JP3699698B2

JP3699698B2 - Camera lens attachment attachment / detachment mechanism

Info

Publication number: JP3699698B2
Application number: JP2002274239A
Authority: JP
Inventors: 和廣佐藤
Original assignee: マルミ光機株式会社
Priority date: 2002-09-20
Filing date: 2002-09-20
Publication date: 2005-09-28
Anticipated expiration: 2022-09-20
Also published as: JP2004109717A

Description

【０００１】
【発明の属する分野】
本発明はカメラのレンズアタッチメント着脱機構に関する。
本発明のカメラ等に於けるレンズアタッチメント着脱機構は、例えば、カメラの撮影レンズ前面に装着するレンズ表面の保護用フィルターや紫外線カット用フィルター、モノクロ用フィルター等、フィルターを撮影レンズ前面に装着するための着脱機構で、カメラのレンズ鏡筒最前部にフィルターを装着、または取り外しの際、該操作がワンタッチで行える着脱機構を提供するものである。
【０００２】
【従来の技術】
カメラの撮影用レンズ鏡筒の最前部内径側には通常、フィルターやフードなど撮影用レンズのアタッチメントを装着するために雌ネジが螺設されており、他方装着されるフィルターやフードなどのアタッチメント側には雄ネジが螺設されており、フィルターやフードフードのアタッチメントをそのネジ部による螺合により着脱している。
【０００３】
而して前記アタッチメントをネジ部により螺合する着脱機構は、フィルターの場合を例にすると次の欠点がある。即ち、カメラの撮影用レンズ鏡筒の最前部に螺設された雌ネジにフィルターの雄ネジを螺着する初めの嵌合操作は、意外と手間取るものであり、独特の勘と操作慣れが必要であり、且つ、ネジ部のネジピッチが細かいため装着するフィルターを何回も回転させて、所定位置に装着する必要がある。
【０００４】
従って初めの雄ネジと雌ネジの嵌合操作を誤ると撮影用レンズとフィルターのネジ山を壊してしまうこともあり、また螺合操作であるため、所定位置での螺着の加減を間違えるとネジ部が圧着されてしまい取り外しに苦労する不都合な着脱機構であった。
【０００５】
【発明が解決しようとする課題】
本発明は、従来のカメラのフィルター着脱機構が上述の欠点を有し大きな問題点であったことに鑑みてなされたものであって、本発明に係るフィルター着脱機構は撮影現場に於いて、ワンタッチで簡単、且つ容易に着脱が可能であり、従ってフィルターの交換も素速く行えて、シャッターチャンスにも存分に対応できるフィルターの着脱機構を提供することを目的とする。
【０００６】
また、本発明のフィルター着脱機構は、撮影用レンズ鏡筒の最前部内径側に通常的に螺設されたアタッチメント装着用の雌ネジ部に装着されるものであって、本発明のフィルターを装着するために特別なアダプターを特に必要としないので、フィルターのみならず、該フィルターと同一部位に装着されるフードやキャップ等、他のカメラのレンズアタッチメント着脱機構としても十分に利用できる。
【０００７】
【課題を解決するための手段】
本発明は上記の目的を達成するために、フィルターを挟持したフィルター外枠と一体化して形成された挿着部を設け、該挿着部はカメラの撮影用レンズ鏡筒の最前部内径側雌ネジ部に挿着可能な外径を持ち、該挿着部の外周部を３等分或いは４等分する位置に内蔵するスプリングに押圧され挿着部の外周部側に突出しているボールベアリングからなる係合部を設け、前記フィルターの挿着部がカメラの撮影用レンズ鏡筒の最前部内径側雌ネジ部に挿着されたときボールベアリングからなる係合部が内径側雌ネジ部に係着してフィルターが撮影用レンズ鏡筒最前部に装着され、該フィルターの取り外しは前記係合部を形成する３点或いは４点のボールベアリング押圧力に対向した力で抜脱するよう構成することにより、フィルターをカメラの撮影用レンズ鏡筒の最前部にワンタッチで着脱自在に装着可能にしたものである。
【０００８】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて具体的に説明する。
図１はカメラの撮影用レンズ鏡筒の最前部に本発明のレンズアタッチメント着脱機構を具備したフィルターを装着した例を示す要部断面図、図２はフィルターの正面図、図３は図２のA−A要部断面図、図４は図３のＢ−Ｂ部拡大図をそれぞれ示している。
【０００９】
図１乃至図４において、１はカメラの撮影用レンズ鏡筒、２は該レンズ鏡筒の最前部、３はレンズ鏡筒の最前部に螺設されたレンズアタッチメント装着用の雌ネジ部である。
【００１０】
前記雌ネジ部３にはフィルター４を挟持したフィルター外枠５と一体化されて形成された挿着部６が設けられており、該挿着部６はカメラの撮影用レンズ鏡筒１の最前部２の内径側雌ネジ部３に挿着可能な外径を有し、該挿着部６の外周部７には外周を３等分（４等分でもよい）する位置にそれぞれボールベアリング８a、８ｂ、８ｃが外周側に突出して設けられている（４等分の場合は４カ所にボールベアリングが設けられている）。
【００１１】
該ボールベアリング８ａ、８ｂ、８ｃは、前記挿着部６の外周部７に前記間隔をもって穿たれた丸孔９ａ、９ｂ、９ｃに規制枠１０ａ、１０ｂ、１０ｃ（図４にて示す）を介して嵌着されており、ボールベアリング８ａ、８ｂ、８ｃは内蔵されたスプリング１１ａ、１１ｂ、１１ｃにて常に挿着部６の外周側に押圧されている係合部１２ａ、１２ｂ、１２ｃを形成している。
【００１２】
而して、前記ボールベアリング８ａ、８ｂ、８ｃ等からなる係合部１２ａ、１２ｂ、１２ｃはフィルター４の挿着部６がカメラの撮影用レンズ鏡筒２の最前部２の内径雌ネジ部３に挿着するときは、該係合部１２ａ、１２ｂ、１２ｃのボールベアリング８ａ、８ｂ、８ｃがレンズ鏡筒２の内径雌ネジ部３端部に突き当たりボールベアリング８ａ、８ｂ、８ｃがそれぞれスプリング１１ａ、１１ｂ、１１ｃを圧縮して規制枠１０ａ、１０ｂ、１０ｃ内に埋没し、該埋没した分の反発力にて内径ネジ部３内に係着してフィルター４をレンズ鏡筒１の最前部２に装着できる（図１に示す）。そして該装着操作はワンタッチの嵌合操作となる。
【００１３】
また、前記装着されたフィルター４の取り外しは、フィルター４の外枠５を抜脱することでワンタッチで、簡単、且つ容易に行える。
【００１４】
而して、本発明は他の実施様態として、カメラレンズの他のアタッチメントであるフードの着脱機構や、レンズキャップの着脱機構として実施しても有効であり、図５はその一例としてレンズフードの実施例に基づき説明する。
【００１５】
図５において、１３はフード本体、６は該フード本体１３と一体化して設けられた挿着部、７は挿着部６に設けられた外周部であり、該外周部７の円周を３等分（４等分でもよい）する位置にそれぞれボールベアリング８ａ、８ｂ、８ｃが外周側に突出して設けられている（４等分の場合には４カ所にボールベアリングが設けられている）。
【００１６】
該ボールベアリング８ａ、８ｂ、８ｃは、図４と同様に前記挿着部６の外周部７に前記間隔をもって穿たれた丸孔９ａ、９ｂ、９ｃに規制枠１０ａ、１０ｂ、１０ｃを介して嵌着されており、ボールベアリング８ａ、８ｂ、８ｃは内蔵されたスプリング１１ａ、１１ｂ、１１ｃにて常に挿着部６の外周側に押圧されている係合部１２ａ、１２ｂ、１２ｃを形成している。
【００１７】
斯くして、図５の実施様態はレンズ鏡筒１の最前部２にレンズアタッチメントのフード１３を装着した例を示し、その作用は図１乃至図４にて説明した実施様態と同様となり、該フード１３の着脱はワンタッチでおこなえる。
また、上述の着脱機構は、レンズキャップの着脱機構としても利用できその利用範囲は、幅の広いものである。
【００１８】
【発明の効果】
而して、本発明は従来の着脱機構が、雌ネジと雄ネジの螺合による装着操作で、雌ネジと雄ネジの初めの螺合操作が、意外と手間取るものであり、独特の勘と操作慣れが必要で、該初めの螺合操作を誤ると撮影用レンズとアタッチメントのネジ山を壊してしまうおそれがあったものを解消した。
【００１９】
また、従来の着脱機構が、ネジ部による螺着で、該ネジ部のネジピッチが細かいため装着するレンズアタッチメントを何回も回転させて所定位置に装着したり、所定位置での螺着の加減を間違えるとネジ部が圧着されてしまい取り外しに苦労したりするようなことも、なくすことができた。
【００２０】
そして、本発明に係る技術によれば、撮影現場にあっても、ワンタッチで簡単、且つ容易にレンズアタッチメントを着脱可能なカメラのレンズアタッチメント着脱機構を提供することができるのであって、その実施の効果は顕著と云える。
【図面の簡単な説明】
【図１】カメラレンズに本発明の着脱機構を具備したフィルターを装着した例を示す要部切欠断面図である。
【図２】フィルターの正面図である。
【図３】図２のA−A要部断面図である。
【図４】図３のＢ−Ｂ部拡大説明図である。
【図５】他の実施例を示す説明図である。
【符号の説明】
１カメラの撮影用レンズ鏡筒
２レンズ鏡筒の最前部
３雌ネジ部
４フィルター
５フィルター外枠
６挿着部
７外周部
８a、８ｂ、８ｃ、ボールベアリング
９a、９ｂ、９ｃ、丸孔
１０a、１０ｂ、１０ｃ、規制枠
１１a、１１ｂ、１１ｃ、スプリング
１２a、１２ｂ、１２ｃ、係合部
１３フード[0001]
[Field of the Invention]
The present invention relates to a lens attachment / detachment mechanism for a camera.
The lens attachment attachment / detachment mechanism in the camera or the like of the present invention is for attaching a filter to the front surface of the photographing lens, such as a protective filter for the lens surface attached to the front surface of the photographing lens of the camera, an ultraviolet cut filter, a monochrome filter or the like. This attachment / detachment mechanism provides an attachment / detachment mechanism in which the operation can be performed with one touch when a filter is attached to or removed from the foremost lens barrel of the camera.
[0002]
[Prior art]
The inner diameter of the front lens barrel of the camera is usually threaded with a female screw to attach the attachment of the photographic lens, such as a filter or hood, and the other attachment side of the filter or hood to be attached A male screw is screwed, and the attachment of the filter and the hood hood is attached and detached by screwing with the screw part.
[0003]
Thus, the attachment / detachment mechanism for screwing the attachment with the screw portion has the following drawbacks when the filter is taken as an example. In other words, the initial fitting operation of screwing the filter male screw into the female screw screwed at the forefront of the camera lens barrel is surprisingly troublesome and requires a unique intuition and operational familiarity. In addition, since the thread pitch of the thread portion is fine, it is necessary to rotate the filter to be mounted many times to mount it at a predetermined position.
[0004]
Therefore, if the fitting operation of the first male screw and female screw is mistaken, the photographing lens and the thread of the filter may be broken, and it is a screwing operation. This is an inconvenient attachment / detachment mechanism in which the screw part is crimped and the removal is difficult.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the fact that the conventional filter attaching / detaching mechanism of the camera has the above-mentioned drawbacks and has been a big problem. The filter attaching / detaching mechanism according to the present invention is one-touch at the photographing site. It is an object of the present invention to provide a filter attaching / detaching mechanism that can be easily and easily attached and detached, and therefore can be replaced quickly, and can fully cope with a photo opportunity.
[0006]
Further, the filter attaching / detaching mechanism of the present invention is attached to a female thread portion for attachment mounting usually screwed on the foremost inner diameter side of the photographing lens barrel, and is equipped with the filter of the present invention. Therefore, a special adapter is not particularly required, so that it can be used not only as a filter but also as a lens attachment attachment / detachment mechanism for other cameras such as a hood and a cap attached to the same part as the filter.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an insertion portion formed integrally with a filter outer frame sandwiching a filter, and the insertion portion is a frontmost inner diameter side female of a photographing lens barrel of a camera. From a ball bearing that has an outer diameter that can be inserted into the screw portion and is pressed by a spring built in a position that divides the outer periphery of the insertion portion into three or four equal parts and protrudes toward the outer periphery of the insertion portion When the filter insertion part is inserted into the foremost inner diameter female thread part of the photographing lens barrel of the camera, the engagement part consisting of a ball bearing is engaged with the inner diameter internal thread part. The filter is attached to the foremost part of the lens barrel for photographing, and the filter is removed by a force opposed to the ball bearing pressing force at three or four points that form the engaging portion. To filter the camera The front of the use the lens barrel is obtained by the detachably mounted with one touch.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of an essential part showing an example in which a filter equipped with a lens attachment attaching / detaching mechanism of the present invention is attached to the foremost part of a photographing lens barrel of a camera, FIG. 2 is a front view of the filter, and FIG. AA main part sectional drawing, FIG. 4 has each shown the BB part enlarged view of FIG.
[0009]
1 to 4, reference numeral 1 denotes a camera lens barrel, 2 denotes a foremost portion of the lens barrel, and 3 denotes a female thread portion for mounting a lens attachment screwed to the foremost portion of the lens barrel. .
[0010]
The female screw portion 3 is provided with an insertion portion 6 formed integrally with a filter outer frame 5 sandwiching a filter 4, and the insertion portion 6 is provided at the forefront of the photographing lens barrel 1 of the camera. The outer peripheral portion 7 of the insertion portion 6 has an outer diameter that can be inserted into the inner diameter side female screw portion 3 of the portion 2, and each of the ball bearings 8a at a position that divides the outer periphery into three equal parts (or four equal parts). , 8b, 8c are provided so as to protrude to the outer peripheral side (in the case of four equal parts, ball bearings are provided at four locations).
[0011]
The ball bearings 8a, 8b, and 8c are connected to round holes 9a, 9b, and 9c, which are formed in the outer peripheral portion 7 of the insertion portion 6 at the intervals, through restriction frames 10a, 10b, and 10c (shown in FIG. 4). The ball bearings 8a, 8b, and 8c form engagement portions 12a, 12b, and 12c that are always pressed to the outer peripheral side of the insertion portion 6 by built-in springs 11a, 11b, and 11c. ing.
[0012]
Thus, in the engaging portions 12a, 12b, 12c made of the ball bearings 8a, 8b, 8c, etc., the insertion portion 6 of the filter 4 is the inner diameter female screw portion 3 of the foremost portion 2 of the photographing lens barrel 2 of the camera. When the ball bearings 8a, 8b, and 8c are inserted into the lens barrel 2, the ball bearings 8a, 8b, and 8c abut against the end of the inner diameter female screw portion 3 of the lens barrel 2, and the ball bearings 8a, 8b, and 8c are respectively springs 11a. , 11b, 11c are compressed and embedded in the regulation frames 10a, 10b, 10c, and the filter 4 is attached to the innermost threaded portion 3 by the repulsive force of the embedded portion, and the filter 4 is attached to the frontmost portion 2 of the lens barrel 1. (Shown in FIG. 1). The mounting operation is a one-touch fitting operation.
[0013]
The attached filter 4 can be easily and easily removed with one touch by removing the outer frame 5 of the filter 4.
[0014]
Thus, the present invention is effective as another embodiment of the present invention even when implemented as an attachment / detachment mechanism of a hood, which is another attachment of a camera lens, or an attachment / detachment mechanism of a lens cap. FIG. This will be described based on examples.
[0015]
In FIG. 5, reference numeral 13 denotes a hood main body, 6 denotes an insertion portion provided integrally with the hood main body 13, and 7 denotes an outer peripheral portion provided in the insertion portion 6, and the circumference of the outer peripheral portion 7 is 3 Ball bearings 8a, 8b, and 8c are provided so as to protrude to the outer peripheral side at positions equally divided (may be divided into four equal parts) (in the case of four equal parts, ball bearings are provided at four locations).
[0016]
The ball bearings 8a, 8b, and 8c are fitted into the round holes 9a, 9b, and 9c, which are formed in the outer peripheral portion 7 of the insertion portion 6 with the gap, through the restriction frames 10a, 10b, and 10c, as in FIG. The ball bearings 8a, 8b, and 8c form engagement portions 12a, 12b, and 12c that are always pressed to the outer peripheral side of the insertion portion 6 by built-in springs 11a, 11b, and 11c. .
[0017]
Thus, the embodiment of FIG. 5 shows an example in which the lens attachment hood 13 is attached to the foremost portion 2 of the lens barrel 1, and the operation thereof is the same as that of the embodiment described in FIGS. The hood 13 can be attached and detached with one touch.
Moreover, the above-mentioned attachment / detachment mechanism can be used as an attachment / detachment mechanism for the lens cap, and its use range is wide.
[0018]
【The invention's effect】
Thus, according to the present invention, the conventional attaching / detaching mechanism is a mounting operation by screwing of the female screw and the male screw, and the first screwing operation of the female screw and the male screw is surprisingly troublesome. Familiarity is required, and if the initial screwing operation was mistaken, there was a possibility that the thread of the photographing lens and attachment could be broken.
[0019]
In addition, the conventional attachment / detachment mechanism is screwed by a screw part, and since the screw pitch of the screw part is fine, the lens attachment to be attached is rotated many times to be attached at a predetermined position, and screwing at a predetermined position is adjusted. If you make a mistake, you can eliminate the problem of screwing the screw part and making it difficult to remove it.
[0020]
According to the technology of the present invention, it is possible to provide a lens attachment attachment / detachment mechanism for a camera that can be attached and detached easily and easily with a single touch even at a shooting site. The effect can be said to be remarkable.
[Brief description of the drawings]
FIG. 1 is a cutaway cross-sectional view of an essential part showing an example in which a filter equipped with an attachment / detachment mechanism of the present invention is attached to a camera lens.
FIG. 2 is a front view of a filter.
3 is a cross-sectional view of the main part AA in FIG. 2;
4 is an enlarged explanatory view of a BB part in FIG. 3;
FIG. 5 is an explanatory diagram showing another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Camera lens barrel 2 Front lens part 3 Female thread part 4 Filter 5 Filter outer frame 6 Insertion part 7 Outer peripheral part 8a, 8b, 8c, Ball bearing 9a, 9b, 9c, Round hole 10a, 10b, 10c, restriction frames 11a, 11b, 11c, springs 12a, 12b, 12c, engaging portion 13 hood

Claims

Provide an insertion part formed integrally with the filter outer frame sandwiching the filter,
The insertion portion has an outer diameter that can be inserted into a female screw portion that is screwed to the foremost inner diameter side of the photographing lens barrel of the camera,
An engaging portion comprising a ball bearing that is pressed by a spring built in a position that divides the outer peripheral portion of the insertion portion into three or four equal parts and protrudes toward the outer peripheral side of the insertion portion;
When the insertion portion of the filter is inserted into the foremost inner diameter side of the photographing lens barrel of the camera, an engagement portion composed of a ball bearing is engaged in the female screw portion screwed on the inner diameter side. Is attached to the forefront of the lens barrel,
The removal of the filter is performed by removing it with a force opposite to the ball bearing pressing force at three or four points forming the engaging portion.
A lens attachment / detachment mechanism for cameras.

An insertion part formed integrally with the camera lens attachment body with the lens hood function and lens cap function is provided on the front,
The insertion portion has an outer diameter that can be inserted into a female screw portion screwed on the foremost inner diameter side of the photographing lens barrel of the camera,
An engagement portion comprising a ball bearing that is pressed by a spring built in a position that divides the outer periphery of the insertion portion into three or four equal parts and protrudes toward the outer periphery of the insertion portion;
When the insertion portion of the camera lens attachment main body is inserted into the foremost inner diameter side of the lens barrel, an engagement portion made of a ball bearing provided in the insertion portion of the attachment main body is screwed inside the frontmost portion. It was configured to be attached to the foremost part of the lens barrel by being engaged in the female screw part ,
The lens attachment / detachment mechanism for a camera according to claim 1.