JP2568309B2 - Light stop device and optical apparatus having light stop device - Google Patents
Light stop device and optical apparatus having light stop deviceInfo
- Publication number
- JP2568309B2 JP2568309B2 JP2310529A JP31052990A JP2568309B2 JP 2568309 B2 JP2568309 B2 JP 2568309B2 JP 2310529 A JP2310529 A JP 2310529A JP 31052990 A JP31052990 A JP 31052990A JP 2568309 B2 JP2568309 B2 JP 2568309B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical
- 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)
- Blocking Light 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あるいはスティルビデオカメラ
等の光学機器の撮影光学系に適した光量絞り装置に関す
るものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light amount aperture device suitable for a photographing optical system of an optical device such as a video camera or a still video camera.
［従来の技術］ ビデオカメラは撮像素子がCCD等の固体撮像素子にな
り、以前に増して感度が高くなってきた。従って鏡筒や
羽根端面、羽根支持部材の反射光などの不必要な光に対
しても敏感になり、像の劣化を生じる。また、感度が高
くなったため、晴天時や高輝度の被写体を撮影すると絞
りは小絞りとなり、絞りのハンチング現象が起きやす
い。又、小絞りによる光の回折の影響も受けやすく、像
性能の劣化を生じる。前記の対策として絞り羽根にフィ
ルム状のNDフィルターを取り付けて、被写界の明るさが
同一でも絞りの開口を大きくしている。[Prior Art] A video camera has a solid-state image sensor such as a CCD as an image sensor, and has a higher sensitivity than before. Therefore, it becomes sensitive to unnecessary light such as reflected light from the lens barrel, the blade end face, and the blade support member, and the image is deteriorated. In addition, since the sensitivity is increased, the aperture becomes small when shooting a subject with fine weather or high brightness, and the hunting phenomenon of the aperture is likely to occur. In addition, it is easily affected by the diffraction of light due to the small aperture, and the image performance is deteriorated. As a countermeasure, a film-like ND filter is attached to the aperture blade to increase the aperture of the aperture even if the brightness of the object field is the same.
第４図〜第６図には従来の撮影系の構成が示されてい
る。図において、２はNDフィルターであり、後述の絞り
羽根６に取り付けられている。３は絞り羽根支持部材で
あり、通常は後述の絞り羽根6,7の開放径より大径の口
径な開口3aを設けている。４は駆動伝達レバー、５は駆
動伝達レバー４を常に開放方向に付勢する戻しバネ、6,
7は絞り羽根であり、駆動伝達レバー４の揺動によって
溝6a,7aの方向にスライド移動することによって光束を
通す開口量を変化させる。８はカバー板であり、開口8a
が形成されている。9A,9Bはコイルユニット、10はマグ
ネットローターであり、上記絞り羽根6,7の移動を駆動
源となる。15A〜15Cはレンズ、16はCCD等の撮像素子、1
7はローパスフィルターである。4 to 6 show the configuration of a conventional photographing system. In the figure, reference numeral 2 denotes an ND filter, which is attached to an aperture blade 6 described later. Reference numeral 3 denotes a diaphragm blade supporting member, which is provided with an opening 3a having a diameter larger than the opening diameter of the diaphragm blades 6, 7 described later. 4 is a drive transmission lever, 5 is a return spring that constantly urges the drive transmission lever 4 in the opening direction,
Reference numeral 7 denotes an aperture blade, which slides in the direction of the grooves 6a and 7a by the swing of the drive transmission lever 4 to change the opening amount through which the light beam passes. Reference numeral 8 denotes a cover plate, and an opening 8a
Are formed. Reference numerals 9A and 9B denote coil units, and reference numeral 10 denotes a magnet rotor, which serves as a driving source by moving the aperture blades 6 and 7. 15A to 15C are lenses, 16 is an image sensor such as a CCD, 1
7 is a low-pass filter.
［発明が解決しようとしている課題］ ところが、近年、撮像素子面16の反射率が高まった
為、第５図で示すように撮像素子16で反射した光束32が
NDフィルター２で再び反射して、光束33となってゴース
ト像を発生することがある。[Problems to be Solved by the Invention] However, in recent years, since the reflectance of the imaging element surface 16 has increased, as shown in FIG.
In some cases, the light is reflected again by the ND filter 2 and becomes a light beam 33 to generate a ghost image.
［課題を解決するための手段］ 本発明は移動することで光束を制限する絞り羽根と、
絞り羽根によって制限された光束内に移動可能な光学フ
ィルターを有し、光電交換素子を有する光学機器に配置
され、光電交換素子に入射する光束を制限する光量絞り
装置において、絞り羽根の開放径と同等もしくはそれよ
り小さい開口が光軸上に設けられた遮光部材を前記光学
フィルターと前記光電交換素子との間で、かつ前記光学
フィルターから光軸後方に所定距離だけ離した位置に設
けたもとを特徴とする。[Means for Solving the Problems] The present invention provides a diaphragm blade that restricts a light beam by moving,
An optical filter having a movable optical filter within a light beam limited by the aperture blade, disposed in an optical device having a photoelectric exchange element, in a light amount aperture device that restricts a light beam incident on the photoelectric exchange element, the aperture diameter of the aperture blade and An equivalent or smaller aperture is provided on the optical axis with a light blocking member provided between the optical filter and the photoelectric exchange element and at a position separated by a predetermined distance behind the optical axis from the optical filter. And
［実施例］ 第１図ないし第３図は本発明の実施例を示す。第１図
は遮光板を設けた光量絞り装置の平面図を示す。Embodiment FIG. 1 to FIG. 3 show an embodiment of the present invention. FIG. 1 shows a plan view of a light quantity stop device provided with a light shielding plate.
第２図は遮光板を有する光量絞り装置を組込んだレン
ズユニット全体の側面図である。本実施例の特徴は線20
で示す正規の像の光束を遮断しない距離ｌの位置に遮光
板１を設けたことである。線20の光束は遮光板１の孔1a
を通り、各レンズ15B〜15Dを通り、撮像素子面16に結像
する。FIG. 2 is a side view of the entire lens unit incorporating a light amount diaphragm device having a light shielding plate. The feature of this embodiment is that the line 20
The light shielding plate 1 is provided at a position at a distance l which does not block the light flux of the regular image indicated by. The luminous flux of the line 20 passes through the hole 1a of the light shielding plate 1.
Passes through each of the lenses 15B to 15D to form an image on the imaging element surface 16.
ところが、絞り羽根6,7は反射防止の塗装したシート
を加工する場合が多く、その端面6b,7bは反射防止が施
されていない。その為、第２図の線31の光束のような方
向の光を反射してしまい、撮像素子16方向に進む。その
際、実施例では遮光板１がその反射光束を遮断する。ま
た、撮像素子面16で反射された光束32はNDフィルター面
２で再度反射されて、撮像素子16の方向に進み、遮光板
１で遮断される。また、NDフィルター２に達する前に遮
断される光束もある。また、レンズ15A〜15Dの小型化に
より開放径も小さくなり、光束の回折も起こりやすい
が、第３図が示すように遮光板１は回折した光束も遮断
する。However, the diaphragm blades 6 and 7 are often formed by processing an anti-reflection painted sheet, and the end surfaces 6b and 7b are not provided with anti-reflection. Therefore, light in a direction like the light flux of the line 31 in FIG. 2 is reflected, and travels toward the image sensor 16. At that time, in the embodiment, the light shielding plate 1 blocks the reflected light beam. The light beam 32 reflected on the image sensor surface 16 is reflected again on the ND filter surface 2, travels toward the image sensor 16, and is blocked by the light shielding plate 1. Further, some light beams are blocked before reaching the ND filter 2. Further, as the lenses 15A to 15D are miniaturized, the aperture diameter becomes smaller and the light beam is easily diffracted. However, as shown in FIG. 3, the light shielding plate 1 also blocks the diffracted light beam.
［発明の効果］ 以上説明したように本発明によれば、移動することで
光束を制限する絞り羽根と、絞り羽根によって制限され
た光束内に移動可能な光学フィルターを有し、光電変換
素子を有する光学機器に配置され、光電変換素子に入射
する光束を制限する光量絞り装置において、絞り羽根の
開放径と同等もしくはそれより小さい開口が光軸上に設
けられた遮光部材を前記光学フィルターと前記光電変換
素子との間で、かつ前記光学フィルターから光軸後方に
所定距離だけ離した位置に設けたことによって、光束内
に移動可能な光学フィルター面、光電変換素子面、絞り
羽根端面、羽根支持部材等で反射した光束や、絞りによ
り回折した光束が光電変換素子面に戻って撮影画像に悪
影響を与えることを防ぐことができる。[Effects of the Invention] As described above, according to the present invention, the photoelectric conversion element includes a diaphragm blade that restricts a light beam by moving, and an optical filter that can move within the light beam restricted by the diaphragm blade. In a light amount aperture device that is disposed on an optical device having a light beam that restricts a light beam incident on a photoelectric conversion element, an aperture equal to or smaller than an open diameter of an aperture blade is provided on the optical axis with a light-shielding member provided with the optical filter and the optical filter. An optical filter surface, a photoelectric conversion element surface, an aperture blade end surface, and a blade support that can be moved in a light beam by being provided at a position separated by a predetermined distance behind the optical filter from the optical filter and between the photoelectric conversion device and the optical filter. It is possible to prevent a light beam reflected by a member or the like or a light beam diffracted by the stop from returning to the photoelectric conversion element surface and adversely affecting the captured image.
第１図は本発明を実施した光量絞り装置の平面図、 第２図及び第３図は第１図の光量絞り装置を組み込んだ
レンズユニット側面図 第４図は従来の光量絞り装置の平面図 第５図は第４図の光量絞り装置を組み込んだレンズユニ
ット側面図 第６図は第４図の光量絞り装置の分解斜視図。 １は遮光板 ２はNDフィルター ３は絞り羽根支持部材 ６は絞り羽根 ７は絞り羽根 15A〜15Dはレンズ 16は撮像素子 17はローパスフィルターFIG. 1 is a plan view of a light amount stop device embodying the present invention, FIGS. 2 and 3 are side views of a lens unit incorporating the light amount stop device of FIG. 1, and FIG. 4 is a plan view of a conventional light amount stop device. FIG. 5 is a side view of a lens unit incorporating the light amount diaphragm device of FIG. 4. FIG. 6 is an exploded perspective view of the light amount diaphragm device of FIG. 1 is a light shielding plate 2 is an ND filter 3 is an aperture blade support member 6 is an aperture blade 7 is an aperture blade 15A to 15D is a lens 16 is an image sensor 17 is a low-pass filter
Claims (2)
と、該絞り羽根によって制限された光束内に移動可能な
光学フィルターを有し、光電交換素子を有する光学機器
に配置され、該光電変換素子に入射する光束を制限する
光量絞り装置において、 前記絞り羽根の開放径と同等もしくはそれより小さい開
口が光軸上に設けられた遮光部材を前記光学フィルター
と前記光電交換素子との間で、かつ前記光学フィルター
から光軸後方に所定距離だけ離した位置に設けたことを
特徴とする光量絞り装置。An optical system comprising: a diaphragm blade for restricting a luminous flux by moving; an optical filter movable within the luminous flux restricted by the diaphragm blade; In a light amount stop device for restricting a light beam incident on the element, an aperture equal to or smaller than the open diameter of the aperture blade, a light shielding member provided on the optical axis between the optical filter and the photoelectric exchange element, And a light amount stop device provided at a position separated by a predetermined distance behind the optical axis from the optical filter.
と、該絞り羽根によって制限された光束内に移動可能な
光学フィルターを有する絞り装置と該絞り装置よりも光
軸後方に配置される光電交換素子を有する光学機器にお
いて、 前記絞り羽根の開放径と同等もしくはそれより小さい開
口が光軸上に設けられた遮光部材を前記光学フィルター
と前記光電変換素子との間で、かつ前記光学フィルター
から光軸後方に所定距離だけ離した位置に設けたことを
特徴とする光学機器。2. A diaphragm device having a diaphragm blade for restricting a light beam by moving, a diaphragm device having an optical filter movable within the light beam restricted by the diaphragm blade, and a photoelectric device arranged behind the diaphragm device on the optical axis. In an optical device having an exchange element, a light-blocking member having an opening equal to or smaller than the open diameter of the aperture blade provided on the optical axis is provided between the optical filter and the photoelectric conversion element and from the optical filter. An optical device provided at a position separated by a predetermined distance behind an optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2310529A JP2568309B2 (en) | 1990-11-15 | 1990-11-15 | Light stop device and optical apparatus having light stop device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2310529A JP2568309B2 (en) | 1990-11-15 | 1990-11-15 | Light stop device and optical apparatus having light stop device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04180478A JPH04180478A (en) | 1992-06-26 |
| JP2568309B2 true JP2568309B2 (en) | 1997-01-08 |
Family
ID=18006332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2310529A Expired - Lifetime JP2568309B2 (en) | 1990-11-15 | 1990-11-15 | Light stop device and optical apparatus having light stop device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2568309B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006072151A (en) * | 2004-09-03 | 2006-03-16 | Fujinon Corp | Diaphragm plate |
| JP5082325B2 (en) * | 2006-08-03 | 2012-11-28 | 株式会社ニコン | Imaging device |
| CN108490714B (en) * | 2018-03-22 | 2020-12-11 | 中国科学院国家空间科学中心 | Star sensor lens hood |
-
1990
- 1990-11-15 JP JP2310529A patent/JP2568309B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04180478A (en) | 1992-06-26 |
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