JP5448990B2 - Lens unit accessory attachment / detachment mechanism - Google Patents
Lens unit accessory attachment / detachment mechanism Download PDFInfo
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- JP5448990B2 JP5448990B2 JP2010090686A JP2010090686A JP5448990B2 JP 5448990 B2 JP5448990 B2 JP 5448990B2 JP 2010090686 A JP2010090686 A JP 2010090686A JP 2010090686 A JP2010090686 A JP 2010090686A JP 5448990 B2 JP5448990 B2 JP 5448990B2
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- 238000003384 imaging method Methods 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- Lens Barrels (AREA)
- Blocking Light For Cameras (AREA)
- Structure And Mechanism Of Cameras (AREA)
- Accessories Of Cameras (AREA)
Description
本発明は、レンズ装置のアクセサリ着脱機構に係り、特にレンズ鏡胴の先端部にワイドコンバータ等のアクセサリ部品が着脱自在に構成されるレンズ装置のアクセサリ着脱機構に関する。 The present invention relates to an accessory attaching / detaching mechanism for a lens apparatus, and more particularly to an accessory attaching / detaching mechanism for a lens apparatus in which an accessory part such as a wide converter is detachably attached to the tip of a lens barrel.
従来、ＥＮＧカメラ等の業務用ハンディカメラに用いられる撮影レンズ（ズームレンズ）は、前玉繰り出しと呼ばれる方式、即ち、前玉のフォーカスレンズ群全体を繰り出してフォーカシングを行うのが一般的であったが、近年の更なる小型化、軽量化の下、インナーフォーカス式のズームレンズが広く用いられるようになっている。 Conventionally, a photographing lens (zoom lens) used for a handheld camera for business use such as an ENG camera is generally a method called front lens extension, that is, focusing is performed by extending the entire front lens group. However, with the recent further reduction in size and weight, inner focus zoom lenses have been widely used.
このようなインナーフォーカス式ズームレンズでは、レンズ鏡胴の内部には光学系を構成する各種レンズ等が保持されており、その後端部には、カメラ本体に対して例えばバヨネット方式により着脱可能に装着されるマウントが設けられ、レンズ鏡胴の外周部（レンズ鏡胴の各種構成部材を支持する鏡胴本体の外周部）には、内部に保持したフォーカス用のレンズ（フォーカスレンズ群）、ズーム用のレンズ（変倍レンズ群）、絞り等にメカ的に連結されてそれらを駆動するための操作リングが回動可能に設けられている。 In such an inner focus type zoom lens, various lenses constituting an optical system are held inside the lens barrel, and the rear end portion thereof is detachably attached to the camera body by, for example, a bayonet method. Mounted on the outer periphery of the lens barrel (the outer periphery of the lens barrel body that supports various components of the lens barrel), a focus lens (focus lens group) held inside, and a zoom lens An operation ring that is mechanically coupled to the lens (a variable magnification lens group), a diaphragm, and the like to drive them is rotatably provided.
また、レンズ鏡胴の先端部には、レンズフード、ワイドコンバータ、テレコンバータ等の各種アクセサリ部品（以下、「前面アクセサリ」ともいう。）を装着することができるようになっている。アクセサリ部品とレンズ鏡胴とは、アクセサリ部品に設けられた装着部と、レンズ鏡胴の先端に設けられた装着部とからなる着脱機構によって着脱自在に構成される（例えば特許文献１参照）。 Further, various accessory parts (hereinafter also referred to as “front accessories”) such as a lens hood, a wide converter, and a teleconverter can be attached to the tip of the lens barrel. The accessory part and the lens barrel are configured to be detachable by an attachment / detachment mechanism including an attachment part provided in the accessory part and an attachment part provided at the tip of the lens barrel (see, for example, Patent Document 1).
しかしながら、特許文献１に開示されるような着脱機構では、アクセサリ部品に形成されたネジ部をレンズ鏡胴に形成されたネジ部に螺合させることで、前記アクセサリ部品がレンズ鏡胴の先端部に装着される構造となっているため、アクセサリ部品の着脱を容易に行える利点があるものの、振動や衝撃等の外力が加えられると、レンズ鏡胴とアクセサリ部品を締結するネジ部が緩みやすいといった欠点がある。 However, in the attachment / detachment mechanism as disclosed in Patent Document 1, the accessory part is screwed into the screw part formed on the lens barrel so that the accessory part is attached to the tip part of the lens barrel. Although there is an advantage that attachment / detachment of the accessory parts can be easily performed, the screw part for fastening the lens barrel and the accessory parts is easy to loosen when an external force such as vibration or impact is applied. There are drawbacks.
特に、ワイドコンバータやテレコンバータ等の補助レンズがレンズ鏡胴の先端部に装着される場合には、補助レンズとレンズ鏡胴を締結するためのネジ部が緩んだ状態で使用されると、補助レンズとレンズ鏡胴の光軸に位置ずれが生じてフォーカス精度の低下を招き、最悪の場合には補助レンズが脱落してしまう恐れがある。 In particular, when an auxiliary lens such as a wide converter or a teleconverter is attached to the tip of the lens barrel, the auxiliary lens and the lens barrel are used with the screw part for fastening them loosened. A positional shift occurs between the lens and the optical axis of the lens barrel, resulting in a decrease in focus accuracy. In the worst case, the auxiliary lens may fall off.
本発明は、このような事情に鑑みてなされたもので、アクセサリ部品とレンズ鏡胴の光軸に位置ずれが生じることなく、高精度のフォーカス動作を可能とするレンズ装置のアクセサリ着脱機構を提供することを目的とする。 The present invention has been made in view of such circumstances, and provides an accessory attachment / detachment mechanism for a lens apparatus that enables high-precision focusing operation without causing positional displacement between the accessory component and the optical axis of the lens barrel. The purpose is to do.
前記目的を達成するために、本発明に係るレンズ装置のアクセサリ着脱機構は、レンズ鏡胴の先端部にアクセサリ部品が着脱自在に構成されるレンズ装置のアクセサリ着脱機構において、前記レンズ鏡胴の先端部には円筒状に突出形成された鏡胴側装着部が設けられ、該鏡胴側装着部の外周面には複数の係合部が周方向に沿って等間隔で形成され、前記アクセサリ部品の後端部には円筒状に突出形成されたアクセサリ側装着部が設けられ、該アクセサリ側装着部の内周面には前記複数の係合部にそれぞれ対応する位置に複数の係止爪が周方向に沿って等間隔で形成され、前記アクセサリ側装着部の内側に前記鏡胴側装着部が挿入された状態で前記複数の係止爪がそれぞれ対応する前記複数の係合部に係止することにより、前記レンズ鏡胴の先端部に前記アクセサリ部品が装着されるレンズ装置のアクセサリ着脱機構であって、前記アクセサリ部品は、１又は複数のレンズが保持される金属製のレンズ枠と、該レンズ枠の後端部に連結固定される樹脂製の円筒部と、を備えた補助レンズであり、前記アクセサリ側装着部の内周面には周方向に沿って内側に向けて突出する突出部が前記レンズ枠と一体的に設けられ、該突出部は、前記アクセサリ側装着部に径方向の外力が作用した場合に前記鏡胴側装着部の外周面に当接するように構成されることを特徴とする。 In order to achieve the above object, an accessory attaching / detaching mechanism for a lens apparatus according to the present invention is an accessory attaching / detaching mechanism for a lens apparatus in which an accessory part is detachably attached to the tip of the lens barrel. The lens barrel side mounting portion that is formed in a cylindrical shape is provided on the portion, and a plurality of engaging portions are formed at equal intervals along the circumferential direction on the outer peripheral surface of the lens barrel side mounting portion, An accessory side mounting portion that is formed in a cylindrical shape is provided at the rear end portion, and a plurality of locking claws are provided at positions corresponding to the plurality of engaging portions on the inner peripheral surface of the accessory side mounting portion, respectively. Formed at equal intervals along the circumferential direction, the plurality of locking claws are locked to the corresponding engaging portions in a state where the lens barrel side mounting portion is inserted inside the accessory side mounting portion. The tip of the lens barrel An accessory attachment / detachment mechanism of a lens apparatus in which the accessory part is mounted on a part, wherein the accessory part is connected and fixed to a metal lens frame that holds one or more lenses and a rear end part of the lens frame. A cylindrical portion made of resin, and a protrusion projecting inward along the circumferential direction is provided integrally with the lens frame on the inner peripheral surface of the accessory-side mounting portion The protrusion is configured to contact the outer peripheral surface of the lens barrel side mounting portion when a radial external force acts on the accessory side mounting portion.
本発明によれば、アクセサリ側装着部の内周面に設けられた突出部が鏡胴側装着部の外周面に当接することにより外力による衝撃が分散される。これにより、アクセサリ部品とレンズ鏡胴との光軸の位置ずれが防止され、高精度なフォーカス動作が可能となる。また、アクセサリ部品の脱落も防止することができる。 According to the present invention, the impact caused by the external force is dispersed by the protrusion provided on the inner peripheral surface of the accessory-side mounting portion coming into contact with the outer peripheral surface of the lens barrel-side mounting portion. As a result, the displacement of the optical axis between the accessory part and the lens barrel is prevented, and a highly accurate focusing operation is possible. Also, the accessory parts can be prevented from falling off.
本発明では、前記突出部は、前記外力が作用しない場合には前記鏡胴側装着部の外周面との間に所定のクリアランスが設けられることが好ましい。これにより、突出部が鏡胴側装着部に干渉することなく、アクセサリ部品をレンズ鏡胴に容易に装着できる。 In the present invention, it is preferable that a predetermined clearance is provided between the projecting portion and the outer peripheral surface of the lens barrel side mounting portion when the external force does not act. Accordingly, the accessory part can be easily mounted on the lens barrel without the projection portion interfering with the lens barrel side mounting portion.
また、本発明では、前記突出部は、前記アクセサリ部品の内周面の周方向全体にわたって円環状に形成されることが好ましい。これにより、外力が加えられる方向に左右されることなく、外力による衝撃を分散させることができる。 Moreover, in this invention, it is preferable that the said protrusion part is formed in an annular shape over the whole circumferential direction of the internal peripheral surface of the said accessory component. Thereby, the impact by an external force can be disperse | distributed, without being influenced by the direction in which an external force is applied.
本発明によれば、アクセサリ側装着部の内周面に設けられた突出部が鏡胴側装着部の外周面に当接することにより外力による衝撃が分散される。これにより、アクセサリ部品とレンズ鏡胴との光軸の位置ずれが防止され、高精度なフォーカス動作が可能となる。また、アクセサリ部品の脱落も防止することができる。 According to the present invention, the impact caused by the external force is dispersed by the protrusion provided on the inner peripheral surface of the accessory-side mounting portion coming into contact with the outer peripheral surface of the lens barrel-side mounting portion. As a result, the displacement of the optical axis between the accessory part and the lens barrel is prevented, and a highly accurate focusing operation is possible. Also, the accessory parts can be prevented from falling off.
以下、添付図面に従って、本発明に係るレンズ装置のアクセサリ着脱機構の形態について詳述する。 Hereinafter, according to the attached drawings, the accessory attachment / detachment mechanism of the lens device according to the present invention will be described in detail.
〔撮影レンズの全体構成の説明〕
図１は、本発明に係るレンズ装置のアクセサリ着脱機構が適用される撮影レンズの外観構成を示した上面図である。
[Description of overall configuration of photographic lens]
FIG. 1 is a top view showing an external configuration of a photographing lens to which an accessory attaching / detaching mechanism of a lens apparatus according to the present invention is applied.
図１に示す撮影レンズ２は、放送用又は業務用として取材などで携帯されるＥＮＧカメラ等のカメラ装置に後端のマウント部１８により着脱可能に装着されるレンズ装置であり、主としてレンズ鏡胴４と駆動ユニット２０とから構成されている。 A photographic lens 2 shown in FIG. 1 is a lens device that is detachably attached to a camera device such as an ENG camera carried for coverage of broadcasting or business by a mount 18 at the rear end, and mainly a lens barrel. 4 and the drive unit 20.
レンズ鏡胴４は、前方側（対物側）から入射される被写体光を集光してカメラ装置の撮像面に被写体像を結像する撮影光学系を内部に保持しており、その撮影光学系の構成部品として、フォーカスレンズ（群）、ズームレンズ（群）、絞り、リレーレンズ（群）等を備えている。 The lens barrel 4 internally holds a photographing optical system that collects subject light incident from the front side (object side) and forms a subject image on the imaging surface of the camera device. These components include a focus lens (group), a zoom lens (group), a diaphragm, a relay lens (group), and the like.
また、レンズ鏡胴４は、外周部に回動可能なフォーカスリング１０、ズームリング１２、アイリスリング１４を備えており、フォーカスリング１０を回動操作すると、前記フォーカスレンズが光軸に沿って前後移動してピント位置が変化し、ズームリング１２を回動操作すると、前記ズームレンズが光軸に沿って前後移動して焦点距離が変化し、アイリスリング１４を回動操作すると、前記絞りが開閉動作して絞り値が変化するようになっている。更に同図のレンズ鏡胴４は、後部にエクステンダー１６を備えており、図示しないレバーを回動操作することによって像倍率を例えば１倍と２倍とで切り替えることができるようになっている。 The lens barrel 4 includes a focus ring 10, a zoom ring 12, and an iris ring 14 that are rotatable on the outer peripheral portion. When the focus ring 10 is rotated, the focus lens moves back and forth along the optical axis. When the zoom ring 12 is rotated by moving and the zoom ring 12 is rotated, the zoom lens is moved back and forth along the optical axis to change the focal length. When the iris ring 14 is rotated, the aperture is opened and closed. It operates to change the aperture value. Further, the lens barrel 4 shown in the figure is provided with an extender 16 at the rear, and the image magnification can be switched between, for example, 1 × and 2 × by rotating a lever (not shown).
駆動ユニット２０は、レンズ鏡胴４の側部に取り付けられており、その駆動ユニット２０のケーシング内部には、レンズ鏡胴４のフォーカスリング１０、ズームリング１２、アイリスリング１４の各々に係合したモータや各モータを駆動制御する回路部品等が内蔵されている。また、説明を省略するが駆動ユニット２０のケーシングの外面にはレンズ操作のための各種操作部材が設けられている。 The drive unit 20 is attached to the side of the lens barrel 4, and the focus ring 10, the zoom ring 12, and the iris ring 14 of the lens barrel 4 are engaged with each other inside the casing of the drive unit 20. Built-in motors and circuit components for driving and controlling the motors. Although not described, various operation members for lens operation are provided on the outer surface of the casing of the drive unit 20.
図１のレンズ鏡胴４の先端部（図１中左側端の被写体側）には、撮影光学系の焦点距離を所定倍率分、広角側にシフトさせるワイドコンバータ３０が取り付けられている。ワイドコンバータ３０は、レンズ鏡胴４から着脱可能な構造を有し、ワイドコンバータ３０の代わりに他の種類の前面アクセサリをレンズ鏡胴４の先端部に装着することができるようになっている。 A wide converter 30 for shifting the focal length of the photographic optical system to the wide-angle side by a predetermined magnification is attached to the tip of the lens barrel 4 in FIG. 1 (the subject side at the left end in FIG. 1). The wide converter 30 has a structure that can be attached to and detached from the lens barrel 4, and other types of front accessories can be attached to the tip of the lens barrel 4 instead of the wide converter 30.
ワイドコンバータ３０以外の前面アクセサリとしては、例えば、撮影光学系の焦点距離を所定倍率分、望遠側にシフトさせるテレコンバータ、画面のアスペクト比を１６：９から４：３にした時に変化する画像サイズを本来のサイズにするレシオコンバータ、撮影画角外からの光を遮断するレンズフードなどが提供されている。 Front accessories other than the wide converter 30 include, for example, a teleconverter that shifts the focal length of the photographic optical system to the telephoto side by a predetermined magnification, and an image size that changes when the screen aspect ratio is changed from 16: 9 to 4: 3. A ratio converter that brings the camera to its original size and a lens hood that blocks light from outside the field of view are provided.
これらの前面アクセサリとレンズ鏡胴４とは、前面アクセサリの後端部に設けられた装着部（以下、「アクセサリ側装着部」という。）と、レンズ鏡胴４の先端部に設けられた装着部（以下、「鏡胴側装着部」という。）と、からなる着脱機構によって着脱できるようになっており、アクセサリ側装着部は交換可能とする任意の種類の前面アクセサリにおいて同一の基本構造を有して形成され、鏡胴側装着部も、それらの前面アクセサリを装着可能とする任意の種類のレンズ鏡胴において同一の基本構造を有して形成されている。 The front accessory and the lens barrel 4 include a mounting portion provided at the rear end portion of the front accessory (hereinafter referred to as “accessory side mounting portion”) and a mounting portion provided at the front end portion of the lens barrel 4. (Hereinafter referred to as the “lens barrel side mounting portion”), and the attachment side mounting portion can be attached and detached, and the accessory side mounting portion has the same basic structure in any type of front accessory that can be replaced. The lens barrel side mounting portion is also formed to have the same basic structure in any type of lens barrel capable of mounting these front accessories.
図２は、レンズ鏡胴４からワイドコンバータ３０を取り外した状態を示す図である。同図に示すように、レンズ鏡胴４は先端部にワイドコンバータ３０を取り付けるための鏡胴側装着部４０が設けられている。鏡胴側装着部４０は、ワイドコンバータ３０の後端部に設けられるアクセサリ側装着部（図３又は図４に符号６０を付して図示）と連結される。 FIG. 2 is a diagram illustrating a state where the wide converter 30 is removed from the lens barrel 4. As shown in the figure, the lens barrel 4 is provided with a barrel side mounting portion 40 for attaching the wide converter 30 to the tip portion. The lens barrel side mounting portion 40 is connected to an accessory side mounting portion (shown with reference numeral 60 in FIG. 3 or FIG. 4) provided at the rear end portion of the wide converter 30.
鏡胴側装着部４０とアクセサリ側装着部とによる前面アクセサリの着脱構造（アクセサリ着脱機構）については後で詳しく説明するが、レンズ鏡胴４の先端部には円筒状に突出形成された円筒部４２が設けられており、該円筒部４２の外周面上には複数の係合部４４が形成されている。一方、ワイドコンバータ３０に設けられるアクセサリ側装着部は、係合部４４に対応する構造が設けられている。かかる構造を有するワイドコンバータ３０の後端部にレンズ鏡胴４の先端部の円筒部４２を挿入し、ワイドコンバータ３０を所定の方向に回転させると、鏡胴側装着部４０とアクセサリ側装着部が連結されるとともにロックされる。 The attachment / detachment structure (accessory attachment / detachment mechanism) of the front accessory by the lens barrel side mounting portion 40 and the accessory side mounting portion will be described in detail later, but a cylindrical portion that is formed in a cylindrical shape protruding from the distal end portion of the lens barrel 4 42 is provided, and a plurality of engaging portions 44 are formed on the outer peripheral surface of the cylindrical portion 42. On the other hand, the accessory side mounting portion provided in the wide converter 30 is provided with a structure corresponding to the engaging portion 44. When the cylindrical portion 42 at the front end of the lens barrel 4 is inserted into the rear end portion of the wide converter 30 having such a structure and the wide converter 30 is rotated in a predetermined direction, the lens barrel side mounting portion 40 and the accessory side mounting portion. Are connected and locked.
〔ワイドコンバータ（前面アクセサリ）の説明〕
図３は、ワイドコンバータ３０の内部構造を示す断面図である。尚、図３では、ワイドコンバータ３０の後端部にレンズ鏡胴４の先端部の円筒部４２が挿入され、鏡胴側装着部４０とアクセサリ側装着部が連結されてロックされた状態が図示されている。
[Description of wide converter (front accessory)]
FIG. 3 is a cross-sectional view showing the internal structure of the wide converter 30. 3 shows a state in which the cylindrical portion 42 at the tip of the lens barrel 4 is inserted into the rear end portion of the wide converter 30, and the lens barrel side mounting portion 40 and the accessory side mounting portion are connected and locked. Has been.
図３に示すように、ワイドコンバータ３０は、内部に複数のレンズが固定保持されるレンズ枠１００と、該レンズ枠１００の後端部に連結固定される円筒部６２と、を備えて構成される。尚、レンズ枠１００の一部（後端部）と円筒部６２は、アクセサリ側装着部６０の構成要素である。 As shown in FIG. 3, the wide converter 30 includes a lens frame 100 in which a plurality of lenses are fixed and held, and a cylindrical portion 62 connected and fixed to the rear end portion of the lens frame 100. The A part (rear end portion) of the lens frame 100 and the cylindrical portion 62 are components of the accessory side mounting portion 60.
本実施形態におけるワイドコンバータ３０は、２つの異なる部材からなる２ピース構造を有しており、レンズ枠１００はアルミ等の金属部材で構成され、円筒部６２はＡＢＳ樹脂等の樹脂部材で構成される。このような２ピース構造によれば、レンズを保持するために所定の強度を確保しつつ、全体的な軽量化を図ることができ、携帯性や操作性を向上させることが可能となる。 The wide converter 30 in the present embodiment has a two-piece structure composed of two different members, the lens frame 100 is made of a metal member such as aluminum, and the cylindrical portion 62 is made of a resin member such as ABS resin. The According to such a two-piece structure, the overall weight can be reduced while securing a predetermined strength for holding the lens, and portability and operability can be improved.
もっと言えば、レンズを保持する部分は、強度、精度の面から金属材料が好ましく、レンズ鏡胴と係合する部分は係止爪等の複雑な構造を成形しやすく鏡胴に傷をつけにくい樹脂材料が好ましいため、このような２ピース構造を採用している。 More specifically, the metal holding part is preferably a metal material from the viewpoint of strength and accuracy, and the part that engages the lens barrel is easy to mold a complicated structure such as a locking claw and is difficult to damage the lens barrel. Since a resin material is preferable, such a two-piece structure is adopted.
レンズ枠１００の内部には、最も後側に固定される第１のレンズ１０２と、第１のレンズ１０２の前側面１０２Ａを支持する間隔環１０４と、間隔環１０４によって第１のレンズ１０２との間の光軸方向における間隔が決められて固定される第２のレンズ１０６と、第２のレンズ１０６の前側面１０６Ａを支持する押え環１０８と、第２のレンズ１０６の前側に固定される第３のレンズ１１０と、第３のレンズ１１０の前側面１１０Ａを支持する押え環１１２と、を具備している。 Inside the lens frame 100, there are a first lens 102 fixed to the rearmost side, a spacing ring 104 that supports the front side surface 102 </ b> A of the first lens 102, and the first lens 102 by the spacing ring 104. A second lens 106 fixed at a predetermined distance in the optical axis direction, a presser ring 108 that supports the front side surface 106A of the second lens 106, and a second lens 106 fixed to the front side of the second lens 106. 3 lenses 110 and a presser ring 112 that supports the front side surface 110 </ b> A of the third lens 110.
レンズ枠１００の後端部の外周面には、円筒部６２を連結するための雄ネジ部が設けられている。一方、円筒部６２の先端部は、レンズ枠１００の後端部の外径と略同一の内径を有し、その内周面にはレンズ枠１００の雄ネジ部に対応した雌ネジ部が設けられている。レンズ枠１００の雄ネジ部と円筒部６２の雄ネジ部を螺合させることにより、レンズ枠１００の後端部に円筒部６２が連結される。尚、レンズ枠１００と円筒部６２とはネジ部同士を螺合させた状態で接着剤等による接合手段により接合固定されている。 A male screw portion for connecting the cylindrical portion 62 is provided on the outer peripheral surface of the rear end portion of the lens frame 100. On the other hand, the front end portion of the cylindrical portion 62 has an inner diameter substantially the same as the outer diameter of the rear end portion of the lens frame 100, and a female screw portion corresponding to the male screw portion of the lens frame 100 is provided on the inner peripheral surface thereof. It has been. The cylindrical portion 62 is connected to the rear end portion of the lens frame 100 by screwing the male screw portion of the lens frame 100 and the male screw portion of the cylindrical portion 62. The lens frame 100 and the cylindrical portion 62 are bonded and fixed by a bonding means such as an adhesive in a state where the screw portions are screwed together.
〔前面アクセサリの着脱機構の説明〕
次に、本発明が適用される前面アクセサリの着脱機構について詳しく説明する。ここでは、前面アクセサリとして図１乃至図３に示したワイドコンバータ３０がレンズ鏡胴４の先端に装着される場合を一例に説明するが、ワイドコンバータ３０以外の他の前面アクセサリが装着される場合についても同様である。
[Description of front accessory attachment / detachment mechanism]
Next, the attachment / detachment mechanism of the front accessory to which the present invention is applied will be described in detail. Here, the case where the wide converter 30 shown in FIGS. 1 to 3 is attached to the tip of the lens barrel 4 as an example of the front accessory will be described as an example, but the case where a front accessory other than the wide converter 30 is attached. The same applies to.
図４は、前面アクセサリの着脱機構を説明するための図であり、レンズ鏡胴４の先端部に設けられる鏡胴側装着部４０と、ワイドコンバータ３０の後端部に設けられるアクセサリ側装着部６０とが拡大して示されている。尚、以下の説明においてレンズ鏡胴４の中心軸（光軸）又は前面アクセサリの中心軸から離れる方向を外側方向、その逆を内側方向とし、所定の位置に対して外側方向の位置範囲を外側、外面側、外周側等といい、内側方向の位置範囲を内側、内面側、内周側等というものとする。 FIG. 4 is a view for explaining the attachment / detachment mechanism of the front accessory. The lens barrel side mounting portion 40 provided at the front end portion of the lens barrel 4 and the accessory side mounting portion provided at the rear end portion of the wide converter 30. 60 is enlarged. In the following description, the direction away from the central axis (optical axis) of the lens barrel 4 or the central axis of the front accessory is defined as the outer direction, and the opposite is defined as the inner direction. These are referred to as the outer surface side, the outer peripheral side, etc., and the position range in the inner direction is referred to as the inner side, the inner surface side, the inner peripheral side, etc.
鏡胴側装着部４０は、レンズ鏡胴４の先端部に円筒状に突出形成された円筒部４２と、その外周面上において例えば等間隔の３箇所に同一構造で形成された係合部４４とを有している。同図の係合部４４は複数の係合溝のうちの１つ示す。 The lens barrel side mounting portion 40 includes a cylindrical portion 42 that is formed in a cylindrical shape at the distal end portion of the lens barrel 4 and an engagement portion 44 that is formed with the same structure at, for example, three equally spaced locations on the outer peripheral surface thereof. And have. The engagement portion 44 in the figure shows one of a plurality of engagement grooves.
円筒部４２は、係合部４４が設けられる部分以外において一様な（同一径の）円筒状の面（円筒面）を外周面として有している。以下において、円筒部４２の外周面又は円筒面という場合にはその一様な円筒面を示す。 The cylindrical portion 42 has a uniform (same diameter) cylindrical surface (cylindrical surface) as an outer peripheral surface except for a portion where the engaging portion 44 is provided. Hereinafter, the outer peripheral surface or the cylindrical surface of the cylindrical portion 42 indicates the uniform cylindrical surface.
係合部４４は、図５の斜視図でも示すようにガイド溝４６、係止溝４８、及び、係止突起５０とから構成されている。 As shown in the perspective view of FIG. 5, the engaging portion 44 includes a guide groove 46, a locking groove 48, and a locking protrusion 50.
ガイド溝４６及び係止溝４８は、円筒部４２の外周面上に形成された凹状の溝であり、ガイド溝４６は、円筒部４２の先端面の位置から軸方向（光軸方向）に形成され、係止溝４８は、ガイド溝４６の後端位置から周方向に形成されている。 The guide groove 46 and the locking groove 48 are concave grooves formed on the outer peripheral surface of the cylindrical portion 42, and the guide groove 46 is formed in the axial direction (optical axis direction) from the position of the tip surface of the cylindrical portion 42. The locking groove 48 is formed in the circumferential direction from the rear end position of the guide groove 46.
係止突起５０は、ガイド溝４６と係止溝４８の連結部分において、係止溝４８の底面から外側に突出形成されており、ガイド溝４６側がテーパ面５０Ａで形成されている。尚、係止溝４８から係止突起５０を除いた部分を係止溝４８と称するものとする。 The locking protrusion 50 is formed to protrude outward from the bottom surface of the locking groove 48 at the connecting portion between the guide groove 46 and the locking groove 48, and the guide groove 46 side is formed with a tapered surface 50A. A portion obtained by removing the locking protrusion 50 from the locking groove 48 is referred to as a locking groove 48.
一方、アクセサリ側装着部６０は、前面アクセサリの後端部に後方に突出形成された円筒部６２と、その内周面上において同一構造で形成された複数の凹部６４と、各凹部６４に配置された複数の係止爪６６とを有している。同図の凹部６４及び係止爪６６は複数の凹部及び係止爪のうちの１つを示す。また、同図のアクセサリ側装着部６０における実線は、円筒部６２の内周面上での部材の輪郭を示す。 On the other hand, the accessory-side mounting portion 60 is disposed in the cylindrical portion 62 that protrudes rearward from the rear end portion of the front accessory, a plurality of concave portions 64 that are formed in the same structure on the inner peripheral surface, and the concave portions 64. A plurality of locking claws 66. A recess 64 and a locking claw 66 in the figure indicate one of a plurality of recesses and a locking claw. Moreover, the solid line in the accessory side mounting part 60 of the same figure shows the outline of the member on the inner peripheral surface of the cylindrical part 62.
円筒部６２は、上記鏡胴側装着部４０への装着時に鏡胴側装着部４０の円筒部４２の外周側に嵌合されると共に、その円筒部４２の外周面と略等しい径の内周面を有している。尚、円筒部６２は凹部６４及び係止爪６６が設けられる部分以外において一様な（同一径の）円筒状の面（円筒面）を内周面として有しており、以下において、円筒部４２の内周面又は円筒面という場合にはその一様な円筒面を示す。 The cylindrical portion 62 is fitted to the outer peripheral side of the cylindrical portion 42 of the lens barrel side mounting portion 40 when mounted on the lens barrel side mounting portion 40, and has an inner circumference having a diameter substantially equal to the outer peripheral surface of the cylindrical portion 42. Has a surface. The cylindrical portion 62 has a uniform (same diameter) cylindrical surface (cylindrical surface) as an inner peripheral surface other than the portion where the concave portion 64 and the locking claw 66 are provided. In the case of the inner circumferential surface or cylindrical surface of 42, the uniform cylindrical surface is shown.
凹部６４は、図６の斜視図にも示すように円筒部６２の内周面において外側に凹状に窪む穴であり、上記鏡胴側装着部４０の各係合部４４に対応した位置（係合部４４と同数（例えば３つ）及び同間隔）に形成されている。この凹部６４に係止爪６６が配置されている。 As shown in the perspective view of FIG. 6, the concave portion 64 is a hole that is recessed outward on the inner peripheral surface of the cylindrical portion 62, and a position corresponding to each engaging portion 44 of the lens barrel side mounting portion 40 ( It is formed in the same number (for example, three) and the same interval as the engaging portions 44. A locking claw 66 is disposed in the recess 64.
係止爪６６は、板状体６８と係止突起７０とから形成されている。板状体６８は、円筒部６２の内周面を形成する部材に一体形成されて凹部６４内に突出配置されており、板状体６８の内周側の面が円筒部６２の内周面に沿うような形状及び位置に配置されている。また、板状体６８の外周側の面は、凹部６４の全ての壁面から離間しており、板状体６８は、円筒部６２の部材に連結された一端を基点にして弾性変形可能な状態に支持されている。 The locking claw 66 is formed by a plate-like body 68 and a locking projection 70. The plate-like body 68 is integrally formed with a member that forms the inner peripheral surface of the cylindrical portion 62 and is disposed so as to protrude into the concave portion 64, and the inner peripheral surface of the plate-like body 68 is the inner peripheral surface of the cylindrical portion 62. Is arranged in a shape and position along the line. In addition, the outer peripheral surface of the plate-like body 68 is separated from all the wall surfaces of the concave portion 64, and the plate-like body 68 is in an elastically deformable state based on one end connected to the member of the cylindrical portion 62. It is supported by.
係止突起７０は、板状体６８の内周側の面に突出形成されており、円筒部６２の内周面の位置よりも内側に突出した状態に配置される。係止突起７０の高さ（突出量）は、前面アクセサリの中心軸（光軸）と、レンズ鏡胴４の中心軸（光軸）とを一致させた状態において、鏡胴側装着部４０の円筒部４２の外周面よりも内側の位置に突出する高さに形成されている。係止突起７０の周方向の長さ（幅）は、鏡胴側装着部の係止溝４８と略等しい長さ（幅）に形成されている。尚、鏡胴側装着部４０の係止溝４８の周方向の幅は、少なくとも係止爪６６の係止突起７０よりも大きな幅で形成されている。 The locking protrusion 70 is formed to protrude from the inner peripheral surface of the plate-like body 68 and is disposed in a state protruding inward from the position of the inner peripheral surface of the cylindrical portion 62. The height (protrusion amount) of the locking projection 70 is such that the center axis (optical axis) of the front accessory and the central axis (optical axis) of the lens barrel 4 coincide with each other. It is formed at a height that protrudes to a position inside the outer peripheral surface of the cylindrical portion 42. The length (width) in the circumferential direction of the locking projection 70 is formed to have a length (width) substantially equal to the locking groove 48 of the lens barrel side mounting portion. Note that the circumferential width of the locking groove 48 of the lens barrel side mounting portion 40 is at least larger than the locking protrusion 70 of the locking claw 66.
以上の如く構成された鏡胴側装着部４０とアクセサリ側装着部６０とによる前面アクセサリの着脱機構によれば、以下の操作によって所望の前面アクセサリ（例えばワイドコンバータ３０）をレンズ鏡胴４に装着することができる。まず、操作者は、所定の前面アクセサリの中心軸をレンズ鏡胴４の中心軸に合わせ、前面アクセサリを軸周りに回転させて前面アクセサリのアクセサリ側装着部６０に設けられた複数の係止爪６６の係止突起７０の位置と、レンズ鏡胴４の鏡胴側装着部４０に設けられた複数の係合部４４のガイド溝４６の位置とを合致させる。このとき、アクセサリ側装着部６０の係止爪６６の外側への微小の弾性変形によって、鏡胴側装着部４０の円筒部４２のガイド溝４６に進入できる状態となる。尚、鏡胴側装着部４０の円筒部４２の先端面４２Ａと当接する係止爪６６の係止突起７０と面７０Ａはテーパ面で形成されており、ガイド溝４６に進入しやすいようになっている。 According to the attachment / detachment mechanism of the front accessory by the lens barrel side mounting portion 40 and the accessory side mounting portion 60 configured as described above, a desired front accessory (for example, the wide converter 30) is attached to the lens barrel 4 by the following operation. can do. First, the operator aligns the central axis of a predetermined front accessory with the central axis of the lens barrel 4 and rotates the front accessory around the axis to provide a plurality of locking claws provided on the accessory-side mounting portion 60 of the front accessory. The position of the locking projection 70 of 66 is matched with the position of the guide grooves 46 of the plurality of engaging portions 44 provided on the lens barrel side mounting portion 40 of the lens barrel 4. At this time, it will be in the state which can enter into the guide groove 46 of the cylindrical part 42 of the lens barrel side mounting part 40 by the minute elastic deformation to the outer side of the latching claw 66 of the accessory side mounting part 60. Note that the locking projection 70 and the surface 70A of the locking claw 66 that abuts the distal end surface 42A of the cylindrical portion 42 of the lens barrel side mounting portion 40 are formed with a tapered surface so that they can easily enter the guide groove 46. ing.
続いて、操作者は、前面アクセサリをレンズ鏡胴４側に押し込む。これによって、アクセサリ側装着部６０の係止突起７０が鏡胴側装着部４０のガイド溝４６を進行し、アクセサリ側装着部６０の円筒部６２が鏡胴側装着部４０の円筒部４２の外側に覆い被さる状態に嵌め込まれる。そして、前面アクセサリをレンズ鏡胴４側にそれ以上押し込むことができなくなるまで、即ち、アクセサリ側装着部６０の係止突起７０が、鏡胴側装着部４０のガイド溝４６の後端に到達するまで、前面アクセサリをレンズ鏡胴４側に押し込む。 Subsequently, the operator pushes the front accessory into the lens barrel 4 side. As a result, the locking projection 70 of the accessory side mounting portion 60 advances in the guide groove 46 of the lens barrel side mounting portion 40, and the cylindrical portion 62 of the accessory side mounting portion 60 is outside the cylindrical portion 42 of the lens barrel side mounting portion 40. It is fitted in the state of covering. Then, until the front accessory cannot be pushed further into the lens barrel 4 side, that is, the locking projection 70 of the accessory side mounting portion 60 reaches the rear end of the guide groove 46 of the lens barrel side mounting portion 40. Until the front accessory is pushed into the lens barrel 4 side.
次いで、操作者は、前面アクセサリを前方から見て時計回りに回転可能な位置まで回転させる。このとき、アクセサリ側装着部６０の係止突起７０は、鏡胴側装着部４０の係合部４４のガイド溝４６と係止溝４８の間に設けられた係止突起５０に当接するが、係止爪６６が外側に弾性変形することによって、係止突起５０を乗り越えた後、係止爪６６が元の弾性変形の状態に戻ると共に、係止溝４８に嵌合して係止された状態となる。尚、係止爪６６の係止突起７０が係止突起５０を乗り越える際に当接する係止突起５０の面５０Ａはテーパ面で形成されているため、係止突起７０の回転移動が完全に規制されることなく適度な回転力を加えることによって係止突起５０を乗り越えられるようになっている。 Next, the operator rotates the front accessory to a position where it can rotate clockwise as viewed from the front. At this time, the locking protrusion 70 of the accessory side mounting part 60 abuts on the locking protrusion 50 provided between the guide groove 46 and the locking groove 48 of the engaging part 44 of the lens barrel side mounting part 40. When the latching claw 66 is elastically deformed outward, the latching claw 66 returns to the original elastic deformation state after getting over the latching projection 50 and is fitted into the latching groove 48 and locked. It becomes a state. In addition, since the surface 50A of the locking projection 50 that abuts when the locking projection 70 of the locking claw 66 gets over the locking projection 50 is formed with a tapered surface, the rotational movement of the locking projection 70 is completely restricted. The locking projection 50 can be overcome by applying an appropriate rotational force without being applied.
以上の操作により、鏡胴側装着部４０とアクセサリ側装着部６０とが装着され、前面アクセサリがレンズ鏡胴４の先端部に装着された状態となる。図７は、図３の一部を拡大して示した拡大断面図である。図７に示すように、アクセサリ側装着部６０の円筒部６２は、鏡胴側装着部４０の円筒部４２の外周側を覆う状態に嵌め込まれ、アクセサリ側装着部６０の係止爪６６の係止突起７０が、鏡胴側装着部４０の係止溝４８に係合した状態となる。 With the above operation, the lens barrel side mounting portion 40 and the accessory side mounting portion 60 are mounted, and the front accessory is mounted on the distal end portion of the lens barrel 4. FIG. 7 is an enlarged cross-sectional view showing a part of FIG. 3 in an enlarged manner. As shown in FIG. 7, the cylindrical portion 62 of the accessory side mounting portion 60 is fitted in a state of covering the outer peripheral side of the cylindrical portion 42 of the lens barrel side mounting portion 40, and the engagement claw 66 of the accessory side mounting portion 60 is engaged. The stop projection 70 is engaged with the locking groove 48 of the lens barrel side mounting portion 40.
このとき、鏡胴側装着部４０に対するアクセサリ側装着部６０の前方向（図７中左方向）への移動及びガタは、係止突起７０の前側の面と係止溝４８の前側の面とが当接した状態となることにより規制される。 At this time, the movement and backlash of the accessory-side mounting portion 60 relative to the lens barrel-side mounting portion 40 in the forward direction (leftward in FIG. 7) are caused by the front surface of the locking projection 70 and the front surface of the locking groove 48. Is regulated by being in contact with each other.
また、鏡胴側装着部４０に対するアクセサリ側装着部６０の後方向（図７中右方向）への移動及びガタは、アクセサリ側装着部６０の円筒部６２の後端が、鏡胴側装着部４０の円筒部４２の基端に環状に形成された***部４３に当接した状態となることにより規制される。 Further, the movement and backlash of the accessory side mounting portion 60 relative to the lens barrel side mounting portion 40 in the rearward direction (right direction in FIG. 7) is such that the rear end of the cylindrical portion 62 of the accessory side mounting portion 60 is at the lens barrel side mounting portion. It is regulated by being in contact with a raised portion 43 formed in an annular shape at the base end of 40 cylindrical portions 42.
一方、鏡胴側装着部４０に対するアクセサリ側装着部６０の周方向への回転移動及びガタは、係止爪６６の係止突起７０の周方向の両端面が、図４及び図５に示されている係止溝４８の端部と係止突起５０に当接した状態となることにより規制される。 On the other hand, the circumferential movement and backlash of the accessory side mounting portion 60 relative to the lens barrel side mounting portion 40 are shown in FIG. 4 and FIG. It is regulated by being in contact with the end of the locking groove 48 and the locking projection 50.
従って、鏡胴側装着部４０とアクセサリ側装着部６０とが装着された状態では、レンズ鏡胴４に対して前面アクセサリが規定の位置に固定されると共に、容易には離脱しない状態に固定されるようになる。 Therefore, in a state where the lens barrel side mounting portion 40 and the accessory side mounting portion 60 are mounted, the front accessory is fixed at a predetermined position with respect to the lens barrel 4, and is fixed in a state where it is not easily detached. Become so.
前面アクセサリをレンズ鏡胴４から取り外す場合には、装着時とは逆の手順の操作を行えばよく、前面アクセサリを前方から見て反時計回りに比較的大きな力で回転させて、前面アクセサリの係止突起７０が鏡胴側装着部４０の係止突起５０を乗り越えるようにし、その後、前面アクセサリを前方に引き出せばよい。尚、係止爪６６の係止突起７０が係止溝４８に係止されている状態において係止突起５０に当接している係止突起７０の面７０Ｂはテーパ面で形成されているため、係止突起７０の回転移動が完全に規制されることなく適度な回転力を加えることによって係止突起５０を乗り越えられるようになっている。 When removing the front accessory from the lens barrel 4, it is only necessary to perform the reverse of the procedure for attaching the front accessory. By rotating the front accessory counterclockwise with a relatively large force when viewed from the front, It is only necessary that the locking projection 70 gets over the locking projection 50 of the lens barrel side mounting portion 40, and then the front accessory is pulled forward. In addition, since the surface 70B of the locking projection 70 that is in contact with the locking projection 50 in a state where the locking projection 70 of the locking claw 66 is locked in the locking groove 48 is formed as a tapered surface, The rotation of the locking projection 70 can be overcome the locking projection 50 by applying an appropriate rotational force without being completely restricted.
〔前面アクセサリの着脱機構における衝撃分散構造の説明〕
次に、上記前面アクセサリの着脱機構に設けられる衝撃分散構造について説明する。
[Explanation of shock dispersion structure in front accessory attachment / detachment mechanism]
Next, an impact dispersion structure provided in the front accessory attachment / detachment mechanism will be described.
図３に示したワイドコンバータ３０のように、金属製のレンズ枠１００と樹脂製の円筒部６２とからなる２ピース構造を有する前面アクセサリでは、レンズフードと比較して先端部の重量が大きく、円筒部６２を構成する樹脂は金属に比べて剛性及び寸法精度が低い。このため、上記の着脱機構のみでレンズ鏡胴４に装着した場合には、鏡胴側装着部４０に対してアクセサリ側装着部６０の円筒部６２だけで力を受けているため、前面アクセサリの着脱機構に径方向の外力Ｆ（図７参照）が加えられると、外力Ｆによる衝撃が分散されずに、アクセサリ側装着部６０の円筒部６２に集中し、該円筒部６２が変形してしまい、前面アクセサリとレンズ鏡胴４との間にガタが発生しやすく、前面アクセサリとレンズ鏡胴４との光軸に位置ずれが生じ、フォーカス精度の低下を招いてしまう。最悪の場合には、レンズ鏡胴４から脱落して前面アクセサリを破損してしまう恐れがある。 As in the wide converter 30 shown in FIG. 3, the front accessory having a two-piece structure composed of the metal lens frame 100 and the resin cylindrical portion 62 has a large weight at the tip compared to the lens hood, The resin constituting the cylindrical portion 62 has lower rigidity and dimensional accuracy than metal. For this reason, when the lens barrel 4 is mounted only by the above-described attachment / detachment mechanism, the force is received only by the cylindrical portion 62 of the accessory side mounting portion 60 with respect to the lens barrel side mounting portion 40. When a radial external force F (see FIG. 7) is applied to the attachment / detachment mechanism, the impact due to the external force F is not dispersed but concentrated on the cylindrical portion 62 of the accessory side mounting portion 60, and the cylindrical portion 62 is deformed. In addition, backlash is likely to occur between the front accessory and the lens barrel 4, and the optical axis between the front accessory and the lens barrel 4 is displaced, resulting in a decrease in focus accuracy. In the worst case, there is a risk that the front accessory may be damaged by dropping from the lens barrel 4.
そこで本実施形態では、前面アクセサリの着脱機構に加えられた衝撃を分散させるための構造（衝撃分散構造）が設けられている。 Therefore, in this embodiment, a structure (impact dispersion structure) for dispersing the impact applied to the attachment / detachment mechanism of the front accessory is provided.
具体的には、図７に示すように、金属製のレンズ枠１００の内周面における後端部（鏡胴側装着部４０の円筒部４２とのオーバーラップ領域に対応する位置）に周方向全体にわたって内側に突出する円環状の突出部１２０が設けられている。この突出部１２０は衝撃分散構造の構成要素であり、アクセサリ側装着部６０の円筒部６２の内周面よりも内側に僅かに突出して形成される。 Specifically, as shown in FIG. 7, the circumferential direction is the rear end portion (the position corresponding to the overlap region with the cylindrical portion 42 of the lens barrel side mounting portion 40) on the inner peripheral surface of the metal lens frame 100. An annular projecting portion 120 that projects inward throughout is provided. The protrusion 120 is a component of the impact dispersion structure, and is formed to slightly protrude inward from the inner peripheral surface of the cylindrical portion 62 of the accessory side mounting portion 60.
突出部１２０は、レンズ枠１００と一体的に形成された金属部材で構成されており、外力Ｆが加えられていない場合には、突出部１２０の先端面と鏡胴側装着部４０の円筒部４２の外周面との間に僅かなクリアランスが高精度に設けられている。尚、前記クリアランスは、アクセサリ側装着部６０の円筒部６２の内周面と鏡胴側装着部４０の円筒部４２の外周面とのクリアランスより狭くなっている。 The protruding portion 120 is made of a metal member formed integrally with the lens frame 100. When no external force F is applied, the protruding portion 120 and the cylindrical portion of the lens barrel side mounting portion 40 are provided. A slight clearance is provided with high accuracy between the outer peripheral surface of 42. The clearance is narrower than the clearance between the inner peripheral surface of the cylindrical portion 62 of the accessory side mounting portion 60 and the outer peripheral surface of the cylindrical portion 42 of the lens barrel side mounting portion 40.
かかる構成により、図７に示すような径方向の外力Ｆが加えられると、鏡胴側装着部４０の円筒部４２の外周面にレンズ枠１００の後端部に形成される突出部１２０が当接する。これにより、アクセサリ側装着部６０の円筒部６２の変形が防止されるとともに、外力Ｆによる衝撃が突出部１２０を通じてレンズ鏡胴４に分散され、突出部１２０が設けられない場合に比べて前面アクセサリとレンズ鏡胴４との間に発生するガタが抑えられ、前面アクセサリとレンズ鏡胴４との光軸の位置ずれを防止することができる。その結果、高精度のフォーカス動作が可能となる。また、前面アクセサリの脱落も防止することができる。 With such a configuration, when a radial external force F as shown in FIG. 7 is applied, the protrusion 120 formed at the rear end of the lens frame 100 is applied to the outer peripheral surface of the cylindrical portion 42 of the lens barrel side mounting portion 40. Touch. Thereby, the deformation of the cylindrical portion 62 of the accessory side mounting portion 60 is prevented, and the impact due to the external force F is distributed to the lens barrel 4 through the protruding portion 120, and compared to the case where the protruding portion 120 is not provided. And the lens barrel 4 can be prevented from being loosened, and the positional deviation of the optical axis between the front accessory and the lens barrel 4 can be prevented. As a result, a highly accurate focus operation is possible. In addition, the front accessory can be prevented from falling off.
尚、本実施形態では、レンズ枠１００の内周面の周方向全体にわたって突出部１２０が設けられる態様が好ましく採用されるが、これに限らず、複数の突出部１２０が周方向に沿って所定間隔をあけて等間隔に形成されていてもよい。 In the present embodiment, a mode in which the protruding portions 120 are provided over the entire circumferential direction of the inner peripheral surface of the lens frame 100 is preferably employed, but the present invention is not limited thereto, and a plurality of protruding portions 120 are predetermined along the circumferential direction. It may be formed at equal intervals with an interval.
以上、本発明に係るレンズ装置のアクセサリ着脱機構について詳細に説明したが、本発明は、以上の例には限定されず、本発明の要旨を逸脱しない範囲において、各種の改良や変形を行ってもよいのはもちろんである。 As mentioned above, although the accessory attachment / detachment mechanism of the lens apparatus according to the present invention has been described in detail, the present invention is not limited to the above examples, and various improvements and modifications are made without departing from the gist of the present invention. Of course it is also good.
２…撮影レンズ、４…レンズ鏡胴、３０…ワイドコンバータ、４０…鏡胴側装着部、４２…円筒部、４４…係合部、６０…アクセサリ側装着部、６２…円筒部、６６…係止爪、１００…レンズ枠、１２０…突出部 DESCRIPTION OF SYMBOLS 2 ... Shooting lens, 4 ... Lens barrel, 30 ... Wide converter, 40 ... Lens barrel side mounting part, 42 ... Cylindrical part, 44 ... Engagement part, 60 ... Accessory side mounting part, 62 ... Cylindrical part, 66 ... Associate Stopper, 100 ... Lens frame, 120 ... Projection
Claims (3)
前記レンズ鏡胴の先端部には円筒状に突出形成された鏡胴側装着部が設けられ、該鏡胴側装着部の外周面には複数の係合部が周方向に沿って等間隔で形成され、
前記アクセサリ部品の後端部には円筒状に突出形成されたアクセサリ側装着部が設けられ、該アクセサリ側装着部の内周面には前記複数の係合部にそれぞれ対応する位置に複数の係止爪が周方向に沿って等間隔で形成され、
前記アクセサリ側装着部の内側に前記鏡胴側装着部が挿入された状態で前記複数の係止爪がそれぞれ対応する前記複数の係合部に係止することにより、前記レンズ鏡胴の先端部に前記アクセサリ部品が装着されるレンズ装置のアクセサリ着脱機構であって、
前記アクセサリ部品は、１又は複数のレンズが保持される金属製のレンズ枠と、該レンズ枠の後端部に連結固定される樹脂製の円筒部と、を備えた補助レンズであり、
前記アクセサリ側装着部の内周面には周方向に沿って内側に向けて突出する突出部が前記レンズ枠と一体的に設けられ、該突出部は、前記アクセサリ側装着部に径方向の外力が作用した場合に前記鏡胴側装着部の外周面に当接するように構成されることを特徴とするレンズ装置のアクセサリ着脱機構。 In the accessory attachment / detachment mechanism of the lens apparatus in which the accessory part is configured to be detachable at the tip of the lens barrel,
The lens barrel is provided with a lens barrel-side mounting portion projecting in a cylindrical shape at the tip of the lens barrel, and a plurality of engagement portions are arranged at equal intervals along the circumferential direction on the outer peripheral surface of the lens barrel-side mounting portion. Formed,
An accessory side mounting portion that is formed in a cylindrical shape is provided at the rear end portion of the accessory part, and a plurality of engagement portions are provided on the inner peripheral surface of the accessory side mounting portion at positions corresponding to the plurality of engagement portions, respectively. Toe pawls are formed at equal intervals along the circumferential direction,
When the lens barrel side mounting portion is inserted inside the accessory side mounting portion, the plurality of locking claws are respectively locked to the corresponding engaging portions, whereby the tip end portion of the lens barrel An accessory attaching / detaching mechanism of the lens device to which the accessory part is attached,
The accessory part is an auxiliary lens provided with a metal lens frame that holds one or more lenses, and a resin cylindrical portion that is connected and fixed to the rear end of the lens frame,
A protrusion that protrudes inward along the circumferential direction is provided integrally with the lens frame on the inner peripheral surface of the accessory-side mounting portion, and the protrusion has a radial external force applied to the accessory-side mounting portion. An accessory attaching / detaching mechanism for a lens apparatus, wherein the lens apparatus is configured to abut against an outer peripheral surface of the lens barrel side mounting portion when the lens acts.
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