JP4047432B2 - Driving force switching mechanism - Google Patents

Driving force switching mechanism Download PDF

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JP4047432B2
JP4047432B2 JP36073197A JP36073197A JP4047432B2 JP 4047432 B2 JP4047432 B2 JP 4047432B2 JP 36073197 A JP36073197 A JP 36073197A JP 36073197 A JP36073197 A JP 36073197A JP 4047432 B2 JP4047432 B2 JP 4047432B2
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driving force
switching mechanism
shaft member
force switching
rotating
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JPH11190409A (en
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学 池田
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Olympus Corp
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Olympus Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、駆動力切換機構、詳しくは、カメラの駆動力切換機構に関する。
【0002】
【従来の技術】
従来、電動機によりカメラのフィルム巻き上げ並びにシャッタレリーズを撮影終了と同時に行い得るようにしたカメラ用自動巻上装置が実公昭41−25410号公報において開示されている。該カメラ用自動巻上装置は、フィルム巻取軸と、該巻取軸を駆動する駆動軸とを備え、これら駆動軸とフィルム巻取軸とは、いわゆるスリップクラッチ機構を介して係合する旨の記載がある。
【0003】
かかる公報に開示されたスリップクラッチ機構は、駆動軸に形成されたカム面と、フィルム巻取軸側の回動機構に設けられたクラッチピンとが当接する方向に付勢されて係合して構成されている。そして、フィルム巻き上げが終了した場合等、該スリップクラッチ機構に過負荷がかかると、スリップが生じることになる。
【0004】
【発明が解決しようとする課題】
しかしながら、上記実公昭41−25410号公報において開示されたスリップ機構では、上記駆動軸のカム面とクラッチピンとは常時当接するよう付勢されている。すなわち、常時、強力な付勢バネによる摩擦を介した係合がなされていることになる。このような摩擦による係合関係は実に不安定な要素を抱えており、安定したクラッチ機構を望むことは困難である。
【0005】
本発明はかかる問題点に鑑みてなされたものであり、小型で簡単な構成ながら、安定したクラッチ機構を実現した駆動力切換機構を提供することを目的とする。
【0006】
【課題を解決するための手段】
上記の目的を達成するために本発明の第1の駆動力切換機構は、駆動源からの駆動力を伝達する回動部材と、この回動部材の回動駆動力により、該回動部材と一体的に回動可能でかつ該回動部材に対して回動しつつスラスト方向に移動可能に設けられた軸部材と、この軸部材をスラスト方向に付勢する付勢手段と、上記軸部材の回動に連動して該軸部材のスラスト方向に移動可能に設けられた移動部材と、を具備し、上記移動部材の移動が阻止された際に、上記付勢手段の付勢力と反対方向に上記軸部材を移動させるようにしたことを特徴とする。
【0007】
上記の目的を達成するために本発明の第2の駆動力切換機構は、上記第1の駆動力切換機構において、上記軸部材は送りネジであり、上記移動部材は該送りネジと螺合する螺合部を有していることを特徴とする。
【0008】
上記の目的を達成するために本発明の第3の駆動力切換機構は、上記第1の駆動力切換機構において、上記回動部材と上記軸部材とは、該回動部材に形成されたキー溝と上記軸部材に形成されたキーとが嵌合により係合することを特徴とする。
【0009】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態を説明する。
【0010】
図1は、本発明の第1の実施形態である駆動力切換機構を適用するポップアップストロボ機構を備えるカメラの主要部構成を分解して示した説明図である。また、図2、図3は、当該駆動力切換機構の構成を上半分を断面で示した断面図であり、図2は、移動部材(送りナット)が通常の状態にあるとき、図3は、該移動部材が所定の位置規制部に当接した状態にあるときをそれぞれ示している。また、図4は、当該駆動力切換機構を適用するポップアップストロボ機構を備えるカメラの主要部を示した説明図である。
【0011】
図1に示すように、第1の実施形態の駆動力切換機構は、当該駆動力切換機構が適用される装置(ポップアップストロボ機構を備えるカメラ30)に配設されたモータ10等の駆動源により回動される回動ギヤー1と、この回動ギヤー1の回動駆動力により該回動ギヤー1と一体的に回動可能でかつ同回動ギヤー1に対して回動しつつスラスト方向に移動可能になされた送りネジ3と、この送りネジ3の一端側に配設され該送りネジ3をスラスト方向に付勢する圧縮バネ4と、上記送りネジ3と螺合し該送りネジ3の回動に連動して同送りネジ3のスラスト方向に移動可能に設けられ当該駆動力切換機構が適用されるカメラ30に配設されたポップアップストロボ機構20等と係合する送りナット2と、で構成されている。
【0012】
上記回動ギヤー1と送りネジ3とは、回動ギヤー1の中心部に形成された十字状のキー溝1aと、送りネジ3の他端側に形成されたキー3aとが嵌合することで係合する。すなわち、上記キー3aとキー溝1aとが嵌合することで、上記回動ギヤー1と送りネジ3とは一体的に回動することが可能となる。
【0013】
上記送りネジ3は、上述したようにその他端側で上記回動ギヤー1とキー3aで嵌合し、該回動ギヤー1の回動により一体的に回動するとともに、スラスト方向にも移動可能である。一方、送りネジ3の一端部と後述する軸受け部6との間には圧縮バネ4が配設されており、該送りネジ3を回動ギヤー1側に向けて付勢する。
【0014】
上記送りナット2は、送りネジ3に螺刻されたネジ部と螺合するよう配設され、該送りネジ3の回動に応じて同送りネジ3のスラスト方向に移動する。なお、図4に示すように、この送りナット2は、当該駆動力切換機構が適用されるカメラ30に配設されたポップアップストロボ機構20と公知の係止機構20aを介して係合するようになっている。
【0015】
また、図2に示すように、送りネジ3の両端部は、当該駆動力切換機構が適用されるカメラ30(図4参照)の本体に固定された軸受け部6、軸受け部5でそれぞれ支持される。この送りネジ3の一端部を支持する上記軸受け部6と該送りネジ3の一端部との間には、上述したように圧縮バネ4が配設されている。
【0016】
また、送りネジ3の他端部を支持する軸受け部5は、該送りネジ3の他端部を支持するとともに回動ギヤー1のスラスト方向の移動を規制する。すなわち、回動ギヤー1の軸受け部5本体側(図中、左側)への移動は、軸受け部5に形成された位置規制壁面5aで規制される。また、位置規制壁面5aからは回動ギヤー1の回動部を覆設するように位置規制部5bが延設されていて、これにより回動ギヤー1の軸受け部6本体側(図中、右側)への移動が該位置規制部5bの内壁面側で規制される。
【0017】
また、送りナット2は、上記位置規制部5bの外壁面と、軸受け部6の端面である位置規制壁面6aとで、その移動範囲が規制される。すなわち、送りナット2は、送りネジ3の移動に連動して該送りネジ3のスラスト方向に移動するが、その移動範囲は、位置規制部5bと位置規制壁面6aとの間に規制される(図2参照)。
次に、このように構成される本第1の実施形態の駆動力切換機構の作用について説明する。
【0018】
通常使用時には、回動ギヤー1がモータ10により回動駆動され、送りネジ3も該回動ギヤー1と一体的に回動する。このとき、送りナット2は、送りネジ3の移動に連動して上記移動範囲内で往復移動する(図2参照)。
【0019】
ここで、当該駆動力切換機構が適用されるカメラに何等かの異常が生じ、回動ギヤー1や送りナット2等を介して該駆動力切換機構に過負荷が生じた場合について考察する。
【0020】
いま、使用者の不注意等で当該カメラに何等かの異常、たとえば上記ポップアップストロボ機構20に何等かの異常が生じ、送りナット2が上記移動範囲の途中で移動不能状態に陥ったとする。
【0021】
この状態で上記モータ10の停止制御が適確になされず駆動が続いた場合、送りネジ3の回動に伴って、送りナット2が位置規制部5bに当接する(図3参照)。この後もなおモータ10が回動した場合、すなわち、当該駆動力切換機構にとっては過負荷が生じた場合、送りナット2は位置規制部5bの規制によりこれ以上の移動(図中、左方向への移動)が規制されるため、逆に送りネジ3が図中、右方向に、圧縮バネ4の付勢力に抗して(チャージして)移動する。
【0022】
送りネジ3においてこの動作が続くと、上記キー3aはキー溝1aより徐々に外れ、遂には離間する。すなわち、回動ギヤー1と送りネジ3とが離間する。これにより、もはや回動ギヤー1を駆動するモータ10の駆動力は送りネジ3には影響せず、他の部位への負荷は回避され、破損等を防止することができる。
【0023】
このように、本第1の実施形態の駆動力切換機構によると、送りネジ3の駆動力を利用してクラッチ用のバネ(圧縮バネ4)をチャージするので、このバネを小型化することができる。
【0024】
また、回動ギヤー1と送りネジ3との回動伝達係合をキーとキー溝との嵌合により構成したので、摩擦力を利用するスリップクラッチに比して確実な駆動を行い得るという効果を奏する。
【0025】
次に、本発明の第2の実施形態について説明する。
上記第1の実施形態の駆動力切換機構を適用するカメラにおいては、送りナット2と係合する機構がポップアップストロボ機構20であったが、本第2の実施形態においては、このポップアップストロボ機構20の代わりに撮影光学系が送りナット2と係合し、該撮影光学系の異常によっても上記第1の実施形態と同様の効果を奏することを特徴とする。
【0026】
図5は、本発明の第2の実施形態である駆動力切換機構を適用するカメラの主要部構成を分解して示した説明図であり、また、図6は、当該駆動力切換機構を適用するカメラの主要部を示した説明図である。なお、上記第1の実施形態と同様な構成要素には、同一の符号を付与し、ここでの詳しい説明は省略する。
【0027】
図5、図6に示すように、本第2の実施形態の駆動力切換機構を適用するカメラ40は、ポップアップストロボ機構20(図1参照)の代わりに撮影光学系50が送りナット2と係合する。
【0028】
そして、上記第1の実施形態と同様、撮影光学系50に何等かの異常、たとえば該撮影光学系50内のレンズ鏡筒の移動が阻止された場合等の異常が生じ、送りナット2が上記移動範囲の途中で移動不能状態に陥り、さらに、モータ10の停止制御が適確になされず駆動が続いた場合において、上記第1の実施形態と同様に、送りナット2は図4に示すように位置規制部5bの規制によりこれ以上の移動(図中、左方向への移動)が規制されるため、送りネジ3が図中、右方向に、圧縮バネ4の付勢力に抗して(チャージして)移動する。さらに、回動ギヤー1と送りネジ3とが離間する。
【0029】
このように、本第2の実施形態においても、上記第1の実施形態と同様の効果を奏する。
【0030】
[付記]
以上詳述した如き本発明の実施形態によれば、以下の如き構成を得ることができる。即ち、
(1) 駆動源からの駆動力を伝達する回動部材と、
この回動部材からの回動駆動力により、該回動部材と一体的に回動可能でかつ該回動部材に対して回動しつつスラスト方向に移動可能に設けられた軸部材と、
この軸部材をスラスト方向に付勢する付勢手段と、
上記軸部材の回動に連動して該軸部材のスラスト方向に移動可能に設けられた移動部材と、
この移動部材の移動位置を規制する規制手段と、
を具備し、
上記規制手段によって上記移動部材の移動が阻止された際に、上記付勢手段の付勢力と反対方向に上記軸部材を移動させるようにしたことを特徴とする駆動力切換機構。
【0031】
(2) 駆動源からの駆動力を伝達する回動部材と、
この回動部材からの回動駆動力により、該回動部材と一体的に回動可能でかつ該回動部材に対して回動しつつスラスト方向に移動可能に設けられた軸部材と、
この軸部材をスラスト方向に付勢する付勢手段と、
上記軸部材の回動に連動して該軸部材のスラスト方向に移動可能に設けられた移動部材と、
を具備し、
上記移動部材の移動が阻止された際に、上記付勢手段の付勢力と反対方向に上記軸部材を移動させるようにしたことを特徴とするカメラの駆動力切換機構。
【0032】
(3) 上記カメラは移動可能に配置されたストロボ装置を有していて、上記移動部材は該ストロボ装置を駆動する手段に連結されていることを特徴とする上記(2)に記載のカメラの駆動力切換機構。
【0033】
(4) 上記移動部材は、光軸方向に移動可能なレンズ鏡筒であることを特徴とする上記(2)に記載のカメラの駆動力切換機構。
【0034】
(5) ポップアップ位置と非ポップアップ位置とに移動するストロボ装置への駆動力を切換えることが可能なカメラの駆動力切換機構において、
駆動源からの駆動力を伝達する回動部材と、
この回動部材からの回動駆動力により、該回動部材と一体的に回動可能でかつ該回動部材に対して回動しつつスラスト方向に移動可能に設けられた軸部材と、
この軸部材をスラスト方向に付勢する付勢手段と、
上記軸部材の回動に連動して該軸部材のスラスト方向に移動可能に設けられた移動部材と、
を具備し、
上記移動部材の移動が阻止された際に、上記付勢手段の付勢力と反対方向に上記軸部材を移動させるようにしたことを特徴とするカメラの駆動力切換機構。
【0035】
(6) 上記ストロボ駆動手段は、
上記軸部材の回動に連動してスラスト方向に移動する移動部材と、
この移動部材の移動に連動して回動することにより上記ストロボ装置を駆動するストロボ装置駆動部材と、
を有していることを特徴とする(5)に記載のカメラの駆動力切換機構。
【0036】
(7) レンズ鏡筒の移動が阻止された際に、駆動源からの駆動力が該レンズ鏡筒に伝達されないようにしたカメラの駆動力切換機構であって、
上記駆動源からの駆動力を伝達する回動部材と、
この回動部材からの回動駆動力により、該回動部材と一体で回動可能でかつ該回動部材に対して回動しつつスラスト方向に移動可能に設けられた軸部材と、
この軸部材をスラスト方向に付勢する付勢手段と、
上記軸部材の回動に連動して該軸部材のスラスト方向に移動可能に設けられたレンズ鏡筒と、
を具備したことを特徴とするカメラの駆動力切換機構。
【0037】
【発明の効果】
以上説明したように本発明によれば、小型で簡単な構成ながら、安定したクラッチ機構を実現した駆動力切換機構を提供できる。
【図面の簡単な説明】
【図1】本発明の第1の実施形態である駆動力切換機構を適用するポップアップストロボ機構を備えるカメラの主要部構成を分解して示した説明図である。
【図2】上記第1の実施形態の駆動力切換機構において、移動部材(送りナット)が通常の状態にあるときの構成を上半分を断面で示した断面図である。
【図3】上記第1の実施形態の駆動力切換機構において、移動部材が所定の位置規制部に当接した状態にあるときの構成を上半分を断面で示した断面図である。
【図4】上記第1の実施形態の駆動力切換機構を適用するポップアップストロボ機構を備えるカメラの主要部を示した説明図である。
【図5】本発明の第2の実施形態である駆動力切換機構を適用するカメラの主要部構成を分解して示した説明図である。
【図6】上記第2の実施形態の駆動力切換機構を適用するカメラの主要部を示した説明図である。
【符号の説明】
1…回動ギヤー
2…送りナット
3…送りネジ
4…圧縮バネ
5…軸受け部
5a…位置規制壁面
5b…位置規制部
6…軸受け部
6a…位置規制壁面
10…モータ
20…ポップアップストロボ機構
30…カメラ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a driving force switching mechanism, and more particularly to a camera driving force switching mechanism.
[0002]
[Prior art]
Japanese Laid-Open Patent Publication No. 41-25410 discloses an automatic camera hoisting device that can wind a camera film and release a shutter with an electric motor simultaneously with the end of photographing. The camera automatic hoisting device includes a film take-up shaft and a drive shaft that drives the take-up shaft, and the drive shaft and the film take-up shaft are engaged via a so-called slip clutch mechanism. Is described.
[0003]
The slip clutch mechanism disclosed in this publication is configured to be urged and engaged in a direction in which a cam surface formed on a drive shaft and a clutch pin provided on a rotation mechanism on the film take-up shaft side abut. Has been. Then, when the film is completely wound up or the like, when the slip clutch mechanism is overloaded, slip occurs.
[0004]
[Problems to be solved by the invention]
However, in the slip mechanism disclosed in the Japanese Utility Model Publication No. 41-25410, the cam surface of the drive shaft and the clutch pin are always urged so as to contact each other. In other words, the engagement is always made through friction by a strong biasing spring. Such an engagement relationship by friction has a very unstable element, and it is difficult to desire a stable clutch mechanism.
[0005]
The present invention has been made in view of such problems, and an object of the present invention is to provide a driving force switching mechanism that realizes a stable clutch mechanism with a small and simple configuration.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a first driving force switching mechanism of the present invention includes a rotating member that transmits a driving force from a driving source, and the rotating member by the rotating driving force of the rotating member. A shaft member that can rotate integrally and can move in the thrust direction while rotating with respect to the rotation member, a biasing means that biases the shaft member in the thrust direction, and the shaft member A moving member provided to be movable in the thrust direction of the shaft member in conjunction with rotation of the shaft member, and when the movement of the moving member is blocked, the direction opposite to the biasing force of the biasing means Further, the shaft member is moved.
[0007]
In order to achieve the above object, according to a second driving force switching mechanism of the present invention, in the first driving force switching mechanism, the shaft member is a feed screw, and the moving member is screwed with the feed screw. It has a screwing part.
[0008]
In order to achieve the above object, a third driving force switching mechanism according to the present invention is characterized in that, in the first driving force switching mechanism, the rotating member and the shaft member are keys formed on the rotating member. The groove and the key formed on the shaft member are engaged by fitting.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
FIG. 1 is an explanatory view showing an exploded main part configuration of a camera including a pop-up strobe mechanism to which a driving force switching mechanism according to a first embodiment of the present invention is applied. 2 and 3 are cross-sectional views showing the structure of the driving force switching mechanism in the upper half. FIG. 2 shows a state where the moving member (feed nut) is in a normal state. , The movable member is in contact with a predetermined position restricting portion. FIG. 4 is an explanatory view showing a main part of a camera provided with a pop-up strobe mechanism to which the driving force switching mechanism is applied.
[0011]
As shown in FIG. 1, the driving force switching mechanism according to the first embodiment is driven by a driving source such as a motor 10 provided in a device to which the driving force switching mechanism is applied (a camera 30 having a pop-up strobe mechanism). The rotating gear 1 to be rotated and the rotation driving force of the rotating gear 1 can rotate integrally with the rotating gear 1 and rotate in the thrust direction while rotating with respect to the rotating gear 1. A feed screw 3 that is movable, a compression spring 4 that is disposed on one end side of the feed screw 3 and urges the feed screw 3 in the thrust direction, and is screwed into the feed screw 3 to engage the feed screw 3. A feed nut 2 that is provided so as to be movable in the thrust direction of the feed screw 3 in conjunction with the rotation, and that engages with a pop-up strobe mechanism 20 or the like disposed in a camera 30 to which the driving force switching mechanism is applied. It is configured.
[0012]
The rotary gear 1 and the feed screw 3 are fitted with a cross-shaped key groove 1 a formed at the center of the rotary gear 1 and a key 3 a formed on the other end side of the feed screw 3. Engage with. That is, the rotation gear 1 and the feed screw 3 can be integrally rotated by fitting the key 3a and the key groove 1a.
[0013]
As described above, the feed screw 3 is fitted with the rotary gear 1 and the key 3a on the other end side, and is rotated integrally by the rotation of the rotary gear 1 and is also movable in the thrust direction. It is. On the other hand, a compression spring 4 is disposed between one end of the feed screw 3 and a bearing 6 described later, and urges the feed screw 3 toward the rotating gear 1 side.
[0014]
The feed nut 2 is disposed so as to be screwed with a threaded portion threaded on the feed screw 3, and moves in the thrust direction of the feed screw 3 according to the rotation of the feed screw 3. As shown in FIG. 4, the feed nut 2 is engaged with a pop-up strobe mechanism 20 disposed in a camera 30 to which the driving force switching mechanism is applied via a known locking mechanism 20a. It has become.
[0015]
As shown in FIG. 2, both ends of the feed screw 3 are respectively supported by a bearing 6 and a bearing 5 fixed to the main body of a camera 30 (see FIG. 4) to which the driving force switching mechanism is applied. The As described above, the compression spring 4 is disposed between the bearing portion 6 that supports one end portion of the feed screw 3 and one end portion of the feed screw 3.
[0016]
The bearing 5 that supports the other end of the feed screw 3 supports the other end of the feed screw 3 and restricts the movement of the rotating gear 1 in the thrust direction. That is, the movement of the rotating gear 1 toward the bearing unit 5 main body side (left side in the figure) is regulated by the position regulating wall surface 5 a formed in the bearing unit 5. Further, a position restricting portion 5b is extended from the position restricting wall surface 5a so as to cover the rotating portion of the rotating gear 1, whereby the bearing portion 6 main body side of the rotating gear 1 (right side in the figure). ) Is restricted on the inner wall surface side of the position restricting portion 5b.
[0017]
The feed nut 2 is restricted in its movement range by the outer wall surface of the position restricting portion 5 b and the position restricting wall surface 6 a which is the end surface of the bearing portion 6. That is, the feed nut 2 moves in the thrust direction of the feed screw 3 in conjunction with the movement of the feed screw 3, but its movement range is restricted between the position restricting portion 5b and the position restricting wall surface 6a ( (See FIG. 2).
Next, the operation of the driving force switching mechanism of the first embodiment configured as described above will be described.
[0018]
During normal use, the rotational gear 1 is rotationally driven by the motor 10, and the feed screw 3 also rotates integrally with the rotational gear 1. At this time, the feed nut 2 reciprocates within the movement range in conjunction with the movement of the feed screw 3 (see FIG. 2).
[0019]
Here, a case is considered in which some abnormality occurs in the camera to which the driving force switching mechanism is applied, and the driving force switching mechanism is overloaded via the rotating gear 1, the feed nut 2, or the like.
[0020]
Now, it is assumed that some abnormality occurs in the camera due to carelessness of the user, for example, some abnormality occurs in the pop-up strobe mechanism 20, and the feed nut 2 falls into an immovable state in the middle of the movement range.
[0021]
In this state, when the stop control of the motor 10 is not properly performed and driving continues, the feed nut 2 comes into contact with the position restricting portion 5b as the feed screw 3 rotates (see FIG. 3). After this, when the motor 10 still rotates, that is, when an overload occurs in the driving force switching mechanism, the feed nut 2 is moved further by the restriction of the position restricting portion 5b (to the left in the figure). Therefore, the feed screw 3 moves against the urging force of the compression spring 4 (charged) in the right direction in the figure.
[0022]
When this operation continues in the feed screw 3, the key 3a is gradually detached from the key groove 1a and finally separated. That is, the rotation gear 1 and the feed screw 3 are separated from each other. As a result, the driving force of the motor 10 that drives the rotating gear 1 no longer affects the feed screw 3, and loads on other parts are avoided, so that damage or the like can be prevented.
[0023]
As described above, according to the driving force switching mechanism of the first embodiment, the clutch spring (compression spring 4) is charged using the driving force of the feed screw 3, so that the spring can be reduced in size. it can.
[0024]
Further, since the rotation transmission engagement between the rotation gear 1 and the feed screw 3 is configured by fitting the key and the key groove, it is possible to perform a reliable drive as compared with a slip clutch using a frictional force. Play.
[0025]
Next, a second embodiment of the present invention will be described.
In the camera to which the driving force switching mechanism of the first embodiment is applied, the mechanism that engages with the feed nut 2 is the pop-up strobe mechanism 20, but in the second embodiment, this pop-up strobe mechanism 20 is used. Instead of this, the photographic optical system is engaged with the feed nut 2, and the same effect as in the first embodiment can be obtained by an abnormality of the photographic optical system.
[0026]
FIG. 5 is an explanatory view showing an exploded configuration of a main part of a camera to which the driving force switching mechanism according to the second embodiment of the present invention is applied, and FIG. 6 is an application of the driving force switching mechanism. It is explanatory drawing which showed the principal part of the camera to do. In addition, the same code | symbol is provided to the component similar to the said 1st Embodiment, and detailed description here is abbreviate | omitted.
[0027]
As shown in FIGS. 5 and 6, in the camera 40 to which the driving force switching mechanism of the second embodiment is applied, the photographing optical system 50 is engaged with the feed nut 2 instead of the pop-up strobe mechanism 20 (see FIG. 1). Match.
[0028]
As in the first embodiment, some abnormality occurs in the photographic optical system 50, for example, when the movement of the lens barrel in the photographic optical system 50 is blocked, and the feed nut 2 is When the motor 10 is brought into an immovable state in the middle of the movement range, and further, the stop control of the motor 10 is not properly performed and the driving is continued, the feed nut 2 is as shown in FIG. 4 as in the first embodiment. Since the further movement (movement in the left direction in the figure) is restricted by the restriction of the position restricting portion 5b, the feed screw 3 resists the urging force of the compression spring 4 in the right direction in the figure ( Move (with charge). Further, the rotating gear 1 and the feed screw 3 are separated from each other.
[0029]
Thus, also in the second embodiment, the same effects as those of the first embodiment can be obtained.
[0030]
[Appendix]
According to the embodiment of the present invention as described in detail above, the following configuration can be obtained. That is,
(1) a rotating member that transmits a driving force from a driving source;
A shaft member provided so as to be able to rotate integrally with the rotating member and to move in the thrust direction while rotating with respect to the rotating member by the rotation driving force from the rotating member;
Biasing means for biasing the shaft member in the thrust direction;
A moving member provided to be movable in the thrust direction of the shaft member in conjunction with the rotation of the shaft member;
Restriction means for restricting the movement position of the moving member;
Comprising
A drive force switching mechanism characterized in that when the movement of the moving member is blocked by the restricting means, the shaft member is moved in a direction opposite to the urging force of the urging means.
[0031]
(2) a rotating member that transmits a driving force from a driving source;
A shaft member provided so as to be able to rotate integrally with the rotating member and to move in the thrust direction while rotating with respect to the rotating member by the rotation driving force from the rotating member;
Biasing means for biasing the shaft member in the thrust direction;
A moving member provided to be movable in the thrust direction of the shaft member in conjunction with the rotation of the shaft member;
Comprising
A driving force switching mechanism for a camera, wherein the shaft member is moved in a direction opposite to the urging force of the urging means when the movement of the moving member is blocked.
[0032]
(3) The camera according to (2), wherein the camera includes a strobe device that is movably disposed, and the moving member is coupled to a unit that drives the strobe device. Driving force switching mechanism.
[0033]
(4) The camera driving force switching mechanism according to (2), wherein the moving member is a lens barrel that is movable in an optical axis direction.
[0034]
(5) In a driving force switching mechanism of a camera capable of switching the driving force to a strobe device that moves between a pop-up position and a non-pop-up position,
A rotating member for transmitting a driving force from a driving source;
A shaft member provided so as to be able to rotate integrally with the rotating member and to move in the thrust direction while rotating with respect to the rotating member by the rotation driving force from the rotating member;
Biasing means for biasing the shaft member in the thrust direction;
A moving member provided to be movable in the thrust direction of the shaft member in conjunction with the rotation of the shaft member;
Comprising
A driving force switching mechanism for a camera, wherein the shaft member is moved in a direction opposite to the urging force of the urging means when the movement of the moving member is blocked.
[0035]
(6) The strobe driving means is
A moving member that moves in the thrust direction in conjunction with the rotation of the shaft member;
A strobe device driving member that drives the strobe device by rotating in conjunction with the movement of the moving member;
(6) The driving force switching mechanism for a camera according to (5).
[0036]
(7) A driving force switching mechanism for a camera that prevents the driving force from the driving source from being transmitted to the lens barrel when the movement of the lens barrel is blocked,
A rotating member for transmitting a driving force from the driving source;
A shaft member provided so as to be able to rotate integrally with the rotation member and to move in the thrust direction while rotating with respect to the rotation member by the rotation driving force from the rotation member;
Biasing means for biasing the shaft member in the thrust direction;
A lens barrel provided to be movable in the thrust direction of the shaft member in conjunction with the rotation of the shaft member;
A driving force switching mechanism for a camera.
[0037]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a driving force switching mechanism that realizes a stable clutch mechanism with a small and simple configuration.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an exploded main part configuration of a camera including a pop-up strobe mechanism to which a driving force switching mechanism according to a first embodiment of the present invention is applied.
FIG. 2 is a cross-sectional view showing the configuration of the upper half of the configuration when the moving member (feed nut) is in a normal state in the driving force switching mechanism of the first embodiment.
FIG. 3 is a cross-sectional view showing the configuration of the upper half in section in the driving force switching mechanism of the first embodiment when the moving member is in contact with a predetermined position restricting portion.
FIG. 4 is an explanatory diagram showing a main part of a camera provided with a pop-up strobe mechanism to which the driving force switching mechanism of the first embodiment is applied.
FIG. 5 is an explanatory diagram showing an exploded main part configuration of a camera to which a driving force switching mechanism according to a second embodiment of the present invention is applied.
FIG. 6 is an explanatory diagram showing a main part of a camera to which the driving force switching mechanism of the second embodiment is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Turning gear 2 ... Feed nut 3 ... Feed screw 4 ... Compression spring 5 ... Bearing part 5a ... Position control wall surface 5b ... Position control part 6 ... Bearing part 6a ... Position control wall surface 10 ... Motor 20 ... Pop-up strobe mechanism 30 ... camera

Claims (3)

駆動源からの駆動力を伝達する回動部材と、
この回動部材の回動駆動力により、該回動部材と一体的に回動可能でかつ該回動部材に対して回動しつつスラスト方向に移動可能に設けられた軸部材と、
この軸部材をスラスト方向に付勢する付勢手段と、
上記軸部材の回動に連動して該軸部材のスラスト方向に移動可能に設けられた移動部材と、
を具備し、
上記移動部材の移動が阻止された際に、上記付勢手段の付勢力と反対方向に上記軸部材を移動させるようにしたことを特徴とする駆動力切換機構。
A rotating member for transmitting a driving force from a driving source;
A shaft member provided so as to be able to rotate integrally with the rotating member and to move in the thrust direction while rotating with respect to the rotating member by the rotation driving force of the rotating member;
Biasing means for biasing the shaft member in the thrust direction;
A moving member provided to be movable in the thrust direction of the shaft member in conjunction with the rotation of the shaft member;
Comprising
A driving force switching mechanism characterized in that when the movement of the moving member is blocked, the shaft member is moved in a direction opposite to the urging force of the urging means.
上記軸部材は送りネジであり、上記移動部材は該送りネジと螺合する螺合部を有していることを特徴とする請求項1に記載の駆動力切換機構。The driving force switching mechanism according to claim 1, wherein the shaft member is a feed screw, and the moving member has a screwing portion that is screwed with the feed screw. 上記回動部材と上記軸部材とは、該回動部材に形成されたキー溝と上記軸部材に形成されたキーとが嵌合により係合することを特徴とする請求項1に記載の駆動力切換機構。2. The drive according to claim 1, wherein the rotation member and the shaft member are engaged with a key groove formed in the rotation member and a key formed in the shaft member by fitting. Force switching mechanism.
JP36073197A 1997-12-26 1997-12-26 Driving force switching mechanism Expired - Fee Related JP4047432B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP36073197A JP4047432B2 (en) 1997-12-26 1997-12-26 Driving force switching mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP36073197A JP4047432B2 (en) 1997-12-26 1997-12-26 Driving force switching mechanism

Publications (2)

Publication Number Publication Date
JPH11190409A JPH11190409A (en) 1999-07-13
JP4047432B2 true JP4047432B2 (en) 2008-02-13

Family

ID=18470677

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
JP (1) JP4047432B2 (en)

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Publication number Priority date Publication date Assignee Title
JP5532972B2 (en) * 2010-01-29 2014-06-25 株式会社寺岡精工 Labeling device

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