JP5791380B2 - Lens barrel and imaging device - Google Patents

Lens barrel and imaging device Download PDF

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JP5791380B2
JP5791380B2 JP2011129551A JP2011129551A JP5791380B2 JP 5791380 B2 JP5791380 B2 JP 5791380B2 JP 2011129551 A JP2011129551 A JP 2011129551A JP 2011129551 A JP2011129551 A JP 2011129551A JP 5791380 B2 JP5791380 B2 JP 5791380B2
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lens barrel
optical axis
axis direction
barrel
cylindrical body
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JP2012255947A (en
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伸嘉 鈴木
伸嘉 鈴木
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Canon Inc
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Description

本発明はレンズ鏡筒およびこれを用いたデジタルカメラやビデオカメラ等の撮像装置に関するものである。   The present invention relates to a lens barrel and an imaging apparatus such as a digital camera or a video camera using the lens barrel.

複数の筒体を移動させることにより撮影可能なレンズ鏡筒において、筒体同士には通常、若干の間隙が設けられている。この間隙から不要な光が進入した場合、ゴーストなどの光学性能に影響を及ぼすおそれがある。
上記間隙からの外光が進入しないように防止するため、特許文献１では、隣接する２つの筒体のうち、内側の筒体後端には外径方向に突出する鍔部を設け、外側の筒体先端には内径方向に突出する鍔部を設けている。それぞれの鍔部が光軸方向から見たときに重なり合うことで、レンズ鏡筒内への光線の進入が防止される。また、特許文献２に開示された構成では、筒体同士の嵌合部近傍の空間に遮光シートを設けて光線の進入を防止している。 In a lens barrel that can be photographed by moving a plurality of cylinders, a slight gap is usually provided between the cylinders. If unnecessary light enters from this gap, there is a risk of affecting optical performance such as ghost.
In order to prevent external light from entering the gap, in Patent Literature 1, a flange that protrudes in the outer diameter direction is provided at the rear end of the inner cylinder of two adjacent cylinders. A flange portion protruding in the inner diameter direction is provided at the tip of the cylindrical body. The overlapping of the flanges when viewed from the optical axis direction prevents the light from entering the lens barrel. Moreover, in the structure disclosed by patent document 2, the light-shielding sheet is provided in the space near the fitting part of cylinders, and the entrance of a light beam is prevented.

特許第４２８０７７９号公報Japanese Patent No. 42807779 特開２００７−１８３６８５号公報Japanese Patent Laid-Open No. 2007-183685

前記特許文献１に開示された技術では、一方の筒体の鍔部にて、他の部材との干渉を回避するための切り欠き部などが設けられた場合、該切り欠き部から不要な光線が進入して光学性能に影響を及ぼすおそれがある。また、前記特許文献２に開示された技術では、遮光シートを新たに設ける必要があるため、部品点数が増加し、コスト上昇につながる。
そこで本発明の目的は、筒体同士の間隙から進入する外光を遮光する構造において、一方の筒体に切り欠き部が設けられた場合でも、部品点数の増加を伴わずに遮光対策が可能なレンズ鏡筒および撮像装置を提供することである。 In the technique disclosed in Patent Document 1, when a notch or the like for avoiding interference with another member is provided in the collar portion of one cylindrical body, unnecessary light rays are emitted from the notch. May affect the optical performance. Moreover, in the technique disclosed in Patent Document 2, since it is necessary to newly provide a light shielding sheet, the number of parts increases, leading to an increase in cost.
Accordingly, an object of the present invention is to provide a light shielding measure without increasing the number of parts even in the case where a cutout portion is provided in one cylindrical body in a structure that blocks external light entering from the gap between the cylindrical bodies. A lens barrel and an imaging device.

上記課題を解決するために本発明に係る装置は、第１の筒体と、前記第１の筒体が内側に配置される第２の筒体と、前記第１および第２の筒体を光軸方向に沿って相対的に移動させる機構部を備えたレンズ鏡筒であって、前記第１の筒体には、前記第１の筒体の外径方向に突出する帯部が前記光軸方向にて結像面側の端部外周面に形成されており、前記帯部は、前記光軸方向に沿って被写体側に突出する凸部を有し、前記第２の筒体には、内径が前記帯部の外径よりも小さい鍔部が前記光軸方向にて被写体側の端部に形成されており、前記鍔部は、前記光軸方向に一部が切り欠かれる第１の切り欠き部を有し、前記第１の筒体と前記第２の筒体が第１の位置関係にある場合、前記光軸方向から見て光軸回り方向における前記凸部と前記第１の切り欠き部の位相角が一致していることを特徴とする。
The apparatus according to the present invention in order to solve the above problems, a first cylindrical body, and a second cylindrical body of the first tubular member is positioned inside, the first and second cylindrical body A lens barrel having a mechanism that moves relatively along the optical axis direction, wherein the first cylindrical body includes a band portion that projects in an outer diameter direction of the first cylindrical body. is formed on the end outer peripheral surface of the image plane side in the axial direction, the strip portion has a protrusion protruding toward the subject side along the optical axis direction, the second cylindrical body Has a flange portion whose inner diameter is smaller than the outer diameter of the belt portion at the object side end portion in the optical axis direction, and the flange portion is partially cut away in the optical axis direction. 1 notch has, when said second tubular member and the first cylindrical body is in a first positional relationship, the said protrusion when viewed from the optical axis direction of the optical axis direction first 1 of Ri phase angle away portion is equal to or match.

本発明によれば、前記第２の筒体に切り欠き部が設けられた場合でも、部品点数の増加を伴わずに遮光対策を講じることができる。   According to the present invention, even when a cutout portion is provided in the second cylindrical body, it is possible to take a light shielding measure without increasing the number of parts.

図２乃至９と併せて本発明の第１実施形態を説明するために、レンズ鏡筒の沈胴時の状態を示す断面図である。FIG. 10 is a cross-sectional view illustrating a state when the lens barrel is retracted in order to explain the first embodiment of the present invention in conjunction with FIGS. レンズ鏡筒の撮影時ＷＩＤＥ状態を示す断面図（Ａ）、およびＡ部の拡大図（Ｂ）である。It is sectional drawing (A) which shows the WIDE state at the time of imaging | photography of a lens-barrel, and the enlarged view (B) of A part. レンズ鏡筒の撮影時ＴＥＬＥ状態を示す断面図（Ａ）、およびＢ部の拡大図（Ｂ）である。It is sectional drawing (A) which shows the TELE state at the time of imaging | photography of a lens-barrel, and the enlarged view (B) of the B section. レンズ鏡筒の分解斜視図である。It is a disassembled perspective view of a lens barrel. カム筒およびキャップを示す分解斜視図である。It is a disassembled perspective view which shows a cam cylinder and a cap. １群鏡筒の斜視図である。It is a perspective view of a first group barrel. １群鏡筒の側面図（Ａ）およびＥ部の拡大図（Ｂ）である。It is the side view (A) of a 1st group barrel, and the enlarged view (B) of the E section. カム筒の正面図（Ａ）および内径展開図（Ｂ）である。It is the front view (A) and inner diameter expansion view (B) of a cam cylinder. レンズ鏡筒の撮影時ＷＩＤＥ状態を示す、図２（Ａ）とは異なる切断面での断面図（Ａ）、およびＣ部の拡大図（Ｂ）である。It is sectional drawing (A) in the cut surface different from FIG. 2 (A) which shows the WIDE state at the time of imaging | photography of a lens barrel, and the enlarged view (B) of the C section. 図１１とともに本発明の第２実施形態を説明するために、レンズ鏡筒のカム筒を示す正面図（Ａ）および背面斜視図（Ｂ）である。FIG. 11 is a front view (A) and a rear perspective view (B) showing a cam barrel of a lens barrel for explaining a second embodiment of the present invention together with FIG. 11. レンズ鏡筒の撮影時ＴＥＬＥ状態を示す断面図（Ａ）、およびＤ部の拡大図（Ｂ）である。It is sectional drawing (A) which shows the TELE state at the time of imaging | photography of a lens barrel, and the enlarged view (B) of the D section.

以下に、本発明の各実施形態を添付図面に基づいて詳細に説明する。
［第１実施形態］
図１は本発明の第１実施形態に係るレンズ鏡筒を備えた撮像装置の沈胴時の断面図である。図にはレンズ鏡筒と、複数の筒体を光軸方向に沿って相対的に移動させる機構部を示し、装置本体部の図示は省略する。
図２（Ａ）はレンズ鏡筒が広角端位置にある撮影時ＷＩＤＥ状態の断面図であり、図２（Ｂ）は図２（Ａ）に示すＡ部の拡大図である。また、図３（Ａ）はレンズ鏡筒が望遠端位置にある撮影時ＴＥＬＥ状態の断面図であり、図３（Ｂ）は図３（Ａ）に示すＢ部の拡大図である。 Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 is a cross-sectional view of the image pickup apparatus including the lens barrel according to the first embodiment of the present invention when the lens barrel is retracted. In the figure, a lens barrel and a mechanism part for relatively moving a plurality of cylinders along the optical axis direction are shown, and illustration of the apparatus main body is omitted.
FIG. 2A is a cross-sectional view in the WIDE state at the time of photographing in which the lens barrel is at the wide-angle end position, and FIG. 2B is an enlarged view of a portion A shown in FIG. FIG. 3A is a cross-sectional view in the TELE state at the time of photographing when the lens barrel is at the telephoto end position, and FIG. 3B is an enlarged view of a portion B shown in FIG.

先ず、図１乃至３を参照して、本発明の第１実施形態に係るレンズ鏡筒の構成の概要を説明する。なお、以下では光軸方向にて被写体側を前方とし、結像面側を後方と定義する。また撮像光学系の光軸に近づく方向を内側および内径方向とし、光軸と直交する鉛直方向を上下方向と定義して各部の位置関係を説明する。
レンズ鏡筒１００は、前方から順に１群レンズＬ１、２群レンズＬ２、３群レンズＬ３から構成される３群レンズ光学系を備える。
１群鏡筒１は１群レンズＬ１を保持し、２群保持枠２は２群レンズＬ２を保持し、３群保持枠３は３群レンズＬ３を保持する。絞り装置４は１群レンズＬ１と２群レンズＬ２の間に設けられている。３群レンズＬ３の後方には光学フィルタＦと撮像素子Ｓが配置されている。図２（Ａ）に示す撮影時ＷＩＤＥ状態では、２群レンズＬ２が１群レンズＬ１よりも３群レンズＬ３に近い位置にある。また図３（Ａ）に示す撮影時ＴＥＬＥ状態では、２群レンズＬ２が１群レンズＬ１に近い位置にある。各レンズ群を通して結像する被写体からの光は光学フィルタＦを通って撮像素子Ｓの受光面に到達し、被写体像が光電変換によって電気信号に変換される。 First, an outline of the configuration of the lens barrel according to the first embodiment of the present invention will be described with reference to FIGS. In the following, the subject side in the optical axis direction is defined as the front, and the imaging plane side is defined as the rear. Further, the positional relationship between the respective parts will be described by defining the direction approaching the optical axis of the imaging optical system as the inner side and the inner diameter direction, and defining the vertical direction perpendicular to the optical axis as the vertical direction.
The lens barrel 100 includes a third group lens optical system including a first group lens L1, a second group lens L2, and a third group lens L3 in order from the front.
The first group barrel 1 holds the first group lens L1, the second group holding frame 2 holds the second group lens L2, and the third group holding frame 3 holds the third group lens L3. The diaphragm device 4 is provided between the first group lens L1 and the second group lens L2. An optical filter F and an image sensor S are disposed behind the third group lens L3. In the shooting WIDE state shown in FIG. 2A, the second group lens L2 is closer to the third group lens L3 than the first group lens L1. In the photographing TELE state shown in FIG. 3A, the second group lens L2 is in a position close to the first group lens L1. Light from the subject that forms an image through each lens group passes through the optical filter F and reaches the light receiving surface of the image sensor S, and the subject image is converted into an electrical signal by photoelectric conversion.

次に、図４乃至９を参照しながら構成の詳細を説明する。
図４はレンズ鏡筒１００の構成例を示す分解斜視図である。図４には、カバー筒９、駆動筒８、固定筒７と、カム筒５、１群鏡筒１、直進筒６と、絞り装置４、２群保持枠２、３群保持枠３および地板１０を示す。
１群鏡筒１には、その後端部の外周面に配置された３個のカムピン１ａが形成されており、カム筒５の内周面に形成されたカム溝５ａに係合する。また、１群鏡筒１には内周面の３箇所に直進溝１ｂ（不図示）が形成されており、直進筒６の外周面に形成した直進キー６ａに係合する。２群保持枠２の外周面には、３個のカムピン２ａが設けられており、カム筒５の内周面に形成したカム溝５ｂに係合する。また、２群保持枠２にはカムピン２ａと同箇所に直進キー２ｂが形成されており、直進筒６の直進溝６ｂに係合する。 Next, details of the configuration will be described with reference to FIGS.
FIG. 4 is an exploded perspective view illustrating a configuration example of the lens barrel 100. FIG. 4 shows a cover cylinder 9, a drive cylinder 8, a fixed cylinder 7, a cam cylinder 5, a first group barrel 1, a rectilinear cylinder 6, an aperture device 4, a second group holding frame 2, a third group holding frame 3 and a main plate. 10 is shown.
The first group barrel 1 is formed with three cam pins 1 a disposed on the outer peripheral surface of the rear end thereof, and engages with a cam groove 5 a formed on the inner peripheral surface of the cam barrel 5. Further, the first group barrel 1 is formed with rectilinear grooves 1b (not shown) at three locations on the inner peripheral surface, and engages with a rectilinear key 6a formed on the outer peripheral surface of the rectilinear barrel 6. Three cam pins 2 a are provided on the outer peripheral surface of the second group holding frame 2 and engage with cam grooves 5 b formed on the inner peripheral surface of the cam cylinder 5. Further, the second group holding frame 2 is formed with a rectilinear key 2b at the same location as the cam pin 2a, and engages with the rectilinear groove 6b of the rectilinear cylinder 6.

絞り装置４は、外周面に配置された３個のカムピン４ａを備え、これらはカム筒５の内周面に形成したカム溝５ｃに係合する。また、絞り装置４にはカムピン４ａと同箇所に直進キー４ｂが形成されており、直進筒６に形成した直進溝６ｃに係合する。
カム筒５には、その後端部の内周面に溝部（不図示）が形成されており、この溝部は直進筒６の後端部の外周面に形成した３個の突部６ｄにそれぞれ係合する。カム筒５は直進筒６に回転可能に支持され、直進筒６と一体で移動する。また、カム筒５の後端部の外周面には３個のカムピン５ｅが設けられており、固定筒７の内周面に形成されたカム溝７ａに係合する。カム筒５の後端部の外周面に配置された３個の駆動ピン５ｆは、固定筒７に形成された貫通溝７ｂを貫通してから、駆動筒８の内周面に形成した直進溝８ａにそれぞれ係合する。直進筒６は１群鏡筒１、２群保持枠２、絞り装置４を回転不能に支持する。直進筒６の後端部の外周面には、３個の直進キー６ｅ、６ｆがそれぞれ設けられており、固定筒７の内周面に形成された直進溝７ｃ、７ｄにそれぞれ係合する。 The aperture device 4 includes three cam pins 4 a arranged on the outer peripheral surface, and these engage with a cam groove 5 c formed on the inner peripheral surface of the cam cylinder 5. Further, the diaphragm device 4 is formed with a rectilinear key 4b at the same position as the cam pin 4a, and engages with a rectilinear groove 6c formed in the rectilinear cylinder 6.
A groove (not shown) is formed on the inner peripheral surface of the rear end of the cam cylinder 5, and this groove is associated with three protrusions 6 d formed on the outer peripheral surface of the rear end of the rectilinear cylinder 6. Match. The cam cylinder 5 is rotatably supported by the rectilinear cylinder 6 and moves integrally with the rectilinear cylinder 6. Further, three cam pins 5 e are provided on the outer peripheral surface of the rear end portion of the cam cylinder 5 and engage with a cam groove 7 a formed on the inner peripheral surface of the fixed cylinder 7. The three drive pins 5 f arranged on the outer peripheral surface of the rear end portion of the cam cylinder 5 pass through the through groove 7 b formed in the fixed cylinder 7, and then are rectilinear grooves formed on the inner peripheral surface of the drive cylinder 8. 8a is engaged. The rectilinear cylinder 6 supports the first group barrel 1, the second group holding frame 2, and the diaphragm device 4 so as not to rotate. Three rectilinear keys 6e and 6f are provided on the outer peripheral surface of the rear end portion of the rectilinear cylinder 6, and engage with rectilinear grooves 7c and 7d formed on the inner peripheral surface of the fixed cylinder 7, respectively.

駆動筒８は、その後端部の外周面にギア部８ｂが形成されており、駆動装置１６に連結されて回転される。地板１０に取り付けられた駆動装置１６は、ＤＣ（直流）モータ１４と、複数のギア部品（不図示）を含む動力伝達部を用いて構成される。
駆動装置１６の出力が駆動筒８のギア部８ｂに伝達されて駆動筒８が回転すると、カム筒５は回転しながら光軸方向に沿って移動する。これは、カム筒５の駆動ピン５ｆと駆動筒８の直進溝８ａとの作用、およびカム筒５のカムピン５ｅと固定筒７のカム溝７ａとの作用による。また、１群鏡筒１は、１群鏡筒１のカムピン１ａとカム筒５のカム溝５ａとの作用、および１群鏡筒１の直進溝１ｂと直進筒６の直進キー６ａとの作用により、回転することなく光軸方向に沿って移動する。２群保持枠２は、２群保持枠２のカムピン２ａとカム筒５のカム溝５ｂとの作用、および２群保持枠２の直進キー２ｂと直進筒６の直進溝６ｂとの作用により、回転することなく光軸方向に移動する。絞り装置４は、そのカムピン４ａとカム筒５のカム溝５ｃとの作用、および絞り装置４の直進キー４ｂと直進筒６の直進溝６ｃとの作用により、回転することなく光軸方向に移動する。
３群保持枠３には、位置決め部３ａと振れ止め部（不図示）が形成されており、地板１０に配置したガイドバー１０ａ、１１に係合した状態で光軸方向に沿って移動可能に支持されている。また、３群保持枠３にはナット（不図示）が設けられており、ステッピングモータ１３のリードスクリュウ（送りねじ部）に螺合している。ステッピングモータ１３の出力によりリードスクリュウに螺合したナットが駆動されると、３群保持枠３は、位置決め部３ａ、振れ止め部３ｂとガイドバー１０ａ、１１との作用により、回転することなく光軸方向に沿って移動する。地板１０は撮像素子Ｓと光学フィルタＦを保持しており、ねじ締結によって固定筒７、カバー筒９と固定される。 The drive cylinder 8 has a gear portion 8b formed on the outer peripheral surface of the rear end portion thereof, and is connected to the drive device 16 and rotated. The drive device 16 attached to the main plate 10 is configured using a DC (direct current) motor 14 and a power transmission unit including a plurality of gear parts (not shown).
When the output of the drive device 16 is transmitted to the gear portion 8b of the drive cylinder 8 and the drive cylinder 8 rotates, the cam cylinder 5 moves along the optical axis direction while rotating. This is due to the action of the drive pin 5 f of the cam cylinder 5 and the rectilinear groove 8 a of the drive cylinder 8 and the action of the cam pin 5 e of the cam cylinder 5 and the cam groove 7 a of the fixed cylinder 7. Further, the first group barrel 1 is operated by the cam pin 1a of the first group barrel 1 and the cam groove 5a of the cam barrel 5, and by the straight groove 1b of the first group barrel 1 and the straight key 6a of the straight barrel 6. By this, it moves along the optical axis direction without rotating. The second group holding frame 2 is caused by the action of the cam pin 2a of the second group holding frame 2 and the cam groove 5b of the cam cylinder 5, and the action of the rectilinear key 2b of the second group holding frame 2 and the rectilinear groove 6b of the rectilinear cylinder 6. It moves in the optical axis direction without rotating. The diaphragm device 4 moves in the direction of the optical axis without rotating due to the action of the cam pin 4a and the cam groove 5c of the cam cylinder 5 and the action of the straight key 4b of the throttle apparatus 4 and the straight groove 6c of the straight cylinder 6. To do.
The third group holding frame 3 is formed with a positioning part 3a and a steadying part (not shown), and is movable along the optical axis direction while being engaged with the guide bars 10a, 11 arranged on the main plate 10. It is supported. Further, the third group holding frame 3 is provided with a nut (not shown) and is screwed into a lead screw (feed screw portion) of the stepping motor 13. When the nut screwed to the lead screw is driven by the output of the stepping motor 13, the third group holding frame 3 is not rotated by the action of the positioning part 3 a, the steadying part 3 b and the guide bars 10 a and 11. Move along the axial direction. The ground plane 10 holds the image sensor S and the optical filter F, and is fixed to the fixed cylinder 7 and the cover cylinder 9 by screw fastening.

図５はカム筒５およびキャップ１７を示す分解斜視図である。図６は１群鏡筒１の斜視図であり、図７（Ａ）は１群鏡筒１の側面図、図７（Ｂ）は図７（Ａ）に示すＥ部の拡大図である。また、図８（Ａ）はカム筒５の正面図、図８（Ｂ）はカム筒５の内周面を示す展開図である。本例では第１の筒体としての１群鏡筒１が、第２の筒体であるカム筒５の内側に配置される構成を示す。図９（Ａ）はレンズ鏡筒１００の撮影時ＷＩＤＥ状態の第２断面図であり、図２（Ａ）とは異なる切断面を示す。図９（Ｂ）は図９（Ａ）に示すＣ部の拡大図である。   FIG. 5 is an exploded perspective view showing the cam cylinder 5 and the cap 17. 6 is a perspective view of the first group barrel 1, FIG. 7 (A) is a side view of the first group barrel 1, and FIG. 7 (B) is an enlarged view of a portion E shown in FIG. 7 (A). 8A is a front view of the cam cylinder 5, and FIG. 8B is a development view showing the inner peripheral surface of the cam cylinder 5. FIG. In this example, a configuration is shown in which a first group barrel 1 as a first cylinder is disposed inside a cam cylinder 5 as a second cylinder. FIG. 9A is a second cross-sectional view of the lens barrel 100 in the WIDE state at the time of photographing, and shows a cut surface different from that in FIG. FIG. 9B is an enlarged view of a portion C shown in FIG.

以下、レンズ鏡筒１００にて不要な光の進入を防止するための構成について説明する。
レンズ鏡筒１００は、１群鏡筒１とカム筒５の筒体同士の間隙から進入する光に対して効果的な遮光構造を有する。図６および７に示すように、１群鏡筒１の後端部の外周面には、外径方向に突出する帯部１ｃが設けられている。本例では、帯部１ｃが外周面に亘って所定の厚みをもち、１群鏡筒１のうちで大径部を形成している。また図５および８に示すように、カム筒５の前端部には内径方向に突出する鍔部５ｇが設けられている。レンズ鏡筒１００の正面視（光軸方向視）にて、１群鏡筒１の帯部１ｃとカム筒５の鍔部５ｇは略一致して重なり合っている。図２（Ｂ）に示すように、１群鏡筒１とカム筒５との間隙から進入する光は、１群鏡筒１の帯部１ｃ（長さＬ参照）とカム筒５の鍔部５ｇとの間隙を光軸方向にて迂回する必要がある。このため、光が進入しづらくなっている。また、本実施形態ではカム筒５の前端部に、板金材料で形成したキャップ１７が配置されている。キャップ１７はリング部材であり、その内径はカム筒５の鍔部５ｇの内径とほぼ等しい。キャップ１７の内径をカム筒５の鍔部５ｇと同様に小さくすることにより、１群鏡筒１とキャップ１７との間隙からの光が進入しないように防止できる。なお、キャップ１７は板金部材に限らず、樹脂材料を用いてモールド部品として形成してもよい。 Hereinafter, a configuration for preventing the entry of unnecessary light in the lens barrel 100 will be described.
The lens barrel 100 has a light shielding structure that is effective against light entering from the gap between the first group barrel 1 and the cam barrel 5. As shown in FIGS. 6 and 7, the outer peripheral surface of the rear end portion of the first group barrel 1 is provided with a band portion 1 c protruding in the outer diameter direction. In this example, the band portion 1 c has a predetermined thickness over the outer peripheral surface, and forms a large diameter portion in the first group barrel 1. As shown in FIGS. 5 and 8, the front end portion of the cam cylinder 5 is provided with a flange portion 5 g protruding in the inner diameter direction. In a front view (viewed in the optical axis direction) of the lens barrel 100, the band portion 1c of the first group barrel 1 and the flange portion 5g of the cam barrel 5 are substantially coincident with each other and overlap each other. As shown in FIG. 2 (B), the light entering from the gap between the first group barrel 1 and the cam barrel 5 is the band portion 1c (see length L) of the first group barrel 1 and the collar portion of the cam barrel 5. It is necessary to bypass the gap with 5 g in the optical axis direction. For this reason, it is difficult for light to enter. In this embodiment, a cap 17 made of a sheet metal material is disposed at the front end of the cam cylinder 5. The cap 17 is a ring member, and the inner diameter thereof is substantially equal to the inner diameter of the flange portion 5 g of the cam cylinder 5. By reducing the inner diameter of the cap 17 in the same manner as the flange portion 5g of the cam cylinder 5, light from the gap between the first group barrel 1 and the cap 17 can be prevented from entering. The cap 17 is not limited to the sheet metal member, and may be formed as a molded part using a resin material.

ところで、図６および７に示すように、１群鏡筒１には複数の切り欠き部１ｄを設ける場合がある。切り欠き部１ｄは、レンズ鏡筒１００の沈胴状態で１群鏡筒１と直進筒６の突部６ｄなどが干渉しないように形成される。１群鏡筒１に切り欠き部１ｄを形成した場合、撮影領域で１群鏡筒１の帯部１ｃとカム筒５の内周面との光軸方向の重なり量（図２（Ｂ）の長さＬ参照）が少なくなってしまう。そのため、１群鏡筒１の切り欠き部１ｄから光が進入し易くなるおそれがある。本例に示す１群鏡筒１では、特に２群保持枠２のカムピン２ａや絞り装置４のカムピン４ａとの干渉を回避するための切り欠き部１ｄ１、１ｄ２（図６および７参照）が帯部１ｃに形成されている。これらの切り欠き部１ｄ１、１ｄ２は、深さ（光軸に平行な方向の長さ）が最も大きいため、光が進入しやすい部分である。さらに図５および８に示すように、カム筒５には、成型の金型要件で前端部に３個のピンゲート５ｈが設けられている。ピンゲート５ｈの落し込みのために、鍔部５ｇには前方を向いた切り欠き部５ｉが生じる。図９に示すように、レンズ鏡筒１００がＷＩＤＥ状態となる第１の位置関係では、光軸方向視で１群鏡筒１の切り欠き部１ｄ２とカム筒５の切り欠き部５ｉの位相角（光軸回り方向における角度位置）が略一致している。このため、カム筒５の切り欠き部５ｉから光が進入するおそれがある。カム筒５の切り欠き部５ｉはキャップ１７で覆い隠されているが、キャップ１７の板厚のみでカム筒５の外周面との間隙を狭めているため、切り欠き部５ｉが形成されていない場合と比較して光が進入する可能性が高い。また、位相関係においては、１群鏡筒１の切り欠き部１ｄ２とカム筒５の切り欠き部５ｉの他に直進筒６の直進溝６ｃも一致しているため、さらに光が進入する可能性が高まる。
そこで図６および７に示すように、１群鏡筒１の帯部１ｃにて切り欠き部１ｄ１、１ｄ２が形成された部分には、前方に延在する凸部１ｅを設けている。つまり、この凸部１ｅを帯部１ｃに含めることにより、帯部１ｃとカム筒５の内周面との間の光軸方向の重なり量（図２（Ｂ）の長さＬ参照）を大きくすることができる。従って１群鏡筒１の外周面に凸部１ｅを形成しない場合と比較して遮光効果が高い。また、本構成により撮影時ＷＩＤＥ状態では、１群鏡筒１の凸部１ｅとキャップ１７との隙間である、光軸方向の空間が狭まるため、光が進入しづらくなる。
By the way, as shown in FIGS. 6 and 7, the first group barrel 1 may be provided with a plurality of cutout portions 1d. The notch 1d is formed so that the first lens barrel 1 and the protrusion 6d of the rectilinear barrel 6 do not interfere with each other when the lens barrel 100 is retracted. When the cutout portion 1d is formed in the first group barrel 1, the amount of overlap in the optical axis direction between the band portion 1c of the first group barrel 1 and the inner peripheral surface of the cam barrel 5 in the imaging region (see FIG. 2B). The length L) is reduced. For this reason, light may easily enter from the cutout portion 1d of the first group barrel 1. In the first group barrel 1 shown in this example, notches 1d1 and 1d2 (see FIGS. 6 and 7) for avoiding interference with the cam pins 2a of the second group holding frame 2 and the cam pins 4a of the diaphragm device 4 are particularly provided. It is formed in the part 1c. Since these notches 1d1 and 1d2 have the largest depth (length in a direction parallel to the optical axis), they are portions where light easily enters. Further, as shown in FIGS. 5 and 8, the cam cylinder 5 is provided with three pin gates 5h at the front end portion according to molding die requirements. Due to the drop of the pin gate 5h, a notch portion 5i facing forward is formed in the flange portion 5g. As shown in FIG. 9 , in the first positional relationship in which the lens barrel 100 is in the WIDE state, the phase angle between the cutout portion 1d2 of the first group barrel 1 and the cutout portion 5i of the cam barrel 5 as viewed in the optical axis direction. (An angular position in the direction around the optical axis) is substantially the same. For this reason, there is a possibility that light may enter from the notch 5 i of the cam cylinder 5. The notch 5i of the cam cylinder 5 is covered with a cap 17, but the notch 5i is not formed because the gap with the outer peripheral surface of the cam cylinder 5 is narrowed only by the plate thickness of the cap 17. There is a high possibility that light will enter compared to the case. Further, in the phase relationship, the rectilinear groove 6c of the rectilinear cylinder 6 in addition to the notch part 1d2 of the first group barrel 1 and the notch part 5i of the cam cylinder 5 coincide with each other, so that light may enter further. Will increase.
Therefore, as shown in FIGS. 6 and 7, a protruding portion 1 e extending forward is provided at a portion where the notch portions 1 d 1 and 1 d 2 are formed in the band portion 1 c of the first group barrel 1. That is, by including the convex portion 1e in the band portion 1c, the amount of overlap in the optical axis direction between the band portion 1c and the inner peripheral surface of the cam cylinder 5 (see the length L in FIG. 2B) is increased. can do. Therefore, the light shielding effect is higher than in the case where the convex portion 1e is not formed on the outer peripheral surface of the first group barrel 1. Further, according to this configuration, in the WIDE state at the time of photographing, the space in the optical axis direction, which is the gap between the convex portion 1e of the first group barrel 1 and the cap 17, is narrowed, so that it is difficult for light to enter.

図８（Ｂ）には、カム筒５の内周面に形成したカム溝５ａ、５ｂ、５ｃと、鍔部５ｇ、切り欠き部５ｉ、５ｊの位置関係を示す。
１群鏡筒１はＴＥＬＥ状態（「５ａ ｔｅｌｅ」の位置を参照）でカム筒５から前方に最も離れる（図３（Ａ）参照）。レンズ鏡筒１００がＴＥＬＥ状態となる第２の位置関係にあるときには、１群鏡筒１の凸部１ｅが、カム筒５の鍔部５ｇに設けられた切り欠き部５ｊに入り込む構成になっている。カム筒５には切り欠き部５ｊが形成されているが、ＴＥＬＥ状態では図３（Ｂ）に示すように、１群鏡筒１の凸部１ｅがキャップ１７に接近する。これにより、凸部１ｅとキャップ１７と間隙（光軸に平行な方向の空間）が狭められ、光が進入しづらくなる。また、他の撮影状態では、光軸方向視での位相関係において、カム筒５の切り欠き部５ｊと１群鏡筒１の切り欠き部１ｄとは一致していない。あるいは切り欠き部１ｄの切り込み量が少ない箇所に切り欠き部５ｊが位置するため、光が進入しづらい。１群鏡筒１の切り欠き部１ｄ１、１ｄ２についても、他の撮影状態では、光軸方向視で切り欠き部１ｄ１、１ｄ２の位相角に対し、カム筒５の鍔部５ｇがこれらを覆い隠す。このため、上記と同様に光は進入しづらい。
第１実施形態によれば、１群鏡筒１やカム筒５に切り欠き部を設ける必要が生じた場合でも、筒体間に遮光シートなどの部材を設けることなく、外光への遮光対策を講じることができる。 FIG. 8B shows the positional relationship between the cam grooves 5a, 5b, and 5c formed on the inner peripheral surface of the cam cylinder 5, the flange portion 5g, and the notches 5i and 5j.
The first group barrel 1 is farthest away from the cam barrel 5 in the TELE state (see the position “5a tele”) (see FIG. 3A). When the lens barrel 100 is in the second positional relationship where the lens barrel 100 is in the TELE state, the convex portion 1e of the first group barrel 1 is configured to enter the notch portion 5j provided in the flange portion 5g of the cam barrel 5. Yes. The cam barrel 5 has a notch 5j. In the TELE state, the convex portion 1e of the first group barrel 1 approaches the cap 17, as shown in FIG. Thereby, the convex part 1e, the cap 17, and the space | interval (space of a direction parallel to an optical axis) are narrowed, and it becomes difficult for light to approach. In other imaging states, the notch portion 5j of the cam barrel 5 and the notch portion 1d of the first group barrel 1 do not coincide with each other in the phase relationship in the optical axis direction view. Or since the notch part 5j is located in the location where the cut amount of the notch part 1d is small, light does not enter easily. Regarding the cutout portions 1d1 and 1d2 of the first group barrel 1, in other photographing states, the flange portion 5g of the cam barrel 5 covers the phase angles of the cutout portions 1d1 and 1d2 when viewed in the optical axis direction. . For this reason, light is difficult to enter as described above.
According to the first embodiment, even when it becomes necessary to provide a cutout portion in the first group barrel 1 or the cam barrel 5, a measure for shielding light from outside light is provided without providing a member such as a light shielding sheet between the barrels. Can be taken.

［第２実施形態］
次に本発明の第２実施形態を説明する。
図１０（Ａ）は第２実施形態に係るレンズ鏡筒２００のカム筒の正面図であり、図１０（Ｂ）はカム筒を背面から見た場合の斜視図である。また、図１１（Ａ）はレンズ鏡筒２００の撮影時ＴＥＬＥ状態を示す断面図であり、図１１（Ｂ）は図１１（Ａ）のＤ部の拡大図である。なお、第２実施形態におけるレンズ鏡筒の構成において、第１実施形態に係るレンズ鏡筒と同様の構成要素については、既に使用した符号を用いることにより説明を省略し、以下では第１実施形態との相違点のみ説明する。
レンズ鏡筒２００では、第１実施形態にて説明したキャップ１７は設けられていない。また、カム筒５に切り欠き部５ｉ、５ｊは無く、代って３個の切り欠き部（凹部）５ｋが光軸回りに設けられている。切り欠き部５ｋは光軸に平行な方向に沿って貫通してはいないので、図１０（Ａ）に示すように光軸方向視では、カム筒５の前端面に現れておらず、外光が進入する余地は殆どない。レンズ鏡筒２００の撮影時ＴＥＬＥ状態にて、１群鏡筒１の凸部１ｅはカム筒５の切り欠き部５ｋに入り込む構成になっている。１群鏡筒１の凸部１ｅを全周に亘って設けた場合には、カム筒５の鍔部５ｇが薄肉になってしまう。そこで、鍔部５ｇの剛性および成型性を考慮して、切り欠き部１ｄ１、１ｄ２の位相角に対応したところにのみ凸部１ｅを設けている。本構成により、１群鏡筒１のうち、最も深い切り欠き部１ｄ１、１ｄ２の位相角にて、１群鏡筒１とカム筒５の内周面との間で光軸方向の重なり量（図１１（Ｂ）の長さＬ参照）を適正な量に確保できる。よって外光に対して充分な遮光対策を講じることができる。
以上、本発明の好ましい実施形態について説明したが、本発明はこれらの実施形態に限定されず、その要旨の範囲内で種々の変形及び変更が可能である。例えば、前記実施形態では、第１の筒体としての１群鏡筒１と、第２の筒体としてのカム筒５との間の遮光構造を例示したが、これに限定されず、その他の筒体同士にも本発明を適用できる。 [Second Embodiment]
Next, a second embodiment of the present invention will be described.
FIG. 10A is a front view of the cam barrel of the lens barrel 200 according to the second embodiment, and FIG. 10B is a perspective view when the cam barrel is viewed from the back. FIG. 11A is a cross-sectional view showing the TELE state at the time of shooting of the lens barrel 200, and FIG. 11B is an enlarged view of a portion D in FIG. 11A. In the configuration of the lens barrel according to the second embodiment, the same components as those of the lens barrel according to the first embodiment will be omitted by using the reference numerals already used, and hereinafter the first embodiment. Only the differences will be described.
In the lens barrel 200, the cap 17 described in the first embodiment is not provided. Further, the cam cylinder 5 does not have the notches 5i and 5j, and instead, three notches (recesses) 5k are provided around the optical axis. Since the notch 5k does not penetrate along the direction parallel to the optical axis, as shown in FIG. 10 (A), it does not appear on the front end surface of the cam cylinder 5 when viewed in the optical axis direction. There is little room for the to enter. The convex portion 1e of the first group barrel 1 enters the cutout portion 5k of the cam barrel 5 in the TELE state when the lens barrel 200 is photographed. When the convex part 1e of the first group barrel 1 is provided over the entire circumference, the flange part 5g of the cam cylinder 5 becomes thin. Therefore, in consideration of the rigidity and moldability of the flange portion 5g, the convex portion 1e is provided only at a location corresponding to the phase angle of the notches 1d1 and 1d2. With this configuration, the amount of overlap in the optical axis direction between the first group barrel 1 and the inner peripheral surface of the cam barrel 5 at the phase angle of the deepest notches 1d1 and 1d2 in the first group barrel 1 ( An appropriate amount can be ensured (see length L in FIG. 11B). Therefore, sufficient light shielding measures can be taken against external light.
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary. For example, in the above-described embodiment, the light shielding structure between the first group barrel 1 as the first cylinder and the cam cylinder 5 as the second cylinder is illustrated, but the present invention is not limited to this. The present invention can be applied to cylinders.

１ １群鏡筒
１ｃ 帯部
１ｄ，１ｄ１，１ｄ２ 切り欠き部
１ｅ 凸部
５ カム筒
５ｇ 鍔部
５ｈ ピンゲート
５ｉ，５ｊ，５ｋ 切り欠き部
１７ キャップ
１００，２００ レンズ鏡筒

1 1 group lens barrel 1c band 1d, 1d1, 1d2 notch 1e convex 5 cam barrel 5g collar 5h pin gate 5i, 5j, 5k notch 17 cap 100, 200 lens barrel

Claims (8)

第１の筒体と、前記第１の筒体が内側に配置される第２の筒体と、前記第１および第２の筒体を光軸方向に沿って相対的に移動させる機構部を備えたレンズ鏡筒であって、
前記第１の筒体には、前記第１の筒体の外径方向に突出する帯部が前記光軸方向にて結像面側の端部外周面に形成されており、
前記帯部は、前記光軸方向に沿って被写体側に突出する凸部を有し、
前記第２の筒体には、内径が前記帯部の外径よりも小さい鍔部が前記光軸方向にて被写体側の端部に形成されており、
前記鍔部は、前記光軸方向に一部が切り欠かれる第１の切り欠き部を有し、
前記第１の筒体と前記第２の筒体が第１の位置関係にある場合、前記光軸方向から見て光軸回り方向における前記凸部と前記第１の切り欠き部の位相角が一致していることを特徴とするレンズ鏡筒。 A first cylindrical body, and a second cylindrical body of the first tubular member is positioned inside, mechanism for relatively moving along the optical axis direction of the first and second cylindrical body A lens barrel provided,
Wherein the first cylindrical body is formed in an end outer peripheral surface of the image plane-side strip portion projecting radially outward of said first tubular member is in the optical axis direction,
The belt portion has a convex portion protruding toward the subject side along the optical axis direction,
In the second cylindrical body , a flange portion whose inner diameter is smaller than the outer diameter of the belt portion is formed at an end portion on the subject side in the optical axis direction ,
The collar portion has a first cutout portion that is partially cut out in the optical axis direction,
When the second tubular member and the first cylindrical body is in a first positional relationship, the phase angle of the said projecting portion in the optical axis direction when viewed from the optical axis direction first notch portion A lens barrel characterized by matching. 前記鍔部は、内径方向に一部が切り欠かれた第２の切り欠き部を有し、
前記第１の筒体および前記第２の筒体が第２の位置関係にある場合、前記凸部は前記第２の切り欠き部に対して前記光軸方向にて入り込んだ状態となることを特徴とする請求項１記載のレンズ鏡筒。 The flange portion has a second cutout portion that is partially cut out in the inner diameter direction,
If the first cylindrical body and said second cylindrical body is in the second positional relationship, the convex portion to be a state that has entered in the optical axis direction with respect to the second notch The lens barrel according to claim 1, wherein 前記第２の位置関係にて撮影時の望遠端位置にあることを特徴とする請求項２記載のレンズ鏡筒。   3. The lens barrel according to claim 2, wherein the lens barrel is in a telephoto end position at the time of photographing in the second positional relationship. 前記第１の位置関係にて撮影時の広角端位置にあることを特徴とする請求項１から３の何れか１項記載のレンズ鏡筒。   4. The lens barrel according to claim 1, wherein the lens barrel is located at a wide-angle end position at the time of photographing in the first positional relationship. 5. 前記第１の切り欠き部は、前記第２の筒体を成型するためのピンゲートの近傍に形成されていることを特徴とする請求項１から４の何れか１項記載のレンズ鏡筒。 Said first notch portion, said second lens barrel that is formed in the vicinity of the pin gate for molding the tubular body from claim 1, wherein either one of claims 4. 前記第２の筒体の前記鍔部の内径とほぼ等しい内径を有するリング部材を備え、
前記リング部材を前記第２の筒体の被写体側の端部に配置することを特徴とする請求項１から５の何れか１項記載のレンズ鏡筒。 A ring member having an inner diameter substantially equal to the inner diameter of the flange of the second cylinder,
6. The lens barrel according to claim 1 , wherein the ring member is disposed at an end of the second cylinder on the subject side . 前記凸部が形成された前記帯部のうち結像面側の端部には、前記光軸方向に一部が切り欠かれる第３の切り欠き部が形成されていることを特徴とする請求項１から６の何れか１項記載のレンズ鏡筒。 The end portion of the image plane side of the band portion to which the convex portion is formed, wherein, wherein the third cutout portion that partially notched in the optical axis direction is formed Item 7. The lens barrel according to any one of Items 1 to 6. 請求項１から７の何れか１項記載のレンズ鏡筒と、
前記レンズ鏡筒を通して被写体を撮像する撮像素子を備えることを特徴とする撮像装置。
The lens barrel according to any one of claims 1 to 7,
An image pickup apparatus comprising an image pickup device for picking up an image of a subject through the lens barrel.
JP2011129551A 2011-06-09 2011-06-09 Lens barrel and imaging device Expired - Fee Related JP5791380B2 (en)

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