JP2004240360A - Guide structure and finder structure of lens group - Google Patents

Guide structure and finder structure of lens group Download PDF

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Publication number
JP2004240360A
JP2004240360A JP2003032071A JP2003032071A JP2004240360A JP 2004240360 A JP2004240360 A JP 2004240360A JP 2003032071 A JP2003032071 A JP 2003032071A JP 2003032071 A JP2003032071 A JP 2003032071A JP 2004240360 A JP2004240360 A JP 2004240360A
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JP
Japan
Prior art keywords
lens group
guide
optical axis
guide shaft
movable lens
Prior art date
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Granted
Application number
JP2003032071A
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Japanese (ja)
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JP4171318B2 (en
Inventor
Kazuki Yazawa
一樹 矢澤
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Pentax Corp
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Pentax Corp
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Publication of JP2004240360A publication Critical patent/JP2004240360A/en
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  • Viewfinders (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guide structure which can bias lenses in an optical axis direction by using one biasing means and can suppress the blurring between the lenses by imparting a turning force around a guide shaft to the lenses, and to provide a viewfinder structure. <P>SOLUTION: The guide structure has: the guide shaft which is parallel to the optical axis of a movable lens group; a movable lens group supporting frame which is slidably supported on the guide shaft; a movement biasing means which biases the movable lens group supporting frame to one side of the optical axis direction; and a turning movement biasing means which biases the turning movement of the movable lens group supporting frame around the guide shaft. A torsion coil spring having a coil section and a pair of legs extending from both ends of the coil section is used as a spring means used in common as the movement biasing means and the turning movement biasing means. The coil section of the torsion coil spring is supported around an axis orthogonal with the optical axis and the guide shaft without intersecting with these axes, and the force acting between the pair of the legs of the torsion coil spring is utilized as the movement biasing means. The force with which the legs of the torsion coil spring tends to return to a straight line is utilized as the turning movement biasing means. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【技術分野】
本発明は、内部に搭載されたレンズがその光軸方向に進退可能なレンズ群の案内構造及びファインダ構造に関する。
【０００２】
【従来技術及びその問題点】
ズーム機能を備えるファインダ構造においては、レンズ群の案内構造として、レンズを光軸方向に進退させるとともに、レンズ間のブレを抑える必要があった。
【０００３】
しかし、従来のレンズ群の案内構造においては、レンズを光軸方向に付勢する部材とレンズのブレを抑える部材を別個に設ける必要があったため、部品点数及び組み立て工数が多くならざるを得ず、コストアップの原因となっていた。
【０００４】
【特許文献】
特開平６−２５０２６３号公報
【０００５】
【発明の目的】
そこで本発明の目的は、一つの付勢部材によって、レンズを光軸方向に付勢するとともに、ガイド軸を中心とした回動力をレンズに与えてレンズ間のブレを抑えることができるレンズ群の案内構造及びファインダ構造を提供することにある。これにより、部品点数及び組み立て工程数の低減によるコストダウンを図ることができる。
【０００６】
【発明の概要】
上記問題点を解決するために、本発明のレンズ群の案内構造又はファインダ構造においては、可動レンズ群の光軸と平行なガイド軸と、このガイド軸に摺動可能に支持された、可動レンズ群の支持枠と、この可動レンズ群支持枠を光軸方向の一方に付勢する移動付勢手段と、この可動レンズ群支持枠をガイド軸を中心に回動付勢する回動付勢手段と、を有し、移動付勢手段と回動付勢手段を兼ねるばね手段として、コイル部と、このコイル部の両端部から延びる一対の脚部とを有するトーションコイルばねを用い、このトーションコイルばねのコイル部を光軸及びガイド軸と交わらずに直交する軸周りに支持し、移動付勢手段としてこのトーションコイルばねの一対の脚部間に作用する力を利用し、回動付勢手段としてこのトーションコイルばねの脚部が直線に戻ろうとする力を利用することを特徴としている。
【０００７】
一対の脚部の一方を前記ガイド軸との偏心位置において可動レンズ群支持枠に掛け止めるとともに、他方をケーシングに掛け止め、一対の脚部間に作用する力によって、可動レンズ群支持枠に軸方向移動力と回動付勢力を与えるとなおよい。
【０００８】
【発明の実施形態】
以下、本発明に係る実施形態を図１及び図２を参照しつつ詳しく説明する。本実施形態においては、本体部（ケーシング）１０、並びに、レンズ群の案内構造１として、本体部１０内に配置されたレンズ群２０、光軸方向ガイド部４０、回動方向ガイド部６０、及び、付勢部材７０、７１を備える。なお、レンズ群の案内構造１はファインダ構造を構成することができる。
【０００９】
ズームレンズを備えるカメラに装着されるレンズ群の案内構造１においては、本体部１０はその外形形状が略長方形であって、その内部には、光軸Ｏが本体部１０の長手方向に平行になるように、第１レンズ群２１、第２レンズ群２２及び第３レンズ群２３からなるレンズ群２０が配置されている。レンズ群２０は、被写体側（Ａ側）から撮影者側（Ｂ側）へ第１レンズ群２１、第２レンズ群２２、第３レンズ群２３の順に配置されており、第１レンズ群２１及び第２レンズ群２２は後述の光軸方向ガイド部４０により光軸Ｏ方向に進退可能（ズーミング可能）である。
【００１０】
光軸方向ガイド部４０は、光軸Ｏに平行に延びるガイド軸４１と、ガイド軸４１と摺動しつつ移動可能な第１レンズ支持部材（支持枠）４２及び第２レンズ支持部材４３と、本体部１０の下面に固定され、第１レンズ支持部材４２及び第２レンズ支持部材４３の動きを規制する平面状のカム部材４４と、を備えている。第１レンズ支持部材４２及び第２レンズ支持部材４３はそれぞれ、その内部にガイド軸４１を受容、摺動する中空の円筒状部材４２ａ、４３ａと、円筒状部材４２ａ、４３ａ上部に固定され、第１レンズ群２１及び第２レンズ群２２を囲むようにして固定するレンズ支持台部４２ｃ、４３ｃと、を備えている。
【００１１】
第１レンズ支持部材４２及び第２レンズ支持部材４３の下部には、それぞれ、下方に突出する円柱状部材４２ｂ及びカムフォロワ４３ｂが設けられている。第１レンズ支持部材４２は、円柱状部材４２ｂがカム部材４４の前端面４４ａに突き当たることにより、光軸Ｏ方向の移動が規制されている。一方、第２レンズ支持部材４３は、カム部材４４に設けられたカム溝４４ｂにカムフォロワ４３ｂが嵌まることによって、ガイド軸４１を中心とする回動を規制されつつ光軸Ｏ方向に移動可能である。以上の構成によって、第１レンズ支持部材４２が第１レンズ群２１を、第２レンズ支持部材４３が第２レンズ群２２をそれぞれ光軸Ｏ方向に移動可能に支持している。
【００１２】
第１レンズ支持部材４２及び第２レンズ支持部材４３を付勢する付勢部材（付勢手段）７０、７１は、それぞれ、コイル状の円環部（コイル部）７０ａ、７１ａと、円環部の両端から接線方向に延びる一対の脚部７０ｂ及び７０ｃ、７１ｂ及び７１ｃと、脚部の先端を曲げることによって設けられた掛止部７０ｄ、７１ｄと、からなるトーションバネである。脚部７０ｂと７０ｃを、又は、脚部７１ｂと７１ｃを互いに近づけるような力を加えると、それぞれを広げようとする弾性力がはたらく。
【００１３】
円環部７０ａ、７１ａは、その巻回方向が図１の紙面垂直方向と平行であり、一方の脚部７０ｂ、７１ｂが下方に延びるように、本体部１０内上部に固定された円環部取付部１１、１２に回動可能に支持されている。別言すれば、円環部７０ａ、７１ａは、光軸Ｏ及びガイド軸４１のいずれとも交わらずに直交する軸としての円環部取付部１１、１２の周りに支持されている。他方の脚部７０ｃ、７１ｃは、脚部７０ｂ、７１ｂを円環部７０ａ、７１ａに近づけるような力が脚部７０ｂ、７１ｂに加わったときに、本体部１０内上部であって円環部７０ａ、７１ａの前方に設けられた規制部材１５、１６に突き当たって円環部７０ａ、７１ａの回動を規制するように配置されている。掛止部７０ｄ、７１ｄは、脚部７０ｂ、７１ｂに対して略直角をなしている（図２）。
【００１４】
レンズ支持台部４２ｃ、４３ｃは、光軸Ｏ方向に突出した略円錐台状のボス部（突起部）４２ｄ、４３ｄを有している。ボス部４２ｄ、４３ｄには、図１の紙面奥側から手前側に向けて掛止部７０ｄ、７１ｄが掛け止められる。
【００１５】
付勢部材７０、７１は、光軸直交断面において、ガイド軸４１の鉛直上方よりやや外側に偏心した位置に配置されている。このように配置することにより、脚部７０ｂ及び７１ｂが湾曲した状態で、掛止部７０ｄ、７１ｄがボス部４２ｄ、４３ｄに掛け止められる。このため、第１レンズ支持部材４２及び第２レンズ支持部材４３は、脚部７０ｂと脚部７０ｃ、または、脚部７１ｂと脚部７１ｃが開こうとする力によって、光軸Ｏ方向のうち撮影者側に移動付勢されるとともに、脚部７０ｂ及び脚部７１ｂが直線に戻ろうとする力によってガイド軸４１を中心として回動付勢される。すなわち、付勢部材７０、７１は移動付勢手段と回転付勢手段を兼ねるバネ手段となっている。
【００１６】
一方、本体部１０内の上部には、案内溝部１３、１４及び案内腕部４２ｅ、４３ｅからなる回動方向ガイド部６０、６１が構成されている。案内溝部１３、１４は、本体部１０の上側内壁であって、光軸直交断面において付勢部材７０、７１より内側において、光軸Ｏ方向に延びるように設けられている。案内腕部４２ｅ、４３ｅは、レンズ支持台部４２ｃ、４３ｃの上部から上方に延びるように設けられており、案内溝部１３、１４に受容される。
【００１７】
付勢部材７０及び７１の弾性力によって、第１レンズ支持部材４２、第２レンズ支持部材４３にガイド軸４１の周りに回動する力が与えられると、案内腕部４２ｅ，４３ｅの付勢部材７０、７１側の端面４２ｅ１、４３ｅ１は、案内溝部１３、１４の付勢部材７０、７１側の端面１３ａ、１４ａに突き当たり、案内溝部１３、１４と案内腕部４２ｅ、４３ｅとの遊びがなくなる。このとき第１レンズ群２１及び第２レンズ群２２それぞれの光軸が光軸Ｏに一致するように構成されている。
【００１８】
以上の構成によって、一つの付勢部材７０（又は７１）によって、レンズを光軸方向に付勢するとともに、レンズにガイド軸４１を中心とした回動力を与えてレンズの位置を微調整してレンズ間のブレを抑えることができる。これにより、部品点数及び組み立て工程数の低減によるコストダウンを図ることができる。
【００１９】
本発明について上記実施形態を参照しつつ説明したが、本発明は上記実施形態に限定されるものではなく、改良の目的または本発明の思想の範囲内において改良または変更が可能である。
【００２０】
【発明の効果】
以上説明したように、本発明によると、一つの付勢部材によって、レンズを光軸方向に付勢するとともに、ガイド軸を中心とした回動力をレンズに与えてレンズ間のブレを抑えることができる。これにより、部品点数及び組み立て工程数の低減によるコストダウンを図ることができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るレンズ群の案内構造を側面から見た図である。
【図２】本発明の実施形態に係るレンズ群の案内構造の正面から見た図である。
【符号の説明】
１ レンズ群の案内構造
１０ 本体部（ケーシング）
２０ レンズ群
２１ 第１レンズ群
２２ 第２レンズ群
２３ 第３レンズ群
４１ ガイド軸
４２ 第１レンズ支持部材（支持枠）
４３ 第２レンズ支持部材（支持枠）
４２ｃ ４３ｃ 支持台部
７０ ７１ 付勢部材（付勢手段）
７０ａ ７１ａ 円環部（コイル部）
７０ｂ ７１ｂ 脚部
Ｏ 光軸[0001]
【Technical field】
The present invention relates to a guide structure and a finder structure of a lens group in which a lens mounted therein can advance and retreat in an optical axis direction.
[0002]
[Prior art and its problems]
In a finder structure having a zoom function, it is necessary to move a lens in the optical axis direction and suppress blurring between lenses as a guide structure for a lens group.
[0003]
However, in the conventional lens group guide structure, it is necessary to separately provide a member for urging the lens in the optical axis direction and a member for suppressing blurring of the lens, so that the number of parts and the number of assembly steps must be increased. , Which caused the cost to rise.
[0004]
[Patent Document]
JP-A-6-250263
[Object of the invention]
Accordingly, an object of the present invention is to provide a lens group that can urge the lens in the optical axis direction by one urging member and apply a rotational force about the guide axis to the lens to suppress blur between the lenses. It is to provide a guide structure and a finder structure. Thereby, cost reduction can be achieved by reducing the number of parts and the number of assembly steps.
[0006]
Summary of the Invention
In order to solve the above problem, in the lens group guide structure or finder structure of the present invention, a movable lens group slidably supported by a guide shaft parallel to the optical axis of the movable lens group is provided. Group support frame, moving biasing means for biasing the movable lens group support frame to one side in the optical axis direction, and rotation biasing means for rotating and biasing the movable lens group support frame about a guide shaft And a torsion coil spring having a coil portion and a pair of leg portions extending from both ends of the coil portion is used as a spring means that also serves as a moving urging means and a rotation urging means. The coil portion of the spring is supported around an axis orthogonal to the optical axis and the guide axis without intersecting with the optical axis and the guide axis, and the force acting between the pair of legs of the torsion coil spring is used as the moving urging means, and the rotation urging means is used. As this torsion coil Leg of the root is characterized by the use of force to try to return to a straight line.
[0007]
One of the pair of legs is hung on the movable lens group support frame at an eccentric position with respect to the guide shaft, and the other is hung on the casing. More preferably, a directional movement force and a rotation urging force are applied.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to the present invention will be described in detail with reference to FIGS. In the present embodiment, as the main body (casing) 10 and the lens group guide structure 1, the lens group 20, the optical axis direction guide 40, the rotation direction guide 60, and the lens group 20 disposed in the main body 10. , Biasing members 70 and 71. The guide structure 1 of the lens group can form a finder structure.
[0009]
In the guide structure 1 for a lens group mounted on a camera equipped with a zoom lens, the outer shape of the main body 10 is substantially rectangular, and the optical axis O is parallel to the longitudinal direction of the main body 10 inside. Thus, a lens group 20 including a first lens group 21, a second lens group 22, and a third lens group 23 is arranged. The lens group 20 is arranged in the order of a first lens group 21, a second lens group 22, and a third lens group 23 from the subject side (A side) to the photographer side (B side). The second lens group 22 can be advanced and retracted (zoomable) in the optical axis O direction by an optical axis direction guide section 40 described later.
[0010]
The optical axis direction guide section 40 includes a guide shaft 41 extending parallel to the optical axis O, a first lens support member (support frame) 42 and a second lens support member 43 that can move while sliding on the guide shaft 41, A planar cam member 44 fixed to the lower surface of the main body 10 and restricting movement of the first lens support member 42 and the second lens support member 43. The first lens support member 42 and the second lens support member 43 are respectively fixed to hollow cylindrical members 42a and 43a that receive and slide the guide shaft 41 therein, and are fixed to the upper portions of the cylindrical members 42a and 43a. Lens support pedestals 42c and 43c that surround and fix the first lens group 21 and the second lens group 22.
[0011]
Below the first lens support member 42 and the second lens support member 43, a columnar member 42b and a cam follower 43b projecting downward are provided, respectively. The movement of the first lens support member 42 in the optical axis O direction is restricted by the cylindrical member 42b abutting on the front end surface 44a of the cam member 44. On the other hand, the second lens support member 43 is movable in the direction of the optical axis O while the rotation about the guide shaft 41 is restricted by the cam follower 43 b fitted in the cam groove 44 b provided in the cam member 44. is there. With the above configuration, the first lens support member 42 supports the first lens group 21 and the second lens support member 43 supports the second lens group 22 movably in the optical axis O direction.
[0012]
The urging members (urging means) 70 and 71 for urging the first lens support member 42 and the second lens support member 43 are coiled annular portions (coil portions) 70a and 71a and an annular portion, respectively. Is a torsion spring including a pair of legs 70b and 70c, 71b and 71c extending in a tangential direction from both ends of the pair, and hooks 70d and 71d provided by bending the tips of the legs. When a force is applied so as to bring the legs 70b and 70c or the legs 71b and 71c closer to each other, an elastic force for expanding each of them is applied.
[0013]
The annular portions 70a and 71a are fixed to the upper portion inside the main body 10 so that the winding direction is parallel to the direction perpendicular to the plane of FIG. 1 and one of the legs 70b and 71b extends downward. It is rotatably supported by the mounting portions 11 and 12. In other words, the annular portions 70a and 71a are supported around the annular portion mounting portions 11 and 12 as axes orthogonal to each other without intersecting with the optical axis O or the guide shaft 41. The other leg 70c, 71c is located in the upper portion of the main body 10 when the force for bringing the leg 70b, 71b closer to the ring 70a, 71a is applied to the leg 70b, 71b. , 71a are arranged so as to abut against regulating members 15, 16 provided in front of the annular portions 70a, 71a. The hooks 70d, 71d are substantially perpendicular to the legs 70b, 71b (FIG. 2).
[0014]
The lens support pedestals 42c and 43c have substantially frustoconical bosses (projections) 42d and 43d protruding in the optical axis O direction. Hook portions 70d and 71d are hooked on the boss portions 42d and 43d from the back side to the front side in FIG.
[0015]
The urging members 70 and 71 are disposed at positions eccentric to a position slightly outside the vertically above the guide shaft 41 in a cross section orthogonal to the optical axis. With this arrangement, the hooks 70d and 71d are hooked on the bosses 42d and 43d in a state where the legs 70b and 71b are curved. For this reason, the first lens support member 42 and the second lens support member 43 are photographed in the optical axis O direction by the force of opening the leg 70b and the leg 70c or the leg 71b and the leg 71c. The leg 70b and the leg 71b are urged to rotate about the guide shaft 41 by the force of the leg 70b and the leg 71b returning to a straight line. That is, the urging members 70 and 71 are spring means that also serve as moving urging means and rotation urging means.
[0016]
On the other hand, in the upper part of the main body 10, turning direction guides 60 and 61 including guide grooves 13 and 14 and guide arms 42e and 43e are formed. The guide grooves 13 and 14 are provided on the upper inner wall of the main body 10 and extend in the optical axis O direction inside the urging members 70 and 71 in a cross section orthogonal to the optical axis. The guide arms 42e and 43e are provided so as to extend upward from the upper portions of the lens support bases 42c and 43c, and are received in the guide grooves 13 and 14.
[0017]
When the first lens support member 42 and the second lens support member 43 are given a rotational force around the guide shaft 41 by the elastic force of the urging members 70 and 71, the urging members of the guide arms 42e and 43e are provided. The end surfaces 42e1 and 43e1 on the 70 and 71 sides abut against the urging members 70 and 71 on the end surfaces 13a and 14a of the guide grooves 13 and 14, so that there is no play between the guide grooves 13 and 14 and the guide arms 42e and 43e. At this time, the first lens group 21 and the second lens group 22 are configured such that their optical axes coincide with the optical axis O.
[0018]
With the above configuration, the lens is urged in the optical axis direction by one urging member 70 (or 71), and the lens is finely adjusted by applying a rotating force to the lens about the guide shaft 41. Blur between lenses can be suppressed. Thereby, cost reduction can be achieved by reducing the number of parts and the number of assembly steps.
[0019]
Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment, and can be improved or changed within the scope of the purpose of improvement or the concept of the present invention.
[0020]
【The invention's effect】
As described above, according to the present invention, a single urging member urges a lens in the optical axis direction, and provides a rotational force about the guide shaft to the lens to suppress blur between the lenses. it can. Thereby, cost reduction can be achieved by reducing the number of parts and the number of assembly steps.
[Brief description of the drawings]
FIG. 1 is a side view of a guide structure for a lens group according to an embodiment of the present invention.
FIG. 2 is a front view of a lens group guide structure according to an embodiment of the present invention.
[Explanation of symbols]
1 lens group guide structure 10 main body (casing)
Reference Signs List 20 lens group 21 first lens group 22 second lens group 23 third lens group 41 guide shaft 42 first lens support member (support frame)
43 Second lens support member (support frame)
42c 43c Support base 70 71 Biasing member (biasing means)
70a 71a Annular part (coil part)
70b 71b Leg O Optical axis

Claims (3)

可動レンズ群の光軸と平行なガイド軸と、
前記ガイド軸に摺動可能に支持された、前記可動レンズ群の支持枠と、
前記可動レンズ群支持枠を光軸方向の一方に付勢する移動付勢手段と、
前記可動レンズ群支持枠を前記ガイド軸を中心に回動付勢する回動付勢手段と、
を有するレンズ群の案内構造において、
前記移動付勢手段と回動付勢手段を兼ねるばね手段として、コイル部と、前記コイル部の両端部から延びる一対の脚部とを有するトーションコイルばねを用い、前記トーションコイルばねのコイル部を光軸及びガイド軸と交わらずに直交する軸周りに支持し、
前記移動付勢手段として前記トーションコイルばねの一対の脚部間に作用する力を利用し、
前記回動付勢手段として前記トーションコイルばねの脚部が直線に戻ろうとする力を利用する、
ことを特徴とするレンズ群の案内構造。A guide axis parallel to the optical axis of the movable lens group,
A support frame for the movable lens group, slidably supported by the guide shaft,
A moving biasing unit that biases the movable lens group support frame in one direction in the optical axis direction,
Rotation urging means for urging the movable lens group support frame about the guide shaft,
In the guide structure of the lens group having
A torsion coil spring having a coil portion and a pair of legs extending from both ends of the coil portion is used as spring means that also serves as the movement urging unit and the rotation urging unit, and the coil portion of the torsion coil spring is used. Supporting around an axis orthogonal to the optical axis and guide axis without intersecting,
Utilizing a force acting between a pair of legs of the torsion coil spring as the movement urging means,
Utilizing a force of the leg of the torsion coil spring to return to a straight line as the rotation urging means,
A lens group guide structure, characterized in that: 請求項１記載のレンズ群の案内構造であって、一対の脚部の一方を前記ガイド軸との偏心位置において前記可動レンズ群支持枠に掛け止めるとともに、他方をケーシングに掛け止め、前記一対の脚部間に作用する力によって、前記可動レンズ群支持枠に前記軸方向移動力と回動付勢力を与えたことを特徴とするレンズ群の案内構造。2. The guide structure for a lens group according to claim 1, wherein one of the pair of legs is hooked on the movable lens group support frame at an eccentric position with respect to the guide shaft, and the other is hooked on a casing. 3. The guide structure for a lens group, wherein the axial movement force and the rotation urging force are applied to the movable lens group support frame by a force acting between the legs. ファインダ構造であって、請求項１又は請求項２記載のレンズ群の案内構造を備えることを特徴とするファインダ構造。A finder structure, comprising the lens group guide structure according to claim 1 or 2.
JP2003032071A 2003-02-10 2003-02-10 Lens group guide structure and viewfinder structure Expired - Fee Related JP4171318B2 (en)

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JP2010014959A (en) * 2008-07-03 2010-01-21 Hoya Corp Lens barrel
JP2013029713A (en) * 2011-07-29 2013-02-07 Hoya Corp Imaging unit
JP2014095799A (en) * 2012-11-09 2014-05-22 Hoya Corp Optical element position control mechanism
JP2014137568A (en) * 2013-01-18 2014-07-28 Hoya Corp Imaging unit

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