずれかに記載の導電材料部材の締結構造。 The fastening structure for a conductive material member according to any one of claims 1 to 8, wherein the fastening hole is a blind hole closed on a side opposite to a side on which the fastening member is inserted.

前記導電材料部材はレンズ鏡筒を構成する複数の筒部材の少なくとも１つの筒部材として形成されていることを特徴とする請求項１ないし９のいずれかに記載の導電材料部材の締結構造。 The fastening structure for a conductive material member according to claim 1, wherein the conductive material member is formed as at least one cylindrical member of a plurality of cylindrical members constituting a lens barrel.

前記筒部材は内部に静電気の影響を受ける電子回路を内蔵していることを特徴とする請求項１０に記載の導電材料部材の締結構造。 The fastening structure for a conductive material member according to claim 10, wherein the cylindrical member contains an electronic circuit that is affected by static electricity.

前記レンズ鏡筒はカメラボディに装着されるレンズマウントを備え、前記筒部材に帯電される静電気を当該レンズマウントに導電させることを特徴とする請求項１０または１１に記載の導電材料部材の締結構造。

12. The fastening structure for a conductive material member according to claim 10, wherein the lens barrel includes a lens mount attached to a camera body, and causes the lens mount to conduct static electricity charged to the cylindrical member. .