JP2566088Y2 - Focusing device for lens barrel for optical equipment - Google Patents
Focusing device for lens barrel for optical equipmentInfo
- Publication number
- JP2566088Y2 JP2566088Y2 JP1990056946U JP5694690U JP2566088Y2 JP 2566088 Y2 JP2566088 Y2 JP 2566088Y2 JP 1990056946 U JP1990056946 U JP 1990056946U JP 5694690 U JP5694690 U JP 5694690U JP 2566088 Y2 JP2566088 Y2 JP 2566088Y2
- Authority
- JP
- Japan
- Prior art keywords
- lens barrel
- screw
- helicoid
- operation ring
- fixed
- 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 - Fee Related
Links
Landscapes
- Focusing (AREA)
- Lens Barrels (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案は光学機器用レンズ鏡胴の合焦装置に関するも
のである。The present invention relates to a focusing device for a lens barrel for an optical device.
従来の技術 光学機器用レンズ鏡胴に於ける光学系の焦点合わせ
（以下合焦という）の為のレンズ鏡胴を前後方向に移動
する機構は、ヘリコイド式焦点調節機構と呼ばれ、中空
円筒体に設けた平行ネジ（以下ヘリコイドネジと呼ぶ）
を使用した機構が多く採用されている。特にヘリコイド
ネジの設けられた中空円筒体をヘリコイド筒と称し、オ
ネジ側を内側ヘリコイド筒とか、雄ヘリコイド筒とか呼
び、メネジ側を外側ヘリコイド筒とか、雌ヘリコイド筒
と呼ぶ。一般的に、雌ヘリコイド筒は、雄ヘリコイド筒
と螺合するリードの大きな多条ネジ、即ち、ヘリコイド
ネジの他に、固定鏡胴に螺合する為の、前記ヘリコイド
ネジとはネジ方向の異なったピッチの小さいネジを有
し、該小さいネジにより固定鏡胴に対して回転するよう
に構成してある。雄ヘリコイド筒は光学系を保持し、前
記固定鏡胴とキーとキー溝の関係で結合し、雌ヘリコイ
ドを回転する事により、ヘリコイドネジの推力により雄
ヘリコイド筒をキー溝に沿って直進させる機能を有し、
この機構を直進ヘリコイド式焦点調節機構と呼び、中級
レンズ以上の光学機器用レンズ鏡胴に多く使用されてい
る。2. Description of the Related Art A mechanism for moving a lens barrel in the front-rear direction for focusing (hereinafter referred to as focusing) of an optical system in a lens barrel for an optical device is called a helicoid type focusing mechanism, and is a hollow cylindrical body. Parallel screw (hereinafter referred to as helicoid screw)
Many mechanisms using are used. In particular, a hollow cylinder provided with a helicoid screw is referred to as a helicoid cylinder, the male screw side is referred to as an inner helicoid cylinder or a male helicoid cylinder, and the female screw side is referred to as an outer helicoid cylinder or a female helicoid cylinder. In general, a female helicoid cylinder has a screw thread different from the helicoid screw for screwing to a fixed lens barrel, in addition to a multi-start thread having a large lead screwed with a male helicoid cylinder, that is, a helicoid screw. It has a screw with a small pitch and is configured to rotate with respect to the fixed lens barrel by the small screw. The male helicoid cylinder holds the optical system, is connected to the fixed lens barrel in the relationship between the key and the key groove, and rotates the female helicoid, so that the male helicoid cylinder moves straight along the key groove by the thrust of the helicoid screw. Has,
This mechanism is called a straight-line helicoid focus adjustment mechanism, and is often used in lens barrels for optical instruments of intermediate grade or higher.
考案が解決しようとする問題点 光学機器用レンズ鏡胴のヘリコイド筒は特に精密さ
と、良好な操作性が要求され、従って、従来よりヘリコ
イドネジに於いては、ワーリング等の機械加工をした後
でネジ合わせを行い、更にラッピング等を実施し、ネジ
の嵌合クリアランスの程度、及びネジの回転感触の程度
を確認しながら前述の要求を確保する手段としていたた
め、加工が難しい上に、加工コストが高くつくものであ
った。Problems to be Solved by the Invention The helicoid tube of the lens barrel for optical equipment requires particularly high precision and good operability, and therefore, in the case of helicoid screws, conventionally, after machining such as warring, etc. Alignment of screws, wrapping, etc. are performed to ensure the above-mentioned requirements while confirming the degree of clearance of screw engagement and the degree of screw feel, so processing is difficult and processing cost is high. Was expensive.
しかしながら、近ごろ特に光学機器用レンズ鏡胴に於
いては、高性能の製品を極めて低価格で市場に供給する
事が必須条件となってきている。However, recently, especially in a lens barrel for an optical device, it has become an essential condition to supply a high-performance product to the market at an extremely low price.
旧来は光学機器用レンズ鏡胴の構成部品は、全て金属
材料を用いて、精度の高い部品加工とし、これによって
高品質のレンズ鏡胴を構成していたが、プラスチック成
形技術、金型製造技術等の技術の発展に伴って、高性能
を要求される光学機器用レンズ鏡胴にも積極的にプラス
チック成形品を採用し、加工コスト引いては製品価格の
低減、製品の軽量化等を計り、市場の要求に答えた製品
開発が要求されつつあるが、光学機器用レンズ鏡胴のヘ
リコイド筒をプラスチック成形品とする事は、より高い
品質のものを得ようとする場合には、精度的に十分目的
を満足する部品として提供し得なかった。In the past, all components of the lens barrel for optical equipment were made of high-precision parts using metal materials, thereby forming a high-quality lens barrel. Plastic molding technology, mold manufacturing technology With the development of technologies such as these, plastic molded products are also actively adopted for lens barrels for optical equipment, which require high performance, to reduce processing costs, reduce product prices, and reduce product weight. Although the development of products that respond to market demands is being demanded, the use of plastic molded helicoid cylinders for lens barrels for optical equipment requires high precision in order to obtain higher quality products. Could not be provided as a part that fully satisfies the purpose.
従って、プラスチック成形品のヘリコイドネジは、中
級機以下の製品に組み込まれて使用されているのが現状
である。又その場合でも、ピッチの小さな固定鏡胴に螺
合するネジに関しては一方は金属にする事でネジガタを
防止し、光軸のタオレから発生する像精度の劣下を防止
する方策が取られていた。Therefore, at present, helicoid screws made of plastic molded products are used by being incorporated in products of intermediate and lower grades. Also in this case, one of the screws to be screwed into the fixed barrel with a small pitch is made of metal to prevent the backlash of the screw and to prevent the deterioration of the image accuracy caused by the optical axis's torque. Was.
その理由は、プラスチック材料によるヘリコイド筒の
成形時に発生する成形歪の問題と型構成上からくる真円
度精度の問題である。The reason is a problem of molding distortion generated at the time of molding the helicoid cylinder with a plastic material, and a problem of roundness accuracy due to a mold configuration.
この場合、円筒体の円周上にヘリコイドネジを成形す
るわけであり、ネジ部のオーバーハングを解消する為に
は、型の廻し抜きか、あるいは最低でも三つ割りの型構
成にした割型で成形する必要があり、いずれの方式の場
合でも、成形歪を極度に押えた真円度精度の高い成形品
を生産する事は非常に難しく、ネジ螺合のガタ、即ち、
クリアランスの少ない成形品を生産する事は非常に困難
である。逆に、ネジにクリアランスを大く見越した場合
には、光学系のタオレを発生させる事になり、像性能を
維持する事が困難となり、妥協の許されない問題であ
る。In this case, a helicoid screw is formed on the circumference of the cylindrical body. In order to eliminate the overhang of the screw part, it is necessary to cut out the die or at least split the die into a three-part mold configuration. In any case, it is very difficult to produce a molded product with a high degree of roundness accuracy that suppresses molding distortion extremely.
It is very difficult to produce a molded article with a small clearance. On the other hand, if the clearance of the screw is greatly anticipated, the optical system will be distorted, and it will be difficult to maintain the image performance.
また、前述のごとく、従来の一般的なヘリコイド式合
焦機構は、第３図に記載のように、ヘリコイドネジ2A,3
Aとネジ方向を異にしたピッチの小さいネジ3fを操作環
３が有し、固定鏡胴１のネジ1fに螺合させている構成で
あるが、このピッチの小さなネジ1f,3fをプラスチック
成形で製作した場合、ネジガタが発生したときに振動、
衝撃に非常に弱いものとなり、衝撃によりピッチズレ
（ネジ山を飛び越えて次の山に入る様な現象）が発生す
る危険が高く、ネジ精度を確保するのが困難であった。Further, as described above, the conventional general helicoid focusing mechanism employs the helicoid screws 2A, 3A as shown in FIG.
The operation ring 3 has a small pitch screw 3f having a screw direction different from that of A, and is screwed to the screw 1f of the fixed lens barrel 1. The small pitch screws 1f, 3f are formed by plastic molding. If manufactured with vibration,
It is very weak to impact, and there is a high risk that pitch shift (a phenomenon of jumping over a screw thread and entering the next thread) occurs due to the impact, and it is difficult to secure screw accuracy.
問題点を解決するための手段 本考案は上述した問題に鑑みて成されたもので、光学
機器用レンズ鏡胴における光学系を光軸に沿って移動さ
せる機構を構成する操作環３と、光学系を保持する鏡筒
２と、光学機器本体への取付部を有する固定鏡胴１と、
操作環３を介在させ鏡筒２に一体係合する押え環５と固
定鏡胴１との間で挟持され、光軸一方向に付勢する弾性
部材４とからなり、鏡筒２と操作環３とはヘリコイドネ
ジにより螺合する構成を有すると共に、操作環３と固定
鏡胴１をインロー部により嵌合し、且つ前記固定鏡胴
１、鏡筒２及び操作環３の少なくとも２つを樹脂で構成
したことを特徴とする光学機器用レンズ鏡胴の合焦装置
を提供するものである。Means for Solving the Problems The present invention has been made in view of the above-described problems, and has an operation ring 3 constituting a mechanism for moving an optical system in a lens barrel for an optical device along an optical axis; A lens barrel 2 for holding a system, a fixed lens barrel 1 having an attachment portion to an optical device main body,
An elastic member 4, which is sandwiched between a holding ring 5 and a fixed lens barrel 1, which is integrally engaged with the lens barrel 2 with an operation ring 3 interposed therebetween, and biases the optical axis in one direction, comprises the lens barrel 2 and the operation ring. 3 is configured to be screwed with a helicoid screw, the operation ring 3 and the fixed lens barrel 1 are fitted by a spigot portion, and at least two of the fixed lens barrel 1, the lens barrel 2 and the operation ring 3 are made of resin. And a focusing device for a lens barrel for an optical device.
作用 本考案は上述した構成を有するから、操作環３を介在
させ鏡筒２と固定鏡胴１とで挟持した弾性部材４の弾性
力が、固定鏡胴１に操作環３を光軸方向に於いて密着し
た状態で鏡筒２を固定鏡胴１側に引き寄せるように作用
するため、操作環３と鏡筒２とを螺合するヘリコイドネ
ジは常に密着していることとなり、従って、レンズ鏡胴
の合焦の為に使用するヘリコイドネジのクリアランスを
大きくとっても像性能の劣下につながらず、しかもヘリ
コイドネジと方向を異にしたピッチの小さいネジを使用
せず弾性部材の反発力を利用し、部品構成を簡単に成
し、且つ、構成部品のプラスチック成形部品化が可能と
なり、コスト的にも生産性に富んだ光学機器用レンズ鏡
胴の合焦装置を提供する作用がある。Action Since the present invention has the above-described configuration, the elastic force of the elastic member 4 sandwiched between the lens barrel 2 and the fixed lens barrel 1 with the operation ring 3 interposed therebetween allows the fixed lens barrel 1 to move the operation ring 3 in the optical axis direction. In this state, the lens barrel 2 acts to draw the lens barrel 2 toward the fixed lens barrel 1 in a close contact state, so that the helicoid screw for screwing the operation ring 3 and the lens barrel 2 is always in close contact with each other. Even if the clearance of the helicoid screw used for focusing the torso is increased, the image performance does not deteriorate, and the repulsion force of the elastic member is used without using a small pitch screw with a different direction from the helicoid screw. In addition, there is an effect of providing a focusing device for a lens barrel for an optical apparatus, which has a simple component configuration, can be made into a plastic molded component, and has high productivity in terms of cost.
また、従来の一般的なヘリコイド式合焦機構において
はヘリコイドネジ2A,3Aとネジ方向を異にしたピッチの
小さいネジ3fを操作環３が有し、固定鏡胴１のネジ1fに
螺合させている構成であるが、この従来例におけるピッ
チの小さいネジ1f,3fのネジ螺合を、インロー部をもた
せた嵌合結合とし、弾性部材４の反発力を利用して操作
環３を固定鏡胴１に圧着した状態で保持した構成とした
ことによって、振動、衝撃に強い構成となり、従来のヘ
リコイド式合焦装置の一部を流用しながらも構造部品を
樹脂化するにあたっての従来までの欠点を構造上でカバ
ーし、成形加工性の良い、生産性に富んだ合焦機構を提
供する作用がある。In a conventional general helicoid focusing mechanism, the operation ring 3 has a small pitch screw 3f having a different screw direction from the helicoid screws 2A, 3A, and is screwed to the screw 1f of the fixed lens barrel 1. However, the screw thread 1f, 3f with a small pitch in this conventional example is a fitting connection with a spigot portion, and the operating ring 3 is fixed to the fixed mirror by utilizing the repulsive force of the elastic member 4. By adopting a configuration in which it is held in a state of being pressed against the body 1, it has a configuration that is resistant to vibration and impact, and a conventional drawback in converting structural parts to resin while using a part of the conventional helicoid focusing device. To provide a focusing mechanism with good moldability and high productivity.
実施例 以下に本考案の機構をCCTVカメラ用レンズ鏡胴に実施
した一実施例について添付図に基づいて説明する。An embodiment in which the mechanism of the present invention is applied to a lens barrel for a CCTV camera will be described below with reference to the accompanying drawings.
第１図は本考案を適用したCCTVカメラ用レンズ鏡胴の
側断面図であり、このレンズ鏡胴はカメラ本体（図示せ
ず）に装着される固定鏡胴１、操作環３、光学系を保持
する鏡筒２、固定鏡胴１と鏡筒２で挟持された弾性部材
４、押え環５等により構成されている。FIG. 1 is a side sectional view of a lens barrel for a CCTV camera to which the present invention is applied. The lens barrel includes a fixed barrel 1, an operation ring 3, and an optical system mounted on a camera body (not shown). It comprises a lens barrel 2 to be held, an elastic member 4 sandwiched between the fixed lens barrel 1 and the lens barrel 2, a pressing ring 5, and the like.
固定鏡胴１は、本体に装着するマウントネジ1aを有す
ると共に、その反対側に操作環３と内周で嵌合するイン
ロー部1bと、操作環３との当付端面1cを有し、更に鏡筒
２を光軸に沿って直進移動させるためのガイドとなるキ
ー溝1eを有している。The fixed lens barrel 1 has a mount screw 1a to be mounted on the main body, and has a spigot portion 1b fitted on the inner periphery with the operation ring 3 and an abutting end face 1c of the operation ring 3 on the opposite side. It has a keyway 1e as a guide for moving the lens barrel 2 straight along the optical axis.
操作環３は、固定鏡胴１と外周で嵌合するインロー部
3bと、固定鏡胴１との当付端面3cと、鏡筒２とネジ螺合
するヘリコイドネジ3Aを有している。The operating ring 3 is a spigot part fitted around the fixed lens barrel 1 at the outer periphery.
3b, a contact end face 3c of the fixed lens barrel 1, and a helicoid screw 3A screwed to the lens barrel 2.
鏡筒２は、光学系を保持し、操作環３とネジ螺合する
ヘリコイドネジ2Aを有すると共に、固定鏡胴１とキー嵌
合するキー2eを有し、更に弾性部材４の押え環５を取り
付け固着している。The lens barrel 2 holds an optical system, has a helicoid screw 2A screwed with the operation ring 3, has a key 2e fitted with the fixed lens barrel 1, and further has a holding ring 5 of the elastic member 4. It is attached and fixed.
即ち、押え環５は、前記固定鏡胴１のマウントネジ1a
の内周に弾性部材４を収容すべく、固定鏡胴１の当接面
1dに相対してフランジ部を有すると共に、前記鏡筒２に
一体に螺合する固着部を有して、前記弾性部材４を、当
接面1dとフランジ部との間で挟持し、弾性部材４の弾発
力をもって、固定鏡胴１と鏡筒２との間に操作環３を挟
着する構成にしてある。また、3Gは操作環３の回転規制
溝、1Gは固定鏡胴１に設けたそのストッパーピンであ
る。That is, the holding ring 5 is mounted on the mounting screw 1a of the fixed lens barrel 1.
Contact surface of the fixed lens barrel 1 to accommodate the elastic member 4
1d, has a flange portion, and has a fixing portion that is screwed integrally with the lens barrel 2 to hold the elastic member 4 between the contact surface 1d and the flange portion. An operation ring 3 is sandwiched between the fixed lens barrel 1 and the lens barrel 2 with an elastic force of 4. 3G is a rotation restricting groove of the operation ring 3, and 1G is a stopper pin provided on the fixed lens barrel 1.
尚、鏡筒２と固定鏡胴１のキー2eとキー溝1eとの関係
は、固定鏡胴１に対して鏡筒２が光軸に沿って直進移動
すれば良いから、どちら側がキーで、キー溝でも差し支
えない。Note that the relationship between the lens barrel 2 and the key 2e of the fixed lens barrel 1 and the key groove 1e is such that the lens barrel 2 may move straight along the optical axis with respect to the fixed lens barrel 1, so that which side is the key, A keyway can be used.
また、第１図に示したレンズ鏡胴は、最も簡単な構造
のものであり、極めて一般的なものであるが、本考案に
直接関係ない部分は、説明を簡単にする目的で絞り機構
等の一切を省略し、部品構成等も複数部品を一体化した
ものとして簡略化して表示してある。Further, the lens barrel shown in FIG. 1 has the simplest structure and is very general, but the parts not directly related to the present invention include an aperture mechanism and the like for the purpose of simplifying the description. Are omitted, and the component configuration and the like are simplified and displayed as an integrated plurality of components.
上述する如き構造を有するレンズ鏡胴に於いて、合焦
を目的として操作環３を回動操作すると、操作環３の当
付端面3cと固定鏡胴１の当付端面1cとは、弾性部材４の
反発力で押しつけられた状態にインロー部1b,3bで嵌合
しているから、操作環３とヘリコイドネジ3Aと2Aで螺合
している鏡筒２は、ヘリコイドネジの推力で前方に押し
出される事になる。このとき、鏡筒２は固定鏡胴１との
キー2eとキー溝1eの関係で係合している為、光軸に沿っ
た直進移動がなされ、合焦の為の移動となる。操作環３
を逆方向に回動すると、固定鏡胴１と鏡筒２の密着関係
は何も変わる事なく、従って、ヘリコイドネジの推力で
鏡筒２は繰り込まれる方向に直進移動する。この時のヘ
リコイドネジの螺合状態は、第２図で示す様に、操作環
３の回転方向には関係なく、ヘリコイドネジ2A,3Aにガ
タがあっても弾性部材４の反発力により、ガタ分が矢視
方向に片寄せられて、ネジガタを吸収したネジ螺合の状
態を維持している事となる。In the lens barrel having the above-described structure, when the operating ring 3 is rotated for focusing, the abutting end face 3c of the operating ring 3 and the abutting end face 1c of the fixed lens barrel 1 become elastic members. 4 is fitted with the spigot parts 1b and 3b while being pressed by the repulsion force of 4, the lens barrel 2 screwed with the operating ring 3 and the helicoid screws 3A and 2A is moved forward by the thrust of the helicoid screw. It will be pushed out. At this time, since the lens barrel 2 is engaged with the fixed lens barrel 1 in the relationship of the key 2e and the key groove 1e, the lens barrel 2 is moved straight along the optical axis, and is moved for focusing. Operation ring 3
When the is rotated in the opposite direction, the close contact relationship between the fixed lens barrel 1 and the lens barrel 2 does not change at all, and therefore, the lens barrel 2 moves straight in the direction of being retracted by the thrust of the helicoid screw. At this time, as shown in FIG. 2, the helicoid screw is screwed regardless of the rotation direction of the operation ring 3, even if the helicoid screws 2 </ b> A, 3 </ b> A play, due to the repulsive force of the elastic member 4. The part is offset in the direction of the arrow, and the screw engagement state that has absorbed the screw play is maintained.
効果 以上の通り、本考案装置によれば、ヘリコイドネジの
成形加工で発生する程度のガタ量は充分に吸収でき、光
学系の像性能に影響を与えないと共に、感触的にもネジ
ガタを感じない本考案の第１の効果を達成するものであ
る。一方、また、従来の一般的なヘリコイド式合焦機構
は、第３図に記載するように、ヘリコイドネジ2A,3Aと
ネジ方向を異にしたピッチの小さいネジ3fを操作環３に
設け、固定鏡胴１のネジ1fに螺合させた構成にしてあ
る。（尚、第３図に於いて、本考案の実施例と同様の構
成部分は同じ符号を付してその説明は省略する。）然る
に、この従来例に於けるピッチの小さいネジ1f,3fをプ
ラスチック成形で製作した場合、ネジガタが発生し、振
動、衝撃に非常に弱いものとなり、衝撃によりピッチズ
レ（ネジ山を飛び越えて次の山に入る様な現象）が発生
する危険が高く、ネジ精度を確保するのが困難であった
が、本考案は、この構成をピッチの小さいネジ螺合にし
ないでインロー部をもたせた嵌合結合とし、弾性部材４
の反発力を利用して操作環３を固定鏡胴１に圧着した状
態で保持した構成と成した事によって、振動、衝撃に強
い構成となり、従来のヘリコイド式合焦装置の一部を流
用しながらも構成部品を樹脂化するにあたっての従来ま
での欠点を構造上でカバーし、成形加工性の良い、生産
性に富んだ合焦機構を提供することができるものであ
る。Effects As described above, according to the device of the present invention, the amount of backlash generated in the forming of the helicoid screw can be sufficiently absorbed, does not affect the image performance of the optical system, and does not feel the screw backlash tactilely. This achieves the first effect of the present invention. On the other hand, as shown in FIG. 3, a conventional general helicoid focusing mechanism is provided with a small pitch screw 3f having a different screw direction from the helicoid screws 2A, 3A on the operation ring 3 and fixed. It is configured to be screwed into the screw 1f of the lens barrel 1. (Note that in FIG. 3, the same components as those of the embodiment of the present invention are denoted by the same reference numerals and the description thereof is omitted.) However, the screws 1f and 3f having a small pitch in the conventional example are replaced with the same. When manufactured by plastic molding, screw backlash is generated, it is very weak against vibration and impact, and there is a high risk of pitch shift (phenomena that jumps over the screw thread and enters the next peak) due to impact, and the screw precision is reduced. Although it was difficult to secure the elastic member 4 in the present invention, this structure is not a small-pitch screw thread but a mating connection having a spigot portion.
The operation ring 3 is held in a state of being pressed against the fixed lens barrel 1 by utilizing the repulsion force of the above, so that the structure becomes strong against vibration and impact, and a part of the conventional helicoid focusing device is diverted. However, it is possible to provide a focusing mechanism with good molding workability and high productivity by covering the conventional disadvantages in converting the component parts into resin.
特にCCTVカメラ用レンズの標準レンズや広角レンズに
於いては製品重量も軽く、ヘリコイドの繰り返し量も1m
m以下と小さい事から、この種のレンズ鏡胴にはコスト
的にも生産性からみても最適の合焦装置である。In particular, the weight of the standard lens and wide-angle lens for CCTV cameras is light, and the helicoid repetition amount is 1 m.
Since it is as small as m or less, this type of lens barrel is the most suitable focusing device in terms of cost and productivity.
第１図は本考案を適用したCCTVカメラ用レンズ鏡胴の一
実施例の側断面図、第２図はその要部の拡大断面図であ
り、第３図は従来のヘリコイド式レンズ鏡胴の側断面図
である。 １……固定鏡胴 1a……マウントネジ 1b……インロー部 1c……当付端面 1e……キー溝 1d……受部端面 ２……鏡筒 2A……ヘリコイドネジ（オスネジ） 2e……キー部 ３……操作環 3A……ヘリコイドネジ（メスネジ） 3b……インロー部 3c……当付端面 ４……弾性部材 ５……押え環1 is a side sectional view of an embodiment of a lens barrel for a CCTV camera to which the present invention is applied, FIG. 2 is an enlarged sectional view of a main part thereof, and FIG. 3 is a conventional helicoid lens barrel. It is a side sectional view. 1 ... fixed lens barrel 1a ... mounting screw 1b ... spigot 1c ... abutting end face 1e ... keyway 1d ... receiving end face 2 ... barrel 2A ... helicoid screw (male screw) 2e ... key Part 3 Operation ring 3A Helicoid screw (female screw) 3b Inlay part 3c Contact end face 4 Elastic member 5 Pressing ring
Claims (1)
軸に沿って移動させる機構を構成する操作環３と、光学
系を保持する鏡筒２と、光学機器本体への取付部を有す
る固定鏡胴１と、操作環３を介在させ鏡筒２に一体係合
する押え環５と固定鏡胴１との間で挟持され、光軸一方
向に付勢する弾性部材４とからなり、鏡筒２と操作環３
とはヘリコイドネジにより螺合する構成を有すると共
に、操作環３と固定鏡胴１をインロー部により嵌合し、
且つ前記固定鏡胴１、鏡筒２及び操作環３の少なくとも
２つを樹脂で構成したことを特徴とする光学機器用レン
ズ鏡胴の合焦装置。An operation ring constituting a mechanism for moving an optical system along an optical axis in a lens barrel for an optical device, a lens barrel for holding the optical system, and a mounting portion to an optical device body. A fixed lens barrel 1 and an elastic member 4 sandwiched between the fixed lens barrel 1 and a pressing ring 5 integrally engaged with the lens barrel 2 with the operation ring 3 interposed therebetween and biasing in one direction of the optical axis; Lens tube 2 and operation ring 3
Has a configuration in which the operation ring 3 and the fixed lens barrel 1 are fitted by a spigot portion,
A focusing device for a lens barrel for an optical apparatus, wherein at least two of the fixed barrel 1, the barrel 2, and the operation ring 3 are made of resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990056946U JP2566088Y2 (en) | 1990-05-30 | 1990-05-30 | Focusing device for lens barrel for optical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990056946U JP2566088Y2 (en) | 1990-05-30 | 1990-05-30 | Focusing device for lens barrel for optical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0416407U JPH0416407U (en) | 1992-02-10 |
| JP2566088Y2 true JP2566088Y2 (en) | 1998-03-25 |
Family
ID=31581223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990056946U Expired - Fee Related JP2566088Y2 (en) | 1990-05-30 | 1990-05-30 | Focusing device for lens barrel for optical equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2566088Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4575114B2 (en) * | 2003-12-24 | 2010-11-04 | オリンパス株式会社 | Zoom lens barrel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615218A (en) * | 1984-06-20 | 1986-01-11 | Hitachi Ltd | Zoom lens barrel |
| JPH026915A (en) * | 1988-06-27 | 1990-01-11 | Hitachi Ltd | Lens barrel |
-
1990
- 1990-05-30 JP JP1990056946U patent/JP2566088Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0416407U (en) | 1992-02-10 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |