JPH03146931A - Light quantity controller - Google Patents
Light quantity controllerInfo
- Publication number
- JPH03146931A JPH03146931A JP28678789A JP28678789A JPH03146931A JP H03146931 A JPH03146931 A JP H03146931A JP 28678789 A JP28678789 A JP 28678789A JP 28678789 A JP28678789 A JP 28678789A JP H03146931 A JPH03146931 A JP H03146931A
- Authority
- JP
- Japan
- Prior art keywords
- torque
- arm
- driving
- gear
- output shaft
- 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.)
- Pending
Links
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Diaphragms For Cameras (AREA)
Abstract
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、ステイルビデオ等での撮像光学
系に用いる光量制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a light amount control device used in an imaging optical system of a video camera, still video, or the like.
［従来の技術］
従来、ビデオカメラ等に組込まれた絞り機構は、絞り羽
根１８．１９をスライドする為の駆動部の出力軸２４に
直接駆動アーム１６を結合させ、該駆動アーム１６の両
端ピン１６ａ、１．６ｂを前記絞り羽根１８．１９の長
溝１８ａ、１９ａに挿入し、光量制御を行なっていた。[Prior Art] Conventionally, an aperture mechanism incorporated in a video camera or the like has a drive arm 16 directly connected to an output shaft 24 of a drive unit for sliding aperture blades 18, 19, and pins at both ends of the drive arm 16. 16a and 1.6b were inserted into the long grooves 18a and 19a of the aperture blades 18 and 19 to control the amount of light.
［発明が解決しようとしている課Ｂ］
しかしながら上記従来例では絞り羽根１８゜１９を大略
ダイレクトドライブに構成していた為に下記の様な欠点
があった。[Problem B to be Solved by the Invention] However, in the above-mentioned conventional example, since the aperture blades 18.degree. and 19 were configured approximately in a direct drive manner, there were the following drawbacks.
（１）絞り羽根１８．１９の負荷トルク、及び戻しスプ
リング２０のバネ力等に対する余裕が無い為に、前記絞
り羽根作動の引掛り等が発生した。(1) Since there was no margin for the load torque of the aperture blades 18 and 19 and the spring force of the return spring 20, the aperture blades were stuck in operation.
（２）前記戻しスプリング２０の付勢力が駆動部の出力
軸２４上に片寄せ状態でラジアル負荷がかかる為に円滑
な回転が不可能となり、結果として駆動部の軸損失とな
って駆動部の効率も悪い。(2) Since the biasing force of the return spring 20 applies a radial load on the output shaft 24 of the drive section in a biased state, smooth rotation becomes impossible, resulting in shaft loss of the drive section. It's also inefficient.
以上説明した様な問題を解決する為には駆動部のパワー
をアップする為に駆動部寸法（φＤ、及びＬ＋）を大き
くしたり、消費電流を増大しなければならない等の欠点
があった。In order to solve the above-described problems, there are drawbacks such as increasing the drive unit dimensions (φD and L+) and increasing current consumption in order to increase the power of the drive unit.
本発明によれば、駆動部の出力軸と絞り羽根を移動させ
る為の駆動アームとの間に減速機構、つまりトルクアッ
プの為の機能を付加した事により、絞り羽根の作動の為
の負荷トルク、オートクローズ用の戻しバネ力の負荷及
び駆動部の軸損失よりはるかに優るトルクを発生する事
を可能にした光量制御装置を提供できる。According to the present invention, by adding a deceleration mechanism, that is, a function for increasing torque, between the output shaft of the drive unit and the drive arm for moving the aperture blades, the load torque for operating the aperture blades is increased. Therefore, it is possible to provide a light amount control device that can generate a torque far superior to the load of the return spring force for auto-closing and the axial loss of the drive unit.
［実施例コ
第１図、第２図は本発明の実施例を示し、第１図は本発
明の特徴を最も良く表わす図面である。[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention, and FIG. 1 is a drawing that best represents the features of the present invention.
同図に於いて、駆動部の出力軸４は歯車５が圧入され、
該歯車５と駆動アーム６の一部に形成させた歯車部分６
ａを噛合わせ、駆動部より発生したトルクを歯車群５，
６ａで減速した値で該アーム６に伝達する。つまり駆動
アーム６の回転中心部７での発生トルクは以下の式で大
略表わされる。In the figure, a gear 5 is press-fitted into the output shaft 4 of the drive unit,
A gear portion 6 formed on the gear 5 and a part of the drive arm 6
a, and the torque generated from the drive unit is transmitted to the gear group 5,
The decelerated value is transmitted to the arm 6 at 6a. In other words, the torque generated at the rotation center 7 of the drive arm 6 is roughly expressed by the following equation.
ＰＴ ＝ＤＴ Ｘ （ｉｘｙ） ・・・ （１）Ｐｏ
：駆動アームの回転軸上での発生トルクＤＴ：駆動部、
つまり磁気回路を構成した部分での発生トルク
ｉ ：伝達機構部の減速比
ｙ ：伝達効率
前記計算式より明らかなように、駆動アーム６の回転中
心部７は於いては、駆動部での発生トルクより、更に減
速仕分トルクアップが可能である事が判る。この様な状
態に於いて、前記駆動アーム６の一端ビン部６ｂ、６ｃ
が絞り羽根８．９の長溝部８ａ、９ａに挿入され、駆動
アーム６の扇回移動角度θ°に応じて絞り羽根８．９が
スライドし開閉される。PT = DT X (ixy) ... (1) Po
: Torque generated on the rotation axis of the drive arm DT: Drive section,
In other words, the generated torque i in the part that constitutes the magnetic circuit: Reduction ratio y of the transmission mechanism part: Transmission efficiency As is clear from the above calculation formula, the rotation center part 7 of the drive arm 6 is It can be seen from the torque that it is possible to further increase the deceleration sorting torque. In this state, one end of the drive arm 6 has pin portions 6b and 6c.
are inserted into the long grooves 8a, 9a of the aperture blade 8.9, and the aperture blade 8.9 slides to open and close in accordance with the fan movement angle θ° of the drive arm 6.
さて、ここで駆動部の発生トルクＤＴについて説明する
。Now, the torque DT generated by the drive unit will be explained.
駆動部の出力軸４での発生トルクＤ１は、以下の式て表
わされる。The torque D1 generated at the output shaft 4 of the drive section is expressed by the following formula.
ＤＴ＝ＢＩ ＬＮｒ ・・・ （２）Ｂ：磁束
密度
Ｉ：コイルに流れる電流
Ｌ：コイルの有効長
Ｎ：コイルの巻数
ｒ：マグネットの有効半径
第２図にて説明すると、磁束密度（Ｂ）はマグネット１
の材質とヨーク３とのＡＩＲＧＡＰによって決定される
値であり、現状のマグネットの材質は一般的にサマリウ
ムコバルト系の焼結、又はプラスチックマグネットが採
用されている。DT=BI LNr... (2) B: Magnetic flux density I: Current flowing through the coil L: Effective length of the coil N: Number of turns of the coil r: Effective radius of the magnet As explained in Figure 2, the magnetic flux density (B) is magnet 1
This value is determined by the material of the magnet and the AIRGAP of the yoke 3, and the material of the current magnet is generally samarium cobalt sintered or plastic magnet.
ボビン１０に巻回されているコイル２に流れる電流（１
）は電源電圧及びコイル抵抗値によって決定され、−膜
内には２０〜２５ｍＡの消費電流である。Current flowing through the coil 2 wound around the bobbin 10 (1
) is determined by the power supply voltage and coil resistance value, - current consumption in the membrane is 20-25 mA.
コイル２の有効長（Ｌ）は前記ボビン１ｏにコイルが巻
回されている状態に於いて大略、マグネット１のスラス
ト寸法１１によって決定される。The effective length (L) of the coil 2 is approximately determined by the thrust dimension 11 of the magnet 1 when the coil is wound around the bobbin 1o.
コイル２の巻数（Ｎ）は、前記ボビン１ｏの巻線スペー
スとコイル線径によって決定される。The number of turns (N) of the coil 2 is determined by the winding space of the bobbin 1o and the coil wire diameter.
マグネット１の有効半径（ｒ）はマグネット１の直径寸
法により決定される。尚、従来はり。＝３〜４ｇｃｍの
トルク発生であったが、仮に上記（１）式より減速比を
１：３に設定、且つ、歯車の伝達効率を９０％で計算し
た場合、
ＰＴ＝ＤＴｘ （３ｘＯ，９） Ｄ７ ＝３．５ ｇ
−ｃｍ （平均）＝３．５ Ｘ ２．７
＝９．４５ｇ◆ｃｍ
以上の様に約３倍のトルク発生が可能になる。The effective radius (r) of the magnet 1 is determined by the diameter dimension of the magnet 1. In addition, conventional beams. = 3 to 4 gcm of torque was generated, but if we set the reduction ratio to 1:3 from the above formula (1) and calculate the gear transmission efficiency at 90%, then PT = DTx (3xO, 9) D7 = 3.5 g
-cm (average) = 3.5 x 2.7 = 9.45g◆cm As described above, approximately three times as much torque can be generated.
なお、図において、１２は駆動部の非駆動時（コイルへ
の非通電時）に絞り羽根８，９を閉じ方向Ｃ付勢するス
プリングであり、駆動アーム６の回転軸部６ｄに巻回さ
れ、該駆動アーム６を時計方向に付勢している。又、２
０は地板であり、絞り羽根８，９をスライドさせる為の
ピン２０ａ〜２０ｄが設けられると共に、光束が通る開
口部２０ｅが形成されている。In the figure, reference numeral 12 denotes a spring that biases the aperture blades 8 and 9 in the closing direction C when the drive unit is not driven (when the coil is not energized), and is wound around the rotating shaft 6d of the drive arm 6. , urging the drive arm 6 clockwise. Also, 2
0 is a base plate, which is provided with pins 20a to 20d for sliding the aperture blades 8 and 9, and has an opening 20e through which a luminous flux passes.
なお、絞り羽根８．９には上記ビン２０ａ〜２０ｄが挿
入される長溝８ｂ、８ｃ、９ｂ、９ｃが形成されている
。The aperture blade 8.9 is formed with long grooves 8b, 8c, 9b, and 9c into which the bottles 20a to 20d are inserted.
［他の実施例］ 他の実施例を第３図を用いて説明する。[Other Examples] Another embodiment will be described with reference to FIG.
駆動部の出力軸４に固定されている歯車５と、駆動アー
ム１３と一体化されたアウター歯車１３ａを噛合させる
ことにより、前記同様減速機能をもたせトルクアップを
行なっている。したがって減速比分のトルクアップが可
能になる。By meshing the gear 5 fixed to the output shaft 4 of the drive section with the outer gear 13a integrated with the drive arm 13, the same deceleration function as described above is provided and torque is increased. Therefore, the torque can be increased by the reduction ratio.
第４図は、駆動部の出力軸４に固定されているプーリ１
４と駆動アーム１７と一体化されたプーリ１６をベルト
１５によってつないだもので、上述同様、減速機能をも
たせ、減速比分のトルクアップが可能になる。Figure 4 shows the pulley 1 fixed to the output shaft 4 of the drive unit.
4 and a pulley 16 integrated with a drive arm 17 are connected by a belt 15, and as described above, it has a speed reduction function and can increase the torque by the speed reduction ratio.
［発明の効果］
以上説明した様に駆動部の出力軸と絞り羽根を開閉する
駆動アームとの間に減速機構を構成することによって数
倍のトルクアップが可能になり以下の効果がある。[Effects of the Invention] As explained above, by configuring the speed reduction mechanism between the output shaft of the drive unit and the drive arm that opens and closes the aperture blades, it is possible to increase the torque several times, and the following effects are obtained.
（１）絞り羽根の作動引掛りがなくなり、円滑な開閉が
可能になった。(1) The aperture blades no longer get caught in the operation, allowing smooth opening and closing.
（２）耐久や環境の高・低温に対しての摩耗に対しても
余裕が出来る。(2) It provides durability and leeway against wear due to high and low temperatures in the environment.
又、実施例では戻しスプリングの付勢力が駆動部の出力
軸に直接かからないようにしたので、駆動部の出力軸の
軸損失も低減され、消費電流の低減比も可能になった。Furthermore, in the embodiment, since the biasing force of the return spring is not applied directly to the output shaft of the drive section, the axial loss of the output shaft of the drive section is also reduced, making it possible to reduce the current consumption ratio.
又、トルクアップ（実施例では約３倍）が可能になっに
為に、光量制御装置の要求仕様に対しての設計自由度が
増えた。例を以下に述べる。Furthermore, since it is possible to increase the torque (approximately three times as much in the example), the degree of freedom in designing for the required specifications of the light amount control device has increased. An example is given below.
■駆動部の外径及び長さ寸法が要求に対して小形、軽量
化が可能になり光量装置を実装する鏡筒設計の自由度（
小型、軽量化）も増える。■The outer diameter and length of the drive unit can be made smaller and lighter than required, allowing greater flexibility in designing the lens barrel to mount the light quantity device (
(smaller, lighter weight) will also increase.
■消費電流の低減化
■実施例によれば駆動部に使用する永久磁石の材料をフ
ェライト系のプラスチックマグネット等の使用も可能と
なる。つまりコストダウンが出来る。■Reducing current consumption■ According to the embodiment, it is possible to use a ferrite-based plastic magnet as the material of the permanent magnet used in the drive section. In other words, costs can be reduced.
尚、■〜■については全て前記の（１）。In addition, regarding (1) to (2), all of the above apply.
（２）式のトルク発生する為の因子を適宜変更操作する
ことにより可能となる。This can be achieved by appropriately changing the factors for torque generation in equation (2).
第１図は本発明を実施した平面図
第２図は本発明を実施した第１図の断面図第３図は本発
明の他の実施例の部分平面図第４図は本発明の更に他の
実施例の部分平面図第５図は従来の平面図
第６図は従来の第５図の断面図
４・・・出力軸
５・・・歯車
６・・・駆動アーム、６ａ・・・歯部
８．９・・・絞り羽根
特開平３
１４６９３１（４）
１１１１
園
「FIG. 1 is a plan view of an embodiment of the present invention. FIG. 2 is a sectional view of FIG. 1 of the embodiment of the present invention. FIG. 3 is a partial plan view of another embodiment of the present invention. FIG. 5 is a plan view of the conventional example. FIG. 6 is a sectional view of the conventional example shown in FIG. Part 8.9... Aperture blade JP-A-3 146931 (4) 1111 Garden "
Claims (4)
根を開閉する為の駆動アームと、の間を減速機構により
連結したことを特徴とする光量制御装置。(1) A light amount control device characterized in that an output shaft of a drive section as a torque generation source and a drive arm for opening and closing an aperture blade are connected by a speed reduction mechanism.
）記載の光量制御装置。(2) Claim (1) wherein a gear mechanism is used as the speed reduction mechanism.
) Light amount control device described.
求項（１）記載の光量制御装置。(3) The light amount control device according to claim (1), wherein a belt transmission mechanism is used as the speed reduction mechanism.
に付勢するスプリングを、上記駆動アームの回転軸上に
巻回した請求項（１）、（２）又は（３）記載の光量制
御装置。(4) The amount of light according to claim (1), (2) or (3), wherein a spring that urges the aperture blades in a closing direction when the drive section is not driven is wound around the rotation axis of the drive arm. Control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28678789A JPH03146931A (en) | 1989-11-02 | 1989-11-02 | Light quantity controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28678789A JPH03146931A (en) | 1989-11-02 | 1989-11-02 | Light quantity controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03146931A true JPH03146931A (en) | 1991-06-21 |
Family
ID=17709043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28678789A Pending JPH03146931A (en) | 1989-11-02 | 1989-11-02 | Light quantity controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03146931A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0590457U (en) * | 1991-06-26 | 1993-12-10 | ニスカ株式会社 | Light intensity adjustment device |
| JP2010078754A (en) * | 2008-09-25 | 2010-04-08 | Nippon Seimitsu Sokki Kk | Diaphragm device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4730805U (en) * | 1971-04-28 | 1972-12-07 |
-
1989
- 1989-11-02 JP JP28678789A patent/JPH03146931A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4730805U (en) * | 1971-04-28 | 1972-12-07 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0590457U (en) * | 1991-06-26 | 1993-12-10 | ニスカ株式会社 | Light intensity adjustment device |
| JP2010078754A (en) * | 2008-09-25 | 2010-04-08 | Nippon Seimitsu Sokki Kk | Diaphragm device |
| JP4653206B2 (en) * | 2008-09-25 | 2011-03-16 | 日本精密測器株式会社 | Aperture device |
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