JPS61167913A - Lens barrel - Google Patents
Lens barrelInfo
- Publication number
- JPS61167913A JPS61167913A JP756385A JP756385A JPS61167913A JP S61167913 A JPS61167913 A JP S61167913A JP 756385 A JP756385 A JP 756385A JP 756385 A JP756385 A JP 756385A JP S61167913 A JPS61167913 A JP S61167913A
- Authority
- JP
- Japan
- Prior art keywords
- helicoid
- optical axis
- screw
- lens barrel
- divided
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、カメラ等のレンズ鏡胴に関し、詳しくは光軸
周りの内ねじを有する部材と外ねじを有する部材とが螺
合して、一方の部材の光軸周シの回転によシ他方の部材
が光軸方向に進退する移動機構を用いたレンズ鏡胴に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens barrel for a camera or the like, and more specifically, a member having an internal thread around an optical axis and a member having an external thread are screwed together. The present invention relates to a lens barrel using a moving mechanism in which rotation of one member around the optical axis causes the other member to advance and retreat in the optical axis direction.
レンズ鏡胴の上述のようなねじはへリコイドねじと呼ば
れ、従来は殆んどが金属材料から成る部材に切削加工に
よって形成していた。しかし、最近ではコストの低減や
軽量化を目的として、ヘリコイドねじを有する部材をプ
ラスチックのモールド成形で一体に作るようになって来
ている。それには光軸を含む面で２分割される外型と中
子との組合せから成る成形型が用いられる。この場合、
特に内ねじを有する部材の成形においては、中子が外周
にヘリコイドねじを有するため、成形後の中子の取り外
しを回転による螺進によって行わねばならないと言う問
題がある。この問題を解消する方法として、実開１ｉＨ
５６−１４５００６号公報に記載しているヘリコイドね
じを周方向で一部ねじの無い構造にする方法やＤＭＥ社
のコラプシブルコアによる方法あるいはガイヤー社のデ
ィ・モールド法等が知られている。しかし、実開昭５６
−１４５００６号公報記載の方法は、ヘリコイドねじが
少くとも半分以上ねじの無い部分を有することになシ、
そのためにガタが生じ易くなったシ、ガタ量が方向によ
って変化し易くなったシする。また、上述の方法に共通
の問題として、ねじの合わせ誤差によりねじ上に段差が
生じ易く、外型が２分割の割シ型であるため構造が複雑
で高価になると言う問題がある。The above-mentioned thread of the lens barrel is called a helicoid thread, and has conventionally been formed by cutting a member made mostly of metal material. However, recently, for the purpose of reducing costs and weight, members having helicoid screws have been made integrally by plastic molding. For this purpose, a mold consisting of a combination of an outer mold and a core, which is divided into two along a plane including the optical axis, is used. in this case,
Particularly in the molding of a member having an internal thread, since the core has a helicoidal thread on the outer periphery, there is a problem in that the core must be removed after molding by screwing through rotation. As a way to solve this problem, the practical 1iH
Known methods include a method of making a helicoid screw partially threadless in the circumferential direction as described in Japanese Patent No. 56-145006, a method using a collapsible core from DME, and a D-mold method from Geyer. However, in 1987,
- The method described in Publication No. 145006 requires that the helicoid screw has at least half a portion without a screw,
As a result, backlash is more likely to occur, and the amount of backlash is more likely to change depending on the direction. Further, as a common problem with the above-mentioned methods, there is a problem that a step is likely to be formed on the screw due to a screw alignment error, and the structure is complicated and expensive because the outer mold is a two-piece split mold.
本発明は、上述の問題の解消を目的としてなさねじが完
全に連続して精度よく円滑にヘリコイド雄ねじを有する
部材と螺合するレンズ鏡胴を提供するものである。The present invention aims to solve the above-mentioned problems by providing a lens barrel in which a blank thread is completely continuous, precisely and smoothly screwed into a member having a helicoidal male thread.
本発明は、光軸周りの内ねじを有する部材と外ねじを有
する部材とが螺合して、一方の部材の光軸周りの回転に
よシ他方の部材が光軸方向に進退する移動機構を用いた
レンズ鏡胴において、前記内ねじを有する部材が光軸に
平行な面で２分割した分割部材の結合から成ることを特
徴とするレンズ鏡胴にあり、この構成によって上記目的
を達成する。The present invention provides a moving mechanism in which a member having an internal thread around an optical axis and a member having an external thread are screwed together, and as one member rotates around the optical axis, the other member advances and retreats in the optical axis direction. The lens barrel is characterized in that the member having the internal thread is formed by joining two divided members in a plane parallel to the optical axis, and this structure achieves the above object. .
以下、本発明を図示例によって説明する。 The present invention will be explained below using illustrated examples.
第１図は本発明レンズ鏡胴の例を示す部分断面図、第２
図はへリコイド雌ねじを有する部材の例を示す構成斜視
図である。Fig. 1 is a partial sectional view showing an example of the lens barrel of the present invention;
The figure is a structural perspective view showing an example of a member having a helicoid female thread.
図において、１は固定胴、２は固定胴１に係合して光軸
周りに回転し得るフォーカシングリング、３はその孔３
ａに７オ〜カシングリング２のピン２ａが係合してフォ
ーカシングリング２と一体に回転するヘリコイド雌ねじ
３ｂを有するヘリコイドリング、４は光軸に平行な案内
溝４ａに固定胴１と一体的なガイドバー１ａが係合し、
ヘリコイド雄ねじ４ｂがヘリコイドリングのへリコイド
雌ねじ３ｂと螺合していることによってフォーカシング
リング２を回転すると光軸方向に進退するようになるレ
ンズ枠である。In the figure, 1 is a fixed barrel, 2 is a focusing ring that engages with the fixed barrel 1 and can rotate around the optical axis, and 3 is a hole 3 thereof.
A is a helicoid ring having a helicoid female screw 3b which is engaged with the pin 2a of the focusing ring 2 and rotates integrally with the focusing ring 2; The guide bar 1a is engaged,
The helicoid male screw 4b is screwed into the helicoid female screw 3b of the helicoid ring, so that when the focusing ring 2 is rotated, the lens frame moves forward and backward in the optical axis direction.
ヘリコイドリング３は第２図に示したように光軸を含む
断面で２分割したような分割部材３）゜３２０結合から
成り、その結合は前記断面に互いに設けたビン３３と孔
３４を係合させて、前記断面の外側胴部に互いに設けた
右型突片３５と係合凹部３６から成るスナツプフィツト
を係合させることによシ行われる。このビン３３とに光
軸方向の位置決めを行うものであるが、さらに光軸に直
角方向の位置決めまで行うものでもよい。また、右型突
片３５と係合凹部３６の係合は、右型突片３５を弾性変
形させて外側に開かないことには分割部材３）と３２の
分離ができないように結合するものであるが、ヘリコイ
ドリング３をレンズ鏡胴に組込んだ状態では分割部材３
）と３２が分離することはないから、このような保合手
段を省略することはできるし、あるいは右型突片３５と
係合凹部３６の光軸方向幅を一致させて、分割部材３）
と３２の光軸方向の位置決めまでも行うものとすること
ができる。この場合は、前述のビン３３七孔３４は不要
となる。As shown in FIG. 2, the helicoid ring 3 consists of a divided member 3) divided into two parts in a cross section including the optical axis, and the joint is formed by engaging a bottle 33 and a hole 34 provided mutually in the cross section. This is then carried out by engaging a snap fit consisting of a right protrusion 35 and an engagement recess 36 that are mutually provided on the outer body of the cross section. Although the bin 33 is positioned in the optical axis direction, it may also be positioned in a direction perpendicular to the optical axis. Furthermore, the engagement between the right protrusion 35 and the engagement recess 36 is such that the split members 3) and 32 cannot be separated unless the right protrusion 35 is elastically deformed and opened outward. However, when the helicoid ring 3 is assembled into the lens barrel, the split member 3
) and 32 are never separated, it is possible to omit such a retaining means, or alternatively, by making the widths of the right protruding piece 35 and the engaging recess 36 the same in the optical axis direction, the dividing member 3)
It is also possible to perform positioning in the optical axis direction of and 32. In this case, the aforementioned bottle 33 and seven holes 34 become unnecessary.
へりコイドリンク３を上述のような分割構造にすると、
分割部材３）と３２をグラスチックのモールド成形で作
った場合に、それぞれの成形型における外周にヘリコイ
ドねじを有する中子を成形後に光軸を含む面やピン３３
．孔３４ｖ？を形成した上型と同様に簡単に取シ外すこ
とができ、完全なヘリコイドねじを有する中子を共通に
用い得るだけでｋく、図示例では分割部材３）と３２に
同じ型を用いることができる。If the helicoid link 3 has a split structure as described above,
When the split members 3) and 32 are made by glass molding, after molding a core with a helicoid screw on the outer periphery of each mold, the surface containing the optical axis and the pin 33 are molded.
．． Hole 34v? In the example shown, the same mold can be used for the split members 3) and 32. Can be done.
〔発明の効果〕
本発明のレンズ鏡胴においては、ヘリコイドｈねじを有
する部材が光軸を含む面で２分割したような分割部材の
結合から成るため、それら分割部材をプラスチックの成
形品で作った場合に、中子の取シ外しを光軸に直角の方
向に簡単に行うことができ、成形型が簡単な構造で比較
的安価に得られ、ヘリコイド雌ねじが完全に連続してヘ
リコイドねじによる移動がガタなく円滑に行われると言
う優れた効果が得られる。なお、分割部材のモールド成
形はプラスチックに限られるものでないことは勿論であ
る。[Effects of the Invention] In the lens barrel of the present invention, since the member having the helicoid H screw is formed by joining two divided members in a plane including the optical axis, these divided members are made of plastic molded parts. The core can be easily removed in the direction perpendicular to the optical axis, the mold has a simple structure and is relatively inexpensive, and the helicoidal female thread is completely continuous. An excellent effect can be obtained in that movement is performed smoothly without any play. It goes without saying that the molding of the divided members is not limited to plastic.
第１図は本発明レンズ鏡胴の例を示す部分断面図、第２
図はへリコイド雌ねじを有する部材の例を示す構成斜視
図である。
１−・・固定胴、
２・・・７オーカシングリング、
３・・・ヘリコイドリング、３ｂ・・・ヘリコイド雌ね
じ、３） 、３２・・・分割部材、 ３３・・・ピン
、３４・・・孔、 ３５・・・右型突片、
３６・・・係合凹部、 ４・・・レンズ枠。Fig. 1 is a partial sectional view showing an example of the lens barrel of the present invention;
The figure is a structural perspective view showing an example of a member having a helicoid female thread. 1-... Fixed barrel, 2... 7 orcasing ring, 3... Helicoid ring, 3b... Helicoid female thread, 3), 32... Divided member, 33... Pin, 34... Hole, 35...Right protrusion piece,
36... Engagement recess, 4... Lens frame.
Claims (4)
部材とが螺合して、一方の部材の光軸周りの回転により
他方の部材が光軸方向に進退する移動機構を用いたレン
ズ鏡胴において、前記内ねじを有する部材が光軸に平行
な面で２分割した分割部材の結合から成ることを特徴と
するレンズ鏡胴。(1) A moving mechanism is used in which a member with an internal thread around the optical axis and a member with an external thread are screwed together, and the rotation of one member around the optical axis causes the other member to move forward and backward in the optical axis direction. A lens barrel, characterized in that the member having the internal thread is formed by joining two divided members in a plane parallel to the optical axis.
ある特許請求の範囲第１項記載のレンズ鏡胴。(2) The lens barrel according to claim 1, wherein the dividing member is a plastic molded product.
孔とが設けられており、結合に際して突起が孔に係合し
て少くとも光軸方向の位置合せがなされる特許請求の範
囲第１項または第２項記載のレンズ鏡胴。(3) A protrusion and a hole in which the protrusion engages are provided on the coupling end surface of the split member, and the protrusion engages with the hole during coupling to achieve alignment at least in the optical axis direction. The lens barrel according to item 1 or 2.
たスナツプフイツトの係合により行われる特許請求の範
囲第１項乃至第３項のいずれかに記載のレンズ鏡胴。(4) The lens barrel according to any one of claims 1 to 3, wherein the divided members are joined by engagement of a snap fit provided on the outer body of the divided member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP756385A JPS61167913A (en) | 1985-01-21 | 1985-01-21 | Lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP756385A JPS61167913A (en) | 1985-01-21 | 1985-01-21 | Lens barrel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61167913A true JPS61167913A (en) | 1986-07-29 |
Family
ID=11669266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP756385A Pending JPS61167913A (en) | 1985-01-21 | 1985-01-21 | Lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61167913A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009106791A (en) * | 2007-10-26 | 2009-05-21 | Fuji Filter Kogyo Kk | Continuous filter apparatus and continuous filtering method |
-
1985
- 1985-01-21 JP JP756385A patent/JPS61167913A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009106791A (en) * | 2007-10-26 | 2009-05-21 | Fuji Filter Kogyo Kk | Continuous filter apparatus and continuous filtering method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR940002265B1 (en) | Optical apparatus having a mount | |
| JP2008165249A (en) | Manufacturing method of bayonet mount and bayonet mount | |
| JPH0315001A (en) | Coupling structure for plastic lens | |
| JPH0557760A (en) | Injection mold having undercut part | |
| US4385023A (en) | Method of making a lens barrel assembly | |
| US5255124A (en) | Cam ring of lens barrel and method for manufacturing same | |
| JPS604768B2 (en) | Manufacturing method of lens barrel unit | |
| JPS61167913A (en) | Lens barrel | |
| US5066103A (en) | Helicoid threaded tube of synthetic resin and lens barrel comprising it | |
| US6594088B2 (en) | Method for molding cam ring with convex cams, molding die assembly, and molded cam ring | |
| JP2528814B2 (en) | Lens barrel | |
| JPH0727158B2 (en) | Optical equipment | |
| JPH0233205Y2 (en) | ||
| KR970001594Y1 (en) | A helicoid structure for fabrication of video camera | |
| JPH08276470A (en) | Injection mold | |
| JPH0854552A (en) | Lens holder | |
| JPH04125605A (en) | Lens moving device | |
| JPH0618757A (en) | Cam ring for lens barrel | |
| US4822138A (en) | Lens tube unit and method for producing the same | |
| US6714358B2 (en) | Lens barrel, and cam barrel molding die | |
| JPS6241289Y2 (en) | ||
| JPS58145430A (en) | Injection molding method | |
| JPS5855905A (en) | Lens barrel | |
| JPH0417923Y2 (en) | ||
| GB2229016A (en) | Manufacturing cam ring of lens barrel |