JP2000065182A - Helicoid screw member - Google Patents
Helicoid screw memberInfo
- Publication number
- JP2000065182A JP2000065182A JP10235970A JP23597098A JP2000065182A JP 2000065182 A JP2000065182 A JP 2000065182A JP 10235970 A JP10235970 A JP 10235970A JP 23597098 A JP23597098 A JP 23597098A JP 2000065182 A JP2000065182 A JP 2000065182A
- Authority
- JP
- Japan
- Prior art keywords
- thread
- screw
- helicoid
- helicoid screw
- screw member
- 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
Landscapes
- Lens Barrels (AREA)
- Transmission Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、互いに螺合しあ
う一対の多条ヘリコイドねじを備えたヘリコイドねじ部
材に関し、特にカメラのレンズ鏡筒の焦点調節あるいは
ズーム作動機構に最適なヘリコイドねじ部材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helicoid screw member having a pair of multi-threaded helicoid screws which are screwed together, and more particularly to a helicoid screw member most suitable for adjusting the focus of a lens barrel of a camera or a zoom operating mechanism. .
【０００２】[0002]
【従来の技術】従来、カメラのレンズ鏡筒の焦点調節あ
るいはズーム作動機構においては台形のヘリコイドねじ
が使用されている。しかしながら、そのねじ山の高さは
ピッチに比例して高くなるため、ピッチの粗い１条ねじ
ではねじ部材の肉厚が著しく大きくなる。したがって、
操作性で許容される作動回転角に対し繰出し量が大きい
ヘリコイドねじ部材には、通常多条ねじが使用されてい
る。2. Description of the Related Art Conventionally, a trapezoidal helicoid screw is used in a focus adjustment or zoom operation mechanism of a lens barrel of a camera. However, since the height of the screw thread increases in proportion to the pitch, the wall thickness of the screw member is significantly increased in the case of a single thread having a coarse pitch. Therefore,
A multi-threaded screw is usually used for a helicoid screw member having a large extension amount with respect to an operating rotation angle allowed by operability.
【０００３】図３（ａ）は、一般の１条ねじ１００の雄
ねじ１０１と雌ねじ１０２との組付断面図であり、１回
転で移動するリードＬは、１条ねじ１００のピッチＰに
等しい。これに対し、図３（ｂ）は、上記と同じリード
Ｌの２条ねじ２００の雄ねじ２０１と雌ねじ２０２との
組付断面図であり、そのピッチ及び引っかかり高さは１
条ねじ１００のピッチＰ及び引っかかり高さｈのそれぞ
れ１／２となっている。FIG. 3A is a cross-sectional view of a general single-thread screw 100 in which a male screw 101 and a female screw 102 are assembled. A lead L that moves in one rotation is equal to the pitch P of the single-thread screw 100. On the other hand, FIG. 3B is an assembled cross-sectional view of the male screw 201 and the female screw 202 of the double thread 200 of the same lead L as described above.
Each of the pitch P and the hook height h of the thread screw 100 is １ ／.
【０００４】一方、近来の電動モータで駆動し焦点調節
あるいはズーム作動を行うレンズ鏡筒にあっては、その
駆動トルクを可及的に小さくするねじ山形状が望まれて
いる。例えば特開昭６１−９８３０９号公報に示される
ものでは、ヘリコイドねじの一方を台形ねじ、他方をこ
の台形ねじに線接触する断面ほぼ半円形の丸ねじにする
ことにより摩擦抵抗を軽減する方法が提案されており、
実開昭６２−１８４５１１号公報に示されるものでは、
ねじ山先端部のねじ面を湾曲状またはねじ山面下端の傾
斜面よりも小さい角度の傾斜面にする方法が提案されて
いる。On the other hand, for a lens barrel which is driven by a recent electric motor and performs focus adjustment or zoom operation, a thread shape for minimizing the driving torque is desired. For example, Japanese Patent Application Laid-Open No. 61-98309 discloses a method for reducing frictional resistance by making one of the helicoid screws a trapezoidal screw and the other a round screw having a substantially semicircular cross section in line contact with the trapezoidal screw. Has been proposed,
In what is disclosed in Japanese Utility Model Application Laid-Open No. 62-184511,
A method has been proposed in which the thread surface at the tip of the thread is curved or inclined at an angle smaller than the slope at the lower end of the thread.
【０００５】また、レンズ鏡筒の駆動トルクが常に一定
になるよう、樹脂成形で形成する一方のヘリコイドねじ
を他方のヘリコイドねじと螺合し、且つヘリコイドねじ
の有効ねじ部の回転軸方向への長さと所定繰り出し長さ
との和以上の全長とし、他方のヘリコイドねじはその基
部を、相手方のヘリコイドねじと接触しないよう隙間を
保つように抉り取った無ねじ部とする方法も知られてい
る（実開昭６１−７９３１０号公報参照）。Further, one helicoid screw formed by resin molding is screwed with the other helicoid screw so that the driving torque of the lens barrel is always constant, and the effective screw portion of the helicoid screw is rotated in the direction of the rotation axis. There is also known a method in which the total length is equal to or greater than the sum of the length and the predetermined feeding length, and the other helicoid screw is formed as a threadless part which is hollowed out so as to keep a gap so as not to contact with a counterpart helicoid screw ( See JP-A-61-79310).
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、このよ
うな従来のヘリコイドねじ部材にあって、樹脂成形で形
成するヘリコイドねじ部材は、その機能精度を機械加工
により形成したヘリコイドねじ部材と同等に仕上げるに
は、単価の高い高品質な材料を使用する必要があり、金
型製作時には、設計値と実際の成形品の測定値を照合
し、所望の精度範囲になるまで何度か試作金型を修正せ
ねばならず、時間と手間がかかるなど非効率的で総ロッ
ト数が小さい製品には不適であった。However, in such a conventional helicoid screw member, the helicoid screw member formed by resin molding has the same functional accuracy as that of the helicoid screw member formed by machining. Requires the use of high-quality materials with high unit prices.When manufacturing dies, the design values are compared with the measured values of actual molded products, and the prototype dies are corrected several times until the desired accuracy range is achieved. This is inefficient and requires time and effort, and is not suitable for products with a small total number of lots.
【０００７】一方、機械加工で特殊ねじ山を形成するも
のでは、形状に合わせた総型バイトのような特殊工具に
よる加工が必要であり、形成可能なねじ山形状に制限が
あり、また、工具の耐久性の点から高価な特殊工具の予
備を複数用意しなければならず、樹脂成形で形成する場
合に較べコスト高となり総ロット数が大きい製品には不
適であった。On the other hand, when a special thread is formed by machining, machining with a special tool such as a full-size cutting tool is required, which limits the shape of the thread that can be formed. In view of the durability, it is necessary to prepare a plurality of expensive special tool spares, so that the cost is higher than in the case of forming by resin molding, which is not suitable for a product having a large total number of lots.
【０００８】また、機械加工によるねじの特殊ねじ山形
状の形成は、加工工程で複数のバイトを交換するため複
数回の段取り代えをしなければならない場合が多く、１
回の段取りで加工するねじ山形成に比べ精度が低下し、
工数が多くコスト高になる点にも問題があった。[0008] Also, in forming a special thread shape of a screw by machining, it is often necessary to change a plurality of times in order to exchange a plurality of cutting tools in a machining process.
Accuracy is lower than thread forming which is processed by multiple setups,
There was also a problem in that the number of steps was large and the cost was high.
【０００９】この発明は上記の点に鑑みてなされたもの
であり、通常の工具による機械加工で、駆動トルクが小
さく精度の高い多条ヘリコイドねじを、少ない段取り工
数で形成することができるヘリコイドねじ部材を提供す
ることを目的とする。The present invention has been made in view of the above points, and a helicoid screw capable of forming a high-precision multi-row helicoid screw with a small driving torque and a small number of setup man-hours by machining with a normal tool. An object is to provide a member.
【００１０】[0010]
【課題を解決するための手段】この発明は上記の目的を
達成するため、互いに螺合して相対回転することによ
り、一方が他方を回転軸方向へ繰り出す多条ヘリコイド
ねじを、金属材料の機械加工により形成したヘリコイド
ねじ部材であって、上記多条ヘリコイドねじの一方のね
じ山の少なくとも１条を間引いて無ねじ部とし、他方を
通常の多条ヘリコイドねじとしたヘリコイドねじ部材を
提供するものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a multi-strand helicoid screw in which one is screwed together and rotated relative to the other to rotate the other in the direction of the rotation axis. A helicoid screw member formed by processing, wherein at least one thread of one of the above-mentioned multi-row helicoid screw is thinned to form a threadless portion, and the other is provided as a normal multi-row helicoid screw. It is.
【００１１】[0011]
【発明の実施の形態】以下、この発明の実施形態を図面
に基づいて具体的に説明する。図１は、この発明の第１
実施形態を示す組付断面図、図２は、この発明の他の実
施形態を示す組付断面図である。Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is an assembled sectional view showing an embodiment, and FIG. 2 is an assembled sectional view showing another embodiment of the present invention.
【００１２】図１において、金属材料の機械加工により
形成した３条のヘリコイドねじを有するヘリコイドねじ
部材１０は、その雄ねじ１１の２，３条目のねじ山１１
ｂ，１１ｃを相手方のヘリコイドねじと接触せず隙間を
保つように抉り取り、１条目のねじ山１１ａは標準のね
じ山とし、ねじ山１２ａ，１２ｂ，１２ｃがすべて標準
の雌ねじ１２とを螺合させたものである。In FIG. 1, a helicoid screw member 10 having three helicoid screws formed by machining a metal material has a thread 11 of the second and third threads of its male screw 11.
The first and second threads 11a, 12b, and 12c are threadedly engaged with the standard female thread 12 by digging the b and 11c so as to keep a gap without making contact with the counterpart helicoid thread. It was made.
【００１３】このような構成によれば、雄ねじ１１の
２，３条目のねじ山１１ｂ，１１ｃは雌ねじ１２のねじ
山１２ａ，１２ｂ，１２ｃに摺接しない無ねじ部とな
り、螺合摩擦抵抗は１／３に減少する。同時に、無ねじ
部により生ずる空隙部がグリス溜まりとなり、作動の円
滑度や耐摩耗性も向上する。According to such a configuration, the second and third threads 11b and 11c of the male screw 11 are non-threaded portions which do not slide on the threads 12a, 12b and 12c of the female screw 12, and the screw frictional resistance is one. / 3. At the same time, the gap formed by the threadless portion becomes a grease pool, and the smoothness of operation and wear resistance are improved.
【００１４】図２は、２条のヘリコイドねじを有するヘ
リコイドねじ部材２０の１条目の溝２１ａは標準とし、
２条目のねじ山２１ｂを相手方のヘリコイドねじと接触
せず隙間を保つように抉り取った雄ねじ２１と、ねじ山
２２ａ，２２ｂがすべて標準の雌ねじ２２とを螺合させ
たものである。FIG. 2 shows that the first groove 21a of the helicoid screw member 20 having two helicoid screws is standard,
The external thread 21 is obtained by cutting off the second thread 21b so as to keep a gap without making contact with the counterpart helicoid screw, and the threads 22a and 22b are all screwed together with a standard internal thread 22.
【００１５】このような構成によれば、雄ねじ２１の２
条目のねじ山２１ｂは雌ねじ２２のねじ山２２ａ，２２
ｂに摺接しない無ねじ部となり、螺合摩擦抵抗は１／２
に減少する。同時に、無ねじ部により生ずる空隙部がグ
リス溜まりとなり、作動の円滑度や耐摩耗性も向上す
る。According to such a configuration, the external thread 21-2
The threads 21b of the thread are the threads 22a, 22 of the female screw 22.
b) is a threadless part that does not slide on b.
To decrease. At the same time, the gap formed by the threadless portion becomes a grease pool, and the smoothness of operation and wear resistance are improved.
【００１６】[0016]
【発明の効果】以上述べたように、この発明によるヘリ
コイドねじ部材は、螺合摩擦抵抗の軽減を、従来の樹脂
成形のヘリコイドねじで有効な特殊ねじの山形の形成で
なく、機械加工により形成する多条ヘリコイドねじの、
少なくとも１条を無ねじ部とすることによって、コス
ト、精度及び機構の簡単さなど何ら特別に変化させるこ
となく実現可能となる。As described above, the helicoid screw member according to the present invention is capable of reducing the screwing frictional resistance by forming a special screw thread which is effective with a conventional resin-molded helicoid screw, but by machining. Of a multi-section helicoid screw
By using at least one threadless portion, it can be realized without any special change in cost, accuracy, and simplicity of the mechanism.
【００１７】また、無ねじ部により生じる空隙部は潤滑
用のグリス溜まりとなり、その塗布量を管理することに
より作動の円滑度や耐摩耗性も向上する。そして、無ね
じ部の形成によりヘリコイド部材の重量が軽減し携帯性
も良好となる。Further, the voids formed by the unthreaded portions serve as grease pools for lubrication, and the smoothness of operation and abrasion resistance are improved by controlling the amount of grease to be applied. The formation of the threadless portion reduces the weight of the helicoid member and improves portability.
【００１８】さらに、数値制御の加工機によって段取り
１工程ですべて加工可能な形状であるため作業性が良好
である。同時に、機械加工による形成品は樹脂成形品と
比べて温度特性が優れているので余分な品質試験を必要
としない。Furthermore, the workability is good because the shape is such that it can be all processed in one setup step by a numerically controlled processing machine. At the same time, the machined product has better temperature characteristics than the resin molded product, and therefore does not require an extra quality test.
【図１】この発明の一実施形態を示す組付断面図であ
る。FIG. 1 is an assembled sectional view showing an embodiment of the present invention.
【図２】この発明の他の実施形態を示す組付断面図であ
る。FIG. 2 is an assembled cross-sectional view showing another embodiment of the present invention.
【図３】従来のヘリコイドねじ部材の一例を示す組付断
面図である。FIG. 3 is an assembled sectional view showing an example of a conventional helicoid screw member.
１０，２０：ヘリコイドねじ部材 １１，２１：雄ねじ １２，２２：雌ねじ 10, 20: helicoid screw member 11, 21: male screw 12, 22: female screw
Claims (1)
り、一方が他方を回転軸方向へ繰り出す多条ヘリコイド
ねじを、金属材料の機械加工で形成したヘリコイドねじ
部材であって、 上記多条ヘリコイドねじの、一方のねじ山の少なくとも
１条を間引いて無ねじ部とし、他方を通常の多条ヘリコ
イドねじとしたことを特徴とするヘリコイドねじ部材。1. A helicoid screw member formed by machining a metal material, wherein a multi-strand helicoid screw, one of which is screwed and rotated relative to another so as to extend the other in the direction of the rotation axis, is provided. A helicoid screw member characterized in that at least one thread of one of the threads is thinned to form a threadless portion and the other is a normal multi-thread helicoid screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10235970A JP2000065182A (en) | 1998-08-21 | 1998-08-21 | Helicoid screw member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10235970A JP2000065182A (en) | 1998-08-21 | 1998-08-21 | Helicoid screw member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000065182A true JP2000065182A (en) | 2000-03-03 |
Family
ID=16993913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10235970A Pending JP2000065182A (en) | 1998-08-21 | 1998-08-21 | Helicoid screw member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000065182A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005157290A (en) * | 2003-10-30 | 2005-06-16 | Hitachi Maxell Ltd | Camera |
| JP2008128151A (en) * | 2006-11-23 | 2008-06-05 | Otics Corp | Rocker arm |
| JP2015203422A (en) * | 2014-04-10 | 2015-11-16 | 本田技研工業株式会社 | Telescopic actuator |
-
1998
- 1998-08-21 JP JP10235970A patent/JP2000065182A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005157290A (en) * | 2003-10-30 | 2005-06-16 | Hitachi Maxell Ltd | Camera |
| JP2008128151A (en) * | 2006-11-23 | 2008-06-05 | Otics Corp | Rocker arm |
| JP2015203422A (en) * | 2014-04-10 | 2015-11-16 | 本田技研工業株式会社 | Telescopic actuator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1035355B1 (en) | Rotation stop device | |
| CN100590326C (en) | Combination of multi-pitch screw and multi-pitch nut, and method of manufacturing multi-pitch nut | |
| US4486135A (en) | Tapping screw | |
| KR101207884B1 (en) | Method for producing gear | |
| JP2004162906A (en) | Self tapping screw | |
| EP1193404A1 (en) | Tapping screw | |
| JPH09242839A (en) | Whirl-stopping mechanism for screw type linearly operating machine | |
| JP2000065182A (en) | Helicoid screw member | |
| JP5686395B1 (en) | Nut processing method for sliding screw device | |
| JP3411764B2 (en) | Method for manufacturing mold for molding lens barrel made of synthetic resin having helicoid | |
| JP2000065181A (en) | Helicoid screw member | |
| CN104249233B (en) | Multi-mode rolling tool | |
| US5842923A (en) | Screw and method for its production | |
| US7927221B2 (en) | Tool and method for the production of a thread | |
| US6708544B2 (en) | Thread rolling die and process for the production thereof | |
| JPH02146513A (en) | Lens barrel | |
| JPH09133195A (en) | Ball screw and manufacture thereof | |
| CN1015243B (en) | Vulcanized model for tyre | |
| JP2012067789A (en) | Weight reducing fastening member and method of manufacturing the fastening member | |
| US20040021022A1 (en) | Face gear and method of manufacturing the same | |
| JP5229909B2 (en) | Spinning method and apparatus | |
| JPS6198309A (en) | Focusing mechanism in photographic lens barrel | |
| JP2000153423A (en) | Multi-shaft screw-shaped machine | |
| JPH06173925A (en) | Screw | |
| RU2470198C1 (en) | Movable threaded connection with load equalisation along thread turns |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050722 |
|
| RD05 | Notification of revocation of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7425 Effective date: 20060915 |
|
| A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A711 Effective date: 20061227 |
|
| RD02 | Notification of acceptance of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7422 Effective date: 20080205 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20080513 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20080515 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20080916 |