JPH10319474A - Polarizing filter - Google Patents
Polarizing filterInfo
- Publication number
- JPH10319474A JPH10319474A JP13058297A JP13058297A JPH10319474A JP H10319474 A JPH10319474 A JP H10319474A JP 13058297 A JP13058297 A JP 13058297A JP 13058297 A JP13058297 A JP 13058297A JP H10319474 A JPH10319474 A JP H10319474A
- Authority
- JP
- Japan
- Prior art keywords
- polarizing plate
- frame
- holding frame
- filter
- plate holding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Lens Barrels (AREA)
- Blocking Light For Cameras (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は偏光フィルタに係
り、特にレンズ鏡筒先端に取り付けて使用される偏光フ
ィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing filter, and more particularly to a polarizing filter used by being attached to the tip of a lens barrel.
【０００２】[0002]
【従来の技術】写真撮影の際に偏光フィルタを使用する
と便利なことはよく知られている。例えば、室内にいる
人物等をガラス越しに撮影する場合に偏光フィルタを用
いると、ガラス表面での反射光を除去することができ、
室内の人物等をはっきりと撮影することができる。BACKGROUND OF THE INVENTION It is well known that it is convenient to use a polarizing filter when taking a picture. For example, when using a polarizing filter when shooting a person or the like in a room through glass, reflected light on the glass surface can be removed,
A person or the like in the room can be clearly photographed.
【０００３】図４は従来技術による偏光フィルタの縦断
面図である。図に示すように、偏光フィルタ１は偏光板
２を有し、この偏光板２の周縁部に円環状の偏光板保持
枠３が設けられている。偏光板保持枠３には段付部３Ａ
が設けられ、この段付部３Ａに偏光板２の周縁部が係合
している。また偏光板２を挟んで段付部３Ａの反対側に
は円環状の偏光板押え環４が設けられている。偏光板押
え環４と偏光板保持枠３とはネジで結合され、このネジ
を締め付けることにより、偏光板２は、その周縁部が偏
光板押え環４と段部３Ａとで挟持されて、偏光板保持枠
３の内側に保持されている。FIG. 4 is a longitudinal sectional view of a conventional polarizing filter. As shown in FIG. 1, the polarizing filter 1 has a polarizing plate 2, and an annular polarizing plate holding frame 3 is provided on the periphery of the polarizing plate 2. Step 3A on the polarizing plate holding frame 3
The peripheral edge of the polarizing plate 2 is engaged with the stepped portion 3A. On the opposite side of the stepped portion 3A with the polarizing plate 2 interposed therebetween, an annular polarizing plate holding ring 4 is provided. The polarizing plate holding ring 4 and the polarizing plate holding frame 3 are joined by screws, and by tightening the screws, the peripheral edge of the polarizing plate 2 is sandwiched between the polarizing plate holding ring 4 and the step 3A, and the polarized light is polarized. It is held inside the plate holding frame 3.
【０００４】偏光板保持枠３のレンズ鏡筒側（図の右
側）には円環状のフィルタ取付部５が設けられている。
このフィルタ取付部５は偏光板保持枠３の外周に固定さ
れており、偏光板保持枠３と一体的となっている。ま
た、フィルタ取付部５にはネジ５Ａが形成され、このネ
ジ５Ａはレンズ鏡筒先端のフィルタ枠６のネジ６Ａに螺
合している。このように偏光フィルタ１はレンズ鏡筒先
端に着脱自在に取り付けられている。An annular filter mounting portion 5 is provided on the lens barrel side (right side in the figure) of the polarizing plate holding frame 3.
The filter mounting portion 5 is fixed to the outer periphery of the polarizing plate holding frame 3 and is integrated with the polarizing plate holding frame 3. A screw 5A is formed in the filter mounting portion 5, and the screw 5A is screwed into a screw 6A of the filter frame 6 at the tip of the lens barrel. Thus, the polarizing filter 1 is detachably attached to the tip of the lens barrel.
【０００５】[0005]
【発明が解決しようとする課題】ところで、一般にレン
ズ鏡筒には距離操作環が設けられ、この距離操作環を光
軸回りに回転させることにより、内部のレンズ群が光軸
方向に移動してピント調整を行うことができるようにな
っている。Generally, the lens barrel is provided with a distance control ring. By rotating the distance control ring about the optical axis, the internal lens group moves in the optical axis direction. Focus adjustment can be performed.
【０００６】しかしながら、上記従来の技術ではフィル
タ取付部が偏光板保持枠の外周に固定されているので、
距離操作環を光軸回りに回転させてピント調整を行った
ときに、フィルタ取付部及び偏光板保持枠と共に偏光板
も回転してしまうという欠点がある。その結果、従来の
偏光フィルタでは、同一被写体でも撮影距離が変化する
度に偏光板の向きを合わせ直さなければならず、非常に
煩わしい。However, in the above-mentioned conventional technique, the filter mounting portion is fixed to the outer periphery of the polarizing plate holding frame.
When the focus adjustment is performed by rotating the distance operation ring around the optical axis, there is a disadvantage that the polarizing plate rotates together with the filter mounting portion and the polarizing plate holding frame. As a result, in the conventional polarizing filter, the direction of the polarizing plate must be re-aligned each time the shooting distance changes even for the same subject, which is very troublesome.
【０００７】本発明の目的は、偏光板の向きを一度適正
な状態に設定しておけば、ピント調整を行う度に偏光板
の向きを合わせ直す必要のない偏光フィルタを提供する
ことにある。An object of the present invention is to provide a polarizing filter which does not need to be realigned every time focus adjustment is performed once the direction of the polarizing plate is set to an appropriate state.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、請求項１に記載の発明は、偏光板と、該偏光板を保
持する円環状の偏光板保持枠と、該偏光板保持枠をレン
ズ鏡筒先端のフィルタ枠に取り付けるための円環状のフ
ィルタ取付部とを備えた偏光フィルタにおいて、前記偏
光板保持枠を前記フィルタ取付部に回転自在に取り付け
るとともに、前記偏光板保持枠外周の任意の位置に錘を
固定する固定手段を設けたことを特徴としている。In order to achieve the above object, according to the first aspect of the present invention, a polarizing plate, an annular polarizing plate holding frame for holding the polarizing plate, and a polarizing plate holding frame are provided. And an annular filter mounting portion for mounting the filter plate at the tip of the lens barrel, wherein the polarizing plate holding frame is rotatably mounted on the filter mounting portion, and the outer periphery of the polarizing plate holding frame. It is characterized in that fixing means for fixing the weight at an arbitrary position are provided.
【０００９】上記構成によれば、偏光板の向きが適正に
なるように偏光板保持枠を回転させ、その状態で固定手
段を用いて錘を偏光板保持枠外周の最下位位置に固定す
ることができる。そうすると、ピント調整の目的でレン
ズ鏡筒を光軸回りに回転操作させたときに、フィルタ取
付部は回転するが、錘が固定されているので偏光板保持
枠は回転せず、偏光板も回転しない。その結果、偏光板
の向きを一度適正な向きに設定しておけば、その状態を
維持することが可能となり、ピント調整を行う度に偏光
板の向きを合わせ直す必要がない。According to the above structure, the polarizing plate holding frame is rotated so that the orientation of the polarizing plate is proper, and in this state, the weight is fixed to the lowermost position of the outer periphery of the polarizing plate holding frame using the fixing means. Can be. Then, when the lens barrel is rotated around the optical axis for the purpose of focus adjustment, the filter mounting portion rotates, but the weight is fixed, so the polarizing plate holding frame does not rotate, and the polarizing plate also rotates. do not do. As a result, once the direction of the polarizing plate is set to an appropriate direction, it is possible to maintain that state, and it is not necessary to adjust the direction of the polarizing plate every time focus adjustment is performed.
【００１０】請求項２に記載の発明は、偏光板と、該偏
光板を保持する円環状の偏光板保持枠と、該偏光板保持
枠をレンズ鏡筒先端のフィルタ枠に取り付けるための円
環状のフィルタ取付部とを備えた偏光フィルタにおい
て、前記偏光板保持枠を前記フィルタ取付部に回転自在
に取り付け、前記偏光板保持枠の外周に円環状の回転枠
を回転自在に設けるとともに、前記偏光板保持枠外周の
任意の位置に前記回転枠を固定し且つ錘の機能を有する
止めネジを設けたことを特徴としている。According to a second aspect of the present invention, there is provided a polarizing plate, an annular polarizing plate holding frame for holding the polarizing plate, and an annular shape for attaching the polarizing plate holding frame to a filter frame at the tip of a lens barrel. And a filter mounting portion, wherein the polarizing plate holding frame is rotatably attached to the filter mounting portion, and an annular rotating frame is rotatably provided on the outer periphery of the polarizing plate holding frame, and the polarization plate The rotary frame is fixed at an arbitrary position on the outer periphery of the plate holding frame and a set screw having a weight function is provided.
【００１１】請求項２は請求項１をより具体化したもの
である。請求項２の構成によれば、まず、止めネジを緩
めて偏光板保持枠を光軸回りに回転させ、偏光板の向き
が適正な角度となるよう調整する。そして、止めネジが
偏光板保持枠の最下位位置にくるようにして、該止めネ
ジで回転枠を偏光板保持枠外周に固定する。そうする
と、ピント調整の目的でレンズ鏡筒を光軸回りに回転操
作させたときに、フィルタ取付部は回転するが、錘の機
能を有する止めネジによって偏光板保持枠は回転せず、
偏光板も回転しない。その結果、請求項１の場合と同様
に、偏光板の向きを一度適正な向きに設定しておけば、
その状態を維持することが可能となり、ピント調整を行
う度に偏光板の向きを合わせ直す必要がない。[0011] Claim 2 is a more specific version of claim 1. According to the configuration of the second aspect, first, the set screw is loosened, and the polarizing plate holding frame is rotated around the optical axis, so that the direction of the polarizing plate is adjusted to an appropriate angle. Then, the rotating frame is fixed to the outer periphery of the polarizing plate holding frame with the set screw so that the set screw is located at the lowest position of the polarizing plate holding frame. Then, when the lens barrel is rotated around the optical axis for the purpose of focus adjustment, the filter mounting portion is rotated, but the polarizing plate holding frame is not rotated by the set screw having a weight function,
The polarizer does not rotate. As a result, as in the case of claim 1, once the direction of the polarizing plate is set to an appropriate direction,
This state can be maintained, and there is no need to re-orient the polarizing plate each time focus adjustment is performed.
【００１２】請求項３に記載の発明は、請求項１又は２
において、前記偏光板保持枠と前記フィルタ取付部との
間にはボールまたはローラが設けられていることを特徴
としている。[0012] The invention according to claim 3 is the invention according to claim 1 or 2.
Wherein a ball or a roller is provided between the polarizing plate holding frame and the filter mounting portion.
【００１３】偏光板保持枠とフィルタ取付部との間にボ
ールまたはローラが設けられていれば、フィルタ取付部
をレンズ鏡筒先端のフィルタ枠に取り付けたときに、偏
光板保持枠の回転を滑らかにすることができる。If a ball or a roller is provided between the polarizing plate holding frame and the filter mounting portion, the rotation of the polarizing plate holding frame is smooth when the filter mounting portion is mounted on the filter frame at the tip of the lens barrel. Can be
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の形態を図面
に従って説明する。図１は本発明に係る偏光フィルタの
縦断面図であり、図２は図１のＡ−Ａ線に沿った断面図
である。図に示すように、本発明に係る偏光フィルタ１
０には偏光板１１が設けられ、この偏光板１１の周縁部
に円環状の偏光板保持枠１２が取り付けられている。偏
光板保持枠１２のレンズ鏡筒側（図の右側）には段付部
１２Ａが形成されている。偏光板１１を挟んで段付部１
２Ａの反対側には偏光板押え環１３が設けられている。
そして、偏光板押え環１３と偏光板保持枠１２とはネジ
で結合され、そのネジを締め付けることにより、偏光板
１１は、その周縁部が偏光板押え環１３と段付部１２Ａ
に挟持されて、偏光板保持枠１２の内部に保持されてい
る。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a polarizing filter according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. As shown in the figure, the polarizing filter 1 according to the present invention
A polarizing plate 11 is provided at 0, and an annular polarizing plate holding frame 12 is attached to the periphery of the polarizing plate 11. A stepped portion 12A is formed on the lens barrel side (the right side in the figure) of the polarizing plate holding frame 12. Stepped portion 1 with polarizing plate 11 interposed
On the opposite side of 2A, a polarizing plate press ring 13 is provided.
Then, the polarizing plate holding ring 13 and the polarizing plate holding frame 12 are joined by screws, and by tightening the screws, the periphery of the polarizing plate 11 becomes the polarizing plate holding ring 13 and the stepped portion 12A.
And held inside the polarizing plate holding frame 12.
【００１５】偏光板保持枠１２のレンズ鏡筒側外周には
溝部１２Ｃが形成され、この溝部１２Ｃにボール１４が
設けられている。ボール１４は、図２に示すように溝部
１２Ｃの円周上３箇所に均等に配置され、ボール１４が
配置されてない溝部１２Ｃには断面形状が円形のスペー
サ１５が設けられている。A groove 12C is formed on the outer periphery of the polarizing plate holding frame 12 on the lens barrel side, and a ball 14 is provided in the groove 12C. As shown in FIG. 2, the balls 14 are evenly arranged at three positions on the circumference of the groove 12C, and the groove 12C where the ball 14 is not arranged is provided with a spacer 15 having a circular cross section.
【００１６】また図１に示すように、ボール１４及びス
ペーサ１５の近傍にはボール押え環１６とフィルタ取付
部１７が設けられている。ボール押え環１６とフィルタ
取付部１７は円環状に形成され、互いにネジで結合され
ている。ボール１４及びスペーサ１５は、ボール押え環
１６とフィルタ取付部１７により移動範囲が規制され、
溝部１２Ｃから逸脱することはない。またボール１４が
設けられているので、偏光板保持枠１２はボール押え環
１６及びフィルタ取付部１７に対してスムーズに回転す
ることができる。なお、ボール１４の代わりにローラを
用いることもできる。As shown in FIG. 1, a ball holding ring 16 and a filter mounting portion 17 are provided near the ball 14 and the spacer 15. The ball press ring 16 and the filter mounting portion 17 are formed in an annular shape, and are connected to each other by screws. The movement range of the ball 14 and the spacer 15 is restricted by the ball holding ring 16 and the filter mounting portion 17,
There is no deviation from the groove 12C. Further, since the balls 14 are provided, the polarizing plate holding frame 12 can rotate smoothly with respect to the ball holding ring 16 and the filter mounting portion 17. Note that a roller can be used instead of the ball 14.
【００１７】フィルタ取付部１７のレンズ鏡筒側にはネ
ジ１７Ａが形成され、このネジ１７Ａは、フィルタ枠１
８に形成されたネジ１８Ａに螺合している。これによっ
て、偏光フィルタ１０はレンズ鏡筒先端に着脱自在に取
り付けることができる。A screw 17A is formed on the lens barrel side of the filter mounting portion 17, and this screw 17A
8 is screwed into a screw 18A formed in the same. Thereby, the polarizing filter 10 can be detachably attached to the tip of the lens barrel.
【００１８】また、偏光板保持枠１２の外周面には円環
状の回転枠１９が設けられている。回転枠１９の内周面
と偏光板保持枠１２の外周面との間には僅かな隙間が形
成されており、偏光板保持枠１２に対して回転枠１９は
回転自在となっている。また回転枠１９には１つのネジ
孔１９Ａが形成され、このネジ孔１９Ａに止めネジ２０
が螺合している。そして、止めネジ２０を締め付けるこ
とにより、止めネジ２０の先端が偏光板保持枠１２外周
に当接し、回転枠１９を偏光板保持枠１２の外周面に固
定することができる。また、止めネジ２０は錘の機能を
有しており、止めネジ２０を締め付けたとき、その重量
によって回転枠１９及び偏光板保持枠１２を回転させ、
止めネジ２０は常に偏光板保持枠１２の最下位位置にく
る。An annular rotating frame 19 is provided on the outer peripheral surface of the polarizing plate holding frame 12. A slight gap is formed between the inner peripheral surface of the rotating frame 19 and the outer peripheral surface of the polarizing plate holding frame 12, and the rotating frame 19 is rotatable with respect to the polarizing plate holding frame 12. Further, one screw hole 19A is formed in the rotating frame 19, and a set screw 20A is formed in the screw hole 19A.
Is screwed. Then, by tightening the set screw 20, the tip of the set screw 20 comes into contact with the outer periphery of the polarizing plate holding frame 12, and the rotating frame 19 can be fixed to the outer circumferential surface of the polarizing plate holding frame 12. Further, the set screw 20 has a function of a weight, and when the set screw 20 is tightened, the rotating frame 19 and the polarizing plate holding frame 12 are rotated by the weight thereof,
The set screw 20 always comes to the lowest position of the polarizing plate holding frame 12.
【００１９】止めネジ２０を緩めたときに回転枠１９が
偏光板保持枠１２から外れるのを防ぐために、偏光板保
持枠１２の先端側（図の左側）には円環状の回転枠押え
環２１が設けられている。この回転枠押え環２１は偏光
板保持枠１２にネジで結合されている。In order to prevent the rotating frame 19 from coming off the polarizing plate holding frame 12 when the set screw 20 is loosened, an annular rotating frame holding ring 21 is provided on the leading end side (left side in the figure) of the polarizing plate holding frame 12. Is provided. The rotating frame holding ring 21 is coupled to the polarizing plate holding frame 12 with a screw.
【００２０】図３は、上記構成の偏光フィルタが取り付
けられるレンズ鏡筒の縦断面図であり、中心軸Ｌよりも
上半分の構成を示している。中心軸Ｌよりも下半分もほ
ぼ同様な構成である。図に示すように、フィルタ枠１８
には前群レンズ３０が取り付けられている。また、フィ
ルタ枠１８にはネジ部１８Ｂ及び突起１８Ｃが形成さ
れ、ネジ部１８Ｂは前群移動枠３１に形成されたネジ部
３１Ａに螺合し、突起１８Ｃは距離操作環３２に形成さ
れた溝部３２Ａに係合されている。距離操作環３２は外
筒３３の内部に回転自在に設けられており、距離操作環
３２を中心軸Ｌの回りに（つまり光軸回り）に回転させ
ると、フィルタ枠１８の突起１８Ｃが溝部３２Ａに係合
されているので、フィルタ枠１８も光軸回りに回転す
る。そしてフィルタ枠１８が回転すると、ネジ部１８Ｂ
とネジ部３１Ａとの螺合によりフィルタ枠１８は矢印Ｃ
のように移動して前群レンズ３０を光軸方向に移動させ
ることができる。なお、前群移動枠３１はズーム調整時
には移動するが、距離操作環３２の回転時には通常は移
動しない。ズーム調整の機構については後述する。FIG. 3 is a longitudinal sectional view of a lens barrel to which the polarizing filter having the above-mentioned structure is attached, and shows an upper half of the center axis L. The lower half of the center axis L has substantially the same configuration. As shown in FIG.
Is mounted with a front group lens 30. A screw portion 18B and a projection 18C are formed on the filter frame 18, the screw portion 18B is screwed into a screw portion 31A formed on the front group moving frame 31, and the projection 18C is a groove formed on the distance operation ring 32. 32A. The distance operation ring 32 is rotatably provided inside the outer cylinder 33. When the distance operation ring 32 is rotated around the central axis L (that is, around the optical axis), the projection 18C of the filter frame 18 is turned into the groove 32A. , The filter frame 18 also rotates around the optical axis. When the filter frame 18 rotates, the screw portion 18B
Frame 18 is formed by an arrow C due to the screwing of
And the front group lens 30 can be moved in the optical axis direction. The front group moving frame 31 moves during zoom adjustment, but does not normally move when the distance operation ring 32 rotates. The mechanism for zoom adjustment will be described later.
【００２１】外筒３３のバヨネット環３４側外周にはズ
ーム環３５が回転自在に設けられている。ズーム環３５
の内周面には、カム環３６に取り付けられたズーム軸３
７の先端部が固定されている。ズーム軸３７は、外筒３
３に形成された長孔３３Ａに挿通されている。長孔３３
Ａは外筒３３の円周方向に形成され、またその幅はズー
ム軸３７の外径より広くなっている。A zoom ring 35 is rotatably provided on the outer periphery of the outer cylinder 33 on the bayonet ring 34 side. Zoom ring 35
The inner peripheral surface of the zoom shaft 3 attached to the cam ring 36
7 is fixed at its tip. The zoom axis 37 is the outer cylinder 3
3 is inserted through a long hole 33A. Long hole 33
A is formed in the circumferential direction of the outer cylinder 33, and its width is wider than the outer diameter of the zoom shaft 37.
【００２２】また、カム環３６は円筒状をなし、直進環
３８の外側に回転自在に設けられている。カム環３６の
円筒面には長孔３６Ａ，３６Ｂが形成され、長孔３６Ａ
には前群移動枠３１に取り付けられたローラ３９が、長
孔３６Ｂには後群移動枠４０に取り付けられたローラ４
１がそれぞれ係合されている。また後群移動枠４０には
後群レンズ４２が取り付けられている。長孔３６Ａ，３
６Ｂはカム環３６の円周方向に対して斜めに（スパイラ
ル状に）形成されている。The cam ring 36 has a cylindrical shape and is rotatably provided outside the rectilinear ring 38. Slots 36A and 36B are formed in the cylindrical surface of the cam ring 36, and the slots 36A
The roller 39 attached to the front-group moving frame 31 has a roller 39 attached to the front-group moving frame 31.
1 are respectively engaged. A rear group lens 42 is attached to the rear group moving frame 40. Slot 36A, 3
6B is formed obliquely (spirally) with respect to the circumferential direction of the cam ring 36.
【００２３】そして、ズーム環３５を光軸回りに回転さ
せると、ズーム軸３７によりカム環３６も光軸回りに回
転し、長孔３６Ａ，３６Ｂに係合のローラ３９，４１に
よって、前群移動枠３１が矢印Ｄのように、後群移動枠
４０が矢印Ｅのようにそれぞれ移動して、前群レンズ３
０及び後群レンズ４２を光軸方向に移動させることがで
きる。When the zoom ring 35 is rotated around the optical axis, the cam ring 36 is also rotated around the optical axis by the zoom shaft 37, and the front group is moved by the rollers 39 and 41 engaged with the long holes 36A and 36B. The frame 31 moves as indicated by an arrow D, and the rear group moving frame 40 moves as indicated by an arrow E.
The 0 and rear group lenses 42 can be moved in the optical axis direction.
【００２４】なお、長孔３６Ａをカム環３６の円周方向
に形成して、ズーム環３５を回転操作したときに、前群
レンズ３０は移動させず、後群レンズ４２だけを光軸方
向に移動させるようにすることもできる。When the zoom ring 35 is rotated by forming the elongated hole 36A in the circumferential direction of the cam ring 36, the front group lens 30 is not moved, and only the rear group lens 42 is moved in the optical axis direction. It can also be moved.
【００２５】次に、上記構成の偏光フィルタの作用につ
いて説明する。まず、偏光板１１の向きを設定する際に
は、止めネジ２０を緩めてから偏光板保持枠１２を光軸
回りに回転させ、偏光板１１の向きが適正な角度となる
よう調整する。偏光板１１の向きを設定し終わったら、
偏光板１１が回転しないようにしながら止めネジ２０が
偏光板保持枠１２の最下位位置にくるようにして、止め
ネジ２０を締め付けて回転枠１９を偏光板保持枠１２の
外周に固定する。Next, the operation of the polarizing filter having the above configuration will be described. First, when setting the direction of the polarizing plate 11, the set screw 20 is loosened, and then the polarizing plate holding frame 12 is rotated around the optical axis to adjust the direction of the polarizing plate 11 to an appropriate angle. After setting the orientation of the polarizing plate 11,
The set screw 20 is positioned at the lowest position of the polarizing plate holding frame 12 while the polarizing plate 11 is not rotated, and the set screw 20 is tightened to fix the rotating frame 19 to the outer periphery of the polarizing plate holding frame 12.
【００２６】このように偏光板保持枠１２の外周に回転
枠１９を固定すれば、ピント調整のために例えば距離操
作環３２を光軸回りに回転操作させたとき、フィルタ取
付部１７とボール押え環１６は回転するが、ボール１４
と錘の機能を有する止めネジ２０とによって偏光板保持
枠１２は回転せず、偏光板１１も回転しない。そのため
に、偏光板１１の向きを一度適正な向きに設定しておけ
ば、その状態を維持することが可能となり、ピント調整
を行う度に偏光板１１の向きを合わせ直す必要がない。When the rotating frame 19 is fixed to the outer periphery of the polarizing plate holding frame 12 as described above, when the distance operation ring 32 is rotated around the optical axis for focus adjustment, for example, the filter mounting portion 17 and the ball holder The ring 16 rotates, but the ball 14
The polarizing plate holding frame 12 does not rotate, and the polarizing plate 11 does not rotate due to the set screw 20 having a weight function. Therefore, once the direction of the polarizing plate 11 is set to an appropriate direction, it is possible to maintain that state, and it is not necessary to adjust the direction of the polarizing plate 11 every time focus adjustment is performed.
【００２７】また、止めネジ２０は常に偏光板保持枠１
２の最下位位置にくるので、カメラを横にして構えても
縦にして構えても、偏光板１１の向きを合わせ直すこと
なく撮影可能である。The set screw 20 is always attached to the polarizing plate holding frame 1.
Since the camera is located at the lowest position of 2, the camera can be photographed without re-orienting the polarizing plate 11 regardless of whether the camera is held horizontally or vertically.
【００２８】[0028]
【発明の効果】以上説明したように、本発明によれば、
同一被写体を撮影する際には、偏光板の向きを一度適正
な向きに設定すると、その状態を維持することが可能と
なり、ピント調整を行う度に偏光板の向きを合わせ直す
煩わしさがなくなる。As described above, according to the present invention,
When photographing the same subject, once the orientation of the polarizing plate is set to an appropriate orientation, it is possible to maintain that state, and the trouble of re-orienting the polarizing plate every time focus adjustment is performed is eliminated.
【００２９】また、同一被写体に対して偏光板の向きを
一度適正な向きに設定すれば、カメラを横にしても縦に
しても、そのままの状態で撮影可能である。Further, once the direction of the polarizing plate is set to an appropriate direction for the same subject, it is possible to take a picture as it is regardless of whether the camera is horizontal or vertical.
【図１】本発明に係る偏光フィルタの縦断面図である。FIG. 1 is a longitudinal sectional view of a polarizing filter according to the present invention.
【図２】図１のＡ−Ａ線に沿った断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】本発明に係る偏光フィルタが取り付けられるレ
ンズ鏡筒の縦断面図である。FIG. 3 is a longitudinal sectional view of a lens barrel to which the polarizing filter according to the present invention is attached.
【図４】従来技術による偏光フィルタの縦断面図であ
る。FIG. 4 is a longitudinal sectional view of a conventional polarizing filter.
１０ 偏光フィルタ １１ 偏光板 １２ 偏光板保持枠 １３ 偏光板押え環 １４ ボール １５ スペーサ １６ ボール押え環 １７ フィルタ取付部 １８ フィルタ枠 １９ 回転枠 ２０ 止めネジ ２１ 回転枠押え環 REFERENCE SIGNS LIST 10 polarizing filter 11 polarizing plate 12 polarizing plate holding frame 13 polarizing plate holding ring 14 ball 15 spacer 16 ball holding ring 17 filter mounting portion 18 filter frame 19 rotation frame 20 set screw 21 rotation frame holding ring
Claims (3)
偏光板保持枠と、該偏光板保持枠をレンズ鏡筒先端のフ
ィルタ枠に取り付けるための円環状のフィルタ取付部と
を備えた偏光フィルタにおいて、 前記偏光板保持枠を前記フィルタ取付部に回転自在に取
り付けるとともに、前記偏光板保持枠外周の任意の位置
に錘を固定する固定手段を設けたことを特徴とする偏光
フィルタ。1. A polarizing plate, an annular polarizing plate holding frame for holding the polarizing plate, and an annular filter attaching portion for attaching the polarizing plate holding frame to a filter frame at the tip of a lens barrel. The polarizing filter, wherein the polarizing plate holding frame is rotatably attached to the filter mounting portion, and fixing means for fixing a weight at an arbitrary position on the outer periphery of the polarizing plate holding frame is provided.
偏光板保持枠と、該偏光板保持枠をレンズ鏡筒先端のフ
ィルタ枠に取り付けるための円環状のフィルタ取付部と
を備えた偏光フィルタにおいて、 前記偏光板保持枠を前記フィルタ取付部に回転自在に取
り付け、前記偏光板保持枠の外周に円環状の回転枠を回
転自在に設けるとともに、前記偏光板保持枠外周の任意
の位置に前記回転枠を固定し且つ錘の機能を有する止め
ネジを設けたことを特徴とする偏光フィルタ。2. A polarizing plate, comprising: an annular polarizing plate holding frame for holding the polarizing plate; and an annular filter attaching portion for attaching the polarizing plate holding frame to a filter frame at the tip of a lens barrel. In the polarizing filter, the polarizing plate holding frame is rotatably attached to the filter mounting portion, and an annular rotating frame is rotatably provided on the outer periphery of the polarizing plate holding frame. A polarizing filter, wherein a set screw having the function of a weight is provided while fixing the rotating frame at a position.
おいて、 前記偏光板保持枠と前記フィルタ取付部との間にはボー
ルまたはローラが設けられていることを特徴とする偏光
フィルタ。3. The polarizing filter according to claim 1, wherein a ball or a roller is provided between the polarizing plate holding frame and the filter mounting portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13058297A JP3974220B2 (en) | 1997-05-21 | 1997-05-21 | Polarizing filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13058297A JP3974220B2 (en) | 1997-05-21 | 1997-05-21 | Polarizing filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10319474A true JPH10319474A (en) | 1998-12-04 |
| JP3974220B2 JP3974220B2 (en) | 2007-09-12 |
Family
ID=15037669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13058297A Expired - Fee Related JP3974220B2 (en) | 1997-05-21 | 1997-05-21 | Polarizing filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3974220B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000275492A (en) * | 1999-03-24 | 2000-10-06 | Asahi Optical Co Ltd | Lens barrel |
| US6492635B2 (en) | 2001-01-09 | 2002-12-10 | Dror Simchoni | Method and device for automatically controlling a polarizing filter |
| CN109416453A (en) * | 2016-07-08 | 2019-03-01 | 日本电产科宝株式会社 | Lens retaining features and photographic device |
-
1997
- 1997-05-21 JP JP13058297A patent/JP3974220B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000275492A (en) * | 1999-03-24 | 2000-10-06 | Asahi Optical Co Ltd | Lens barrel |
| US6492635B2 (en) | 2001-01-09 | 2002-12-10 | Dror Simchoni | Method and device for automatically controlling a polarizing filter |
| CN109416453A (en) * | 2016-07-08 | 2019-03-01 | 日本电产科宝株式会社 | Lens retaining features and photographic device |
| CN109416453B (en) * | 2016-07-08 | 2021-07-02 | 日本电产科宝株式会社 | Lens holding mechanism and imaging device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3974220B2 (en) | 2007-09-12 |
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