JPH0687940U - Camera diaphragm - Google Patents
Camera diaphragmInfo
- Publication number
- JPH0687940U JPH0687940U JP3513193U JP3513193U JPH0687940U JP H0687940 U JPH0687940 U JP H0687940U JP 3513193 U JP3513193 U JP 3513193U JP 3513193 U JP3513193 U JP 3513193U JP H0687940 U JPH0687940 U JP H0687940U
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- Prior art keywords
- blade
- opening
- diameter
- light receiving
- diaphragm
- 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.)
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Abstract
(57)【要約】
【目的】 絞り装置における羽根と開放径との間に生じ
ていた隙間をなくして、小絞り時のシェーディング現象
を防止しかつレンズ設計基準値に開放径がくるようにす
ることにある。
【構成】 互いに対向する受光開口１２，５２を有する
第１,第２のガイド板１０，５０間に第１,第２の羽根２
０，３０を相対的に逆方向に移動自在に支持して、前記
受光開口１２，５２を開閉可能とする一方、この第１の
羽根２０と第２の羽根３０との間に、開放径用の開口４
２を有する開放径規制部材４０を挟んだ構成とする。
(57) [Abstract] [Purpose] To prevent the shading phenomenon at the time of a small aperture and to make the aperture diameter come to the lens design standard value by eliminating the gap between the blade and the aperture diameter in the aperture device. Especially. [Structure] First and second blades 2 are provided between first and second guide plates 10 and 50 having light receiving openings 12 and 52 facing each other.
0 and 30 are movably supported in the opposite directions so that the light receiving openings 12 and 52 can be opened and closed, while an opening diameter is provided between the first blade 20 and the second blade 30. Opening 4
The opening diameter regulating member 40 having the number 2 is sandwiched.
Description
【０００１】[0001]
本考案は、ビデオカメラ等の絞り装置に関するものである。 The present invention relates to a diaphragm device such as a video camera.
【０００２】[0002]
従来、ビデオカメラの絞り装置１は、図１０に示す如く、ズームレンズａとフ ォーカスレンズｂの両レンズ鏡胴間に差し込む形でセットされ、ＣＣＤより成る 固体撮像装置ｃより得たビデオ信号の輝度信号の変化に基づいて、光量制御装置 ｄにより絞り羽根の駆動装置２を制御し、外光の強弱に適した絞り値（Ｆ値）を 得るようになっている。 Conventionally, a diaphragm device 1 of a video camera is set so as to be inserted between both lens barrels of a zoom lens a and a focus lens b as shown in FIG. 10, and a video signal obtained from a solid-state image pickup device c composed of a CCD is used. Based on the change in the brightness signal, the light quantity control device d controls the diaphragm blade drive device 2 to obtain an aperture value (F value) suitable for the intensity of external light.
【０００３】 また、絞り装置自体は、互いに対向する受光開口３，４を有する第１,第２の ガイド板間に第１,第２の羽根５，６を相対的に逆方向に移動自在に支持し、こ の羽根５，６を駆動装置２の作動レバーの両端ピンで駆動して、２枚の絞り羽根 ５，６が受光開口３，４を開閉するようになっている。即ち、従来の絞り装置で は、その絞り開放時の口径（開放径）を、絞り装置の外形を形づくっている第１ ,第２のガイド板（地板及び押え板と称される）の受光開口３，４で構成してい る。Further, the diaphragm device itself is configured such that the first and second blades 5 and 6 are relatively movable in opposite directions between the first and second guide plates having the light receiving openings 3 and 4 facing each other. The blades 5 and 6 are supported and driven by pins at both ends of the actuating lever of the drive unit 2 so that the two diaphragm blades 5 and 6 open and close the light receiving openings 3 and 4. That is, in the conventional diaphragm device, the aperture (opening diameter) when the diaphragm is opened is the light receiving opening of the first and second guide plates (referred to as the base plate and the holding plate) that form the outer shape of the diaphragm device. It is composed of 3 and 4.
【０００４】[0004]
ところで、ＣＣＤの大きさが１／２〜１／３インチへと小さくなるにつれて、 絞り装置がレンズとレンズ間に入る幅が狭くなり、焦点距離と開放径の位置関係 が若干ずれても画像に影響を与えてしまう。しかるに、従来の絞り装置は、開放 径と絞り羽根との間にかなりのすき間を持っている。 By the way, as the size of the CCD is reduced to 1/2 to 1/3 inch, the width of the aperture device between the lenses becomes narrower, and even if the positional relationship between the focal length and the open diameter is slightly deviated, an image is displayed. It will have an impact. However, the conventional diaphragm device has a considerable gap between the opening diameter and the diaphragm blade.
【０００５】 このため、次のような問題があった。Therefore, there are the following problems.
【０００６】 （１）開放径と絞り羽根との間のすき間が大きいため、小絞り状態の時に斜め の光線が入りシェーディング現象を起こしやすい。(1) Since there is a large gap between the open diameter and the diaphragm blade, oblique light rays are likely to enter and a shading phenomenon occurs in a small diaphragm state.
【０００７】 （２）レンズの設計上前玉レンズと後玉レンズの間に入る開放径は、設計基準 で１点のみで幅がないことが望ましいが、従来の構成では、開放径と絞り羽根の 間にかなりのすき間が存在するため、開放径がレンズで設計する基準位置になら なず、ＣＣＤに入る光の領域が異なってしまう。一般に、レンズに入射してくる 光の領域（視野の最大範囲）はＣＣＤの画角とレンズの特性から導き出され、そ の領域は絞り装置の開放径に依存する。(2) Due to the design of the lens, it is desirable that the open diameter between the front lens and the rear lens is only one point according to the design criteria and there is no width. Since there is a considerable gap between them, the open diameter does not become the reference position designed by the lens, and the area of light entering the CCD is different. Generally, the area of the light incident on the lens (the maximum range of the field of view) is derived from the angle of view of the CCD and the characteristics of the lens, and that area depends on the open diameter of the diaphragm.
【０００８】 そこで、本考案の目的は、絞り装置における上記課題を解決し、小絞り状態の 時に羽根と開放径（又はもう１枚の羽根）との間に生じていたすき間をなくして 、シェーディング現象を防止しかつレンズ設計基準値に開放径がくるようにする ことにある。Therefore, an object of the present invention is to solve the above problems in the diaphragm device and eliminate the gap between the blade and the open diameter (or another blade) in the small diaphragm state to eliminate shading. It is to prevent the phenomenon and to make the open diameter reach the lens design standard value.
【０００９】[0009]
上記目的を達成するために本考案は、互いに対向する受光開口を有する第１, 第２のガイド板間に第１,第２の羽根を相対的に逆方向に移動自在に支持して前 記受光開口を開閉するカメラの絞り装置において、前記第１の羽根と第２の羽根 との間に、開放径規制用の開口を有する開放径規制部材を挟んだ構成のものであ る。（請求項１） 本考案においては、開放径規制部材を第１の羽根又は第２の羽根と前記ガイド 板との間に配置することもできる。（請求項２） In order to achieve the above object, the present invention supports the first and second blades between the first and second guide plates having light receiving openings facing each other so as to be relatively movable in opposite directions. A diaphragm device for a camera that opens and closes a light receiving opening is configured such that an opening diameter restricting member having an opening for restricting an opening diameter is sandwiched between the first blade and the second blade. (Claim 1) In the present invention, the opening diameter regulating member may be arranged between the first blade or the second blade and the guide plate. (Claim 2)
請求項１によれば、摺動する羽根と羽根の間に開放径規制用の開口を有する開 放径規制部材を挟んでいるため、羽根と開放径規制用の開口との間に隙間が殆ど 生じない。このため、小絞り状態になった場合にも、斜めの光線の入射によるシ ェーデング現象は発生しない。従って画像の影響、解像度の低下を避けることが できる。 According to the first aspect of the invention, since the opening / closing diameter controlling member having the opening for controlling the opening diameter is sandwiched between the sliding blades, there is almost no gap between the blade and the opening for controlling the opening diameter. Does not happen. Therefore, even in the small aperture state, the shading phenomenon due to the incidence of oblique rays does not occur. Therefore, it is possible to avoid the influence of the image and the deterioration of the resolution.
【００１０】 また、前玉レンズと後玉レンズの間に入る開放径の位置は、不動の１点のみと なるため、レンズ設計上の基準位置に一致させることができ、ＣＣＤに入る光の 領域を一定化することができる。Further, since the position of the open diameter entering between the front lens and the rear lens is only one fixed point, it can be matched with the reference position in the lens design, and the area of the light entering the CCD. Can be constant.
【００１１】 更にまた、第１,第２のガイド板の受光開口にレンズの鏡枠が入って来ても開 放径を構成できる。従って、絞り装置が必要とする幅を縮めることができる。Furthermore, even if the lens frame of the lens enters the light receiving openings of the first and second guide plates, the open diameter can be configured. Therefore, the width required by the diaphragm device can be reduced.
【００１２】 請求項２では、第１の羽根又は第２の羽根と前記ガイド板との間に開放径規制 部材を位置させるため、第１,第２のガイド板の受光開口で開放径を形づくる場 合よりも、より内側に開放径規制部材の開口が来る。従って、かかる構成の下で も、上記のシェーデイングの防止及びレンズ設計上の基準位置との整合を図るこ とができる。In the present invention, since the opening diameter restricting member is located between the first blade or the second blade and the guide plate, the opening diameter is formed by the light receiving openings of the first and second guide plates. The opening of the opening diameter regulation member comes inward more than in the case. Therefore, even with such a configuration, it is possible to prevent the above-mentioned shading and to match with the reference position in lens design.
【００１３】[0013]
以下、本考案の一実施例を添付図面に基づいて詳述する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
【００１４】 本絞り装置Ａは、図１のように、互いに対向配置された第１のガイド板として の地板１０（図２〜図４）と第２のガイド板としての押さえ板５０（図８及び図 ９）との間に、第１，第２の羽根２０,３０（図５，図７）を重ねて配置して相 対的に逆方向に移動自在に支持し、更に第１，第２の羽根２０，３０の間に開放 径規制部材４０（図６）を固定的に配置して構成されている。第１，第２の羽根 ２０，３０は、これを地板１０の外側筒部１１に取り付けた電磁的駆動装置２（ 図１０参照）の回動により、正確にはその作動レバー７の両端に設けた駆動ピン ８，９の旋回動作により相対的に逆方向に駆動して、地板１０及び押さえ板５０ の中央に設けた受光開口１２，５２を羽根２０，３０で開閉するようになってい る。以下、地板１０と押さえ板５０の互いに対向する面を「内面」、他側の面を 「外面」として説明する。As shown in FIG. 1, the present diaphragm device A includes a base plate 10 (FIGS. 2 to 4) as a first guide plate and a holding plate 50 (FIG. 8) as a second guide plate, which are arranged to face each other. 9 and FIG. 9), the first and second blades 20 and 30 (FIGS. 5 and 7) are overlapped and supported so as to be movable relative to each other in opposite directions. An open diameter regulating member 40 (FIG. 6) is fixedly arranged between the two blades 20 and 30. The first and second blades 20 and 30 are accurately provided at both ends of the operating lever 7 by the rotation of the electromagnetic drive device 2 (see FIG. 10) attached to the outer cylinder portion 11 of the main plate 10. The drive pins 8 and 9 are driven to rotate relatively in opposite directions, and the blades 20 and 30 open and close the light receiving openings 12 and 52 provided at the centers of the main plate 10 and the pressing plate 50. Hereinafter, the surfaces of the main plate 10 and the pressing plate 50 that face each other will be described as "inner surface" and the other surface will be described as "outer surface".
【００１５】 （１）地板 地板１０は合成樹脂より成り、図２〜図４のように、その中央の受光開口１２ より後方の面領域には、駆動装置２の駆動ピン８，９が挿通する一対の円弧状ス リット１３が形成されている。２ａは駆動装置２の取付穴である。(1) Base Plate The base plate 10 is made of synthetic resin, and as shown in FIGS. 2 to 4, the drive pins 8 and 9 of the drive device 2 are inserted into the surface area behind the light receiving opening 12 at the center thereof. A pair of arc-shaped slits 13 are formed. Reference numeral 2a is a mounting hole for the drive device 2.
【００１６】 地板１０の内面には、可動羽根２０，３０の直線的且つ円滑な往復動作を実現 するため、一方の側壁側に一対の支持部材例えばガイドピン１４,１４が、また 、他方の側壁側に一対の支持部材例えばガイドピン１５,１５が設けられ、各ガ イドピン１４，１５は羽根２０，３０のガイド穴２１，３１（図５、図７）を挿 通して、羽根２０，３０を安定にガイドしている。更に、地板１０の内面には、 羽根２０，３０との接触面積をできるだけ小さくして円滑かつ安定した平行運動 を行なわせるため、地板１０に近い側の羽根２０を支持する膨出高さの低い支持 突起１６と、地板１０から遠い方の羽根３０を支持する膨出高さの高い支持突起 １７との高低２種類の支持突起が、それぞれ適数個形成されている。On the inner surface of the main plate 10, in order to realize the linear and smooth reciprocating motion of the movable blades 20 and 30, a pair of supporting members, for example, guide pins 14 and 14 are provided on one side wall side, and another side wall is provided. A pair of supporting members, for example, guide pins 15 and 15 are provided on the side, and the guide pins 14 and 15 are inserted into the guide holes 21 and 31 (FIGS. 5 and 7) of the blades 20 and 30 to fix the blades 20 and 30. It guides stably. Further, the inner surface of the main plate 10 has a small bulge height for supporting the blade 20 on the side close to the main plate 10 in order to make the contact area with the blades 20 and 30 as small as possible to perform smooth and stable parallel movement. An appropriate number of two types of support protrusions, that is, a support protrusion 16 and a support protrusion 17 having a high bulge height for supporting the blade 30 far from the base plate 10, are formed.
【００１７】 なお、地板１０の両側縁及び後縁には、押さえ板５０を地板１０に止めるため の係合突起１８が設けられており、また両側縁には、地板１０を鏡筒本体Ｂに取 り付ける固定穴１９が設けられている。 （２）羽根 第１の羽根２０は黒色ポリエステルの薄片から成り、図５のように、中央部に 絞り形成用の横ｖ字状の切欠２２を備えると共に、一方の側縁側には、上記ガイ ドピン１４に係合する側縁に平行な長穴より成るガイド穴２１を有している。更 に、この一方の側縁側の後端部には、駆動装置２の作動レバー７の駆動ピン８， ９のうちの一つ９が挿入枢着されるピン穴２３が形成されている。It should be noted that engaging protrusions 18 for retaining the pressing plate 50 on the base plate 10 are provided on both side edges and a rear edge of the base plate 10, and the base plate 10 is attached to the lens barrel body B on both side edges. A fixing hole 19 for mounting is provided. (2) Blade The first blade 20 is made of a thin piece of black polyester, has a horizontal v-shaped notch 22 for forming a diaphragm in the center, and has the above-mentioned guide on one side edge side as shown in FIG. It has a guide hole 21 formed of an elongated hole parallel to the side edge that engages with the pin 14. Further, a pin hole 23 into which one of the drive pins 8 and 9 of the actuating lever 7 of the drive device 2 is inserted and pivotally formed is formed at the rear end portion of the one side edge side.
【００１８】 第２の羽根３０も黒色ポリエステルの薄片から成り、図７のように、絞り形成 用の横ｖ字状の切欠３２を備えると共に、上述した羽根２０の一方の側縁とは反 対側の他方の側縁側に、ガイドピン１５に係合するガイド穴３１を有し、このガ イド穴３１も側縁に平行な長穴として形成されている。更に、このガイド穴３１ の形成された側縁側において、羽根３０の後端部には、駆動装置２の他の駆動ピ ン８が挿入されるピン穴３３が形成されている。The second blade 30 is also made of a thin piece of black polyester, is provided with a lateral v-shaped notch 32 for forming a diaphragm as shown in FIG. 7, and is opposed to one side edge of the blade 20 described above. A guide hole 31 that engages with the guide pin 15 is provided on the other side edge side, and this guide hole 31 is also formed as an elongated hole parallel to the side edge. Further, on the side edge side where the guide hole 31 is formed, a pin hole 33 into which the other drive pin 8 of the drive device 2 is inserted is formed at the rear end portion of the blade 30.
【００１９】 開放径規制部材４０も黒色ポリエステルの薄片から成り、図６のように、中央 部に開放絞り時の口径を規制する円形の開口４２を有し、また側縁部近傍には、 上記ガイドピン１４，１５が貫通する位置決め孔４４，４５を計４箇所に有して いる。羽根４０は、位置決め孔４４，４５をガイドピン１４，１５に通すことに より、第１，第２の羽根２０，３０の間に固定的に配置され、またこの挿通によ り、開放径規制開口４２の受光開口１２，５２及び切欠２２，３２に対する中心 位置合わせがなされる。開放径規制開口４２の大きさは、地板１０及び押え板５ ０の受光開口１２，５２よりも羽根の切欠２２，３２が挟む最大円２４，３４の 方が小さく、この最大円２４，３４よりも開放径規制開口４２の円の方が小さい 関係になっている。この関係のため、開放絞り時の口径は、開放径規制部材４０ の開口４２の大きさで規制されることになる。 （３）押さえ板 押さえ板５０はアルミニウムの板から成り、図８のように、駆動装置２に対応 する切欠凹所５１と、地板１０の受光開口１２に対向する受光開口５２と、スリ ット１３に対向する一対の円弧状のスリット５３と、ガイドピン１４，１５に対 向するピン穴５４，５５とを備えている。The open-diameter restricting member 40 is also made of a thin piece of black polyester, has a circular opening 42 for restricting the aperture at the time of open-throttle, as shown in FIG. Positioning holes 44 and 45 through which the guide pins 14 and 15 penetrate are provided at a total of four places. The blade 40 is fixedly arranged between the first and second blades 20 and 30 by passing the positioning holes 44 and 45 through the guide pins 14 and 15, and the opening diameter is regulated by this insertion. The opening 42 is centered with respect to the light receiving openings 12 and 52 and the notches 22 and 32. Regarding the size of the opening diameter regulation opening 42, the maximum circles 24 and 34 sandwiched by the notches 22 and 32 of the blades are smaller than the light receiving openings 12 and 52 of the main plate 10 and the holding plate 50. Also, there is a relationship that the circle of the opening diameter regulation opening 42 is smaller. Due to this relationship, the aperture diameter at the time of the open aperture is restricted by the size of the opening 42 of the open diameter restricting member 40. (3) Pressing Plate The pressing plate 50 is made of an aluminum plate, and as shown in FIG. 8, a cutout recess 51 corresponding to the drive device 2, a light receiving opening 52 facing the light receiving opening 12 of the main plate 10, and a slit. A pair of arcuate slits 53 facing each other and pin holes 54 and 55 facing the guide pins 14 and 15 are provided.
【００２０】 また、羽根との接触面積をできるだけ小さくして円滑かつ安定した平行運動を 行なわせるため、内面には、押さえ板５０に近い側の羽根３０を支持する膨出高 さの低い支持突起５６と、押さえ板５０から遠い方の羽根２０を支持する膨出高 さの高い支持突起５７とが、プレス加工により形成されている。In addition, in order to make the contact area with the blade as small as possible to perform smooth and stable parallel movement, the inner surface has a support protrusion having a low bulge height for supporting the blade 30 on the side closer to the pressing plate 50. 56 and a support protrusion 57 having a high bulge height for supporting the blade 20 farther from the pressing plate 50 are formed by press working.
【００２１】 この押さえ板５０は、側縁及び後縁に設けた係合耳部５８の穴５８ａを、上記 係合突起１８に係合させることにより地板１０に固定される。この形態は、ビス 等の補助部材を用いることなく、係合耳部５８の折り曲げのみによって押さえ板 ５０を地板１０に固定できる利点を有する。 ＜動作＞ 上記構成において、絞り装置Ａは、鏡筒本体の図示してない装着穴に光路を横 切って挿入され、位置決め後、穴１９を介して鏡筒本体の穴にねじで固定される 。The pressing plate 50 is fixed to the main plate 10 by engaging the holes 58 a of the engaging ears 58 provided at the side edges and the rear edge with the engaging protrusions 18. This form has an advantage that the pressing plate 50 can be fixed to the main plate 10 only by bending the engaging ears 58 without using an auxiliary member such as a screw. <Operation> In the above configuration, the diaphragm device A is inserted into a mounting hole (not shown) of the lens barrel body across the optical path, and after positioning, is fixed to the hole of the lens barrel body through the hole 19 with a screw. .
【００２２】 このような状態において、マニュアル動作により開放径以外の絞り値が設定さ れると、この設定値に対応した出力が得られ、駆動装置２のモータコイルが励磁 されてロータマグネットが回動し、駆動ピン８，９が、例えば図１において右回 りに回動する。このため、第１の羽根２０はガイドピン１４に案内されて左側へ 移動し、第２の羽根３０はガイドピン１５に案内されて右側へ移動する。このと き、膨出高さの高い支持突起１７，５７は固定の開放径規制部材４０の領域外に 位置しており、開放径規制部材４０を迂回して遠い方の可動の羽根２０又は３０ に当接しているため、第１の羽根２０は、地板１０の低い支持突起１６及び押さ え板５０の高い支持突起５７に接触して円滑に移動し、第２の羽根３０は、押さ え板５０の低い支持突起５６及び地板１０の高い支持突起１７に接触して円滑に 移動する。In such a state, when an aperture value other than the open diameter is set by manual operation, an output corresponding to this set value is obtained, the motor coil of the drive device 2 is excited, and the rotor magnet rotates. Then, the drive pins 8 and 9 rotate clockwise, for example, in FIG. Therefore, the first blade 20 is guided by the guide pin 14 to move to the left side, and the second blade 30 is guided to the guide pin 15 to move to the right side. At this time, the support protrusions 17 and 57 having a high bulge height are located outside the area of the fixed opening diameter restricting member 40, and bypass the opening diameter restricting member 40 and move away from the movable blade 20 or 30. Since the first blade 20 is in contact with the lower support protrusion 16 of the main plate 10 and the higher support protrusion 57 of the holding plate 50, the first blade 20 moves smoothly, and the second blade 30 moves the holding plate. It contacts the low supporting protrusions 56 of 50 and the high supporting protrusions 17 of the main plate 10 and moves smoothly.
【００２３】 これにより、互いに対向する横Ｖ字状の切欠２２及び３２が接近し、両切欠に より羽根４０の開放径規制開口よりも小さ開口が形成され、設定された絞り値（ Ｆ値）に対応する絞り開口が形成される。As a result, the lateral V-shaped notches 22 and 32 facing each other approach each other, and an opening smaller than the opening diameter regulating opening of the blade 40 is formed by both the notches, and the set aperture value (F value) is set. A diaphragm aperture corresponding to is formed.
【００２４】 かかる動作において、可動羽根２０又は３０と固定羽根４０との間には殆ど隙 間が存在せず、また、中間に位置する固定羽根４０は事実上無視しうるほどに薄 い。このため、小さく絞った場合にも、斜めの光線の入射によるシェーデング現 象は発生しない。従って画像の影響、解像度の低下を避けることができる。また 、前玉レンズと後玉レンズの間に入る開放径は、固定羽根４０の開口４２という 不動の１点のみであるため、これをレンズの設計上の基準点とすることができる 。即ち、開放径をレンズ設計上の基準位置に一致させ、ＣＣＤに入る光の領域を 一定化することができる。In such an operation, there is almost no gap between the movable blade 20 or 30 and the fixed blade 40, and the fixed blade 40 located in the middle is practically negligibly thin. Therefore, even if the aperture is narrowed down, the shading phenomenon due to the incidence of oblique rays does not occur. Therefore, it is possible to avoid the influence of the image and the deterioration of the resolution. Moreover, since the open diameter that enters between the front lens and the rear lens is only one fixed point, the opening 42 of the fixed blade 40, this can be used as a reference point for designing the lens. That is, the open diameter can be made to coincide with the reference position in lens design, and the area of light entering the CCD can be made constant.
【００２５】 次に、絞り値（Ｆ値）を“開放”に設定すると、第１及び第２の羽根１０及び ２０は、図１の状態になる。互いに対向する横Ｖ字状の切欠２２及び３２が最外 位置に駆動され、両切欠により形成される開口は図５，図７に示す円２４，３４ をカバーするように大きくなる。従って、この円２４，３４よりも小さい円とし て中間に位置する羽根４０の開放径規制開口４２が有効となり、該開口４２によ る開口が形成され、設定された開放絞り値（Ｆ値）が得られる。Next, when the aperture value (F value) is set to “open”, the first and second blades 10 and 20 are in the state shown in FIG. The lateral V-shaped notches 22 and 32 facing each other are driven to the outermost position, and the opening formed by both notches becomes large so as to cover the circles 24 and 34 shown in FIGS. Therefore, the opening diameter regulation opening 42 of the blade 40 located in the middle as a circle smaller than the circles 24 and 34 becomes effective, the opening is formed by the opening 42, and the set aperture value (F value) is set. Is obtained.
【００２６】 この場合、摺動する羽根２０と羽根３０の間に開放径規制用の開口４２を有す る開放径規制部材４０を挟んでいるため、地板１０及び押え板５０の受光開口１ ２，５２にレンズの鏡枠が入って来ても開放径を構成することができる。このこ とは絞り装置の必要とする幅を縮めることができることを意味する。In this case, since the opening diameter restricting member 40 having the opening diameter restricting opening 42 is sandwiched between the sliding blades 20 and 30, the light receiving openings 12 of the main plate 10 and the pressing plate 50. Even if the lens frame of the lens is inserted in 52, 52, the open diameter can be configured. This means that the required width of the diaphragm device can be reduced.
【００２７】 上記実施例では、開放径規制部材４０を第１，第２の羽根２０，３０の間に挟 んだが、第１の羽根２０又は第２の羽根３０の外側に摺接する開放径用の開口４ ２を有する開放径規制部材４０を配置した構成とすることもできる。即ち、第１ の羽根２０又は第２の羽根３０と地板１０又は押え板５０との間に、開放径規制 部材３０を配置しても良い。かかる構成の下でも、地板１０の受光開口１２や押 え板５０の受光開口５２で開放径を形づくる場合よりも、より内側に羽根４０の 開口４２が来るため、上記のシェーデイングを防止し、或いは実際開放径位置と レンズ設計上の基準位置との誤差を少なくする上で有効である。In the above-described embodiment, the opening diameter restricting member 40 is sandwiched between the first and second blades 20 and 30, but for the opening diameter that is slidably contacted with the outer side of the first blade 20 or the second blade 30. The opening diameter regulating member 40 having the opening 42 may be arranged. That is, the open diameter regulating member 30 may be arranged between the first blade 20 or the second blade 30 and the base plate 10 or the pressing plate 50. Even under such a configuration, the shading is prevented because the opening 42 of the blade 40 is located more inside than when the opening diameter is formed by the light receiving opening 12 of the main plate 10 or the light receiving opening 52 of the holding plate 50. Alternatively, it is effective in reducing the error between the actual open diameter position and the reference position in lens design.
【００２８】 なお上記実施例ではビデオカメラの絞り装置を例にしたが、本装置はスチルカ メラにも適用することができる。In the above embodiment, the diaphragm device of the video camera is taken as an example, but this device can be applied to a still camera.
【００２９】[0029]
以上要するに本考案によれば、次のような優れた効果が得られる。 In summary, according to the present invention, the following excellent effects can be obtained.
【００３０】 （１）小絞り状態になった時、可動羽根と開放径とのすき間が少ないためシェ ーディングを防止することことができる。(1) When in a small aperture state, since there is little clearance between the movable blade and the open diameter, it is possible to prevent shading.
【００３１】 （２）前玉レンズと後玉レンズの間に入る開放径は、固定羽根の開口だけで規 制されるため、開放径位置をレンズ設計上の基準位置に一致させ、ＣＣＤに入る 光の領域を一定化することができる。(2) Since the open diameter between the front lens and the rear lens is limited only by the openings of the fixed blades, the open diameter position is made to coincide with the reference position for lens design, and then the CCD enters the CCD. The area of light can be made constant.
【００３２】 （３）絞り装置の外形を形作っている部分に開放径となる開口を持たないため 、レンズの鏡筒部を接触させることができ、絞り装置が必要とする幅を縮めるこ とができる。(3) Since the portion forming the outer shape of the diaphragm has no opening having an open diameter, the lens barrel of the lens can be brought into contact with the diaphragm, and the width required by the diaphragm can be reduced. it can.
【図１】本考案の一実施例における絞り装置の押え板を
除去した正面図である。FIG. 1 is a front view of a diaphragm device according to an embodiment of the present invention with a holding plate removed.
【図２】同じく絞り装置を構成する地板の正面図であ
る。FIG. 2 is a front view of a base plate which also constitutes the diaphragm device.
【図３】図２の地板の断面図である。3 is a cross-sectional view of the main plate of FIG.
【図４】図２の地板の背面図である。FIG. 4 is a rear view of the main plate of FIG.
【図５】図１の実施例の絞り装置を構成する第１の羽根
の形状を示す図である。5 is a diagram showing the shape of the first blade of the diaphragm device of the embodiment of FIG.
【図６】開放径規制部材の形状を示す図である。FIG. 6 is a view showing the shape of an open diameter regulating member.
【図７】第２の羽根の形状を示す図である。FIG. 7 is a diagram showing a shape of a second blade.
【図８】図１の実施例の絞り装置を構成する押え板の正
面図である。8 is a front view of a holding plate that constitutes the diaphragm device of the embodiment of FIG. 1. FIG.
【図９】図８の押え板の側面図である。9 is a side view of the holding plate of FIG. 8. FIG.
【図１０】従来のビデオカメラにおける絞り装置を示し
た図である。FIG. 10 is a diagram showing a diaphragm device in a conventional video camera.
２ 電磁的駆動装置 ２ａ 取付穴 ７ 作動レバー ８，９ 駆動ピン １０ 第１のガイド板としての地板 １２ 受光開口 １４,１５ ガイドピン １６，１７ 支持突起 １８ 係合突起 １９ 固定穴 ２０ 第１の羽根 ２１ ガイド穴 ２２ 切欠 ２３ ピン穴 ２４ 最大円 ３０ 第２の羽根 ３１ ガイド穴 ３２ 切欠 ３３ ピン穴 ３４ 最大円 ４０ 開放径規制部材 ４２ 開放径規制開口 ４４，４５ 位置決め孔 ５０ 第２のガイド板としての押さえ板 ５１ 切欠凹所 ５２ 受光開口 ５３ スリット ５４，５５ ピン穴 ５６，５７ 支持突起 ５８ 係合耳部 ５８ａ 係合耳部の穴 2 Electromagnetic drive device 2a Mounting hole 7 Actuating lever 8, 9 Drive pin 10 Base plate as first guide plate 12 Light receiving opening 14, 15 Guide pin 16, 17 Support protrusion 18 Engagement protrusion 19 Fixing hole 20 First blade 21 guide hole 22 notch 23 pin hole 24 maximum circle 30 second blade 31 guide hole 32 notch 33 pin hole 34 maximum circle 40 open diameter restricting member 42 open diameter restricting opening 44, 45 positioning hole 50 as second guide plate Pressing plate 51 Notch recess 52 Light receiving opening 53 Slit 54,55 Pin hole 56,57 Support protrusion 58 Engagement ear portion 58a Engagement ear portion hole
Claims (3)
第２のガイド板間に第１,第２の羽根を相対的に逆方向
に移動自在に支持して前記受光開口を開閉するカメラの
絞り装置において、前記第１の羽根と第２の羽根との間
に、開放径規制用の開口を有する開放径規制部材を挟ん
だことを特徴とするカメラの絞り装置。1. A first device having a light receiving opening facing each other,
In a diaphragm device for a camera, which movably supports first and second blades in opposite directions between second guide plates to open and close the light receiving opening, the first blade and the second blade are provided. A diaphragm device for a camera, characterized in that an aperture diameter regulating member having an aperture for regulating the aperture diameter is sandwiched between the two.
第２のガイド板間に第１,第２の羽根を相対的に逆方向
に移動自在に支持して前記受光開口を開閉するカメラの
絞り装置において、前記第１の羽根又は第２の羽根と前
記ガイド板との間に、開放径規制用の開口を有する開放
規制部材を配置したことを特徴とするカメラの絞り装
置。2. A first device having light receiving openings facing each other,
A diaphragm apparatus for a camera, which movably supports first and second blades in a relatively opposite direction between second guide plates to open and close the light receiving opening, in the first blade or the second blade. A diaphragm device for a camera, wherein an opening restriction member having an opening for restricting an opening diameter is arranged between the guide plate and the guide plate.
羽根を移動自在に支持する支持部材で支持したことを特
徴とする請求項１又は２記載のカメラの絞り装置。3. The diaphragm device for a camera according to claim 1, wherein the opening diameter regulating member is supported by a supporting member that movably supports the first and second blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3513193U JPH0687940U (en) | 1993-06-02 | 1993-06-02 | Camera diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3513193U JPH0687940U (en) | 1993-06-02 | 1993-06-02 | Camera diaphragm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0687940U true JPH0687940U (en) | 1994-12-22 |
Family
ID=12433381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3513193U Pending JPH0687940U (en) | 1993-06-02 | 1993-06-02 | Camera diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0687940U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006138971A (en) * | 2004-11-11 | 2006-06-01 | Seiko Precision Inc | Sector driving device |
-
1993
- 1993-06-02 JP JP3513193U patent/JPH0687940U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006138971A (en) * | 2004-11-11 | 2006-06-01 | Seiko Precision Inc | Sector driving device |
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