JP5665344B2 - Lens barrel and imaging device - Google Patents

Lens barrel and imaging device Download PDF

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JP5665344B2
JP5665344B2 JP2010081923A JP2010081923A JP5665344B2 JP 5665344 B2 JP5665344 B2 JP 5665344B2 JP 2010081923 A JP2010081923 A JP 2010081923A JP 2010081923 A JP2010081923 A JP 2010081923A JP 5665344 B2 JP5665344 B2 JP 5665344B2
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barrier
spring
blade
barrier blade
lens barrel
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JP2011215280A (en
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圭祐 足立
圭祐 足立
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Canon Inc
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Description

本発明は、撮影光学系の被写体側に設けられたバリアカバーの撮影用開口部を開閉自在に覆うバリア羽根を備えるレンズ鏡筒及び該レンズ鏡筒を備える撮像装置に関する。   The present invention relates to a lens barrel including a barrier blade that covers a shooting opening of a barrier cover provided on the subject side of a shooting optical system so as to be openable and closable, and an imaging apparatus including the lens barrel.

従来、この種のレンズ鏡筒としては、次に示すものが知られている(特許文献1)。このレンズ鏡筒は、バリアカバーの撮影用開口部を開閉自在に覆う一対のバリア羽根と、一対のバリア羽根を開閉方向に回転動作させるバリア駆動部材とを備える。また、バリア羽根とバリア駆動部材との間には、バリア羽根の開閉に伴ってチャージ量が変化するバリア駆動ばねが設けられている。   Conventionally, as this type of lens barrel, the following is known (Patent Document 1). The lens barrel includes a pair of barrier blades that cover a photographing opening of the barrier cover so as to be freely opened and closed, and a barrier driving member that rotates the pair of barrier blades in the opening and closing direction. In addition, a barrier drive spring is provided between the barrier blade and the barrier drive member, the charge amount of which changes with the opening and closing of the barrier blade.

そして、レンズ鏡筒が沈胴位置から撮影位置に移動する際には、バリア駆動ばねの張力によってバリア駆動部材がバリア羽根を押しながら回転してバリア羽根を全開位置まで回動させる。これにより、バリア羽根が全閉状態から全開状態に移行する。このとき、バリア駆動ばねは、チャージ量が漸次的に減少し、バリア羽根を開くための開きばねとして機能する。   Then, when the lens barrel moves from the retracted position to the photographing position, the barrier driving member rotates while pushing the barrier blade by the tension of the barrier driving spring to rotate the barrier blade to the fully open position. Thereby, a barrier blade | wing transfers to a fully open state from a fully closed state. At this time, the barrier drive spring functions as an opening spring for opening the barrier blade, with the charge amount gradually decreasing.

一方、レンズ鏡筒が撮影位置から沈胴位置に移動する際には、バリア駆動部材は、直進筒とのカム係合により強制的に全閉位置まで回転させられ、バリア羽根は、バリア駆動ばねにより閉じ方向に付勢される。これにより、バリア羽根が全開状態から全閉状態に移行する。このとき、バリア駆動ばねは、チャージ量が漸次的に増加し、バリア羽根を閉じるための閉じばねとして機能する。   On the other hand, when the lens barrel moves from the photographing position to the retracted position, the barrier driving member is forcibly rotated to the fully closed position by cam engagement with the rectilinear cylinder, and the barrier blade is moved by the barrier driving spring. Energized in the closing direction. Thereby, a barrier blade | wing transfers to a fully closed state from a fully open state. At this time, the barrier drive spring functions as a closing spring for closing the barrier blade as the charge amount gradually increases.

このようにして、バリア駆動ばねに閉じばね及び開きばねの両方の機能を持たせることにより、部品点数を削減し、レンズ鏡筒の小型化を達成している。   In this way, by providing the barrier drive spring with the functions of both a closing spring and an opening spring, the number of parts is reduced and the lens barrel is reduced in size.

特開2008−033152号公報JP 2008-033152 A

しかし、上記特許文献1では、バリア駆動ばねがバリア羽根の回転平面に対して像面側に配置されるため、バリア駆動ばねの張力の作用線とバリア羽根の回転中心線との交点が、バリア羽根の回転平面から光軸方向にずれてしまう。このため、バリア羽根に開閉方向とは異なる方向に回転モーメントが作用し、この回転モーメントによりバリア羽根が変形する、所謂あおりが発生する場合がある。この結果、一対のバリア羽根の全閉状態においてバリア羽根同士が合わなくなる等の問題が生じる。   However, in Patent Document 1, since the barrier drive spring is disposed on the image plane side with respect to the rotation plane of the barrier blade, the intersection of the action line of the tension of the barrier drive spring and the rotation center line of the barrier blade is the barrier. It will shift in the optical axis direction from the plane of rotation of the blade. For this reason, a rotational moment acts on the barrier blade in a direction different from the opening and closing direction, and a so-called tilt may occur in which the barrier blade is deformed by this rotational moment. As a result, there arises a problem that the barrier blades do not match each other in the fully closed state of the pair of barrier blades.

そこで、本発明は、部品点数の削減とレンズ鏡筒の小型化を達成することができるとともに、バリア駆動ばねの張力によるバリア羽根の変形を防止することができるレンズ鏡筒及び撮像装置を提供することを目的とする。 Accordingly, the present invention provides a lens barrel and an imaging apparatus that can achieve a reduction in the number of components and a reduction in size of the lens barrel and can prevent deformation of the barrier blades due to the tension of the barrier drive spring. For the purpose.

上記目的を達成するために、本発明のレンズ鏡筒は、撮影用開口部を開閉自在に覆う一対のバリア羽根と、前記バリア羽根を開閉方向に回転動作させるバリア駆動部材と、前記バリア羽根及び前記バリア駆動部材にそれぞれ掛止され、前記バリア駆動部材を前記バリア羽根の開き方向に付勢するとともに、前記バリア羽根の開閉に伴ってチャージ量が変化するバリア駆動ばねと、を備え、前記バリア駆動ばねは、前記バリア羽根が全閉状態から全開状態に移動するときに、チャージ量が減少し、前記バリア羽根が全開状態から全閉状態に移動するときに、チャージ量が増加するレンズ鏡筒であって、前記バリア駆動ばねは、前記バリア駆動部材における前記バリア駆動ばねの掛止位置と前記バリア羽根における前記バリア駆動ばねの掛止位置とを結ぶ方向に張力を発生させる引張りばねであり、前記バリア駆動部材における前記バリア駆動ばねの掛止位置と前記バリア羽根における前記バリア駆動ばねの掛止位置とを光軸方向にずらして配置し、前記バリア駆動ばねにより前記バリア羽根に作用する前記張力の作用線と前記バリア羽根の回転中心線との交点は、前記バリア羽根の回転平面と前記バリア羽根の回転中心線との交点と略一致する位置に配置されることを特徴とする。 In order to achieve the above object, a lens barrel according to the present invention includes a pair of barrier blades that openably and closably open an imaging opening, a barrier drive member that rotates the barrier blades in the opening and closing direction, the barrier blades, A barrier drive spring that is respectively latched on the barrier drive member, biases the barrier drive member in the opening direction of the barrier blade, and changes the charge amount as the barrier blade is opened and closed. The drive spring has a lens barrel whose charge amount decreases when the barrier blade moves from the fully closed state to the fully open state and increases when the barrier blade moves from the fully open state to the fully closed state. The barrier drive spring includes a latch position of the barrier drive spring in the barrier drive member and a latch position of the barrier drive spring in the barrier blade. The a tension spring to generate a tension in the direction connecting, arranged by shifting the locking position of the barrier drive spring in the barrier blades and locking position of the barrier drive spring in the barrier driving member in the optical axis direction, The intersection of the line of tension acting on the barrier blade by the barrier drive spring and the rotation center line of the barrier blade substantially coincides with the intersection of the rotation plane of the barrier blade and the rotation center line of the barrier blade. It is arranged at a position .

本発明によれば、部品点数の削減とレンズ鏡筒の小型化を達成することができるとともに、バリア駆動ばねの張力によるバリア羽根の変形を防止することができる。   According to the present invention, the number of parts can be reduced and the lens barrel can be reduced in size, and deformation of the barrier blades due to the tension of the barrier drive spring can be prevented.

本発明の実施形態の一例であるレンズ鏡筒の分解斜視図である。It is a disassembled perspective view of the lens barrel which is an example of embodiment of this invention. バリア羽根が全閉した状態を示す図である。It is a figure which shows the state which the barrier blade | wing fully closed. バリア羽根が全開した状態を示す図である。It is a figure which shows the state which the barrier blade | wing fully opened. バリア羽根、バリア駆動ばね及びバリア駆動部材に作用する力とモーメントについて説明するための説明図である。It is explanatory drawing for demonstrating the force and moment which act on a barrier blade | wing, a barrier drive spring, and a barrier drive member. バリア羽根の斜視図である。It is a perspective view of a barrier blade. バリア羽根のばね掛け部とバリア駆動部材のばね掛け部にバリア駆動ばねを掛止した状態を示す概略図である。It is the schematic which shows the state which latched the barrier drive spring to the spring hook part of the barrier blade | wing, and the spring hook part of the barrier drive member.

以下、本発明の実施形態の一例を図面を参照して説明する。   Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

図1は本発明の実施形態の一例であるレンズ鏡筒の分解斜視図、図2はバリア羽根が全閉した状態を示す図、図3はバリア羽根が全開した状態を示す図である。なお、本実施形態では、撮影位置と収納位置との間を光軸方向に移動して撮影倍率を変更するズーム機構を備えるレンズ鏡筒を例に採る。   FIG. 1 is an exploded perspective view of a lens barrel as an example of an embodiment of the present invention, FIG. 2 is a diagram showing a state in which a barrier blade is fully closed, and FIG. 3 is a diagram showing a state in which the barrier blade is fully opened. In the present embodiment, a lens barrel including a zoom mechanism that changes the shooting magnification by moving in the optical axis direction between the shooting position and the storage position is taken as an example.

図1に示すように、本実施形態のレンズ鏡筒10は、レンズ15を保持するレンズホルダ16の内周側に、レンズホルダ16の回転を規制する直進筒17が設けられている。レンズホルダ16の像面側の端部外周部には、カム筒18の内周部に形成されたカム溝18aに追従するカムフォロア16aが周方向に略等間隔で複数箇所突設されている。また、直進筒17とカム筒18とは、バヨネット結合等により結合されて、相対回転可能に光軸方向に一体に移動する。   As shown in FIG. 1, in the lens barrel 10 of the present embodiment, a rectilinear cylinder 17 that restricts the rotation of the lens holder 16 is provided on the inner peripheral side of the lens holder 16 that holds the lens 15. A plurality of cam followers 16 a that follow cam grooves 18 a formed in the inner peripheral portion of the cam cylinder 18 are provided at a plurality of positions in the circumferential direction at substantially equal intervals on the outer peripheral portion of the end portion on the image plane side of the lens holder 16. Further, the rectilinear cylinder 17 and the cam cylinder 18 are coupled by bayonet coupling or the like, and move integrally in the optical axis direction so as to be relatively rotatable.

そして、不図示のデジタルカメラ等の撮像装置の電源スイッチがON操作されると、カム筒18は、不図示の駆動機構を介して回転駆動されて、回転しながら光軸方向に繰出される。カム筒18のカム溝18aは、レンズ鏡筒10の沈胴位置から撮影位置までの間でレンズホルダ16が相対的に光軸方向に繰出されるようなリフト量を有している。   When a power switch of an image pickup apparatus such as a digital camera (not shown) is turned on, the cam cylinder 18 is driven to rotate through a drive mechanism (not shown) and extended in the optical axis direction while rotating. The cam groove 18a of the cam barrel 18 has a lift amount so that the lens holder 16 is relatively extended in the optical axis direction from the retracted position of the lens barrel 10 to the photographing position.

従って、カム筒18の回転により、レンズホルダ16は、直進筒17により回転を規制された状態でカム筒18に対して相対的に被写体側へ繰出される。また、直進筒17とカム筒18とは光軸方向に一体に移動するため、レンズホルダ16は、直進筒17に対しても相対的に光軸方向に繰出されることになる。   Accordingly, the lens holder 16 is extended toward the subject relative to the cam cylinder 18 in a state in which the rotation is restricted by the rectilinear cylinder 17 by the rotation of the cam cylinder 18. Further, since the rectilinear cylinder 17 and the cam cylinder 18 move integrally in the optical axis direction, the lens holder 16 is extended relative to the rectilinear cylinder 17 in the optical axis direction.

一方、撮像装置の電源スイッチがOFF操作されると、カム筒18は、回転しながら光軸方向に繰込まれる。レンズホルダ16は、カム筒18に対して相対的に光軸方向に繰込まれていくため、直進筒17に対しても相対的に繰込まれていく。   On the other hand, when the power switch of the imaging apparatus is turned off, the cam cylinder 18 is fed in the optical axis direction while rotating. Since the lens holder 16 is retracted relative to the cam barrel 18 in the optical axis direction, the lens holder 16 is also retracted relative to the rectilinear barrel 17.

レンズホルダ16に保持されたレンズ15の被写体側には、バリアカバー11の撮影用開口部11aを開閉自在に覆う一対のバリア羽根12と、一対のバリア羽根12を開閉方向に回転動作させるバリア駆動部材14とが配置されている。また、バリア羽根12とバリア駆動部材14との間には、バリア羽根12の開閉に伴ってチャージ量が変化するバリア駆動ばね13が設けられている。   On the subject side of the lens 15 held by the lens holder 16, a pair of barrier blades 12 that covers the photographing opening 11 a of the barrier cover 11 so as to be freely opened and closed, and a barrier drive that rotates the pair of barrier blades 12 in the opening and closing direction. A member 14 is arranged. In addition, a barrier drive spring 13 is provided between the barrier blade 12 and the barrier drive member 14 so that the charge amount changes as the barrier blade 12 opens and closes.

バリア羽根12は、本実施形態では、薄型化を図るために、ステンレス鋼等の金属薄板にプレし加工を施して形成されている。このため、バリア羽根12に回転軸を設けることが難しいことから、図2に示すように、バリア羽根12の回転支点に軸穴12aを形成して、該軸穴12aをレンズホルダ16に設けた回転軸16aに嵌合している。これにより、バリア羽根12がレンズホルダ16に対して回転可能に支持される。   In the present embodiment, the barrier blades 12 are formed by pre-processing a thin metal plate such as stainless steel in order to reduce the thickness. For this reason, since it is difficult to provide a rotation axis for the barrier blade 12, as shown in FIG. The rotary shaft 16a is fitted. As a result, the barrier blade 12 is rotatably supported with respect to the lens holder 16.

バリア駆動部材14は、略円環状に形成されて、レンズホルダ16に対して回転可能に支持されている。また、バリア駆動部材14には、図2及び図3に示すように、バリア羽根12を開く際に、バリア羽根12の軸穴12aの近傍に設けられた当接部12cに当接する当接部14aが設けられている。また、バリア駆動部材14には、図1に示すように、レンズ鏡筒10の沈胴動作時に直進筒17に設けられたカム部17aにカム係合するカム片14cが像面側に延びて設けられている。   The barrier driving member 14 is formed in a substantially annular shape and is supported so as to be rotatable with respect to the lens holder 16. 2 and 3, when the barrier blade 12 is opened, the barrier drive member 14 is in contact with a contact portion 12c provided in the vicinity of the shaft hole 12a of the barrier blade 12. 14a is provided. Further, as shown in FIG. 1, the barrier driving member 14 is provided with a cam piece 14c that is cam-engaged with a cam portion 17a provided on the rectilinear cylinder 17 when the lens barrel 10 is retracted. It has been.

バリア駆動ばね13は、本実施形態では、例えば引張りコイルばねを用いており、一端がバリア羽根12の軸穴12aと当接部12cとの間に設けられたばね掛け部12bに掛止され、他端がバリア駆動部材14に設けられたばね掛け部14bに掛止されている。バリア駆動ばね13により、バリア羽根12及びバリア駆動部材14は、当接部12cと当接部14aとが当接する方向に付勢される。   In this embodiment, for example, a tension coil spring is used as the barrier drive spring 13. One end of the barrier drive spring 13 is hooked on a spring hooking portion 12 b provided between the shaft hole 12 a of the barrier blade 12 and the contact portion 12 c. The end is hooked on a spring hooking portion 14 b provided on the barrier driving member 14. The barrier drive spring 13 biases the barrier blade 12 and the barrier drive member 14 in a direction in which the contact portion 12c and the contact portion 14a contact each other.

そして、不図示の撮像装置の電源スイッチがON操作されると、レンズホルダ16は、直進筒17に対して相対的に光軸方向に繰出されるため、バリア駆動部材14と直進筒17との光軸方向の間隔が広がって、カム片14cとカム部17aとの係合が解除される。   When the power switch of the imaging device (not shown) is turned on, the lens holder 16 is extended in the optical axis direction relative to the rectilinear cylinder 17, so that the barrier drive member 14 and the rectilinear cylinder 17 The interval in the optical axis direction is widened, and the engagement between the cam piece 14c and the cam portion 17a is released.

このとき、バリア駆動ばね13は、開きばねとして機能し、図3に示すように、そのチャージ量を漸次的に減少させながらバリア駆動部材14を矢印A方向に回転させる。これにより、バリア羽根12の当接部12が当接部14aにより押されてバリア羽根12が開方向に回転し、バリア羽根12が全開状態となって撮影用開口部11aが開放される。 At this time, the barrier drive spring 13 functions as an opening spring, and rotates the barrier drive member 14 in the arrow A direction while gradually decreasing the charge amount as shown in FIG. Thus, the contact portion 12 c of the barrier blade 12 abutting portion pushed by 14a rotates barrier blades 12 in the opening direction, barrier blades 12 are photographic opening 11a fully opened state is released.

一方、バリア羽根12の全開状態で不図示の撮像装置の電源スイッチがOFF操作されると、レンズホルダ16は、直進筒17に対して相対的に光軸方向に繰込まれていくため、バリア駆動部材14と直進筒17との間隔は次第に狭くなる。そして、バリア駆動部材14のカム片14cが直進筒17のカム部17aにカム係合して、カム片14cとカム部17aとのカム作用によりバリア駆動部材14が強制的に矢印B方向に回転させられ、バリア駆動ばね13のチャージ量を漸次的に増加させていく。   On the other hand, when the power switch of the imaging device (not shown) is turned off with the barrier blades 12 fully open, the lens holder 16 is retracted relative to the rectilinear cylinder 17 in the optical axis direction. The distance between the drive member 14 and the rectilinear cylinder 17 is gradually narrowed. Then, the cam piece 14c of the barrier drive member 14 is cam-engaged with the cam portion 17a of the rectilinear cylinder 17, and the barrier drive member 14 is forcibly rotated in the arrow B direction by the cam action of the cam piece 14c and the cam portion 17a. The charge amount of the barrier drive spring 13 is gradually increased.

このとき、バリア駆動ばね13は、閉じばねとして機能し、図2に示すように、バリア羽根12を閉じ方向に回転させて全閉状態とすることで、撮影用開口部11aを覆う。   At this time, the barrier drive spring 13 functions as a closing spring, and as shown in FIG. 2, the barrier blade 12 is rotated in the closing direction to be in the fully closed state, thereby covering the imaging opening 11a.

次に、図4を参照して、バリア羽根12、バリア駆動ばね13及びバリア駆動部材14に作用する力とモーメントについて説明する。   Next, with reference to FIG. 4, the force and moment which act on the barrier blade | wing 12, the barrier drive spring 13, and the barrier drive member 14 are demonstrated.

図2のバリア羽根12の全閉状態からレンズ鏡筒10がわずかに光軸方向に繰出されて、バリア駆動部材14と直進筒17との間隔が広がると、カム片14cとカム部17aとのカム作用によりバリア駆動部材14が矢印A方向に回転し始める。これにより、バリア羽根12の当接部12cにバリア駆動部材14の当接部14aで当接して、図4に示す状態となる。   When the lens barrel 10 is slightly extended in the optical axis direction from the fully closed state of the barrier blade 12 shown in FIG. 2 and the distance between the barrier drive member 14 and the rectilinear cylinder 17 increases, the cam piece 14c and the cam portion 17a The barrier driving member 14 starts to rotate in the direction of arrow A by the cam action. As a result, the abutting portion 12c of the barrier blade 12 abuts on the abutting portion 14a of the barrier driving member 14, and the state shown in FIG. 4 is obtained.

ここで、図4において、バリア駆動ばね13の張力をP、バリア駆動部材14の回転中心点とばね掛け部14bにおける張力Pの作用点までの距離をL1とする。また、バリア駆動部材14の回転中心点とばね掛け部14bにおける張力Pの作用点とを結ぶ直線に対して前記作用点で直角に交わる直線と、張力Pの作用線との角度をA1とする。   Here, in FIG. 4, the tension of the barrier drive spring 13 is P, and the distance from the rotation center point of the barrier drive member 14 to the point of action of the tension P at the spring hook 14b is L1. In addition, the angle between a straight line that intersects at a right angle at the action point with respect to a straight line that connects the rotation center point of the barrier driving member 14 and the action point of the tension P at the spring hook 14b and the action line of the tension P is A1. .

また、バリア羽根12の回転中心点とばね掛け部12bにおける張力Pの作用点との距離をL2とする。更に、バリア羽根12の回転中心点とばね掛け部12bにおける張力Pの作用点とを結ぶ線に対して前記作用点で直角に交わる直線と、張力Pの作用線との角度をA2とする。   The distance between the rotation center point of the barrier blade 12 and the point of action of the tension P at the spring hook 12b is L2. Furthermore, an angle between a straight line that intersects at a right angle at the point of action with respect to a line connecting the rotation center point of the barrier blade 12 and the point of action of the tension P in the spring hook 12b and the line of action of the tension P is A2.

更に、バリア羽根12の回転中心点と当接部14aとの距離をL3、バリア駆動部材14の回転中心点と当接部14aとの距離をL4とする。更に、バリア羽根12の回転中心点と当接部14aとを結ぶ直線に対して当接部14aで直角に交わる直線と、バリア駆動部材14の回転中心点と当接部14aとを結ぶ直線に対して当接部14aで直角に交わる直線との角度をA3とする。   Furthermore, the distance between the rotation center point of the barrier blade 12 and the contact portion 14a is L3, and the distance between the rotation center point of the barrier drive member 14 and the contact portion 14a is L4. Further, a straight line that intersects at a right angle at the contact portion 14a with respect to a straight line that connects the rotation center point of the barrier blade 12 and the contact portion 14a, and a straight line that connects the rotation center point of the barrier drive member 14 and the contact portion 14a. On the other hand, the angle between the contact portion 14a and a straight line that intersects at a right angle is A3.

このとき、バリア駆動部材14を矢印A方向に回転させるモーメントM1は、M1=PcosA1×L1となる。また、バリア駆動部材14を矢印B方向に回転させるモーメントM2は、M2=(PcosA2×L2/L3)cosA3×L4となる。   At this time, the moment M1 for rotating the barrier drive member 14 in the direction of arrow A is M1 = PcosA1 × L1. Further, the moment M2 for rotating the barrier driving member 14 in the arrow B direction is M2 = (PcosA2 × L2 / L3) cosA3 × L4.

従って、バリア駆動部材14を矢印A方向に回転させるための条件は、M1>M2=PcosA1×L1>(PcosA2×L2/L3)cosA3×L4となり、この式を変形すると、L1×L3cosA1>L2×L4cosA2cosA3(式(1))となる。   Therefore, the condition for rotating the barrier driving member 14 in the direction of arrow A is M1> M2 = PcosA1 × L1> (PcosA2 × L2 / L3) cosA3 × L4. When this equation is modified, L1 × L3cosA1> L2 × L4cosA2cosA3 (formula (1)).

上式(1)の条件を満たすことで、バリア駆動部材14を矢印A方向に回転させると、バリア駆動ばね13のチャージ量は漸次的に減少して、バリア羽根12を開かせる。つまり、バリア駆動ばね13が開きばねとして機能する。   By satisfying the condition of the above formula (1), when the barrier driving member 14 is rotated in the direction of arrow A, the charge amount of the barrier driving spring 13 is gradually reduced, and the barrier blade 12 is opened. That is, the barrier drive spring 13 functions as an opening spring.

図4の状態からバリア駆動部材14がさらに矢印A方向に回転すると、バリア駆動ばね13チャージ量はさらに減少していき、バリア羽根12をバリアカバー11の内周部に当接するまで開かせる。このとき、バリア羽根12は、図3に示す全開状態となり、上式(1)の条件を満たすことで、バリア駆動ばね13の張力によって全開状態が維持される。   When the barrier driving member 14 further rotates in the direction of arrow A from the state of FIG. At this time, the barrier blade 12 is in the fully open state shown in FIG. 3, and the fully open state is maintained by the tension of the barrier drive spring 13 by satisfying the condition of the above equation (1).

なお、ここでは1本のバリア駆動ばね13による条件式を説明したが、2本のバリア駆動ばね13の場合は、上式(1)の両辺を2倍するだけであり、結果として条件式は、上式(式1)と同様である。   In addition, although the conditional expression by one barrier drive spring 13 was demonstrated here, in the case of two barrier drive springs 13, only the both sides of said Formula (1) are doubled, and as a result conditional expression is This is the same as the above formula (Formula 1).

また、バリア羽根12が図4に示す状態から図2に示す全閉状態になると、バリア羽根12の当接部12cとバリア駆動部材14の当接部14aとの当接は解除され、バリア駆動部材14のカム片14cが直進筒17のカム部17aに嵌め込まれる。これにより、バリア駆動部材14の回転が規制されて、バリア羽根12は、バリア駆動ばね13によって閉じ方向に付勢され、モーメントMc=PcosA2×L2が作用する。つまり、バリア駆動ばね13が閉じばねとして機能する。   Further, when the barrier blade 12 changes from the state shown in FIG. 4 to the fully closed state shown in FIG. 2, the contact between the contact portion 12c of the barrier blade 12 and the contact portion 14a of the barrier drive member 14 is released, and the barrier drive is performed. The cam piece 14 c of the member 14 is fitted into the cam portion 17 a of the rectilinear cylinder 17. As a result, the rotation of the barrier driving member 14 is restricted, and the barrier blade 12 is urged in the closing direction by the barrier driving spring 13, and the moment Mc = PcosA2 × L2 acts. That is, the barrier drive spring 13 functions as a closing spring.

このようにして、バリア駆動ばね12に閉じばね及び開きばねの両方の機能を持たせることにより、部品点数を削減し、レンズ鏡筒の小型化を達成している。   In this way, by providing the barrier drive spring 12 with the functions of both a closing spring and an opening spring, the number of parts is reduced and the lens barrel is reduced in size.

次に、図5を参照して、バリア羽根12の形状について説明する。図5は、バリア羽根12の斜視図である。   Next, the shape of the barrier blade 12 will be described with reference to FIG. FIG. 5 is a perspective view of the barrier blade 12.

図5に示すように、バリア羽根12には、上述した軸穴12a、ばね掛け部12b及び当接部12cが設けられており、ばね掛け部12bは、先端部が軸穴12aに接近する方向に鋭角に曲げ加工されている。   As shown in FIG. 5, the barrier blade 12 is provided with the shaft hole 12a, the spring hooking portion 12b, and the contact portion 12c described above, and the spring hooking portion 12b is a direction in which the tip portion approaches the shaft hole 12a. It is bent at an acute angle.

バリア駆動ばね13は、ばね掛け部12bの基端側に掛止されるが、ばね掛け部12bの先端側に掛止されても、ばね掛け部12bが鋭角に曲げ加工されていることから、バリア駆動ばね13は自身の張力によってばね掛け部12bの基端側に誘導される。また、ばね掛け部12bは、基端側よりも先端側の幅を広くしているため、バリア駆動ばね13が一度基端側に掛止されると、外れにくい構造になっている。   The barrier drive spring 13 is hooked on the base end side of the spring hooking portion 12b, but even if hooked on the distal end side of the spring hooking portion 12b, the spring hooking portion 12b is bent at an acute angle. The barrier drive spring 13 is guided to the proximal end side of the spring hook 12b by its own tension. Further, since the spring hooking portion 12b is wider on the distal end side than on the proximal end side, the spring driving portion 12b has a structure that is difficult to come off once the barrier drive spring 13 is hooked on the proximal end side.

図6は、バリア羽根12のばね掛け部12bとバリア駆動部材14のばね掛け部14bにバリア駆動ばね13を掛止した状態を示す概略図である。   FIG. 6 is a schematic view showing a state in which the barrier driving spring 13 is hooked on the spring hooking portion 12 b of the barrier blade 12 and the spring hooking portion 14 b of the barrier driving member 14.

上述したように、バリア駆動ばね13は、バリア羽根12のばね掛け部12bの基端側に掛止される。ここで、バリア駆動ばね13のバリア駆動部材14のばね掛け部14aに対する掛止位置は、バリア羽根12のばね掛け部12bの掛止位置より像面側にずれて配置されている。このため、バリア駆動ばね13におけるバリア羽根12のばね掛け部12bの掛止位置とバリア駆動部材14のばね掛け部14bの掛止位置との間に光軸方向に差が生じ、バリア駆動ばね13は、回転平面Hに対して角度A4だけ傾いて配置されることになる。   As described above, the barrier drive spring 13 is hooked on the base end side of the spring hooking portion 12 b of the barrier blade 12. Here, the latching position of the barrier driving spring 13 with respect to the spring hooking portion 14a of the barrier driving member 14 is shifted from the hooking position of the spring hooking portion 12b of the barrier blade 12 toward the image plane side. Therefore, a difference occurs in the optical axis direction between the latching position of the spring hooking portion 12b of the barrier blade 12 and the latching position of the spring hooking portion 14b of the barrier driving member 14 in the barrier driving spring 13, and the barrier driving spring 13 Is inclined with respect to the rotation plane H by an angle A4.

次に、バリア羽根12に作用する力とモーメントについて説明する。バリア羽根12に作用する張力Pは、バリア駆動ばね13のバリア羽根12のばね掛け部12bの掛止位置とバリア駆動部材14のばね掛け部14bの掛止位置とを結んだ線上に作用する。つまり、張力Pの作用線は、バリア羽根12の回転平面Hに対して角度A4だけ傾いている。   Next, the force and moment acting on the barrier blade 12 will be described. The tension P acting on the barrier blade 12 acts on a line connecting the hook position of the spring hook portion 12b of the barrier blade 12 of the barrier drive spring 13 and the hook position of the spring hook portion 14b of the barrier drive member 14. That is, the line of action of the tension P is inclined by the angle A4 with respect to the rotation plane H of the barrier blade 12.

この張力Pの作用線とバリア羽根12の回転中心線との交点をXとすると、交点Xは、回転平面Hとバリア羽根12の回転中心線との交点と略一致する位置に配置される。これにより、張力Pの回転平面H方向の成分であるPcosA4は、矢印C方向の回転モーメントには寄与しないことになり、バリア羽根12を変形させる回転モーメントは発生しないことになる。   Assuming that the intersection point of the action line of the tension P and the rotation center line of the barrier blade 12 is X, the intersection point X is arranged at a position substantially coincident with the intersection point of the rotation plane H and the rotation center line of the barrier blade 12. As a result, PcosA4, which is a component of the tension P in the direction of the rotation plane H, does not contribute to the rotation moment in the direction of arrow C, and no rotation moment that deforms the barrier blade 12 is generated.

以上説明したように、本実施形態では、バリア駆動ばね12に閉じばね及び開きばねの両方の機能を持たせることができるので、部品点数を削減して、レンズ鏡筒の小型化を達成することができる。   As described above, in this embodiment, since the barrier drive spring 12 can have both functions of a closing spring and an opening spring, the number of parts can be reduced and the lens barrel can be downsized. Can do.

また、本実施形態では、バリア駆動ばね13の張力がバリア羽根12を変形させる回転モーメントに寄与しないため、バリア駆動ばね13の張力によるバリア羽根12の変形を防止することができる。特に、回転軸の形成が困難で軸穴12aと他の部材の回転軸16aとの嵌合長さが十分に確保できない薄型のバリア羽根12についても、バリア駆動ばね13の張力によるバリア羽根12の変形を良好に防止することができる。   Further, in this embodiment, since the tension of the barrier drive spring 13 does not contribute to the rotational moment that deforms the barrier blade 12, the deformation of the barrier blade 12 due to the tension of the barrier drive spring 13 can be prevented. In particular, even for a thin barrier blade 12 in which the formation of the rotation shaft is difficult and the fitting length between the shaft hole 12 a and the rotation shaft 16 a of another member cannot be sufficiently ensured, Deformation can be satisfactorily prevented.

なお、本発明の構成は、上記実施形態に例示したものに限定されるものではなく、材質、形状、寸法、形態、数、配置箇所等は、本発明の要旨を逸脱しない範囲において適宜変更可能である。   The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

10 レンズ鏡筒
11 バリアカバー
12 バリア羽根
13 バリア駆動ばね
14 バリア駆動部材
17 直進筒
DESCRIPTION OF SYMBOLS 10 Lens barrel 11 Barrier cover 12 Barrier blade 13 Barrier drive spring 14 Barrier drive member 17 Straight advance cylinder

Claims (6)

撮影用開口部を開閉自在に覆う一対のバリア羽根と、前記バリア羽根を開閉方向に回転動作させるバリア駆動部材と、前記バリア羽根及び前記バリア駆動部材にそれぞれ掛止され、前記バリア駆動部材を前記バリア羽根の開き方向に付勢するとともに、前記バリア羽根の開閉に伴ってチャージ量が変化するバリア駆動ばねと、を備え、
前記バリア駆動ばねは、前記バリア羽根が全閉状態から全開状態に移動するときに、チャージ量が減少し、前記バリア羽根が全開状態から全閉状態に移動するときに、チャージ量が増加するレンズ鏡筒であって、
前記バリア駆動ばねは、前記バリア駆動部材における前記バリア駆動ばねの掛止位置と前記バリア羽根における前記バリア駆動ばねの掛止位置とを結ぶ方向に張力を発生させる引張りばねであり、前記バリア駆動部材における前記バリア駆動ばねの掛止位置と前記バリア羽根における前記バリア駆動ばねの掛止位置とを光軸方向にずらして配置し
前記バリア駆動ばねにより前記バリア羽根に作用する前記張力の作用線と前記バリア羽根の回転中心線との交点は、前記バリア羽根の回転平面と前記バリア羽根の回転中心線との交点と略一致する位置に配置されることを特徴とするレンズ鏡筒。
A pair of barrier blades that cover the photographing opening so as to be freely opened and closed, a barrier driving member that rotates the barrier blade in the opening and closing direction, and the barrier blade and the barrier driving member, respectively, A barrier driving spring that biases the opening direction of the barrier blade and changes the charge amount in accordance with opening and closing of the barrier blade,
The barrier driving spring is a lens in which the charge amount decreases when the barrier blade moves from the fully closed state to the fully open state, and the charge amount increases when the barrier blade moves from the fully open state to the fully closed state. A lens barrel,
The barrier drive spring is a tension spring that generates tension in a direction connecting a latch position of the barrier drive spring in the barrier drive member and a latch position of the barrier drive spring in the barrier blade, and the barrier drive member And the latching position of the barrier drive spring in the barrier blade and the latching position of the barrier drive spring in the barrier blade are shifted in the optical axis direction ,
The intersection of the line of tension acting on the barrier blade by the barrier drive spring and the rotation center line of the barrier blade substantially coincides with the intersection of the rotation plane of the barrier blade and the rotation center line of the barrier blade. A lens barrel that is arranged at a position .
前記バリア駆動部材における前記バリア駆動ばねの掛止位置を前記バリア羽根における前記バリア駆動ばねの掛止位置よりも像面側にずらして配置したことを特徴とする請求項1に記載のレンズ鏡筒。   2. The lens barrel according to claim 1, wherein a latching position of the barrier driving spring in the barrier driving member is arranged to be shifted to an image plane side from a latching position of the barrier driving spring in the barrier blade. . 前記バリア駆動ばねが掛止される前記バリア羽根のばね掛け部が、前記バリア羽根の回転中心に向かって鋭角に曲がって形成されていることを特徴とする請求項1又は2に記載のレンズ鏡筒。   3. The lens mirror according to claim 1, wherein a spring hooking portion of the barrier blade to which the barrier driving spring is hooked is bent at an acute angle toward the center of rotation of the barrier blade. Tube. 前記ばね掛け部は、基端側よりも先端側の幅が広く形成されていることを特徴とする請求項3に記載のレンズ鏡筒。   The lens barrel according to claim 3, wherein the spring hooking portion is formed so that a width on a distal end side is wider than that on a proximal end side. 前記バリア羽根は、回転中心に軸穴が設けられ、前記軸穴は、他の部材に設けられた回転軸に回転可能に支持されていることを特徴とする請求項1乃至4のいずれか1項に記載のレンズ鏡筒。   5. The barrier blade according to claim 1, wherein a shaft hole is provided at a rotation center, and the shaft hole is rotatably supported by a rotation shaft provided in another member. The lens barrel according to the item. 撮影位置と収納位置との間を光軸方向に移動して撮影倍率を変更するズーム機構を備えるレンズ鏡筒を有する撮像装置であって、An imaging apparatus having a lens barrel having a zoom mechanism that moves in a direction of an optical axis between an imaging position and a storage position to change an imaging magnification,
前記レンズ鏡筒は、請求項1乃至5のいずれか1項に記載のレンズ鏡筒であることを特徴とする撮像装置。The imaging apparatus according to claim 1, wherein the lens barrel is the lens barrel according to claim 1.
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