JP4966615B2 - Lens barrel and imaging device - Google Patents

Lens barrel and imaging device Download PDF

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JP4966615B2
JP4966615B2 JP2006251945A JP2006251945A JP4966615B2 JP 4966615 B2 JP4966615 B2 JP 4966615B2 JP 2006251945 A JP2006251945 A JP 2006251945A JP 2006251945 A JP2006251945 A JP 2006251945A JP 4966615 B2 JP4966615 B2 JP 4966615B2
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cylinder
lens
rotating
optical axis
lens barrel
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JP2008070846A (en
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徹也 岩▲さき▼
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Ricoh Co Ltd
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Description

本発明はデジタルカメラ、ビデオカメラ、銀塩カメラ等のズーム機構を備えた撮像装置に装備されるレンズ鏡胴の改良に関するものである。   The present invention relates to an improvement of a lens barrel provided in an imaging apparatus having a zoom mechanism such as a digital camera, a video camera, and a silver salt camera.

デジタルカメラ、ビデオカメラ、銀塩カメラ等のズーム機構を備えた撮影装置に装備されるレンズ鏡胴として、撮像素子と、撮像素子に対して被写体像を結像するための複数のレンズと、複数のレンズを所定の位置に進退移動させるためのレンズ駆動装置と、を備えたものが知られている。
近年のコンパクトカメラに用いられるレンズ駆動装置としては、光軸と平行な中心軸を中心として回転することにより光軸方向に進退する１つ以上の回転筒と、回転せずに光軸方向に進退する１つ以上の直進ガイド筒と、回転せずにレンズを保持して光軸方向に進退する１つ以上のレンズ保持筒等により構成され、非使用時には短く収納され、使用時には光軸方向に伸長することにより各レンズを所定の位置に保持し所定の焦点距離とするタイプが知られている。 As a lens barrel equipped in a photographing apparatus equipped with a zoom mechanism such as a digital camera, a video camera, a silver salt camera, etc., an imaging device, a plurality of lenses for forming a subject image on the imaging device, and a plurality of lenses And a lens driving device for moving the lens forward and backward to a predetermined position are known.
Lens drive devices used in recent compact cameras include one or more rotating cylinders that advance and retract in the optical axis direction by rotating around a central axis parallel to the optical axis, and advance and retract in the optical axis direction without rotating. One or more straight guide cylinders and one or more lens holding cylinders that hold the lens without rotating and move back and forth in the optical axis direction, and are stored short when not in use, and in the optical axis direction when in use A type is known in which each lens is held at a predetermined position by extending so as to have a predetermined focal length.

また、カメラの小型化に伴ってレンズ鏡胴の小型化も急速に進んでおり、回転筒を２つ以上持つ多段沈胴型のレンズ鏡胴が開発されている。例えば、特開２００６−０３９１５３には、最前方のレンズ群と、レンズ群を保持する第１レンズ枠とを備え、２つの回転筒と２つの直進ガイド筒と１つの固定筒により第１レンズ枠を保持して進退するように構成したレンズ鏡胴が開示されている。
小型化のための多段沈胴化は、レンズの移動距離を確保するためには非常に優れた手段ではあるが、段数の増大に伴って光軸方向から見たレンズ鏡胴の投影面積（外径寸法）はそのまま厚さの増加分だけ増大してゆくことになる。投影面積を小さくするためには、各段を構成する筒部材の厚さを薄くする必要がある。しかし、各筒部材を薄くすると落下等によって衝撃が加わった際に破壊し易くなる虞がある。 In addition, with the miniaturization of cameras, the miniaturization of lens barrels is rapidly progressing, and multistage collapsible lens barrels having two or more rotating cylinders have been developed. For example, Japanese Patent Application Laid-Open No. 2006-039153 includes a foremost lens group and a first lens frame that holds the lens group, and includes a first lens frame that includes two rotating cylinders, two rectilinear guide cylinders, and one fixed cylinder. A lens barrel configured to move forward and backward while holding is disclosed.
Multi-stage collapsible for miniaturization is a very good way to secure the lens moving distance, but as the number of steps increases, the projected area (outer diameter) of the lens barrel viewed from the optical axis direction The dimension) increases as much as the thickness increases. In order to reduce the projected area, it is necessary to reduce the thickness of the cylindrical member constituting each stage. However, if each cylindrical member is made thin, it may be easily broken when an impact is applied by dropping or the like.

図５に特開２００６−０３９１５３によって開示されているレンズ鏡胴と同様の構成を備えたレンズ鏡胴の断面（繰り出し時及び沈胴状態）を示す。第１レンズ群１はその外周縁を第１レンズ保持筒５によって保持され、第１レンズ保持筒５はその外周側を第２回転筒６により保持されると共に内周側を第２直進ガイド筒７により保持され、第２回転筒６は第１直進ガイド筒９の内径に形成されたヘリコイド９Ａと嵌合し、第２直進ガイド筒７は第２回転筒６の回転を許容しつつ第１直進ガイド筒９によって直進移動できるように保持されている。第１回転筒８の一部は固定筒１０の内径に形成されたヘリコイド１０ａと嵌合することにより回転可能に支持されている。第１直進ガイド筒９は、第１回転筒８の回転を許容しつつ固定筒１０によって直進移動できるように保持されている。第１回転筒８の内径には光軸方向と直交する内壁面を有した回転キー溝８ａが設けられており、第１直進ガイド筒９の外周面に設けた回転キー９ｂがこの回転キー溝８ａ内に嵌合することで、第１回転筒８と第１直進ガイド筒９とは相対回転しつつ光軸方向に移動する。第１回転筒８と第２回転筒６とは、第１回転筒８の回転力を伝えるための図示しない回転駆動ピンにより連結されており、第１回転筒８を回転することで夫々がヘリコイド嵌合により光軸方向に進退することができる。また、第１レンズ保持筒５はその外周部にレンズ駆動ピンを持ち、このレンズ駆動ピンが第２回転筒６の内径に設けられたカム溝と係合し、且つ第１レンズ保持筒５は第２直進ガイド筒７とは光軸方向に設けたガイド溝で嵌合することでカム形状に合った位置にレンズを移動させることができる。   FIG. 5 shows a cross section of the lens barrel having the same configuration as the lens barrel disclosed in Japanese Patent Application Laid-Open No. 2006-039153 (when extended and retracted). The outer periphery of the first lens group 1 is held by a first lens holding cylinder 5, and the outer periphery of the first lens holding cylinder 5 is held by a second rotating cylinder 6 and the inner periphery of the first lens group 1 is a second rectilinear guide cylinder. 7, the second rotary cylinder 6 is fitted with a helicoid 9 </ b> A formed on the inner diameter of the first rectilinear guide cylinder 9, and the second rectilinear guide cylinder 7 is allowed to rotate the second rotary cylinder 6 while allowing the first rotary cylinder 6 to rotate. The straight guide tube 9 is held so that it can move straight. A part of the first rotating cylinder 8 is rotatably supported by fitting with a helicoid 10 a formed on the inner diameter of the fixed cylinder 10. The first rectilinear guide cylinder 9 is held so that it can be moved linearly by the fixed cylinder 10 while allowing the first rotating cylinder 8 to rotate. A rotation key groove 8 a having an inner wall surface orthogonal to the optical axis direction is provided on the inner diameter of the first rotation cylinder 8, and the rotation key 9 b provided on the outer peripheral surface of the first rectilinear guide cylinder 9 is the rotation key groove. By fitting in 8a, the first rotating cylinder 8 and the first rectilinear guide cylinder 9 move in the optical axis direction while relatively rotating. The first rotary cylinder 8 and the second rotary cylinder 6 are connected by a rotation drive pin (not shown) for transmitting the rotational force of the first rotary cylinder 8, and each of the first rotary cylinder 8 and the second rotary cylinder 6 is a helicoid by rotating the first rotary cylinder 8. It can be advanced and retracted in the optical axis direction by fitting. The first lens holding cylinder 5 has a lens driving pin on its outer peripheral portion, and this lens driving pin engages with a cam groove provided on the inner diameter of the second rotating cylinder 6, and the first lens holding cylinder 5 The lens can be moved to a position suitable for the cam shape by fitting with the second rectilinear guide tube 7 by a guide groove provided in the optical axis direction.

以上の構成において、第１レンズ保持筒５に光軸方向前方から図中の矢印方向に負荷Ｆが掛かったとき、その力は第２回転筒６を伝わって、ヘリコイド９Ａを介して第１直進ガイド筒９に加わる。衝撃等負荷が強い場合には、第１直進ガイド筒９が内側に変形し、第１回転筒８の回転キー溝８ａから回転キー９ｂが外れ、第１直進ガイド筒９が第１回転筒８から落ち込みレンズ鏡胴が破壊されるという不具合がある。
特開２００５−０１７４１８では、第１直進ガイド筒９の厚さを一部厚くすることにより第１直進ガイド筒の変形を防ぎ、衝撃等に対して強化している。しかし、この方式において各回転筒の外径を一定にするためには回転筒の肉厚を薄くする必要があり、回転筒の強度が損なわれるという問題がある。
特開２００５−０１７４１８公報 In the above configuration, when a load F is applied to the first lens holding cylinder 5 from the front in the optical axis direction in the direction of the arrow in the figure, the force is transmitted through the second rotating cylinder 6 and travels through the helicoid 9A in the first straight line. Join the guide tube 9. When a load such as an impact is strong, the first rectilinear guide tube 9 is deformed inward, the rotation key 9b is removed from the rotation key groove 8a of the first rotating tube 8, and the first rectilinear guide tube 9 is moved to the first rotating tube 8 There is a problem that the lens barrel falls down and is destroyed.
In Japanese Patent Application Laid-Open No. 2005-017418, the first rectilinear guide cylinder 9 is partially thickened to prevent the first rectilinear guide cylinder from being deformed and strengthened against impact and the like. However, in this method, in order to make the outer diameter of each rotating cylinder constant, it is necessary to reduce the thickness of the rotating cylinder, and there is a problem that the strength of the rotating cylinder is impaired.
Japanese Patent Laid-Open No. 2005-017418

本発明は上記に鑑みてなされたものであり、その目的は、回転筒の肉厚を薄くすることによる強度低下や、大型化を招くことなく、衝撃等、レンズ鏡胴に外部から加わる負荷に対する強度を高めることができるレンズ鏡胴、及び撮像装置を提供することである。   The present invention has been made in view of the above, and its purpose is to reduce the strength by reducing the thickness of the rotating cylinder and to increase the load applied to the lens barrel from the outside without causing an increase in size. It is an object to provide a lens barrel and an imaging apparatus capable of increasing the strength.

上記目的を達成するため、請求項１の発明に係るレンズ鏡胴は、撮像面に被写体像を結像させるレンズ群と、前記レンズ群の少なくとも一つを保持して光軸方向の所定位置に移動させるレンズ駆動装置と、前記レンズ駆動装置を保持する固定筒と、を有し、前記レンズ群のうちの少なくとも一部を収納する沈胴状態から前記レンズ群のうちの少なくとも一部を被写体側に移動することにより撮影状態とするレンズ鏡胴であって、前記レンズ駆動装置が、１つ以上の回転する回転筒と、前記回転筒に対して相対回転し且つ前記回転筒と一体に光軸方向に直進移動する１つ以上の直進ガイド筒と、を備え、前記直進ガイド筒は、前記回転筒と相対回転可能且つ一体的に光軸方向に移動するようにその外面に光軸方向と直交する面を有した１つ以上のキー部と、前記回転筒の内面に設けられて前記キー部と係合するキー溝と、を有し、前記直進ガイド筒は、該直進ガイド筒の撮像面側から外径方向へ突出した突出部の前面から光軸方向被写体側に突出したリブ部を有し、前記直進ガイド筒の外周面と前記リブ部とで、前記回転筒を光軸と直交する面で挟み込むことを特徴とする。 In order to achieve the above object, a lens barrel according to a first aspect of the present invention is a lens group for forming a subject image on an imaging surface, and holds at least one of the lens groups at a predetermined position in the optical axis direction. A lens driving device to be moved, and a fixed cylinder for holding the lens driving device, wherein at least a part of the lens group is moved from the retracted state in which at least a part of the lens group is accommodated to the subject side. A lens barrel that is brought into a photographing state by moving, wherein the lens driving device rotates relative to the one or more rotating cylinders and the rotating cylinder and is integrated with the rotating cylinder in the optical axis direction. One or more rectilinear guide cylinders that move in a straight line, and the rectilinear guide cylinders are relatively rotatable with the rotary cylinder and integrally move in the optical axis direction so that the outer surface thereof is orthogonal to the optical axis direction. One or more with faces Has a key portion, and a key groove that engages the key portion provided on an inner surface of the rotary cylinder, the straight guide tube is projected from the imaging surface side of the straight advancing guide tube radially outward projecting A rib portion protruding toward the subject side in the optical axis direction from the front surface of the first portion, and the rotating tube is sandwiched between a peripheral surface of the linear guide tube and the rib portion by a surface orthogonal to the optical axis .

請求項２の発明は、請求項１において、一つの前記キー部を前記直進ガイド筒の周方向両側から挟み込むように２つの前記リブ部を配置したことを特徴とする。
請求項３の発明は、請求項１、又は２において、前記回転筒はその外径部に外部からの回転力を受け回転するための駆動部を有し、前記リブ部の外径は前記駆動部の最内径より小さく設定されていることを特徴とする。
請求項４の発明は、請求項１、２、又は３において、前記直進ガイド筒には前記キー部が約１２０度の周方向間隔にて３箇所配置され、前記リブ部は６箇所配置されていることを特徴とする。
請求項５の発明に係る撮像装置は、請求項１乃至４の何れか一項に記載のレンズ鏡胴を備えたことを特徴とする。
The invention of claim 2 is characterized in that, in claim 1, the two rib portions are arranged so as to sandwich one key portion from both sides in the circumferential direction of the rectilinear guide tube .
According to a third aspect of the present invention, in the first or second aspect, the rotating cylinder has a driving portion for rotating by receiving a rotational force from the outside at an outer diameter portion thereof, and the outer diameter of the rib portion is the driving force. It is characterized by being set smaller than the innermost diameter of the part.
According to a fourth aspect of the present invention, in the first, second, or third aspect, the linear guide tube includes three key portions arranged at a circumferential interval of about 120 degrees and six rib portions. It is characterized by being.
An image pickup apparatus according to a fifth aspect of the invention includes the lens barrel according to any one of the first to fourth aspects.

即ち、本発明の鏡胴では、第１直進ガイド筒の第１キー部付近に第１回転筒を光軸方向と直交する２つの面で挟み込むように光軸方向に突出した２つのリブ部を設けたので、鏡胴繰出し時に鏡胴前面から衝撃等の強い力が掛かったとしてもリブ部により第１直進ガイド筒の変形を防止することができ、鏡胴の破壊を防止することができる。
また、本発明では、２つのリブ部は、第１回転筒の回転中心を中心に回転方向で第１キー部を挟みこむように２つのリブ部を配置したので、鏡胴の強度を高めると共に、第１キー部を樹脂材料により製造する際の型構造を簡単にすることができる。
また、本発明では、第１回転筒は外形部に外部からの回転力を受け回転するための駆動部としてのギヤ部を持ち、リブ部の外径はギヤ部の最内径より小さいので、鏡胴の径を維持したまま鏡胴の強化を図ることができる。
更に、第１の直進ガイド筒にはキー部が約１２０°おきに３箇所配置され、リブ部が６箇所配置されているため、鏡胴が受けた力を均等に各リブ部に分散させることによってレンズ鏡胴としての強度アップを図ることができる。
また、本願発明のレンズ鏡胴は、デジタルカメラ、ビデオカメラ、銀塩カメラ、その他ズーム式の鏡胴を備えた撮像装置一般に適用することにより、衝撃等の力に強い撮像装置を提供することができる。 That is, in the lens barrel of the present invention, the two rib portions projecting in the optical axis direction so as to sandwich the first rotating cylinder between the two surfaces perpendicular to the optical axis direction are disposed near the first key portion of the first rectilinear guide cylinder. Since it is provided, even when a strong force such as an impact is applied from the front of the lens barrel when the lens barrel is extended, the rib portion can prevent the first straight guide tube from being deformed, and the lens barrel can be prevented from being broken.
In the present invention, since the two rib portions are arranged so as to sandwich the first key portion in the rotation direction around the rotation center of the first rotating cylinder, the strength of the lens barrel is increased, The mold structure when the first key portion is manufactured from a resin material can be simplified.
In the present invention, the first rotating cylinder has a gear portion as a driving portion for rotating by receiving a rotational force from the outside in the outer portion, and the outer diameter of the rib portion is smaller than the innermost diameter of the gear portion. The lens barrel can be strengthened while maintaining the diameter of the barrel.
Furthermore, since the first straight guide tube has three key portions arranged at intervals of about 120 ° and six rib portions, the force received by the lens barrel is evenly distributed to each rib portion. As a result, the strength of the lens barrel can be increased.
Further, the lens barrel of the present invention can provide an imaging device that is strong against impact and the like by being applied to a digital camera, a video camera, a silver salt camera, and other imaging devices generally equipped with a zoom type lens barrel. it can.

以下、本発明を図面に示した実施の形態に基づき詳細に説明する。
図１（ａ）は本発明の一実施形態に係るレンズ鏡胴の縦断面図であり、上段が繰出し状態、下段が収納状態を示す。また、図１（ｂ）は（ａ）上段の要部拡大図である。図２は第１回転筒と第１直進ガイド筒の構成を示す分解斜視図であり、図３は第１回転筒と第１直進ガイド筒の組付け状態を示す側面図であり、図４は第１直進ガイド筒の正面図である。
本実施形態に係るレンズ鏡胴は、第１、第２、第３及び第４レンズ群１、２、３、４と、第１レンズ群１を保持する第１レンズ保持筒５と、第１レンズ保持筒５の外径側に配置された第２回転筒６と、第１レンズ保持筒５の内径側に位置する第２直進ガイド筒７と、第２回転筒６の外径側に配置された第１回転筒８と、第１回転筒８と第２回転筒６の間に配置された第１直進ガイド筒９と、第１回転筒８と第１直進ガイド筒９を内周面にて支持する固定筒１０と、撮像素子（ＣＤＤ）１１と、を概略備えている。 Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1A is a longitudinal sectional view of a lens barrel according to an embodiment of the present invention, in which the upper stage shows the extended state and the lower stage shows the stored state. Moreover, FIG.1 (b) is the principal part enlarged view of the upper stage of (a). 2 is an exploded perspective view showing the configuration of the first rotating cylinder and the first rectilinear guide cylinder, FIG. 3 is a side view showing the assembled state of the first rotating cylinder and the first rectilinear guide cylinder, and FIG. It is a front view of the 1st rectilinear advance guide cylinder.
The lens barrel according to the present embodiment includes first, second, third, and fourth lens groups 1, 2, 3, and 4, a first lens holding cylinder 5 that holds the first lens group 1, and a first lens barrel. A second rotating cylinder 6 disposed on the outer diameter side of the lens holding cylinder 5, a second rectilinear guide cylinder 7 positioned on the inner diameter side of the first lens holding cylinder 5, and an outer diameter side of the second rotating cylinder 6. The inner surface of the first rotating cylinder 8, the first rectilinear guide cylinder 9 disposed between the first rotating cylinder 8 and the second rotating cylinder 6, and the first rotating cylinder 8 and the first rectilinear guide cylinder 9 And a fixed cylinder 10 supported by the image pickup device (CDD) 11.

回転筒６、８と、各回転筒に対して相対回転し且つ各回転筒と一体に光軸方向に直進移動する１つ以上の直進ガイド筒７、９とは、レンズ駆動装置Ｄを構成している。
第１レンズ保持筒５はその外周部適所にレンズ駆動ピン５ａを備え、このレンズ駆動ピン５ａが第２回転筒６の内径に設けられている螺旋状のカム溝６ａと係合することにより、第２回転筒６に保持されている。従って、第２回転筒６が回転することにより、第１レンズ保持筒５は光軸方向へ直線移動することができる。第１レンズ保持筒５の内径には、第２直進ガイド筒７が相対的に直進移動できるように溝嵌合している。
第２直進ガイド筒７の後端外周面に突設したキー部７ａが第２回転筒６の内周面に設けた螺旋状のカム溝６ｂと嵌合することにより、第２の直進ガイド筒７と第２回転筒６とは相対回転し、且つ光軸方向へ一体的に移動する。つまり、光軸方向と直交する面で第２回転筒６のキー溝６ｂと第２直進ガイド筒７のキー部７ａとが係合している。 The rotating cylinders 6 and 8 and the one or more rectilinear guide cylinders 7 and 9 that rotate relative to the rotating cylinders and move linearly in the optical axis direction integrally with the rotating cylinders constitute a lens driving device D. ing.
The first lens holding cylinder 5 is provided with a lens driving pin 5a at an appropriate position on the outer periphery thereof, and this lens driving pin 5a is engaged with a spiral cam groove 6a provided on the inner diameter of the second rotating cylinder 6. It is held by the second rotating cylinder 6. Accordingly, when the second rotating cylinder 6 rotates, the first lens holding cylinder 5 can linearly move in the optical axis direction. A groove is fitted into the inner diameter of the first lens holding cylinder 5 so that the second rectilinear guide cylinder 7 can move relatively straight.
A key portion 7 a protruding from the outer peripheral surface of the rear end of the second rectilinear guide tube 7 is fitted with a spiral cam groove 6 b provided on the inner peripheral surface of the second rotating tube 6, whereby the second rectilinear guide tube 7 and the second rotating cylinder 6 rotate relative to each other and move integrally in the optical axis direction. That is, the key groove 6b of the second rotating cylinder 6 and the key portion 7a of the second rectilinear guide cylinder 7 are engaged with each other on a plane orthogonal to the optical axis direction.

第２回転筒６は第１直進ガイド筒９の内径に設けられたヘリコイド９Ａで嵌合しており、第２直進ガイド筒７が第１直進ガイド筒９と光軸方向で直進移動できるように、第２直進ガイド筒７の直進キー部７ｂと第１直進ガイド筒９の内径に設けられている直進ガイド溝９ａとが嵌合している。
第１回転筒８は第２回転筒６と一体的に回転できるように図示しない係合ピンで係合され、第１回転筒８と第１直進ガイド筒９とは光軸方向に一体的に移動し且つ相対回転可能となるように、第１回転筒８の螺旋状の第１キー溝８ａの光軸方向と直交する内壁面と第１直進ガイド筒の第１キー部９ｂとが係合している。これにより、第１回転筒８が回転することで第２回転筒６は第１直進ガイド筒９の内径に設けられたヘリコイド９Ａに沿って回転しながら進退し、第２直進ガイド筒７は光軸方向に直進する。 The second rotating cylinder 6 is fitted with a helicoid 9A provided on the inner diameter of the first rectilinear guide cylinder 9, so that the second rectilinear guide cylinder 7 can move linearly with the first rectilinear guide cylinder 9 in the optical axis direction. The rectilinear key portion 7b of the second rectilinear guide cylinder 7 and the rectilinear guide groove 9a provided on the inner diameter of the first rectilinear guide cylinder 9 are fitted.
The first rotating cylinder 8 is engaged with an engaging pin (not shown) so as to be able to rotate integrally with the second rotating cylinder 6, and the first rotating cylinder 8 and the first rectilinear guide cylinder 9 are integrally formed in the optical axis direction. The inner wall surface perpendicular to the optical axis direction of the spiral first keyway 8a of the first rotating cylinder 8 and the first key portion 9b of the first rectilinear guide cylinder are engaged so that they can move and rotate relative to each other. is doing. As a result, when the first rotating cylinder 8 rotates, the second rotating cylinder 6 advances and retreats while rotating along the helicoid 9A provided on the inner diameter of the first rectilinear guide cylinder 9, and the second rectilinear guide cylinder 7 Go straight in the axial direction.

第１回転筒８はＣＣＤ１１を保持している固定筒１０の内径とヘリコイド嵌合し、第１直進ガイド筒９は固定筒１０の内径に光軸方向に設けられた直進ガイド溝１０ａと係合している。固定筒１０には、第１回転筒８を駆動するモータ及び複数のギヤが備えられ、第１回転筒８と係合している。これによりモータから受けた回転力がギヤを介して第１回転筒８を回転し、第１直進ガイド筒９、第２回転筒６、第２直進ガイド筒７を介して第１レンズ保持筒５を光軸方向に進退させる。
次に、図２、図３及び図４に示すように、第１直進ガイド筒９の外周面にほぼ１２０°間隔で設けられている第１キー部９ｂ付近に、第１回転筒８の端部を光軸方向と直交する面で挟み込むように光軸方向に突出した２個のリブ部９ｃを夫々３箇所、合計６箇所設けている。つまり、リブ９ｃは第１キー部９ｂよりも後方の外周面から外径方向へ突出した突起９ｄの前面適所から光軸方向前方へ突出した突起であり、第１回転筒８の後端縁の上面を押さえ込むように配置されている。図４のように円周方向両側から第１キー部９ｂを挟み込むように２個のリブ部９ｃを設けることで、樹脂成形に際しての金型構造を単純化することができる。 The first rotating cylinder 8 is helicoid-fitted with the inner diameter of the fixed cylinder 10 holding the CCD 11, and the first rectilinear guide cylinder 9 is engaged with the rectilinear guide groove 10 a provided in the optical axis direction on the inner diameter of the fixed cylinder 10. is doing. The fixed cylinder 10 includes a motor that drives the first rotating cylinder 8 and a plurality of gears, and is engaged with the first rotating cylinder 8. Thereby, the rotational force received from the motor rotates the first rotating cylinder 8 via the gear, and the first lens holding cylinder 5 via the first rectilinear guide cylinder 9, the second rotating cylinder 6 and the second rectilinear guide cylinder 7. Is moved forward and backward in the optical axis direction.
Next, as shown in FIGS. 2, 3, and 4, the end of the first rotary cylinder 8 is positioned near the first key portion 9 b provided at an interval of approximately 120 ° on the outer peripheral surface of the first straight guide cylinder 9. Two rib portions 9c projecting in the optical axis direction so as to sandwich the portion between the surfaces orthogonal to the optical axis direction are provided at a total of six locations. That is, the rib 9c is a protrusion that protrudes forward in the optical axis direction from an appropriate position on the front surface of the protrusion 9d that protrudes from the outer peripheral surface behind the first key portion 9b in the outer diameter direction. It is arranged to hold down the top surface. As shown in FIG. 4, by providing the two rib portions 9c so as to sandwich the first key portion 9b from both sides in the circumferential direction, the mold structure at the time of resin molding can be simplified.

以上の構成において、第１レンズ保持筒５の光軸前方から衝撃等の強い力を受けた場合、この応力はレンズ駆動ピン５ａを伝わって外径側に配置された第２回転筒６に加わる。第２回転筒６に伝わった衝撃力はヘリコイド９Ａを介して第１直進ガイド筒９に伝わる。第１直進ガイド筒９はこの衝撃力により後方へ移動しようとするが、第１回転筒８の第１キー溝８ａが第１キー部９ｂと係合しているため軸方向へは動かない。しかし、大きな衝撃力が掛かった場合、第１直進ガイド筒９は内径側に変形を始め、第１キー部９ｂが第１キー溝８ａとの係合を解除しようとする。このとき第１リブ部９ｃの内径と第１回転筒８の外周面とが干渉し、第１直進ガイド筒９の内径側への変形を抑える。この状態では、第１直進ガイド筒９単体の強度だけではなく、第１回転筒８の強度が加わるため、第１直進ガイド筒９の肉厚を増やしたときと同じ補強効果が発揮され、第１直進ガイド筒９の内径側への変形を防止するための強度がかなり強いものとなり、レンズ鏡胴全体としての光軸方向からの衝撃に対する強度が増大する結果をもたらす。   In the above configuration, when a strong force such as an impact is received from the front of the optical axis of the first lens holding cylinder 5, the stress is transmitted to the second rotating cylinder 6 disposed on the outer diameter side through the lens driving pin 5a. . The impact force transmitted to the second rotating cylinder 6 is transmitted to the first rectilinear guide cylinder 9 via the helicoid 9A. The first rectilinear guide tube 9 tries to move backward by this impact force, but does not move in the axial direction because the first key groove 8a of the first rotating tube 8 is engaged with the first key portion 9b. However, when a large impact force is applied, the first rectilinear guide tube 9 starts to deform toward the inner diameter side, and the first key portion 9b attempts to release the engagement with the first key groove 8a. At this time, the inner diameter of the first rib portion 9c interferes with the outer peripheral surface of the first rotating cylinder 8, and the deformation of the first rectilinear guide cylinder 9 toward the inner diameter side is suppressed. In this state, not only the strength of the first rectilinear guide tube 9 alone but also the strength of the first rotating tube 8 is added, so that the same reinforcing effect as when the thickness of the first rectilinear guide tube 9 is increased is exhibited. The strength for preventing deformation of the one-straight guide tube 9 toward the inner diameter side is considerably strong, resulting in an increase in strength against impact from the optical axis direction as the entire lens barrel.

また、第１リブ部９ｃの外径を第１回転筒８の外周に設けたギヤ部（外部からの回転力を受けて回転するための駆動部）８ｂ及びヘリコイド部の最小径（谷部）より小さくすることで第１回転筒８は干渉せずに回転することができ、第１回転筒８の肉厚を薄くする必要がなく、また大きくする必要もない。
また、第１直進ガイド筒９の外周面に設けた第１キー部９ｂをほぼ１２０°ごとに設けることで、第１リブ部９ｃに掛かる力を均等に分散し、個々の第１リブ部が変形を抑える力を小さくすることができ、鏡胴として耐えうる力を上げることができる。
以上のように本発明によれば、小型でありながら、衝撃等レンズ鏡胴への負荷に対して強化することのできるレンズ鏡胴を提供することができる。
即ち、本発明のレンズ鏡胴では、第１直進ガイド筒９の第１キー部９ｂ付近に第１回転筒８の後端部を光軸方向と直交する２つの面で挟み込むように光軸方向に突出した２つのリブ部９ｃを設けたので、鏡胴繰出し時に鏡胴前面から衝撃等の強い力が掛かったとしてもリブ部により第１直進ガイド筒の変形を防止することができ、鏡胴の破壊を防止することができる。 The outer diameter of the first rib portion 9c is a gear portion (driving portion for rotating by receiving external rotational force) 8b provided on the outer periphery of the first rotating cylinder 8 and the minimum diameter (valley portion) of the helicoid portion. By making it smaller, the first rotating cylinder 8 can rotate without interference, and it is not necessary to reduce the thickness of the first rotating cylinder 8 and to increase it.
Further, by providing the first key portion 9b provided on the outer peripheral surface of the first rectilinear guide tube 9 approximately every 120 °, the force applied to the first rib portion 9c is evenly distributed, and each first rib portion is The force that suppresses deformation can be reduced, and the force that can be endured as a lens barrel can be increased.
As described above, according to the present invention, it is possible to provide a lens barrel that can be strengthened against a load on the lens barrel such as an impact while being small.
That is, in the lens barrel of the present invention, the optical axis direction is such that the rear end portion of the first rotating cylinder 8 is sandwiched between two surfaces orthogonal to the optical axis direction in the vicinity of the first key portion 9b of the first rectilinear guide cylinder 9. Since the two rib portions 9c projecting from the lens barrel are provided, even if a strong force such as an impact is applied from the front surface of the lens barrel when the lens barrel is extended, the rib portion can prevent the first straight guide tube from being deformed. Can be prevented.

また、本発明では、２つのリブ部９ｃは、第１回転筒８の回転中心を中心に回転方向で第１キー部９ｂを挟みこむように２つ配置したので、鏡胴の強度を高めると共に、第１キー部を樹脂材料により製造する際の金型構造を簡単にすることができる。
また、本発明では、第１回転筒８は外形部に外部からの回転力を受け回転するための駆動部としてのギヤ部８ｂを持ち、リブ部９ｃの外径はギヤ部８ｂの最内径より小さいので、鏡胴の径を維持したまま鏡胴の強化を図ることができる。
更に、第１の直進ガイド筒９にはキー部９ｂが約１２０°おきに３箇所配置され、リブ部９ｃが６箇所配置されているため、鏡胴が受けた力を均等に各リブ部に分散させることによってレンズ鏡胴としての強度アップを図ることができる。
また、本願発明のレンズ鏡胴は、デジタルカメラ、ビデオカメラ、銀塩カメラ、その他ズーム式の鏡胴を備えた撮像装置一般に適用することにより、衝撃等の力に強い撮像装置を提供することができる。 In the present invention, since the two rib portions 9c are arranged so as to sandwich the first key portion 9b in the rotation direction around the rotation center of the first rotating cylinder 8, the strength of the lens barrel is increased. It is possible to simplify the mold structure when the first key portion is manufactured from a resin material.
In the present invention, the first rotating cylinder 8 has a gear portion 8b as a driving portion for rotating by receiving a rotational force from the outside in the outer portion, and the outer diameter of the rib portion 9c is larger than the innermost diameter of the gear portion 8b. Since it is small, it is possible to strengthen the lens barrel while maintaining the diameter of the lens barrel.
Further, since the first straight guide tube 9 has three key portions 9b arranged at intervals of about 120 ° and six rib portions 9c, the force received by the lens barrel is equally applied to each rib portion. By dispersing, the strength of the lens barrel can be increased.
Further, the lens barrel of the present invention can provide an imaging device that is strong against impact and the like by being applied to a digital camera, a video camera, a silver salt camera, and other imaging devices generally equipped with a zoom type lens barrel. it can.

（ａ）は本発明の一実施形態に係るレンズ鏡胴の縦断面図であり、（ｂ）は（ａ）上段の要部拡大図である。(A) is a longitudinal cross-sectional view of the lens barrel which concerns on one Embodiment of this invention, (b) is the principal part enlarged view of (a) upper stage. 第１回転筒と第１直進ガイド筒の構成を示す分解斜視図である。It is a disassembled perspective view which shows the structure of a 1st rotation cylinder and a 1st rectilinear guide cylinder. 第１回転筒と第１直進ガイド筒の組付け状態を示す側面図である。It is a side view which shows the assembly | attachment state of a 1st rotation cylinder and a 1st rectilinear guide cylinder. 第１直進ガイドの正面図である。It is a front view of the 1st straight advance guide. 従来例に係るレンズ鏡胴の縦断面図である。It is a longitudinal cross-sectional view of the lens barrel which concerns on a prior art example.

符号の説明Explanation of symbols

１、２、３、４…レンズ群、１０…固定筒、１０ａ…直進ガイド溝、１１…ＣＣＤ、５…レンズ保持筒、５ａ…レンズ駆動ピン、６…回転筒、６ａ…カム溝、６ｂ…カム溝、６ｂ…キー溝、７…直進ガイド筒、７ａ…キー部、７ｂ…直進キー部、８…回転筒、８ａ…回転キー溝、８ｂ…ギヤ部、９…直進ガイド筒、９Ａ…ヘリコイド、９ａ…直進ガイド溝、９ｂ…回転キー部、９ｃ…リブ部、９ｄ…突起   1, 2, 3, 4 ... lens group, 10 ... fixed tube, 10a ... straight guide groove, 11 ... CCD, 5 ... lens holding tube, 5a ... lens drive pin, 6 ... rotating tube, 6a ... cam groove, 6b ... Cam groove, 6b ... Key groove, 7 ... Linear guide tube, 7a ... Key portion, 7b ... Linear key portion, 8 ... Rotary tube, 8a ... Rotation key groove, 8b ... Gear portion, 9 ... Linear guide tube, 9A ... Helicoid , 9a ... Straight running guide groove, 9b ... Rotating key part, 9c ... Rib part, 9d ... Projection

Claims (5)

撮像面に被写体像を結像させるレンズ群と、前記レンズ群の少なくとも一つを保持して光軸方向の所定位置に移動させるレンズ駆動装置と、前記レンズ駆動装置を保持する固定筒と、を有し、前記レンズ群のうちの少なくとも一部を収納する沈胴状態から前記レンズ群のうちの少なくとも一部を被写体側に移動することにより撮影状態とするレンズ鏡胴であって、
前記レンズ駆動装置が、１つ以上の回転する回転筒と、前記回転筒に対して相対回転し且つ前記回転筒と一体に光軸方向に直進移動する１つ以上の直進ガイド筒と、を備え、
前記直進ガイド筒は、前記回転筒と相対回転可能且つ一体的に光軸方向に移動するようにその外面に光軸方向と直交する面を有した１つ以上のキー部と、前記回転筒の内面に設けられて前記キー部と係合するキー溝と、を有し、
前記直進ガイド筒は、該直進ガイド筒の撮像面側から外径方向へ突出した突出部の前面から光軸方向被写体側に突出したリブ部を有し、
前記直進ガイド筒の外周面と前記リブ部とで、前記回転筒を光軸と直交する面で挟み込むことを特徴とするレンズ鏡胴。 A lens group that forms a subject image on an imaging surface; a lens driving device that holds at least one of the lens groups and moves the lens group to a predetermined position in the optical axis direction; and a fixed cylinder that holds the lens driving device. A lens barrel that is in a shooting state by moving at least a part of the lens group to the subject side from a retracted state that houses at least a part of the lens group,
The lens driving device includes one or more rotating rotating cylinders and one or more rectilinear guide cylinders that rotate relative to the rotating cylinder and move linearly in the optical axis direction integrally with the rotating cylinder. ,
The rectilinear guide cylinder includes at least one key portion having a surface orthogonal to the optical axis direction on an outer surface thereof so as to be rotatable relative to the rotary cylinder and integrally move in the optical axis direction; A key groove provided on the inner surface and engaged with the key portion,
The rectilinear guide tube has a rib portion projecting from the front surface of the projecting portion projecting in the outer diameter direction from the imaging surface side of the rectilinear guide tube to the subject side in the optical axis direction ,
A lens barrel characterized in that the rotating cylinder is sandwiched by a surface orthogonal to the optical axis between the outer peripheral surface of the linear guide cylinder and the rib portion . 一つの前記キー部を前記直進ガイド筒の周方向両側から挟み込むように２つの前記リブ部を配置したことを特徴とする請求項１記載のレンズ鏡胴。 The lens barrel according to claim 1, wherein the two rib portions are arranged so as to sandwich one key portion from both sides in the circumferential direction of the rectilinear guide tube . 前記回転筒はその外径部に外部からの回転力を受け回転するための駆動部を有し、前記リブ部の外径は前記駆動部の最内径より小さく設定されていることを特徴とする請求項１、又は２に記載のレンズ鏡胴。   The rotating cylinder has a driving part for rotating by receiving an external rotational force at an outer diameter part thereof, and an outer diameter of the rib part is set smaller than an innermost diameter of the driving part. The lens barrel according to claim 1 or 2. 前記直進ガイド筒には前記キー部が約１２０度の周方向間隔にて３箇所配置され、前記リブ部は６箇所配置されていることを特徴とする請求項１、２、又は３に記載のレンズ鏡胴。   4. The linear guide cylinder according to claim 1, 2, or 3, wherein the key portions are arranged at three locations at a circumferential interval of about 120 degrees, and the rib portions are arranged at six locations. Lens barrel. 請求項１乃至４の何れか一項に記載のレンズ鏡胴を備えたことを特徴とする撮像装置。   An imaging apparatus comprising the lens barrel according to any one of claims 1 to 4.
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