JP2607702B2 - Light intensity adjustment device - Google Patents
Light intensity adjustment deviceInfo
- Publication number
- JP2607702B2 JP2607702B2 JP28527689A JP28527689A JP2607702B2 JP 2607702 B2 JP2607702 B2 JP 2607702B2 JP 28527689 A JP28527689 A JP 28527689A JP 28527689 A JP28527689 A JP 28527689A JP 2607702 B2 JP2607702 B2 JP 2607702B2
- Authority
- JP
- Japan
- Prior art keywords
- filter
- edge
- aperture
- curved surface
- blade
- 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.)
- Expired - Lifetime
Links
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- Diaphragms For Cameras (AREA)
- Blocking Light For Cameras (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、ビデオカメラ等の撮影装置に使用される
光量調整装置すなわち絞り装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light amount adjusting device, that is, a diaphragm device used in a photographing device such as a video camera.
［従来の技術］ 最近のビデオカメラでは、従来用いられていた撮影管
に代ってCCD等の固体撮像素子が用いられるようにな
り、従来のビデオカメラよりも感度が高くなっている。
従って、晴天時の撮影や高輝度の被写体を撮影する時に
は絞りを小絞りにしなければならないのでハンチング現
像が発生しやすくなり、また、小絞り状態では光の回折
により像の劣化が生じるという問題があった。[Related Art] In a recent video camera, a solid-state imaging device such as a CCD has been used in place of a conventionally used photographing tube, and the sensitivity is higher than that of a conventional video camera.
Therefore, when shooting on a sunny day or when shooting a high-brightness subject, the aperture must be set to a small aperture, so that hunting development is likely to occur. there were.
それ故、ハンチング現象や像劣化を防止するために、
全体が偏平且つ平坦なフィルム状のNDフィルターを絞り
羽根に接着した構造の絞り装置が提案され、該絞り装置
が市販のビデオカメラに搭載されている。Therefore, in order to prevent hunting phenomenon and image deterioration,
A diaphragm device having a structure in which a flat and flat film-like ND filter is adhered to diaphragm blades has been proposed, and the diaphragm device is mounted on a commercially available video camera.
しかしながら、ズームレンズではＦナンバーを決定す
る絞りはアフォーカル光束部にあることが多く、また、
固体撮像素子の光入射面の反射率が高いので、前記公知
の絞り装置を搭載したビデオカメラにおいては、固体撮
像素子の面で反射した光束が該NDフィルターに入射して
再反射し、この再反射光束が再び該固体撮像素子に入射
するためゴーストが発生するという欠点があった。However, in a zoom lens, the aperture for determining the F number is often located in the afocal light beam portion.
Since the reflectance of the light incident surface of the solid-state imaging device is high, in a video camera equipped with the known aperture device, the light beam reflected on the surface of the solid-state imaging device is incident on the ND filter and is reflected again. There is a disadvantage that a ghost is generated because the reflected light flux is incident on the solid-state imaging device again.
そこで本出願人はゴーストを発生する恐れのない、改
良された絞り装置を提案している。Therefore, the present applicant has proposed an improved diaphragm device which does not cause ghosting.
第４図及び第５図は本出願人により提案されている上
述の絞り装置の概略構造及び部分構造を示したものであ
る。FIGS. 4 and 5 show a schematic structure and a partial structure of the above-described diaphragm device proposed by the present applicant.
第４図において、１は絞り装置筺体もしくは主フレー
ムを構成している地板、２は軸2aを有するとともに地板
１の外面に固定されているモータ、３はモータ軸2aと嵌
合する孔3aを有しているボス部3bを具備した絞り羽根駆
動レバーである。該レバー３の両端にはボス部3bと平行
にピン3c及び3dが突設されており、ピン3c及び3dは後述
の一対の絞り羽根の溝内にそれぞれ相対摺動可能に挿入
されるようになっている。In FIG. 4, reference numeral 1 denotes a main plate forming a diaphragm device housing or a main frame, 2 denotes a motor having a shaft 2a and fixed to the outer surface of the main plate 1, and 3 denotes a hole 3a to be fitted with the motor shaft 2a. This is a diaphragm blade drive lever having a boss 3b. Pins 3c and 3d are projected from both ends of the lever 3 in parallel with the boss 3b so that the pins 3c and 3d are inserted into grooves of a pair of aperture blades described later so as to be relatively slidable. Has become.
４及び５は地板１の面1a上を矢印ｆ方向に摺動する２
枚の絞り羽根であり、絞り羽根４及び５のそれぞれの一
端部には前記レバー３のピン3cが挿入される溝4aとピン
3dが挿入される溝5aとが貫設されている。また、絞り羽
根4aの一方の側縁には絞り羽根の移動方向と平行な一対
の溝4b及び4cが貫設されており、地板１の面1a上に突設
されている２本のガイドピン1a及び1cのうちの一方1bが
溝4b内に挿入され、他方のガイドピン1cが溝4c内に挿入
されるようになっている。4 and 5 slide on the surface 1a of the main plate 1 in the direction of arrow f.
A groove 4a into which the pin 3c of the lever 3 is inserted is provided at one end of each of the diaphragm blades 4 and 5.
A groove 5a into which 3d is inserted is provided through. A pair of grooves 4b and 4c are formed in one side edge of the diaphragm blade 4a in parallel with the moving direction of the diaphragm blade, and two guide pins projecting from the surface 1a of the main plate 1 are provided. One 1b of 1a and 1c is inserted into the groove 4b, and the other guide pin 1c is inserted into the groove 4c.
絞り羽根５の一方の側縁にも該絞り羽根の移動方向と
平行な一対の溝5b及び5cが貫設されており、地板１の面
1a上に突設された２本のガイドピン（このガイドピンは
第４図では地板１の手前側の側壁によって隠されている
ので見えない）のうち一方が溝5bに挿入され、他方のガ
イドピンが溝5cに挿入されるようになっている。A pair of grooves 5b and 5c, which are parallel to the moving direction of the diaphragm blade, are also provided through one side edge of the diaphragm blade 5, and
One of the two guide pins projecting above 1a (this guide pin is not visible in FIG. 4 because it is hidden by the side wall on the near side of the base plate 1) is inserted into the groove 5b, and the other guide pin is inserted. A pin is inserted into the groove 5c.
絞り羽根４の開口4dの尖鋭部（開口の輪郭曲線の交又
部）には第５図に示した平面形状のNDフィルター６がそ
の一部6aにおいて絞り羽根４に接着されている。該NDフ
ィルター６は、先端の平面的輪郭が円弧であって面方向
には湾曲した曲面として構成された湾曲面部分6bと、孔
6cが貫設されるととも該湾曲面部分6bから後方に向って
一様に巾が減少してゆくように構成された後方部分6d
と、から成っている。そして、該湾曲面部分6bを絞り羽
根４の開口4dの中に突出させるように該NDフィルター６
が絞り羽根４に位置決めされ、該後方部分6dの最後尾近
傍の部分6aにおいて絞り羽根４に接着剤で接着されてい
る。The ND filter 6 having a planar shape shown in FIG. 5 is adhered to the aperture blade 4 at a part 6a of the sharp portion of the aperture 4d of the aperture blade 4 (the intersection of the contour curves of the aperture). The ND filter 6 has a curved surface portion 6b, which is formed as a curved surface curved in the surface direction with a planar contour at the tip being an arc, and a hole.
The rear portion 6d is configured such that the width is uniformly reduced rearward from the curved surface portion 6b as the 6c is penetrated.
And it consists of Then, the ND filter 6 is made to project the curved surface portion 6b into the opening 4d of the diaphragm blade 4.
Is positioned on the diaphragm blade 4, and is adhered to the diaphragm blade 4 with an adhesive at a portion 6a near the rear end of the rear portion 6d.
［発明が解決しようとする課題］ 前述のNDフィルター付き絞り装置を搭載したビデオカ
メラでは、該NDフィルターへ入射してきた固体撮像素子
反射光が該NDフィルターの該湾曲面部で散乱されて固体
撮像素子への再入射が防止されるのでゴーストを発生す
る恐れが完全に取除かれているが、前述の絞り装置に
も、NDフィルターの形状やその製造コストなどの面にお
いて更に改善するべき次のような問題点があった。[Problems to be Solved by the Invention] In a video camera equipped with the above-mentioned diaphragm device with an ND filter, the solid-state imaging device reflected light incident on the ND filter is scattered by the curved surface portion of the ND filter, and Although the possibility of ghosting is completely eliminated because re-incidence is prevented, the aperture device described above must be further improved in terms of the shape of the ND filter and its manufacturing cost as follows. There were serious problems.
（ｉ） 前述の湾曲面付きNDフイルター６を製造する場
合、平らなポリエチレン製NDフィルター素材から打抜き
加工によって平坦なフィルター素片を製造した後、該素
片を恒温恒湿槽に所定時間入れることによって該素片に
湾曲面部を形成していたが、このような製造方法では時
間がかゝる上、該素片を固定しておくための治具や恒温
恒湿槽などの設備費及び運転費がかゝるので、該NDフィ
ルターの製造コストがかなり高価になるという問題点が
あった。(I) When manufacturing the above-mentioned ND filter 6 with a curved surface, after manufacturing a flat filter element from a flat polyethylene ND filter material by punching, put the element into a thermo-hygrostat for a predetermined time. However, such a manufacturing method takes a long time, and equipment costs and operation of a jig and a constant temperature / humidity bath for fixing the element are required. Since the cost is high, there is a problem that the manufacturing cost of the ND filter is considerably high.
（ii） 前述のNDフイルター６はポリエチレン製であり
絞り羽根４は金属製であるため、該NDフィルターの熱膨
張係数と絞り羽根の熱膨張係数との間には大きな開きが
ある。従って、仮りに該NDフィルターと絞り羽根との相
互接触面全体に接着剤を塗布して両者を接合した場合、
周囲温度が変化すると該NDフィルターには種々の方向へ
大きな引張応力や圧縮応力が生じ、該NDフィルターは原
形を保ち得ぬ程に変形してしまったり、破れてしまう危
険性があった。(Ii) Since the ND filter 6 is made of polyethylene and the diaphragm blade 4 is made of metal, there is a large difference between the thermal expansion coefficient of the ND filter and the thermal expansion coefficient of the diaphragm blade. Therefore, if an adhesive is applied to the entire mutual contact surface between the ND filter and the aperture blade and the two are joined,
When the ambient temperature changes, a large tensile stress and a large compressive stress are generated in the ND filter in various directions, and there is a risk that the ND filter is deformed or broken so that it cannot maintain its original shape.
それ故、このような危険性を回避する目的で該絞り装
置では該NDフィルターがその最後尾近傍の部分6aのみに
おいて絞り羽根４に接着され、また、該NDフィルターに
生ずる応力分布をできるだけ平均化するために該NDフィ
ルターの後方部分には孔6cが貫設されている。Therefore, in order to avoid such a risk, in the diaphragm device, the ND filter is adhered to the diaphragm blade 4 only in the portion 6a near the rear end thereof, and the stress distribution generated in the ND filter is averaged as much as possible. For this purpose, a hole 6c is provided in the rear part of the ND filter.
しかしながら、該NDフィルターの場合もその多くの部
分が絞り羽根４の表面に密着しているため、該NDフィル
ターの大部分が絞り羽根４に接着されていなくても、周
囲温度が変動した時には両者の間には両者の相対摺動に
よる摩擦力が生じ、該摩擦力によって該NDフィルターが
種々の方向へ引張られたり、縮められたりして変形する
危険性があった。However, even in the case of the ND filter, since most of the ND filter is in close contact with the surface of the diaphragm blade 4, even when most of the ND filter is not adhered to the diaphragm blade 4, when the ambient temperature fluctuates, both of the ND filters do not adhere. Between them, a frictional force is generated due to relative sliding between the two, and there is a risk that the ND filter is deformed by being pulled or shrunk in various directions by the frictional force.
第６図は、絞り羽根４に対してNDフィルターが接着さ
れている部分6aを原点としてNDフィルター６の縦方向の
位置をＹ軸にとり、周囲温度が変化した時にNDフィルタ
ー６に生ずる応力を横軸にとって該NDフィルターの応力
分布を表わしたものである。FIG. 6 shows the vertical position of the ND filter 6 on the Y axis with the portion 6a where the ND filter is adhered to the diaphragm blade 4 as the origin, and shows the stress generated in the ND filter 6 when the ambient temperature changes. The axis represents the stress distribution of the ND filter.
同図に示すように、NDフィルター６の湾曲面部6bと絞
り羽根４とが接触する最も端の位置Y4では応力は０とな
るが、位置Y2と位置Y4との間の応力は相当に大きいた
め、湾曲面部6bが変形しやすいことがわかる。As shown in the figure, the position Y 4 in stress endmost curved surface portion 6b and the diaphragm blade 4 contacts the ND filter 6 becomes zero, stress between the position Y 2 and the position Y 4 are equivalent It can be seen that the curved surface portion 6b is easily deformed.
従って、本発明の目的は、前記（ｉ）及び（ii）に記
載した問題を解決しうる、改善された絞り装置を提供す
ることである。Accordingly, it is an object of the present invention to provide an improved diaphragm device that can solve the problems described in (i) and (ii) above.
［課題を解決するための手段］ 上記の目的を達成するため、本願発明では、光量調整
のための絞り羽根の開口の中に突出するように該絞り羽
根にNDフィルターが取付けられた光量調整装置におい
て、該NDフィルターが、該開口の中に突出する湾曲面部
と、該湾曲部の巾よりも狭い巾を有するとともに該湾曲
面部に連って後方へ延在する一定巾の後方部分とを有す
る場合に、該湾曲面部に、該NDフィルターの長手方向中
心線に関して対称に左右方向へ延在する左後縁部及び右
後縁部を設け、該左後縁部及び該右後縁部を該絞り羽根
の該開口の縁部の後方において該縁部と平行になるよう
に位置決めするとともに、該左後縁部と該開口の縁部と
の間隔を該右後縁部と該開口の縁部との間隔に等しく
し、さらに該後方部分に穴を貫設して、該穴よりも後方
の位置において該後方部分を該絞り羽根に固着してい
る。Means for Solving the Problems In order to achieve the above object, according to the present invention, a light amount adjusting device in which an ND filter is mounted on an aperture blade for projecting into an aperture of the aperture blade for adjusting the light amount is provided. Wherein the ND filter has a curved surface protruding into the opening, and a rear portion having a fixed width smaller than the width of the curved portion and extending rearward along the curved surface. In this case, the curved surface portion is provided with a left rear edge and a right rear edge extending symmetrically with respect to a longitudinal center line of the ND filter in the left-right direction, and the left rear edge and the right rear edge are provided. The aperture blade is positioned behind the edge of the opening so as to be parallel to the edge, and the distance between the left rear edge and the edge of the opening is set to the right rear edge and the edge of the opening. And a hole is provided in the rear part so that the The rear portion is fixed to the diaphragm blade at a rear position.
すなわち、本発明では、前記（ｉ）の問題を解決する
ために、従来の製造方法（すなわち、打抜きによって作
られたポリエチレン製素片の所定の部分に吸湿されるこ
とによって湾曲させる方法）に代り、該素片の打抜き成
形と同時に行われる押し曲げによって該素片に湾曲面部
を形成するという製造方法を採用し、これにより、NDフ
ィルターの製造コストを大巾に低減させることができ
る。That is, in the present invention, in order to solve the above-mentioned problem (i), instead of the conventional manufacturing method (that is, a method in which a predetermined portion of a polyethylene piece made by punching is bent by absorbing moisture). In addition, a manufacturing method is employed in which a curved surface portion is formed on the element by pressing and bending performed at the same time as the punching and molding of the element, whereby the manufacturing cost of the ND filter can be significantly reduced.
また、本発明では前記（ii）の問題を解決するため
に、変形が起りにくい形状のNDフィルターを開発した。
本発明の絞り装置に取付けられるNDフィルターは第６図
の如き応力分布を改善する目的を以て開発されたもので
あり、従来のNDフィルターよりも変形しにくい形状とな
っている。Further, in order to solve the above-mentioned problem (ii), the present invention has developed an ND filter having a shape that is hardly deformed.
The ND filter attached to the diaphragm device of the present invention has been developed with the purpose of improving the stress distribution as shown in FIG. 6, and has a shape that is more difficult to deform than a conventional ND filter.
［実 施 例］ 以下に第１図乃至第３図を参照して本発明の実施例を
説明する。なお、第３図において第４図の同じ符号で表
示されている部材は前述した従来の絞り装置と同じ構成
部材であるから、この同じ構成部材の説明を省略する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In FIG. 3, the members denoted by the same reference numerals in FIG. 4 are the same components as those of the above-described conventional diaphragm device, and the description of the same components will be omitted.
第１図において、４は絞り羽根、７は絞り羽根４に取
付けられたNDフィルターである。In FIG. 1, reference numeral 4 denotes an aperture blade, and 7 denotes an ND filter mounted on the aperture blade 4.
NDフィルター７は、絞り羽根４の開口内に突出するよ
うに位置決めされた湾曲面部7aと、該湾曲面部7aの後方
に連って形成された一定巾の後方部7bと、によって構成
されており、該後方部7bには孔7cが貫設され、該後方部
7bの最後端近くの部分7dのみが接着剤で絞り羽根４に接
着されている。The ND filter 7 includes a curved surface portion 7a positioned so as to protrude into the opening of the diaphragm blade 4, and a constant width rear portion 7b formed behind the curved surface portion 7a. The rear portion 7b is provided with a hole 7c therethrough.
Only the portion 7d near the rear end of 7b is adhered to the diaphragm blade 4 with an adhesive.
湾曲面部7aの後端縁7e及び7fは第１図及び第２図に示
すように絞り羽根４の開口4dの縁部と平行になってお
り、NDフィルター７を絞り羽根４に取付ける際には該後
端縁部7e及び7fと絞り羽根４の開口4dの縁部との間隔が
第１図に示すように一定値Ｗとなるように該NDフィルタ
ーが位置決めされる。The rear edges 7e and 7f of the curved surface portion 7a are parallel to the edge of the opening 4d of the diaphragm blade 4 as shown in FIGS. 1 and 2, and when the ND filter 7 is mounted on the diaphragm blade 4, The ND filter is positioned so that the distance between the rear edge portions 7e and 7f and the edge portion of the opening 4d of the diaphragm blade 4 becomes a constant value W as shown in FIG.
第２図は前述のNDフィルター７を絞り羽根４に取付け
た状態での、該NDフィルター７の応力分布を示した図で
あり、第６図と同じく縦軸はNDフィルター７の縦方向の
位置Ｙを表わし、横軸はNDフィルターの応力を表わして
いる。FIG. 2 is a view showing the stress distribution of the ND filter 7 in a state where the ND filter 7 is attached to the diaphragm blade 4, and the vertical axis is the vertical position of the ND filter 7 as in FIG. Y represents the abscissa, and the horizontal axis represents the stress of the ND filter.
第２図に示されるように、前述の如きNDフィルター７
を取付けた絞り羽根では該NDフィルターの応力分布がY2
位置からY4位置の間で従来のNDフィルターの応力分布
（第６図）とくらべて著しく改善されていることがわか
る。すなわち、本発明の絞り装置ではNDフィルター７に
変形を生ずる恐れが従来の絞り装置にくらべて非常に小
さくなっている。As shown in FIG. 2, the ND filter 7 as described above is used.
In the diaphragm blade equipped with, the stress distribution of the ND filter is Y 2
It can be seen that significantly improved as compared with the stress distribution of the conventional ND filter between Y 4 position (FIG. 6) from the position. That is, in the aperture device according to the present invention, the possibility that the ND filter 7 is deformed is much smaller than in the conventional aperture device.
前述のNDフィルター７は本発明の場合、打抜き加工及
びそれと同時にもしくは引き続いて行なわれる押し曲げ
加工によって製造される。すなわち、NDフィルターの素
材であるポリエチレンシートから第２図に示す如き輪郭
のフィルター素片を打抜くと同時に孔7cを打抜き、この
打抜きと同時にもしくは打抜きに引き続いて該素片の円
形状の頭部を押しで曲げ加工することによって湾曲面部
7aを形成する。従って、本発明の絞り装置では、NDフィ
ルターを従来よりも著しく安いコストで製造することが
できるので絞り装置のコストも低減することができる。In the case of the present invention, the above-mentioned ND filter 7 is manufactured by stamping and simultaneous or subsequent pressing and bending. That is, a filter piece having a contour as shown in FIG. 2 was punched out of a polyethylene sheet as a material of the ND filter, and at the same time, a hole 7c was punched out. By pressing and bending the curved surface part
Form 7a. Therefore, in the diaphragm device of the present invention, the cost of the diaphragm device can be reduced because the ND filter can be manufactured at a significantly lower cost than in the past.
なお、NDフィルター７を絞り羽根４に固定する方法と
して接着剤によらずに超音波溶接などによって固定を行
なってもよい。The ND filter 7 may be fixed to the diaphragm blade 4 by ultrasonic welding or the like without using an adhesive.
［発明の効果］ 以上説明したように、本願発明では、NDフィルターの
湾曲面部に、該NDフィルターの長手方向中心線に関して
対称に左右方向へ延在する左後縁部及び右後縁部を設
け、該左後縁部及び該右後縁部を該絞り羽根の該開口の
縁部の後方において該縁部と平行になるように位置決め
するとともに、該左後縁部と該開口の縁部との間隔を該
右後縁部と該開口の縁部との間隔に等しくし、さらに該
後方部分に穴を貫設して、該穴よりも後方の位置におい
て該後方部分を該絞り羽根に固着するようにしている。
すなわち、本願発明では、NDフィルターの形状を素材の
打ち抜き加工とこれと同時に行われる押し曲げ加工とに
よって成形できるものとしている。このため、本発明に
おける光量調整装置すなわち絞り装置には、従来の絞り
装置に設けられているNDフィルターよりも変形する恐れ
が少なく、且つ、従来のNDフィルターよりも安価なコス
トで製造できるNDフィルターが取付けられているので、
本発明によれば、従来の絞り装置よりも高い歩留りで製
造することができ、また、安価なコストで製造すること
ができる絞り装置を提供することができる。[Effects of the Invention] As described above, in the present invention, a left rear edge and a right rear edge are provided on the curved surface of the ND filter so as to extend in the left-right direction symmetrically with respect to the longitudinal center line of the ND filter. Positioning the left rear edge and the right rear edge behind the edge of the aperture of the aperture blade so as to be parallel to the edge, and the left rear edge and the edge of the opening Is equal to the distance between the right rear edge and the edge of the opening, and a hole is provided in the rear portion, and the rear portion is fixed to the diaphragm blade at a position behind the hole. I am trying to do it.
That is, according to the present invention, the shape of the ND filter can be formed by punching the material and simultaneously performing the pressing and bending. For this reason, the light amount adjusting device or the aperture device according to the present invention is less likely to be deformed than the ND filter provided in the conventional aperture device, and can be manufactured at a lower cost than the conventional ND filter. Is installed,
According to the present invention, it is possible to provide a diaphragm device that can be manufactured with a higher yield than a conventional diaphragm device and that can be manufactured at low cost.
第１図は本発明による光量調整装置の絞り羽根と該絞り
羽根に取付けられたNDフィルターの正面図、第２図は該
絞り羽根に該NDフィルターが取付けられている状態での
該NDフィルターに生ずる応力分布を示した図、第３図は
第２図のNDフィルターを有した本発明の光量調整装置の
分解斜視図、第４図は従来の光量調整装置の分解斜視
図、第５図は（ａ）は第４図の光量調整装置に用いられ
ている従来のNDフィルターの正面図、第５図（ｂ）は第
５図（ａ）のｂ−ｂ矢視断面図、第６図は絞り羽根に取
付けられた状態における該NDフィルター６の応力分布を
示した図、である。 １……地板、２……モータ ３……絞り羽根駆動レバー 4,5……絞り羽根、6,7……NDフィルター 4d……（絞り羽根４の）開口 7a……湾曲面部、7b……後方部分 7f,7e……湾曲面部の後縁部FIG. 1 is a front view of an aperture blade and an ND filter attached to the aperture blade of the light amount adjusting device according to the present invention, and FIG. 2 shows the ND filter in a state where the ND filter is mounted on the aperture blade. FIG. 3 is an exploded perspective view of a light amount adjusting device of the present invention having the ND filter of FIG. 2, FIG. 4 is an exploded perspective view of a conventional light amount adjusting device, and FIG. (A) is a front view of a conventional ND filter used in the light amount adjusting device of FIG. 4, FIG. 5 (b) is a sectional view taken along the line bb of FIG. 5 (a), and FIG. FIG. 5 is a diagram showing a stress distribution of the ND filter 6 in a state where the ND filter 6 is attached to an aperture blade. 1 ... Base plate, 2 ... Motor 3 ... Aperture blade drive lever 4,5 ... Aperture blade, 6, 7 ... ND filter 4d ... Opening (of aperture blade 4) 7a ... ... Curved surface, 7b ... Rear part 7f, 7e …… Rear edge of curved surface
Claims (1)
出するように該絞り羽根にNDフィルターが取付けられた
光量調整装置において、 該NDフィルターは、該開口の中に突出する湾曲面部と、
該湾曲面部の巾よりも狭い巾を有するとともに該湾曲面
部に連って後方へ延在する一定巾の後方部分と、を有し
ており、 該湾曲面部は、該NDフィルターの長手方向中心線に関し
て対称に左右方向へ延在する左後縁部及び右後縁部を有
し、該左後縁部及び該右後縁部は該絞り羽根の該開口の
縁部の後方において該縁部と平行になるように位置決め
されるとともに、該左後縁部と該開口の縁部との間隔が
該右後縁部と該開口の縁部との間隔に等しくなってお
り、 該後方部分には穴が貫設され、該穴よりも後方の位置に
おいて該後方部分が該絞り羽根に固着されていることを
特徴とする光量調整装置。1. A light amount adjusting device in which an ND filter is mounted on an aperture blade so as to protrude into an opening of the aperture blade for adjusting the amount of light, wherein the ND filter has a curved surface protruding into the opening. When,
A rear portion having a fixed width that is narrower than the width of the curved surface portion and extends rearward following the curved surface portion; and the curved surface portion has a longitudinal centerline of the ND filter. A left trailing edge and a right trailing edge extending symmetrically with respect to the left and right trailing edges, the left trailing edge and the right trailing edge being located behind the edge of the aperture of the diaphragm blade. Positioned so as to be parallel, the interval between the left rear edge and the edge of the opening is equal to the interval between the right rear edge and the edge of the opening, and the rear portion has A light amount adjusting device, characterized in that a hole is penetrated and the rear portion is fixed to the diaphragm blade at a position behind the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28527689A JP2607702B2 (en) | 1989-11-01 | 1989-11-01 | Light intensity adjustment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28527689A JP2607702B2 (en) | 1989-11-01 | 1989-11-01 | Light intensity adjustment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03145631A JPH03145631A (en) | 1991-06-20 |
| JP2607702B2 true JP2607702B2 (en) | 1997-05-07 |
Family
ID=17689417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28527689A Expired - Lifetime JP2607702B2 (en) | 1989-11-01 | 1989-11-01 | Light intensity adjustment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2607702B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100520557C (en) * | 2006-05-23 | 2009-07-29 | 佳能株式会社 | Optical apparatus |
| JP2008216379A (en) * | 2007-02-28 | 2008-09-18 | Nisca Corp | Method of molding nd filter, nd filter molded by the method, and light quantity adjustment device using the nd filter |
-
1989
- 1989-11-01 JP JP28527689A patent/JP2607702B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03145631A (en) | 1991-06-20 |
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