JP2592949B2 - Aperture device - Google Patents
Aperture deviceInfo
- Publication number
- JP2592949B2 JP2592949B2 JP1011381A JP1138189A JP2592949B2 JP 2592949 B2 JP2592949 B2 JP 2592949B2 JP 1011381 A JP1011381 A JP 1011381A JP 1138189 A JP1138189 A JP 1138189A JP 2592949 B2 JP2592949 B2 JP 2592949B2
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- filter
- blade
- aperture
- diaphragm 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
Landscapes
- Diaphragms For Cameras (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ビデオカメラ等の撮影機器に装備される絞
り装置、特に光量調整の為のND（ニュートラル・デンシ
ティ）等のフィルタを有する絞り装置の改良に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a diaphragm device provided in a photographing device such as a video camera, and particularly to a diaphragm device having a filter such as an ND (neutral density) for adjusting a light amount. It is related to the improvement of.
従来の絞り装置は実開昭60−23697号公報にて知られ
ているように、小絞り補正の為、F8〜F11程度の絞り口
径を覆うようにNDフィルタが貼付あるいは配置されてい
る。As disclosed in Japanese Utility Model Laid-Open Publication No. Sho 60-23697, a conventional aperture device has an ND filter attached or disposed so as to cover an aperture diameter of about F8 to F11 for small aperture correction.
しかしながら上記従来例では、NDフィルタを使用して
いる為、F8〜F11より小絞りに対して一様の光量補正に
なってしまうため次のような欠点があった。However, in the above-described conventional example, since the ND filter is used, the light amount is uniformly corrected for a smaller aperture than F8 to F11.
すなわち、絞り口径は、NDフィルタで光量を減らした
分だけ大きくなるが、各Ｆ値間の絞り羽根の動きは、ND
フィルタ無しのものに比べて大きな差がない為、高輝度
でのハンチングが発生する。In other words, the aperture diameter is increased by the amount of light reduced by the ND filter, but the movement of the aperture blade between each F value is ND
Since there is no large difference as compared with the case without the filter, hunting at high luminance occurs.
絞り羽根により形成される絞り開口内に位置するよう
に絞り羽根に取り付けられるフィルタ部材が絞り羽根に
取り付けられるものであって、フィルタ部材はそれぞれ
が均一な透過率に設定された複数の領域を有し、該領域
は絞り開口の外側から内側に向かって順に透過率が大き
くなるように設定され、該領域の境界が絞り羽根の移動
方向と直交するようにフィルタ部材を絞り羽根に取り付
けられることを特徴とする。A filter member attached to the aperture blade is attached to the aperture blade so as to be located within an aperture opening formed by the aperture blade, and the filter member has a plurality of regions each having a uniform transmittance. The region is set so that the transmittance increases in order from the outside to the inside of the diaphragm opening, and the filter member is attached to the diaphragm blade so that the boundary of the region is orthogonal to the moving direction of the diaphragm blade. Features.
第１図及び第２図は、本発明の実施例を示し、第１図
はこの実施例の特徴を最もよく表す図面であり、同図に
於いて２は透過光量を制御するところのフィルタ、３は
絞りの口径を構成する絞り羽根であり、絞り開口端3aを
有している。20は絞り羽根３にフィルタ２を貼付ける為
の接着剤である。FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a drawing that best illustrates the features of this embodiment. In FIG. 1, reference numeral 2 denotes a filter for controlling the amount of transmitted light; Reference numeral 3 denotes an aperture blade constituting the aperture of the aperture, and has an aperture opening end 3a. Reference numeral 20 denotes an adhesive for attaching the filter 2 to the diaphragm blade 3.
絞り羽根３の上記絞り開口端3aより光軸（中心）方向
Ａにある一定量はみ出る位置に設置されたフィルタ２の
部分2a（絞り羽根の端面より光路方向に突出した領域）
は、フィルタとして使用される部分で、第２図に示す様
に端面から光軸中心方向Ａに向っての距離０〜x1,x1〜x
2,x2〜x3の間がそれぞれ透過率α1,α2,α３の様に段階
的に変化するように形成されている。そして、この部分
2aはそれぞれの透過率がα１＞α２＞α３の順で、透過
率が変化するようになっており、絞り羽根３の口径部端
面x3側が透過率が小さくなる様設定されている。このた
め、絞り羽根３ともう一方の絞り羽根とによって構成さ
れる口径が、フィルタ２によって全体をカバーする様に
なったとき、通常のNDフィルタの場合では透過率が一定
の為、Ｆ値の変化に対する羽根の動きはF32以降はNDフ
ィルタなしのものと差がなくなってしまうが、本実施例
によればフィルタ２の透過率が段階的に変化している
為、Ｆ値の変化に対する羽根の動きが大きく改善されハ
ンチングに対して非常に有利になっている。A portion 2a of the filter 2 installed at a position protruding a predetermined amount in the optical axis (center) direction A from the aperture opening end 3a of the aperture blade 3 (a region protruding in the optical path direction from the end face of the aperture blade).
Is a portion to be used as a filter, the distance towards the end surface as shown in FIG. 2 in the optical axis center direction A 0~x 1, x 1 ~x
2, x 2, respectively transmittance alpha 1 is between ~x 3, α 2, α 3 are formed so as to change stepwise like. And this part
2a is a respective order of transmittance α 1> α 2> α 3 , the transmittance is controlled so as to change, diameter end face x 3 side of the diaphragm blade 3 is set such that the transmittance decreases . For this reason, when the aperture formed by the diaphragm blade 3 and the other diaphragm blade is entirely covered by the filter 2, the transmittance is constant in the case of a normal ND filter. Although the movement of the blade with respect to the change is no different from that without the ND filter after F32, according to the present embodiment, the transmittance of the filter 2 changes stepwise, so that the blade with respect to the change of the F value changes. The movement is greatly improved, which is very advantageous for hunting.
第３図は、FNOと絞り装置の駆動アーム（12）の振れ
角特性の例であり、フィルタ無しを表わすカーブＡが示
すようにF32〜F88にかけては、駆動アームがほんのわず
かしか動いていないことがわかる。これに対して従来の
NDフィルタ付を表わカーブＢはカーブＡに対して振れ角
が多少拡大されているが、F44を越すと変化が小さくな
っている。しかしながら本実施例のフィルタ２を表わす
特性カーブＣによれば、小絞りでの振れ角が大巾に広く
なるように改善されていることがわかる。たとえばF44
からF88の２段で比較するとフイルタ無しでは0.88deg程
度、NDフィルタ付で1.5deg程度、本実施例のフィルタ付
では、2.5deg程度になっている。このように拡大された
駆動アーム（12）の振れ角により小絞りでの駆動部
（５）の制御が容易になりハンチングを押えることがで
きる。FIG. 3 shows an example of the deflection angle characteristics of the FNO and the drive arm (12) of the aperture device. As shown by the curve A indicating no filter, the drive arm moves only slightly from F32 to F88. I understand. On the other hand,
The deflection angle of the curve B representing the with ND filter is slightly enlarged with respect to the curve A, but the change becomes smaller after F44. However, according to the characteristic curve C representing the filter 2 of the present embodiment, it can be seen that the deflection angle at a small aperture is improved so as to be greatly widened. For example, F44
From the comparison between the two stages of F88, it is about 0.88 deg without the filter, about 1.5 deg with the ND filter, and about 2.5 deg with the filter of this embodiment. The enlarged swing angle of the drive arm (12) makes it easy to control the drive unit (5) with a small aperture, thereby suppressing hunting.
以上説明したように、本発明によれば、絞り羽根によ
り形成される絞り開口内に位置するようにフィルタ部材
を絞り羽根に取り付けるもので、フィルタ部材を絞り羽
根に取り付ける際に絞り開口の外側から内側に向かって
順に透過率が大きくなるように取り付けることで、従来
の問題点である高輝度でのハンチングの発生を防止でき
る。そして、該フィルタ部材はそれぞれ均一な透過率に
設定された複数の領域を有するので、フィルタ部材の製
造が容易であって、フィルタ部材の透過率にバラツキが
生じることが少なく、フィルタ部材の品質管理も容易で
ある。As described above, according to the present invention, the filter member is attached to the diaphragm blade so as to be located within the diaphragm opening formed by the diaphragm blade. By mounting the transmission in such a manner that the transmittance increases in order toward the inside, it is possible to prevent hunting with high luminance, which is a conventional problem. Since the filter member has a plurality of regions each having a uniform transmittance, it is easy to manufacture the filter member, and the transmittance of the filter member is less likely to vary. Is also easy.
また、該領域の境界が該絞り羽根の移動方向と直交す
るように該フィルタ部材を該絞り羽根に取り付けられる
ことによって、フィルタ部材を絞り羽根に取り付ける際
に、絞り羽根に対するフィルタ部材の位置および移動方
向に対する取り付け角度がわかりやすく、位置精度を向
上させるとともに、絞り羽根の移動とＦ値の変化をより
滑らかにすることができる。Further, by attaching the filter member to the aperture blade so that the boundary of the region is orthogonal to the moving direction of the aperture blade, when the filter member is attached to the aperture blade, the position and movement of the filter member with respect to the aperture blade The mounting angle with respect to the direction can be easily understood, the positional accuracy can be improved, and the movement of the aperture blade and the change in the F value can be made smoother.
第１図は本発明の前提となる第１例の絞り羽根の斜視
図、 第２図は第１図のNDフィルタの透過率の変化を示すグラ
フ、 第３図は第１図の絞り羽根の用いた絞り装置の駆動アー
ムの振れ角特性を表わすグラフ、 ３・30……絞り羽根 120……NDフィルタFIG. 1 is a perspective view of a first example of an aperture blade as a premise of the present invention, FIG. 2 is a graph showing a change in transmittance of the ND filter of FIG. 1, and FIG. 3 is a diagram of the aperture blade of FIG. A graph showing the deflection angle characteristics of the drive arm of the used diaphragm device. 3.30… diaphragm blade 120 ND filter
Claims (1)
により絞り開口の大きさを変化する絞り羽根と、出力部
材の移動により該絞り羽根を駆動する駆動手段を備えた
絞り装置において、前記絞り羽根により形成される絞り
開口内に位置するように該絞り羽根に取り付けられるフ
ィルタ部材が該絞り羽根に取り付けられるものであっ
て、該フィルタ部材はそれぞれが均一な透過率に設定さ
れた複数の領域を有し、該領域は該絞り開口の外側から
内側に向かって順に透過率が大きくなるように設定さ
れ、該領域の境界が該絞り羽根の移動方向と直交するよ
うに該フィルタ部材を該絞り羽根に取り付けられること
を特徴とする絞り装置。1. A diaphragm apparatus comprising: a diaphragm blade that changes the size of a diaphragm opening by moving straight in a plane perpendicular to an optical axis; and a driving unit that drives the diaphragm blade by moving an output member. A filter member attached to the diaphragm blade is mounted on the diaphragm blade so as to be located in an aperture opening formed by the diaphragm blade, and the filter member includes a plurality of filter members each having a uniform transmittance. A region, and the region is set so that the transmittance increases in order from the outside to the inside of the diaphragm opening, and the filter member is moved so that a boundary of the region is orthogonal to a moving direction of the diaphragm blade. A diaphragm device attached to a diaphragm blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011381A JP2592949B2 (en) | 1989-01-20 | 1989-01-20 | Aperture device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011381A JP2592949B2 (en) | 1989-01-20 | 1989-01-20 | Aperture device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02190833A JPH02190833A (en) | 1990-07-26 |
| JP2592949B2 true JP2592949B2 (en) | 1997-03-19 |
Family
ID=11776436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1011381A Expired - Lifetime JP2592949B2 (en) | 1989-01-20 | 1989-01-20 | Aperture device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2592949B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7295391B1 (en) | 2005-12-22 | 2007-11-13 | Canon Denshi Kabushiki Kaisha | ND filter for aperture device and aperture device comprising ND filter |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06289458A (en) * | 1992-04-15 | 1994-10-18 | Matsushita Electric Ind Co Ltd | Diaphragm device |
| JPH06202194A (en) * | 1992-12-05 | 1994-07-22 | Hiroshi Kawamoto | Diaphragm device increasing vignette effect of camera |
| KR100611437B1 (en) | 2001-10-12 | 2006-08-09 | 캐논 가부시끼가이샤 | Light quantity regulating device and optical system having it and photographing device |
| JP4818721B2 (en) | 2005-12-28 | 2011-11-16 | キヤノン電子株式会社 | Optical member |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5913610Y2 (en) * | 1975-05-17 | 1984-04-23 | 富士写真光機株式会社 | Aperture mechanism that can vary the amount of light over a wide range |
| JPH01153532U (en) * | 1988-04-15 | 1989-10-23 |
-
1989
- 1989-01-20 JP JP1011381A patent/JP2592949B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7295391B1 (en) | 2005-12-22 | 2007-11-13 | Canon Denshi Kabushiki Kaisha | ND filter for aperture device and aperture device comprising ND filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02190833A (en) | 1990-07-26 |
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